CN108048053B - Water-based drilling fluid and preparation method thereof - Google Patents
Water-based drilling fluid and preparation method thereof Download PDFInfo
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- CN108048053B CN108048053B CN201711268739.0A CN201711268739A CN108048053B CN 108048053 B CN108048053 B CN 108048053B CN 201711268739 A CN201711268739 A CN 201711268739A CN 108048053 B CN108048053 B CN 108048053B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
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- C—CHEMISTRY; METALLURGY
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/34—Lubricant additives
Abstract
The invention provides a water-based drilling fluid and a preparation method thereof. The water-based drilling fluid comprises water and also comprises the following components in percentage by weight, based on the weight of the water as 100 percent: 2.0-4.0% of bentonite, 0.5-1.0% of other polymer fluid loss additives except low-viscosity polyanionic cellulose, 0.2-0.5% of low-viscosity polyanionic cellulose, 3.0-8.0% of salt inhibitor, 1.0-5.0% of plugging lubricant, 0.2-0.6% of coating agent and proper amount of weighting agent. The simple water-based drilling fluid does not contain any treating agent with environmental protection pressure, and has the advantages of simple formula, stable drilling fluid performance and high cost performance.
Description
Technical Field
The invention relates to the field of drilling exploitation, in particular to a water-based drilling fluid and a preparation method thereof.
Background
At present, the formula of the water-based drilling fluid used in domestic drilling sites is generally complex, a plurality of treating agents are added, the field maintenance of the drilling fluid is always considered, the environmental protection requirement is increasingly strict, and the cost of the drilling fluid is difficult to control.
Aiming at the performances of rheological property, lubricity, inhibitive property, blocking property and the like of a water-based drilling fluid system, the water-based drilling fluid combines the drilling requirements of the field, aims at environmental protection, avoids using a treating agent product which can bring environmental protection pressure, and develops the water-based drilling fluid technology towards the direction of simple formula, high cost performance, safety and environmental protection.
Disclosure of Invention
It is an object of the present invention to provide a water-based drilling fluid. The invention aims to prepare a simple water-based drilling fluid by optimizing the combination of environment-friendly treating agents such as a filtrate reducer, a coating agent, a plugging lubricant and the like based on the concepts of simple formula and environment protection.
The invention also aims to provide a preparation method of the water-based drilling fluid.
In order to achieve the above purpose, in one aspect, the present invention provides a water-based drilling fluid, wherein a preparation raw material of the water-based drilling fluid comprises water, and the preparation raw material further comprises the following components, by weight, based on 100% of the weight of the water: 2.0-4.0% of bentonite, 0.5-1.0% of other polymer fluid loss additives except low-viscosity polyanionic cellulose, 0.2-0.5% of low-viscosity polyanionic cellulose, 3.0-8.0% of salt inhibitor, 1.0-5.0% of plugging lubricant, 0.2-0.6% of coating agent and proper amount of weighting agent.
According to some specific embodiments of the present invention, the preparation raw materials of the water-based drilling fluid comprise the following components by weight percent, based on the weight of water as 100%: 2.0 percent of bentonite, 0.8 percent of other polymer fluid loss additive except low-viscosity polyanionic cellulose, 0.3 percent of low-viscosity polyanionic cellulose, 3.0 to 5.0 percent of salt inhibitor, 2.0 to 3.0 percent of plugging lubricant, 0.3 to 0.5 percent of coating agent and proper amount of weighting agent.
It will be understood that the amounts of weighting agent described herein are those amounts which will be readily selected by those skilled in the art based on the actual requirements, and such selection is well known to those skilled in the art based on the field situation. The amount of weighting agent is generally selected based on the density of the water-based drilling fluid desired by the design.
According to some embodiments of the present invention, the raw material for preparing the water-based drilling fluid further comprises a pH adjusting agent for adjusting the pH of the water-based drilling fluid to 8 to 10.
According to some embodiments of the present invention, the raw material for preparing the water-based drilling fluid further comprises a pH adjusting agent for adjusting the pH of the water-based drilling fluid to 9 to 10.
According to some embodiments of the invention, the pH adjusting agent is an alkaline compound.
According to some embodiments of the invention, the pH adjusting agent is sodium carbonate, sodium hydroxide or potassium hydroxide.
According to some embodiments of the invention, the polymeric fluid loss additive other than the low viscosity polyanionic cellulose is a polyacrylamide fluid loss additive.
According to some embodiments of the invention, the polymeric fluid loss additive comprises at least DR-1, and optionally, the fluid loss additive further comprises SP-8 and/or PMHA-2 and/or DSP-2.
According to some embodiments of the invention, the low viscosity polyanionic cellulose is a low viscosity polyanionic cellulose (PAC _ LV) conventionally marketed in the art.
According to some embodiments of the present invention, the low viscosity polyanionic cellulose is a low viscosity polyanionic cellulose having a purity of not less than 90% and a substitution degree (average number of hydroxyl groups substituted with a carboxymethyl group for a hydrogen atom per glucose unit) of not less than 0.9.
According to some embodiments of the invention, the coating agent is a cationic polyacrylamide or a zwitterionic polymer.
According to some embodiments of the invention, the cationic polyacrylamide is a cationic polyacrylamide having a molecular weight of 90 to 200 ten thousand.
According to some embodiments of the present invention, the cationic polyacrylamide is 100-200 ten thousand molecular weight cationic polyacrylamide.
According to some of these specific embodiments of the invention, wherein the cationic polyacrylamide is EMP.
According to some embodiments of the invention, wherein the zwitterionic polymer is a FA series zwitterionic polymer.
According to some embodiments of the invention, wherein the zwitterionic polymer is FA367 or EMP.
According to some embodiments of the invention, the bentonite is sodium bentonite.
According to some embodiments of the invention, the salt inhibitor is a mixture of one or more of potassium salt, magnesium salt, or sodium salt.
According to some embodiments of the invention, the potassium salt is potassium chloride or potassium formate.
According to some embodiments of the invention, the magnesium salt is magnesium chloride.
According to some embodiments of the invention, the sodium salt is sodium chloride.
According to some embodiments of the invention, the salt inhibitor is potassium chloride and/or potassium formate.
According to some embodiments of the present invention, the blocked lubricant is prepared by uniformly mixing at least an extreme pressure antiwear agent, a vegetable oil and a surfactant.
According to some embodiments of the invention, the extreme pressure anti-wear agent is a sulfur-type extreme pressure anti-wear agent, a phosphorus-type extreme pressure anti-wear agent, or a chlorine-type extreme pressure anti-wear agent.
Common sulfur type extreme pressure antiwear agents are sulfurized olefins and sulfurized fatty acid esters; common phosphate esters (such as tricresyl phosphate, trixylenyl phosphate and the like), phosphite esters, dialkyl alkyl phosphonate esters and the like of phosphorus-type extreme pressure antiwear agents; the chlorine-containing extreme pressure antiwear agent is commonly selected from chlorinated fatty acid, chlorinated aromatic hydrocarbon, chlorinated alkyl sulfide and the like.
For example, the chlorinated aromatic hydrocarbon may be a chlorinated aromatic hydrocarbon in which hydrogen on the benzene ring is substituted with an alkyl group having 1 to 10 carbon atoms and chlorine, wherein the total number of the alkyl group and the chlorine is 2 to 6; specific examples thereof include chlorobenzene, dichlorobenzene (p-dichlorobenzene, o-dichlorobenzene, m-dichlorobenzene), methylchlorobenzene (m-chlorotoluene, p-chlorotoluene, m-chlorotoluene, 2,4, 6-trimethylchlorobenzene), ethylchlorobenzene, and the like.
The alkyl group of the chloroalkyl sulfide may be an alkyl group having 1 to 10 carbon atoms, such as a methyl group, an ethyl group, and a propyl group.
According to some embodiments of the invention, the vegetable oil is a mixture of one or more of cottonseed oil, rapeseed oil and castor oil.
According to some embodiments of the invention, the surfactant is sorbitan monooleate, sorbitan monopalmitate and sorbitan monolaurate.
According to some embodiments of the invention, the occlusive lubricant is MPA.
According to some embodiments of the invention, the weighting agent is a mixture of one or more of barite, hematite, and iron oxides.
According to some specific embodiments of the present invention, the water-based drilling fluid is prepared from the following raw materials, wherein the raw materials comprise, by weight of water and 100%: 1.0-3.0% of an amine-based inhibitor.
According to some embodiments of the invention, the amine-based inhibitor is SIAT.
The inhibition performance of the compact water-based drilling fluid can be enhanced by adding the amino inhibitor SIAT.
The above components of the present invention are commercially available.
On the other hand, the invention also provides a preparation method of the water-based drilling fluid, wherein the method comprises the steps of uniformly mixing bentonite and water, adding a filtrate reducer and low-viscosity polyanionic cellulose into the mixed solution of the bentonite and the water, and then sequentially adding a salt inhibitor, a coating agent, a blocking lubricant and a weighting agent; optionally, when the water-based drilling fluid further comprises a zwitterionic polymer, the zwitterionic polymer is added after the salt inhibitor is added and before the plugging lubricant is added.
According to some embodiments of the present invention, the fluid loss additive and the low-viscosity polyanionic cellulose are prepared into aqueous solutions, and then added into the mixed solution of bentonite and water.
According to some embodiments of the invention, when the aqueous based drilling fluid contains an amine based inhibitor, the amine based inhibitor is added before the weighting agent is added.
For example, the amine-based inhibitor is added after the addition of the plugging lubricant and before the addition of the weighting agent.
In conclusion, the invention provides a water-based drilling fluid and a preparation method thereof. The drilling fluid has the following advantages:
the simple water-based drilling fluid is prepared by optimizing the combination of environment-friendly treating agents such as a filtrate reducer, an inhibitor, a coating agent, a plugging lubricant and the like. The simple water-based drilling fluid does not contain any treating agent with environmental protection pressure, and has the advantages of simple formula, stable drilling fluid performance and high cost performance; a novel plugging lubricant MPA is introduced into the water-based drilling fluid, and the MPA has excellent lubricating property, can obviously improve the quality of mud cakes and has good plugging effect.
The compact drilling fluid system has wide application range and can be applied to drilling of complex strata with strict environmental protection requirements.
Drawings
FIG. 1 is the apparent morphology of the mudcake formed by loss of water under pressure in the two formulations of example 4.
Detailed Description
The following detailed description is provided for the purpose of illustrating the embodiments and the advantageous effects thereof, and is not intended to limit the scope of the present disclosure.
Experimental materials: potassium chloride, analytically pure, Shantou Wen Longjing chemical plant; fluid loss additive SP-8, fluid loss additive PMHA-2, coating agent FA367, Xinjiang oil field company; emulsion macromolecule EMP, low viscosity polyanionic cellulose PAC-LV, Shandong Shunyuan Petroleum science and technology Limited; salt-resistant filtrate reducer DR-1, amino inhibitor SIAT, plugging lubricant MPA, China Petroleum group drilling engineering research institute; bentonite, grass street soil.
Example 1:
the performance of the drilling fluid with SP-8, PMHA-2, DR-1 and PAC-LV as the filtrate loss reducer alone and the performance of the drilling fluid with DR-1 matched with PAC _ LV and SP-8 matched with PAC _ LV as the filtrate loss reducer are examined, 65g of barite powder is added into each formula, and the density of the drilling fluid is 1.12g cm-3. The results of the performance tests of the drilling fluid systems with different formulations are shown in table 1.
TABLE 1 Performance testing of drilling fluid systems of different formulations
Formulation 1 #: 2% of bentonite, 0.4% of NaOH, 0.8% of filtrate reducer SP-8, 3% of KCl and 0.3% of coating agent FA367, 2% of lubricant MPA and barite
Formulation 2 #: 2% of bentonite, 0.4% of NaOH, 0.5% of fluid loss additive PMHA-2, 3% of KCl and 0.3% of coating agent FA367, 1% of MPA and barite
Formulation No. 3: 2% of bentonite, 0.4% of NaOH, 0.8% of filtrate reducer DR-1+ 3% of KCl, 0.3% of emulsion macromolecule EMP, 2% of MPA and barite
Formulation 4 #: 2% of bentonite, 0.4% of NaOH, 0.8% of low-viscosity polyanionic cellulose PAC-LV, 3% of KCl and 0.3% of coating agent FA367, 2% of MPA and barite
Formulation No. 5: 2% of bentonite, 0.4% of NaOH, 0.8% of fluid loss additive SP-8, 0.3% of low-viscosity polyanionic cellulose PAC-LV, 3% of KCl and 0.3% of coating agent FA367, 2% of MPA and barite
Formulation No. 6: 2% of bentonite, 0.4% of NaOH, 0.8% of fluid loss additive DR-1, 0.3% of low-viscosity polyanionic cellulose PAC-LV, 3% of KCl, 0.3% of emulsion macromolecule EMP, 2% of MPA and barite
When the filtrate reducer is singly used as DR-1, SP-8 or PMHA-2, the filtrate reduction of a drilling fluid system cannot be effectively controlled, and when the PAC _ LV is singly used as the filtrate reducer, the drilling fluid system has better filtrate reduction performance, but formed mud cakes are thick and heavy, and the initial/final cut of the system is smaller; the filtrate reducer DR-1 is used in combination with PAC _ LV, and the basic formula is 2% of bentonite, 0.4% of NaOH, 0.8% of DR-1, 0.3% of PAC-LV, 3% of KCL, 0.3% of coating agent and 2% of MPA (weighted according to actual needs), so that the 6# compact water-based drilling fluid has the comprehensive properties of proper rheological property, good filtrate reduction property and the like, and the formed API mud cake is thin and light, and the surface of the mud cake is fine and smooth and has toughness.
Example 2:
the salt added in the compact water-based drilling fluid is potassium formate, and an amino inhibitor SIAT (system inhibition performance is enhanced). In the experiment, for performance comparison, the filtrate reducer DR-1 in the compact water-based drilling fluid formula 7# is replaced by PMHA-2, other components are unchanged, and the drilling fluid density is 1.12g cm-3. The performance results are shown in Table 2.
TABLE 2 Performance testing of drilling fluid systems of different formulations
Formulation No. 7: 2% bentonite, 0.4% NaOH, 0.8% DR-1+ 0.3% PAC-LV + 3% HCOOK + 0.3% EMP + 2% MPA + 1% SIAT + barite
Formulation No. 8: 2% bentonite, 0.4% NaOH, 0.5% PMHA-2, 0.3% PAC-LV, 3% HCOOK, 0.3% EMP, 2% MPA, 1% SIAT + barite
The formulations of the compact water-based drilling fluids in examples 2 and 1 were slightly adjusted for the salt and amine-based inhibitor SIAT, but had little effect on the performance of the drilling fluids and good reproducibility of the tested performance parameters. And after the filtrate reducer PMHA-2 replaces DR-1 and is matched with PAC _ LV to form a drilling fluid system, the filtrate reduction performance of the drilling fluid system is obviously inferior to that of a compact water-based drilling fluid, the HTHP filtrate loss at 100 ℃ reaches 32.8mL, and the weight of a mud cake formed by medium-pressure water loss after air drying reaches 5.52g, which is obviously greater than that of a mud cake formed by a compact water-based drilling fluid (formula 7#) (2.68 g).
Example 3:
according to a compact water-based drilling fluid system, 2% of bentonite, 0.4% of NaOH, 0.8% of DR-1, 0.3% of PAC-LV, 3% of KCl, 0.3% of FA367, 2% of MPA and barite (formula 9#), when the water-based drilling fluid is prepared, the amount of clear water is 400mL, all treating agents are sequentially added according to respective weight percentage (based on water), and finally 156g of barite powder is added, wherein the drilling fluid density is 1.28 g-cm-3. The performance of the compact water-based drilling fluid is tested in table 3.
TABLE 3 Performance testing of compact Water-based drilling fluid systems
Example 4: for the compact water-based drilling fluid (formulation # 7) of example 2, the performance of the formulation without MPA (same as the other additives) was compared, and the results of the performance test for the two formulations are shown in table 4.
TABLE 4 Performance testing of drilling fluid systems of different formulations
Formulation No. 7: 2% bentonite, 0.4% NaOH, 0.8% DR-1+ 0.3% PAC-LV + 3% HCOOK + 0.3% EMP + 2% MPA + 1% SIAT + barite
Formulation No. 10: 2% bentonite, 0.4% NaOH, 0.8% DR-1+ 0.3% PAC-LV + 3% HCOOK + 0.3% EMP + 1% SIAT + barite
Compared with the simple water-based drilling fluid, the drilling fluid without MPA (formula No. 10) has obviously poorer filtrate loss reduction performance, and the mud cake formed by water loss under pressure has more tiny cracks on the surface after being air-dried. And because the plugging lubricant MPA is added into the simple water-based drilling fluid, the MPA can be dispersed into nano-micron emulsion in the water-based drilling fluid to effectively plug nano/micron pores of the mud cakes, the quality of the mud cakes is improved (the mud cakes prepared by the formula 7# and the formula 10# are shown in figure 1), and the formed mud cakes are more compact and fine, so that the filtration loss of the system can be obviously reduced by adding the MPA into the system.
The extreme pressure lubrication coefficient of the compact water-based drilling fluid (formula 7#) measured by a lubrication performance experiment is 0.0766, the extreme pressure lubrication coefficient of the formula 10# without MPA is 0.1465, and the lubrication coefficient of the formula 7# with 2% MPA is reduced by 47.7% compared with that of the formula 10#, so that the result shows that the MPA has strong lubricity, the lubrication effect of an optimized water-based drilling fluid system can be obviously enhanced, and the good lubricating and drag reducing effects are achieved.
The experimental procedures for operating the present invention can be performed by laboratory personnel and are not described in detail.
Claims (15)
1. The water-based drilling fluid comprises the following preparation raw materials in percentage by weight, wherein the preparation raw materials comprise water, and the preparation raw materials comprise the following components in percentage by weight, based on the weight of the water as 100 percent: 2.0-4.0% of bentonite, 0.5-1.0% of other polymer fluid loss additives except low-viscosity polyanionic cellulose, 0.2-0.5% of low-viscosity polyanionic cellulose, 3.0-8.0% of salt inhibitor, 1.0-5.0% of plugging lubricant, 0.2-0.6% of coating agent and proper amount of weighting agent;
the polymer fluid loss additive except the low-viscosity polyanionic cellulose is polyacrylamide fluid loss additive, the polyacrylamide fluid loss additive at least comprises DR-1, and optionally, the polyacrylamide fluid loss additive also comprises SP-8 and/or PMHA-2;
the low viscosity polyanionic cellulose is PAC _ LV;
the coating agent is cationic polyacrylamide or FA series zwitterionic polymer with the molecular weight of 90-200 ten thousand;
the salt inhibitor is one or more of potassium salt, magnesium salt or sodium salt;
the plugging lubricant is MPA;
the weighting agent is one or a mixture of barite, hematite and iron oxide;
the preparation method of the water-based drilling fluid comprises the steps of fully hydrating bentonite in water to form bentonite-based slurry, fully dissolving polymer fluid loss additives except low-viscosity polyanionic cellulose and the low-viscosity polyanionic cellulose in the water respectively to form glue solutions, fully mixing the glue solutions with the bentonite-based slurry, and then sequentially adding a salt inhibitor, a coating agent, a plugging lubricant and a weighting agent.
2. The water-based drilling fluid of claim 1, wherein the preparation raw materials of the water-based drilling fluid comprise the following components in percentage by weight based on 100 percent of water: 2.0 percent of bentonite, 0.8 percent of other polymer fluid loss additive except low-viscosity polyanionic cellulose, 0.3 percent of low-viscosity polyanionic cellulose, 3.0 to 5.0 percent of salt inhibitor, 2.0 to 3.0 percent of plugging lubricant, 0.3 to 0.5 percent of coating agent and proper amount of weighting agent.
3. The water-based drilling fluid of claim 1, wherein the raw materials for preparing the water-based drilling fluid further comprise a pH regulator for regulating the pH value of the water-based drilling fluid to 8-10.
4. The water-based drilling fluid of claim 3, wherein the raw materials for preparing the water-based drilling fluid further comprise a pH regulator for regulating the pH value of the water-based drilling fluid to 9-10.
5. The water-based drilling fluid of claim 3, wherein the pH modifier is a basic compound.
6. The water-based drilling fluid of claim 3, wherein the pH modifier is sodium carbonate, sodium hydroxide, or potassium hydroxide.
7. The water-based drilling fluid of claim 1, wherein the coating agent is a cationic polyacrylamide having a molecular weight of 100 and 200 ten thousand.
8. The water-based drilling fluid of claim 1, wherein the coating agent is a cationic polyacrylamide emulsion EMP.
9. The water-based drilling fluid of claim 1, wherein the FA series zwitterionic polymer is FA367 or EMP.
10. The water-based drilling fluid of claim 1, wherein the bentonite is sodium bentonite.
11. The water-based drilling fluid of claim 1, wherein the potassium salt is potassium chloride or potassium formate; the magnesium salt is magnesium chloride; the sodium salt is sodium chloride.
12. The water-based drilling fluid of claim 1, wherein the raw materials for preparing the water-based drilling fluid further comprise the following components in percentage by weight, based on the weight of water as 100%: 1.0-3.0% of an amine-based inhibitor.
13. The water-based drilling fluid of claim 12, wherein the amine-based inhibitor is SIAT.
14. The preparation method of the water-based drilling fluid as claimed in any one of claims 1 to 13, wherein the method comprises the steps of fully hydrating bentonite in water to form bentonite-based slurry, fully dissolving polymer fluid loss additives except the low-viscosity polyanionic cellulose and the low-viscosity polyanionic cellulose in water to form glue solutions, fully mixing the glue solutions with the bentonite-based slurry, and then sequentially adding the salt inhibitor, the coating agent, the plugging lubricant and the weighting agent.
15. The method of claim 14 wherein, when the aqueous based drilling fluid contains an amine based inhibitor, the amine based inhibitor is added prior to the addition of weighting agent.
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| CN109504354B (en) * | 2019-01-14 | 2021-03-09 | 中海石油(中国)有限公司上海分公司 | Lubricant, drilling fluid and application thereof |
| CN109825267A (en) * | 2019-04-01 | 2019-05-31 | 安徽陆海石油助剂科技有限公司 | A kind of drilling fluid anti-collapse and anti-falling filtration agent and its production method |
| CN110951468A (en) * | 2019-10-24 | 2020-04-03 | 上海江南长兴造船有限责任公司 | Ocean high-temperature high-pressure water-based drilling fluid |
| CN110846002B (en) * | 2019-11-13 | 2022-04-08 | 中国海洋石油集团有限公司 | Water-based drilling fluid and preparation method thereof |
| CN111087985A (en) * | 2019-11-26 | 2020-05-01 | 中国石油集团川庆钻探工程有限公司 | Water-based drilling fluid |
| CN113897187B (en) * | 2021-11-27 | 2022-04-22 | 石家庄华莱鼎盛科技有限公司 | Polymer clean drilling fluid system |
| CN114539994B (en) * | 2022-04-24 | 2022-07-15 | 山东维斯特尔石油科技有限公司 | Reservoir drilling fluid system and preparation method thereof |
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