CN103742101B - A kind of technique of casing off stratum - Google Patents
A kind of technique of casing off stratum Download PDFInfo
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- CN103742101B CN103742101B CN201410000744.3A CN201410000744A CN103742101B CN 103742101 B CN103742101 B CN 103742101B CN 201410000744 A CN201410000744 A CN 201410000744A CN 103742101 B CN103742101 B CN 103742101B
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- Earth Drilling (AREA)
Abstract
The invention provides a kind of technique of casing off stratum, at least comprise the following steps: after 1) using complete first slough formation of bit drills, casing off is carried out to slough formation; 2) bored after first cavey formation bore 20-30 rice again, prepared tank 40 side dense glue and well is cleaned, circulate more than two weeks; Described dense glue is that 99.7% clear water and 0.3% caving control agent ZNP-1 form by weight ratio; 3) setting of casing, controls lowering velocity in setting of casing process, and often lower 30 sleeve pipes fill with magma in time; 4) moment of torsion of sleeve pipe in upper button process is 10KN.M; 5) well cementation is for amount, calculates accurately for amount before well cementation according to casing setting depth, examines, complete a spudding well after plug bruising according to for amount data budget cement plug thickness; 6) cemented the well Hou Ning 48 hours, bored cement plug, according to different stratum use Matched Drilling liquid carry out two spud in into, be drilled into target zone.The technical problem that the present invention effectively solves leakage, caves in, also increases substantially bit speed, shortens drilling period.
Description
Technical field
The present invention relates to drilling applications, be specifically related to a kind of technique of casing off stratum
.
Background technology
Gas prospect pit construct straight sieve anti-collapse be the most important thing, conventional straight sieve anti-sloughing technique mainly early stage aggregation composition formula, strengthening polymer rejection carries out anti-collapse, later stage suppresses well slough mainly through improving constantly drilling fluid density, density needs the drug dosage increasing coupling to regulate maintainability after improving, cause mud cost large, overall rate of penetration is low, and drilling period is long.Use the anti-collapse down-hole of conventional drilling liquid system to have a big risk simultaneously, Kuai Luo river, East, Gansu Province is very easily leaked, extend local and there is microcrack, carry anti-collapse being easy to of density and cause above-mentioned stratum leakage, leaking collapses causes down-hole complicated simultaneously, exploration well drilling strata geologic reservoir is in confused situation, also need to carry proportion according to well control situation, because Different Strata is to the paradox of density requirement, cause proportion construction window narrows, even cannot construct, down-hole has a big risk.Use that low solid polycondensation sulphur drilling fluid system rate of penetration is slow, drilling period is long, construction cost is high, and construction risk is large simultaneously.Along with the large-scale development of east, Gansu Province gas well, be badly in need of solving above contradiction, arrive the object reducing construction risk and fall this speed-raising.
Summary of the invention
The technical problems such as to there is the cycle long in order to solve prior art, and construction cost is high, and construction risk is large simultaneously, the invention provides a kind of technique of casing off stratum.
Technical scheme of the present invention is: a kind of technique of casing off stratum, is characterized in that: described technique at least comprises the following steps:
1), after using complete first slough formation of bit drills, casing off is carried out to slough formation;
2) bored after first cavey formation bore 20-30 rice again, prepared tank 40 side dense glue and well is cleaned, circulate more than two weeks; Described dense glue is that 99.7% clear water and 0.3% caving control agent ZNP-1 form by weight ratio;
3) setting of casing, controls lowering velocity in setting of casing process, and often lower 30 sleeve pipes fill with magma in time;
4) moment of torsion of sleeve pipe in upper button process is 10KN.M;
5) well cementation is for amount, calculates accurately for amount before well cementation according to casing setting depth, examines, complete a spudding well after plug bruising according to for amount data budget cement plug thickness;
6) cemented the well Hou Ning 48 hours, bored cement plug, according to different stratum use Matched Drilling liquid carry out two spud in into, be drilled into target zone.
In described step 2 well depth to be drilled more than 80 meters after strengthen cleaning, sweep once for every 40 ~ 50 meters.
Described step 1) is bored in first cavey formation process and is added that to account for weight ratio be that the caving control agent ZNP-1 of the anti-sloughing agent K-PAM and 0.4% of 0.2% is anti-collapse;
The formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV is 30s-32s, ρ ﹤ 1.02g/cm
3time:
0.1-0.2% polyacrylic acid potassium K-PAM, 0.2-0.4% caving control agent ZNP-1,0.5% potassium chloride KCL, surplus are magma.
The formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV ﹥ 40s, ρ=1.02-1.09g/cm
3time:
0.1% caustic soda NaOH, 2% salt tolerant mutant JMP-1,3% organic mulseal SFT-1,0.3% polyanion cellulose PAC, 2% fluosilicic filtrate loss reduction additive SF, 4% acid-soluble oil layer protective agent ZDS, 2% potassium chloride (KCl), 2% sodium formate HCOONa, 10% sodium chloride nacl, surplus are magma.
The formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV=40-45s, ρ=1.10-1.15g/cm
3time:
0.2% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 2% organic mulseal SFT-1, surplus are magma.
The formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV=50-55s, ρ=1.15-1.20g/cm
3time:
0.1% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 1% organic mulseal SFT-1,10% barite, surplus are magma.
Drill bit in described step 1) is the drill bit of 346mm.
Described FV is 30s-32s, ρ ﹤ 1.02g/cm
3time be applicable to YAN ' AN FORMATION, prolongation group; FV ﹥ 40s, ρ=1.02-1.09g/cm
3time be applicable to paper mill group, Buddhist monk's ditch, Liu family's ditch group; FV=40-45s, ρ=1.10-1.15g/cm
3time be applicable to Shi Qianfeng group, Shihezi Formation, Shanxi group, horse man ditch group, summer group stratum; FV=50-55s, ρ=1.15-1.25g/cm
3time be applicable to the finishing drilling of Xu Zhuan group.
The advantage that the present invention compares prior art is:
1, effectively solve river, Lip river leakage, straight sieve caves in.
2, effectively drilling fluid density is reduced.Original technical scheme protective casing envelope, to ring river, after straight sieve layer caves in needs drilling fluid density to be increased to 1.3-1.35g/cm
3stabilizing borehole, and density is more than 1.25g/cm
3the easy leakage of river, Lip river layer, causing the complex situations of leakage with well of collapsing; By technological improvement protective casing depth of setting changed to and drills straight sieve group 30 meters, eliminate river, Lip river layer, impact that straight sieve layer creeps into understratum, originally diamond thousand peak needs 1.25-1.3g/cm to target zone drilling fluid density
3, when creeping into now, drilling fluid density only needs 1.15-1.20g/cm
3, before comparatively transforming after technological transformation, on average reduce 0.05-0.1g/cm
3, effective guarantee low-density is crept into.
3, increase substantially bit speed, shorten drilling period.Celebrating spy 3 well drilling period is 56.13 days, and comparatively celebrate spy 2 well and shorten 40.79 days, rate of penetration is 6.11 ms/h, comparatively celebrates spy 2 well and improves 2.17 ms/h, improve 55.08%.
4, all gas spies of applicable Long Dong, gas drive a well.
5, remarkable in economical benefits.From enforcement " gasification Qingyang " strategy, gas well increases gradually, and this technology applies only individual well can save 350.8 ten thousand yuan, by the scope of construction item of order implication well the previous year 20, can save 7,016 ten thousand yuan altogether.The social benefit that speed-raising produces is inestimable especially.
Accompanying drawing explanation
Fig. 1: former planned well deep structure figure contrasts with the rear well depth structure chart of improvement;
Fig. 2: fall the many figure of block before former well depth structural change;
Fig. 3: without falling block figure after changing well depth structure.
Detailed description of the invention
For making those skilled in the art understand technical scheme of the present invention better, below the drawings and specific embodiments the present invention is described in further detail, but not as a limitation of the invention.
Embodiment 1
The technique on casing off stratum, at least comprises the following steps:
1), after using complete first slough formation of bit drills, casing off is carried out to slough formation;
2) bored after first cavey formation bore 20-30 rice again, prepared tank 40 side dense glue and well is cleaned, circulate more than two weeks; Described dense glue is that 99.7% clear water and 0.3% caving control agent ZNP-1 form by weight ratio;
3) setting of casing, controls lowering velocity in setting of casing process, and often lower 30 sleeve pipes fill with magma in time;
4) moment of torsion of sleeve pipe in upper button process is 10KN.M;
5) well cementation is for amount, calculates accurately for amount before well cementation according to casing setting depth, examines, complete a spudding well after plug bruising according to for amount data budget cement plug thickness; Calculate according to casing setting depth and accurately belong to techniques well known for amount, be not just described in detail here;
6) cemented the well Hou Ning 48 hours, bored cement plug, according to different stratum use Matched Drilling liquid carry out two spud in into, be drilled into target zone.
Described step 2) in well depth to be drilled more than 80 meters after strengthen cleaning, sweep once for every 40 ~ 50 meters.
Described step 1) is bored and can be added after in first cavey formation process that to account for magma weight ratio be that the caving control agent ZNP-1 of the anti-sloughing agent K-PAM and 0.4% of 0.2% is anti-collapse again.
The formula of the drilling fluid of described step 6 is made up of the raw material of following weight ratio:
1) performance: FV is 30s-32s, ρ ﹤ 1.02g/cm
3time:
0.1-0.2% polyacrylic acid potassium K-PAM, 0.2-0.4% caving control agent ZNP-1,0.5% potassium chloride KCL, surplus are magma.
2) performance: FV ﹥ 40s, ρ=1.02-1.09g/cm
3time:
0.1% caustic soda NaOH, 2% salt tolerant mutant JMP-1,3% organic mulseal SFT-1,0.3% polyanion cellulose PAC, 2% fluosilicic filtrate loss reduction additive SF, 4% acid-soluble oil layer protective agent ZDS, 2% potassium chloride (KCl), 2% sodium formate HCOONa, 10% sodium chloride nacl, surplus are magma.
3) performance: FV=40-45s, ρ=1.10-1.15g/cm
3time:
0.2% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 2% organic mulseal SFT-1, surplus are magma.
4) performance: FV=50-55s, ρ=1.15-1.20g/cm
3time:
0.1% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 1% organic mulseal SFT-1,10% barite, surplus are magma.
Embodiment 2
The present invention, in order to prevent based on the formation leakage of Luo He group with based on the formation collapse of straight sieve group, eliminates its risk brought construction in later period and the adverse effect to speed of application, and Matched Drilling liquid technology, improves bit speed simultaneously.Celebrating spy 3 well is prospect pit without a break, considers that this well is gas prospect pit, drilled well Duan Shen, drilling period is long, and straight compass will cave in serious after crossing long-time immersion, this river, block Lip river leakiness, and new stratum opened by later stage brill, new reservoir has certain risk, prevents from entering collapsing not only but also leak, the passive situation of invading not only but also leaking, have employed and directly use the above well section in casing off Yan'an, and the non-packing well section in bottom, use Solid Free, reduce drilling fluid density before comparatively using the technology, improve rate of penetration.
The technique on casing off stratum of the present invention, specific as follows:
1), after using bit drills to top, stratum, Yan'an, packing is carried out to the sleeve pipe on the straight sieve stratum on top, stratum, Yan'an: downhole safety when big hole creeps into should be noted.Drill bit in described step 1) is the drill bit of 346mm.
2), after entering stratum, Yan'an 20-30 rice after drilling straight sieve stratum, prepare tank 40 side dense glue and well is cleaned, circulate more than two weeks; Described dense glue is that 99.7% clear water and 0.3% caving control agent ZNP-1 form by weight ratio: a) spud in 30 meters and open backwater leakproof in top layer, and put and tiltedly beat directly, inclining prevention is excessive, enters under later stage sleeve pipe difficulty; B) well depth more than 80 meters after need strengthen cleaning, every 40-50 rice is swept once; C) anti-oblique, note leakproof, add thin sawdust leakproof with brill, drilling fluid viscosity 28-29 second, regularly must add and prevent unexpected sand from sinking to burying drilling tool bit freezing; D) straight sieve is anti-collapse, and adding magma weight ratio after drilling straight sieve stratum is that the caving control agent ZNP-1 of the anti-sloughing agent K-PAM and 0.4% of 0.2% is anti-collapse, viscosity 30-31 second; E), after entering stratum, Yan'an 20-30 rice after drilling straight sieve stratum, prepare tank 40 side dense glue and well is cleaned, circulate more than two weeks.
3) setting of casing, will prevent foreign material from falling in pipe during well head cleaning sleeve pipe screw thread, in setting of casing process, control lowering velocity, often lower 30 sleeve pipes fill with magma in time, prevent surge pressure change in well and make borehole well instability.
4) moment of torsion of sleeve pipe in upper button process is 10KN.M;
5) cementing truck keeps small displacement to circulate before coming, and well cementation, for amount, calculates accurately for amount before well cementation, examines, complete a spudding well after plug bruising according to for amount data budget cement plug thickness;
6) cemented the well Hou Ning 48 hours, bored cement plug, according to different stratum use Matched Drilling liquid carry out two spud in into, be drilled into target zone.
The present invention adopts two to open Matched Drilling liquid technology, and two spudding wells need to drill 11 stratum (see table 1):
Need after having bored cement plug to bore Yan'an, bored Yan'an and bored prolongation again, then toward understratum until target zone, order is Yan'an-prolongation-paper mill-Buddhist monk's ditch-Liu Jiagou-Shi Qianfeng-Shihezi-Shanxi-Ma Jiagou-Zhang Xia-Xu Zhuan successively, because drilling fluid compound method is identical, point 4 stages.
First stage: YAN ' AN FORMATION, prolongation group, the formula of described drilling fluid is made up of the raw material of following weight ratio: require property of drilling fluid: FV is 30s-32s, ρ ﹤ 1.02g/cm
3time:
0.1-0.2% polyacrylic acid potassium K-PAM, 0.2-0.4% caving control agent ZNP-1,0.5% potassium chloride KCL, surplus are magma.Here magma prepares as solvent, and collocation method is mixed by above-mentioned raw materials.
Following problem should be noted in implementation process:
1) YAN ' AN FORMATION has a large amount of coal tong layer, notes cleaning with dense glue in time;
2) prolongation group easily collapses, and keeps each glue anti-sloughing agent content that supplements to be not less than 0.3%.
Second stage: paper mill group, Buddhist monk's ditch, Liu family's ditch group, adopts two formulas opening Matched Drilling liquid to be made up of the raw material of following weight ratio:
Require property of drilling fluid: FV ﹥ 40s, ρ=1.02-1.09g/cm
3time:
0.1% caustic soda NaOH, 2% salt tolerant mutant JMP-1,3% organic mulseal SFT-1,0.3% polyanion cellulose PAC, 2% fluosilicic filtrate loss reduction additive SF, 4% acid-soluble oil layer protective agent ZDS, 2% potassium chloride (KCl), 2% sodium formate HCOONa, 10% sodium chloride nacl, surplus are magma.
Liu family's ditch group Formation bearing pressure is low, along with drilling fluid density, glues and cuts rising, pressure reduction leakage easily occurs, adopts above-mentioned formula, can carry out with brill leakproof.
Phase III: Shi Qianfeng group, Shihezi Formation, Shanxi group, horse man ditch group, a summer group stratum, two formulas opening Matched Drilling liquid are adopted to be made up of the raw material of following weight ratio:
Require property of drilling fluid: FV=40-45s, ρ=1.10-1.15g/cm
3time:
0.2% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 2% organic mulseal SFT-1, surplus are magma.
Other performance of this formula is: PV=15-20mPa.s, YP=3-8Pa, FL≤4ml, Kf≤0.06, PH=9-10.
Following problem should be noted in implementation process:
1) safeguard to be main.
2) easily there is mud drum in Shi Qianfeng group, supplements liquid measure in time, notices that strong rejection capability keeps, low sticky, lubricates excellent, and increase discharge capacity.
3) Shihezi Formation, Shanxi group coal band, with sticky (being greater than magma 20s) the highly dense slurry of height (higher than magma 0.1g/cm
3) cleaning, and increase discharge capacity.
4) Shi Qianfeng group, Shihezi Formation construction, should strengthen the shutoff of drilling fluid, rejection.By improving the content of temporary shielding blocking in drilling fluid, effective shutoff reduces the caving pressure on stratum.
Fourth stage (target zone): Xu Zhuan group finishing drilling, adopts two formulas opening Matched Drilling liquid to be made up of the raw material of following weight ratio: performance: FV=50-55s, ρ=1.15-1.25g/cm
3time:
0.1% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 1% organic mulseal SFT-1,10% barite, surplus are magma.
Other performance of this formula is: PV=15-20mPa.s, YP=3-8Pa, FL≤4ml, Kf≤0.06, PH=9-10.
Following problem should be noted in implementation process:
1), after upper tank circulation, open level Four solid controlling, ensure very to operate.
2) according to Properties Control adjustment performance.Every day, according to consuming off set drilling liquid 1-2 time, adjusts according to performance during off set drilling liquid measure.
3) after salt adding, dehydration easily increases, and before and after each salt adding, a circulating cycle wants dendrometry water to contrast, according to recording performance adjustment.When dehydration is excessive with salt tolerant mutant JMP-1, organic mulseal SFT for main treating agent reduces dehydration (when viscosity is low JMP-1).Acid-soluble oil layer protective agent ZDS is supplemented when solid phase is too low.
4) diligent survey performance, repeatedly adjust on a small quantity, retention is stablized.The diligent height visiting tapered shaped can sand with spade, when sand setting reaches 1/3, clear tapered shaped can.
5) density salt is improved.
Shown in Fig. 1-Fig. 3, the present invention, by improving the methods and applications drilling fluid of drilling well, efficiently solves the technical problem of well slough, leakage, and after well depth structural change, protective casing packing Luo He and straight sieve, leakage, caving in thoroughly is controlled.
Speed significantly promotes: find out from following table 2, and celebrating spy 3 well two is opened rear bit speed and obviously promoted, and rate of penetration improves 1.61 ms/h, and the mud cost simultaneously celebrating spy 3 also reduces greatly, and every meter reduces 82 yuan.
Table 2
Remarkable in economical benefits: celebrating spy 3 well drilling period is 56.13 days, and comparatively celebrate spy 2 well and shorten 40.79 days, rate of penetration is 6.11 ms/h, comparatively celebrates spy 2 well and improves 2.17 ms/h, improve 55.08%.From enforcement " gasification Qingyang " strategy, gas well increases gradually, and this technology applies only individual well can save 350.8 ten thousand yuan, by the scope of construction item of order implication well the previous year 20, can save 7,016 ten thousand yuan altogether.The social benefit that speed-raising produces is inestimable especially.
Polyacrylamide PAM in above-described embodiment, polyacrylic acid potassium KPAM celebrate Chemical Group Xianyang petrochemical industry Co., Ltd, factory site: the construction north of a road, Liquan County, Shaanxi Province section purchased from Xi'an is long; Caving control agent ZNP purchased from Zhenhua drilling fluid materials Co., Ltd, factory site: industrial park, Xinxiang, Henan; Caustic soda NaOH purchased from Ningxia Venus unit Chemical Group company, factory site: Qingtongxia City Qingtongxia town; Salt tolerant mutant JMP-1 purchased from Southwest Sichuan oil large-engineering Co., Ltd, factory site: No. 399, west section, numerous road great and mighty or powerful, high and new technology industrial development zone, Chengdu; Organic mulseal SFT-1 purchased from Henan Jinma Petroleum Technology Co., Ltd., factory site: western loop stage casing, Nanyang, henan oil field; Polyanion cellulose PAC celebrates Chemical Group Xianyang petrochemical industry Co., Ltd, factory site: the construction north of a road, Liquan County, Shaanxi Province section purchased from Xi'an is long; Fluosilicic filtrate loss reduction additive SF purchased from Hebei Guigu Chemical Co., Ltd, factory site: Technology Park, Guang Fu Silicon Valley, Yongnian County of Hebei province; Acid-soluble oil layer protective agent ZDS purchased from Chengdu Dedao Industrial Co., Ltd., factory site: Xin Yuan section, high and new technology industrial development zone, Chengdu; Potassium chloride (KCl) purchased from Beijing elder brother dragon great achievement Golmud Co., Ltd, factory site: Golmud City, Qinghai Province Da Buxun; Sodium formate HCOONa celebrates Chemical Group Xianyang petrochemical industry Co., Ltd, factory site: the construction north of a road, Liquan County, Shaanxi Province section purchased from Xi'an is long; Sodium chloride nacl purchased from middle salt Yulin salinization group, factory site: Yu He town, rate in Yuyang county.Chemical raw material in embodiment also directly can be buied from market.
Described FV is viscosity, and ρ is density, and PV is plastic viscosity, and YP is yield value, and FL is API dehydration, and Kf is for containing mud cake friction factor, and PH is pH-value.
The parts that the present embodiment does not describe in detail and technique belong to well-known components and the conventional means of the industry, do not describe one by one here.
Claims (8)
1. by the technique on casing off stratum, it is characterized in that: described technique at least comprises the following steps:
1), after using complete first slough formation of bit drills, casing off is carried out to slough formation;
2) bored after first cavey formation bore 20-30 rice again, prepared tank 40 side dense glue and well is cleaned, circulate more than two weeks; Described dense glue is that 99.7% clear water and 0.3% caving control agent ZNP-1 form by weight ratio;
3) setting of casing, controls lowering velocity in setting of casing process, and often lower 30 sleeve pipes fill with magma in time;
4) moment of torsion of sleeve pipe in upper button process is 10KN.M;
5) well cementation is for amount, calculates accurately for amount before well cementation according to casing setting depth, examines, complete a spudding well after plug bruising according to for amount data budget cement plug thickness;
6) cemented the well Hou Ning 48 hours, bored cement plug, according to different stratum use Matched Drilling liquid carry out two spud in into, be drilled into target zone.
2. the technique on a kind of casing off stratum according to claim 1, is characterized in that: in described step 2 well depth to be drilled more than 80 meters after strengthen cleaning, sweep once for every 40 ~ 50 meters.
3. the technique on a kind of casing off stratum according to claim 1, is characterized in that: described step 1) is bored in first cavey formation process and added that to account for weight ratio be that the caving control agent ZNP-1 of the anti-sloughing agent K-PAM and 0.4% of 0.2% is anti-collapse.
4. the technique on a kind of casing off stratum according to claim 1, is characterized in that: the formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV is 30s-32s, ρ ﹤ 1.02g/cm
3time:
0.1-0.2% polyacrylic acid potassium K-PAM, 0.2-0.4% caving control agent ZNP-1,0.5% potassium chloride KCL, surplus are magma.
5. the technique on a kind of casing off stratum according to claim 1, is characterized in that: the formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV ﹥ 40s, ρ=1.02-1.09g/cm
3time:
0.1% caustic soda NaOH, 2% salt tolerant mutant JMP-1,3% organic mulseal SFT-1,0.3% polyanion cellulose PAC, 2% fluosilicic filtrate loss reduction additive SF, 4% acid-soluble oil layer protective agent ZDS, 2% potassium chloride (KCl), 2% sodium formate HCOONa, 10% sodium chloride nacl, surplus are magma.
6. the technique on a kind of casing off stratum according to claim 1, is characterized in that: the formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV=40-45s, ρ=1.10-1.15g/cm
3time:
0.2% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 2% organic mulseal SFT-1, surplus are magma.
7. the technique on a kind of casing off stratum according to claim 1, is characterized in that: the formula of described drilling fluid is made up of the raw material of following weight ratio:
Performance: FV=50-55s, ρ=1.15-1.20g/cm
3time:
0.1% polyanion cellulose PAC, 1% fluosilicic filtrate loss reduction additive SF, 1% organic mulseal SFT-1,10% barite, surplus are magma.
8. the technique on a kind of casing off stratum according to claim 1, is characterized in that: the drill bit in described step 1) is the drill bit of 346mm.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005085586A1 (en) * | 2004-03-02 | 2005-09-15 | Halliburton Energy Services, Inc. | Improved well fluids and methods of use in subterranean formations |
| CN101182409A (en) * | 2007-10-27 | 2008-05-21 | 东营泰尔石油技术有限公司 | Anti-collapse circulative micro-foam drilling fluid or well completion fluid |
| CN102031094A (en) * | 2010-11-18 | 2011-04-27 | 原玉红 | Salt resistant high-temperature resistant solid-free environment-friendly well drilling and completing integrated working fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2005085586A1 (en) * | 2004-03-02 | 2005-09-15 | Halliburton Energy Services, Inc. | Improved well fluids and methods of use in subterranean formations |
| CN101182409A (en) * | 2007-10-27 | 2008-05-21 | 东营泰尔石油技术有限公司 | Anti-collapse circulative micro-foam drilling fluid or well completion fluid |
| CN102031094A (en) * | 2010-11-18 | 2011-04-27 | 原玉红 | Salt resistant high-temperature resistant solid-free environment-friendly well drilling and completing integrated working fluid |
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Effective date of registration: 20201029 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: CHINA NATIONAL PETROLEUM Corp. Patentee after: CNPC CHUANQING DRILLING ENGINEERING Co.,Ltd. Address before: Weiyang road 710018 Shaanxi city of Xi'an province Changqing No. 151 building room 1902 Patentee before: CNPC CHUANQING DRILLING ENGINEERING CO., LTD. CHANGQING WELL DRILLING GENERAL Co. |