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[.]
Trang 1Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho"
CTNG DUNG PHl/ONG P H A P C A N B A N G V A T C H A T D I O A N H G I A 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 6 THU H 6 | DAU
Phan Trgng Toan, Phung Dinh Thuc
Cong ty Tham do va Khai thac Dau khi
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 processed 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 ratio
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 thanh 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 nay 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 thanh 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^
1 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 nay gpi la gie'ng dan pha, thu dugc chu yeu la d i u
2 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 khi gie'ng hoat ddng, Hinh 2:
Tam gie'ng
Vung chay
Bien dn dinh Bien dn dinh gia
Trang 2Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bach Hd "
- Vung dn dinh: Tren bien eua vung nay trong sudt thdi gian hoat ddng eua gie'ng, ap suit khdng thay ddi
- Vung chuyen tiep Transient: Profile ap suit trong vung nay ed dd ddc Idn
- Vung dn dinh gia: Tren bien eua vung nay ap suit giam cham, tuy nhien van tdc thay ddi ap suit nay la hang sd
3 Kha nang nao de khai thac tdi uu va gia tang thu hdi dau tU tru lugng dau cd trong tang chUa chua bao hoa, bien dn dinh gia ?
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:
1
k^c, dp
\ dp \ d~ p _ /.I(IK\ dp
Cdthe viet lai nhu sau:
Ldi giai tdng quat eua phuang trinh nay:
k dt
Trong dd:
La ham tich phan luy thua va
ES-x)^-\^~di
•' u
Akt
E,{x)
(1)
(2)
(2')
Trong vung dn dinh gia, tang ehUa chua bao hda pha diu, cd Idi giai sau:
P=/^,+iii^[i„(^)-(f,)]
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 trong thUa sd eudi cung vao trong ham Idga va de y den hieu Ung skin s, phuang trinh (4) trd thanh:
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):
Pd = Pth - Const * q
141.25z/ , 0 4 7 2 r
Const = '—{Ln
^-l-kh r
s)
(5) (7)
Trang 3Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho"
Vdi mdi gia tri thyc nghiem P,b, tCr phuang trinh (5), cd the xay dyng dugc mdt dudng thang nhu Hinh 3 Dudng thang nay 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 nay cung la mpt dudng thang nghieng it, thudng gpi la VLP (Vertical Lift Performance) Xem Hinh 4
Hinh 3
Diem I giao nhau cua hai dudng IPR va VLP la diem khai thac gie'ng dau Tai diem nay cho phep md gieng khai thac vdi luu lugng q^, ap suit day gie'ng P^ Neu bd qua mit mat do 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 thanh 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 P H A P CAN B A N G VAT CHAT; H $ S 6 THU H6|; KHAI T H A C TICH LOY
Phuang phap can bang vat chat dya tren dinh luat bao toan khdi lugng:
"Khdi lugng hydrocarbon trong ting chCra ban diu" - "Khdi lugng hydrocarbon khai thac dugc" = "Khdi lugng hydrocarbon cdn lai trong tang chUa"
Phuang phap can bing vat chit, ddi khi 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 trong ting chCra
Ting ehUa dau chua bao hda:
^ = exp(c(/^.-/^J)
He sdthu hdi dau:
V
Co^o+c.A,+c^
exp(c,(P.-/^J)-l
He sd thu hdi diu phu thudc vao dp giam ap dp: dp = P^ - P^^^
He sd thu hdi diu cho phep tinh luu lugng khai thac tich luy: Q^ = Qr
(8)
(9)
(10)
(11) (12) Can bing vat chit the hien trong edng thuc (12): Luu lugng khai thac tich luy la mdt ham eua dp
giam ap suit dp
Trang 4Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bqch Hd"
V LAP TRlNH T[NH T O A N C A C T H O N G S 6 G I ^ N G
1 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
- Ban kinh tang chua
- Chieu cao tang chUa
- He sd the tich thanh tao
- Dp IP rdng
- Dp nhdt chit Idng
- Dp thim
- Bao hda nude
- Ap suit dau gie'ng
- Ban kinh gieng khai thac
-Skin
• DO lieu nhap vao chifdng trinh nhWsau:
- Nhap tryc tiep qua man hinh trong tung TextBox, hoae
- Nhap tryc tiep qua man hinh Click phim "Calculate", hoae
- Nhap trudc qua mdt file trong 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 sao cho ket qua phu hgp thyc te, du lieu chpn Ipe gia dinh dat trong 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 T I OilData:
5651
745
53
1.1
0.19
1.7 8.2
0.34
3000 0.328
0
psi
ft
ft
res bbl/STB KhdngthUnguyen
cp
mD
KhdngthUnguyen
psi
ft
Khdng thU nguyen
C
0.129E-5
••b 1
745 j
h
53
i
O
0.19
Sw i
0.34 :
B
1.1
Pi
5651
s
0
: i 1
h
0.328
K
8.2
1^
1.7
Pdg
1 3000
Mdi ddng eua bang nay la sd lieu tinh cho mdt gieng, cd the tinh cho nhieu gieng theo thCr ty ngudi dung + Ddi vdi bang FieldVars:
Sd hang eua bang nay la tuy y Trong mdi opt la sd lieu thay ddi cua bien tuang Ung, ehuang trinh ty ddng phan biet khi dung tUng sd lieu cua bien Bao cao nay dua vi du vdi chin ddng cua bang
Trang 5Hdi thdo khoa hoc "Ndng cao he sd thu hdi ddu md Bqch Ho'
2 DOflieu ra chUdng trinh
- Luu lugng khai thac tich luy
Tru lugng dau ban diu trong 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 sao cho ket qua ra phu hgp thyc te nhit
- Chudng trinh ty ddng in ra 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 nhau
VI l/NG DUNG CHLTONG TRJNH T[NH
1 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 nay 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 ngay
- Luu lugng khai thac trung binh mdi ngay 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 nay khai thac khdng hieu qua
2 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:
- Dd thi nay 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 khi 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 nay lien quan tdi ma sat trong dng khai thac (Tubing), nang luang the & nang lugng tinh trong gie'ng Giai phap lam giam ma sat Tubing thugng dugc ap dung trong hoan thien gie'ng, dieu dd se giam mit mat ap suit tgi dau gie'ng, nhu the ap suit
Trang 6Hdi 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 trong Tubing: Nen dung Tubing cd cung mdt dudng kinh trong, ludn chdng sy lang can diu trong Tubing lam thay ddi dudng kinh Tubing Ket qua tinh tU chUdng trinh thyc hien trong giai doan khai thac ty nhien cua gie'ng khai thac dau Chuang trinh cung cho kha nang tinh luu lugng bam ep via
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Khao sat anh hUdng cua cac thong so gieng ttfi diem lam viec:
Di/ai day lan li/ot khao sat anh hi/ang tdi che do khai thac gieng cua Skin, ban kinh tang chira, ban kinh gieng, he so the tich via, do nhat, he so tham va do day tang chira
a Anh hi/ang cua Skin tai diem lam viec cua gieng khai thac:
Ket qua tinh va do thi i/ng vdi moi gia tri cua Skin cho a hai hinh ke tiep:
CALCUl A T T , H E ? U I T r.OB F A D H N D r P F N O r N T V A R I A N X - O N F PHAT.r
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Ket qua tinh cho thay Skin tang thi luu lugng khai thac giam
Vay giai phap edng nghe la lam giam Skin Mpi bien phap khai thdng ddng chay vung chan gie'ng deu lam giam Skin Cac hoat dpng khoan va hoan thien gie'ng tao ra vung chuyen tiep dem giua than gie'ng va tang chUa, ed dd din yeu, la nguyen nhan lam Skin tang
Trang 7Hoi thdo khoa hoc ''Ndng cao he so thu hdi ddu mo Bach Ho''
Cac gieng khai thac kich thich hien nay tao di/gc Skin am Gia tri cua Skin co the dat duac -2 den -5
b Anh huang cua ban kinh tang chira tai diem lam viec cua gieng khai thac:
Ket qua tinh va do thi irng vdi m6i gia tri cua ban kinh tang chira cho a hai hinh ke tiep:
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V J u c R o
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Ket qua tinh cho thiy ban kinh ting chCra tang thi luu lugng khai thac giam Dieu nay dua ra kinh nghiem la: Hay thu hdi triet de tru lugng dau vung can gie'ng Mdi gieng ehi thu hdi dau ed ke hoach vdi thdi gian dinh trudc, tuc la ban kinh ting chua eua gie'ng nay biet trudc tuang ung vdi thdi gian dd Cdn vdi ting chua vl md cin phai
bd tri nhieu gie'ng Tdng sd gieng phan bd trong tang chua vl md de khai thac het tru lugng dau la tinh dugc
c Anh hudng cua ban kinh gieng tdi diem lam viec cua gieng khai thac:
Ket qua tinh va do thi Ung vdi mdi gia tri eua ban kinh gieng cho d hai hinh ke tiep:
•anCQBggg
CAI c l J I ^ T f R f ^ M I T_rCiP r /
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Ket qua linh cho thiy khi ban kinh gieng tang thi luu lugng khai thac tang Thyc te cd Tubing khdng the qua Idn de khai thac vdi luu lugng Idn han luu lugng Idn kha di ma tang chCra ed dugc
MCrc dp anh hudng eua ban kinh gie'ng cd the tinh dugc theo dinh nghla:
r = re
Gie'ng Rich thich cd s = -2 hoae -6 thi rg = 7.4rghoac 403rg
Trang 8Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bqch Hd'
d Anh huang cua he so the tich via tdi diem lam viec cua gieng khai thac:
Ket qua tinh va dd thi Crng vdi mdi gia tri eua he sd the tich via cho d hai hinh ke tiep:
:iSi3aig\M'ii^\m^.^\mm ^^ u
CALCULATE R E S U L T FQA^EACH
IMOIPENI3ENJ_y.AB.IANTLQNE_PHA_S_E-flMWtfy Ratio
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[ l © ' i T * -"''™ H a " ! i i S ^ S S jjtwfcwa^jiyKio^ir.l a T » » / 1 p.wi»r-| B r r i » » ^ - | f ^ 7 f i ^ ^ i S S f ^ * 35i-=w
Ket qua tinh cho thiy he sd the tich via tang thi luu lugng khai thac giam
Nhu vay can phai giam thdng sd nay
D
Tytrpng: P„ = / ? „ , ( - ^ ) ; Hesdthe tich via: B^= B^.e''"^""-"^ • B^ i<^ p^ i c ^ p i
Nhung tang chCra cd ap suit gin vdi ap suit diem bpt (bubble) va diu thudc ting ehCra nay cd he sd nen nhe thi luu lugng khai thac tang
Lam giam B^ ddng nghla vdi giam p „ Phuang phap bam Gas ngheo (Lean Gas) xudng gie'ng lam giam mat dp dau va giam ap suit via, dugc biet den nhu la "Gas lift"
Phuang phap duy tri trudng ap suit via gin vdi ap suit diem bpt P^ la dac trung dien hinh lam giam ty trpng diu cung nhu giam he sd the tich via
Phuang phap bam ep nude xudng via dieu khien ap suit via gin vdi ap suit diem bpt la phuang phap ca ban hien nay lam gia tang thu hdi dau
e Anh hudng cua do nhdt tdi diem lam viec cua gieng khai thac:
Ket qua tinh va dd thi Crng vdi mdi gia tri cua dp nhdt cho d hai hinh ke tiep:
C A L C U L A I T R r r i U L T ( O R TACM I N D F P r N D r N T VARIANT-ONC PHASF
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Trang 9Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bach Hd"
Ket qua tinh cho thiy dp nhdt tang thi luu lugng khai thac giam Cin tim each lam giam dp nhdt de gia tang thu hdi dau
Pt
Cac phirang phap lam giam do nhat giong vdi lam giam B„ p, Vdi gieng dau co do nhdt Idn han 100cp can phai ap dung phuang phap lam giam do nhdt de gia tang thu hoi dau Nhurng gieng dau khai thac thuoc loai nay goi la khai thac "Thu hoi nhiet" (Thermal recovery)
f Anh huang cua he so tham tai diem lam viec cua gieng khai thac:
Ket qua tinh va do thi irng vdi mdi gia tri cua tham k cho d hai hinh ke tiep:
mamBsmasBm
C A L C U L A l & H £ S U L r m R h A C H I N 0 £ F ^ t N D h r 4 r v A R I A N r - O N t i F H A S b
R s c o m y Ratio [Conpjuo To Walking Poinl Ut IPR N n d |
* 4 J
3032 633333 J » r
; j r ; » 5 7 H 2 P 5 7 i
: « M ( » 3 3 » 3 3 3 3 ;
eiOT'wisT^sci *:;57coT;*63fiiEJ:;
7B;.SJ0&*3724351 2.77:59551 5E35^2E< 2
12 51! •tE704SJ>*2 l.07Mt«5SC5CIH: O:
1* ix7C54iO(i;it;o 2974>::*ro35ieE-02 12»;2^83736aC J 5 2 2 2 a a * e i 7 2 ? t < 2
24 1430332705:308 HM«:01KS53'3«:-0:
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t
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Ket qua tinh cho thiy he sd thim tang thi luu lugng tang He sd thim lien quan tdi eiu tao dia chit ting chUa, gia tri nay anh hudng rit rd tdi van tdc ddng chay va luu lugng khai thac cua dau trong tang chua
Cac phuang phap thyc te lam tang k cd anh hudng rd ret gia tang thu hdi diu Vi du tao gie'ng khoan xien lam tang dd thim ngang, khoan thdng cac ddi tham deu lam tang dang ke luu lugng khai thac
g Anh hudng cua do day tang chua tdi diem lam viec cua gieng khai thac:
Ket qua tinh va dd thi Crng vdi mdi gia tri eua dp day tang ehUa cho d hai hinh ke tiep:
prm|g|ai<^iAiigiai-.^im«EagB BE
Cp-O
1*11 J ^
33765 e
151i.e57l42-3;PJ
3 « 5 , 1 S C
m 7 ; X 3 3 3 J J 3 3 3
3 M G : I
i * a : 5 1
Recowty Ratio (CoMpoio ToWofking PoM OriPn Nral)
fl ji:"Jb7SMe:''iDua o
WS96b7*.M2f*l9 1 7/^i^Vr7F3^3ii XL
707»«gG55:2i9 ? 2 E 3 5 3 2 1 7 C M 6 3 I £ I E
73 'iS'^S^KVrm 19-'3334r '4343H-CC
W 94S19E4!E-K9 4 J1«1953:09::jCC-0:
W 1C6-;.33ej«4C20]0 :305W744l7C077i:CC V,73931iWX37 4 54M3332:'735:C-.'i2
H155!77«3:C*4/ " K - X l 7^37747 i::EJ3;
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Trang 10Hdi thdo khoa hoc "Ndng cao he sdthu hdi ddu md Bqch Hd'
Ket qua tinh cho thiy dp day tang chiJa tang thi luu lugng tang
Thyc te cin chpn vi tri gieng d nai tang chua trung va dp thim cao Vdi vi tri gieng da chpn dp day tang
ehCra la khdng thay ddi, tuy nhien ngudi ta thay ddi dugc dp day bieu kien cua tang chCra Bam ep nude ngoai
kha nang dieu khien ap suit via edn ed kha nang lam tang lugng diu chay ddn vao vung ting chCra quanh
gieng, lam tang dp day bleu kien cua ting ehUa
V I I K ^ T L U A N
Bao cao da trinh bay cd sd ly thuyet Crng dung phudng phap can bang vat chat de xay dyng chuang trinh
tinh cac thdng sd md khai thac diu thudc tang chua chua bao hda (Undersaturated) Tac gia da dung ehudng
trinh tinh cho gieng khai thac bat ky Theo ket qua tinh cac thdng sd khai thac, bao cao danh gia kha nang khai
thac md; neu kha nang chpn che dp khai thac tdi uu cho gieng khai thac, nham nang cao he sd thu hdi diu
Thdng qua khao sat anh hudng cua tUng thdng sd ky thuat tdi che dp lam viec cua gieng khai thac, bao cao
cung dua ra eae giai phap cdng nghe cho nang cao thu hdi diu
Cac phuang phap (vat ly) thyc te lam gia tang thu hdi dau deu nham thyc hien cac giai phap cdng nghe
ca ban nay
Bao cao cdn nhieu han che, xong vdi thdi gian cho phep khdng nhieu, bao cao cung da neu dugc mdt sd
kinh nghiem nhim danh gia kha nang khai thac va nang cao he sd thu hdi diu
VIII PHIJ LIJC
Ky hieu cac dai lugng vat ly dung trong bao cao:
Ky tiieu
P
Pdg
Pi
Pd
Pd
Pb P.b
dp
r
Tg
Tb
Ti
k
h q.qo
o
^
c,
y ngtila
Ap suit tang chCra tai ban kinh r
Ap dau gieng
Ap suit ting ehUa ban diu
Ap suit diu gie'ng
Ap suat day gieng
Ap suit tren bien
Odn vj
psi psi psi psi psi psi
Ap suit trung binh ting chCra psi
Dp lech ap suit psi Ban kinh tinh tu tam gieng, thudc ting chCra ft
Ban kinh gieng khai thac ft Ban kinh tdi bien tang chCra dn dinh gia ft
He sdthu hdi ft
He sd thim mD Chieu day tang ehCra ft
Luu lugng khai thac STB/d
Dp rdng, dp xdp fraction
Dp nhdt cp
He sd nen he thdng tdng cdng Psi'^