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Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Hd" VAN D ^ NGAN CACH NUdc TRONG CAC GI^NG KHOAN TANG M 6 N G M 6 BACH H6 Tran Hdng Phong XNLD Vietsovpetro ABSTRACT The Author generalized specif[.]
Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Hd" VAN D ^ NGAN C A C H NUdc TRONG CAC GI^NG KHOAN TANG M6NG M6 BACH H6 Tran Hdng Phong XNLD Vietsovpetro ABSTRACT The Author generalized specific properties of the "White Tiger" oilfield fractured basement resen/oir He d the panorama of the present water injection technology for oil recovery in the pseudo-water drive basement an confirmed the optimum advantages of the present water injection-oil production system in the "White Tiger" oil In conclusion He said that the increment of the sweep efficiency of water flooding is a main measure, to increasing the oil recovery factor by means of the water permeability profile adjustment to overcome the resen/oir permeability heterogeneity There's information about experiences of VSP, obtained in the water shut-off operations in the basemen producers and water permeability profile adjustment in miocene water injectors of the "White Tiger" oilfield in recent years and measures to be taken for investigation & application in the next period I.DATVANO^ Bach Hd la md dau Idn nhat hien cua nude CHXHCNVN Tai day, dau dugc khai thac tU than dau da mdng chie'm khoang 90% san lugng hang nam eua md Oa mdng phan bd d dp sau Idn 3050-5000m, dieu kien nhiet cao 120-150°C, ap suit via hien dang thap han ap suit thuy tinh, mdi truang tham thudc dang nut ne - hang hoc khdng ddng nhat Trong qua trinh khai thac de dam bao san luang dn dinh, VSP dang ap dung phuang phap tri ap suit via tren ap suit bao hda bang bien phap bam ep nude xudng tang day d sau dugi 4000m va khai thac than dau mdng d tang tren Nhiet dp via cao nen nhgt chat luu thip va viec day dau bdi nude d§ dang Nude bien ed tinh kiem (pH -7,8), da dang Hydrophillie tao dp rua tdt khdng can dung hda chat Viec tri ap suit via tren ap suit bao hda la giu luu chit (dau, khi, nude bam ep) ludn d trang thai Idng mdt pha ed ddng nang cue tieu, bam nude tu day len de tri via d trang thai the nang Idn nhat la dieu kien bao dam mat phan each nude dau ed the dieu khien dugc dn dinh va phang Tat ca nhung yeu td tren la tien de de dam bao via ludn d trang thai vl md cd xac suit Idn nhat, de via vin tri dieu kien can bang ddng ben vCrng neu chung ta khdng lam xuat hien nhung ludi nude qua trinh bam ep Nhu vay, ve phuang phap tac ddng va eae thdng sd trang thai vT md eua via (Pp t °C, Pbh ) eho phep khang dinh tinh tdi uu eua he thdng dang khai thac Viec cdn lai la khae phuc tinh bat ddng nhat eua mdi trudng thim nCrt ne de bao dam he sd quet cao nhat - ddng nghla vdi he sd thu hdi d i u cao nhat II THLTC TRANG Tang mdng md Bach Hd bat dau bam ep nude tU 1993 (xem Bang sau); Nam 1993 1994 1995 1996 1997 1998 1999 2000 2001 Khoi luong nghin(m^) 258,119 1,361,000 6,003,209 10,112,31213,386,621 16,056,053 15,480,318 18,578,546 19,671,839 11 13 17 12 20 21 25 G bom ep % ngap nude 0 0.1 0.9 \ 0.6 \ i 0.7 3.7 4.3 4.3 Trong qua trinh khai thac VSP da ap dung nhieu bien phap tdng hgp de dieu hda phdng nude va lam tang he sd quet nhu chuyen hudng ddng bam ep theo chu ky, dieu hda san luang khai thac theo khu vuc, nhd vay ma den VSP van kiem soat duac qua trinh khai thac tang mdng mdt each hieu qua 192 Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bach Hd" Tuy nhien de khai thac het kha nang ed the de tang he sd quet dieu kien dp tham bit ddng nhat can thie't phai bd sung phuang phap dieu hda phdng nude tU eae gie'ng bam ep va each ly tang ngap nude d eae gie'ng khai thac Dieu hoa phong ni/dc: Thang 11.1996, XNLD da thCr nghiem bam polimer vao gieng bam ep 202-4 tang Mioxen de thu nghiem sau dd kiem tra xac nhan ed hieu qua dieu chinh phdng nude khoang 5% (bien ban ky thuat 22.08.1997) Do dac diem cau tao tang mdng, khae biet so vdi Mioxen d ehd: Tang mdng nUt ne hang hde vdi nhiet dp cao nen viec tien hanh dieu hda phdng nude d tang mdng can phai nghien cUu phan hda pham phu hgp vgi dieu kien dac thu eua ting mdng, bao dam khdng anh hudng den chit luang xCr ly cua edng nghe khai thac hien hanh hda pham theo nude via vao he thdng edng nghe Cach ly tang ngap ni/dc: Odi vdi eae gie'ng bi ngap tU day, viec each ly tap nude bang phuang phap dd cau xi mang va khai thac tang tren la eae bien phap thdng thudng d XNLD Rieng vdi cac gie'ng bi ngap nude d ting giua hoae tren hoae tUng phan, khdng the thuc hien each ly bing eae bien phap thdng thudng Thang 12.1999 XNLD da tien hanh thCr nghiem tren gie'ng khai thac 902 va 904 thudc ting mdng Bach Hd, ban chat eua phuang phap la bam hda pham sinh keo tu vao gie'ng khai thac Hda pham cd dac diem ehi tac dung vdi nude via d tang ngap nude va bi polimer hda ddng dac 24 gid, bit tang ngap nude eua via nhung hda tan va khdng ddng tu dau Ket qua khdng dat yeu cau su ed gpi ddng Nguyen nhan qua trinh ggi ddng dau ed chua polimer hda tan va nude cd keo tii la nhung chat luu ed thudc tinh deletant (chat Idng dan hdi) nhgt dpng luc tang theo van tdc nen vao bam ly tam van tdc cao, luu chit cang quanh lai lam ket bam III GlAl P H A P Hien nay, tren the gidi phd bie'n phuang phap each ly tap nude cac gieng khai thac: - Phuang phap hoa hgc decach ly nude va dieu hda profile bam ep van la phuang phap phd bie'n mac dii cdn cd nhung nhugc diem nhu: Thgi gian tac dung eua polimer via va hieu qua cua phuang phap chua dugc xac djnh chinh xac nhung viec dieu chinh phdng nude bang polimer trudng hgp nd khdng lam giam dp nhan eua gie'ng dugc danh gia la vd hai neu khdng tang he sd quet va uu diem ehinh eua nd la xCr ly dan gian, khdng phai dung thap khoan de keo tha can, diing eho mpi dia hinh than gie'ng d khu vuc san pham md khong chdng dng, re tien nen van la hudng nghien cuu ehinh de xCr ly hien Ngay 13.05.02 VSP da td ehUc eude hop ky thuat de thue hien muc 4.5 nghi quyet HO XNLD XXV ve "Chuang trinh tdng hgp each ly nuge cac gie'ng khai thac tang mdng Bach Ho", da scan thao yeu cau ky thuat ve phan hda pham va edng nghe xCr ly cac gie'ng khai thac tang mdng, va tien dp thuc hien chuang trinh giai doan 2002-2003 se dugc trinh lanh dao phe duyet thang 6.2002 Nhu vay, giai phap dugc chpn se la phuang phap hda hgc de each ly nuge tang mdng md Bach Hd Ngoai ed phuang phap ed the tham khao la: - Phuang phap ea hoc: Oat dng kim loai day tu 6-10mm de bit nude theo edng nghe eua Baker Petrolite va Tatheftb Phuang phap ed uu diem la thep day ed the chiu dugc chenh ap cao giua via va day, nhuac diem la khdng the phu kin dia hinh khdng chdng dng va dd cd the dich chuyen khdng kiem soat duac gie'ng - Phuang phap Polimer hoa: Hang Schlumberger dung ky thuat tha nhu ky thuat dat dng kim loai, mdt dng Composite mem dugc che tao bang sgi carbon, cao su tdng hgp ben nhiet va vd dan hdi dugc tha bing cap dien vgi dung cu tha xudng gie'ng Khi thie't bi den vung can each ly, dung cu tha lam viec va lam nd dng Composite, cao su tdng hgp se duac gia nhiet cho den bi polimer hda trd nen hoan toan cung va chiu ap suit, vUa van bit kin mgi dia hinh Phuang phap da dugc su dung d gian Brent Alpha thudc bien Bic eho ket qua giam den 10% lugng ngap nugc d gieng khai thac Bien phap cung cd the ap dung de dieu hda phdng nude d cac gieng bam ep theo each tuang tu va la phuang an du phdng trudng hap phuang phap hda hgc cd nhung han che dieu kien nUt ne va nhiet cao cija via gay khdng chon dude phan hda pham phu hgp hoae thu nghiem khdng dat yeu cau 193 ... bam ep 202-4 tang Mioxen de thu nghiem sau dd kiem tra xac nhan ed hieu qua dieu chinh phdng nude khoang 5% (bien ban ky thuat 22.08.1997) Do dac diem cau tao tang mdng, khae biet so vdi Mioxen... hai neu khdng tang he sd quet va uu diem ehinh eua nd la xCr ly dan gian, khdng phai dung thap khoan de keo tha can, diing eho mpi dia hinh than gie''ng d khu vuc san pham md khong chdng dng,