ri.'i^.'fl 4? -It THAM DO - KHAI THAC DAU KHi NGHIEN CUU, D A N H G I A TRANG THAI O O N G HOC B O DUNG CU KHOAN DUONG KINH NHO TRONG MONG NUT NE MO BACH H ThS Nguyen Van KhUcfng', TSKH Tran Xuan Dao^ KS Nguyen Thanh TrUcmg' 'Tdp dodn Dau Viit Nam 'Lien doanh Viet - Nga "Vietsovpetro" Email: khuongnv@pvn.vn Tom tat Viec phdt bien thdn ddu tdng dd mdng nUtni dd mdra kji nguyen mdi cdng tdc tim kiem, thdm dd va khai thdc ddu Do cdu true dja tang cua mo Bach Ho khd phdc tap, vdi sU hiin dien cua tdng trdm tich Oligocene tren cd dp suat via dj thudng cao nin de khoan duac doi tUpng mong cdn phdi cd cap ong ehdng 7" cdch ly dja tang Oligocene ndy, tUdo sUdung choong khoan vdi cap dUdng kinh 6V2".Sau mdt thdi gian ddi khai thdc, cdc gieng khoan vdo doi tUcfng mdng bf ngap nUdc, sdn lUcfng khai thdc qud thap vd khdng hiiu qud Do viec khoan gieng mdi khong khd thi ve hieu qud kinh te, nin de ddm bdo sdn lUOng khai thdc vd ndng cao hi so thu hoi ddu, cdn tdn dung cdc thdn gieng hiin ed (gieng khdng hoat ddng hay hoat ddng kem hieu qud) de khoan cat thdn, cho phep mdrdng cdc khu vUc chua cd gieng khoan hoac viing bj tdch biet mUc nUdc ddng tin khdng dong nhdt qud trinh khai thdc Do thi cdng tren cdu trdc cda gieng khoan cu, edn sddung chodng khoan dUdng kinh nho den AVi" de khoan vdo ddi tupng mdng Viec nghien cdu, ddnh gid trang thdi ddng hpc cda bp dung cu khoan dudng kinh nhd (dudi 7") tdng dd mdng ndt ni se giup ndng cao hieu qud cOa cdng tdc khoan Tdkhda: Chodng khoan, bg dung cu khoan, thong so che khoan, phd hdy dot da, trang thdi ddng hoc Gidi thieu gieng khoan BH-11 va mau vun gilng khoan 12001 cho Md Bach Ho nam t r l n ddi nangTrung tam be Cdu Long va da dupe Lien doanh Viet - Nga "Vietsovpetro" khai thIc thIy sU phat trien da cd phan kiem la diorite, vdl dac trUng tham chda thap tU nam 1986 Lat c i t dja chat md Bach Hd gdm da mdng M l u Idi gieng khoan khai thac 1113 cho thIy ddp slu ket tinh tuoi trUde DeTam va da tram tfch luc nguyen (Hlnh 4.900m (-4.375m tuyet ddi) cd sU chuyen tiep t d phUe he 1).Tdng chieu day theo chieu thiing ddng md vao da mdng da granite sang da cd phan kiem la 1.990m, ciia da tram tfch la 4.740m (BH-11) Thanh phan vat chat va eau true ciia da mdng theo Mdng la 6a magma ket tinh hoan toan vdi cac dai mach mau Idi tai cac gieng khoan duoc trinh bay BIng 1, poefirit va diabaz andesite bazan phan anh tfnh bat ddng nhat thach hpc.Theo tai lieu nghien cUu mau Idi, da granite Cac loai da trung tinh (58 - 64% SiO^) gdm: diorite biotite hai mica chu yeu phan bd pham vi khdi thach anh biotite cd mat gieng khoan BH-19 tai khdi Trung tam, d khdi Bac cd granodiorite biotite sang xam va Ddng Ble adamellite chda nhieu monzonite thach anh, monzodiorite Cac da add yeu (64 - 68% SiO,) tuoi Jura mudn gdm: thach anh va diorite a kiem, d khdi Nam cd granite (BH-8), adamellite, granodiorite, tonalite va monzodiorite thach granodiorite (BH-17) va monzodiorite thach anh (BH-7) Da anh (BH-23 va 817B) phan bo pham vi khdi Ble mdng bi bien ddi thd sinh d cac mdc dp khac Trong sd cac khoing vat thU sinh biln nhat la zeolite va calcite.Theo so lieu phdng xa, tudi tuyet ddi cua da ket tinh dao ddng khoing td 245 ± (Trias mudn) den 89 ± Cac da acid (68 - 74% SiO^) tudi trUdc Creta mudn ehii y l u la granite biotite (BH-40) phat trien d khdi B k Bac diem thach hpc ciia da mdng dUdc nghien cUu (Creta mudn) trieu nam Granitoid d md Bach Hd ed dp ndt ne va hang hde cao, Sd lieu mdi thu dupe xlc nhan so phan bd da mdng trudc, phan ' -^^^ :mki phia Nam eiia khdi phia Tay theo sd lieu nghien cUu mau Idi cua Hinh I • Mdt c3t dia chdt-dia vgtiy theo tuyatt-t' 18 DAUKHI-Sdll/2014 PETROVIETNAM Bing I Phan bo cdc loai dd mong mo Badi Ho (tiieo ket qua nghien ohi mau Idl den i/1/2012cua Vietsovpetro) Khoi Trung tam Adamellite, Tonalite Monzonite thach anh Granodionte Monzodiorite thach anh biotite Monzodiorite thach anh amphibole biotite Diorite thach anh biotite Diorite thach anh amphibole biotite lOiol B i c 1,2,6,402, 404,405,413,415,419,420, 421,423,424,425,426,431,442,448,445, 446,462,901,910,903,1019,1113,11002 404,405,415,425,431,903,910 404,419,431,802,813,1113 23,40,67,145, 503,810,907 Kh6i Khdi Tay Bac D o n g B^c 90,819 1102 Khdi N a m 8,449, 458,16 1201.1202 23,66,91,94,8176 88 66, 73, 804 88,100' 901,905,1113 23,65,145,810 80,88, 100,140 1107 802,813,905,423 65,804,907,1007 100,819 1106,1108 458,17 502,504,1008 431 , „ , , , , ,„ 18,436,1113 441 "~ Too?" 1^ 110,503,711 11 1106 ] Diorite amphibole biotite flguSn: Vmovpeiro bd sung theo ket q u i phan tich mau Idi gdm 10 mau d hai gieng mdi la BH-23 va 817B Cong n g h i khoan tang da mdng nuft n l mo Bach Ho Viec phat hien dau mdng md Bach Hd la sU kien quan trpng edng t i e tim kilm, tham dd va khai thac Bdng So lieu gieng khoan mong cua md Bach Ho So gieng khoan tim k i l m , tham dd mdi can dupe quan tam, 1/2002- Tohn md 1/2002 4/2009 Bach H o 13 18 Khai thac va khai thac s6iT1 154 64 50 268 Tong so 167 67 52 286 Nguon Vietsovpetro Bdng 3, Cdc chi tieu kinh te- ky thudt ciia chodng khoan nhan djnh va danh gia mdi v l t i l m nang dau d them chiln lupc tham dd d I u khf d khu vUc, md mdt hudng 1/1997- 1/1997 Tham dau khf d Viet Nam, d i n h dau mdt budc ngoat viec luc dja phia Nam, thay ddi cleh nhin nhan va xac djnh 1/1984 - sit dung Irong da mong granite nUtne Dtibng Phi/cAig kinh choong phap khoan So met khoan tren Thdi gian VSn tdc cdhoc choong(m) khoan (m/gid) khoan (gid) Ke t d phat hien dau da mdng tai t h I m 8'A" R 93,4 39,90 2,34 luc dja Viet Nam, edng tac khoan tap trung vao ddl tupng 6'/?" R 86,1 41,37 2,08 tang da mdng 816° R 176,0 76,49 2,30 &/2" R 123,8 50,60 2,45 81/2° R 200^7' 65,5 4,35 6V2" R 1603 55,8 440 Viec khoan tang da mdng tai Vietsovpetro bIng chodng khoan vdi dudng kinh nho 6'/i"- 4V2", thdi gian khoan keo dai dac tinh dat da mdng cdng, nut n l , g l y nhieu v l n d l thi cdng khoan nhu toe dp Nguon Viedotpelm Biag4,Cdclogidio6ngldioan\id che dp khoan thudng diing cho dd mong mit ne cd hpc thap, so met khoan/chodng ngan, chodng bj be rang, mdn ring, roi chop Vi vay, can lUa ehpn, cai tien chodng khoan cho phii hpp Vile thi cdng cang khd khan hon khoan vdi chodng dudng kfnh nhd 114,1mm Trong thdi gian dai, chodng khoan mdng 4V2" F47YODPS (phuong phdp khoan rd-lo) fiucmg kinh chodng Ch^ng loai khoan TanISO Tai ay *(3n? *''^"9' ' 8'/2" FGI40YODPD 6'/2" XR40YODPS 12-15 sd loai choong khoan nhU4y2"STX30DX,4V'2"XR45YODPS, 6" XR40YODPS 10-12 4Vi" STR44CGDX Cac loai chodng khoan cd dudng kinh 4V2" F47YODPS 6-7 (Smith) la su lua ehpn nhat Hiln cd them mot 4Vi"cho hieu q u i khoan eao, nhung ciJng cd t h i roi chdp 18-24 phut) - 100 60 - 80 - 70 60 - 65 LUu lUtfng Voi "'"^ phun (lit/giSy) 16-22 Md 10-16 Md 10-15 Md Md 6-8 Nguon Vietsovpeiro bat cd liic nao Chodng khoan 4y2" F47YODPS (Smith) ed Tren thiic te, nhUpc diem Idn nhat ciia choong khoan 13 trudng hpp d bi bj hdng sd 74 hiep tha (chiem cd dudng kinh nho 114,1mm khoan mong la viec 17,5%); chodng khoan 4yi" XR45YODPS cd d i n chodng hdng chdp, dac b i l t xay d cac tdng vdng quay rat khac roi chdp hiep t h i (chiem 50%) sau 22,4 - 43,2 biet Cd chodng khoan d bi hdng d tdng vdng quay 161,8 nghin vdng - tdng so vdng quay qua thap nghin vdng, ed chodng khoan d bi hdng chi d Diunil-sOii/2014 19 THAM DO - KHAI THAC D A U KHI Bang Thdng ke cdc tnldng hap rdi chdp vd ket chdp ciia chodng 4>A' da khoan Chodng khoan I !" ' _ _F47YODPS _ " F47YODPS F47Y0DP'S _f47YODPS_ '_ F47YODPS " ' F47YODPS ^47YODPS Trung binh XR45YODPS XR45YODPS Trung binh N9 4671 141_4 9425 9056 8039 0080 7755 9349 _ 7778 74 59 54 48 47 43 13 48,3 _24 45 34,5 _ J1 _ 14,3^ 17,25^_ 17,5_ "l8,75 17 163 3,25 14,9 5,75 12,7^ 9,25 Tdng so vdng quayKREV Tdc khoan (m/gid) So gid khoan (gid) So met khoan (m) I _Jjl7 i j i I _3^2 ^3,09_ _236 2,61 4,0 3,3 417 ' " 3,58 3,87 _ 49,97 62,1 70,10 72,46 61,2 64,4 11,7 S6,0 22,4 45,9 34,1 sued Roi chdp Ket chdp Ket chdp Ketchdp Ket chdp i , + v.) X„(x^-hv^) khoan den ndc mdng Khi khoan mdng g i l tri n da ^ n r \ ( x , + ( n - l ) v ^ ) X „ ( x „ + ( n - l ) v J tang vpt l§n 80 -100, cho thay cdng nghe khoan khdng b i o Bieu cho phep k i t hpp cac diem khdng gian pha, dUng each X, mdt khoang, khdng vUdt q u i gia tri "r" cho trUde nao dd va tinh gia tri ham lien ket sau: C(r) = N-^^ 0(r-[X -XTfJJ^l dam dp dn djnh ddng hpc cCia qua trinh khoan hay chodng khoan dang lam viec trang t h l i eUdng bdc, h i l u q u i lam vile cua chodng khoan thap va quy dao t h i n gieng thiet ke eung nhu phUdng vi gieng khoan khdng dn djnh Ket luan Trong do: 611 h i m "Hevisaid" Bang viec dng dung ly thuyet Fractal nghien edu va danh g i l trang thai ddng hpc cCia he thdng q u i e(x) = x SO trinh khoan, cho phep khang djnh he thdng ddng hpc qua e(x) = k h i x > trinh khoan khoan da mdng niit n l vdi chodng khoan dudng kinh nhd 114,3 - 165,1mm thudng xuyIn Tiep theo, xly dUng mdi quan h i In C(r) vdi In r vdi cac gia trj khIc cua N, theo xlc djnh thd nguyin cua khdng gian pha n, va dac trUng ciia q u i trinh ddng lUc hpc - roi vao trang t h l i mat dn djnh va m i t tinh b i n ddng hpc Trang thai the hien rd qua k i t q u i khoan II quy dao thuc t l ciia than gieng di sal lech vdi t h i l t k l v l khdng thd nguyen Fractal (D) Cac gia tri thd nguyen Fractal D dupe kiem soat 6\icic, hieu suat lam viec eiia chodng khoan die trung eho trang thai ddng hpc cua he thdng, do: eung bj I n h hudng va kem hieu q u i Cle ch! t i l u kinh t l -I- Neu g i l trj D = - thi he thdng ed trang thai ddng ky thuat ciia chodng khoan thap hpc dn djnh Phan tfch va tfnh toan tfnh dn djnh cO hpc ciia bd c l n + Neu gia trj D £ l va D s thi he thdng ed trang thai khoan qua trinh lam vile cua chodng khoan d d l y ddng hpc vdl mdc dp phUe tap eao, bj rdi vao trang thai gieng, eho phep khIng dinh trang thai cO hpc cOa can mat tfnh dn djnh, tinh b i n ddng hpc eiia he thdng bj triet khoan va can nang ludn lam vile d trang t h l i cudng bdc tieu nhung van cdn cd t h i k i l m solt dUpe va bi bien dang udn sdng hlnh sin va x o l n dc D l y chfnh I I -H Vdi g i l trj D > he thdng bj mat hoan toan trang nguyen nhan khIln \\k dong hpc qua trinh khoan bj mat t h l i dn djnh ddng hpc va rOi vao trang thai hdn loan trang thai on djnh va mat tfnh ben ddng D i l u n l y khSng khdng the kiem soat dupe djnh che dp edng nghe va bp dyng eu khoan vdi dUdng Ddl vdi g i l trj thd nguyen eua khdng gian pha n dupe kfnh nhd chua phu hpp khoan d l mdng p h l n I n h nhU la sd lupng cac yeu td tham gia true t i l p Tren co sd nghien cUu dp cUng ciia td hpp bd c l n vao he thdng va n cd gia trj Idn bat thudng, cd y nghTa khoan, eho phep djnh hudng elc g i l i phap edng ngh^ la trang thai ddng hoc ciia he thong dang cd van 6e Quy vi§c lap rap bd dung cu khoan phii hop n h I m tang trinh cdng ngh^ cua h i thdng ddng hpc khdng edn phii dp cifrig ed hpc ciia he thdng, tang toi da trang thai on hop vdi dieu kien hien tai djnh va ben ddng ciia ciia he ddng hpc khoan khoan D l xac dinh b i n chat va mdc dp phdc tap eiia he ddng hpc khoan da tfnh dUdc gia trj thdnguyen Fractal (D) v l t h d nguyen khdng gian pha (n), thdi gian lam viec vdi chodng khoan cd dudng kinh nhd da mdng cd dp eUng va dp mai mdn cao Tai lieu tham khdo eiia chodng khoan theo cac gieng khoan cac hang khac khoan t r l n md Bach Hd.Trongdd, gia trj thdnguyen pha Fractal D cOa cac gieng dao ddng khoing 1,15 -1,64 Dieu cho thay cd mUcdd phdc tap vdi sU hon loan n h I t djnh, trang t h l i ddng hpc cua qua trinh Vietsovpetro Sado cong nghi khai thdc hiiu chinh mo Bach Ho 201B Vietsovpetro Bdo cdo san xudt hdng ngdy ve cdng tdc khoan.20W-201 A khoan khdng cdn dn djnh va cd su bien doi nhat dinh theo chilu slu g i l n g Nhung v l nguyen ly van n l m kha nang cd the d i l u khien dUpe cac hon loan Khi xem xet gia trj thdnguyen khdng gian phan ciia thdi gian chodng khoan l l m viec lai bien thien rat phii hdp vdi ket q u i nghien cdu theo Lj? thuyet t h I m hpa - Catastrophe [13], cy the I I g i l trj n = - 25 k h i dn dinh khoang Hughes Christensen Company lADC duH grading system for roller bits 1996 PadoHMM npoeKT HameTaTejibHOH N CKBajKMHbi 179 Ha erpoMTenbCTBo 10009 BK-10 Ha MecTopojKfleHMM "Be;ibiH Twrp" Dang Cua, Trln Xuan Dao, S.A Shirin-Zade Cdc DHUKHI-SO 11/2014 21 THAM DO - KHAI THAC D A U KHI 13 V.LArnold Catastrophe theory Springer 1990 qud trinh td to chdc vd hon loan ddng luc hoc khoan 14 Tran cdc gieng khoan xien dinh hddng Tap chf Dau 1997; 2: trang 19-25 Dang Cda, Tran Xuan Dao, I.LBarski, A.M.Gusman Tran Xuan Dao Xdy ddng va dda vao dng dung bg Dao Engineering of optimum oilfield Moscow, Review Oil Industry 3/1999 Cdch tiep can mdideon dinh bo can khoan.Tap chi Dau khL 1998; 4: trang 30-33 Xuan parameters for drilling in basement rocks at White Tiger 15 S.P.Kanisa, S.P.Rurdiumov, G.Malinheskii Synergetic and future forecast Moscow Scientific Publishing House 1997 khoan cu ddy khoan cdc gieng xien dmh hddng 16 A.X.Mwp3aA>KaH3aAe, C.A.UJMpMH3afle noBbiuieHwe vung mo Bach Ho Hdi nghi khoa hpc lan ve khoan va 3