812 Mdt sd kgt qua nghign ciiu mdi vg chdng mat dung djch trong da mdng niii ne md Bach Hd MOT SO KET QUA NGHIEN CUtJ M 6 I VE CHONG MAT DUNG DICH TRONG DA MONG NlTT NE MO BACH HO Hoang H6ng LTnh XNLD[.]
812 Mdt sd kgt qua nghign ciiu mdi vg chdng mat dung djch da mdng niii ne md Bach Hd MOT SO KET QUA NGHIEN CUtJ M I VE CHONG MAT DUNG DICH TRONG DA MONG NlTT NE MO BACH HO Hoang H6ng LTnh XNLD Vietsovpetro TOM T A T Cung nhu cdc cdng ty ddu nu&c ngodi khoan da mdng tgi thim luc dia Viet Nam gap phdi khd khdn rdt Icm la mdt dung dich khoan trdm trgng, gdy dnh hudng xdu cho tdng sdn phdm, md vdn chua cd bien phdp ndo gidi quyit triet di Trong bdi bdo ndy, tdc gid trinh bdy nhirng nghiin cim gdn day tgi phdng thi nghiim dung dich khoan vi tampon chdng mdt dung dich dua trin thiit bi m&i, bd sung cdc logi vdt lieu m&i vd diiu kiin thi nghiim dugc md phdng gdn han v&i diiu kiin cua da m&ng nirt ni md Bgch Hd Trin co s& d&, lua chgn dugc don pha chi phu hgp di di xudt dp dung thu nghiim ndm 2005 MODAU cac e6ng ty khoan nuoc ngoai thi c6ng mong tai thim luc dia Viet Nam thuang gap mat tuan hoan toan phin Hg da ap dung nhilu bien phap ngan ngira va ching mit dung dich nhung dat hieu qua kh6ng cao Hien nay, hg ap dung ehii ylu la phuang phap "floating mud cap drilling" ("khoan dimg mu dung dich") (cua Ciru Long JOC, JVPC, v.v ) khoan kh6ng tuan hoan, ep nuac muli va miin khoan vao cac doi nirt ne [3], gay anh huong xiu dang kl cho ting san phim va kh6ng kilm soat dugc Tren co so ting hgp, phan tich cac tai lieu nghien cim, ap dung tampon tir truoc din cua XNLD Vietsovpetro [8, 9, 11, 13, 14] va cac c6ng ty nuoc ngoai dang thi c6ng khoan tren thim luc dia Viet Nam [12, 15], chiing t6i tiln hanh nghien cim b l sung vl tampon dua chu yeu vao cac loai vat lieu va thiet bi mai LlTA CHON LOAI VAT LIEU BIT NHET THICH HOP Ve CO* hat Tir nhieu kit qua nghien cim vl dac tinh nirt ne ciia da mong [4, 5, 10] va cac kit qua ap diing thir nghiem tampon [8, 11, 14] cho thiy, nhin chung kich thuoc eiia vat lieu ching mit dung dich phii hgp tai doi nirt ne la thuoc co hat vira (74 ^ 2000MKM) va co hat (< 74MKM) Cac kit qua nghien cuu vl ching mit dung dich [2, 12, 15, 6] diu khang dinh ring, viec ket hgp cac co hat kbac ciing mgt tampon se tang kha nang bit kin cac khe mit, hon nhilu so vai chi diing mgt loai ea hat Do do, chiing toi se sir dung cac co hat kbac (chii ylu thuge co hat vira va min) eiing mgt don pha che Tuygn tap bdo cao Hdi nghj KHCN "30 nam Dau Viet Nam: Cff hgi mdi, thach thiic mdi" 8j^ Ve loai vat lieu • • • Tren quan dilm bao ve ting san pham, cac vat lieu chii yeu dugc lira chgn phai e6 boa tann cao axit [10, 11, 14] Cac tai lieu nghien cim ve ch6ng mat dung dich [2, 15, 1,6] cting chi ring: Sir ket hgp nhieu dang vat lieu ch6ng mat dung dieh (cac dang: hat, sgi, vay) ciing mgt tampon se tang kha nang bit nhet khe nirt ban nhieu so voi chi diing mgt dang vat lieu rieng re Do do, cac don pha che se sir dung tir hai dang vat lieu tro len a Lira chpn vgt lieu dgng hgt Trong cac vat lieu dang thi carbonat canxi (CaCOs) la loai de boa tan axit nhat (toi 100%)) Nham tang t6c boa tan axit va giam ty trgng ciia CaCOi, de giam sa lang va giam ty trgng ciia tampon, chiing t6i da nghien ciiu CaCOs r6ng x6p (OBK) da dugc trinh bay mgt s6 bai bao khae [8, 10, 11] Theo ket qua nghien cim tai phong thi nghiem m6 hinh via thi tampon polymer it set voi ham lugng set < 4% van c6 h6i phuc tham cao (> 95%) sau xir ly axit [11, 14] Do do, phan vat lieu dang hat van can sir dung them mgt lugng nh6 set (< 4%) de tang ben cau tnic, ben nhiet, giam thai nuoc cho tampon [10] Ngoai ra, Nutplug - loai vat lieu ch6ng mat dung dich dang dugc nhieu c6ng ty khoan qu6c te ap dung ciing da dugc nghien ciiu b Lwa chon vdt Hiu dang vdy Sir dung CaCOs dang vay la ly tuong nhat, kha nang bit nhet vao nhieu loai khe niit va h6a tan axit cao C6ng ty MI da sir dung CaCOs dang vay nhan tao, nhung gia cao va ben co hgc kh6ng lan [15] Chiing t6i da tim vo so bo bien Vting Tau la CaC03 dang vay tu nhien, rat san co, gia thap va ben co hgc cao c Lwa chpn vgt lieu dgng sgi Trong nhom thi co sgi maema [15] la vira co kha nang bit nhet t6t, vira co hoa tan axit cao (toi 96%), nen se dugc lira chgn de nghien ciiu, thi nghiem Ngoai ra, Queak seal la loai vat lieu chong mat dung dich t6ng hgp dang dugc ap dung co hieu qua tai nhieu noi, ciing dugc nghien ciru cho dieu che tampon moi THIET BI NGHIEN ClTU VA DIEU KIEN MO PHONG M I • • Thi nghiem tren thiet bj "Permeability plugging apparatus" (My) Day la phuong tien hien dai xac dinh kha nang ch6ng tham cua tampon, dua tren nguyen tac do thai nuoc, nhung m6 phong gan hon dieu kien thuc te gilng khoan so voi cac may do thai nuoc thong thuong [14] Cu the la: Tai may "Permeability plugging apparatus", kh6ng dimg giay lge, ma dimg dTa ciing, rong x6p nhan tao [14] DTa khong dat day ma dat phan tren binh do, duoi tac dung ciia ap suat day, tampon se chuyen dgng tir duoi len, tao lofp vo bim tren bl mat dTa (tuong 814 Mdt so ket qua nghien ciiu mdi ve chdng mat dung djch da mdng nut ne md Bach Hd tu nhu o gieng khoan), nuoc thai se tham qua lop v6 bim va dTa chay ngoai Co the nang nhiet va ap suat gan voi dieu kien day gieng khoan Nhu vay, gm tri thai nuoc dugc se m6 phong gan diing dieu kien thuc te, tampon bit nhet vao doi mat dung dieh Thiet bi "Filter Press" (My) dytfc cai bien ve phirong phap De nghien eim kha nang bit nhet cua tampon, chiing t6i kh6ng dimg giay lge, ma de tampon tiep xiie true tiep voi tam luoi (kich thuoc 16 r6ng: 0,16 x 0,16mm), nham mo phong cho noi mat dung dich tram trgng (eo tham rat cao) Nham xac dinh thai nuoc tire thai cua tampon, chiing t6i tien hanh them FL sau thai gian phiit Ngoai ra, xong thai nuoc ciia tampon sau 30 phut (doi voi cae mau truoc va sau nung), tien hanh d6 tampon khoi binh do, gitr lai lop vo biin tampon tao nen va rot dung dich CMC (c6 don pha che: nuoc ky thuat + 0,3%)CMCHV; FV = 22 ^ 26") vao, de m6 ph6ng miic t6n that dung dich gieng, sau dai mat dung dich dugc bit nhet bang tampon Bang viec cai bien phuong phap nay, se cho phep xac dinh chinh xac hon kha nang ch6ng mat dung dich cua tampon Thi nghiem tren thiet bi "Acid tester" dieu kien via Day la thiet bi m6 hinh boa dugc sir dung de m6 phongve tham qua da he day gieng khoan Mau loi da mong nirt ne mo Bach H6 dugc dat binh giii mau ciia thiet bi Nang ap suat va nhiet tai binh tuong iing voi dieu kien day gieng Bom d6ng dau Keroxin tham qua mau voi chenh ap tuong tu noi xay mat dung dich tai dai mit ne, dugc tham K l Bom ep tampon vao nhtrng khe mit ciia mau, sau bom Keroxin vao miu, dugc thim K2 Sau xir ly axit (voi hon hgp axit vin thuong sir dung tai XNLD Vietsovpetro: 12% HCI + 3%HF + 0,5%PAV) d6i voi mau loi da dugc ep tampon vao cae khe mit, tien hanh bom dau Keroxin vao miu, dugc thim K3 Nho vay, xac dinh dugc kha nang bit nhet ciia tampon vao doi mit ne va kha nang phuc h6i thim ciia via sau xir ly axit Tom lai, bing nghien cim t6 hgp ba loai thilt bi: "Filter press" (co cai biin), "Acid tester" va "Permeability plugging apparatus", da giiip mo phong gin dung nhit kha nang ching mit dung dich dilu kien da mong mit ne ciia tampon nghien ciiu, tir lira chgn dugc don pha che tampon phii hgp CAC KET QUA THI NGHIEM Cac don pha che tampon va ket qua thi nghiem mau tien hanh chu yeu tren thiet bj do thai nyffc "Filter Press" Ket qua thi nghiem (thuc hien tren may "Filter Press") o nhung nhiet khae nhau, dugc trinh bay a Bang va Hinh 815 Tuygn tap bao c^o Hdi nghj KHCN "30 nam Dau Vift Nam: Cff hdi mdi, thdch thuc mdi' Bang DQ thai nuac (FL:ml) ciia tampon duac duai dp sudt 6.8 kg/cm' (100 PSI) Chi CO luoi (0,16 X 0,16mm), khong co giay IQC s Sau FL mdu Sau FL a T Dcrn pha che 25"C T 25"C: ra, giU vo Sau nung 150'C nung 150"C gia: bim rot dung dich gia giu vo bim rot dung dich CMC vao binh CMC vao binh r 7,5' 30' V 7,5' 30' r 7,5' 30' r 7,5' 30' - - - - - - - - - - - - CO 00 - 15 50 70 00 - - oo - 0,5 2,0 3,0 0,3 1,0 2,0 19 20,2 21,0 20 20,8 8,2 10 12,2 1,2 2,2 4,6 18,5 21,5 25,2 19,0 22 26 7,5 10,8 0,7 1,4 3,4 19 22 26 19,5 22,3 26,5 4,0 4,2 4,4 1,6 2,2 13,4 15,8 19,2 9,2 11,6 15,4 10 10,8 11 10 15,5 17 14,6 16,8 19,8 18,3 21,3 25,4 3,5 4,0 4,2 0,8 1,4 2,0 12,8 15,4 18,5 8,6 11,2 14,8 Nirac KT + 3% Bentonit API + 0,8% Xanvis (biopolymer) Nl + 5% scji maema + 10% vay vo so (1 + 5mm) Nl + 10%OBK (< USmm) + 5% vay vo s6 (1 -^ 5mm) 22 NKT + 4% Bentonit API + 0,8% Xanvis + 5%CaCg (< 0,9mm) + IO%CaCO, (< 1,25mm) + 5% vo so (1 +5mm) NKT + 4% Bentonit API + 0,8% Xanvis + 5%CaC0, (< 0,9mm) + 5%CaCg (< 1,25mm) + 5%CaC0., (3 ^ 5mm) + vo so (1 +5mm) NKT + 4% Bentonrt API + 0,8% Xanvis + 5%OBK (0,9mm) + 5%0BK (< 1,25mm) + 5% vo so (1 + 5mm) + 2% Nutplug (min) + 2% Nutplug (vua)+ l%KR22 NKT + 4% Bentonit API + 0,8% Xanvis + 5%CaCg (< 9mmH IO%CaCg (< 1,25mm) + 5% vo so (1 H5mm) + 2% Nutplug (mjn) + 2% Nutplug (vira) + 2% Queakseal (vira) NKT + 4% Bentonit API + 0,8% Xanvis + 5%0BK (< 9mm) + 5%0BK (< 1,25mm) + 3% Queakseal (vira) + 1% Queakseal (mjn) + 1% Nutplug (vira) + 1% Nutplug (min)+l%KR22 Ghi chii: OBK la carbonat canxi sieu nhe, ring xip; KR22 la polyme silic htiii co Mdt so kgt qua nghign cuu mdi vg chdng mat dung djch da mdng niii ne md Bach Hd 816 D • E)6 thai nuoc cua mau a 25"C Do thai nuoc cua mau nungl50"C,3gid Hinh 1: Do thai nu-ffc ciia cac tampon du'O'c tren thiet bj "Filter Press" chi co luoi loc, khong CO giay loc, ff nhirng nhiet khae Trong Bang dua mgt s6 ket qua ve nhiing th6ng s6 dung dich khae, a dieu kien nhiet phong thi nghiem va sau nung 150°C gio Bang 2: Thong so dung djch ciia mot so tampon thi nghiem Cdc thong so dung djch 25''C STT l50"C(3gia) Dan pha che FV PV YP GELi 10 FV PV YP gidy cPs Lb/IOOfr 117 16 44 00 50 00 GELi II) V^Vs V^Vi Lb/IOOfr Lb/IOOfr gidy cPs Lb/IOOfr 21/18 19/23 80 14 32 13/10 11/13 40 54/46 48/59 120 45 30 42/34 38/47 90 70 60/47 50/61 130 80 50 45/38 40/49 00 55 40 55/48 50/61 122 50 30 43/35 39/48 00 35 40 25/18 18/30 100 30 25 19/14 16/24 122 17 46 22/19 21/25 83 15 34 14/11 13/16 Nirac KT + 3% Bentonit API + 0,8% Xanvis Niroc KT + 15% Bentonit API + 0,6% Xanvis N2+I,2%PACLV Nz + 15%CaC03 (< 0,3mm) Nuac KT + 10% Bentonit API + 0,6% Xanvis Nirdc KT + 4% Bentonit API + 0,8% Xanvis 817 Tuygn tap bao cao Hdi nghj KHCN "30 nam D^u Viet Nam: Cff hdi mdi, thach thuc mdi' Tir cac kit qua tren chiing t6i co nhan xet sau: Qua cae ket qua thi nghiem eho thiy cac mau (theo thir tu) N8, N6, N7 la t6t nhat ve 6n dinh, bin nhiet, thai nuoc va kha nang h6a tan axit Nhiing miu va cac mau c6 don pha che thuoc loai tampon polymer it set tuong tu duge lua chgn dk tiep tue nghien eim tren may "Acid tester" va thiet bi "Permeability plugging apparatus" se trinh bay phan sau Cac don pha che tampon va ket qua thi nghiem mau tien hanh tren he thong may "Acid tester" Sir bien d6i phuc h6i tham eua mau loi da m6ng nirt ne sau bom tampon va xir ly axit dugc trinh bay Bang Bang Do Ifid m cua man loi md Do sdu Dan pha cite TT mdu loi Kl K2 K3 (m) md md md Sir giam Do phiic thdm sau Iwi thdm bam sail xu tampon ly axit % % Nude KT + % Bentonit API + 0,8% Xanvis + I5%0BK + 1%KR22 + 4204 529 505 100 95,5 4205 568 465 100 81.9 4367 306 2,7 30,8 99,1 lO.l 4057 503 41 252 91,8 50,1 4434 252 48,7 104.1 80.7 41.3 4123 212 3,9 41 98,2 19,3 4209 306 54 100 17,6 0,05%Na2CO3 Nuac KT + % Bentonit API + 0,6% Xanvis + 0,05%Na2CO3 +15%0BK Nude KT + 4% Bentonit API + 1%CMC- HV + 2% vo trau Nude KT + 0,8% Polyacrylamid + 8%CaC03 NucVc KT + 6%) Bentonit API + T/oCMC5 HV l%KR22 Nude KT + 8% Bentonit API + 1%CMC6 H V + I%FCI + 2%v6trau Nude KT + 10% Bentonit l%CMC-HV + % vo trau API + Nhdn xit: Mau Nl (tampon polymer it set) co phuc h6i tham cao nhat sau xir ly axit Mau N6, N7 la tampon set, v6 trau co phuc hoi tham thap nhat sau xir ly axit K6t qua nghien cim bin nhiet ciia polymer silic htiu co ky nuoc (KR22) dugc trinh bay Bang Mdt sd kgt qua nghien cuu mdi vg chdng mat dung dich da mdng nut ne md Bach Ho 818 Ban§ Thdng sd dung dich r Don pha che T T Gel FL FV PV YP sec ePs Lb/100ft" Nuoc KT + 0,05%Na2CO3 25 + 3% Bentonit API + 0,8% 150 Xanvis 4-15%CaC03 99 10 54 31 35 8,3 80 46 23 25 9,3 25 96 54 29 32 8,3 150 79 44 22 24 9,3 25 94 52 28 31 8,3 150 86 50 27 29 9,1 25 93 52 28 31 8,3 150 86 49 27 29 9,1 fC) Nl +KR22 0,5% N1+KR22 1,0% Nl +KR22 1,5%) Lb/lOOft^ r ml/30' 10' Nhgn xet: cac ket qua nghien cuu tren cho thay KR22 vai ty le thich hgp (1%)) lam tang ben nhiet ciia cac polymer kbac, tao sir 6n dinh ciia cac th6ng s6 dung dich tai nhiet cao (tren 150°C) Dieu rat thich hgp cho cac gieng khoan ngang tai da mong m6 Bach H6 Cac don pha che tampon va ket qua thi nghiem mau diro'c tien hanh tren thiet bj r f xac dinh kha nang chong tham cua tampon "Permeability plugging apparatus" tai nhiet va ap suat cao Tren co so nhirng ket qua thi nghiem cac mau dugc tien hanh tren hai loai thiet bi "Filter Press" va "Acid tester", da lira chgn dugc cac don pha che phii hgp, de tiep tuc kiem tra mau tren may "Permeability plugging apparatus" Ket qua thi nghiem dugc trinh bay Bang va bieu dien tren Hinh CQ Nl N2 N3 N4 N5 N6 N7 Hinh 2: Do thai nu-oc ciia cac tampon duffc tren thiet bj "Permeability plugging apparatus" ff nhiet va ap suit cao (120°C va 140kg/cm^) 819 Tuygn tap bao cao Hdi nehi KHCN "30 nam Phu Viet Nam: Cff hdi mdi, thach thuc mdi" Bang Do thdi nirac FL ml Ap Nhiet 5^7" sudt Tuc Dan pha che tampon kg/ thai; cm' Bm "C Tinh todn; Tieu chudn Be Bp (Sau 30 phut) Bp = Bm + 2Bc Nu-dc KT + Bentonit API 15% + Xanvis 0,6% + CaCOs (< 0,3mm) 120 140 15 2,5 20 120 140 16 3,5 23 120 140 7,8 2,0 11,8 120 140 4,2 5,4 15,0 120 140 6,0 8,0 22,0 120 140 3,6 5,0 13,6 120 140 5,0 3,2 11,4 15% Nuac KT + Bentonit API % + Xanvis 0,8% + 10% vo so (1 -=- 5mm) + 5%CaC03 (0,3 H- 0,9mm) Nuac KT + Bentonit API % + Xanvis 0,8% + 10% OBK (< 1,25mm) + 5% vd so (I -=- 5mm) Nude KT + 4% Bentonit API + 0,8% Xanvis + 5%CaC03 (< 0,9mm) + I0%CaCO3 (< 1,25mm) + 5% vo so (I H- 5mm) Nude KT + 10% Bentonit API + 0,6% Xanvis + 5% vo so (1 ^ 5mm) + ]0%CaCO3 (< 0,3mm) Nude KT + 4% Bentonit API + 0,8% Xanvis + 5%CaC03 (< 0,9mm) + I0%CaCO3(< 1,25mm) + 5% vo so (I ^ 5mm) + 2% Nutplug (vua) + 2% Nutplug (min) + 2% Queakseal (vira) + 1%KR22 Nude KT + 4% Bentonit API + 0,8% Xanvis + 5%0BK (< 0,9mm) + 5%OBK (< 1,25mm) + 5% vd sd (1-^ 5mm) + 3% Queakseal (vCra) + 1% Queakseal (min) + 1% Nutplug (vua) + 1% Nutplug (mjn) + 1%KR22 Ghi chu: Sir dung dia cung, r6ng x6p nhan tao: day 0,5cm; duong kinh 6,4cm Tir nhung kit qua tren, rut nhan xet nhu sau: 820 Mdt sd kgt qua nghien cuu mdi ve chdng mht dung dich da mdng nui nc md Bach Ho • Cac so lieu bang tren da chi rang, nhtrng miu (theo thir tu) N7 N3, N6 co ket qua thi nghiem t6t nhat dieu kien nhiet va ap suat cao Chiing t6i de xuat ap dung thir nghiem tampon N7, N6, N3 tai gieng khoan xay mat dung dich tram trong da m6ng • Tuy nhien, ap dung ngoai khoan truong, tren co so don pha che eiia mau N7, N6, N3, CO the bien d6i mgt phan don pha che de phii hgp voi dieu kien mat dung dieh tai gieng khoan KET LUAN Mau tampon dugc lira chgn qua hang loat ket qua thi nghiem tren cac thiet hi hien dai la phii hgp vai dieu kien da mong nirt ne mo Bach H6 Nhting tampon co ben cau true va tinh chay loang cao, ben nhiet, ty trgng thap, h6a tan axit eao va dac biet CO kha nang bit nhet t6t vao nhting dai mat dung dich Do do, giai phap se ch6ng mat dung dich c6 hieu qua va bao ve tang san pham nay, nang cao hieu qua kinh te, ky thuat thi c6ng khoan mong TAI LIEU THAM KHAO ByraTOB A., 1987 H/JoMioufee BC TaMnonajtcubie Mamepiicuihi MocKsa, He/ipa Crulov V.I., 1980 Ngdn chgn mdt dung dich cdc giing khoan sdu M Nedra Ngo The Duong, 2003 Floating mud cap drilling in fracturing granite basement at Cuu Long basin, block 15.1 Technical forum on Drilling Technology, Ho Chi Minh City, June, 2003 Tran Le D6ng, 1997 Dac diim phdn bd rdng khdng gian vd md hinh coleeto da mdng md Bgch Hd Tap chi Dau khi, S6 2, Ha Noi, 1997 Tran Le D6ng, Hoang Van Quy, 1998 Dac trung cdu true vd tinh chdt thdm chua cua tdng sdn phdm dd mdng md Bgch Hd Tap chi Dau ISSN 0866-854X, S6 5, 1998 B.H KpbiJiOB, 1980 HSOJIRIJUH no2Jiou(aiouiux ruiacmoe e 2Jiy6oKux CKeaDicunax MocKBa, He/ipa Hoang H6ng LTnh, 2000 Nghiin cu-u su liin quan giira ddc tinh nut ni v&i mirc mdt dung dich da mdng md Bgch Hd Bao eao Hgi nghi khoa hgc truang Dai hgc Mo -Dia chit lin thir 14, 11/2000 Hoang H6ng LTnh, 2000 Nghien cim gidi phdp phu hgp di chdng mdt dung dich tdng mdng md Bgch Hd Tap chi DIU 181/XB-BC, S6 4+5/2000, tr 59 - 64 Hoang H6ng LTnh va n.n.k., 2002 Ngdn ngira chdng mdt dung dich thi cdng cdc giing khoan tgi them luc dia Nam Viet Nam Bao cao Hgi nghi khoa hgc ian thir 15 truang Dai hgc Mo - Dia chat Ha Ngi, 2002 10 Hoang Hong Linh, 2000 Relationship between fracture characteristics of the Bach Ho basement rocks and lost circulation and a new more effective proposal to control lost Tuygn tap bao cao Hdi nghj KHCN "30 nam Phu Viet Nam: Cff hdi mdi, thach thuc mdi" 821 circulation in the reservoir" Conference on ''The oil and gas industry on the eve of the 21" century" Vietnam Oil and Gas Corporation Hanoi 2000, p 287 - 295 11 Hoang Hong Linh et al, 2003 Experiences in preventing and curing lost circulation in Bach Ho basement Technical forum on Drilling Technology, Ho Chi Minh City, June 2003 12 Anchor Drilling Fluids Vietnam J/V Co., 1992 Proposed lost circulation control for Vietsovpetro, Vung Tau n.HnnH MopHe4)Tera3 CH "BLeTCOBneTpo".(9w()eyz dypeuun aemopoe HHcmpyK^uR no mexHOJioeuu dypenuR CKeajfcuu e omjiojiceuuHx (pyndoMeHma npu UHmencueubix nozjioiqeHUHx dypoeoeo pacmeopa Byur Tay 1999 M.HnnH MopHe(|)Tera3 CH BbCTcoBneTpo Oxztejr 6ypeHHH aBxopoB OxHex no 6ypeHHH: "AnajiHS cyutecTByioutHx H BHezipeHHC HOBBIX xexHOJioruH CTpoHxejibcxBa,KaHJiHxajibHbix H xcKymux pcMOHXOB CKBa>KHH B c n BbexcoBnexpo" Bynr Tay 12 2002r 15.MI Drilling fluids Prevention and control of lost circulation-MI Co., 3/2001 ... nhiet va ap suat cao Chiing t6i de xuat ap dung thir nghiem tampon N7, N6, N3 tai gieng khoan xay mat dung dich tram trong da m6ng • Tuy nhien, ap dung ngoai khoan truong, tren co so don pha... vo biin tampon tao nen va rot dung dich CMC (c6 don pha che: nuoc ky thuat + 0,3%)CMCHV; FV = 22 ^ 26") vao, de m6 ph6ng miic t6n that dung dich gieng, sau dai mat dung dich dugc bit nhet bang... loc, ff nhirng nhiet khae Trong Bang dua mgt s6 ket qua ve nhiing th6ng s6 dung dich khae, a dieu kien nhiet phong thi nghiem va sau nung 150°C gio Bang 2: Thong so dung djch ciia mot so tampon