Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bach Hd " MOT s6 GlAl PHAP GIA TANG Hf s6 THU H6I DAU M 6 BACH H 6 Nguyen Ouoe Thap, Le Van Truang, Nguyen Quoc Thang Cong ty Dau tu''''d Phat trien Dau k[.]
Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bach Hd " MOT s6 GlAl PHAP GIA TANG Hf s6 THU H6I DAU M BACH H Nguyen Ouoe Thap, Le Van Truang, Nguyen Quoc Thang Cong ty Dau tu'd Phat trien Dau ABSTRACT Bach Ho oil field was discovered m 1974 by Mobil and put on production in 1986 by Vietsovpetro Since that time, a total of app 100 million ton of oil was produced from the field According to the latest production forecast, the field life is soon going to be in the decline phase Therefore, enhance oil recovery (EOR) is most important method to maintain the filed life and maximize value of the filed Water injection has been applied to maintain resen/oir pressure successfully However, at some stage water injection management has experienced many difficulties & water breakthrough has occurred abnormally due to the key reservoir (fractured granite basement) of the field is very complex and heterogeneous in term of physical properties as well as the unceriainty of the aquifer In this paper, the authors will highlight some ideas on how we might be able to improve our exploitation skills to optimize & increase the oil recovery of the Bach Ho field We will look closer at what needs to be done to optimize the reservoir data and the exploitation tools, and what are the needs of the Bach Ho reservoir management I CAC PHLTONG PHAP GIA T A N G H $ S6 THU H | DAU T R E N T H ^ GICJI Van de gia tang he sd thu hdi dau da dugc dat tU rat lau cdng nghiep khai thac dau Theo thdi gian va cung vgi sy phat trien cua nganh dau khi, cung nhu yeu cau khai thac tan thu cac md dau cu cac nha nghien cUu da gidi* thieu va ap dung edng rat nhieu phuang phap gia tang he sd thu hdi dau Theo cac dinh nghla mdi nhat cua hiep hdi dau the gidi SPE thi giai phap thu hdi dau bang bam ep nude thdng thudng khdng phai la phuang phap gia tang hay nang cao he sd thu hdi dau va ehi ed cac nhdm phuang phap Hinh dudi day dugc gpi la cac phuang phap gia tang he sd thu hdi dau Nhin chung lai, cd phuang phap gia tang he sd thu hdi dau, bao gdm: Phuang phap bam ep nita Idng hay (ed the la COj), phuang phap bam ep polymer, phuang phap ddt tai via, phuang phap bam ep nude nong, phuang phap bam ep ddng thdi chat hpat tinh va polymer hoae kiem, phuang phap bam ep CO2 va phuang phap bam hydrocarbon Idng Bom uirdc uoug Khi kho Dot hydro carbou CO, Cac chat ho^t tfuh 53 Hoi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bach Ho' Cac phuang phap deu cd chung mdt nguyen ly la dya vao C3c phan Ung ly hda cua qua trinh tiep xuc giua nude hay hdn hgp bam ep ed chCra hda pham lam tang he sd quet va day dau, giam he sd dp nhdt cua dau hay giam ty trpng eua dau dng khai thac, hoae gia tang kich thudc vCing cung cap ddng xung quanh gieng khoan Mdi phuang phap se ehi thich Ung vdi tUng dieu kien ky thuat md, dieu kien cung cap vat tu hda pham va cung nhu kha nang cho phep cua he thdng thiet bi hien da cd trudc dd tai md Do dd, de xem xet kha nang ap dung cac phuang phap ndi tren cho mdi mpt mdt ddi tugng hay md dau, trudc het can tien hanh eae nghien eUu kha thi ve ky thuat va kinh te eua mdi phuang phap Cac tdng ket dya tren cac kinh nghiem ap dung cdng viec gia tang he sd thu hdi dau cho cac ddi tugng khai thac dau khae tren the gigi dugc tdm tat Bang va Hinh TU cac tdng ket Bang va Hinh cd the de dang danh gia lya chpn cac phudng phap mdt each thich hgp ve cac dieu kien ap dung Vi vay, cac ddi tugng ehUa eua md Bach Hd can phai dugc nghien cuu hien trang ky thuat de tU dd cd ca sd de xuat eae giai phap cdng nghe phu hgp nham gia tang he sd thu hdi dau II OAC OI^M VA HIEN TRANG KHAI THAC M BACH H Md Bach Hd nim Id 09.1, them luc dia Nam Viet Nam each phd Vung Tau 120 km ve phia Ddng Nam, dugc Cdng ty dau Mobil phat hien dau tien vao thang nam 1975 thdng qua gieng khoan tham dd BH-1, Md ed dien tich khoang 120-130 km^vdi chieu sau nude bien khoang 50 m, Cac ddi tugng chCra chinh eua md bao gdm: Cat ket Miocene dudi, Oligocene tren, Oligocene dudi va tang da mdng granite nut ne & phong hda, Tdng tru lugng dau tai ehd eua md tinh den thgi diem 01.01.2002 khoang 630 trieu tan, dd, rieng tru lugng eua tang mdng granite nut ne & phong hda chiem -80%, Dac tinh eua dau thd va eae thdng sd ca ban eua eae ddi tugng ehUa ehinh md Bach Hd dugc tdm tat Bang Nhin chung, dau cua cac via thupe Ipai dau cd ty trpng trung binh, dp nhdt thap va phan nhe cd dau tU trung binh den cao; via cd chieu sau Idn (3000-5000m), nhiet dp cao (90-170°C), dp rdng thap den trung binh (da cat) va thap 0,5-4,0% (da mdng granite nut ne phong hda) 0) (0 o 10 20 30 40 50 60 Ty trpng cua dau (API) Hinh Khoang cliieu sau va ty cua dau ap dung cac phu'ong phap gia tang he so thu hoi dau 54 Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu ino Bach Hd " Bang 2: Cac tham sd ehinh eua cac ddi tugng chua md Bach Hd Cac ddi tUdng chinh cua mo Bach Ho Cac dac tinh ly hoa Miocene dUdi Oligocene tren Oligocene dUdl Mong phong hoa nirt ne Ty trpng dau (g/cm') 0.86 0.85-0.88 0.82-0,83 0.82-0.84 50 >70 Cat ket Cat ket Cat ket Granite phong hda, nut ne Dp nhdt (cp) Lpai da chua Chieu day via Mdng -trung binh, Mdng-trung binh, gdcnghieng nhd Trung binh - Idn, gdc gdc nghieng nhd nghieng nhd den trung binh >500m >10 >10 >10 >100 Chieu sau via (m)