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THNG TIN TM TT V NHNG KT LUN MICA LUN N TIN S

Tn ti lun n: "Nghin cu dng cht lu trong ging nng cao hiu qu

khoan"Chuyn ngnh: Khoan v hon thin ging du kh M s: 62.53.50.01

H v tn nghin cu sinh:Phm c Thin Kha o to: 2007 - 2012

H v tn cn b hng dn:PGS.TS Cao Ngc Lm, PGS.TS V Xun Minh

Tn c s o to: Trng i hc M -a cht.

TM TTNHNG KT LUN MI CA LUN N

Vi kt qu nghin cu v dng cht lu trong ging vi hai kha cnh

nng cao hiu qu vn chuyn mn khoan trong thn ging ng v hiu qu

lm sch y ging,NCS c mt s kt lun sau:

1. Ta c th a ra mt phng php ton hc logic thit lp c

biu thc tn tht p sut do ma st cho cc loi cht lng khoan Newton, phi

Newton chy tng trong ct cn v khong khng vnh xuyn nu ta bit cbiu thc m t cht lng khoan , t c th a cht lng khoan phi Newton

thnh cht lng khoan Newton thng qua nht tng ng Newton, ng

ngha vi vic xc nh c ch chy ca cht lng khoan phi Newton mt

cch d dng.

2. Trong qu trnh khoan cc ging khoan b Nam Cn Sn v b Cu

Long hu ht cc trng hp cht lng khoan chy tng trong khong khng

vnh xuyn (ngoi tr nc v cht lng khoan c nht tng ng hoc

nh hn nc) v chy ri trong ct cn.

3. Quy lut tn tht p sut ma st ca dng cht lng khoan khi vn

chuyn mn v khng vn chuyn mn l khc nhau. Cht lng khoan mang ht

mn khi va tng t gi tr nh, lm gradp gim, nu tip tc tng va th gradp


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gim n mt gi tr no v bt u tng theo va. Cn cht lng khoan khng

mang ht th gradp lun tng khi va tng.

4. Trong qu trnh vn chuyn mn khoan cc ging khoan b Nam Cn

Sn v b Cu Long khi tng vn tc cht lng khoan trong KKVX n 1,3 m/s

lm gradient p sut gim v c bit gim nhanh gi tr nh hn 0,4 m/s. Gi

tr vn tc cht lng khoan trong KKVX lm gradient p sut c khong nh

hp l l t 0,7 n 1,3 m/s. iu ny khng nh vn tc cht lng khoan trong

KKVX hp l khi vn chuyn mn khoan l 0,7 n 1,3 m/s, gi tr gii hn

di ca vn tc cht lng khoan trong KKVX khng nn nh hn 0,4 m/s.

5. Vi cc thng s ca h thng tun hon c xc lp, loi dungdch

khoan s dng bit ta c th tm c iu kin ti u thy lc qua chongkhoan vi 3 thng s: cng sut thy lc ln nht; lc va chm y ln nht;

vn tc v ng knh l phun chong khoan ti u.

6. p sut bm ti u theo ch tiu ti u cng sut thy lc ca dng

cht lng khoan qua chong khoan ln hn nhiu so vi theo ch tiu ti u lc

va p y. Theo ch tiu cng sut ti u ca dng cht lng khoan qua

chong khoan ch p dng c chiu su nh n trung b nh cn theo ti u

lc va p y c th p dng c chiu su ln.


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SUMMARY INFORMATION NEW CONCLUSIONS OF PHILOSOPHYDOCTOR THESIS

Name of the thesis: Research on drilling fluid flow in well drilling to enhance

drilling efficiency

Major : Drilling and completion of oil and gas well Code: 62.53.50.01

Ph.D student : Pham Duc Thien Course: 2007-2012

Instructors : Assoc. Prof. Dr Cao Ngoc Lam, Assoc. Prof. Dr Vo Xuan Minh

University : University of Mining and Geology

SUMMARY NEW CONCLUSIONS OF THESIS

With results of research for drilling fluids flow in well drilling base on

two respect are improve cutting transport efficiency in vertical segment well

and cleaning cutting on bottomhole, the author have some conclusions:

1. Propose mathermatic menthod to establish equations friction pressure

loss for Newtonian, non Newtonian fluid flowing through drillpipe and annulus

well in lamilar regime. This from translate non Newtonian fluid to Newtonian

fluid by equivalent Newtonian viscosity.

2. In drilling wells in Nam Con Son and Cuu Long basin, most drilling

fluid are lamilar flow in annulus and tubulent flow in drillpipe.

3. Losses friction pressure of drilling fluid flow bring and non bring solid

cutting are different. The drilling fluid flow bring solid cutting as the annulus

velocity is increase, the pressure gradient decrease and then it increase. The

drilling fluid flow non bring solid cutting as the annulus velocity is increase, the

pressure gradient increase.

4. In cutting transport drilling wells in Nam Con Son and Cuu Long basin

as the annulus velocity is increase up to 1.3 m/s, the pressure gradient decrease


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and strong decrease at lower 0.4 m/s. The interval annulus velocity have low

pressure gradient is 0.7 to 1.3 m/s. The minimum shoud not lower 0.4 m/s.

5. With parameters of circulation system was established, kind of drilling

fluid are known, we can find condition bit hydraulic optimum base on three

parameters are maximum horsepower hydraulic, maximum hydraulic impact

force, optimum velocity, and optimum diameter of bit nozzoles.

6. The optimum pressure pumb following horsepower hydraulic criterion

large biger hydraulic impact force. The optimum horsepower hydraulic through

bit are used for low and medium depth, The optimum hydraulic impact force

through bit are used for high deep.

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