Tính toán thuỷ lực hệ thống bơm áp suất thấp thuộc hệ thống bơm sục bùn trên giàn khoan tự nâng 90m nước tam đảo 03

NGHIEN CUfU - TRAO 0(!)l TINH TOAN T H O Y LIJC HE T H N G B Q M AP SUAl THAP THUOC HE TH6NG BQM SUC BUN TREN GIAN KHOAN T y NANG 90M NU'aC TAM D A O 03 Vii Van Khoa, Dinh Vilt Hai, Do Diic Tho Trung tdm Mdy Ddng ldc, Vien Nghien cdu Co (NARIME) TOM TAT Tren gidn khoan tU ndng dl khoan tham dd vd khai thdc ddu khi, he thdng bdm sue biin cd vai trd rdt quan Nd gdm cdc bdm dp sudt cao, bdm dp sudt thap kit hdp vdi cdc thilt biphu trd khde, thdng thudng he thdng dUdc nhap khdu ddng bd tU nUdc ngodi TU nam 2008 dUdc sU hd trd cua Bd Khoa hoc Cdng nghe, Vien Nghien cdu Cd dd phoi hdp vdi Cdng ty Co phdn Chi tao Gidn khoan Ddu de thuc hien viec nghien cdu thilt kl, chi tao vd lap ddt gidn khoan tU ndng 90m nUdc, cd he thdng bdm sue biin Phdn tinh todn cd sd he thong bdm sue bun cdc thilt klcua nUdc ngodi ludn Id mdt bi mat, khdng dUdc chuyen giao, dieu ndy gdy khd khdn cho viec nhdn rdng kit qud ve sau De tiing budc Idm chu tinh todn, thilt kl cd sd cua nUdc ngodi, nhdm de tdi dd thu thap, nghien cdu, cap nhdt nhieu ngudn tdi lieu vd ngodi nUdc, sau do, tiln hdnh tinh todn kilm nghiem tUng phdn thilt kl cd sd cua nUdc ngodi Trong pham vi bdi bdo ndy, chung tdi trinh bdy vdn tdt kit qud tinh todn thuy lUc he thong bdm dp sudt thap »ABSTRACT On mobile offshore self-elevating drilling rig for surveying and exploiting petroleum, leg jetting system (including high pressure pumps, low pressure pumps in sync other support equipments) has an important role Commonly, system is imported from abroad In 2008, with the support of the Ministry i of Science and Technology, National Research Institute of Mechanical Engineering (NARIME) in colI laboration with Petro Vietnam Marine Shipyard (PVMS) to perform the study, design, manufacture and '.installation ofjackups 90m of water, including leg jetting system Basic calculation of leg jetting system in foreign design is always secret, not be transfered, this matter makes difficulties for developing result later For step by step to master foreign calculations and basic designs, authors collected, studied and updated domestic and overseas documents, then perform test calculations some parts of foreign basic design In 'this article, we present compactly hydraulic calculation for low pressure pump system ^^ TAP CHf CO KHf VIET NAM • Sd 1+2 (Thdng 1+2 nam 2012) NGHIEN ClJfU - TRAO D(!)l KHAI QUAT VE H$ THONG BOM syc BUN TREN G I A N KHOAN TV" N A N G 1.1 Gidn khoan td ndng Gidn khoan tii ndng Id gidn cd than gidn du ldc ndi dl nd cd thi ddpc lai dat bdi tdu tdi vj tri da dinh, sau dd, gidn ddpc nang lln tren mat nddc biln nhd cac chan chdng xudng day biln Gidn khoan td nang ddpc thilt ke de hoat dpng tai nhdng vung biln cd dp sau tdi 150m, chiu ddpc sdc gid d tdc dp tdi da 180km/h, tdc dp ddng chdy 2m/s, khoan dat dp sau 8000 10000m 1.2 He thong bom sue bun tren gidn khoan td nang Cdc chdn gidn khoan vd dl (legs and footings) ddpc gan chat vdo them luc dia giup cho gian khoan td ndng dn dinh tai vi tri 1dm viec (Hinh la va lb) Tren hinh la thi hien qud trinh di chuyin vd dinh vi gidn khoan td ndng d dai ddPng Gidn khoan sau chi tao vd thuy, ddpc tau keo lai dat den vi tri khoan Tai dd, cdc chdn gidn khoan ddpc cho tdi thim luc dia, chan dl gian khoan gan tilp xuc vdi thIm luc dia, dddi ddy cua chdn de ludn ludn tdn tai ldp "bun nhdo", vi vay, chdn dl de hi tnipt khdi vi tri ban dau (hinh 2b), dilu ndy 1dm cho todn bd gidn khoan mat dn dinh He thdng bom sue bun dung dl day "bun nhdo" khdi vi tri dddi chdn dl, giup chdn dl tilp xuc vdi ldp dat gdc Sau day hit bun dddi chdn dl, tien hdnh chdn de xudng ldp dat gdc vd ndng thdn gidn khoan len (chat tdi so bd), tilp tuc bom nddc vdo thdn (gia tai) de dam bdo khd hit Idn cua cdc chdn Luc ndy, gidn khoan ddpc neo chat bang he thdng neo vd cd thi chiu ddpc tai trpng mdi trddng cung nhd tdi trpng phdt sinh qua trinh lam viec cua gidn Dl di chuyin gidn din vi tri khoan khac, chung ta tiln hdnh theo trinh td ngdpc lai cdng tdc ndy lai phdi tiln hdnh d noi nddc sau (tdi 150m) Dl gidi quylt cdng tdc nay, cdc cong ty thilt kl, chi tao gidn khoan tren thi gidi deu ap dung h | thdng bom sue bun (leg jetting system) Vi h^ thdng bpm sue bun c6 thdi gian lam vi^c ngdn, khdng gian ldp ddt tren gidn khoan biln rat han chi, nen cd m^t sd b0 phdn ciia he th6ng ddpc tich hpp cung vdi cdc h | thdng khac (he thdng bom bun, cung cap khi, bom nddc dan, ), thude nhu cdu sii dung d mdi thdi dilm ma ap dung quy trinh van hdnh cho phu hpp a a I * 'E '.i:.;lcira>P«d toj ratvMiiciils na»i •MtoMprmk Hinh lb: Sd trdpt cua chan dl gian khoan Trong trddng hpp tdng quat, he thong bcm sue bun tich hpp td he thong cO ban sau: Do dien tich chdn dl rat Idn (140-180m2/ He thong bom dp suat cao: He thong bdm^ cnan de) nen viec dpn sach bun d dddi chdn d l suat cao ddpc noi vdi he thong bom bun Ap suat ciia qud trinh dinh vi, di chuyin gidn khoan he thdng bom ap suat cao (khi sue bun) can dat «200f) Id cdng viec rat khd khdn, phiic tap; ddc biet Id PSI(140kG/cm2) ll TAP CHf CO KHf VIET NAM • Sd 1+2 (Thang 1+2 nam 2012) NGHIEN CUfU - TRAO D | Cdng suat dan ddng cua mdi bom bun cd thi len tdi 2000 HP, mdi gidn khoan thdng thddng ddpc lap ddt 2-3 bpm bun Cdc bPm bun thddng dung loai piston 2-3 xi lanh, sii dung d chi dp bom bun, dp suat cd thi dat din 5000 PSI (350 kG/cm2) D l nap lieu cho bOm bun vd lam tdng hieu qud cua nd, tren gian khoan td ndng 90m nddc cd bd tri bom nap bun (charging pump) Ngodi d l chuan bi bun cd hang loat bom phu trp khde nhd: bPm trpn bun (mixing pump), bPm mdy khii (degasser pump), bPm mdy khd set (desilter pump), Td dng gdp cua he thdng bom nddc thd, cdc dng thep dp suat thap loai 12" se dan nddc tdi cdc b l chda vd cdc he thdng phuc vu tren gian khoan n g thep dp suat thap loai 6" se ddpc ndi vdi dng mem dp suat thap dan tdi dau chd cua dau phun (eductor) bd tri khoang cua de chdng Idn Hinh la so sd dung nddc dp suat thap de trp giup nang, chdn de Khi chdn de, cdng nhdn van hdnh se md van nap nddc Nddc biln thdng qua tam Ipc, di qua dddng dng va van d l nap day nddc vdo khdng gian He thdng bom nddc dp sudt thap =125 d l chdng lun Nhd vay, loai bd ddpc ldc day dc PSI (9,85 kG/em2) He thdng ndy ddpc ndi vdi - si met chdn Khi nang chdn dl, van he thdng bPm nddc dan (sd dung thuy, nap nddc ddpc khda lai Nddc td bom dp suat chat tdi dinh vi gidn khoan), bom nddc thd, thap thdng qua dddng dng vd van rdi di qua dau bpm cdu hda, Phan trung tdm cua bPm nddc phun (eductor) d l di vdo nddc biln Dau phun dp suat thap Id bPm chim (submersible pump) ddng vai trd "mdy bom" d l hut nddc Idng bd tri dpc theo chdn gidn dung d l hut nddc biln chdn d l vd xd bien Vdi the tich mdi de chdng (vi vay cdn gpi Id bOm nddc thd - raw water lun td 2000-2500m3, bang viec hut xap xi 75% pump) Hinh la so khdi he thdng bom dp thi tich nddc, cung se tao ldc ndng 1500suat thap tren gidn khoan td ndng 90m nddc 1900 tan cho mdi chdn Ddy Id mdt ldc ndng rat Tam Ddo 03, Viet Nam thilt kl, chi tao ddng kl cho qua trinh ndng chdn gian khoan ii-ia^ws«fli>ici GKACi-tO-W3-0aMCi MHi.tffWS-onbicv a--4%Afra7E>IC1 9au phim (chin pti^l) | Hinh 2: He thdng bom ap suat thap TAP CHf CO KHf VIET NAM • Sd 1+2 (Thdng 1+2 nam 2012) NGHIEN Cdu - TRAO 001 thermal sizing, latest edition; ASME section VIII, div 1, latest edition DUdng dng: 4", 6", 10" m till 'KM CôJ?ằM ã(>ãM Ddc dilm cdu tao cua dUdng dng dp suat thdp, diiu kiin Idm viic , < D) KM JiT IWI I R M ' i i snona: \ I Todn bO hi thdng bOm nddc thd bat 6k td mdy bcfm chim Mdy bom chim cung vdi diidng { OAi 'Hit* dng thep 10" ddpc lap dpc theo chdn gidn khoan Cfv-O vd cd thi trdpt len xudng trIn chdn gidn khoan Tren dng cd cdc ddu chd dl ndi vdi dng gop Tai dng gdp, he thdng bPm nddc thd ddpc chia cho nhdng chiic ndng khde Dddng dng 6", sau Hinh 3: Sd dung nddc ap suat thap dl trp giiip ndng, dd dxic^c thu nhd thdnh 4" vd ndi vdi dng m^m, thdc hiln chdc ndng cua he thdng bom sue bim chan de He thdng dddng dng bom sue bun dp suat thap TfNH T O A N T H U Y L U C H £ T H N G B O M d chdn gidn khoan cd cau tao tdPng td Tren mdi chdn cua gidn khoan, he thdng dddng A P SUAT THAP dng dp suat thap bao gdm: 6ng mIm dp suat thap 2.1 Dac tinh ky thuat he thong bOm dp suat thap dddng kinh 6" ndi td dng gdp tdi bich chd cua ong tren gian khoan td nang 90m nddc Tam Dao 03 4" tren de chong lun Hai dau dng mem co md 4"-6" vd cdn thu 6"x4" Tren de chdng lun co dng thep 4" vd dau phun (eductor) Nddc Bdm nUdc thd (Raw water pump): khoang dl chdng lun se ddpc xd ngodi qua ong 4" sau dau phun Bpm: SU 16-500; Ddng cP: SM 12FT-127-4S Sd ldpng: 03 bd Nha cung cap: RITZ PUMPS PTE LTD 2.2 Tinh toan kiem nghiem he thong bdm ap Ddc tinh ky thudt: Ldu ldpng 2200GPM tai 220 ft suat thap (500 m3/gid tai 67m) vd 2597 GPM tai 67ft (590 m3/gid tai 20.5m); Tdc dp 1750 V/ph; Cdng suat 2.2.1 LUa chon phUdng phdp tinh todn 135KW De tinh todn thuy ldc dddng dng cd nhi^u Ddu phun (eductor): phdPng phdp khde nhau: ; I ; Sd ldpng: 03 cdi Nhd cung cap: OAKWELL ENGINEERING LIMITED Tinh theo cdc cdng thdc ly thuylt / thiic nghiem: tren cP sd ddc dilm cau tao he thong dddng dng, tinh chat dung dich van chuyin (nong dp, dp nhdt, ty trpng, ), chung ta tra bdng de tinh ddpc cdc he sd can trd thuy ldc, dp dung cac cong Ddc tinh ky thudt: thdc ly thuylt / thdc nghiem d l tinh ton thatva Ldu ldpng cap Qe = 400 GPM = 91 m3/h; trang thdi ddng chdy Ap suat nddc dan ddng 84 PSI; Chilu sdu hut hs Tinh todn nhanh bang cdc chdong trinh = -10ft; Chenh cdt dp dau xa (Discharge head) Adh = 30 ft; Ldu ldpng hut cdc dai 350 GPM; Ldu chuyen dung: ngddi dung chi can nap cdc th6ng ldpng xa 750 GPM; Tieu chuan thilt kl HEX for sd kit cau, tinh chdt dung dich, dd chii*! TAP CHf CO KHf VIET NAM • Sd +2 (Thang +2 nam 2012) NGHIEN CUfU - TRAO DOI trinh se td ddng tinh todn vd dda kit qua (result, report) Tdn that cdt dp tren todn ddne: H = H + H Trong dd: Tinh todn bang phdPng phdp thi tich hdu han Ddy Id xu hddng ddpc nhilu nhd khoa hpc cung nhd cdn bd ky thudt dp dung [8,9], Ipi the noi bat cua phdPng phdp ndy la cho kit qud chinh xdc, nhanh chdng Hien tai hai phan mIm cd tinh nang md phdng ddng chdy ddpc dng dung nhieu hpn cd Id Cosmos vd Ansys, nhien gid thdnh mua phan mIm khd cao (hang chuc ngdn dd la) He thdng bOm dp suat thap thilt kl tren nen thilt kl CP sd cua LTI (LeTourneau Technologies, Inc (My)) cd tham khdo kit cau cua gidn khoan td ndng PVD I, II, III nen nhiem vu cua nhdm dl tdi Id kilm nghiem lai ldu ldpng, trang thdi ddng chdy vd trd ldc cua he thdng Vi vay, chung tdi dp dung phdPng phdp sd dung cdng thdc ly thuylt / thdc nghiem H^ tdng tdn that Hj- tdn that dpc dddng H^- tdn that cue bd Cdng thUc Darcy - Weisbach: (3) Trong dd: hj- ton that dpc dddng X - he sd sdc can dpc dddng 1, V, d, g - chieu dai dddng dng, van tdc ddng chdy, dddng kinh dng, gia tdc trpng trddng Cdng thdc Vaizebac: K = ^ g 2.2.2 Cd sd vd cdng thiic tinh todn Tinh todn thuy ldc dddng dng dda vao tdn that ndng ldpng tren tdng chieu ddi dddng dng Dddng dng dp suat thap cd dddng kinh Idn nhat la 6" (phdn dng mIm) Trong dd: (4) he - tdn that cue bd V - van tdc ddng chay g - gia tdc trpng trddng 2.2.3 Kit qud tinh todn Tdi heu [1,2] cho thay, dl gidi quylt bdi todn tinh todn thuy ldc cho dddng dng, ta sd dung Sd dung phdong phdp tinh todn dac trdng cdng thdc vd phdPng trinh eP bdn dddi ddy: ldu ldpng, nhdm tdc gia dd tinh todn ddpc tdn PhUdng trinh Bernoulli: that dpc dddng tren cdc doan dng cung nhd tren todn bd dddng dng, tinh ddpc cdc tdn that cue bd Z l + ^ + ^ = Z + - + ^ + ^v (1) tren dddng dng Qua dd, tinh todn ddpc cdc thdng y 2g '^ y 2g -w V y sd cua ddng chay qua dau phun vd tinh ddpc ldu ldpng hut cua dau phun o H = H, + H w Trong dd: H^ = z^ -|- ^ -h ^ ^ ^ - Cdt dp dau dng, H, = z, -{- ^ -I- ^ ^ - Cdt dp cuoi dng PhUdng trinh lUu lUdng: Q = VO) (2) Trong dd: dng Q- Ldu ldpng V- van tdc trung binh o) - dien tich tilt dien ddng chdy Ongmlm 6ngth^ H( so Reynolds Rcc 212079 313069 Trang thai dong chay Dongchay roi D6ng chay rii 1.21 0.50 Thjng s£ TT Ton thit cot ap hd (mHiO) Ton that qic bo h, (mHjO) 0,76 long ton thit ir&i diKmg ^ng Hw (mHjO) 1,26 T6ng t5n thit tren toan bo dndng 6ng I^HwOnHiO) t7 DpdocthiiylvcJ DID phnD 2.47 0,013 0,09 Cot ap tinh tai dau vao dau phun HI Tong cpt ap hiit cua diu phim NPSH (m) 6,1 10 Lun luong hiitQs (mlt) TAP CHf CO KHf VIET NAM V Sd +2 (Thdng +2 nam 2012) 73 Cf= NGHIEN ClJfU - TRAO D6\ KET LUAN Pl^^* 1^ y^" *^ ^^y^* ^^^^' '^'^ ^^y ^^^ ^^" P^"" (eductor) da chpn hodn todn chap nhdn ddpc Khi hoat ddng h | thdng bPm sue bun, bPm chim can dilu chinh ldu ldpng xudng Q = 400 GPM (90,9 m3/h) d cdt dp H = 220 ft (67 m) Nlu tang ldu ldpng Idn hpn mdc ndy thi trd life he thdng tang dpt xudt, khd ndng hoat ddng cua he thdng gidm di rat nhieu jvi^c du vi|e tinh todn thuy liic cho lie ^j^^^^g ^^^ ^^ s^gt thap, bdng cdc cdng thiic ly ^^^^^^ / ^^^^ ^^gj^j.^^ ^^ ^^^ ^^ ^hinh xac ^^^ ^^^^ ^^^^^ ^^ ^^^ pj^^p j^ ^ ^^^.^^ ^^^^ ^ ^^,^^ ^,^ ^^^ ^^.^^ ^ ^^ ^^ ^, ^ ^^^^ ^^^, Kit qud tinh todn ldu ldpng hut chi dat 91,40/0 so vdi chao hdng cua nhd sdn xudt Tuy nhien, van hdnh he thdng bom sue bun tren gidn khoan td ndng, thdi gian hut nddc khdng Trong thdi gian tdi, nhdm tdc gid se tiln hdnh mo phdng he thdng bPm dp sudt thdp tren cP sd phin mIm ANSYS d l cd cdc ddnh gid sdu vd sdt thifc hPn.*> Tai lieu tham khao: [1] Vu Duy Quang (2006), Thuy dpng ldc dng dung, NXB Xay ddng Ha Npi [2] Kixelep P.G (2010), Cam nang tinh toan thuy Idc, NXB Xay ddng Ha Npi [3] Ban ve hoan cdng (as built drawings) cua cac gian khoan td nang: PVD I (nam 2005), PVD II (nam 2007), PVD III (nam 2007), ENSCO 107 (nam 2005), 116 lack-up (nam 2007) [4] Ban ve thiet ke co sd (basic design) gian khoan td nang 90m nddc Cdng ty LeTourneau (My) lap giai doan 2009-2010 [5] Ban ve thiet ke gian khoan td nang 90m nddc PVSHIPYARD lap giai doan 2009-2011 [6] De tai cap Nha nddc "Nghien cdu thilt ke chi tiet, cdng nghe chi tao va ldp dat he thong bom sue bun tren gian khoan td nang 90m nddc'' (2011) [7] ABS Rules for building and classing mobile offshore drilling units (MODU) [8] Robert L.Sanks (1998), Pumping Station Design, Butterworth - Heinemann [9] Igor J Karassik, loseph R Messina, Paul Cooper, Charles C Heald (2008), Pump handbook - Edition 4th, McGraw-Hill Companies, Inc TAP CHf CO KHf VIET NAM • S6 1+2 (Thane 1+2 nam 2012) ... dinh vi gidn khoan td ndng d dai ddPng Gidn khoan sau chi tao vd thuy, ddpc tau keo lai dat den vi tri khoan Tai dd, cdc chdn gidn khoan ddpc cho tdi thim luc dia, chan dl gian khoan gan tilp... 1500suat thap tren gidn khoan td ndng 90m nddc 1900 tan cho mdi chdn Ddy Id mdt ldc ndng rat Tam Ddo 03, Viet Nam thilt kl, chi tao ddng kl cho qua trinh ndng chdn gian khoan ii-ia^ws«fli>ici... thong bOm dp suat thap dddng kinh 6" ndi td dng gdp tdi bich chd cua ong tren gian khoan td nang 90m nddc Tam Dao 03 4" tren de chong lun Hai dau dng mem co md 4"-6" vd cdn thu 6"x4" Tren de chdng