g94 Phuong phap khao sat thiiy ddng luc d cac gigng khai thac tang mdng md Bach Ho ...
FHlTONG PHAP KHAO SAT THUY DONG LlJC 6 CAC GIENG KHAI THAC TANG MONG MO BACH HO CO DI THlTOTVG KHI CAO
TRONG THOI KY "TIEN BAO HOA"
Cao My Lgi, Biii Khic Cam, Nguyin Manh Dd Luong Diic Thien, Pham Xuan TTnh XNLD Vietsovpetro
TOM TAT
d md Bgch Hd, trong qud trinh khoan qua cdc tdng sdn phdm hodc khai thac tdng mdng thudng gap mdt sd giing cd di thu&ng dp sudt cao. Ddi v&i cdc giing ndy viec nghiin cim thuy ddng luc cdn nhiiu vdn di chua dugc gidi quyit, chua cd phuong phdp ndo ddp ung dugc yiu cdu. Trong bdi ndy tdc gid di xudt mdt tiin trinh khdo sdt thuy ddng luc cd khd ndng bdo ddm dugc do tin cdy ciia sd lieu, tinh todn dugc cdc thdng sd via chua cimg nhu qud trinh hogt ddng ciia ddng ddu vd ddng khi vdo giing dang khai thde. Ddi v&i cdc giing cd di thucmg khi cao cdn phdi kiim tra ky thiit bi ddu giing, ip thu ddu giing v&i dp sudt vugt 50% dp sudt mieng giing cao nhdt, xdc dinh lim lugng ddu, khi, dp sudt thiiy tinh, dp sudt mieng giing, v.v. tru&c khi tiin hdnh cdng viec khdo sdt thuy ddng luc. Ap sudt via vd dp sudt day dugc tinh tir dp sudt mieng giing vd dp sudt giua dng khai thde vd dng chdng. Di xdc dinh diim thd mdy do dp sudt vd nhiet do cdn do mat cdt nhiet hodc do dia vdt ly tru&c. Trong qud trinh khdo sdt tdng thi se tiin hdnh do lap cdc bu&c khdo sdt trong cdc gieng khai thde binh thu&ng. Di dung dugc du&ng cong chi thi mdt cdch chinh xdc, cdn phdi khdo sdt it nhdt 4 chi do ldm viec ciia giing. Hiin nay, XNLD Vietsovpetro dang sir dung phdn mim Pansystem di xu ly ducmg cong hdi phuc dp sudt nhung phdn mim ndy chi phii hgp v&i via ddu tdng Miocen - Oligocen cdn
khdng phii hgp v&i tdng ddu trong mdng. Vi vdy, tdc gid di xudt cdn phdi cd phdn mim m&i, hiin dgi han di gidi quyit cdc vdn di trin. Trong diiu kiin hiin nay, sau khi xdc dinh khodng xdm nhdp ciia khi vdo giing nin thd dng chdng, trdm xi mdng bit vung cd khi vd chi khai thde khodng cho ddu.
HIEN TUONG DI
T H U O N GKHI CAO (3 M O BACH HO
• • • •
Trong qua trinh khoan va khai thac md Bach Hd, XNLD Vietsovpetro da gap mdt sd gieng dau cd di thudng khi cao. Theo thdi gian xuat hien khi d cac gieng nay cd the chia ra lam 2 nhdm gieng kbac nhau:
•Nhom T. Trong qua trinh khoan vao cac tang san pham cd gap mdt vai trudng hgp gieng khoan di qua cac via khi hoae cac mii khi ldn. Khi tien hanh ggi ddng, thii via cung vdi dau cd mot lugng ldn khi di len mieng gieng lam cho ap suat mieng gieng cd the len tdi 150atm, tham chi 200atm hoae hon niia, ty le giiia luu lugng khi va dau do dugc len den 1.500. Hien tugng nay d md Bach Hd XNLD Vietsovpetro da gap d mdt
Tuygn tap bao cao Hdi nghj KHCN "30 nam Phu khi Viet Nam: Cff hdi mdi, thach thiic mdi' 895 vai gilng tang Oligocen tren va mdt s l gilng khoan vao phan cao nhat cua mat mdng vdm Trung tam md Bach Hd.
• Nhdm 2: Trong qua trinh khai thac tang mdng vdm trung tam mo Bach Hd cung da gap mdt sd trudng hgp di thudng khi cao. Mgt vai gieng khi dua vao khai thac cd luu lugng dau rat cao 600 - 900 t./ng.d. Sau mgt thdi gian dai lam viec dn dinh den mdt thdi ky luu lugng dau giam dot nggt cdn 2/3 miic binh thudng va cung liic dd mdt lugng ldn khi xuat hien, ty le giira luu lugng khi va dau do dugc len den
1.500. Ap suat mieng gieng vugt qua miic 150atm.
Nguyen nhan ciia hien tugng tren la d cac gieng khoan vao phan cao nhat cua mat mdng vdm Trung tam md Bach Hd trong qua trinh khoan xuat hien lugng ldn khi vao gieng. van de dat ra la khi nay d dau tdi, cd phai khi nguyen sinh nam giQ'a tang Oligocen va mat mdng hay do trong qua trinh khai thac vdm trung tam md Bach Hd ap suat via da giam xudng xap xi ap suat bao hda (tien bao hda) ma khi tach ra tu dau tao thanh cac mii khi ldn nam ngay cac khu vuc cao cua mat mdng?
Trong khi khai thac dau d thdi ky "tien bao hda", ap suat via da giam xudng xap xi bang ap suat bao hda cho nen vdi ap suat nay, bong bdng khi trong dau bat dau dugc tao thanh. Khi gieng khai thac lam viec d che do cdng nghe thi se cd ap suat day nhd ban ap suat via va nhd hon ap suat bao hda, do vay khi bat dau tach ra tir dau ngay tai vung ian can day gieng dang khai thac. Gieng cang cd thdi gian khai thac lau thi ap suat day gieng cang anh hudng sau vao via lam cho ap suat d nhiing diem sau trong via giam xudng dudi ap suat bao hda gay ra hien tugng khi tach ra tu dau trong via d khoang each ngay cang ldn tu gieng dang khai thac hay la dien tich khu vuc tach khi ngay cang ldn. Neu nhu liic dau khi chi tach d khu vuc ian can gieng dang khai thac thi lugng khi tach ra de dang di vao gieng theo ddng dau len mieng gieng. Nhung khi khu vuc tach khi da dii ldn cdng vdi via dau cd cau tao phiie tap khdng ddng nhat cho nen lugng khi tach ra khd cd the theo dau ra gieng dang khai thac dugc ma nd tich lai trong via vao cac tiii khi nhd hay cac
"bay", lau dan thanh nhieu. Them vao dd do linh ddng ciia khi rat cao cho nen chiing se ludn van ddng len eao ve phia phan noc via.
Hinh 1: Thoi ky dau cua "tiln bao hoa'
P>Pbh
Hinh 2: Thoi ky sau cua "tien bao hoa"
896 Phuong phap khao sat thiiy ddng luc d cac gieng khai thac tang mdng md Bach Ho ...
Mot yeu td niia la anh hudng tu cac gieng bom ep nude: vi do hda tan cua khi vao nude la rat nhd so vdi dau trong cimg mot dieu kien \"ia nen khi nude xuat hien se day ddn khi tir cac tiii khi nhd hoae cac "bay" vao mot viing nao dd va tao thanh cac mii khi nhan tao ldn hon, cac mii khi nhan tao nay cd xu hudng dich chuyen len tren va theo chieu day ciia nude tir cac gieng bom ep. neu gap cac cau tao cd du dieu kien chiia chan thi se tao thanh cac mu khi nhan tao dia phuong ldn nam rai rac trong via va chiing tang dan the tich, den mot chimg muc nao dd se anh hudng true tiep den cac gieng khai thac gan nd va tao ra hien tugng di thudng khi cao d cac gieng nay.
Trudng hgp thii 2 xay ra d tang mdng vdm Trung tam md Bach Hd: khi gieng dang khai thac vdi luu lugng dau dn dinh mot thdi gian dai sau dd khi xam nhap vao gieng vdi sd lugng rat ldn, sau mdt thdi gian khdng dai lugng khi nay tu het di va gieng lai lam viec dn dinh binh thudng. Mdt thdi gian sau, khi lai xam nhap vao gieng vdi sd lugng rat ldn, rdi lai het, rdi lai tiep tuc xuat hien khi xam nhap theo chu ky. Theo ddi ap suat via va ap suat day trong thdi gian khi xam nhap thay chiing tang len tir 8 - lOatm. Cdn khi het dgt khi xam nhap thi ap suat trd lai binh thudng, khi qui ve cung mdt do sau cua mat mdng thi thay phu hgp vdi gia tri ap suat cua cac gieng ian can. Dieu nay eho thay ap suat ciia mii khi cao ban ap suat trung binh cua via dau viing ian can gieng khoan nay. Vdi dac tinh tham kha tdt cua tang mdng md Bach Hd thi viec tdn tai mdt mii khi cd ap suat ldn hon 8 - lOatm phia tren va ngang vdi day gieng khoan nay khd cd the xay ra. Cd kha nang mii khi nhan tao dugc tao thanh nam sau trong via. Khi tach ra tir dau tiep tuc dugc tich vao mii khi tdi liic dii siic anh hudng true tiep tdi gieng dang khai thac. Lugng khi vao gieng len mieng gieng lam mat mot the tich khi ldn trong mu khi, liic nay mu khi khdng dii siic anh hudng tdi gieng nCra, hien tugng xam nhap khi ket thiic. Nhung qua trinh khi tach ra tir dau van tiep tuc dugc tich vao mu khi rdi tdi mdt liic nao dd lai dii sue anh hudng true tiep tdi gieng dang khai thac. Rdi hien tugng xam nhap lai mat di. Qua trinh nay sau mdt thdi gian se lai lap lai.
Hien tugng nay rat phiic tap ddi hdi phai theo ddi lien tue va tien hanh do mat cat ddng va mat cat nhiet de xac dinh khi xam nhap vao khoang nao trong than gilng.
Khi cho cac gieng cd di thudng khi cao nay lam viec vdi miic luu lugng dau tuong ddi ldn thi luu lugng khi ciing ldn nen rat khd khan trong cdng tac nghien ciiu thiiy lire gieng khoan. 0 cac gieng nay, XNLD Vietsovpetro da tien hanh do mat cat ddng va xac dinh hau bet lugng khi di vao gieng tir phan tren ciia khoang md via va dau di tu phan dudi ciia khoang md via. Neu ddng gieng mot thdi gian se thay hau nhu trong gilng hoan toan la khi. 6 phia dudi day gieng cd hien tugng tap dau xen ke tap khi, khi do mat cat nhiet nlu may d tap dau thi thu dugc nhiet do rat cao cdn may d tap khi nhiet do giam rd ret. Vdi hien tugng nay khi tien hanh khao sat thiiy ddng luc cung nhu trong qua trinh phan tich tai lieu thu dugc gap rat nhilu vin dk phuc tap.
Tuyin tap bao cdo H^i nghj KHCN "30 nam PSu khi Viet Nam: Cff hdi mdi, thdch thiic mdi" 897
Hinh 3: Anh huong chu ky ciia mu khi toi gieng dang khai thac
Anh hudng cua hien tugng di thudng khi cao den qua trinh khai thac dau:
XNLD Vietsovpetro hien khai thac dau la chinh, viec gap cac di thudng khi rat anh hudng den san lugng khai thac. O cac gieng nay thudng cd ap suat mieng gieng rat cao cho nen he thdng dau gieng, he thdng dan dau tdi binh tach deu phai tinh toan lai cho phii hgp vdi dieu kien an toan. Khi khi vao gieng se lam nhiet do day gieng giam di anh hudng xau den tinh chat vat ly ciia dau. Cac via khi va mii khi cd ap suat cao ban ap suat trung binh ciia viing dau ian can, gieng khai thac cho nen ddng dau tur via vao gieng gap trd ngai ldn (AP nhd di) them vao dd la vdi do linh ddng ciia khi cao gap nhieu ian dau (do nhdt eiia khi nhd hon dau den vai chuc ian) khien san lugng dau ciia gieng nhd di. Khi nhieu va ap suat ldn khi di qua binh tach thi viec tach dau va khi khdng the tdt dugc. Khi tach ra tir dau tao mii khi nhu vay neu khi nay theo gieng di len thi ap suat d mQ khi giam di keo theo la su tach khi manh cua dau tii be mat tiep xiie giiia dau va mG khi. Nhu vay, nang lugng via se bi anh hudng dang ke.
Tuy nhien, ngoai nhimg anh hudng khdng tdt neu tren, viee xuat hien di thudng khi d nhung gieng khai thac ciing cd y nghla tich cue vi khi len thi keo dau len cimg, lam cho van tdc ddng dau tang len.
Neu xac dinh diing khoang xam nhap cua khi cd the ngan ddng khi bang packer hoae chdng dng. Sau dd cd the su dung mot phan nhd khi dd bang each ban mot vai Id nhd qua dng chdng nhu cac van gaslift. Lugng khi nay se gdp nang lugng day ddng dau len mieng gieng. Dieu nay vira ban che dugc su mat mat nang lugng via vira cd lgi trong viee khai thac.
898 Phuong phap khao sat thiiy ddng luc d cac gigng khai thac tang mdng md Bach Ho
PHU^ONG PHAP KHAO SAT THUY DONG Ll/C PHU HOP VOI DIEU KIEN GIENG CO DI THU^OfNG KHI CAO
Cho den nay. ddi vdi cac gieng khai thac ciing liic vira cd ddng dau vira cd ddng khi vao gieng, viec nghien ciiu thiiy ddng lire cdn tdn tai nhieu van de chua dugc giai quyet, chua cd phuang phap nao hieu qua va, chinh xac dugc ap dung. De tinh toan cac thong so ve do tham, do dan ciia via rat phiic tap lien quan den cac tinh chat vat ly ciia dau va khi, cac dinh luat ve ddng chay dac biet kbac nhau tai ranh gidi dau - khi va tinh chat ciia dat da trong via. Vi vay, trong bao cao nay de nghi tien hanh khao sat thiiy ddng lire va tinh toan cac thdng sd cua via theo trat tu nhu sau:
Ddi vdi cac gieng dang khai thac cd di thudng khi cao, cdng viec khao sat thiiy ddng lire phai tuyet ddi tuan thu cac nguyen tac an toan chay nd. Trudc khi tien hanh phai kiem tra that ky cac thiet bi dau gieng, phai ep thii dau gieng vdi ap suat it nhat vugt 50% ap suat mieng gieng cao nhat cd the.
De lap ke hoach khao sat thiiy ddng lire d cac gieng cd di thudng khi cao trudc tien phai xac dinh dugc luu lugng dau va khi, ap suat thiiy tmh va ap suat mieng gieng. Ap suat via va ap suat day du tinh dugc tinh toan dua tren gia tri ap suat mieng gieng va ap suat giiia dng khai thac va dng chdng. Tien hanh do mat cat nhiet hoae do dia vat ly de xac dinh khoang nao trong phan md via ma khi tir dd xam nhap vao gilng dang khai thac. Tren CO sd dd xac dinh diem tha may do ap suat va nhiet do. De ddng khi khdng anh hudng nhieu tdi nhiet do do phai tha may sau vao trong viing dau.
Tren Hinh 4 rat ro khoang xam nhap cua khi vao gieng tu 3325m tdi chilu sau 3375m sau dd la khoang cua dau vao gieng. Ddi vdi gieng nay tdt nhat nen tha may do ap suat va nhiet do xudng sau dudi 3400m rdi tien hanh khao sat.
Khao sat cac gieng cd di thudng khi cao tien hanh vdi do chinh xac cao. N I U cd du dieu kien nen giir may do ap suat va nhiet do d do sau can thiet trong sudt qua trinh khao sat. 0 cac gieng nay chenh lech giira ap suat via va ap suat day rat nhd nen viec do lien tuc nay se loai tru dugc sai sd giira hai ian keo tha may.
Gieng BK7
140 135
I 130
125 120
- • — •
« — • — • -
3325 3345 3365 3385 3405 3425 3445 3465 3485 Chieu sau (m)
Hinh 4: So" do mat cat nhiet gieng BK7
Tuygn tap bao cao Hgi nghj KHCN "30 nam Phu khi Viet Nam: Cff hdi mdi, thach thiic mdi' 899 Trong qua trinh khao sat tong thi se tiln hanh lap lai ian 2 cac bude khao sat trong cac gieng khai thac dau binh thudng. Tiic la:
Cbl do khai thac —>• Dong gieng hdi phuc ap suat ^ • 4 - 5 che do khao sat -^
Ddng gilng hdi phuc ap suat ian 2 —>• lap lai 4 - 5 che do khao sat tren. Trinh tu cho gieng lam viec tir cbl do cdn khai thac nhd nhat den cdn khai thac cao dan tdi cdn khai thac cao nhat cd the sao cho luu lugng ciia che do sau cao gap 2 ian che do trudc. Sau khi ddng gilng thi cho gieng lam viec nguge lai tu cao xulng thap. Muc dich ciia viec nay la se dung dugc 2 dudng cong chi thi, neu chiing triing nhau chiing td phan day gieng da sach khdng bi anh hudng cua cac yeu td khae den kit qua phan tich tai lieu sau nay. Mdt ddi hdi khae nira la cac gieng nay khi lam viec cd rat nhilu yeu td anh hudng den do chinh xac ciia ket qua do nhu nhiet do thay ddi, thanh phan khi thay ddi, do cao va ldn cua ndn dau trong vung day gieng, v.v. cho nen mudn dung dugc chinh xac dudng cong chi thi can phai khao sat it nhat 4 cbl do lam viec ciia gieng.
P(at)
238 Vung Pd>Pbh
232
231
Vung Pd<Pbh
— I —
50 100 150 200 250
Hinh 5: Su phu thuoc giira Pdiy va Qahu gieng BK7
Dung dudng cong chi thi d cac gieng nay thudng chia ra lam 2 dudng: mdt theo dau cdn dudng kia theo khi. Dudng cong theo dau dung trong he true chenh ap - luu lugng dau (AP va Qd), dudng cong theo khi trong he true (AP^ va Qg). Tren dd thi dudng cong theo dau (Qd va AP) doan thang dac trung trong viing cd Pvia > Pbao hoa > Pday ^^ cong trong
v i i n g Pday < Pbao hoa-
Vl du tren cho thay khi gieng khai thac vdi luu lugng dudi MOmVngay thi ap suat day ldn hon ap suat bao hda, cdn gilng khai thac vdi luu lugng tren
140m7ngay thi ap suat day nhd hon ap suat bao hda (sir tach khi xay ra).
900
Phuong phap khao s^t thiiy dpng luc d cac gieng khai thac tang mdng md Bach HoGieng BK7 Qg(m3/ngay)
400000 500000
-500.00
-1000.00
-1500.00
-2000,00
-2500.00
-3000.00
Hinh 6: Su phu thuoc giira AP va Qgas gieng BK7
Vi du tren cho thay khi gieng khai thac vdi luu lugng khi dudi 300.000m^/ngay thi ap suat day ldn ban ap suat bao hda, cdn gieng khai thac vdi luu lugng khi tren 300.000m^/ngay thi ap suat day nhd hon ap suat bao hda.
Tren co sd hai dudng cong chi thi nay cd the xac dinh dugc che do khai thac tdi uu cho gieng nay la khai thac d che do cd cdn khai thac bang 13 mm vdi Qd <
MOmVngay va Qg < 300.000iTiVngay.
Tren dudng cong chi thi, neu he sd gdc thay ddi (khdng thang) tiic la k == Qd/AP thay ddi phai xem xet den tinh chat ciia eoleetor, do no dau va khi ciia eoleetor, anh hudng cua ap suat den k, h, do nhdt ciia dau tir che do nay sang chi do kbac ciing nhu anh hudng cua ap suat den he sd the tich, do hda tan cua khi vao dau.
Dac trung cua ddng chay khi cd ca ddng dau va khi se viit phuang trinh cho ddng dau va ddng khi rieng biet theo cdng thiic sau:
Ddi vdi dau ^ , Ink,h .AP Qd = — '' ''
Pj\n Rn
Ddi vdi khi Qg =
•a + -^]a^ +4bAp' 2bTrong do k^ - do tham ciia dau, hj - chieu day via dau, Rn - ban kinh vung nudi, Rg - ban kinh gieng khoan.
Vi du: vdi gilng BK7 cd Qd = 193m7ngay, hd = 120m, A? = 6,6lat, a = 0,46,
Rn = 200m, Rg = 0,08m thi kd = 213md.
X"y^n tap bao cao Hdi nghj KHCN "30 nam Dau khi Viet Nam: Cff hdi mdi, thach thiic mdi' 901 Dua tren kit qua thu dugc tir ddng gilng hdi phuc ap suat phat trien cdng thiic Diupiu cho dau se tinh dugc do tham kd, do din thiiy d, do dan ap x va khoang each tir gilng khai thac din mu khi L = .y/JAA^ .
Sau day xem xet mdt dudng cong hdi phuc ap suat thuc te tir khao sat gieng P401 md Bach Hd ciia XNLD Vietsovpetro:
Gilng khai thac cd Qd = 463,6m\ ap suk day = 219,95at, a = 0,408, j3 * = 2,32xl0"^ h e s d thi tich b = 1,55 l , h = 77m.
Dung dd thi dudng cong hdi phuc ap suat tren he true P-Logt cd dang sau:
Gieng P401
232
218
0.000 0.500 1.000 1.500 2.000 2.500 3.000 3.500 4.000 4.500 5.000
Logt
Hinh 7
Dung dudng thang a tiep tuyen vdi dudng cong hdi phuc ap suat.
-T' uu- - ' • .^ P2~P] 225.178-225.119 ^ 0 1 ^ Tinh he so goc 1 = t g a = ^-^—f-*— = —:rTzz—r^rrr— ^ 0,314. I g ^ - l g ^ 2.973-2.785 Do dan thiiy:
Dd tham:
Do dan ap :
2.\2Q.b 2.12x463.6x1.551 , o c . ^n^ / T.
s = ^ ^ = — = 4854,69dcm/cP / 0.314
k = a i = ^?5«?^lM^=0,257d = 257md
h 7700
902
Phuong phap khao sat thiiy ddng luc d cac gieng khai thac tang mdng md B g c h j j o ^X 0.257
pp* 0.408x2.32x10"
2.72 m7s Khoang each tdi mii khi:
L V3.14;^ = V3.14x2.72x3657 = 176.65m
De xii ly dudng cong hdi phuc ap suat, hien nay XNLD Vietsovpetro dang diing phan mem Pansystem. Phan mem nay phii hgp vdi via dau tang Miocen va Oligocen nhung vdi tang mdng vdm Trung tam md Bach Hd cd thdi gian hdi phuc ap suat rat nhanh thi khdng xu ly dugc, nhat la trong trudng hgp gieng khai thac ciing liic vua cd ddng dau vira cd ddng khi vao gieng. Cung vi du tren (dudng cong hdi phuc ap suat gilng P401) neu dimg phan mem Pansystem de xu ly thu dugc ket qua nhu sau:
100
Delta P (psi)
10
1
Z/y^
Quick Match Results Radial homogeneous Infinitely acting Constant compressibility Cs = 5 35 bbl/psi K =312.294 md S =-5,1984 Pi -264.3382 ka/cm2
y
8
0.01
Loq-Log Plot
^ . i ' ^ ^ „ „ „ „ c ™ » - « f S ' J ^ ^ ^ " = °» '•°"°"'°°°°°
\'
.
0.1 Equivalent Time (tiours) - Tp=6.3474
. „ . „ . . . o . . < , . = ™ = - , — — - ^
'i
ft)
1
0
Hinh 8 KET LUAN VA DE NGHI
Ddi vdi cac gieng cd dj thudng khi cao ddi hdi phai khao sat ti mi va chinh xac,
phuong phap khao sat tren cd the dap iing dugc miic do tin cay ciia tai lieu, tinh toan
dugc cac thdng sd via ciing nhu qua trinh boat ddng ciia ddng dau va ddng khi vao
gieng dang khai thae. Nhung phuong phap nay ddi hdi thdi gian khao sat keo dai, phai
lap di lap lai cac che do khao sat, dieu nay se mat nhieu cdng lao ddng va anh hudng
den san lugng khai thac chung cua toan md. Trong dieu kien hien nay ciia XNLD
Vietsovpetro thi viec giu may do ap sudt va nhiet do dudi day gieng sudt qua trinh
khao sat se nay sinh nhilu van dl phiic tap, nhat la trong dieu kien ap suat va nhiet do
cao may dien tu se rat de hdng hde.
Tuygn tap bao cao HQi nghj KHCN "30 nam Phu khi Viet Nam: Cff hdi mdi, thach thiic mdi'
903 Khi gilng khai thac cd luu lugng dau va khi ldn, ap suat mieng gilng cao, can phai cd he thdng binh tach khi ap suat cao dl thu dugc ket qua do chinh xac.
Ddi vdi viec xii ly tai lieu dl thu dugc ket qua cd do tin cay cao, can phai xac djnh chinh xac cac thdng sd vat ly ciia dau va khi (ty trgng, do nhdt, he sd the tich, do hda tan ciia khi vao dau, v.v.), tinh chat vat ly ciia hdn hgp dau, khi tham chi cd ca nude khi ap suat day va ap suat via cd gia tri cao hon va thap hon ap suat bao hda. Xac dinh dac tinh ddng chay ciia dau, khi, nude d vimg chiia dau, khi, nude va sir thay ddi ciia cac dac tinh nay khi ddng chay d be mat ranh gidi giiia chat long va khi. Khi gieng khai thac d vimg can day gieng cd the tao thanh ndn dau (hoae ndn nude) ddi hdi phai xac dinh kich thudc, dac tinh thuy ddng ciia ndn dau, nude nay, v.v.. Tat ca nhirng yeu td tren chi giai quyet dugc bang mdt phan mem may tinh chuyen dung ma hien nay phan mem Pansystem khdng the dap iing dugc, ve lau dai can phai mua phan mem mdi de giai quyet cac van de tren.
Trong dieu kien hien nay va vdi muc dich ciia XNLD Vietsovpetro khai thac dau la chinh thi sau khi xac dinh chinh xac khoang xam nhap ciia khi vao gieng nen tha dng chdng, tram xi mang bit vung cd khi lai, chi khai thac d khoang cho dau ma thdi.
TAI LIEU THAM KHAO