Hoi thdo khoa hoc "Ndng cao he so thu hoi ddu mo Bqch Ho" TlNH HlNH AP D U N G CAC BIEN PHAP NANG CAO Hf S6 THU H 6 | DAU KHf 6 M6 BACH H6, K^T QUA TRI^N VONG Tran Le Dong, Truong Cong Tai, Pham Anh T[.]
Hoi thdo khoa hoc "Ndng cao he so thu hoi ddu mo Bqch Ho" TlNH HlNH A P D U N G C A C BIEN PHAP N A N G CAO Hf S6 THU H | DAU KHf M6 BACH H6, K^T QUA - TRI^N VONG Tran Le Dong, Truong Cong Tai, Pham Anh Tuan XNLD Vietsovpetro ABSTRACT Greai attention have been paid in the Vietsovpetro to study the geological structure, reservoir and fluid characteristics for the purpose of approphate EOR selection at the Bach Ho field Simulation results have shown that the recovery factor at natural depletion regime is as low as in the range of 11-17% Based on comprehensive reservoir study results, the concept of field development by reservoir pressure maintenance had accepted in Vietsovpetro The lab study also showed that the water injection in the most effectiv method for pressure maintenance - the recovery factors by simulation results are 24.4% for Oligocene reservoi 28.7%o - for t^iocene reservoir and 37.6% for the basement resen/oir During the last years, several EOR techniques have been implemented in Vietsovpetro such as cyclic wate injection, injected water flow path study and well injection profile sun/eillance (by radioactive tracer), water shut-o (by cement bridge, gel composition, horizontal well drilling, reduction of well spacing) and microbiological inject (for Lower Miocene resen/oir) However due to the high resen/oir temperature conditions, the microbiological and thermal method as well as polymer injection are considered to be non-effective for the field The following techniques and solutions are considered to be implemented: Constant production & injection adjustment, Optimization of well production I injection rates Upgrading of resen/oir model, Personnel training on EOR techniques, Application of new EOR technologies, Rational organization and intergrated management of EOR projects Tim toi va ap dung cac giai phap nang cao he so thu hoi dau la mot nhi/ng hudng hoat dong quan hang dau, di/dc lanh dao xi nghiep thi/ang xuyen lanh dao, chi dao, la chuang trinh nghien cCru lien tuc nhieu nam qua cua cac can bp khoa hoc Vien NIPI, cac ca so cua Vietsovpetro va cung dugc SLf quan tam h5 tra, hgp tac nghien ciru cua cac ca quan thuoc Petrovietnam, cac vien, cac triidng dai hoc a nirdc, cua cac cong ty dau nude ngoai NhQng ket qua dat dirge cue Vietsovpetro Unh vtrc c6 y nghTa Idn ca ve khoa hoc, ca ve kinh te ky thuat va vi vay la nhOng ket qua rat dang tran Tiem nang thu hoi trix lugng dau cua Vietsovpetro kha Idn Nhung thach thuc doi vdi cac nha hoach dinh chien luge dau Viet Nam, cac can bp khoa hoc ky thuat, cac nha quan ly nham khong ngUng nang cao he so thu hoi dau cho mo Bach Ho dang a phia trugc: Ca ve tiem luc tri tue, tien bp khoa hoc - cong nghe va ca ve to chUc trien khai De tim dugc va ap dung cong cac giai phap nang cao he so thu hoi dau, dieu dau tien la phai nam dugc chac chan cac dac trung ve cau true moi trudng chua dau va cac tinh chat ly hoa nhiet thuy dong cua chat luu bao hoa thong qua viec nghien cuu xac dinh cac thong so cua chung Thieu thong tin khong cho phep ap dung cac cong nghe vai muc dich nang cao he so thu hoi dau Trong han 20 nam qua, Vietsovpetro da Hoi thdo khoa hoc "Ndng cao he so thu hoi dau mo Bach Ho' trien khai mot khoi luang lan cac cong viec nghien cuu dia chat - dia vat ly, da thu duac mot luang thong tin lan, phong phu Chinh tren ca sa ma cac doi tugng khai thac cua Vietsovpetro deu da dugc thiet ke va trien khai khai thac theo che dp c6 giu ap suat via bang each bam ep nuac bien vao via vai cac he thong mang lugi gieng tuang thich cho tUng doi tuang khai thac Cac phuang an khai thac theo che tu nhien cho cac doi tugng Mioxen, Olioxen va mong cua Bach Hd chi dat dugc he so thu hoi dau tu 11 den 17% Cac phuang an khai thac CO bam ep nuac giu ap suat via theo tinh toan du bao c6 the dat duac he so thu hoi dau tU 24.4% (cho Oligoxen); 28.7% (cho Mioxen) va 37.6% (cho mong) Nhu vay so vdi phuang an khai thac b§ng che dp tu nhien, phuang an khai thac c6 bam ep nude dat he so thu hoi dau gap lan, Chinh vi nhiet dp via cao cua cac doi tugng (>115°C), nen cac phuang phap hoa hoc, vi sinh, chua phai la phuang phap hien thuc de nang cao he so thu hoi dau Su khan hiem nguon cung cap khi, chi phi cao va su han che ve dieu kien trien khai cac may nen cong suat Idn d tren cac gian c6 dinh da khdng cho phep bam ep vao via nhu mot cong nghe hien thuc nham nang cao he so thu hoi dau cho mo Bach Hd, Cac nghien cUu dia chat - dia vat ly, nhiet thuy dong luc cung da cung cap thdng tin quy bau cho viec xay dung cac md hinh so thuy dong luc - md hinh toan thuy ddng hay dan gian han la xay dung md hinh khai thac Lua chpn phuang phap bam ep nude vao via nhu da neu d tren ehi la mot quyet dinh cong nghe mang tinh dinh hudng; he so thu hdi dau dat dugc gia tri nao edn phu thudc vao kha nang quan ly, kiem soat qua trinh khai thac, trien khai eae giai phap de dieu khien qua trinh dd den mUe dp nao Dieu ed quan he tdi muc dp (dp tinh, dp nhay, dp tin cay ) cua md hinh khai thac Vdi md hinh thd, dl nhien dp nhay se yeu va dp tin cay khdng cao De ed dp tinh dat yeu cau, du nhay va dam bao dp tin cay ddi hoi mo hinh khai thac dugc xay dung tren cd sd xir ly, phan tich, minh giai tat ca cac yeu to dia chat - dia vat ly va cac yeu td edng nghe cd ban va thudng xuyen duac bd sung, cap nhat chinh xac hda theo tai lieu khoan gieng mdi, nghien cuu thuy ddng luc va sd lieu lich su khai thac Rd rang la, de cd md hinh khai thac tdt ddi hoi dau tu rat Idn cho nghien cUu dia chat chuyen sau, eae nghien cuu tren miu Idi, mau lat mong ve thach hpc, tudng da, thuy ddng luc; dau tu Idn cho xu ly minh giai dia chan chieu, cho phan tich, minh giai tai lieu dia vat ly gieng khoan xac dinh cac thdng sd tham chira, kiem tra khai thac (dac biet ddi vdi tang mong nut ne, hang hde); dau tu Idn cho viec tao lap eae bd ehuang trinh (phan mem) chuyen dung; dau tu xay dung td hgp thiet bi may mdc ddng bp, du manh, ddng thdi dau tu dao tao dpi ngu chuyen vien ky thuat du kha nang khai thac hieu qua cac phan mem va thiet bi hien dai Theo nhung hudng dd, han 10 nam qua (1992 - 2001) Vietsovpetro da trien khai mot loat ehuang trinh nghien cuu bang luc lugng cua minh, hgp tac vgi cac ddi tac va thue ben ngoai lam Dudi day liet ke nhung nghien cUu quan trpng nhat da dugc tien hanh phuc vu xay dung md hinh khai thac mo va ca sd vat chat ky thuat da tao dung dugc: - Xu ly, minh giai 4842 km tuyen tuyen dia chan 3D theo phuang phap dich chuyen theo chieu sau c6 ap dung cac thudc tinh dia chain, phan tich tudng dia chain Da minh giai lai dugc toan bp ranh gidi dia chan (SH5; SH7; SH8; SH10; SH11; SH12 va mat mdng), Xu ly lai 4842 km dia chan 3D theo phuang phap dich chuyen theo chieu sau - Khoan va cac td hap dia vat ly gieng khoan han 150 gieng (trong dd ed 25 gieng ed va minh giai FMC/FMI) - Tien hanh han 200 lan khao sat tdng hgp nhiet thuy ddng luc gieng khoan, 240 dudng hdi phuc ap suat, 142 mat cat ddng, 1700 lan ap suat via cac gieng - Hang ngan mau phan tich, xac dinh dp rdng, dp tham, dp tham pha, he sd day dau, thach hpc tram tich - Phan tich toan dien PVT: 225 mau d 75 gieng, - Bd'n lan thu nghiem chat danh dau de nghien cuu hudng va tdc dp van ddng cua chat luu via, - Ba lan tinh va tinh lai tru luang dau va hda tan (1992, 1997 va 2002), - Hai lan thiet lap sadd edng nghe va saddedng nghe hieu chinh (1993 va 1998) Hdi thdo khoa hoc "Ndng cao he so thu hdi ddu mo Bqch Ho" - Cac bao cao dinh ky (hang quy, hang nam) ve giam sat ban quyen thuc hien sa dd edng nghe - Bao cao "Xu ly va phat trien thdng tin ve dp tham" (1997) - Bao cao "Nghien cUu anh hudng cua nhip dp khai thac dau tang mdng ddi vdi he sdthu hoi dau" (2001), - Xu ly vung can day: 322 lan (trong dd xu ly a xit 120, gay vd thuy luc 30) - Thu nghiem tang thu hdi dau bang phuc hgp vi sinh, - Nghien cuu hudng van ddng chat luu bang quy luat thay ddi phan vi nguyen td, - Nghien cuu du bao kha nang ngap nude bang quy luat thay ddi phan hda ly cua dau qua trinh khai thac - Da ed tram xu ly thdng tin hien dai vdi nhieu phan mem chuyen dung (GEOFRAME, ROXAR, CMG, FINDER,,.) va 11 may tinh cd dung lugng d cung den 300Gb - Cac chuyen nganh deu cd cac phan mem tien tien: (PANSYSTEM, OIL TEST, ROXAR, ELANPLUS, BASROC, eae phan mem cua CMG, FINDER - Hang tram may tinh the he mgi, - Da trien khai cac bugc cd ban de xay dung ca sd du lieu dia chat khai thac cua XNLD Vietsovpetro, ehuang trinh cho phep luu tru toan bp cac sd lieu dia chat - khai thac (dia chat, khoan, carota, cac loai ban dd, sd lieu khai thac ), Ca sd dU lieu dia chat - khai thac dugc thiet ke dam bao tuang thich tdi da vdi cac phan mem hien ed tai XNLD tao mot he thdng thdng nhat lien hoan dam bao dp tin cay cao va nhanh chdng - Han 10 nam qua, thdng qua thuc tien san xuat, thdng qua cac khda dao tao chuyen nganh, cac dgt edng tac tiep can edng nghe mdi, thdng qua hgp tac nghien cUu, thu nghiem, ap dung cac giai phap nang cao he sd thu hdi dau vdi eae dan vi nghien eUu khoa hpc nude, eae hang dau qudc te, da dao tao dugc mot dpi ngu can bp ky thuat tuang ddi day du ve sd lugng va bugc dau trien khai dugc mot sd ndi dung lien quan tdi nang cao he sd thu hoi dau Cd the ndi rang, han 10 nam qua, tai XNLD da trien khai cac nghien cuu vdi khdi lugng Idn, cd sd vat chat ky thuat dugc tao dung la dang ke va da dao tao dugc mot dpi ngu can bp ky thuat ddng ve sd lugng, cd kha nang tiep thu va ap dung cac edng nghe mdi nang cao he sd thu hdi dau Tuy vay de then khai edng cac giai phap nang cao he sd thu hdi dau cho eae ddi tugng md Bach Hd, dac biet ddi vdi tang mdng thi nhung nghien cUu vin edn it di, chua ddng bd; eae phan mem chuyen dung de lua chpn edng nghe tuang thich thi hau nhu chua ed; thu nghiem phdng thi nghiem edn han che; md phong qua trinh bang cac phan mem mdi dUng d muc dp danh gia mot sd yeu td tuang tac, chua bao quat het toan bd qua trinh giup xac dinh hieu qua kinh te ky thuat cua edng nghe; eae thu nghiem tren md phan Idn la cac giai phap xu ly vung can day gieng va cac giai phap dieu chinh qua thnh khai thac dau va bam ep nude Nhd cac ca sd vat chat ky thuat da tao lap dugc, ket qua cua cac edng trinh nghien cuu ma md hinh khai thac cac ddi tugng cang dugc chinh xac hda, nang cao kha nang du bao va lua chpn eae giai phap nang cao he sd thu hdi dau Chung tdi lay vi du tang mdng md Bach Hd de lam sang td y nghIa quan trpng cua viec xay dung, hoan thien md hinh khai thac ddi vdi he sdthu hdi dau Than dau tang mdng dugc phat hien lan dau tien - nam 1985 d gieng BH6, dugc tham dinh lai bdi gieng sd tren gian MSP1, nam 1988 dugc dua vao khai thac, Su kien md dau cho mot giai doan mdi phat trien md Bach Hd vdi quy md mot md Idn khu vuc Nhung nam dau tien, muc dp nghien cuu chua sau nen than dau dugc xep vao loai "md phong hda", chieu cao khdng Idn va dien tich han che, phuang an khai thac luc dau theo che dp nang lugng tu nhien, vgi he sd thu hoi dau tinh toan dat khoang 17%, vdi tdng san lugng du Hoi thdo khoa hoc "Ndng cao he sdthu hoi ddu mo Bqch Ho" bao 25 trieu tan dau Md hinh khai thac theo che dp ed giu ap suat via d thdi diem dd dugc xay dung rat ddn gian va vi vay da du bao sal lech kha nhieu so vdi thuc te [1] Theo md hinh nay, sau bdm 30 trieu met khdi nude vao via va thu hdi 30 theu tan dau thi phan tram nude san pham len den 52.5% Trong cung thdi gian dd, thuc te da thu hdi dugc 41 trieu tan dau va bam vao vi'a cung khdi lugng 30 trieu met khdi nhung phan tram nude san pham ehi la 0.7% Cung tuang tu nhu vay, md hinh khai thac ddi sd dd edng nghe khai thac -1993 [2] vdi he thdng cac gieng thaing dirng, chap nhan che dp tach cue bp, cac thdng sd cua md hinh edn mang tinh gia dinh Tdng san lugng khai thac dau tU tang mdng du kien la 78 trieu tan vdi he sd thu hdi dau dat dugc 22.3% Rd rang md hinh khai thac sa edng nghe - 1993 chua phan anh dugc qua trinh khai thac dau, eae giai phap dua (chap nhan ddi mu thu sinh, sa dd ddi, he thdng gieng thing dCrng ) da khdng cho phep dat he sd thu hdi dau cao Dua tren nhung qua nghien ciru dat dugc giai doan 1990 -1995, md hinh dia chat tang mdng md Bach Hd tUng bude dugc chinh xac hda, ca ve quy md cua than dau, cau true ben trong, eae thdng sd tham ehCra cua coleeto va tinh chat hda ly cua chat luu Tren ca sd dd md hinh khai thac cung dugc hieu chinh dan Trong sa edng nghe hieu chinh -1998 [3] sa dd khai thac tang mdng da cd nhung cai ddi dang ke so vdi sa ddnam 1993: - Dam bao giu ap suat via cao hdn ap suat bao hda 10-15 atm, cd nghla la than dau se khdng xuat hien ddi mu thu sinh - Bdm ep nude vao ddi sau cua than dau (thap han chieu sau -4000m), thay vi bam tCr -3850m nhu sd dd edng nghe -1993 - Sd dd ddi dugc thay the bang sd dd ddi - He thdng gieng khoan mdi chij yeu cd than a ngang dinh hudng thing gdc vdi phudng phat trien cua cac ddi dap vd dut gay kien tao gay Thuc te khai thac md nam gan day (1998 - 2001) da xac nhan tinh dung dan ve khoa hpc va hieu qua kinh te ky thuat cua nhung cai ddi da neu tren va ed ca sd de ndi rang he sd thu hdi dau se dat dugc muc cao nhu da bien luan sa dd edng nghe hieu chinh -1998 Neu nhu giai doan dau (1993-1995) 20 gieng khoan thing dung de bdm ep nude chi cd gieng dat yeu cau (trong sd nay, khoang bam ep trung binh cao han -4000m), quy gieng bam ep thieu hut nghiem trpng, khdi lugng bam ep khdng bu du khai thac dau, ap suat via suy giam va vi the da phai giam san lugng khai thac dau tang mdng nam 1995 Giai doan 1995-2000 da khoan 15 gieng bam ep cd than a ngang dinh hudng thang gdc vdi phuang phat then cac ddi dap vd, cd 14 sd 15 gieng dat yeu cau (mot gieng - gieng 485 - khdng dat yeu cau cd the hoan thien gieng khdng dam bao vi qua trinh khoan da xac nhan rat nhieu khoang d sau mat dung dich Idn), cac gieng deu dam bao chieu sau bam ep nude dudi -4000m, tham chi nhieu gieng tiep nhan nude den chieu sau -4200m va -4500m, Nhd quy gieng khoan bam ep nay, giai doan 1995-2000 da tang dugc dang ke khdi lugng nuge bam ep, den bu du san lugng khai thac dau cang tang va cho phep tien hanh mot sd giai phap dieu ehinh: Bam ep theo chu ky, phan phdi lai khdi lugng nugc bam ep theo nguyen tac edng nghe da xac dinh: Dung thdi gian, dung vi tri, dung khdi lugng va dung ap suat Nguyen tac "4 dung" dam bao cho viec dieu chinh qua trinh bam ep cho mat tiep xuc dau nuac duac kiem soat va dang len mdt each ddng deu nhat cd the dugc va ehinh day la dieu kien quyet dinh dam bao dat he sd thu hdi dau cao cho tang mdng md Bach Hd Vdi y nghla nang cao he sd thu hdi dau, cac giai phap ddng vai trd dam bao he sd quet (he sd bao trum) tdi da cd the dugc, Tudd chung ta ed the ket luan rang: Khoan sau vao vung can day than dau b^ng than a ngang dinh hudng thing gdc vdi phuang phat then eae ddi dap vd cua tang mdng, dam bao cac gieng ed dp tiep nhan tdt d cac khoang sau la giai phap da dugc ap dung rat hieu qua d Vietsovpetro thdi gian qua 10 Hoi thdo khoa hoc "Ndng cao he sdthu hdi ddu mo Bqch Ho' va se edn tiep tuc dugc phat trien tiep theo nham dam bao nang cao he sd thu hdi dau, giai phap cung cd the dugc van dung cho eae md ed dac tinh cau true tUdng tu tang mdng md Bach Hd Tren Sd dd the hien ddng thai khdi lugng nude bdm ep cija cac gieng bdm ep theo thdi gian Dong thai dd la ket qua eija cac quyet dinh dieu chinh qua trinh bdm ep nude nham muc dich den bu du san lugng dau cao va khdng che dp ngap nude d mire tdi thieu cd the cd dugc Viec dieu chi'nh dugc tien hanh tren cd sd thudng xuyen phan tich tinh trang khai thac cac gieng bdm ep nhd cac thdng tin tren md, nghien eCru gieng cija Xi nghiep Khai thac, Xi nghiep Dia vat ly gieng khoan va xir ly thdng tin tren md hinh sd nhiet thuy ddng Viec dieu chinh hgp ly qua trinh bam ep da gdp phan cai thien tinh trang ngap nude cac gieng khai thac va chtrng minh cho quan diem: Cach tdt nhat de giam dp ngap nude cac gieng khai thac la phan phdi hgp ly khdi lugng nude bdm ep cho tUng vung cu the ehU khdng phai la han che khai thac dau va edn vi cac giai phap each ly cac khoang bi ngap nude dieu kien cu the eae gieng tang mdng hien chua thu dugc hieu qua Song song vdi viec khoan cac gieng a ngang xudng vung can day than dau de bdm ep nude, Vietsovpetro da khoan edng hang loat gieng cd than a ngang vao vung can nde via cho luu lugng Idn va vi vay da giam dugc gradient ap suat thiiy ddng va tao dugc mdt ddi dem dij Idn giua ddi thu hdi chu luc va ddi bam ep chinh, da tao nhOng dieu kien tdt de mat tiep xuc dau nude dang len ddng deu hdn, han che chieu cao cac ludi nude, tang dugc he sd quet va nhu vay lam tang he sd thu hdi dau Tu 1997, mdt sd gieng khai thac bi ngap nude d phan dudi da dugc each ly bang cau xi mang va ban len phia tren (each ranh gidi xuat hien nude 200-300m) cho luu lugng Idn dau sach, keo dai on dinh 4-5 nam Tuy nhien sd gieng khai thac ed cac khoang coleeto tdt chua dugc md chi edn vai ba gieng, vay hieu qua cua giai phap khdng hy vpng edn nhieu Giai phap ed y nghTa lam tang thdi gian khai thac dau cac gieng, nang cao hieu qua cua sa dd khai thac hai ddi va giam khdi lugng khai thac nude ddng hanh, giam chi phi bam ep nude De hoan thien sd dd khai thac hai ddi, chung tdi da chuyen gieng bdm ep ed khoang bdm ep tudng ddi cao (-3800 - -3900m) gieng khai thac bang each ban len phan tren can nde via va each ly phan dudi bang cau xi mang Thuc te cac gieng cho luu lugng tudng ddi cao va on dinh mdt thdi gian dai khdng cd nude san pham Giai phap se edn dugc tiep tuc phat trien cho giai doan 2002-2005 (10-12 gieng) thudc vao viec khoan va dua vao bdm ep cac gieng mdi tren BK7, BK9 va cac BK mdi Su thay the dan cac gieng bdm ndng bang cac gieng bdm sau se gdp phan quan trpng phan phdi lai hgp ly khdi lugng nude bdm ep theo nguyen tac "4 dung" va nhu vay cai thien dugc dang ke ddng thai ngap nude va he sd quet TU 1997, Vietsovpetro da thCr nghiem tren md giai phap bam ep theo chu ky d gieng 804 va 405 Thdi gian mdt chu ky d day la thang; keo dai nam Danh gia hieu qua cua giai phap gap nhieu kho khan vi ty phan qua nhd eiJa cac gieng (khoang 6-8%) so vdi tdng khdi lugng nude bam ep vao via quan he thiiy luc giua cac vung d khdi Trung tam la rat tdt Cd the mot nguyen nhan nua la thdi gian cho mdt chu ky thang la chua dij dai de nhan biet dugc hieu ung eija no Tren mdt vai vung, dUng bdm ep hoan toan mdt gieng bam ep nao dd thi sau han nam mdi thay dugc hieu Crng rd ret cua nd len ddng thai ngap nude cua eae gieng khai thac xung quanh Han nua kieu coleeto ntrt ne - hang hoc cija tang mdng md Bach Hd (hau nhu khdng cd dau matnee) khae vdi kieu coleeto dp rong dp tham thdng thudng (dau chira matrice rat nhieu), cd the vi the ma hieu qua cai thien he sd quet bang giai phap bdm ep theo chu ky khdng dugc the hien Day la van de can dugc tiep tuc dau tu nghien cuu thCr nghiem ca tren md hinh sd thuy ddng va ca tren md Sd lugng gieng khai thac bi ngap nude cang nhieu, mure dp ngap nude cang tram trpng Tim tdi va ap dung cac edng nghe each ly dugc cac khoang ngap nude gieng khai thac, giam khai thac nude ddng hanh la mdt yeu cau buc thiet tU ehi mdt vai gieng d tang mdng md Bach Hd bi ngap nude Mae du da trien khai mdt sd edng nghe (rat cong d cac loai md hinh khae tren the gidi) d gieng tang mdng 11 Hoi thdo khoa hoc "Ndng cao he sdthu hoi ddu mo Bqch Ho' song ket qua khdng dat yeu cau, gieng 110 va 802 dung edng nghe bdm nhet xi mang vao khoang bi ngap nude, ket qua la phan tram nude san pham giam dang ke nhung ddng thdi luu lugng dau lai giam manh va nhu vay rd rang la khdng dat yeu cau gieng 902 va 904 da dung hda pham sinh keo tu bam vao gieng nham bit cac khoang bi ngap nude, sau ap dung cac giai phap de giai phdng su ed, ca hai gieng dugc dua trd lai lam viec vdi cac thdng sd xau han so vdi trudc xu ly Rd rang la vdi dac tinh ngap nude rieng biet rat phCre tap, dieu kien than tran, coleeto nut ne hang hoc bat ddng nhat cao, nhiet dp via cao (130-150°C), viec xCr ly, ngan each nude ed chpn lua ddi vdi cac gieng tang mdng md Bach Hd vin dang edn la mdt thach thirc Idn trudc eae nha khoa hoc nhieu nganh va cac nha san xuat dau Day cung la mdt hudng can dau tu tiep tuc nghien eUu Nghien cCru va then khai tren md che dp edng nghe hgp ly cho cac gieng cung la mdt giai phap dugc thudng xuyen quan tam chi dao, Theo dinh nghTa chung, tinh hgp ly cua viec khai thac mdt md la thu hdi dau tdi da vdi chi phi tdi thieu Cd the cd nhieu each van dung khai niem dd cho mdt ddi tugng khai thac cu the dieu kien phat trien md xac dinh Ddi vdi tang mdng md Bach Hd, chung tdi tiep can khai niem dd nhu sau: Che dp cong nghe hgp ly cho cac gieng khai thac va bam ep la che dp dam bao can ddi cac yeu cau edng nghe - ky thuat - kinh te sau day: - Yeu cau ve san lugng khai thac dau, theo ke hoach cija Xi nghiep, cua Tdng edng ty - Yeu cau khai thac tdi thieu cd the dugc khdi lugng nude ddng hanh, cd nghTa la dp ngap nude nhd nhat cd the dugc va he qua la khdi lugng nude bdm ep giam den mtrc nhd nhat can thiet - Yeu cau an toan mdi trudng - Yeu cau tan dung tdi da nguon tai nguyen Idng dat, cd nghTa la dam bao dat va vugt gia tri he sd thu hdi dau theo van lieu thiet ke phat trien md da phe duyet Nhu vay, che dp edng nghe hgp ly d day vUa mang y nghTa trudc mat, cd the la tam thdi, cue bd song van dam bao y nghTa lau dai, ed dinh hudng cho toan md Nhan thtre nhu vay nen nhieu nam qua, bang kinh nghiem thuc te va cac edng trinh nghien ciru [4], che dp edng nghe cac gieng khai liidC va bdm ep da dugc xem xet mdt each than trpng, thudng xuyen dieu chinh de dam bao can ddi yeu cau da neu tren Che dp edng nghe cac gieng khai thac va bam ep cua tang mdng md Bach Hd dang dan tiem can den mirc hgp ly dam bao cho viec dat va vugt gia tri he sd thu hdi dau phuang an sd dd edng nghe -1998 da dugc phe duyet Chung tdi manh dan neu dudi day mdt sd ket luan ban dau, ddng thdi dat mdt sd chCi de de trao ddi thao luan: - Tiem nang de ed the gia tang san lugng khai thac dau khia md Bach Hd la hien thuc - Ca sd vat chat ky thuat, dpi ngu can bd va eae nghien eUu da tien hanh d Vietsovpetro la to Idn song can cai tien sap xep cho hgp ly nham khai thac tdi da va cd hieu qua cac tai san quy gia Cac nghien cuu chuyen de, chuyen sau, cac phan mem chuyen dung phuc vu bien luan nang cao he sd thu hdi dau can dugc md rdng va ddng bd hda - Bdm ep nude vao via la phuang phap hien thuc da mang lai hieu qua kha cao ITnh vuc nang cao he sd thu hdi dau Vietsovpetro da dat dugc nhung ket qua bude dau rat quan trpng ve hoan thien sa dd khai thac, kiem soat va dieu chinh dugc qua trinh khai thac thdng qua md hinh sd thuy ddng vdi cac thdng sd cua md hinh tuang hgp vdi cac dac tinh heng biet cua tang mdng md Bach Hd Can tiep tue hoan thien md hinh va khai thac tdi da cac tiem nang cua cac phan mem chuyen dung ve nang cao he sdthu hdi dau Bdm ep nude theo chu ky va each ly nude cd chpn Ipe eae gieng tang mdng chua hieu qua, can tien tue tuc dau tu nghien nahien cuu them tiep them 12 Hoi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bqch Hd " Giam dd ngap nude bang viec xu ly hgp ly che dp bam ep nude (nguon gdc gay ngap nude) d tung gieng va toan bp cac gieng la giai phap kha thi hien d Vietsovpetro Trong qua trinh bam ep nude phai thudng xuyen dieu chinh eae thdng sd theo nguyen tac "4 dung" va xac dinh dung dan che dp edng nghe cac gieng khai thac va bam ep Day la giai phap huu hieu de nang cao he sd quet he sd thu hdi dau eae giai phap khae (hda hpc, vi sinh, khO ehi mdi dUng d mUc tim tdi thu nghiem chua ehUng minh dugc gia tri kinh te - ky thuat Tang quy gieng cho tang mdng md Bach Hd de cd the thuc thi cac giai phap dieu ehinh khai thac va bam ep bang each xay dung them cac edng trinh bien mdi va tan dung tdi da kha nang khoan bd sung gieng mdi eat than thu hai tu cac gian hien cd Khoan than gieng ngang vao day than dau dinh hudng thing gdc vdi phuang phat trien ddi dap vd cua tang mdng de bam ep nude vao via la giai phap mang hieu qua kinh te ky thuat cao Can md rdng, phat trien khdng nhung cho md Bach Hd va ca cho cac md khae cd dieu kien tuang tu 13 ... dpi ngu can bp ky thuat ddng ve sd lugng, cd kha nang tiep thu va ap dung cac edng nghe mdi nang cao he sd thu hdi dau Tuy vay de then khai edng cac giai phap nang cao he sd thu hdi dau cho eae... vu bien luan nang cao he sd thu hdi dau can dugc md rdng va ddng bd hda - Bdm ep nude vao via la phuang phap hien thuc da mang lai hieu qua kha cao ITnh vuc nang cao he sd thu hdi dau Vietsovpetro... nude dat he so thu hoi dau gap lan, Chinh vi nhiet dp via cao cua cac doi tugng (>115°C), nen cac phuang phap hoa hoc, vi sinh, chua phai la phuang phap hien thuc de nang cao he so thu hoi dau Su