CN112625662A - Ultrahigh-temperature high-density drilling fluid and preparation method and application thereof - Google Patents
Ultrahigh-temperature high-density drilling fluid and preparation method and application thereof Download PDFInfo
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- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
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Abstract
The invention relates to an ultrahigh-temperature high-density drilling fluid which comprises a high-temperature resistant dispersing agent, an ultrahigh-temperature filtrate reducer, a lubricant and an anti-collapse agent. The drilling fluid of the invention has a density of 2.4g/cm3The temperature resistance can reach 240 ℃, and the high-temperature-resistant high-pressure-resistant high-temperature-resistant high-pressure-.
Description
Technical Field
The invention belongs to the field of petroleum and natural gas exploration and development drilling, and particularly relates to an ultrahigh-temperature high-density drilling fluid as well as a preparation method and application thereof.
Background
With the increasing world energy demand, the drilling target gradually turns to the deep stratum, and the probability of drilling the ultra-high temperature and high pressure stratum is higher in the drilling process of the deep stratum. In the deep ultra-high temperature and high pressure stratum environment, the drilling fluid generally has the problems of poor rheological property, difficult regulation and control, increased high temperature and high pressure water loss, barite settlement and the like, so that the underground complex occurrence is caused.
In the technical aspect of high-temperature-resistant high-density water-based drilling fluid, the highest application temperature reaches 243 ℃, and the density is generally 1.5-1.8 g/cm3(ii) a The highest application density reaches 2.60g/cm3But at a temperature of less than 180 ℃. The ultrahigh-temperature high-density drilling fluid system successfully applied on site comprises: high density polymer system (former Soviet Union) with a density of 1.85g/cm at 205 ℃ in the autumn Ming 6 well3ENVIROTHERM SYSTEM (McBar) Density 2.24g/cm3The temperature is 200 ℃, the application temperature of Pyro-Drill system (Beckhols) in south Australia Kuebu basin reaches 234 ℃, and the density is 1.91g/cm3And a high temperature resistant water-based drilling fluid duratem system (MI-Swaco). These water-based drilling fluid systems generally have similar compositions, i.e., high temperature resistant polymers, high temperature diluents, etc. Such as Pyro-Drill drilling fluid systems, consisting of Chemtrol X (fluid loss reduction), Poly-Drill (fluid loss reduction), Mil-Temp (dilution), Keam-Seal Plus (viscosifying, water loss control), Pyro-Trol (improving inhibitive and lubricity), etc. In the aspect of improving the temperature resistance of the high-density drilling fluid, great attention is paid to the development of special high-performance products, such as fluid loss additives Driscal D, Driscemp, Poly-Drill and the like, and diluents Desco, Drill-thin, All-Temp and the like.
In the aspects of ultra-high temperature and high density drilling fluid treating agents and system research in China, the treating agent for the 240 ℃ ultra-high temperature resistant water-based drilling fluid appears. In the aspect of single temperature and density indexes, some achievements can be comparable to the international advanced level. High temperature, high density wells drilled, e.g. 1 moh depth well having a bottom temperature of 173 ℃ and a density of 2.10g/cm3(ii) a The temperature resistance of 1.2g/cm is up to 236 ℃ in the secretory depth 1 well3Polysulfonate drilling fluid(ii) a Shengke 1 well, well depth 7026m, bottom temperature 235 deg.C, maximum density 1.85g/cm3Foreign high temperature resistant products Driscal D and Soltex are introduced into the polysulfonate drilling fluid system. The medium petrochemical industry develops the temperature resistance of 150 ℃ and the density of 2.89g/cm3The drilling fluid system of (1). However, in the aspect of an ultra-high temperature and high density drilling fluid system in which high temperature and high density exist simultaneously, foreign core products are introduced to form the ultra-high temperature and high density drilling fluid system on the basis of the use of traditional treatment agents, the comprehensive performance of the corresponding drilling fluid cannot completely meet the field requirements, and particularly, the sedimentation stability of the drilling fluid under high temperature and high density is not good, so that complex accidents of drilling tool jamming and even drilling tool burying are caused seriously, and great potential safety hazards are brought. The Ordovician reservoir in the Xinjiang Shunto well region is buried deeply, the formation temperature is high, the pressure of a producing layer is high, the conventional polymer treating agent is easy to degrade, and the drilling fluid is gelatinized and thickened due to high-temperature dispersion of clay, so that the rheological property and the sedimentation stability of the high-density drilling fluid are poor, and the water loss is difficult to control. In practical application, a vicious circle of weighting → thickening → viscosity reduction → weighting agent sedimentation → density reduction → re-weighting appears frequently at ultrahigh temperature in the medium-high density drilling fluid system, and the 'cooperation' regulation and control difficulty of rheological property, sedimentation stability and HTHP fluid loss performance is large.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an ultrahigh-temperature high-density drilling fluid system with excellent performance in a first aspect, wherein an ultrahigh-temperature fluid loss additive and a high-temperature-resistant high-density dispersant are used as core treating agents, and the density reaches 2.40g/cm3The temperature resistance reaches 240 ℃, the regulation and control of the high-temperature rheological property and the sedimentation stability of the drilling fluid and the effective control of the high-temperature and high-pressure filtration loss can be realized, the problems of poor rheological property, difficult regulation and control and maintenance, large high-temperature and high-pressure water loss, barite sedimentation and the like of the drilling fluid commonly existing in the deep ultra-high-temperature and high-pressure stratum environment are solved, and the complex underground occurrence is avoided.
The invention also provides a preparation method of the drilling fluid.
In a third aspect the invention provides the use of a drilling fluid.
According to the first aspect of the invention, the ultrahigh-temperature high-density drilling fluid comprises 0.2-10 parts of high-temperature resistant dispersant, 0.1-10 parts of ultrahigh-temperature fluid loss additive, 0.5-10 parts of lubricant, 0.2-10 parts of anti-collapse agent, 0-10 parts of sulfonated lignite, 0-10 parts of lignite resin, 0.1-5 parts of pH value regulator, 0.2-5 parts of bentonite and 500 parts of weighting agent, wherein the water is 100 parts by weight.
According to some embodiments of the invention, in the drilling fluid, based on 100 parts by weight of water, the high temperature resistant dispersant is 0.5-5 parts, the ultrahigh temperature fluid loss additive is 0.2-6 parts, the lubricant is 1-5 parts, the anti-collapse agent is 0.5-6 parts, the sulfonated lignite is 1-6 parts, the lignite resin is 1-6 parts, the pH value regulator is 0.2-3 parts, and the bentonite is 0.5-3 parts.
According to some embodiments of the invention, in the drilling fluid, the high temperature resistant dispersant is 1-3 parts, the ultrahigh temperature fluid loss additive is 0.5-3 parts, the lubricant is 2-4 parts, and the anti-collapse agent is 2-4 parts based on 100 parts by weight of water.
The weighting agent is 150-500 parts in the invention, which means that different parts by weight of the weighting agent are added according to different densities of each well.
In some embodiments of the present invention, the ultra-high temperature high density drilling fluid comprises 100 parts by weight (w/v) of water, and the following components:
according to some embodiments of the invention, the high temperature resistant dispersant comprises the reaction product of an organic anhydride, a vinyl-containing sulfonate salt, and a sulfonated phenolic resin.
According to some embodiments of the invention, the high temperature resistant dispersant is high temperature resistant dispersant SMS-H. The high-temperature resistant dispersing agent SMS-H is a low-molecular-weight polymer containing sulfonic groups and a large number of hydroxyl groups, has certain surface activity, can be effectively adsorbed on the surfaces of weighting agent particles at high temperature, remarkably reduces the increase of the viscosity, yield value and gel strength of drilling fluid caused by the addition of a large number of barite, and enables the drilling fluid to be properly dispersed so as to have proper rheological property and certain capacity of reducing the filtration loss.
According to some embodiments of the present invention, the ultra-high temperature fluid loss additive is a sulfonated phenolic resin graft modified polymer using graft copolymerization and micro-crosslinking techniques. The function of the drilling fluid is to reduce the high-temperature and high-pressure filtration loss of the drilling fluid, but the viscosity of the drilling fluid system is not obviously improved.
According to some embodiments of the invention, the ultra high temperature fluid loss additive is SMPFL-UP.
According to some embodiments of the invention, the lubricant comprises one or more selected from the group consisting of extreme pressure lubricants, crude oil, and graphite.
According to some embodiments of the invention, the lubricant comprises a lubricant selected from the group consisting of SMJH-1. The lubricant SMJH-1 is a modified ester lubricant containing extreme pressure elements.
According to some embodiments of the invention, the anti-collapse agent comprises one or more selected from the group consisting of resinous anti-collapse agents and bituminous anti-collapse agents. According to some embodiments of the invention, the anti-collapse agent comprises a compound selected from anti-collapse SMNA-1. The anti-collapse agent SMNA-1 is a plugging anti-collapse treatment agent which is developed by an oil-soluble framework material through organic reactions such as coupling, substitution, crosslinking and the like and has the functions of high-temperature broad-spectrum deformation, elastic plugging, wall bonding and the like.
According to some embodiments of the invention, the bentonite comprises one or more selected from the group consisting of calcium bentonite, magnesium bentonite and sodium bentonite.
According to some embodiments of the present invention, the sodium bentonite has the function of providing the drilling fluid with good colloidal stability, so that the drilling fluid can obtain relatively stable viscosity and fluidity, and a proper amount of bentonite and barite jointly form a basic colloidal stability system, so that the suspension stability of the drilling fluid can be improved.
According to some embodiments of the invention, the pH adjusting agent comprises one or more selected from the group consisting of sodium hydroxide, potassium hydroxide and sodium carbonate.
According to some embodiments of the invention, the weighting agent comprises one or more selected from the group consisting of calcium carbonate, barite, iron ore fines, and galena fines.
According to some embodiments of the invention, the drilling fluid weighting agent is first-grade barite powder meeting industry standard (Q/SH0041-2007) and has a density of 4.2-4.3 g/cm3Without any surface treatment or surface modification.
According to a second aspect of the invention, the preparation method of the drilling fluid comprises the following steps:
(1) adding bentonite into water to obtain bentonite slurry, and preferably maintaining for 12-36 hr;
(2) adding an ultra-high temperature fluid loss additive into the bentonite slurry obtained in the step (1) to obtain mixed slurry A;
(3) adding a high-temperature resistant dispersing agent, sulfonated lignite, lignite resin, a lubricant, an anti-collapse agent and a pH value regulator into the mixed slurry A obtained in the step (2) to obtain mixed slurry B;
(4) and (4) adding a weighting agent into the mixed slurry B obtained in the step (3) to obtain the drilling fluid.
In some embodiments of the invention, the drilling fluid is prepared by the following method:
(1) preparing bentonite slurry: adding the bentonite into water to prepare bentonite-based slurry, and maintaining;
(2) preparing the drilling fluid: and adding the filtrate reducer SMPFL-UP into the cured bentonite-based slurry under stirring, adding the components including the dispersant SMS-H, the sulfonated lignite, the lignite resin, the lubricant SMJH-1, the anti-collapse agent SMNA-1, the pH value regulator and the like under stirring after the filtrate reducer SMPFL-UP is dissolved uniformly, adding the barite after the filtrate reducer SMH-H is dissolved uniformly, and stirring for 20min to obtain the ultrahigh-temperature high-density drilling fluid.
The ultra-high temperature high-density drilling fluid provided by the invention can be applied to deep wells and high-pressure formations (the drilling fluid density reaches 2.4 g/cm) with high bottom temperature (240 ℃)3) And (4) drilling construction. The drilling fluid of the invention is highGood temperature rheological property, low high-temperature and high-pressure filtration loss, stable settleability and excellent high-temperature stability.
Detailed Description
The invention will now be further illustrated by means of specific examples, but it will be understood that the scope of the invention is not limited thereto.
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not to be construed as limiting the invention in any way.
The evaluation method comprises the following steps:
(1) the method for evaluating the performance of the ultrahigh-temperature salt-resistant drilling fluid refers to the national common people's republic of China industry standard ZB/TE 13004-90 (drilling fluid test program).
(2) Stability of sedimentation
The prepared high-density drilling fluid is rolled and aged for 16 hours in a high-temperature roller furnace at a specified temperature, then is placed in a constant-temperature drying box (a high-temperature aging tank is vertically placed) and is kept standing and aged for a certain time at the specified temperature, the high-temperature aging tank is kept vertically placed when the temperature is reduced, the tank is opened carefully, the liquid level is not shaken, the slurry is not stirred after the tank is opened, the slurry is divided into half volumes of the upper layer and the lower layer, the density is measured after the slurry is respectively stirred, the density is recorded as rho 1 (upper layer) and rho 2 (lower layer), and the SF value (sedimentation factor) is calculated. And (4) mixing the slurry after the density is measured, and measuring the rheological property and the fluid loss property after stirring.
The source of experimental raw materials is as follows:
bentonite: bohai drilling mud Corp;
high temperature resistant dispersant SMS-H: the preparation method of the Chinese petrochemical petroleum engineering technical research institute comprises the following steps:
(1) 10 parts of phthalic anhydride and 10 parts of sodium styrenesulfonate were added to 100 parts of water in this order with stirring at 200r/min, and the temperature was raised to 60 ℃ to obtain a mixture A.
(2) And (3) heating the mixture A to 75 ℃, adding 10 parts of sulfomethyl phenolic resin into the mixture A under the stirring condition of 200r/min, and continuously stirring for 0.5h to obtain a mixture B.
(3) And cooling the compound B to 30 ℃, adding 1.2 parts of formaldehyde into the mixture B under the stirring condition of 200r/min, and continuously stirring for 40min at 30 ℃ until the mixture is uniform to obtain a mixture C.
(4) Transferring the mixture C to a closed container, introducing nitrogen, heating to 60 ℃, and reacting for 1h to obtain a mixture D.
(5) And drying the mixture D at 120 ℃ for 16H, crushing, and sieving by using a 20-mesh sieve to obtain the dispersing agent SMS-H.
Ultra-high temperature fluid loss additive SMPFL-UP: the preparation method of the Chinese petrochemical petroleum engineering technical research institute comprises the following steps:
dissolving 5 parts of sulfonate polymer (PFL-L, China petrochemical petroleum engineering technical research institute, industrial product, molecular weight 20 ten thousand, chain link content containing sulfonic acid group 45%) in 100 parts of water, and uniformly stirring; adding 5 parts of sulfomethyl phenolic resin (SMP-2, industrial product of Chongqing Daqi oilfield chemical Co., Ltd.) into the polymer solution, and stirring uniformly; adding 0.6 part of formaldehyde under the stirring condition, stirring at room temperature for 15min, transferring to a closed container, introducing nitrogen, heating to 60 ℃, and reacting for 2h to obtain the sulfonated phenolic resin graft modified polymer filtrate loss reducer SMPFL-UP.
Lubricant SMJH-1: the specific preparation method of the Chinese petrochemical petroleum engineering technology research institute is disclosed in Chinese patent CN 104342090A;
anti-collapse agent SMNA-1: the specific preparation method of the Chinese petrochemical petroleum engineering technology research institute is disclosed in Chinese patent CN 107090279A;
lignite resin: shandongdi Shunyuan Petroleum science and technology Co., Ltd;
sulfonated lignite: chengdu Chuanfeng chemical, Inc.;
barite: produced by Anxian Huaxi mineral powder Co., Ltd, and having a density of 4.3g/cm3；
Example 1
The density was 2.40g/cm3The ultrahigh-temperature high-density drilling fluid comprises the following components in parts by weight based on 100 parts by weight of water:
preparing sodium bentonite slurry according to the component ratio, aging for 24 hours, adding the ultrahigh-temperature filtrate reducer SMPFL-UP under high stirring, adding the dispersant SMS-H, the sulfonated lignite, the lignite resin, the lubricant SMJH-1, the anti-collapse agent SMNA-1 and the sodium hydroxide after uniform dissolution, stirring until uniform dissolution, adding the barite powder under stirring, and testing the performance of the drilling fluid before aging after high stirring for 20 minutes. The ultrahigh-temperature high-density drilling fluid prepared by the method is put into a high-temperature aging tank, rolled at 220 ℃, cooled to 55 ℃ and tested for the performance of the aged drilling fluid. The performance of the ultrahigh-temperature high-density drilling fluid with the component ratio is as follows in the following table 1:
TABLE 1
According to the formula experiment result, the density is 2.40g/cm3After the drilling fluid system is aged for 16h and 65h at the high temperature of 220 ℃, the HTHP fluid loss is 11mL and 11.8mL, the aging time is increased from 16h to 65h, the viscosity and the shear force are increased and still in a controllable range, and the rheological property is good and the fluid loss is easy to control. After standing and aging at 220 ℃ for 137h, the rheological property and the filtration loss are still well controlled, and the sedimentation factor SF value is 0.525, which shows that the sedimentation stability of the ultrahigh-temperature high-density drilling fluid system is good.
Example 2
The density is 2.20g/cm3The ultrahigh-temperature high-density drilling fluid comprises the following components in parts by weight based on 100 parts by weight of water:
preparing sodium bentonite slurry according to the component ratio, aging for 24 hours, adding the ultrahigh-temperature filtrate reducer SMPFL-UP under high stirring, adding the dispersant SMS-H, the sulfonated lignite, the lignite resin, the lubricant SMJH-1, the anti-collapse agent SMNA-1 and the sodium hydroxide after uniform dissolution, stirring until uniform dissolution, adding the barite powder under stirring, and testing the performance of the drilling fluid before aging after high stirring for 20 minutes. The ultrahigh-temperature high-density drilling fluid prepared by the method is put into a high-temperature aging tank, rolled at 240 ℃, and cooled to 55 ℃ to test the performance of the aged drilling fluid. The performance of the ultrahigh-temperature high-density drilling fluid with the component ratio is as follows 2:
TABLE 2
As is clear from the results of the experiment, the density was 2.20g/cm3The drilling fluid system has good rheological property after rolling aging for 16h and 65h at the high temperature of 240 ℃, and the HTHP water loss is controlled within 8 mL. After the drilling fluid is kept stand and aged for 137 hours at the temperature of 240 ℃, the rheological property and the filtration loss are still well controlled, and the sedimentation factor SF value is 0.535, which shows that the sedimentation stability of the ultrahigh-temperature high-density drilling fluid system is good.
Example 3
The density was 2.40g/cm3The ultrahigh-temperature high-density drilling fluid comprises the following components in parts by weight based on 100 parts by weight of water:
preparing sodium bentonite slurry according to the component ratio, aging for 24 hours, adding the ultrahigh-temperature filtrate reducer SMPFL-UP under high stirring, adding the dispersant SMS-H, the sulfonated lignite, the lignite resin, the lubricant SMJH-1, the anti-collapse agent SMNA-1 and the sodium hydroxide after uniform dissolution, stirring until uniform dissolution, adding the barite powder under stirring, and testing the performance of the drilling fluid before aging after high stirring for 20 minutes. The ultrahigh-temperature high-density drilling fluid prepared by the method is put into a high-temperature aging tank, rolled at 240 ℃, and cooled to 55 ℃ to test the performance of the aged drilling fluid. The performance of the ultrahigh-temperature high-density drilling fluid with the component ratio is as follows in the following table 3:
as is clear from the experimental results, the density was 2.40g/cm3The drilling fluid system has good rheological property after 16-hour rolling aging at the high temperature of 240 ℃, and the HTHP water loss is controlled at 15mL, which shows that the ultrahigh-temperature high-density drilling fluid system has better rheological property and lower high-temperature high-pressure fluid loss.
Example 4: the difference from example 3 is only that the high temperature resistant dispersant SMS-H is 0.5 parts, and the properties are shown in Table 3.
Example 5: the difference from example 3 is only that the high temperature resistant dispersant SMS-H is 3 parts, and the properties are shown in Table 3.
Example 6: the difference from example 3 is only that the high temperature resistant dispersant SMS-H is 5 parts, and the properties are shown in Table 3.
Example 7: the difference from the example 3 is only that the superhigh temperature fluid loss additive SMPFL-UP is 0.3 part, and the properties are shown in the table 3.
Example 8: the difference from the example 3 is only that the superhigh temperature fluid loss additive SMPFL-UP is 1.2 parts, and the properties are shown in the table 3.
Example 9: the difference from the example 3 is only that the superhigh temperature fluid loss additive SMPFL-UP is 3 parts, and the properties are shown in the table 3.
Example 10:
the difference from example 3 is only that the high temperature resistant dispersant is modified sulfonated tannin, and the properties are shown in Table 3. As is clear from the experimental results, the density was 2.40g/cm3The drilling fluid system has high plastic viscosity and shear force and extremely poor rheological property after 16-hour rolling aging at the high temperature of 240 ℃, the HTHP water loss control can be controlled to be 20mL, the drilling fluid system is kept stand and aged for 137 hours after being subjected to the rolling aging at the temperature of 240 ℃, the sedimentation stability coefficient SF value is 0.622, and the sedimentation stability is poor.
TABLE 3
It should be noted that the above-mentioned embodiments are only for explaining the present invention, and do not set any limit to the present invention. The present invention has been described with reference to exemplary embodiments, but the words which have been used herein are words of description and illustration, rather than words of limitation. The invention can be modified, as prescribed, within the scope of the claims and without departing from the scope and spirit of the invention. Although the invention has been described herein with reference to particular means, materials and embodiments, the invention is not intended to be limited to the particulars disclosed herein, but rather extends to all other methods and applications having the same functionality.
Claims (10)
1. The ultrahigh-temperature high-density drilling fluid comprises 100 parts by weight of water, 0.2-10 parts by weight of high-temperature resistant dispersing agent, 0.1-10 parts by weight of ultrahigh-temperature fluid loss additive, 0.5-10 parts by weight of lubricant, 0.2-10 parts by weight of anti-collapse agent, 0-10 parts by weight of sulfonated lignite, 0-10 parts by weight of lignite resin, 0.1-5 parts by weight of pH value regulator, 0.2-5 parts by weight of bentonite and 500 parts by weight of weighting agent.
2. The drilling fluid according to claim 1, wherein the amount of the water is 100 parts by weight,
0.5-5 parts of high-temperature resistant dispersing agent, preferably 1-3 parts;
the ultrahigh-temperature fluid loss additive is 0.2-6 parts, preferably 0.5-3 parts;
1-5 parts of lubricant, preferably 2-4 parts;
0.5-6 parts of anti-collapse agent, preferably 2-4 parts;
1-6 parts of sulfonated lignite;
1-6 parts of lignite resin;
0.2-3 parts of pH value regulator;
0.5-3 parts of bentonite.
3. The drilling fluid according to claim 1 or 2, wherein the high temperature dispersant comprises the reaction product of an organic anhydride, a vinyl-containing sulfonate and a sulfonated phenolic resin, preferably the high temperature dispersant SMS-H.
4. The drilling fluid according to any one of claims 1 to 3, wherein the ultra-high temperature fluid loss additive comprises one or more sulfonated phenolic resin graft modified polymers, preferably an ultra-high temperature fluid loss additive SMPFL-UP.
5. The drilling fluid according to any one of claims 1 to 4, wherein the lubricant comprises one or more selected from the group consisting of extreme pressure lubricants, crude oil and graphite, preferably lubricant SMJH-1.
6. The drilling fluid as claimed in any one of claims 1 to 5, wherein the anti-collapse agent comprises one or more selected from a resin type anti-collapse agent and an asphalt type anti-collapse agent, preferably an anti-collapse agent SMNA-1.
7. The drilling fluid of any one of claims 1 to 6, wherein the bentonite comprises one or more selected from the group consisting of calcium bentonite, magnesium bentonite and sodium bentonite.
8. The drilling fluid according to any one of claims 1 to 7, wherein the pH regulator comprises one or more selected from the group consisting of sodium hydroxide, potassium hydroxide and sodium carbonate;
and/or the weighting agent comprises one or more selected from calcium carbonate, barite, iron ore powder and galena powder.
9. A method of preparing a drilling fluid according to any one of claims 1 to 8, comprising the steps of:
(1) adding bentonite into water to obtain bentonite slurry, and preferably maintaining for 12-36 hr;
(2) adding an ultra-high temperature fluid loss additive into the bentonite slurry obtained in the step (1) to obtain mixed slurry A;
(3) adding a high-temperature resistant dispersing agent, sulfonated lignite, lignite resin, a lubricant, an anti-collapse agent and a pH value regulator into the mixed slurry A obtained in the step (2) to obtain mixed slurry B;
(4) and (4) adding a weighting agent into the mixed slurry B obtained in the step (3) to obtain the drilling fluid.
10. Use of the drilling fluid according to any one of claims 1-8 or the drilling fluid prepared according to the method of claim 9 in drilling, completion and workover operations, in particular in ultrahigh temperature and high pressure formations.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130079256A1 (en) * | 2011-09-28 | 2013-03-28 | Sinopec Research Institute Of Petroleum Engineering | Filtration Control Agent And A Drilling Fluid Containing The Same |
| CN103160259A (en) * | 2013-04-03 | 2013-06-19 | 中国石油大学(华东) | 255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof |
-
2019
- 2019-10-09 CN CN201910955138.XA patent/CN112625662A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130079256A1 (en) * | 2011-09-28 | 2013-03-28 | Sinopec Research Institute Of Petroleum Engineering | Filtration Control Agent And A Drilling Fluid Containing The Same |
| CN103160259A (en) * | 2013-04-03 | 2013-06-19 | 中国石油大学(华东) | 255 DEG C superhigh temperature resistant water-based drilling fluid and construction process thereof |
Non-Patent Citations (3)
| Title |
|---|
| 王中华: "超高温钻井液降滤失剂P(AMPS-AM-AA)/SMP的研制", 《石油钻探技术》 * |
| 道客巴巴: ""Q-SH 3580 0074-2017超高温高密度钻井液用分散剂SMS-H最新", 《道客巴巴》 * |
| 金军斌等: "高温老化对黏土/降滤失剂体系滤失作用研究", 《科学技术与工程》 * |
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