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Tuygn tap bao cao HQi nghj KHCN "30 nam Dau khi Viet Nam Cff hdi mdi, thach thiic mdi" 877 MO PHONG SO DONG CHAY NHIEU PHA T6I D A Y GIENG TRONG CAc GIENG KHAI THAC BANG GASLIFT GIAN DOAN TAI CAC GIEN[.]
Tuygn tap bao cao HQi nghj KHCN "30 nam Dau Viet Nam: Cff hdi mdi, thach thiic mdi" 877 M O PHONG SO DONG C H A Y NHIEU PHA T6I D A Y G I E N G TRONG CAc GIENG KHAI T H A C B A N G GASLIFT GIAN DOAN TAI CAC GIENG M O BACH HO Dang The Ba, Duong Ngoc Hai Viin Co hoc TOM T A T Bdi todn ddng chdy t&i day giing cdc giing khai thac bdng gaslift gidn dogn dugc md td bdng cdc phucmg trinh ddng chdy nhiiu pha ddi xirng true mdi tru&ng rdng ciing v&i cdc dieu kiin biin vd diiu kiin ban ddu phu hgp Dung phuong phdp sai phdn thi tich hiiru hgn cung v&i thudt gidi IMPES di gidi cdc phucmg trinh, kit qud thu nhgn dugc trucmg dp sudt vd phdn bd bdo hod cua cdc pha vung ldn can giing cung nhu tgi day giing Cdc kit qud dugc so sdnh v&i l&i gidi tich tru&ng hgp ddng mdt vd hai pha Sau dd chuong trinh da dugc su dung de tinh khd ndng phuc hdi dp sudt ddy giing (cdt ddu giing) sau mdi chu ky gaslift hodc th&l gian di giing phuc hdi dp sudt day giing din mdt gid tri cdn thiet xdc dinh tru&c cho mdt sd giing cua md Bgch Hd MO DAU Gaslift gian doan da dugc xem nhu mot lira chgn hieu qua de khai thac cac gieng dau chi sd khai thac cua gieng va ap suat day tut giam, dd viec phun lien tuc cac gieng khai thac bang gaslift khdng cdn hieu qua va khdng kinh te niia Tren the gidi, ky thuat gaslift gian doan da, dang dugc ap dung nhieu va cd hieu qua, vi du md d viing hd Maracaibo cd den 90%) sd 7000 gieng khai thac bang gaslift, dd cd 760 gieng khai thac bang gaslift gian doan va hang nam cd den 150 gieng chuyen tir khai thac gaslift lien tuc sang khai thac gaslift gian doan CJ nude ta hien nay, mdt sd via ldn sau mdt thdi gian khai thac, ap suat via da suy giam, luu lugng dau khai thac tai nhieu gieng xudng thap, cac phuong phap khai thac kbac khdng cdn hieu qua thi ky thuat gaslift gian doan ciing da bat dau dugc ap dung Tai md Bach Hd da lap dat va bude dau thii nghiem ky thuat gaslift gian doan cho 11 gieng va ket qua la luu lugng cac gieng deu tang tu - 8tan/ngay dem, nhiet dau mieng gieng tang, yeu td nen giam khoang - ian Viec ap dung ky thuat gaslift dac biet la gaslift gian doan dat khdng it cac bai toan can giai quyet tinh toan thiet ke cac thdng sd boat ddng cho cac gieng khae tai nhiing md khae Trong dd cd bai toan ddng chay tu via vao gieng Lugng dau khai thac bang gaslift gian doan tung gilng cd thi tang len bing each xac dinh va thilt lap cac thdng sd boat ddng tdi uu, dd cd viec xac dinh va tii uu boa khoang thdi gian phuc hdi ap suat day gieng (cdt chat ldng cin nang) ciia gilng sau mdi chu ky bom diy Trong tinh toan khai thac, ddng chay tu via vao gilng thudng dugc dac trung bdi 878 Md phdng sd ddng chay nhigu pha toi day gigng cac gilng khai thac bang Gaslift.•• he sl san pham ciia gilng cac cbl khai thac dn dinh (Dake, 1978) Dac trung khdng cdn dung dugc chi khai thac gaslift chu ky vi dd che ddng chay khdng cdn thoa man cac dilu kien ddng chay dn dinh ma cd nhiing bien ddi ldn ca ap suat va luu lugng Ngoai tinh toan khdng the bd qua ban kinh gilng vi lugng dau tich luy gilng la dii tugng chinh ma ky thuat gaslift chu ky tim each thu hdi Vi vay, cac ly thuyit vl ddng chay khdng In dinh xem xet gilng nhu la ngudn dudng (Dake, 1978) ciing khdng ap dung dugc Vdi viec md rdng bai toan ddng khdng dn dinh den day gieng coi gilng cd ban kinh bing khdng va ddng chay day gilng cd luu lugng khdng ddi bai toan cd kl din ban kinh gilng va luu lugng thay ddi dang bae thang sau dd ap dung nguyen ly chdng nghiem, cac kit qua [1] (D.N Hai va D.T Ba, 2004) da xac dinh dugc dien biin phuc hii ap suit day gilng ong khai thac biet trudc luu lugng mdi chu ky gaslift Tuy nhien, bai toan chi dimg d trudng hgp ddng chay mot pha, via ddng nhat Trong khudn khd cac nghien cuu d day, cac gia thuyet nhat dinh phii hgp vdi thuc te khai thac da dugc sii dung nhu: gieng hoan hao, mien anh hudng la vd ban, ddng chay ddi xung true Bd qua anh hudng cua yeu td nen len ddng chay via Ddng chay tir via vao gieng dugc md ta bang he cac phuong trinh ddng chay nhieu pha ddi xiing true mdi trudng rdng Cac dieu kien bien va dieu kien ban dau dugc dat phii hgp vdi cac dac trung tai day gieng gaslift chu ky Phuong phap sai phan the tich hiiu ban vdi thuat giai IMPES da dugc ap dung de giai he cac phuong trinh chuyen ddng va thu nhan phan bd trudng ap suat va bao hoa cac pha dge theo hudng ban kinh ciing nhu tai day gieng Luu lugng ddng chay ciia cac pha vao gieng dugc tinh theo ty le linh ddng pha Chuang trinh tinh da dugc lap va kiem tra vdi cac trudng hgp don gian cd nghiem giai tich Sau dd ap dung tinh toan vdi mdt sd gieng thuc te ciia md Bach Hd Cac kit qua so sanh cho thiy cd sir phii hgp tdt gitra cac ket qua tinh vdi cac nghiem giai tich ciing nhu kit qua dac thuc te Chuong trinh cd the sii dung de xac dinh dac trung phuc hdi ap suit day gilng lam CO sd de danh gia, thiet ke gaslift chu ky, hoae ket hgp vdi chuong trinh ddng chay Ing nang de tinh toan cac thdng sl lam viec cho cac gilng, hoae dl tinh toan, chinh xac hoa cac thdng sd via viing ian can gilng dii vdi cae gilng da thi nghiem gaslift chu ky GASLIFT CHU KY Tren Hinh la so dd nguyen ly va Hinh la trang thai ap suit gilng ciia mdt gilng thuc te cac chu ky gaslift gian doan Tir dd cd thi thiy ring mdt chu ky khai thac, ddng chay den day gieng cd thi chia giai doan: • Giai doan thii nhat, tir liic nen bit diu vao dng khai thac din mit diu dugc nang len den mieng gieng (Ti) Trong giai doan ap suit day gilng ldn ban ap suit via viing ian can day gieng vi vay cd thi coi la khdng cd ddng chay tir via vao gilng • Giai doan thii 2, tir liic dau bat dau khdi mieng gilng den mit diu thoat hit khdi mieng gieng va ngung cap vao dng nang (T2) Trong giai doan nay, ap suit ldng gieng bat dau giam, tuong iing ap suit day gieng cung giam, ddng chit ldng viing ian can day gieng bat dau chay vao day gieng Tuygn tap bao cao HQi nghj KHCN "30 nam Dau Viet Nam: Cff hdi mdi, thach thiic mdi" 879 • Giai doan thii ba, la giai doan tii ngimg d p vao dng nang va dau via tu chay vao day gilng dl phuc hdi cdt ap Ing nang din dat dugc cao can thilt dl bat diu chu ky tilp theo (T3) Trong giai doan nay, kbac vdi bai toan phuc hdi day gilng xem xet gilng nhu mdt ngudn dudng d chd luu lugng chay vao day gieng la kbac khdng va tdng luu lugng la the tich ciia cdt dng nang tuong iing vdi cao cdt ap da phuc hdi dugc, neu bd qua tinh nen dugc ciia dau than gieng Luu lugng theo thdi gian giai doan thay ddi phu thudc cdt ap day gieng, ap suat via, va cd dang nhu tren Hinh "A Hinh 1: So" hoat dong ciia mot chu ky gaslift gian doan Bf sSu dft van gas lift I - 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