122 Nghien cdu de xuat doTi pha chi dung djch khoan gdc dau tdng hop de NGHIEN CUtJ DE XUAT DON PHA CHE DUNG DICH KHOAN GOC DAU TONG HOP DE KHOAN TANG MONG MO BACH HO VA CHO CAC GIENG KHOAN DONG BANG[.]
122 Nghien cdu de xuat doTi pha chi dung djch khoan gdc dau tdng hop de NGHIEN CUtJ DE XUAT DON PHA CHE DUNG DICH KHOAN GOC DAU TONG HOP DE KHOAN TANG MONG M O BACH HO VA CHO CAC GIENG KHOAN DONG BANG SONG HONG Ta Quang Minh, Le Thj Minh Tam, Biii Trudng Giang Le Trudng Thjnh, Ngd Thanh Mai, Nguyin Anh Phuang Cdng ty Dung dich khoan vd Hod phdm Ddu TOM TAT Dung dich khoan gdc nude dugc cho la nguyen nhdn gdy nhirng su cd khd khde phuc khoan mdng md Bgch Hd vd giing khoan a bdn triing Sdng Hdng nai cd nhicng dac diim dia chdt phirc tgp ddc trung Nghien cim vd lua chgn dung dich khoan gdc ddu tdng hgp Id cdn thiit nhdm ndng eao hiiu qud khoan khai thde ddu ciia cdc viing md ndy Dung dich khoan gdc ddu tdng hgp thi hien nhirng tinh chdt im viet ve dp bdi tron vd ire chi set, bdo todn tinh thdm chica ciia via, ldm tdng tdc dp khoan gdp phdn ldm gidm gid thdnh giing khoan Bdo cdo trinh bdy tdm tdt nhirng kit qud nghien cim phdng thi nghiem di dua mpt sd dan pha chi dung dich khoan gdc ddu tdng hgp cho khoan tdng mdng md Bgch Hd vd cdc giing khoan thupe bdn triing Sdng Hdng GIOT THIEU Mdt nhirng cdng doan quan trgng nhat cdng tac thi edng gieng khoan tham dd hoae khai thac dau la khau khoan md via san pham Cd nhieu yeu td quyet djnh den cdng tac md via san pham nhu tinh chat tham chiia ciia via, ap suat via, loai san pham chira via, chiing loai va chat lugmg cua dung djch, thdi gian md via va cac cdng nghe, thiet bi ggi ddng sau dd Dung djch khoan gde dau tdng hgp dang dugc cac cdng ty nude ngoai sir dung rdng rai cho khoan tim kiem tham dd va khai thac ma d nude ta chua cd mdt cdng trinh nghien ciiu nao mang tinh he thdng, vi vay, chimg tdi cho rang nghien cim sir dyng dung djch khoan gdc dau tdng hgp cho ddi tugng mdng Bach Hd va cac tang san pham d cac gieng khoan thuge ddng bang Sdng Hdng la rit cip thilt Tai md Bach Hd, mdt mat gradien ap suat via thap dj thudng, mat khae ting chiia san pham thudng bj nut ne cao, khoan thudng xay mat dung djch d cae mirc khae (1,59m den 80m^) gay tdn kem ve kinh te, thdi gian, can den nhumg bien phap khdng che phiic tap Ngoai viec giai quyet van de md via san pham, ddi vdi cae gieng khoan d ddng bang Sdng Hdng, dung djch khoan se dugc nghien ciiu ap dyng cho ca cac tao vdi dja tang ehira set nhay cam vdi nude nham dn djnh gieng, nang cao tdc khoan va gia gieng khoan Trong qua trinh khoan, cac dac tinh collector viing can day giing xau di la tac ddng ciia cac dung djch gdc nude dugc sir dung Dung djch khoan gdc diu dugc sir dung cang nhieu dap img cac yeu cau cang cao ve chat lugmg md via Tuyin tap bio cio Hgi nghj KHCN "30 nim Diu Viet Nam: Cff hgi mdi, thach thu c mor 123 san pham Thanh cdng nghien ciiu img dyng he nhii tuomg nghjeh dugc danh gia d: mirc bao tdn tinh chit di dudng ty nhien cua via, dai ty trgng dung djch, cac tinh chit luu biin - ciu tnic, dac tinh thim lge, cac dae tinh eiia cdng nghe khai thac va ca chi phi hgp ly Dau tdng hgp phai dap irng dugc cac yeu cau: • Khdng ddc va cd ham lugmg hydrocarbon thom thap • Do nhdt ddng hgc thap • Nhiet bit chay ldn ban 100°F (3 8°C) • Nhiet chay deo phai thap hon nhiet mdi trudng de de bom day • Diem anilin hon 65°C ed y nghia lam giam sy pha buy cac chi tiet duge che tao bang eao su • Khdng phat huynh quang Bang Tinh chdt vdt ly eua ddu parafin tdng hgp Trang thai Do nhdt: d 100°C d40°C Nhiet chay deo, "C Diem ddng dac, °C Nhiet bit lira, °C Ty trgng dung djch d 60°F (15,5°C) Diem anilin, °C Ham lugng chat ran (mg/l) Kha nang trdn lan vdi nude bien Thanh phan hda hgc Paraffin mach thang Tetradecene Ham lugng chat tham Nhiet sdi Bit diu sdi, "C Sdi cudi, °C DduMCP-1257C (ESSO-Mobil) DduEDC-95-Il (Total-Phdp) Chat long l,17cSt 2,71cSt -3 Chat long 3,5 cSt -27 124 779 kg/m^ 66 Khdng 814kg/m^ 91 55 H- 65% trgng lugng 15 H- 25% trgng lugng 0,003% 255 325 De cd dung djch khoan gdc dau tdng hgp dn djnh mdt khoang thdi gian tdi thieu theo yeu cau sir dyng thi nhat thiet can phai cd it nhat mot hoae nhieu chat hoat ddng be mat Can cii vao tinh hinh thj trudng va gia cua cac chit HDBM, chung tdi chgn he tao nhii gdm hdn hgp cac axit beo cd mach cac bon C14.17, cae amin (hay polyamin) va cae hdn hgp ciia chiing ciing nhu hdn hgp vdi cae chit thim udt nhu cac dan xuat cua 124 Nghien cdu de xuat don pha chi dung djch khoan goc dau tdng hgp de- amin va chat lam dac dan xuat tir cac dime, trime va imidazonline ciing nhu ca cac amin bae cao Chiing tdi xac dinh dugc ham lugng chat tao nhu tuong img vdi cac ty le D/N khae qua cac thi nghiem: Bang Ty le D/N 50.07; 60/40 70/30 80/20 Ham lugng chat tao nhu, % the tich 1,5 1,6 1,70 1,8 KET QUA NGHIEN ClTU DON PHA CHE DUNG DICH KHOAN GOC DTH CHO KHOAN TANG MONG MO BACH HO Ting mdng md Bach Hd nim d sau ldn (3000 -f 5000m), ap suit thudng cd gia trj 300 -r 400at, nhiet dao ddng 140 - I SOT Dudi tac ddng ciia cae ylu td (dac biet la nhiet cao), dung djch thudng bj loang (do cac polymer bj phan hiiy cau true), nen lam giam dang ke tinh chat luu bien ciia dung djch khoan Ap suit via ting mdng giam: qua trinh khai thac ap suat via giam xudng cdn 0,8 - 0,9, dd vdi dilu kien thyc tl ciia XNLD Vietsovpetro chi cho phep sir dung dung djch gde nude cd ty trgng ldn hon lam chenh ap suat giira cdt dung djch va via rat ldn, dung djch dl di vao via theo cac ddi nirt ne, gay tdn thit dung djch va anh hudng xau din via san phim Sy chenh lech ap cung se cang tang qua trinh khai thac md, nen mat dung djch tang mdng nirt ne se cang tram trgng Thanh phin thach hgc da mdng khdng ddng nhat, xen ke nhumg ddi da ran chac la nhirng ddi da de bj dap vd, tao cac ddi nirt ne nam xen ke giiia cac khdi da ran chac, dac xit Chinh he thdng khe nirt, hang hde day dac, va sy lien thdng giira cac Id hdng, khe nirt da dan den sy cd mat dung djch rat tram trgng tai day Bang 3: Cac tinh chat co ban dung djch goc DTH (THBH) duoc de xuat Thanh phan DauEDC95-ll,m' Chat tao nhu, lit Chat on djnh nhu, lit Chat tham uat, iit Set huu ca, kg C.giam thai nude, kg Ca(0H)2, kg Nuac bien, in" CaClj (0 - 39%) p, g/em' BaSOVCaCOj Ham lugmg, tinh cho Im' D/N: 60/40 0,54 16 8,6 2,86 11 13 16 0,36 0-246 0,89 D/N: 70/30 0,656 17 5,72 22 12 17 0,27 0-199 0,87 D/N: 80/20 0,745 18 8,58 5,72 23,5 12 18 0,19 0-143 0,85 1,04 0,93 0,99 p>l,04 p>0,99 p>0,93 YP Gel (lb/ (lb/ lOOft") lOOft") P (g/cm'') FV (s) PV (eP) 0,9 40 13 11 1,15 50 32 22 8-20/ 17-53 FL (cm') ES (von) 330 1370 125 Tuyin tap bio cio Hgi nghj KHCN "30 nim Dau Viet Nam: Ca hgi mdi, thach thde moi" Bang 4: Danh gia kha nang chju nhiem ban ciia THBH voi ty le dau nude 60/40 AV PV YP Gel rpm ES TKN 24,5 19 11 7/14 MOV SKN 29 22,5 13 7/17 220V 20ml Md phdng chat ran 56 34 34 13/31 13 200V - Nude bien 38 30 16 8/19 152V - Mudi Carnalite 36 28 16 7/18 113V - Mdu Mau nen: FL @250"F Ghi chu: TKN: trudc nung mdu a I21°C thdi gian 16 gid SKN: sau nung mdu a nhiet dp 120°F (49°C) Bang : Ket qua thi nghiem danh gia phijc hoi tham cua dung dich THBH Dp bdo Dp thdm Dp thdm ddu He sd hod ban ddu sau tdc dpng phuc hdi eua DDK(k2) dp thdm nude, (kl), mD mD % (k2/kl) Logi dung dich khoan Sd hieu mdu THBH 80/20 BH- 426.7-9 Tl 4203 1,4 13,5 516 454 0,88 THBH 70/30 BH- 446.6-3-73 3986 3,9 19,3 184 164 0,89 THBH 65/35 BH-406.4-18 4206 2,9 17,3 189 166 0,88 THBH 60/40 BH-425.1-18 3831 3,1 15,4 191 162 0,85 THBH BH-425.2 4-104 4500 55/45 3,0 19,7 357 293 0,82 THBH 50/50 2,8 21 433 346 0,80 T T BH-901.4-2-22 Chieu Dp sdu, rdng m % 4253 Tang mdng la tang chiia san pham dd dung djch khoan gdc DTH dugc sir dyng khoan md via san pham De ed anh hudng it nhat, bao toan tinh chat eoleetor va phii hgp vdi dieu kien dja chat mdng, dung djch gdc dau phai la he nhii tuong ben, chju nhiet den 150°C va cd ty trgng nhd de tao ap suat edt thuy tinh tuong duong vdi ap suat via Viec lya chgn dung djch khoan gdc DTH se dap img tdt ve tinh bdi tron, chju nhiet va dieu chinh ap suat edt ap dung djch can bang ap suat via, vi vay^segiam mat dung djch tuan hoan Dieu chinh ty trgng ciia dung djch khoan gdc DTH dugc thyc hien bang viec dieu chinh ty le D/N hay bang ham lugmg mudi ciia pha nude Trong khudn khd ciia bao cao chiing tdi chi cd the gidi thieu don pha che dung djch THBH tren loai diu paraffin tdng 126 Nghien cdu de xuit doTi pha chi dung djch khoan gdc diu tdng JTg£Jg::i hgp EDC-95-11 Viee nghien ciiu tren dau nen cd nhdt thip bom MCP 1257C chi cd tinh chit tham khao va viec tim tren thj trudng khd ban Chung tdi tiln hanh thi nghiem xac djnh kha nang chju nhiet va nhiem ban eua THBH 60/40, ty trgng 0,97g/cm-' theo each them chit rin khoan md phdng d miic nhilm bin 10% trgng lugng vao biin, trdn deu, nung ndng mau d 121°C (250°?) 16 gid mau Kit qua cho thiy cac mau THBH ty le D/N: 65/35, 70/30 va 80/20, cd gia trj he so phye hdi tham cao Nhu vay, viec nghien ciiu ap dyng dung djch THBH chiing td phii hgp vdi cae dieu kien ciia mdng md Bach Hd, dac biet kha nang pha chi dung dich cd ty trgng nhd (gradien ap suit nhd hon I) tao cdt ap can bing vdi ap suat thap ciia mdng niit ne md Bach Hd Dilu khdng thi thye hien dugc ddi vdi cac he dung djch khoan gdc nude KET QUA NGHIEN ClTU DON PHA CHE DUNG DICH KHOAN GOC DTH CHO KHOAN GIENG KHOAN THUOC BON TRUNG SONG HONG (THSH) Nguyen nhan anh hudng din ggi ddng.- ddi tugng chiia dau ciia mien vdng Ha Ndi la cac tap eat ket Oligocen va Miocen, thudng xen ke vdi cac ldp bdt ket mdng, ham lugng xi mang set - carbonat cao nen cd rdng, tham kem den trung binh Tang chiia Oligocen va Miocen dudi ed sy gan ket bdi xi mang set, carbonat Cat ket thudng la lithic hoae lithic - arko vdi phan manh set < 15%), xen ke cac ldp than va via than mdng Tang chira Miocen giira, cat ket gan ket yeu, xi mang gan ket ehii yeu la set dd phan chinh la cao lanh va cd mat montmorillonit Da chiia eat ket diep Phil Cir chat xit Thanh phan ciia xi mang chii yeu la thuy mica, cao lanh va it hon la clorit Mirc chira clorit tang tuong ddi ve phia Tay Nam ciia mien vdng Diep Phong Chau xi mang ciia cat ket la cao lanh set, ddi chd la canxit va cd chiia dxyt sat Sy cd mat cua khoang set anh hudng ldn den tham va rdng ciia da chiia, nhat la qua trinh tiep xuc vdi dung djch khoan gdc nude Cac khoang set deu cd dac tinh ua nude dugc bieu hien d bai dae tinh hydrat hda truong nd (nhu cac khoang set montmorilonite, hydro clorit, v.v ) va tinh phan tan Dac tinh truang nd cua set bieu hien d chd set hydrat hda tiep xuc vdi nude lam co that va bjt kin kenh dan Dac tinh phan tan ciia set bieu hien d chd cae hat set mdi trudng nude bj phan tan eae hat co sd cd kich thudc cd micron, de dang djch chuyen theo ddng chay va tich dgng d nhiing vj tri "ed chai" eiia kenh cho den lam tac ddng chay Day cd the duge cho la mdt nhirng nguyen nhan chinh anh hudng den edng tac ggi ddng ciia cac giing khoan MVHN Nd dat cho viec nghien eiiu ap dyng he dung djch khoan phai lic chi tot khoang set va cd tinh hoan nguyen ddi vdi via chira san pham, khae phye tinh ua nude cua cac khoang set Xac djnh khoang hoa mudi ciia mau loi set ket Khi dung djch khoan THSH tilp xuc vdi da philn set, hien tugng thim thiu xuit hien thudc vao khoang hda cua dung dich THSH va cua da phien Tinh ire ehi chi 127 Tuyin tap bio cio Hgi nghj KHCN "30 nim DJu Viet Nam: Cff hgi mdi, thach thde mdi" thi hien khoang hoa eiia dung djch va cua da phien set can bang Thi nghiem xac djnh khoang hda ciia da phien set d gieng khoan ddng bing Sdng Hdng cd thi dugc diing de xac djnh ham lugng mudi CaCl2 can thiet cho dung djch THSH Do khoang hda cua cac mau da phien set thude tang chan Mioxen ciia viing triing Sdng Hdng d khoang 20% - 25%) Dung djch THSH cd tinh chat lie che set tdt dugc diing de khoan md via va khoan qua tang chan phia tren • Caa2 5% • Caa2 20% •CaC12 10% CaC12 25% •CaC12 15% • CaC12 30% Hinh 1: Kha nang thu hoi cutting vdi cac dung djch co nong CaCh khae Thanh phan eiia dung djch THSH duge de xuat cho khoan md via cho gieng khoan bdn triing sdng Hdng dugc dua d Bang Bang 6: Thanh phan va tinh chat ciia THSH cho khoan md via san pham Thdnh phdn Hdm licgng, tinh cho Im^ D/N: D/N: 70/30 75/25 Diu EDC 95-1 l,m^ 0,57 0,61 Chat tao nhii, lit 17 17,5 Chat dn dinh nhii, 8,6 8,6 lit 5,7 5,7 Chat tham udt, lit 17 17,5 Set hiru co, kg 11,5 11,5 C giam thai nude, 17,5 17 kg 0,242 0,21 Ca(0H)2, kg 92 75 Nude, m^ 600 620 CaCb (20%), kg Barit/CaCOs, kg D/N: 80/20 0,65 18 10 5,7 18 11,5 18 0,17 60 640 P g/ cm FV PV YPlb/ s cP lOOft^ 1,2 45 20 14 Gel FL lb/ cm lOOft^ 8-22 / 1,44 55 39 25 9-72 ES V 560 150 128 Nghien cdu de xuat don pha che dung dich khoan goc dau tdng hgp o^- Kha nang lie chi cua dung dich THSH doi vdi mau loi set kit dja ting mien vong Song Hdng Phucmg phap duge ap dung d day la thi nghiem tinh hoan nguyen ciia set Phuong phap dya tren co sd danh gia bao toan cac hat set sau cho mau tiep xiic vdi cac dung djch khoan cd cac phin khae Ty le cutting duge thu hdi sau thi nghiem cang cao va ty le phin ed hat ldn cang cao thi anh hudng ciia dung dich len miu cutting cang nhd - dung djch cang cd tinh lie che Cae dung djch khoan dugc sir dung la: - Dung djch nhu tuong nghich THSH - Dung djch ANCOo 4000 (PHPA/KjSOVpolyme/Glycol) - Diu nIn EDC-95-11 (dugc coi la dung djch lic chi tot nhit) - Nude (lie che kem nhat) Ty le thu hdi cutting doi vdi dung djch THSH la 95%) Idn hon so vdi 68,9%) ddi vdi dung dich ANCO 4000 Phin cd hat to thu dugc cung nhilu hom 85,9%) so vdi 55,1%), chi it hon diu nIn EDC-95-11 dat 99,1% Trong dd, ddi vdi nude la 0% Dung djch THSH cd tinh lie ehi tot hom nhilu so vdi ANCO 4000 KI) ô)ã lO ô)ã 7) E fl) -o 5) 4) Ji ?IU H 2) 10 0 1.5 i).5 15 :' ;v5 Cff la mju till Ivi (mri Hinh 2: Dvdng cong thu hoi cutting doi vdi cac he dung djch khae Bang 7: Ket qua thi nghiem cac don pha che dung djch khoan goc DTH sir dung cho cong doan l/2inch cua gieng khoan d dong bang Song Hong vdi cac ty If D/N khae Thanh phan dung dich Ty le D/N 80/20 70/30 Ty trgng 1,2 g/cm^ 1,32 g/cm^ 1,44 g/cm^ 1,32 g/cm^ 1,44 g/cm'' Diu EDC-95-1 l,m^ 0,570 0,568 0,543 0,646 0,62 Nude, m^ 0,252 0,252 0,242 0,16 0,16 Chat tao nhii, lit 17 17 17 18 18 C dn djnh, lit 10 10 8,6 8,6 8,6 5,72 5.72 5,72 5,72 5,72 Chat tham udt, lit Tuyin tap bao cao Hgi nghj KHCN "30 nam Piu Viet Nam: Co hgi moi, thach thde moi" 129 Chat giam thai nude, kg 11,45 11.44 11,45 11.45 11.44 Set hiiu ca, kg 15.73 15,7 12 14.3 17.2 17 17 17 18,6 18 Barit-DMC, kg 442 442 596 486 639 CaCb kg 91.5 92 88 60.4 58 Ca(0H)2, kg Thdng sd dung dich 56/36 68/43 67/42 63/40 64/40 PV 20 25 24 23 24 YP 16 18 16 17 16 Gel 12/21 10/27 13/29 8/9 9/30 ES 580 680 620 800 860 HTHP FL 3,2 L4 1.4 1.2 V 600/300 60/37 91/56 79/47 74/46 85/51 PV 23 35 32 28 34 YP 14 21 15 18 17 Gel 11/44 16/55 20/52 13/50 22/73 ES 950 1320 1000 1500 1375 HTHP FL 4.0 2 1.6 1.8 V 600/300 TKN SKN Bang 8: Danh gia kha nang c hju nhiem ban ciia THSH Ty le D/N 1,2g/cm^ 1,2g/cm^ l,32g/cm'' 1.44g/c m"' l,44g/ EDC95-ll.m^ 0,51 0,606 0,58 0.54 0.54 Nude nggt, m^ ' 0,36 0,263 0,25 0,24 0,24 Chat tao nhu, lit 16 17 17,2 17,2 18 Chat dn djnh, lit 5,72 6 8.6 Chat tham udt, lit 2,9 2,86 5.7 Chat giam thai nude, kg 11,5 11.5 11,5 11,5 11,5 Set htm CO chju nhiet, kg 7,2 14,3 13 14,3 21 Ca(0H)2, kg 11,5 17 13 14,5 18 Barite kg 280 293 449 623 619 CaCL kg 96 96 92 88 63 Ty trgng Thanh phan dung dich 80/20 70/30 60/40 130 Nghien cdu de xuit don pha chi dung dich khoan goc diut6ngJigjJjj£:i Thdng so dung dich 64/41 56/36 55/35 65/42 64/40 PV, cP 23 20 20 23 24 YP, Ib/lOOsqft 18 16 15 19 16 Gel 0/10, lb/1 OOsqft 13/20 12/21 9/16 16/26 9/30 ES, V 400 580 450 530 860 HTHP FL, ml 1,7 2,8 1,6 1.4 V 600/300 Khdng nhiem ban 87/57 80/52 167/101 80/52 PV, cP 30 28 66 28 YP, lb/1 OOsqft 27 24 35 24 19/24 22/29 38/41 28/44 ES,V 340 450 310 970 HTHP FL, ml 3,4 1,8 2,6 V 600/300 Ldn 72/44 85/46 74/44 PV, cP Ldn 28 39 30 YP, lb/1 OOsqft Ldn 16 14 Gel 0/10, lb/1 OOsqft Ldn 13/23 15/26 10/29 ES, V 110 130 300 330 HTHP FL, ml 4,6 2,2 V 600/300 10% nude 10% set ket Gel 0/10, lb/1 OOsqft V 600/300 10% set OCM A 95/61 90/59 95/63 89/59 PV.cP 34 31 32 30 YP, lb/1 OOsqft 27 28 31 29 17/20 18/27 23/36 27/42 ES,V 60 140 240 590 HTHP FL, ml 2,4 2,4 1,4 2,2 85/46 74/44 PV,cP 39 30 YP, lb/1 OOsqft 14 Gel 0/10, lb/1 OOsqft V 600/300 10% chat ran khoan Gel 0/10, lb/1 OOsqft 15/26 10/29 ES,V 300 330 HTHP FL, ml 2,2 Ket qua nghien ciru dung djch khoan gdc dau phong thi nghiem da trinh bay d tren cho thay: • Thanh phan va tinh chat cua dung djch THSH dugc dua la co sd dl pha che va dieu chinh qua trinh sir dung Thi nghiem kha nang dung nap cac chit phdng thi nghiem cho thiy dung djch THSH cd kha nang chju tat ca cac nhilm ban thudng gap Dung djch ty le D/N: 60/40 chi dugc khoan vdi tao chira it set, cd mirc ham lugng dit da khoan phan tan dung djch nhd han 10% va ty 131 Tuyin tap bao cao Hgi nghj KHCN "30 nam Dau Viet Nam: Co hoi moi, thach thde moi" trgng khdng ldn ban l,2g/cm'' • Kha nang lie chi dat 99.7%) ciia dung djch THSH tren cac miu ldi set kit cho thay uu diem ciia dung dich THSH vdi gia trj ham lugng khoang hda ciia mau ldi set ket dugc xac dinh phii hgp Da chiia d bdn triang Sdng Hdng cd rdng, tham nhd va phan thach hgc cd chira khoang set, dudi tac ddng cua dung djch THSH khdng bi hydrat va truong na THSH cho ket qua phye hdi tham rat tdt Ket qua danh gia cd y nghla quan trgng de cai thien kha nang ggi ddng ve sau Bang 9: Ket qua thi nghiem danh gia khii nang phuc hoi tham ciia THSH voi cac ty le D/N 60/40, 70/30 va 80/20 tren mau loi mien vong Song Hong Sd hieu mdu Chieu ddi cm Dp Dg Duong kinh, thdm rdng cm khi, mD % MD mD Logidd khoan 626,9 457,6 K2 ILe sd phuc hdi thdm (krh) 5,99 3,72 932,1 22,6 ANCO 4000 0,73 75-1087 5,42 3,78 1365 19,87 915,8 796,76 THSH 60/40 0,87 34-1014 6,93 3,76 303,7 18,96 206,4 187,84 THSH 70/30 0,91 1007 5,72 3,76 184,7 20,87 128,9 116,01 0,90 THSH 80/20 Ket qua cho thay kha nang phuc hdi tham ciia dung djch gdc DTH cao han so vdi dung djch polyme gdc nude da dugc sir dung d ddng bang sdng Hdng (0,73 so vdi gia tri thap nhat 0,8, cai thien dugc 15%; va 0,91 cai thien 21%) Danh gia kha nang boi tron ciia dung djch khoan gdc DTH Viee danh gia kha nang bdi tron cua dung djch khoan dya tren nguyen ly sy giam ma sat tren may do nhdt EF Electronical Lubricity Tester-FANN cua phdng thi nghiem DMC va tuan theo chi tieu ky thuat RD 2002 ciia Vien NIPI - XNLD Vietsovpetro 0.9 0.8 0.7 0.6 0.5 0.4 0.3^ 0.2 o.H Distil Water DD ben TH2 50/50 TH2 60/40 TH2 70/30 TH2 80/20 Hinh 3: Bieu kha nang boi tron ciia cac dung djch khae (Chii y: TH2 - ky hiiu ciia dung dich gdc ddu paraffin tong hgp) 132 •Jghien cdu de xuit don pha chi dung djch khoan goc d a u j o ^ g j l g j l j g : : ! Ket qua thi nghiem the hien tren so dd cho thiy dung djch khoan tren nen DTH paraffin d cac ty le D/N khae deu cd gia tri he sd ma sat rit nhd va thip hon so vdi dung djch tren co sd bentonit tir 66% den 71%, gia trj ciing nhd hon so vdi dung djch khoan polyme/PHPA/K2S04/Glycol Nhu vay, kha nang bdi tran ciia dung dich gdc DTH tdt ban han tat ca cac dung djch da dugc sir dung Danh gia doc hai ciia dung djch khoan goc DTH ddi voi moi trudng Bang 10: Danh gia doc hai ciia THBH va THSH Sinh vdt thi nghiem Au triing tdm su {Penaeus monodon) Vi khuan phat quang {Photobacterium Phosphorum) Thdi gian 96 gid phut 15 phut Chi lieu xdc dinh LCjo (ppm-SPP) EC50 (ppm-SPP) EC50 (ppm-SPP) Chdt thu nghiem THSH THBH KsCrzOy 264.430 248.706 14,7 753.796 786.054 119,0 692.562 774.440 109.0 Ddi vdi au triing tdm sii, LC50 > 30.000ppm dugc quy djnh khdng ddc hai; LC50 < 30.000ppm la ddc Nhu vay, cac dung djch khoan tren cac dau nen parafin tdng hgp la khdng ddc (THSH va THBH la dung djch khoan gdc DTH dugc pha chi tren loai diu nen parafin tdng hgp cd phan doan sdi khae nhau) KET LUAN • Da lya chgn loai dau parafin tdng hgp lam pha diu nIn cd ty trgng tuong irng la 0,779 va 0,814, nhdt ddng hgc 2,71cSt va 3,5cSt (d 40"C), cd phin hda hgc va cac tinh chat vat ly dat yeu ciu an toan vl chay nd va sire khoe • Thiet lap don pha chi dung djch THBH cd ty trgng nhd hon Ig/cm' dl tao cdt ap dung djch phii hgp vdi ap suat thap di thudng cua mdng, nhim giam tdi thilu mat mat dung dich vao mdng Ty trgng ciia dung djch THBH dugc dilu chinh bing ty le D/N (ham lugng thi tich pha nude) va ham lugng mudi CaCL cua pha nude • Ham lugng mudi CaClz thich hgp ciia pha nude la 20% trgng lugng Ty trgng dung djch THSH dugc dieu chinh bing barit hay CaCOj Kha nang uc chi khoang set ciia dung djch bing thi nghiem kha nang thu hdi mau Idi vun cao hon so vdi cua dung djch polyme/PHPA/KsSOVGIycol la 26% cho thiy kha nang bao toan tinh tham chiia ty nhien ciia via chira va kha nang dn dinh giing khoan ciia THSH rit eao • Xac djnh dugc kha nang bdi tron ciia dung djch khoan gdc dau tdng hgp: he so ma sat ciia DTH giam mdt each tuang ddi thap hon so vdi dung dich set bentonit va thap nhat dat 72% dung dich khoan polyme/PHPA/K^SO /Glycol thip nhit la 33% Tuyin tap bao cao Hgi nghj KHCN "30 nam Dau Viet Nam: Co hgi mdi, thach thde moi" • 133 Kit qua danh gia ddc hai theo chi tieu LC50 d 96 gid va EC5y cua THSH \ a •THBH cho thay cac dung djch khdng ddc hai Kha nang phan huy sinh hgc cua THSH dat 68,21% va THBH 58,42% TAI LIEU THAM KHAO \ Tdng cdng ty Dau Viet Nam, 2000 Hdi nghi Khoa hgc cdng nghe 2000 "Ngdnh Ddu truac thim thi ky 2r Tap I, II NXB Thanh Nien, Ha Ndi Tdng cdng ty Dau Viet Nam, 1998 Cdc quy dinh ve bdo vi mdi truang chi biin ddu khi, thdm dd khai thde, phdt triin md, sdn xudt, bao qudn, van chuyen gia cdng vd dich vu NXB The Gidi, Ha Ndi Trung tam Nghien cim Phat trien An toan va Mdi trudng Dau khi, 1999 Hdi thao mdi trudng " Vi viec sir dung dung dich khoan gdc ddu khodng vd goc ddu tdng hgp a biin Viet Nam'\ Ha Ndi, 28-4-1999 Nguyen Dire Huynh, Hoang Thai Lge, Hoang Nguyen va n.n.k., 1998 Nghien cim dnh huang ciia viec sic dung dung dich khoan gdc ddu cd dp dpc thdp ddi vdi mdi trirang biin Viet Nam Tap chi Diu khi, Sd 1/1998 Truang Bien, Tran Dinh Kien, Le Van Thang, Lam Thanh Phudc, 1997 Dung dich khoan tdng hgp - Mpt tiin bp mai cdng tdc khoan ddu Tuyen tap cac cdng trinh khoa hgc Dai hgc Md - Dja chat, Tap 25, thang 10-1997 J.E Friedbeim, 1997 Second-generation synthetic drilling fluids JPT, July 1997 John A Veil, Christopher J Burke, David O Moses, 1996 Synthetic-based muds can improve drilling efficiency without polluting Oil & Gas Journal Mar 1996 D.F Jacques, H.E Newman Jr., W.B Turnbull, 1992 A comparision of field drilling experience with low-viscosity mineral oil and diesel muds proceedings Drilling Conference New Cleans lADC/SPE 23881, p 341 - 354 George R Gray, H.C.H Darley, 2000 Composition and properties of oil well drilling fluids'" Production Pperation Overview March 2000 10 Mercer et al., 1992 Oil-base drilling fluid comprising branched chain paraffins such as the dimer ofl-decene United States Patent 5096883, March 17 1992 ll.Patel et al., 1993 Oil based synthetic hydrocarbon drilling fluid United States Patent 5189012, February23, 1993 ' ... duge de xuat cho khoan md via cho gieng khoan bdn triing sdng Hdng dugc dua d Bang Bang 6: Thanh phan va tinh chat ciia THSH cho khoan md via san pham Thdnh phdn Hdm licgng, tinh cho Im^ D/N:... he dung djch khae Bang 7: Ket qua thi nghiem cac don pha che dung djch khoan goc DTH sir dung cho cong doan l/2inch cua gieng khoan d dong bang Song Hong vdi cac ty If D/N khae Thanh phan dung. .. Hd Dilu khdng thi thye hien dugc ddi vdi cac he dung djch khoan gdc nude KET QUA NGHIEN ClTU DON PHA CHE DUNG DICH KHOAN GOC DTH CHO KHOAN GIENG KHOAN THUOC BON TRUNG SONG HONG (THSH) Nguyen nhan