Hoi nghj KHCN 2000 "Nginh Dad khi Viet Nam trifdc them theky2r AP DUNG HE DUNG DICH KHOAN POLIME IT SET e^ THI CONG CAC GIENG KHOAN CO GOC NGHIENG LON QUA DIA TANG OLIGOXEN W(^\ Vk TANG DA MONG MO BAC[.]
Hoi nghj KHCN 2000 "Nginh Dad Viet Nam trifdc them theky2r AP DUNG HE DUNG DICH KHOAN POLIME IT SET e^ THI CONG CAC GIENG KHOAN CO GOC NGHIENG LON QUA DIA TANG OLIGOXEN W(^\ Vk TANG DA MONG MO BACH HO TS Ngo Van Tu KS Nguyen Trong Nghiem XNLD Vietsovpetro TOM TAT He dung dich khoan polime phi set ANCO - 2000 da dugc chinh thirc dua vao ap dung cong dethi cong nhUng gieng khoan ngang a mo Bach Ho Tuy nhien, ben canh nhdng uu diem co dugc, ANCO - 2000 boc lo m so nhugc diem, nhu anh huang cua nhiet cao, cau true dung dich tra nen kem ben vUng De on dinh cac thdng so luu bien da phai tieu ton mot lugng iOn hoa pham polime tao cau triic de xir ly qua trinh khoan Ngoai ra, khoan qua cac iOp dat da phi set (da granit) khong du kha nang tao igp vd set ngan each ben vUng co tham nho tren gieng khoan nen dung dich de" tham mat vao via, dac biet la gap tang da mong nui ne, tu gay nen hien tugng bit via, lam anh huang den qua tnnh ggi dong va giam san lugng khai thac ban dau ciia gieng De khae phuc nhCtng han che noi tren, Vien NCKH&TK Dau bien da nghien cdu va dua vao ap dung he dung dich khoan mgi - he polime it set He dung dich khoan mdi co cac thong so ky thuat toi uu, cau true ben vCrng, dinh a nhiet cao, va dae biet phii hgp cho thi cong qua dia tang Oligoxen duOi va tang da mong nut ne ke ca trugng hgp co goc nghieng iOn (ign han 45°) He dung dich polime it set khong gay nhiem ban va lam hu hai doi vgi cac tang chda qua trinh khoan M6OAU Cdng tac thi cdng gieng khoan cd gdc xien Idn (gieng khoan ngang) da dugc ehinh thirc dua vao hoat ddng tai md Bach Hd ke ttr nam 1995 Mpt nht/ng yeu td dac biet quan trpng gdp phan vao cdng thi cdng cac gie'ng khoan ngang la viec ap dung dung cdng nghe dung djch khoan He dung djch polime phi set ANCO - 2000 da dugc dua vao sir dung cdng de thi cdng mdt sd gie'ng khoan cd gdc nghieng Idn han 45° qua cac dja tang Mioxen va Oligoxen md Bach Hd (GK 815,1010, 917, 919, v.v ) Tuy nhien, ben canh nhUng uu diem cd dugc, he polime phi set ANCO - 2000 cdn cd mpt sd mat han che, dd la: • d nhiet dp cao, cac polime bj phan hiiy nhanh, vi vay, de tri dn djnh cau true, he polime sir dung de xir ly qua trinh khoan se tieu tdn nhieu han, ttr dd dan den tang gia chi phi dung dich khoan • Khi thi cdng qua tang da mdng nirt ne, dung djch polime phi set khdng cd kha nang tao Idp vd set ngan each tren gie'ng khoan, do dung djch de bj tha'm mat vao via, mat khae, anh hudng rat manh bdi nhiet dp cao nen Idp vd bun xi mang hda tren gieng ed tinh tai xdp khdng dii kha nang han che, ngan ngira su xam nhap ciia dung djch hoae nude thai vao via, dan den hau qua anh hudng xau den tinh chat tham chira tu nhien ciia tang san pham Oe giai quyet nhiem vu dat cho viec thi cdng cac gieng khoan cd gdc nghieng Idn d tang da mdng va tang Oligoxen dudi, Vien NCKH&TK Dau bien da nghien ciru va dua vao ap dung he dung djch khoan mdi - he polime it set cd ham lugng pha ran thap 37 Hoi nghj KHCN 2000 "Nganh Dau Viet Nam trifdc them theky2r THANH PHAN PHA CHE VA CAC OAC TINH KY THUAT CUA HE DUNG DjCH POLIME IT bET He dung dich polime it set cd cac phan: set bentonit API, xanthanbiopolime, polimesihc hiru ca (KOR), caeboxyl metyl xenluld (CMC - HV), chat bdi tran, chat diet khuan Set bentom' API va xanthanbiopolime cd tac dung tuang hd lam tang dp ben cau true va dn dinh d nhiet dp cao, dan; bao cho dung dich cd tinh chat chay loang tdt, Caeboxyl metyl xenluld lam giam dd thai nude va lam tang nhdt bieu kien ciia dung dich khoan Phu gia bdi tran de giam ma sat giua bd khoan eg, dng chdng va gieng khoan Chat diet khuan nham ngan ngira va han che su phan rCfa vi khuan doi vcri cac hap chat gdc polime Tinh kiem va dd mdm cua nude dugc dam bao nhd KOH va NaHCO, Khae vdi he dung dich polime phi set, he dung dich polime it set, hgp chat polime silic huu ca ngoai tac dung ire che set tang tinh ky nude be mat dat da he, miin da khoan va cac pha dung dich, Cdng thirc hda hpc ciia polime silic huu ca dugc neu dudi day: R R Na - - [ - Si - - Al - - ] , - Si - R ONa R N = 9-15, R=CH3, C2H5hoacOC,H, Nhd su cd mat cua cac nhdm hydrocacbua no ma hao thu len be mat dat da hoae cac pha, Idp mang hap phu dugc tao cd be day khoang 3.10-^cm mang tinh ky nuoc [11, Ca che hap phu ciia cac phan tir polime silic huu ca len be mat vat the dugc md ta theo cac Hinh va Odng thdi, cung vdi cac nhom hydrocacbua no, cae nguyen tir silic va nhdm cua hgp chat polime silic hCru ca mang hap phu lam tang tinh ben nhiet ciia cac phan he dung dich, lam cho he dn djnh d nhi^t dp CEO den 200°C Hirh 38 Hpi nghi KHCN 2000 " Nganh Dau Viet Nam trifdc them theky 21' \\ W R Hinh Ben canh nhtrng uu diem ndi tren, lap vd set duac tao tren gieng rat mdng, dai, chac, cd dp tham nhd va hoan loan ky nude, Dac tinh ddng vai trd rat quan nhim gop phan han che su xam nhap cua nude thai dung dich hoae chinh dung dich khoan vao via dd giam thieu anh hudng xau den cac tinh chat tham ddi vdi dau eiia via, dac biet la ddi vdi cac tang dat da granit nirt ne, phi set Nhd cd tinh ky nude ciia polime silic hti'u ca va tinh ua nude tU trung binh trd len ciia cac mao dan thudc tang da granit nirt ne md Bach Hd [2] nen bj nuac thai xam nhap tren cac d'ng mao dan se duac phii bdi Idp mang ky nude, ngan ngira sutao nhO tuong dau - nude, Oieu rat quan trong qua tnnh goi ddng san pham, Cac dac tinh ky thuat nhan duac dieu kien phdng thi nghiem cd so sanh vdi he ANCO - 2000, he dung djch set va dung dich \ic che ky nude KR - 22 dugc neu d Bang Ket qua d Bang cho thay, cac thdng sd dung djch dat dugc, dae biet la tinh chat luu bien (irng luc cat tinh, luc cat ddng Yp, dp nhdt deo, v.v.,.) hoan toan phti hgp vdi yeu cau thiet ke dung dich cho thi cdng cac gie'ng khoan cd gdc nghieng Idn, Ngoai ra, dieu dd dang nhan thay d day la, he dung djch polime it set cd ty trpng rat thap: y = 1,01 ^ 1,03g/cm^ va chi sd doc d toe dd Gvong/phut (do bang may FANN - 35A) dat dugc tu -10 d nhiet dd 150°C thdi gian nung gid, Oay la thdng sd luu bien cd tam quan trpng dae biet, gdp phan lam sach gieng, ngan ngua hien tuang tao ldp miin set d cac khoang chieu sau cd gdc xien lan KET QUA AP DUNG DUNG DjCH POLIME IT SET TAI THLfC DjA Tren ca sd phan tich va danh gia cac ket qua nghien ciru thi nghiem, he dung djch polime it set da dugc dua vao ap dung thir nghiem de thi edng GK 428 md Bach Ho Mae dii dac diem dia chat va dieu kien thi cdng GK 428 rat phirc tap nhu qua tang da mdng nirt ne, thudng xuyen xay mat dung dieh tu ro ri den tram trpng nhiet dd day gieng cao den 160°C, gdc nghieng rat lan, d chieu sau 4448m gdc nghieng dat tdi 84° Song, vai cac thdng sd dung djch phii hgp va dn dinh nen qua trinh thi cdng da didn an toan va gieng khoan da dat den chieu sau thiet ke sdm han thdi ban so vdi du kien Cac thdng sd ky thuat ciia dung dich polime it set duoc neu Bang 39 Hoi nghi KHCN 2000 "Nganh Dad Viet Nam trifdc them theky 21' Bang 1: Cae thdng sd ky thuat cua dung djch thu nhan dugc qua trinh khoan Ten cac chi tieu Theo yeu cau thiet ke GK1011 Trpng lugng rieng, g/cm^ Op nhdt tuang ddi, s Op thoat nude API, ml Thirc te GK1010 GK428 GK1016 - 1,04-1,05 1,2-1,3 1,02-1,04 1,10-1,70 40-80 35-50 40-50 40-60 50-80 4-8 4-5 3,5-4,5 4-6 4-6 Cfng luc cat tinh, dyn/cm^ Sau phut 5-15 9-15 30-80 7-15 7-15 Sau 10 phut 15-20 13-20 50-100 12-28 15-30 *CNCT 25-30 30-40 10-20 30-40 D'ng luc eat dpng, YP,Lbf/100ft^ - 17-20 40-45 30-40 40-45 Ham lugng keo, % (theo the tich)