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Iloi nghi Khoa hoc va Cdng nghi Biin lodn qudc Idn thd V KHAI T H A C DAU B A N G G A S L I F T VA C A C GIAI P H A P NANG C A O H IEU QUA L A M V I E C CUA G I E N G G A S L I F T O C A C M O DAU T H u b c XNLD V I E T S O V P E T R O Pham Trung Son, Pham Ba Hicn, Nguyen Quoc Dung Lien Doanh Viet Nga Vietsovpetro.105 - Lc Lpi TP.Vung Tau Email: sonnt.rd@victSOV.com.vn Tom tat: Ke tir phdt trien ky thudl gaslift vdo ndm 1997 XNLD Viet.sovpetro dd cdi thien cung nhu ndng cao san luang khai Ihdc Md Bgch Hd hien dang khai ihdc vdo giai doan sdn luang ddu gidm ddn Hien tgi mgl nira sd luang gieng khai thdc a cdc tdng Miocen, Oligocen vd Mdng cua md Bgch lid dang dp dung khai thdc ddu hdng phuang phdp gasH/l Ky thudl gaslifl (lien tuc chu ky) dang dp dung mgl cdch hieu qud tai cdc mo ciia XNLD Vietsovpetro Do viec phdn lich vd quyet dinh lua chgn gidi phdp cho khai thiic gaslifl cdng nhu dieu chinh liru luang Id rdl quan Bdi viel trinh hiiy nhung nghien ciru vd kel qud irng dung cua cde gidi phdp nhdm ndng cao hieu qua lain vice, cung nhu mgt vdi kien nghi ddi vdi khai thdc ddu bdng phuong phdp gaslifl tai mo Bach Hd EXPLOITING OIL BY GAS LIFT TECHNOLOGY AND SOLUTIONS TO IMPROVE EFFICIENCY FOR THE EXPLOITATION OF OIL FIELD IN J.V VIETSOVPETRO Abstract: Since employing gas lift technology in 1997, J.V Vietsovpetro managed to improve total oil recovery and increase daily production rale in ils operation WhUe Tiger field is producing at the stage that total produced oil decreases yearly Currently a half of producers on Miocene, Oligocene and Basement of White Tiger field are producing by gas lift method Gas lift technology (continuous, intermittent) is applying effect in fields of J V Vietsovpetro Wherefore the analysis and decision for selecting solution for exploration by gas lift, also regulating their production rate are very important action This paper presents the received study and application results of the solutions lo increase an efficiency, also some provide proposals for producing oil by gas lift of well exploited in White Tiger field l.Mfrdau Khai thac d4u bang phuang phap gaslift tai cac mo dku da khSng dinh su lira chpn diing dan phuong phap khai thac co hpc o XNLD vietsovpetro Dau khai thac tCr nhi^u d6i tupng khac nhau, cac thpng so dja chdt ky thuat khac nen viec lua chpn cac phuong phap t6i uu che dp lam viec ciia chung cung khac San lucmg ciia cac giang gaslifl dao dpng khoang rpng, tir 10 tSn/gigng/ngay dem cho toi 600 tin/giang/ngay dem Tieu han Ndng lirgng, Ky thudl cone Irinh Van Idi va Cdng nghe Bien nen viec phan loai giing di dua cac phuong phap tdi uu che dd lam viee cua chiing cung khae Vdi giing cd san lugng ldn hgn 30 tan/ngay dem thi khai thac giing bdng phugng phap gaslift lien tuc cd hieu qua, cdn ddi vdi gieng san lugng thdp hon 30 tdn/ngay dem thi phai chuyin giing sang khai thac gaslift dinh ky Ngoai ra, ddu md Bach Hd va Rdng cd chira ham lugng paraffin cao va nhiet dd ddng dac cag nen eung cdn dua cac giai phap chdng ling dgng parafin, nhira tren edt dng nang san phdm Dudi day la mgt sd giai phap dang dugc ap dung nhdm nang cao hieu qua khai thac giing gaslift Gieng cd siin lu-ong thap Do ap suat via giarri va he sd san pham thdp nen nhieu giing khai Ihac tai md Bach Hd cho san lugng thap Sd gieng cd san lugng nhd hgn 30 tdn/ngay dem chiim tdi 50% quy gieng khai thac gaslift De nang eao hieu qua lam viec cua chiing, ed mdt sd giai phap khac nhu la tdi uu cau true edt dng nang san phdm hay chuyin giing sang khai thac d ehi dinh ky Trong thue te thi viec tinh loan lai cau true edt dng nang san phdm gap khd khan vi ddi hdi phai tien hanh sua gieng de thay bd thiit bi mdi, trang bi lai toan bd thiit bi long giing cho phit hgp vdi cau trite gieng mdi va tat nhien sau moi ldn sira giing, he sd san phdm giam dang ke va lam eho san lugng giam Chinh vi vay, giai phap khdng duge ap dung tai XNLD Vietsgvpetro Chuyen gieng sang khai thac d che dd djnh ky don gian hem, khdng cdn thay bd thiit bi long gieng Cac thdng sd lam viec ciia van chu ky dugc tinh tgan va idp dat vao gieng nhd ky thuat cap tdi Trong nhiing nam gan day, XNLD Vietsovpetro da ap dung cdng nghe gaslift dinh ky va da thu dugc mdt sd ket qua nhat dinh gieng khai thac gaslift djnh ky, chat Idng dugc day len mieng gieng theo chu ky tinh loan Mdi chu ky dugc phan lam giai doan: giai doan tich liiy va giai doan nang day chat Idng O giai doan tich liiy chat Idng, van lam viec ddng, chat Idng tir via chay vao viing can day gieng vit tich luy, dang Ien edt dng nang Ddng thdi vdi qua trinh dd, ap suat nen ngoai can cdng tang Ien, dat den gia tri ap suat md van Van gaslift md, vao edt dng nang va day edt chat Idng tich luy len mieng gieng Ap suat ngoai can bat dau giam van md va giam den mdt gia tri nhat djnh thi van gaslift ddng lai va ket thiie qua trinh nang day cgt chat Idng Xac dinh chi dd khai thac giing hpp Iy, cho khai thac duge lugng dau cao nhdt va kinh ti vi nen Nhirng thdng so chinh anh hucmg den che dd lam viee cua gieng la dg sau dat van lam viec, lugng bom nen va ap suat nap van Da tinh loan anh hudng cua cac tham sd eg ban neu tren Ien san lugng khai thac Dudi day trinh bay chi tiet ket qua nghien eijm gieng 8018 Suphu Ihu^c dp sau dat van lam viec va luu luang khai Ihdc ^Ngoai cac thdng so'cHfnh nhii he so san pham cua gieng anh hudng den dd cao cot chat Idng tich liiy cdn cae yeu td khac nhu thdi gian tich luy, dg sau dat van Neu van dat cang sau thi quang dudng chuyen dpng eua cgt ehdt Idng cang dai va lugng chat Idng hugt cang Icjn Ngugc lai, neu van dat khdng sau thi cgt chdt long tich liiy dugc it, eung anh hudng Hdi nghi Khoa hue vd Cong nghe Biin lodn qudc ldn ihu V_ dan luu lugng chat long thu hoi dugc Theo ket qua tinh loan thi van lam viec dat dp sau 3304m la tdt nhAl Suphu thuoc dp sudt nap van vd luu luong gieng Ap suat nap van quyet dinh den thai gian tich luy chat long va lugng ch5t long tich luy dugc mpt chu ky Ap suat nap van Ion thi lugng chat long tich luy dugc cang nhiau nhimg s6 lugng chu ky mpt dam cang it Ngugc lai, ap suat nap nho thi lugng chat long tich luy dugc it nhung so chu ky tang Moi quan he giira ap suat nap van va Km lugng chat long khai thac dugc cua giang 8018 dugc tha hien Iran Hinh ^ 18,2 '"^'^ 10,4 10,1 J 17,4 'J.S 17,2 5,5 5.2 75 70 «P sual, at 55 50 -^— luu luang khai Ihac - • - Luu luang bam ep Hmh I: Mdi quan he giiia dp sudl nap van vd luu lugng chdt long Theo ket qua tinh toan, che khai thac giing 8018 vdi cac thdng so ky thuat sau: ap sudt nap van 70at, lugng bom 11.300mVngay dem, sau dat van 3304m Vdi cae thdng sd tren gieng khai thac 18 chu ky dem, cho san lugng chat Idng la 18,4m^/ngay dem.Trong mdt chu ky lam viec, ap sudt mieng giing thay doi khgang tir 12 din 14,4at Ap sudt dat gia trj Idn nhdt nut chdt Idng chuyin ddng Ien din mieng giing Ap suat nen ngoai can tang ddn tir 49,lat Ien den gia trj Idn nhdt (khi van gaslift bdt ddu md)Ia61,3at Nham kiem chimg kit qua tinh loan Iy Ihuyit vdi thuc te, da thir nghiem giing 8018 Cac chi sd lam viec thue cua gieng dua tren Hinh Tieu ban Nong lugng Ky thudl cdng Irinh Vdn tdi vd Cdng nghe Bien 8 8 8 Si S S ? S s a Htnh 2: Ddng Ihdi Idm viec ciia giing 8018 So sanh ket qua tinh loan vdi sd lieu thuc te thay rdng cac tinh loan kha phit hgp Cac chi sd khai thac gieng trude va sau chuyen gieng sang gaslift dinh ky dua Bang Bdng I: Cdc Ihong so lam viec cua gieng 8018 Che dq gaslift lien tuc Dp sau dat van, m 3332 Vg, m /ngay dem 13.000 Che gaslift dinh ky Qcl, Tm, m^/ngay 'C dem 11 30 Dp sau dat van, m Ap suat nap van, at Vg, m /ngay dem Qcl, mVngay dem Tm, °C 3332 70 10.000 17 34 Trudc va sau ap dung cdng nghe gaslift dinh ky thay rSng, lugng bom nen giam 2000m'/ngay dem, san lugng chdt Idng tang dmVngay dem, nhiet dp ciia cot chdt Idng tren mieng gieng tang rd ret, tir 30°C din 34°C Cdn nhdn manh rdng, trudc ap dung che dp gaslift dinh ky, cti 10 lai phai dimg giing de rira Idp paraffin langdgng tren cgt dng nSng nhung tir khai thac gieng bdng gaslift djnh ky tdi khdng edn nia paraffin ma cae thdng sd eiia giing hau nhu khdng thay ddi Dieu ehimg td rdng gaslift djnh ky ban chi dugc su idng dpng paraffin tren dng khai thac Tir kit qua thu dugc neu tren cd thi tinh tgan va dua vao khai thac gaslift djnh ky cho cdc giing cd lira Ivrpmg betai md Bach Hd Gieng khai thac gaslift lien tuc Cdng viec thudng xuyen phai thuc hien ddi vdi gieng khai thae gaslift la kiem tra chi dp cdng nghe gieng cho gieng lam viec d ehi tot nhat De thuc hien dugc dieu do, Hdi nghi Khoa hoc va Cong nghe Biin loan qudc Idnjln'r f c5n thuang xuyan tian hanh nhiing cong vice chinh sau day- xac dinh dp sau ddn neu thay van gaslift hong va li'nh loan luu lirgng nen can thidt Duoi day trinh bay mot so kat qua tinh toan va ap dung tai mo / Tdng sdu ddn nen Hang quy XNLD Vietsovpetro da tian hanh muc chat long ngoai cdn ciia gieng khai thac gaslift da xac djnh dp sau bom nen ciia tirng giang cu the lir kcl qua da phan tich, danh gia va da cac giai phap cho cac giang Trong truang hgp lugng bam khong du cung lam cho nen khong qua van lam \iC'c Vi du gicng 45 1, bang ihiet bj muc ch5t long ngoai can da xac dinh dugc muc chat long sau 2655m Khi nen qua van khai dpng dal a dp sau 2602m O che dp nay, gieng cho san lugng chat long 62,5m"*/ngay dam bom 6000m"* Sau linh loan, phtin tich, da da xuat can lien hanh khoi dpng lai giang bang each bom vai lirgng Ion hon dc dugc day xuong vi tri van lam viec dat a dp sau 2908m Sau giam dan krgng nen va bom voi krgng on djnh la 8000m /ngay dam O che dp dc xuat, gicng co the cho san lugng chat long 72m^/ngay dem Ket qua tinh toan dua tran linh So sanh kat qua linh toan vai so lieu dac thuc te ciia gieng thay rang ket qua tinh toan kha phii hgp Hien giang khai thac a che bam cp 10.000m va cho san krgng chat long 80m7ngay dem 74 Che kbii'i [liac di \ual i 72 CO I 68 Ciic dp khdi ihiic hii-n tai 10 11 12 13 Luu lugng nen, nghin m^/ngdem Hmh 3: Cdc che khai Ihdc giing 451 Thay van gaslift Cd nhieu nguyen nhan khae nhung xae sudt lam van gaslift bj hdng nhiiu nhdt la gieng lam viee khdng dn djnh Nhdm xae djnh chinh xac vj tri van bj hu da sit dung thiit bj gieng sau de xae djnh ap sudt va nhiel dd dgc than giing Thiit bj dugc dat tai cac vj Tiiu han Ncinv linmg Kv tliiidl cciiig irinli Van tin vd Cling nghc; Bien tri Ircn ya dudi dp sau dal van khoang 10m Ket qua nhiet dd vii ap sudl cita giing 643 dugc Ihi hicn iren Hinh Ap iLtiil J „ „ T" ) —• mi lOO (1 20 J) fiO 80 Nhicl tlo oC KIO 120 1-10 — soil ! „„„ 1000 E E •5 iJlHI llJOO • | 200(1 - s 2ion i 2500 3000 3.00 isnn Hinh 4: Ket qud dp sudl vd nhiet dgc thdn gieng 6-13 Ket qua cho thay, van so (dat a dp sau tuyet doi 1445m) bi hong vi ap suat a vi tri duoi van cao hon ap suat o vi tri tren van la 4,8at Neu van khong bi ho thi su chenh lech khong lan hon 0,3al Tuong tu, nhiet dp a vi tri duoi van cao han nhiet dp a vi tri Iran van la 5,2 C Neu van khong bi ho thi sir chenh lech khong Ion hon 0,5''c Da tinh toan de xuat thay van gaslift bi hong Sau khac phuc dugc hien tugng Iran thi nen qua van lam viec (6 dp sau tuyet doi 3028m), san lugng gieng tang Ien khoang lOmVngay dem Bffm hda phdm vdo dong nen Ban ch4t ciia giai phap cong nghe la lam thay doi cau true dong chay ctia hon hgp san phSm nham giam sir trugt ciia khi, tang hieu qua nang day ciia nen Mat khac, hon hgp hoa phdm c6 kha nang uc ch^ sir lang dpng paraffin va muoi tren ong nang XNLD Vietsovpetro da nghien ciru va lira chpn dugc hon hgp hoa pham bom ciing voi dong nen gaslift Hien nay, dang chuan bi nhimg khau cuoi ciing da thir nghiem cong nghiep_ngoai-m6^ SauJthi ihiJuighiera cong nghiep se de xuat ap dung cho nhieu gieng tai mo Bach H6 San iugng ddu gia tang uoc tinh dat khpang 100m /ngay dem Hal light Khoa Imc vu Long nghe Bten Ulan cliioc tau Khai thdc ddng thai nhiiu tdng san pham Muc dich cita phugng phap la khai Ihac ddng thdi hai hoac nhiiu via san phiim riling biel cita giing khai thac, theo dimg chi cdng nghc danh rieng cho moi via mil khdng phu thugc hay anh hudng ldn San phdm khai thac tir cac via dugc chuyen len mieng giing theo mdt dng khai thac (OKT) Thiit bj bi mat va long giing luong img \di cac thiit bj danh cho khai thac mdt ddi lugng Diim khac la sir dung cac pakcr ngan cac via san phdm vii thiit bi diiu khien luu lugng tir via : : : — > -^ :; \ —• y — ; 1-Paker; 2-Tui Mandrel; 3- Van gaslift; - Thiet bi dieu chinh luu lugng; 5-6ng khai thac ^ Ifinh 5: Phuang phdp khai thdc gaslift dong thai hai via iTu diem cua phuong phap: - Nang cao san lugng khai thac, he so sir dung ciia thiet bi; - Han che qua trinh hinh hydrat, atphan, nhira va paraphin tang luu lugng giang; - Giam chi phi dau tu ban dau, khoan, he thong, thiet bi, chi phi danh cho sira gieng van hanh; - Tang he so thu hoi dau, cho phep khao sat va kiem soat viec khai thac tirng via rieng biet hoac khai thac dong thoi mpt each toi uu Ket luan Viec ap dung nhilu giai phap cong nghe - ky thuat nh^m nang cao hieu qua khai thac cac gieng gaslift tai XNLD Vietsovpetro da mang lai nhihig kit qua co y nghia thiit thuc ve mat cong nghe va kinh te Tren ca so cac ket qua dat dugc co thi trien khai ap dung cho toan mo Tiiu ban Ndn^ lucmg Ky ihudt cons trinh Van tdi vd Cdng nghi Bien Lo'i cam cm Tac gia va d6ng tac gia xin chan cam on cam an Ban to chuc hpi nghi Khoa hpc va Cong nghe Biin toan qu6c lan thii V, Vien Khoa hpc va Cong nghe Viet Nam, Ban To chuc tieu ban Nang lugng, KT thuat cong trinh Van tai va Cong nghe Biin va cac don vi lien quan da tao co hgi cho chiing toi dugc tham gia vao dien dan nay, voi muc dich trao doi va hoc hoi nhiing cong nghe va ky thuat mai ITnh vuc d^u noi rieng va cong nghe bien noi chung nham gop phan sire luc cong viec xay dung dkx nuoc Mpt l4n n&a chiing toi xin chan cam on va chiic cac quy vi nhilu sue khoe, chiic hpi nghi tl chiic cong va cong han n&a TAI LIEU THAM KHAO 1.Advanced production optimisation Edinburgh, 2004 2.Phiing Dinh Thuc, Duong Danh Lam, Le Ba Tudn, Nguyin Van Canh, 1999 Cong nghe va ky thuat khai thac dau NXB Giao due 3.Bao cao dl tai nghien cim khoa hpc NIR III.5, III.6, Vien NCKH&TK D4U biin, XNLD Vietsovpetro nam 2003, 2004,2005,2006,2007,2008,2009,2010 ... Mandrel; 3- Van gaslift; - Thiet bi dieu chinh luu lugng; 5-6ng khai thac ^ Ifinh 5: Phuang phdp khai thdc gaslift dong thai hai via iTu diem cua phuong phap: - Nang cao san lugng khai thac, he... viec khai thac tirng via rieng biet hoac khai thac dong thoi mpt each toi uu Ket luan Viec ap dung nhilu giai phap cong nghe - ky thuat nh^m nang cao hieu qua khai thac cac gieng gaslift tai XNLD. .. thuat cap tdi Trong nhiing nam gan day, XNLD Vietsovpetro da ap dung cdng nghe gaslift dinh ky va da thu dugc mdt sd ket qua nhat dinh gieng khai thac gaslift djnh ky, chat Idng dugc day len
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