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PETROVIETNAM KHAO SAT CO CHE DAY DAU KHI BOM EP POLYMER QUA M A U LOI 061 TUONG MIOCEN HA MO BACH HO TS Nguyen Hi i An Tdng cdng ty Tham dd Khai thdc Ddu khi ThS Nguyen Hoang Dufc, ThS Nguyen Bio Trun[.]
PETROVIETNAM KHAO SAT CO CHE DAY DAU KHI BOM EP POLYMER QUA M A U LOI 061 TUONG MIOCEN HA MO BACH HO TS Nguyen Hii An Tdng cdng ty Tham dd Khai thdc Ddu ThS Nguyen Hoang Dufc, ThS Nguyen Bio Trung Vien Ddu Viet Nam Tdm t i t Via chiira ddu Miocen hg md Bgch Hd dang Id ddi tuang nghiin edu cbinb cbo cdc phuang pbdp ndng cao hi sd thu hdi ddu bdng bam ip hda chdt nhUpolymer bay chdt hogt tinb be mat Nhdng nghiin cdu gdn ddy di cap din khd ndng tdng cUdng hi sdddy ddu bdng dung dieh polymer Ket qud thi nghiim bam ip dung djch co-polymer chiu nhiit vdi ndng dp cao qua mdu ldi Miocen bg md Bgch Hd cho thdy tdng luang ddu gia tdng thim dgt trung binh 12,1% so vdi sit dung phuang pbdp bam ip nUde HJ Hieu rd cdc ca chi day - quit si tgo diiu kiin thudn lai thiit keede sddd bam ip thuc techo ddi tUang nghiin cdu, bdi bdo gidi thiiu ede ket qud thi nghiim nhdm khdo sdt cbi tiet cdc cdche ddy ddu vd cdi thiin hi sd quit cua dung dich polymer qua mdu Idi Gidi t h i i u Cdng tie nghien cUu dinh g i i ning i p dung eie bidn phip ning cao he sd thu hdi dau duoe t i l n hinh tif diu nim 2000 eho eie ddi tUOng dang khai thie tai md Bach Hd.Trong dd, ddi tupng cit kit Mioeen dupe quan t i m nhieu nhat l i ddi tuong khai thie truyen thdng, cd the Ung dung k i t q u i nghidn eUu de ning cao he sd thu hdi dau Mdt sd phuong phap hda hpc (hoat tinh b l mat, dung mdi ) dupe bOm dp thU nghidm d i dem lai nhUng k i t q u i ban dau, song eung cho thay khd khin v i thich thUe i p dung cic phuong phap ning cao he sd thu hdi dau cho cac ddi tupng khai thic t^i md Bach Hd cOng nhutoin b l tram tieh Cifu Long Sau thdi gian d i i I p dung phuong phap bom dp polymer (tif nhifng nim 70 cua t h i ky XX), cic nghidn cifu cho thiy dung djeh polymer duoc bom vio via giup cii thiin ty sd dd linh ddng v i ning cao he sd quet Tuy nhiln, theo k i t q u i i p dung thuc t l tai mdt sd md thi dung djch polymer chi l i m t i n g nhe life day mao dan, luqmg diu khai thic thdm cd co c h l mao dan rat nhd so vdi d i u duoc polymer qudt md rdng dien tich theo ca di|n v l m i t c i t [3] cao qua mau Idi Mioeen md Bach Hd cho thay tdng lupng dau gia tang thdm dat trung binh 12,1% so vdi sd dung phuong phip bom dp nude [2] Tren eo sd kit qui tdng lupng thu hdi dau qua md hinh via phin ldp [1 ], mdt sd md hinh sifa ddi da thue hien tai Phdng Thi nghidm Cdng nghe md - Vidn Dau Viet Nam nhim ehi tilt hda tdng phin dau thu hdi.TU kit qui thuc nghiem, cie eo ehe day dau v i cii thidn he sd qudt cua dung djeh polymer dupe khio sit v i dinh gii hidu qui Hieu rd cic eO che day - quet se tao dieu kidn thuin loi thilt ke cie so dd bom dp thifc t l eho ddi tUOng nghien eUu Dung djch polymer bufc xa Dung djeh polymer (ed sd hidu mau A-806 Vidn Nghidn cifu Hat nhin tdng hop bing cdng nghe chilu 8,0 7,0 6,0 6,0 4,0 3,0 - 2,0 Trong nhifng nghidn cifu g i n diy, nhilu nhi khoa hpc d l 6i c i p d i n ning ting cUdng he sd day d i u cua dung djch polymer cd dd nhdt eao [3], [4] (dilu ehinh giim manh h i sd dd linh ddng M) Kit qui thi nghidm bom dp dung djch co-polymer chju nhidt vdi ndng dd 1.0 0.0 -ã-â$nhô(cP) TiudfclihitfAl 10 ngiy 6,8 6,85 30n9*y s 4.87 Hinh Kit qud khdo sdt dd ben nhiit dung dich polymer bdc A-806 [2] THAM DO - KHAI THAC D A U KHI bUe xa) ed mdt sd die tinh vUot trdi so vdi cie loai polymer khie bdi kha ning chiu nhidt dp eao tdi 130°C va ben mdi trudng nude cd dp khoing hda cao tuong duong nude bien Dung djch polymer A-806 cung dupe pha che tU nUde bien vdi dp mudi tUOng duong 25.000ppm Kit q u i khio sit dp b i n nhidt thdng qua gia tri dd nhdt eua dung djch (Hinh 1) cho thay dung djch tuong ddi dn djnh theo thdi gian vdi dd nhdt khoing 5eP tai dieu kidn via (nhiet dp 120°C va ap suit 20,4 MPa) Dac tinh tang chiifa Miocen md Bach Hd va hien trang khai thac Thin dau Mioeen md Bach Hd thude dang eit kit phin Idp mdng, xen ke vdi cic Idp bdt kit va set kit Trdn didn tieh md, thin diu dupe phin ehia thinh khdi rd ring (khdi Bie va khdi Trung tam) theo che dd thiiy ddng Lupng dau tai ehd eua khdi Trung tam la tridu tan va cua khdi Bic la 11 trieu tan Theo mat cit, thin dau gdm tang sin pham (tU tang 23 - 27) tang 23 l i tang sin pham chinh vdi chieu diy cd the dat tdi 20m mdt sd gieng khoan Od tham eua eie tang bien thien khoing rdng, tU vii mD tdi hang nghin mD (2 - 2.500mD ddi vdi tang 23) v i dd rdng trung binh dat 18% He sd phan ldp eiia eie tang tuong ddi cao (3,25 ddi vdi tang 23) [1] Od bio hda dau ban dau cua via cd gia trj trung binh 49% va ranh gidi dau nudc toan ddi tupng nim tai dd siu 2.971m Dau via thude loai ed ty trpng trung binh vdi gia tri trpng lupng ridng diu d i tach dat 865kg/m^ ty sd - dau tU lOOmVtan (khdi Trung tam) tdi MOmVtan (khdi Bie) Nhiet dd via trung binh tU 90 -110°C tuong Ung vdi chieu siu cic tang sin pham tU 2.760 - 3.000mTVDSS Ap suit via ban dau dupc liy vdi gia trj 28,8MPa Tinh den dau nam 2011, d i cd tren 60 gieng 6\jgc khoan vio via md Bach Hd Hidn cd 31 gieng khai thac v i gieng bom dp dang hoat ddng Phuong phip gaslift duoc i p dung cho hau het cac gid'ng khai thie Tdng lupng d i u d i khai thae dupe tU than dau dat 5,4 trieu tan, tuong Ung vdi he sd thu hdi 28,4% Ridng khdi Bie khai thie 3,8 tridu tan, dat 87% lupng dau ed the khai thie dupe Tuy nhidn, dp ngap nudc eua cac gieng rat cao (trdn 72%) Do dd, mdt luong Idn dau (Ude tinh khoing trdn tridu tan) cdn nim lai via sau qui trinh khai thae bing phuong phap bom dp nude va la tiem nang rat Idn cho eie phuong phap nang cao he sd thu hdi dau 24 DiUinri-so 4/2013 Thi nghiem bom ep polymer cho md hinh via phanIdp Mdhinh via phin Idp dupc eac ehuydn gia Vietsovpetro xiy dung tU4 nUa mau Idi tang ehUa Mioeen md Bach Hd Cie mau dupc lUa ehpn de ed hai nUa md hinh via ed dp tham khae biet nhau: tU 50 - lOOmD so vdi 900 hoic hing nghin mD Md hinh md phdng gin ehinh xie sif phan Idp bat ddng nhit tU nhidn thUe t l via ehUa, eho phep nghien cUu xie dinh hidn tUOng ddng chiy cheo xiy gida eie Idp qua trinh bOm dp nUde vi polymer Trong thUc te khai thie ddi tupng Mioeen ha, hidn tupng vpt nude sdm xiy d eie Idp ed dd tham Idn ed su hd tro ning luong tU nUdc bien va nUde bom dp i p dung tri i p suit via vdi ty sd dp linh ddng dupe dinh gii vao khoing M = The tfch ChSt liAi bom ip, VbomMfing Hinh Ketqud thi nghiim bam ip polymer [1] Hinh Bam ip polymer qua md hinh phdt PETROVIETNAM Thi nghidm bom dp polymer ning eao he sd thu hdi dau qua md hinh phin Idp tai dieu kien via, sd dung dau md phdng dp nhdt, nudc via va dung dich polymer A-806 ndng dp 2.500ppm Dung dich polymer dupc bom vio thdi diem md hinh via d i bj ngap nude hoan toan (sau ket thue bom day dau bdi nudc) The tich nut dung djch polymer bOm dp duoc lUa chpn bang 25% the tich khdng gian rdng eua md hinh Sau bom dp h i t luong polymer, nudc tiep tuc duoc bom vao md hinh nham thife hidn qua trinh bom di'y dau mdt each lien tue Ket qua khao sat co che day dau TU ket qua day dau ciia mau thU 8, nhdm tie gia da thuc hien khao sat chi tiet cae cO che day va quet dau cua nut polymer bang each sUa ddi md hinh va quy trinh bom day dau: day dau bdi dung djch polymer phan mau cd dp tha'm ldn sau da bom nUdc; day dau bdi dung dich polymer phan mau cd dp tham nhd sau da bom nude Ca md hinh ehi tiet deu dupe thUc hien tren ciing dieu kien thi nghidm (ap suit, nhiet dp va the tieh bdm day) Cae mau loi dupc lUa chpn vdi dp ddng nhat cao va dupc XLf ly het cha't luu (polymer, dau va nudc) he thdng 16 rdng sau bom dp Cong viec tai tao mau ve trang thai ban dau dupc thuc hien bang each ngam mau (da tao bao hda nUdc va dau ban dau) dau d nhiet dp cao, thdi gian tuan Phan mau Idi khdng md phdng se duoc lap dit cac nut die bang thep khdng cd dd rdng, dp tham.Tdc dp bom day nudc cung nhu nut polymer deu dupe thid't ke tUOng duong vdi dich chuyen 30 - 60cm/ (1 - feet/ngay) Cd md hinh via phan Idp d i dupc thuc hien, dd md hinh thue hien tai Phdng Thi nghiem eua Vietsovpetro va md hinh thUc hien tai Phdng Thi nghidm Cdng nghd md - Vien Dau Viet Nam Ket qua cho thay gia ting thu hdi dau thay ddi khoang 4,8 - 16,6%, trung binh dat 12,1% Theo bao cao kit qua nghien cUu [2] d i khang djnh mUe dp cii thien he sd quet dau anh hudng ddng chay cheo giUa eae Idp tiep giap va cd dp tham khac biet Idn (Hinh va 3) Trdn eo sd hpp tic nghidn eUu khoa hoe va kiem tra cheo gida cac phdng thi nghiem ve ning eao he sd thu hdi dau, Phdng Thi nghiem Cdng nghe md da thifc hien mau thU theo md hinh phan Idp Ke't qua cho thay lupng dau thu hdi bom dp nut polymer dat tdi 16,6%, ddng thii di'y them dau cung hoan toan thdng nha't vdi cac thi nghidm da thue hidn tai Vietsovpetro [1 ] Ket qua bom day Cl ca md hinh dupc trinh bay tren Hinh Md hinh via phan ldp Phong Thi nghiem Cdng nghe md - Vien Dau Viet Nam thUc hien cd tham Idn va he sd thu hdi dau tang them bom ep polymer dat gia tri eao nha't vdi 16,6% Mac dii he sd khac tuong ddi K^j/K^^jp = nhung he sd thu hdi dau cudi cung dat gan 70% va sau bOm dp nudc dat 52% Hai md hinh bom dp rieng Id cung eho he sd thu hdi dau rat cao bom ep nude va bom dp polymer Co c h l thu hdi dau bom dp polymer qua md hinh phin Idp dugc dinh gii la sU dieu ehinh hudng chay eua ddng nudc bom dp tU ddi cd dp tham cao Idn ddi cd dd thim thap, lam tang he sd quet dau bdi nUdc bom dp cd tic ddng eua nut polymer 80 chuyen ddng chim (Hinh 3) Tuy nhidn, phin tich so dd va quy 70 -A A k k k i r * k i trinh bom day eho thay ngoai cai 60 thidn he sd quet, nut polymer cd r _^ r > — y dd nhdt eao eung dupe day dan ^- 10 din ddi ed dp tham cao ^ 40 Nhu vay, nut polymer cung cd Bom n Jdc Bom ni/dc 30 ning day them dau ddi cd dd tham cao, tUc la cii thidn I :o jolymer h i sd di'y diu viing d i bi 0, 10 nude qudt qua Trong do, kit qui mdi ehi dUa tdng luong i; c diu thu hdi thdm sau bom dp, The tfch chat luu bam ep, V bam/Vrong ddng thii khai thie dau eung rat Hinh Kit qud bam ddy ddu cda cdc mdhinh bam ep polymer sda ddi khd phin tich chi tilt ^ f ^ - : • h^ if ^ ' y^ ' \ \ " THAM DO - KHAI THAC D A U KHi Ddng t h i i thu hdi d i u bom dp nUde eho thay phan mau ed dd tham Idn sd thu hdi dau nhanh hon va cao hon so vdi phan mau ed dp tham thap Ci md hinh bom dp ridng Id deu ehUng td mUe dp ddng nhat eao mau, nhidn mau ed dd tham nhd sd dat he sd thu hdi dau ehim hon Xdt trdn md hinh ghdp, ddng thai thu hdi dau bom dp nUdc eho thiy nUdc d i quet qua ei phan mau ed dp t h i m thap, ddng thdi lupng d i u thu hdi cdn ed su ddng gdp eua hidn tupng mao dan giUa phan dau eua phan tham thap v i phan nude d i qudt qua eua phin tham eao hon (Hinh 5).Tdng luong dau thu hdi sau bom dp nUdc eua eie md hinh ridng Id ed g i i trj eao hon so vdi md hinh ghdp, nhUng khdng nhilu Kit qui gia ting thu hdi dau bom dp polymer cua md hinh ridng Id chdng td phuong phip niy d i eii thidn ding ke he sd day diu he thdng Id rdng (E^,) Lupng diu gia ting thu hdi bom dp polymer eho md hinh dd tham Idn dat 7,6% v i eho md hinh dp tham nhd dat 10,4% Odng thii thu hdi dau cho thiy cie phan mau ridng Id da duoc polymer quet lai dat khoing 90% dien tieh m i nUde d i qudt, nhat l i ddi vdi md hinh phin mau cd dp tham Idn Tdng lupng dau thu hdi gia ting tU bom dp polymer eua md hinh ridng le dat khoang 18%, eao Bdt ddu qud trinh day polymer hon so vdi md hinh ghdp 1,4% v i the hidn tinh bit ddng nhat cua md hinh ghdp Gii trj ehdnh leeh 1,4% cho thay hidu qui qudt them eua nut polymer cho md hinh ghdp (vdi dd tham Idn) dat khdng cao so dd ddng chiy chdo khdng dat duoc hidu qua tdi da nhU cae md hinh ghdp ed dp tham thip hoic trung binh Trdn so dd bom day (Hinh 5), ddng chiy chdo chi qudt thdm phan didn tich nhd chUa dau dU eua phin ed dp tham thap, dd chu yiu qudt lai phan didn tich ma nudc d i qudt qua hoae mao dan d i Ily dau Ngoii ra, khoing cich gida nut polymer phan mau eung li yeu td inh hudng tdi hieu suit quet cua ddng chiy chdo Ddng thai khai thie dIu bOm dp polymer cua cic md hinh eho thay phan mau cing ddng nhat, mit phin cieh polymer - dau eing dn dinh va thdi gian nut polymer tdi giing khai thie sd lau hon nhieu so vdi md hinh ghdp ed tinh bat ddng nhat eao hon Loi t h i tdt nhit cQa via chUa ddng nhat i p dung bom dp polymer l i hd sd nude (w/ater cut) ddng sin pham cua giing khai thie sd giim nhanh, manh v i eung ting lai rit nhanh Ket luan Co chl day diu bing bom dp dung dieh polymer cho ning eao he sd thu hdi dau bao gdm cii thien hd sd qudt, Sau qud trinh ddy polymer Hinh Ca che day ddu cua polymer qua md hinh phdn ldp 26 oihi m l - S O 4/2013 PETROVIETNAM hd sd dp linh ddng v i he sd day dau Oe ap dung cho ddi tuong Miocen dudi md Bach Hd, dung djeh polymer can phii ed die tinh ben nhidt thdi gian d i i dieu kidn mdi trudng via ehUa Dung dieh polymer ed sd hieu A-806 cua Vien Nghien cdu Hat nhan (Oi Lat) cd the ap dung hidu qui eho ddi tupng nghien eUu He sd gia tang thu hdi dau qua mau Idi dat trdn 16% va ed the dat duoe thue t l i p dung vdi thdi gian ngin khdng phii thay ddi he thdng khai thie Bdn eanh do, can tiep tue nghien cUu: md phdng eie CO c h l v i phuong phap bom dp polymer trdn md hinh sd, phan tich ddng thai khai thae via v i hidn trang cic edng trinh bien, he thdng khai thae; tdi Uu the tich nut dung djeh polymer ddi vdi tUng gieng va cum giing; tdi Uu ndng dp dung djch polymer cho phii hop vdi tinh bat ddng nhat eCia viing via; tdi Uu thdi diem bom dp v i kiem soat nut dung dieh polymer nham phat huy hidu q u i qudt cheo giOa cie tang ed mUc dd bat ddng nhit eao Tai lieu tham khao Ld Oinh Lang va nhdm tie gia Mgt so nghiin cdu gia tdng thu hoi dau cho cde mo Bgch Ho vd mo Rong Tuyen t i p bao cao Hdi nghj Khoa hpe va Cdng nghd Qudc te"Dau Viet Nam 2010 -Tang tdc phat trien" 2010: p 937 - 948 Nguyen Hii An, Hd Anh Phong, fido cdo kit qud thCf nghiem bom ip polymer biin tinh bdc xg A-806 Luu trU Phdng Thi nghiem Cdng nghe md-Vidn Dau Viet Nam 2008 o Wang Demin, et al Study of the Mechanism of polymer solution with viseo-elastie behavior increasing microscopic oil displacement efficiency and the forming of steady "oil threat" flow chanels Paper No SPE 68723 SPE Asia Pacific Oil and Gas Conference and Exhibition April 17-19,2001 Yang Fuline, et al High concentration polymer flooding is successful Paper No SPE 88454, SPE Asia Pacific Oil and Gas Conference and Exhibition Oct 18 - 20,2004 Investigating the mechanism of oil displacement by polymer flooding through Bach Ho Lower Miocene core plugs Nguyen Hai An Petrovietnam Exploration Production Corporation Nguyen Hoang Due, Nguyen Bao Trung Vietnam Petroleum Institute Summary 77ie Bach Ho Lower Miocene reservoir is currently the main object for research on enhanced oil recovery (EOR) injecting chemicals such as polymer or surfactant solution Studies in recent years have mentioned the ability o polymer solution to enhance the displacement efficiency The results of experimental high-concentration heat-resistant co-polymer injection through core plugs from Bach Ho Lower Miocene reservoirs showed that t volume of oil displaced was increased by 12.1% as compared with water injection A better understanding of the displacement-sweep mechanism will facilitate the design of actual injection scheme for the study reservoirs T paper presents the results of experiments to examine in detail the displacement mechanisms and improve the swe efficiency ofpolymer solution ... VbomMfing Hinh Ketqud thi nghiim bam ip polymer [1] Hinh Bam ip polymer qua md hinh phdt PETROVIETNAM Thi nghidm bom dp polymer ning eao he sd thu hdi dau qua md hinh phin Idp tai dieu kien via,... U KHI bUe xa) ed mdt sd die tinh vUot trdi so vdi cie loai polymer khie bdi kha ning chiu nhidt dp eao tdi 130°C va ben mdi trudng nude cd dp khoing hda cao tuong duong nude bien Dung djch polymer. .. hinh Sau bom dp h i t luong polymer, nudc tiep tuc duoc bom vao md hinh nham thife hidn qua trinh bom di''y dau mdt each lien tue Ket qua khao sat co che day dau TU ket qua day dau ciia mau thU 8,