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Home My WebLink AboutCO 005 ii'.' , Conservation Order Cover Page XHVZE This page is required for administrative purposes in managing the scanning process. It marks the extent of scanning and identifies certain actions that have been taken. Please insure that it retains it's current location in this file. 005- Conservation Order Category Identifier Organizing (done) 0 Color items: 0 Grayscale items: 0 Poor Quality Originals: 0 Other: 0 Diskettes, No. OVERSIZED (Scannable with large plotter/scanner) ~. RES CAN DIGITAL DATA 0 Other, Noffype 0 Other items OVERSIZED (Not suitable for plotter/scanner, may work with 'log' scanner) 0 Logs of various kinds 0 Other NOTES: BY: ""-"""'-'.'" ."" /'~~ARIA DA TE3'- fJd-- fl3 TOTAL PAGES g). (p Isl ~ ~ Scanning Preparation BY: """"'Œ~ MARIA DATE:.t:=)-æ-Q3 IS/~ Production Scanning Stage 1 PAGE COUNT FROM SCANNED DOCUMENT: f) Co PAGE COUNT MATCHES NUMBER IN SCANNING PREPARATION: -1- YES _NO BY: ~~ MARIA DATE:5-¿;>7--Q3 IS/"R~ Stage 2 IF NO IN STAGE 1, PAGE(S) DISCREPANCIES WERE FOUND: _YES_NO BY: C~~ MARIA DATE: 5 - d 7 -65 ISì1:.~ (SCANNING IS COMPLETE AT THIS POINT UNLESS SPECIAL ATTENTION IS REQUIRED ON AN INDIVIDUAL PAGE BASIS DUE TO QUALITY, GRAYSCALE OR COLOR IMAGES) General Notes or Comments about this Document: 5/21/03 ConservOrdCvrPg.wpd STATE OF PJ.}ß KA DEPARTMENT OF NATURAL RESOURCES DIVISION OF MIIiæ AND MINERALS P.o. Ba,t 1391 Juneau, Alaalœ. RE : THE APPLICATIon OF THE STANDARD OIL COMPANY OF CALIFORNIA, WES'rERN OPERATIONS, INC. sa operator of the SWnson River F1elrl for an exception. to Section 2061.1 of the Alaska Oil and GuCons,e,rvation Regulation;, Title 11,AAC . IT APPEAR INO.Tm\T : ~ ORDER NO.5 November 25,1960 1 ,.The StandBrel Oil Cal1\PallY ofCalitorl1.ia, \ie:atern Operations, lUte. o.s Opel~at()r ot tnt S1mnfJøn í~1V'er ,Fial,d.... aul~d:t~ood e.r~q~$t" dA'tedNoveml>er 9, 1960, foI'an exc,ept1OD.. toseo't1o1,¡2061.1 of tbe Aluka 011 and Gas CQussrvat,1on R~~~la t ions ,Title 11 MC. ' 2. ,Notice ofhea:rr.tt1~ 011 th, pGt,i t1on wall p\.t"blißhed in 'bo'th AJ,1choJ:*$ae !'1:en... pape1't¡,OtJ. Novembex' 10,1960, pux.suutto seot:i,on .9. 6"c.bapter l.t,o,SLA 19,5;. 3. The hew.+iu¡ as he1.(l 1J~ the Ci'y Council Cb81tbers of th$Z.;1 ~ lou$,$ac Lib;¡:-.:ry ,AnchQ:t'a~, U.s. ,on November. 21 ~ 1960, nœnmexlcir~sa.t 10,: 00 A. Mil 4. All. tm,dej:~$:i(~!t,d.m$ltbe:r,1 of the cOtUmittee clesig11ated tobeEUtI oil~d gas petitions in Alaslœ were present II ,5. '!'eitimoll¡ 11l$~JOl"'t ot: '1;.heap¡>liea.t1on _s»resented and o¡PpOI""bWlity for OOUunêntor .further t!$s't!Jnøn;:f byinte:¡:~$.te~.¿t perøons was 81 wn" , , , , .A1nJ :crFURTDRAP1?EA1tINGtbat an, $xc~pt1ot~ to~;eot1on2061.1 0'1 tb$ AlASka Oil uð. G$s Cønøe:t'Vf.\t1or1 ~¡Ci)gu.lations peX'mi t.t1ng the 6va.ns'on Ri'\rerF1eld wøUs in themsm1oßk~1oM to bespac:ed on an aOaerepattertlX*ather thal), a 160 ~are pa:ttJern should be gra:nted on th$ (:¡.:counds of' 'theteclm1ca.l evidencesubm,iirtecl ahOWing J~ack of 1~$ê"oircQI1tinu1 ty , NO'W',T1I1fmØORE, .rf IS ORDERE.D that \lherejuGt,:1,f'ied 'by Nservoir development, 'ileUs_y be ,drilled. in aU pools of' thelIemloelt Zone wi tJ:l1n tbelimifts of the . Swanson River F1eld.on a. Spac.iI1.S patte.rn" of 80 acms per well..'l'his order is I, .made pursuant 'to ~leqti.o~'l :2061..3 of the Alat.Slæ. Oil and. Gas Conservation ReGUla.- tionsand$ hs.1J- Qont1nnein forcer or s. ;period of not more than (18) e ight$en luonths at the expiration of wb,1oh t;i.m.ea. l1cl\ring i,hall be he~d at Which Standa.rd OilCom¡')any ofCs.lif'o¡,.¡.i$ Western Operæ~tj.o:t:lS, Inc., may be :require"! to present such evidence as will el~ble the Division to detel~e the proper spacing for the Hemloclc Zone of the Swanson River Field. DONE at Jun~au and Anchora.jJe, Alaslœ.} and dated this of November) 1960. '. 28th day i, I' '. .', ...' . J.! 'I " ,." ,- ,. ., ". ",.' ,,-,', .-",,"-,..,,.'-, ..\""I~,o"~'\i. '""""",""I,C;.""'" " ,.,} 1.,...,'"""":'"",,,\,.,:.: , -" ~ ~';¡ Â * \~1.!Iiams, ~ì5"fi=eëtor Division of Mines and. Mirlel"als ~ ..,.-",' -,-'~-" ~"'" ¡f'~! ~r J!r ,""'-, ~: ..,"~, M. lL /, 1. ~, . . ";,'1 '.'.".. "".).." ""~..-~- "-"1" ~. I. ..'. ~'.'.'...'" ...' "',1&'" , .."",.\;>,:':' 1.Ò /1"1;:"'/)"'1 I/¡' ",.' e...," ...,..:1.. . (t.. .,C.".'..'.....:\~.. y,).. 4,': \fl"'/.,."'./.."...,(':.>.<".? 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"'¡ (,~.".,/",...,ti"C: ~';1 '-_.~. 'l ,';'.. ..... J"'<'~("o"" ¡:1J"c1( ¡ 1\ ~~"'1"'..t..,:>....."- ',......;>-':,¡;.I..I. J.\.:~" ....~ .....':..o¡;:¡ b 1.o0;;1,.L... v ,~)epartm$l1t of IAvrl' ;):.t." r:"+ ",,:.: ("'i:Cl t-torn'e..r ~' ~""_....,.."" )..\1 ..i (.... . ,,( . J (I \\ ( ( :¡ \, 'II ~I PUBLIC HEARING BY THE ALASKA OIL AND GAS CONSERVATION COMMITTEE OF THE DEPARTMENT OF NATURAL RESOURCES ON THE TEMPORARY 80 ACRE WELL SPACING PROVIDED FOR BY ORDER NO.5, NOVEMBER 25, 1960 FOR THE HEMLOCK - ZONE OF THE SWANSON RIVER FIELD, STANDARD OIL COMPANY OF CALIFORNIA, WESTERN OPERA- TIONS, INC., OPERATOR STATE OF ALASKA *************** -::¡:¡: COt1 ,--- V tt.~,;.", C(/_¿.~ ;z,t'- 5" Page 1 CO. #- g- ~. 'it TABLE 0 F CON TEN T S t Letter from Standard Oil Company of California read by Chairman Williams Test~ony by Mr. McFann~ Standard Oil Company of California Statement by Mr. Soyster, U.S.C.S. FOR THE APPLICANT: ( 1 and 2 4 and 5 ( EXHIBITS p.4 p.5 Page 2 p.3 p.4 p. 10 ( i~ ,,( ,I Page 3 PRO C E E DIN G S ----------- CHAIRMAN WILLIAMS: This hearing of course is called for the purpose of consideration of a request from Standard Oil Company of California to make per- manent a temporary well spacing order for the Swanson River Field. Bruce, Chief of the Petroleum Branch; Dick MUrphy, Petroleum Engineer; Mrs. Bobby We have present here on the Committee this morning, myself, Williams; Don Jo Brasch our stenographer; and Dick Bradley our legal counsel should be here but is not for some reason or other. Received from Standard We have on hand a letter which perhaps I should read. Oil, signed by Mr. Chatterton, dated April 18, stating as follows: 1IGentlemen: Standard Oil Company of California, Western Operations, Inc., hereinafter referred to as Standard, has operated for Richfield Oil Company, Union Oil Company, Ohio Oil Company J and itself in the Oil Company, Texaco and itself ( submits: Swanson River Unit; and as operator for Richfield in the Soldotna Creek Unit, herewith respectfi11y 1. By petition dated November 9, 1960 Standard requested a hearing for exception to Section 2061.1 of the Oil and Gas Conservation Regulations, Title 11, Alaska Administrative Code. 2. Such hearing was held on November-2l, 1960, and upon presentation of data justifying exception to the l60-acre well spacing requirement, your Conservation Commission issued Order No.5, dated November 25, 1960, which prescribed a temporary SO-acre spacing pattern where justified by reservoir development for wells drilled in Swanson River Field. 3. Order No.5 will expire on May 28, 1962. Now, therefore, pursuant to Section 2061.3 of the Oil and Gas Conservation Regulations, Title 11, Administrative Code, operator hereby respectfully requests that a hearing be held on April 30,1962, for the purpose of making said 80- acre well spacing order permanent. A memorandom presenting evidence indicating that this is the proper spacing for the Swanson River Field will be submitted by operator prior to the hearing. Very truly yours, Standard Oil Company of California, C. D. Chatterton." ( CHAIRMAN WILLIAMS: Mr. Chatterton, would you care to proceed? MR. CRA TTERTON : We will try to proceed. My name is Chatterton and I am District Superintendent for Alaska District for Standard Oil Company of California, Western Operations. ~ ,!, ,1 ~ Page 4 CHAIRMAN WILLIAMS: If you would care to sit, there is a chair there at the ,( j ,Il end of the table. MR. CHA'lTERTON: Will do. CHAIRMAN WILLIAMS: If you would rather, or if you would like to stand, it's quite all right. MR. CHATTERTON: Standard of California's Western Operations as operator for two units, the Swanson River Unit and the Soldotna Creek Unit, which comprise the productive l~its of the so-called Swanson River Oil Field, along with our partners, the Ohio Oil Company, the Richfield Oil Corporation, and the Union Oil Company of California, request that after this testimony and hearing that the Commission enter a spacing order that is permanent for the Swanson River Oil Field providing for the drilling of BO-acre locations. We have Mr. Don McFann of Standard Oil Company of California, Western Operations, who will present the testimony and the data. ( CHAIRMAN WILLIAMS: Thank you.Mr. McFann. MR . McF ann: My name is G. A. McFann. I'm a graduate petroleum engineer from the University of California. 1 have been employed by Standard Oil Company of California for eleven years as an engineer performing assignments in drilling, production and reservoir phases of the engineering group of the producing depart- mente My current assignment is reservoir engineer for the Alaska area. I would like to present five exhibits which are taped to the wall. Exhibit number's 1 and 2 are two structure maps (this being Exhibit 1; this being Exhibit 2). These are structure contour maps on a marker point which we call the H-4 point. These structure maps present our current interpretations of the structure of the Hemlock zone. Figure I shows only wells which were drilled on lOO-acre spacing. Figure 2 shows wells which are on lOO-acre, plus 80....160-acre plus SO-acre spacing. ( The color symbols as shown on the two structure maps - the red circles show wells which have been completed in the Hemlock zone. The orange coloring are locations ( (II Page 5 which were drilled to the Hemlock zone, and the Hemlock zone found nonproductive ~! of hydrocarbons and the location abandoned. The green locations are possible future productive locations within the Hemlock zone. Future production data may indicate these to be productive. Figure 3 is a typical induction electrical log thru the Hemlock zone of the Swanson River Field. This shows the sands which are productive in the Hemlock zone. The upper three sands are oil productive, pre- dominately in the Swanson River Unit, and north of Fault E, which is at this location, north of this point. All six sands are oil productive in the Soldotna Creek Unit, which is south of Fault E, with one exception. There is one well in Soldotna Creek Unit which is north of Fault E. Figures 4 and 5 on the structure sections are structural sections labeled A and B on the contour map - this being structure section "A" and this being structure section "B". Section "A" is the NS section for the entire length of the field. Structure section "B" is a NW-SE section through Soldotna Creek Unit. ( The Hemlock zone was discovered with the drilling and completion of Well 34-10 at this location during August, 1957. During 1958,1959 and 1960, development progressed in the Swanson River Unit of the field on a general spacing pattern of one well on l60-acre parcels. From the discovery of the field, through January, 1960, nine wells were drilleq which cut the portions of the Hemlock zone with the following results: Commercial producers, 4 wells; marginal producer, one well; abandoned location, nonproductive, four wells; for a total of nine wells. Of the nine wells drilled, four wells were nonproductive, which accounted for 44\% of the total number of wells drilled. The resulting percentage of abandonments indicated there to be a high degree of faulting and uncertainty of reservoir continutiy. In early 1960, Well SCU 41-4, this location, was drilled and completed off the l60-acre spacing pattern which has been set up in the Swanson River Unit. In April of 1960 the operator requested an exception to the established well spacing regulations to permit developing the Soldotna Creek Unit on the same 160-acre well spacing $uch ,a.: locations 12,14,32, and 34, which \ ;j ',I Page 6 were then being used in the Swanson River Unit. The Division of Mines and ,( Minerals granted this exception and Well 32-4 was then drilled in the Soldotna Creek Unit:. As of November 1, 1960,20 wells had been drilled, of which 14 were commercial, one was marginal, 5 were nonproductive, including Halbouty's Alaska King No.1 well. All well information and reservoir data obtained from these 20 wells and seismic data indicated evidence of faulting and stratigraphic variations which would result in inefficient oil depletion of the Hemlock zone on lGO-acre well spacing. Then on November 21, 1960, the Conservation Commission ordered that a temporary spacing of SO-acres per well be issued for a period of not more than IS months. As of March 1,1962, there has been drilled on 160-acre well spacing locations, 26 completed producers, 7 abandoned drillers, 2 drilling, and 5 possible future locations, bringing a total of 40 wells and locations, either drilled or possibly to be drilled on 160 acres per well location, a total number of 40. On the ( SO-acre per well location, this would be excluding the l60-acre locations which have already been drilled, there were 22 completed producers, I abandoned driller, none drilling, and 7 possible future locations, bringing the total to 30. The total number of wells then on both the 160-acre locations and SO-acre locations would be 48 completed producers, 8 abandoned drillers, 2 drilling."and 12 future locations, for a total number of 70 wells and possible locations within the Swanson River Field. As I mentioned previously, Figures 1 and 2 are our current interpretation of the Hemlock structure which contours on the market, point called the H-4 point. This H-4 point we are considering to be at the base of the orange sand; it's right in th~ middle of the productive interval. The Hemlock zone is divided into six productive intervals, as shown on the typical Induction Electric Logs. i \, Stratigraphically, there is fare correlation of these six major sand members throughout the Hemlock zone within the fieldo Present information, however, indicates the presence of numerous stratigraphic variations within various sand I( 1 Page 7 members in comprising the Hemlock zone. I would like to point a few of these ~ out. On our structure section, relative sands are colored in, so you can see that there is a considerable amount of sand lenticularity, sand lenting as indicated by some of these sands. We have several on points in the lower end of Soldotna Creek Unit. In the middle portion of Soldotna Creek Unit, we do have again a considerable amount of sand lenticularity in the upper sand members. Similar stratigraphic variations exist throughout the remainder of the Hemlock zone, which is not shown on these structure sections. Core analysis data obtained to date within the productive intervals indicates a very wide range of reservoir permeabilities ranging from less than one millidarcy to several darcies. Figures 4 and 5, also Figures 1 and 2, the contour maps, indicate the faults which we have established to date from available well controls. Evidence of faulting is furnished by well log correlations, results of production and ( fromation tests, data from core examinations, and core analyses, and analysis of Induction Electrical Log interpretations. Further support of the presence of faults and their effectiveness as fluid barriers lies in the variation of oil-water contacts amoung the various fault blocks. Evidence of faulting has been substantiated further by observed pressure differences which indicate the effectiveness of faulting as fluid barriers. I would like to point out several of the main faults.....Section D on the structure map running in this direction. Within the Soldotna Creek Unit we do have several faults of quite large magnitude, this being the one. The oil zone in this well is possibly completely displaced in the oil zone in the next surrounding wells. On the north-south section we come up from the extreme south end and have abandoned well, this location. We do again have several faults within the Soldotna Creek Unit. This one being of a fairly large magnitude. We have a quite large fault between the Soldotna and Swanson River Units at this ( location....again has a quite large degree of magnitude of several hundred feet. We do have faults as we go to the north end of Swanson River Unit. We have two , , Page 8 main faults at these two locations which are pressure barriers, we feel at this ii time are pressure barriers, and they are quite large of magnitude. There are other minor faults which are not represented. The reservoir fluid is a highly undersaturated crude oil with gas-oil ratios ranging from 150 to 400 cubic feet per barrel. Oil gravities range from 30 to 38 degrees API depending upon structural position. The current recovery mechanism displacing the produced oil is fluid expansion and to a lesser extent is water encrouchment. Calculations indicate the effectiveness of edge water encrouchment into the reservoir varies considerably with individual fault blocks. Reservoir pressures are declining as would be anticipated by the type of recovery mechanism and the present over-all spacing. No well pressure interference has been observed with the present well spacing and production rates. Conclusion: All well information and reservoir data indicat~evidence of ( faulting and stratigraphic variations which would result in ineffective depletion and ultimate loss in recoverable oil on l60-acre well spacing. 2. Danger of coning or drawing water into down-structure producing wells, espacially at high well producing rates with consequent reduction of well recoveries is always recognized. Eighty acre well spacing will permit more uniform withdrawals, a more even encroachment of edge water into the reservoir and consequently a greater ultimate oil recovery. 3. The present BO-acre well spacing appears, at least at the present, to be adequate to efficiently deplete the Hemlock zone. Further reservoir data may indicate a closer spacing, may ultimately result in the most efficient and greatest ultimate recovery of oil from the Hemlock zone of the Swanson River Field. Thank you. CHAIRMAN WILLIAMS: Do you have any questions? MR. BRUCE: I was looking at the contour map and the structure section, and ( between 21-3 and 14-34 there seems to be another fault there that doesn't seem to appear in your section. 1,1 \ Page 9 MR. McFANN: I think, Don, if you would notice on this, that either way you ;t go, whether you are in this fault, or you are in this fault block, this well falls in the same subsea depth in either fault block, and chances are you would not see a very large magnitude fault on the section. MR. WILLIAMS: Dick, do you have anything? MR. MURPHY: One thing. One that we have discussed is the cross section on Exhibit 2. After you reached Fault E,why did you come east and then go southwest? MR. McFann: If you have noticed on the section, every other well is l60-acre or an SO-acre well location and the sections were drawn up specifically for that purpose to go through alternate l60-acre and SO-acre locations which we got down to this point. Also, if you will look at the sand present in 21-3 is considerably different from the amount of sand present in 12T3, which we wanted to point out. That it was within two SO-acre well locations. There was quite a bit of difference ( in the amount of sand present in those locations. And we did want to come back up to this location to get back on to alternate l60-acre and SO-acre well locations. MR. MURPHY: I have another question. Does Standard plan in the future to run any pressure interference tests? MR. . McFANN : I would like a clarification of the question. What do you mean by pressure interference tests? MR. . MURP HY : Well, to shut one well in and produce another to show any draw- down in the shut-in well. MR. McFann: We do not plan this. We have found in any other location that this does not give any information. CHAIRMAN WILLIAMS: If anyone wishes to be heard from the floor, now open to comments or questions from anyone in the audience. MR. SWEET: 1 am John Sweet with Atlantic Refining Company. I'd like to know ( what geologic evidence the statement as made that the faults of large magnitude, " 1\ Page 10 and what specifically is the reservoir engineering data that indicates faulting. ", \~ I had numbers in mind. CHAIRMAN WILLIAMS: Would you answer that? MR. McFANN: I could answer part of that. On the reservoir data that indicates what reservoir factors you have to indicate faulting. On the structure sections we have indicated at the bottom the pressures within each fault block, and if you will examine those I think you will notice that there are in certain areas consider- able differences in the pressures as indicated. I think the other question was pertaining to geology. I'm not really qualified to testify as to the geological occurrences to magnitudes pertaining to whether there are large displacements or small displacements. We do have indicated there on some of those faults that there is just aboút a complete displacement between the H~lock sands that are productive in one way or another which would indicate a lack of sand discontinuity between one side of the fault and the other side. I don't know whether that ( answers your question. CHAIRMAN WILLIAMS: Do you care to add to that Mr. Chatterton? MR. CHATTERTON: No, there is nothing that I care to add to it. CHAIRMAN WILLIAMS: Mr. Sweet, would you like to have us call a brief recess here while you examine the exhibits? MR. SWEET: No. No thank you. CHAIRMAN WILLIAMS: Do you have any questions Mr. Soyster? MR. SOYSTER: Well, for U. S. Geological Survey, I'll say that we have followed this development quite closely, being right beneath Standard Oil Company's guns up there in the Cordova Building. We run upstairs every time we have a question. It is pretty easy to get an answer to it. As far as this hearing was concerned, I knew it was provisional when it was first granted, I never could see ( why, because if you had disapproved of it, I don't think you would have made them go back and make 160 acre spacing. The damage is all done, if there had been any damage. I think the benefits of 80 acre spacing are quite evident, in '~ ( Page 11 view of the structural conditions within that field. I will say for USGS and t the United States, the lessors, that 80 acre spacing is certainly satisfactory to us. CHAIRMAN WILLIAMS: Well, I had no personal hand in making up these particular regulations as pertaining to well spacing, but I imagine that there was some good reason for requiring that the first order be temporary and a follow-up hearing to make it permanent. I'm sure that the individuals that did make those up, they were made after public hearing, had good reason to do this. Is there anything further? Mr. Murphy. MR. MURPHY: Mr. Soyster, in answer to your questions whether the Commission might cause the operator to shut some of the wells in. I think Standard would have shut them in themselves long before they were drilled if they were not optional. MR. CHATTERTON: I think so too. ( MR. MURPHY: On this point of this temporary order in spacing, I think when these regulations were written they had in mind operations as independent's drilling shallow wells and I know you've had much more experience than probably all of us here in handling the independent drilling shallow wells and as you know and I know they will drill as close as they can get to get the 011 out as fast as possible disregarding the dissipation of the reservoir energy. I think that's what this was put in here for. MR. CHATTERTON: That might be. I know I started back in the early times when they drilled about 4 or 5 wells on one lot. CHAIRMAN WILLIAMS: Is there anything further from anyone? If there is nothing further then, we stand adjourned. ( Members of the Alaska Oil and Gas Conservation Committee present were: James A. Williams, Director, Division of Mines and Minerals; Donald D. Bruce, Chief, Petroleum Branch; and Richard V. Murphy, Petroleum Engineer. Attending the hearing were: Mr. C. V. Chatterton, Standard Oil CoQ of California Mr. J. M. Tasker, "If If Mr. R. Zierott, "" It iI, ( Mr. C. W. Hagans, Standard Oil Co. of California Mr. D. A. McFann II II " Mr. John M. Sweet, Atlantic Refining Company Mr. J. R. Wylie, Gulf Oil Co. of California Mr. M. H. Soyster, USGS Mr. W. J. Linton, USGS ja ( ( ,( Page 12 MINUTES FOR THE NOVEMBER 21, 1960 HEARING REQUESTED BY THE STANDARD OIL COMPANY OF CALIFORNIA, WESTERN OPERATIONS FOR EXCEPTION TO SECTION 206101 OF THE OIL AND GAS CONSERVATION REGULATIONS TITLE 11 AAC, FOR THE HEMLOCK ZONE OF THE SWANSON RI~~R FIELD On November 21, 1960 at 10:00 A.}1. in the Z. J. Loussac Library, Anchorage, Alaska, a public hearing was held at the petition of the Standard Oil Company of California, Western Operations, Inc., wherein they requested exception to Section 2061.1 pursuant to Section 2061.3, Title 11 Alaska Adminis- trative Code for the Swanson River Field, Kenai Peninsula, Alaska, and re- quested 80 acre spacing per well for the Hemlock Zone of said field where justified by reservoir development. Mr. James Ao \~illiams, Director of the Division of Mines and Minerals, Alaska Department of Natural Resources, and Chairman of the Oil and Gas Conservation Committee, opened the meeting by introducing the members of the Committee "'Tho \\Tere present: Mr. Phil Holdsworth, Commissioner of the Alaska Department of Natural Resources; Mr. Donald D. Bruce, Petroleum Geologist, Division of Mines , "" and Minerals; Mr. Richard V. Murphy, Petroleum Engineer, Division of Mines and Minerals, and Mr. Joe Rudd, State Department of Law. ~æ. Williams announced the Committee was ready to receive the presenta- tion from the Standard Oil Company in support of their petition for exception to well spacing requirements in the Oil and Gas Conservation Regulations and after such presentation any other interested person could be heard. Mr. vlilliams stated that the law requires the Department to render a decision within 30 days after the hearing \-¡hieb was being held after properly advertising in the news- papers ten days prior to the meeting. A copy of the legal notice was read by Mr. t~i11iams. Mr. Jack Crooker, District Superintendent for Standard Oil Company of California, ~~estern Operations made the introductory remarks for the request for exception to Section 2061.1 of the Alaska Oil and Gas Conservation Regulations. Mr. Crooker pointed out that Standard, as operator for both the S\vanson River and Soldotna Creek Units, was not asking for changes in the Regulations as there would be areas where 80 acre spacing would not be economically sound, but the 80 acre spacing Standard was requesting in this instance was necessary to properly drain the field and would result in greater economic recovery, a higher and more uniform rate of withdrawal, and \vould be beneficial to the State in increased revenues. He proclaimed that the other Swanson River Field working interest owners, Richfield, Union Oil Company of California and Ohio Oil Company had given the proposal a great deal of consideration and all concurred in the necessity for this reduced well spacing in the Swanson River Field. The request, said Mr. Crooker, that had been submitted to the Commission was of considerable detail as far as justification for 80 acre spacing 'tl1as concerned and -¡;.¡ould be presented by Hr. Tom Wyman. Nr. Crooker then introduced r-ir. ~vyman to the assembly. Mr. Wyman gave an oral presentation using the written petition sub- mitted to the Committee as an outline. (Copy attached) After completion of the presentation, Mr. Williams asked if there were any questions from the audience. Hr. Charles Barnes of the Alaska Scouting Service posed this question: "t'lould 40 acre spacing ever be suggested in the future?" Mr. ~Jyman replied that this could best be answered in the future, subject to the producing information which might justify closer spacing but felt that 80 acre spacing would be adequate at this time. However, he would not rule out the 40 acre possibility. Mr. Murphy clarified the answer to Mr. Barnes' question by stating that if, as a result of this hearing, the order were given for 80 acre spacing~ it would be a temporary one and within 18 months another hearing would be held for Standard to present further data showing that 80 acre well spacing tvas the proper spacing for the reservoir. He continued that the submittal, as presented by ~tt. Wyman, was standard submittal in other states and showed lack of reservoir continuity. If subsequent hearings showed the need for 40 acre spacing, then Standard or the State could request 40 acre spacing. "But, as Mr. Hyman pointed out, that remains to be seen," Mr. Murphy concluded. Mr. Williams announced that the material as presented ,vas tacked to the v1a11 for anyone to peruse and ,vas also available at the office of the Division of Mines and Minerals, 329 Second Avenue, Anchorage, for inspection. The meeting adjourned. Those attending the hearing were: Peggy McCollough w. E. ~.fuitney T. S. Wyman Jack Crooker Bill No'to7lan',' Jim Wylie Carl Jamison Jilayne Davison R. A. Saunders B. C~ Osborn G. y ~ ~fueat1ey A. L. Porter Arthur Gordon Berg Ruth Schmidt John Zehnder Don \V'. Buelow G. Ganopole Mrs. Bernard Sturgu1ewski Ross R. Gahring Clarence H. Unruh Locke Jacob T. S... Kelly Tom Atkinson Charles Barnes Ernie Bush Standard Oil of California " tr " II " " " " " Ohio Oil Company Gulf Oil Co. of California Humble Oil & Refining Co. 49th State Petroleum Report Pure Oil Company' Continental Oil Co. Superior Oil Co. . Anchorage Daily News U. S. Geological Survey " 11 " B. P. Exploration (Alaska Inc.) Phillips Petroleum Co. Texaco, Inc. Sinclair Oil & Gas Co. Sinclair Oil & Gas Co. Western Land & Leasing Co. Halbouty Alaska Oil Co. Alaska Scouting Service " fI " Hobil Oil Company ~ REQUEST FOR EXCEPTION TO SECTION 2061.1 of the Oil & Gas CONSERV A TION REGULATIONS TITLE 11 of THE ALASKA ADMINIST~ATIVE CODE SWANSON RIVER FIELD . , . - , ' l l (' ~'JELL SPACING m-lANSON RIVER FIELD 1. INTRODUCTION This memorandum reviews the justification for decreasing the well spacing within the Swanson River Field from the present 160 acres per well to 80 acres per well. The first well in the Swanson River Field was completed August 24, i957. Since that time, development of the Swanson River Unit has proceeded on the basis of drilling one well on each 160 acre parcel. In April, 1960, after drilling well Soldotna Creek Unit 41-4, the Standard Oil Company of California, as operator of the Soldotna Creek Unit, requested an exception to the well spacing regulatio ns to permit developing Soldotna Creek. Un! t on the same l60.acre well spacing pattern as was being used in the Swanson River Unit. Division of Mines and Minerals granted the exception and the development of the field has proceeded accordingly. 2. GENERAL The Hemlock sands within the Swanson River Field range from fine to medium grained well sorted sands to poorly sorted conglomerates. The porosity and: permeability of the sand and conglomerate intervals are frequently reduced by the presence of clays and silts. Interbedded coals and carbonaceous streaks within the Hemlock suggest that the depositional environment of the Hemlock was lacustrine or shallow lagoonal. The paucity of paleontological evidence further supports this conclusion. Stratigraphically there is fair correlat:io n of the major sand members of the Hem1:ock Zone wi thin the Swanson River Fielq.. Present information, however, indicates the presence of numerous stratigraphic variations within the various sands comprising the Hemlock Zone. (See Exhibit II) Available well information indicates that the structure is a relatively narrow, tightly folded, anticlinal feature. Seismic, stratigraphic, structural and reservoir data indicate the presence of numerous faults which di~ide the Swanson River Field into a series of productive fault blocks (see Exhibit I). Drilling to date has established a productive area approximately six miles long and one mile wide. The southern limit of the field has not yet been defined. In the course of field development 14 producing wells and five dry boles, including Halboutyl s Halasko-King No. 1 well, have been drilled. 3. lACK OF RESERVOIR CONTINUITY A. Faulting Exhibit I indicates the faults which have been established with avail- able wèll control. These faults have displacements ranging from approximately 100 to 500 feet and insofar as may be presently deter- mined are effective fluid barriers. I ': " .. ( ( , . - 2 - Evidence for faulting is furnished primarily by 1-lell log correlat:io nß~ Further support for the presence of faults and their effectiveness as fluid barriers in the Swanson River Field lies in the variation of 011- water contacts among the various fault blocks. In addition, stock tank oil gravities and produced gas-oil ratios range from 30.7° gravity and 116 standard cubic feet/stock tank barrel at the north end of the field to 37.1° gravity and 400 standard cubic feet/stock tank barrel at the south end of the field. It appears reasonable to assume that the presence of additional faulting will be established as field development proceeds and as the present well densi ty is increased. Such work will also allow presently recognized faulting to be more closely defined. In view of the apparent active water drive (see Section C. - Reservoir Drive), it is desirable that each fault block be penetrated at a structur- ally high position in order to assure maximum ultimate economic oil recovery from the block. Accordingly, a well density greater than one per quarter section appears desirable to more clearly define the fault pattern and to help, insofar as practicable, assure that each fault block is penetrated at a favorable structural position. ' B. Strati~hic Variations , , As previously indicated, stratigraphic variations exist within the Hemlock Zone. As may be s,een by Exhib;i.t II theH~:L~,and is developed in well SRU 34-10 and is not developed in well SRU 31...27. In addition, the shale break apparent in the H-2 to H-4 interval in well SRU 31-27 is absent in well SRU 34-10. Similar stratigraphic variations exist throughout the remainder of the Hemlock Zone. Core analyses obtained wi thin the productive interval indicate a wide range of reservoir permeabilities. Permeabilities ranging from less than one millidarcy to 3275 millidarcies have been measured. C. Reservoir Drive r The reservoir 1s highly undersaturated with a maximum gas-oil ratio of 400 cubic feet per barrel. Sufficient production has been withdrawn from two wells in the reservoir to indicate a water-oil ratio trend. The trend of the water-oil ratio of discovery well SRU 34-10 is shown in Exhibit III. To date the well has produced over 100,000 barrels of oil wi th only a 20 psi reduction in stat! c bottom-hole pressure. Similarly, the trend of the water-oil ratio of well SRU 31-27 is shown in Exhibit IV. An active edgewater reservoir drive is presently indicated in view of the increasing water-oil ratio trend of these two wells and also in view of the relatively constant bottom hole static pressure with continued production. The danger of coning or drawing water into downstructure producing we~ls, especially at high well producing rates, with consequent reduction of ultimate oil recovery is recognized. Closer well spacing will permit more uniform withdrawals, and consequently, a more even encroachment of , ' . . . . . ' , .. 10 (" ( '") - ..) - edgewaters into the reservoir may be effected. In this way, the possibility of bypassing pockets of oil is reduced and oil recovery is maximi zed. D. Well Interference No well interference has been observed with the present well spacing and production rates. An interference test was conducted between adjacent wells SRU 31-27 and 12-27 which are believed to be in the same fault block. The bottom hole static pressure was measured January 22, 1960, in well SRU 31-27 after it had been shut in 177 hours. The well was not produced and the static pressure was again obtained May 19, 1960, and found to be 7 psi higher than the earlier reading. During this same period, well SRU 12-27 produced approximately 42,000 barrels of reservoir fluid. Although it is recognized that well interference effects may be mini- mized by the presence of the active water drive, the above test does suggest that no well interference exists on the present 160 acre spacing. 4. CONCLUSIONS The following factors indicate the need for closer well spacing ~n the Swanson River Field. A. The numerous fault blocks which have been established with avail- able well control coupled with the active edgewater drive emphasizes the need for reducing the present 160 acre well spacing in order to assure maximum ultimate oil recovery. B. Stratigraphic variations within the Hemlock Zone suggest that 160 acre spacing is too great to assume penetration of and full oil recovery from the isolated permeable intervals and sand lenses which may be developed throughout the reservoir. C. The danger of drawing edgewater into the reservoir unevenly and consequently reducing the ultimate recovery may be minimized by reducing the well spacing and providing for more uniform encroachment of water into the reservoir. D. No well interference on 160 acre well spacing under normal pro- ducing conditions has been observed to date. 5. RECOMMENDATIONS Alter the well spacing within the Swanson River Field from 160 acres to 80 acres per well where justified by reservoir development. ~(,\( I'IÌ\. ~ ,.:) ":~-\\ r {,\'I\ T. S. WYMAN O/S W. E. Whitney J. T. Crooker ! ¡ r .... ;"' ( ~ O1HL ~ . ~mgl~t~, -,~~ ( ~ P. O. BOX 7-839 . ANCHORAGE . ALASKA PRODUCING DEPARTMENT TELEPHONE BR, 7-6201 J. T. CROOKER DISTRICT SUPERINTENDENT November 9 J 1960 STATE of ALASKA Department of' Natural Resources Pi vision o-r Mines and Minerals Petroleum Branch 329 2nd Avenue, Anchorage, Alaska. -Gentlemen; The STANDARD OIL COMPANY OF CALIFORNIA, Western Operations, Inc., as Operator tor Richfield Oil Company, Union Oil Company, Ohio 011 Com¡;>a.ny, and itself in the' Swanson River Unit and as Oþerator tor Riehf'ield Oil Company; Texaco, and itself in the Soldotna. Creek Unit proposes, where justified by reservoir development, to deifeloþ the Hemlock Zone, of the Swanson River Field to e. spacing of 80 acres per well. Approv$l to s"Ubmi t this proposal has been obtained from the part! c1pants who have conmd tted working interest in the Field area. in each ot the Units. The attaahedmemorandum reviews the justification for decreasing the well spacing within the Swan$ori River Field from the present 160 ß,~res per 'Well to 80 acres per well. Accorðingly 1 We hereby respectfully request a Hearing for Exception to Section 2061.1 pursuant to Section 2061.3 of the Oil and Gas Con$er~t1on Regulations, Title 11, Alaska Administrative Code. Ve'ry' truly yours, STANDARD OIL COMPANY OF CALIFORNIA Western Operations, Inc. ,...-_._~ ,j ." .'." k ...-".'-" (, i. '>':"'-""'" -"""-- . {.. ..- .--', d' ~ ~ ' - I .,~ ,/' 'i " ~,,' ~" I', "..., /.' /.,~~....~I_~.,'II.Å ~ ;Y./,r:lréRôó~:ä' '_.' l' .I<:"'~L--' Diatr1ci SUperintendent Alaska District ....,1..." ... 0 0 0 c Z :t \¡J II. '< II. ... '< u Z ! '- ~ .... ,.. Z 0:: Il. 0:: '< OJ ..J V Z 0 '< to ::> z Q OJ .... Z 0:: no IA ~ . c ~ C! Z oJ ;:) 0:: 0 ,.. '< 0:: en 11/ .J \) >- u X u z <"I M >- CQ (Ð z 2 en > ã 0 .. :r u Z It 111 Q. II! Z 0 <II > 0 0 .. It) .., u 0 z 0 ..) (t III a. « 0.. ,.. 2 !II: ø.. Q: « 1# ..J J , . ,'It " ( ( . FT+--~~¡ 'f . . . 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