Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho" CTNG DUNG PHl/ONG PHAP CAN BANG VAT CHAT D I O A N H GIA KHA N A N G KHAI THAC Md VA LLTA CHON CH^ DO KHAI THAC HOP L? NHAM GIA T A N G H E S[.]
Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho" CTNG DUNG PHl/ONG PHAP CAN B A N G VAT C H A T D I O A N H GIA K H A N A N G KHAI T H A C Md VA LLTA CHON CH^ DO KHAI T H A C HOP L? N H A M GIA T A N G H E S THU H | DAU Phan Trgng Toan, Phung Dinh Thuc Cong ty Tham va Khai thac Dau ABSTRACT Capacity in force of oil in resen/oir maximum production flow-rate of field at any production time while the field is developing, flowing wellhead pressure, flowing bottom-hole pressure, skin effect, permeability are field parameters that you can estimate oil recovery ratio We make software with true data that can calculate field parameters above Calculate result be processe for any time that field is developing to select maximum oil recovery Based on true data & calculate results, we propose some good industry solution to raise the oil recovery MdoAu Hpi thao khoa hpc "Nang cao he sd thu hdi dau md Bach Hd" la de tai hay va thyc tien dang dugc phat trien tai Xi nghiep lien doanh Vietsovpetro, da thu hut nhieu chuyen gia, nha khoa hpc va can bd chuyen nganh tham gia Chung tdi viet mdt bao cao gdp phan nhd vao sy cdng eua hdi nghi, dd la "l^ng dung phuang phap can bang vat chit de danh gia kha nang khai thac md va lya chpn che dp khai thac hgp ly nhim gia tang he sd thu hdi diu" Tham gia hdi thao lan cung la mdt dip rit tdt dugc gap gd cac can bd tam huyet vdi nganh, trao ddi hpc hdi kinh nghiem nham giai quyet tdt nhiem vu ehinh tri thupe dan vi minh Hoan ban bao cao nay, chung tdi bay td Idng biet an sau sac tdi dng Phung Dinh Thyc, Tdng giam ddc cdng ty PVEP va ddng nghiep da tao dieu kien, giup dd, nhan xet, gdp y cho chung tdi nhumg y kien quy bau I BAI TOAN THI/C T^ Mdt hdn hgp Hydroeaebon cd the md ta bang mdt bieu dd pha (Hinh 1) Trong bleu dd pha ed mdt diem tdi han CP (Critical point), tai day ed sy chuyen pha cua hdn hgp Hydrocarbon Diem CP cd ap s u i i Pb va nhiet dp T, Vung ap suit Idn han P^, nhiet dp nhd han T, tdn tai chu yeu pha dau, day thudc ting chUa chua bao hda (Undersaturated) Gie'ng khai thac tU ting ehUa gpi la gie'ng dan pha, thu dugc chu yeu la d i u Xet den mpt gieng khoan khai thac tU tang ehUa chua bao hda, ed ba vung ed the dugc phan chia de khao sat chuyen dpng eua Hydrocarbon gie'ng hoat ddng, Hinh 2: Bien dn dinh Tam gie'ng Bien dn dinh gia Vung chay Hinhl 118 Hinh Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bach Hd " - Vung dn dinh: Tren bien eua vung sudt thdi gian hoat ddng eua gie'ng, ap suit khdng thay ddi - Vung chuyen tiep Transient: Profile ap suit vung ed dd ddc Idn - Vung dn dinh gia: Tren bien eua vung ap suit giam cham, nhien van tdc thay ddi ap suit la hang sd Kha nang nao de khai thac tdi uu va gia tang thu hdi dau tU tru lugng dau cd tang chUa chua bao hoa, bien dn dinh gia ? II PHLTONG TRlNH KHU^CH TAN BAN KINH; LOI GIAI CHO V U N G CHLTA BAO HOA, PHA DAU; CAC T H O N G S6KYTHUATTANGCHC;A Phuang trinh khuyech tan ban kinh vung can gie'ng, ap dung cho chit Idng ed he sd nen nhd, dp nhdt hang sd: k^c, dp dr \ Cdthe viet lai nhu sau: drj k dt \ dp \ d~ p _ /.I(IK\ dp r dr r dr' k (1) (2) dt Ldi giai tdng quat eua phuang trinh nay: P,., - P, Qfi E,{x) (2') ES-x)^-\^~di •' u Trong dd: La ham tich phan luy thua va Akt Trong vung dn dinh gia, tang ehUa chua bao hda pha diu, cd Idi giai sau: P=/^,+iii^[i„(^)-(f,)] kh r (3) Ir,' SCr dung ban kinh vung dn dinh gia r^,, hoat dpng thCr gie'ng xac dinh ap suit trung binh, phuang trinh (3) trd thanh: //) ' (/ kh r (4) ,1,' Chuyen gia tri sd thUa sd eudi cung vao ham Idga va de y den hieu Ung skin s, phuang trinh (4) trd thanh: kh r (5) Phuang trinh (5) da xCr dung eae thdng sd gie'ng cho phep xac dinh ap suit day gie'ng P^ theo luu lugng khai thac q Day la mdt quan he dudng thing vdi he sd gdc (-Const): Const = Pd = Pth - Const * q (5) 141.25z/ , 0.472r '—{Ln ^-l- s) kh r (7) 119 Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho" III XAC DINH C H £ O O KHAI T H A C CHO GI^NG Vdi mdi gia tri thyc nghiem P,b, tCr phuang trinh (5), cd the xay dyng dugc mdt dudng thang nhu Hinh Dudng thang thudng gpi la dudng IPR (lnflov\/ Performance Relationship) Trong qua trinh khai thac, ap suit diu gieng thay ddi theo luu lugng khai thac, quan he cung la mpt dudng thang nghieng it, thudng gpi la VLP (Vertical Lift Performance) Xem Hinh Hinh Diem I giao cua hai dudng IPR va VLP la diem khai thac gie'ng dau Tai diem cho phep md gieng khai thac vdi luu lugng q^, ap suit day gie'ng P^ Neu bd qua mit mat ma sat, ap suit P^ bang vdi ap suit diu gieng P,b thay ddi cham theo thdi gian nen diem I dn dinh gia va cung thay ddi cham theo thdi gian Sau thdi gian dt diem I chuyen diem I' va che dp khai thac eua gie'ng phai thay ddi theo Chung ta phai ludn ludn xac dinh dupe diem I' de dinh hudng cho che dp khai thac tdi uu gieng diu IV PHUONG PHAP CAN BANG VAT CHAT; H $ S THU H6|; KHAI THAC TICH LOY Phuang phap can bang vat chat dya tren dinh luat bao toan khdi lugng: "Khdi lugng hydrocarbon ting chCra ban diu" - "Khdi lugng hydrocarbon khai thac dugc" = "Khdi lugng hydrocarbon cdn lai tang chUa" Phuang phap can bing vat chit, ddi edn gpi la "Phuang phap khai thac", chung dugc phat trien theo hai dai lugng: Luu luang khai thac tich luy va sy thay ddi ap suit ting chCra Ting ehUa dau chua bao hda: ^ = exp(c(/^.-/^J) He sdthu hdi dau: V (8) Co^o+c.A,+c^ (9) exp(c,(P.-/^J)-l (10) He sd thu hdi diu phu thudc vao dp giam ap dp: dp = P^ - P^^^ (11) He sd thu hdi diu cho phep tinh luu lugng khai thac tich luy: Q^ = Qr (12) Can bing vat chit the hien edng thuc (12): Luu lugng khai thac tich luy la mdt ham eua dp giam ap suit dp 120 Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bqch Hd" V LAP TRlNH T[NH TOAN CAC T H O N G S GI^NG Duflieu vao chi/cfng trinh Du lieu vao thyc te cho ehuang trinh tinh nhu sau (do cdng ty Schlumberger phat hanh): • - Ap suit ban dau tang ehCra 5651 psi - Ban kinh tang chua 745 ft - Chieu cao tang chUa 53 ft - He sd the tich tao 1.1 res bbl/STB - Dp IP rdng 0.19 KhdngthUnguyen - Dp nhdt chit Idng 1.7 cp - Dp thim 8.2 mD - Bao hda nude 0.34 KhdngthUnguyen - Ap suit dau gie'ng 3000 psi - Ban kinh gieng khai thac 0.328 ft -Skin Khdng thU nguyen DO lieu nhap vao chifdng trinh nhWsau: - Nhap tryc tiep qua man hinh tung TextBox, hoae - Nhap tryc tiep qua man hinh Click phim "Calculate", hoae - Nhap trudc qua mdt file ehuang trinh Microsoft Access: + Dudng d i n tdi bang du lieu: C:\Program Files\OilRecoveryData\T1 DataFile\T1 OilData + Khi can chpn gia tri tUng thong sd vao cho ket qua phu hgp thyc te, du lieu chpn Ipe gia dinh dat bang FieldVars cd dudng dan sau: C:\Program Files\OilReeoveryData\T1DataFile\ FieldVars Chuang trinh se ty ddng ket ndi vdi du lieu tai thdi diem chay Miu thie't ke bang du lieu: + Ddi vdi bang TI OilData: C ••b h O 0.129E-5 745 j 53 0.19 i B Pi s h K 0.34 : 1.1 5651 0.328 8.2 Sw i : i 1^ 1.7 Pdg 3000 Mdi ddng eua bang la sd lieu tinh cho mdt gieng, cd the tinh cho nhieu gieng theo thCr ty ngudi dung + Ddi vdi bang FieldVars: s Tb rg i B i ^ k h Sd hang eua bang la y Trong mdi opt la sd lieu thay ddi cua bien tuang Ung, ehuang trinh ty ddng phan biet dung tUng sd lieu cua bien Bao cao dua vi du vdi chin ddng cua bang 121 Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho' DOflieu chUdng trinh - Luu lugng khai thac tich luy Tru lugng dau ban diu tang chua - Luu lugng khai thac d ap suit trung binh bat ky Thdi gian khai thac tich luy - Thdi gian sdng cua md (tinh den luu lugng du nhd cho muc dich thuang mai) - Cho phep lya chpn tdi uu che dp khai thac, hudng dan md gieng d luu lugng nao la tdt nhit, cho biet thdi gian khai thac d mdt luu lugng ed dinh la bao lau - Trong hoat ddng thCr gieng xac dinh dugc P,b, ehuang trinh cho phep ty ddng dieu chinh ket qua tinh sai lech it so vdi thyc te - Chuang trinh cho phep chpn Ipe tUng gia tri thdng sd vao cho ket qua phu hgp thyc te nhit - Chudng trinh ty ddng in ket qua tinh va dd thi md phdng hoat ddng khai thac cho ca tudi ddi mo - Chuang trinh ap dung tinh cho cac gieng thupe tang chCra chua bao hda, khai thac dau la chu yeu - Chuang trinh ed the tinh mdt lin cho nhieu gieng khai thac khae VI l/NG DUNG CHLTONG TRJNH T[NH Danh gia kha nang khai thac mo Ket qua tinh toan cho mdt ddi md vdi sd lieu md d muc (V) la nhu sau: - Tru lugng cua tang ehCra la 1881968.038 STB - Luu lugng khai thac ban dau cua gie'ng la 625.36 STB/d - Luu lugng khai thac d eudi ddi md la 11.08 STB/d - Lugng diu khai thac tich luy dugc la 64292.11 STB - Thdi gian khai thac tdi eudi ddi md la 165.229 - Luu lugng khai thac trung binh mdi eua md la 389.11 STB - He sd thu hdi dau la 0.0034 Hieu suit cua gie'ng khai thac: 3.544% Dd la sd phan tram cua diu khai thac tich luy (tinh den eudi ddi md) so vdi tdng tru lugng md Md khai thac khdng hieu qua Giai phap cong nghe cho lUa chon che dp khai thac hdp ly, nang cao he so thu hoi dau Ket qua tinh va dd thi md phdng cho dp giam ap tUng lOOpsi va diem lam viec cua gie'ng dtUng thai diem khai thac, xem hai trang ke tiep: 122 - Dd thi dinh hudng cho md gieng khai thac tdt nhit d tung thdi diem - Neu giu ap suit dau gieng khdng ddi, luu lugng khai thac tang len dugng IPR eat true hoanh xa gdc tga dp Khao sat anh hudng eua mdi thdng sd gie'ng tdi diem lam viec se cho ta giai phuang phap tang luu lugng khai thac hoae tang kha nang thu hdi dau - vgi mdi dudng IPR, neu ap suit dau gie'ng cang thip thi diem lam viec cua gieng se lui ve phia gin true hoanh han, tuc la cho luu lugng khai thac ign han Dieu lien quan tdi ma sat dng khai thac (Tubing), nang luang the & nang lugng tinh gie'ng Giai phap lam giam ma sat Tubing thugng dugc ap dung hoan thien gie'ng, dieu dd se giam mit mat ap suit tgi dau gie'ng, nhu the ap suit Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bach Hd " dau gieng giam di Nang lugng the lien quan tdi dp sau cua gieng la khd thyc hien, cdn nang lugng tinh lien quan tgi sy thay ddi van tdc chuyen ddng cua chat Idng Tubing: Nen dung Tubing cd cung mdt dudng kinh trong, ludn chdng sy lang can diu Tubing lam thay ddi dudng kinh Tubing Ket qua tinh tU chUdng trinh thyc hien giai doan khai thac ty nhien cua gie'ng khai thac dau Chuang trinh cung cho kha nang tinh luu lugng bam ep via */ Ket qua mo phong khai thac gieng dau Calculate Resull hor One yon ^7n ts,\ *.-t> MIA iôa ãôô> i-^ MM «» *«) t » M« *iW 4aR 3S^ 3»0i 8.ri IGS :is» * J X3E»>?S»(6 »Ti rfadViTr.'s ^ V IW^'ffl'HA* ãWS&ô6?CTTKS ããr st-r^xsTs: rw ằ i ' t t * v n » ^ £u;£«tr-*t »**»» yfcieMijMUvi 'J3L»i3XSSUrs, XJtt95n*.'Wl r.tf wsistiw 3L' K ' J W i a L I :?i5>r7»!«'(« ;«?aswK*c33i -MswitiM'*; ;'»!«s»M;-fl V-.'»W9Htii\*( 15C8CTa^1C?Sl ijsrwisaBiw- */ Do thj mo phong khai thac gieng dau Ptioae Orl Productron JfTGCKOrrKI '•ri v-irMfir-i? *W ;ôfftTiằi :w:.x??MSx? 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