CN111534289A - Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof - Google Patents
Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof Download PDFInfo
- Publication number
- CN111534289A CN111534289A CN202010464007.4A CN202010464007A CN111534289A CN 111534289 A CN111534289 A CN 111534289A CN 202010464007 A CN202010464007 A CN 202010464007A CN 111534289 A CN111534289 A CN 111534289A
- Authority
- CN
- China
- Prior art keywords
- parts
- resistant
- temperature
- salt
- lignite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- C09K8/03—Specific additives for general use in well-drilling compositions
Abstract
The invention provides a temperature-resistant, salt-resistant, anti-collapse and fluid loss-reduction composite mud treatment agent and a preparation method thereof, wherein the composite mud treatment agent is prepared from the following materials in parts by weight: 60-70 parts of lignite, 10-15 parts of sodium hydroxide, 6-8 parts of modifier, 0.9-1.2 parts of ammonium persulfate, 2-4 parts of hydrolyzed polyacrylonitrile sodium salt, 8-10 parts of modified asphalt powder and 300 parts of water. The invention realizes the synergistic cooperation of a plurality of functional groups by multi-element grafting on the lignite, achieves the effects of reducing filtration, resisting salt, resisting temperature and preventing collapse, can effectively change the rheological property of the drilling fluid, keeps lower shear force at higher viscosity, improves the drilling speed by 20-30 percent and can greatly improve the drilling efficiency.
Description
Technical Field
The invention relates to the technical field of oil and gas drilling, in particular to a temperature-resistant, salt-resistant, anti-collapse and fluid loss-resistant composite mud treatment agent and a preparation method thereof.
Background
In recent years, with the development of oil and gas drilling towards deep underground, the conditions of drilling the stratum are increasingly complex, with the increase of the well depth, the difficulty of the drilling technology is gradually increased, the requirements on the performance of the drilling fluid are higher and higher, the traditional drilling fluid has poor material performance, large addition, poor effect and high cost, and the requirements on oil and gas drilling are increasingly difficult to meet. Most of composite slurry treating agents have the problems of insufficient temperature resistance, salt resistance and shear resistance, which are serious particularly at high temperature and high pressure. Under high temperature conditions, the components of the drilling fluid may be thickened, degraded and the like, so that the performance of the drilling fluid is changed, and along with high pressure, the maintenance of good rheological property and low high-temperature and high-pressure filtration loss of the drilling fluid is difficult.
Lignite is a type of coal, which contains 20-80% humic acid. The humic acid contains various functional groups, wherein carboxyl, methoxy, alcoholic hydroxyl, phenolic hydroxyl, carbonyl and the like are mainly contained, and due to the existence of the functional groups, the humic acid shows better fluid loss and viscosity reduction performances. However, the lignite mud treating agent has the problems of high-temperature thermal oxidative degradation, thickening after being polluted by salt, reduction of the fluid loss effect and the like, meanwhile, the pH value of the humic acid treating agent is high, the dispersion effect on clay is stronger along with the continuous accumulation of the using amount, and the viscosity of the drilling fluid is easily increased, the shearing force is increased, the drill bit speed is reduced and the like due to the excessively strong dispersion.
Disclosure of Invention
The invention provides a temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent and a preparation method thereof, wherein multiple grafting is carried out on lignite, so that the synergistic cooperation of multiple functional groups is realized, the effects of reducing fluid loss, resisting salt, resisting temperature and preventing collapse are achieved, the rheological property of a drilling fluid can be effectively changed, a lower shear force is kept at a higher viscosity, the drilling speed is improved by 20-30%, and the drilling efficiency can be greatly improved.
The technical scheme of the invention is realized as follows: the temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent is prepared from the following materials in parts by weight: 60-70 parts of lignite, 10-15 parts of sodium hydroxide, 6-8 parts of modifier, 0.9-1.2 parts of ammonium persulfate, 2-4 parts of hydrolyzed polyacrylonitrile sodium salt, 8-10 parts of modified asphalt powder and 300 parts of water.
Further, the modifier comprises acrylic acid, acrylamide and sodium acrylate sulfonate, wherein the mass ratio of the acrylic acid to the acrylamide to the sodium acrylate sulfonate is 1.5-3: 2: 3-4.
Further, the modified asphalt powder is sulfonated asphalt or oxidized asphalt.
A preparation method of the temperature-resistant, salt-resistant, anti-collapse and fluid loss composite mud treatment agent comprises the following steps:
(1) lignite pretreatment: dissolving sodium hydroxide into water to obtain a sodium hydroxide solution, dissolving lignite into the sodium hydroxide solution, then performing microwave heating at the power of 350-400W for 3-5min, performing water bath treatment at the temperature of 90-100 ℃ for 20-40min, and removing insoluble substances by a suction filtration method to obtain a coal alkali solution;
(2) adding a modifier into the coal alkali liquor obtained in the step (1), keeping the temperature at 50-65 ℃, then adding ammonium persulfate, and stirring at constant temperature for reacting for 1-3h to obtain a modified lignite solution;
(3) putting the hydrolyzed polyacrylonitrile sodium salt and the modified lignite solution obtained in the step (2) into a kneader, setting the temperature to be 80-100 ℃, and carrying out closed kneading reaction for 1-1.5 h;
(4) adding the modified asphalt powder into the solution obtained after the kneading reaction in the step (3), stirring at the constant temperature of 80-100 ℃ for 0.5-1h, and finally drying and crushing.
The invention has the beneficial effects that:
the composite slurry treating agent disclosed by the invention is subjected to multi-element grafting on lignite, so that the synergistic cooperation of multiple functional groups such as humic acid, nitrile group, hydroxyl group, amide group, sulfonic group and carboxyl group is realized, a good effect on reducing the filtration loss is achieved, groups such as a temperature-resistant group sulfonic group, an amide group and a salt-resistant group sulfonic group are introduced, a good salt-resistant and temperature-resistant effect is achieved, and a polyacrylonitrile sodium salt is further grafted and matched with modified asphalt, so that the control of the filtration loss under high temperature and high pressure is facilitated, and the anti-collapse effect is achieved. When the preparation method of the invention is used for pretreating the lignite, the microwave treatment is firstly carried out for 3-5min, and then the constant temperature water bath is carried out, thus being beneficial to improving the pretreatment efficiency of the lignite, saving the time, improving the activity of functional groups in the lignite and improving the efficiency of subsequent multi-grafting.
The composite mud treatment agent has the following advantages:
1. high environmental protection advantage: by adopting multi-element grafting and the cooperative matching of different groups, the dosage of the sulfonated substance can be greatly reduced, so that the pollution of underground water is greatly reduced, and according to different well depths and stratum characteristics, the dosage of the single-well sulfonated material can be reduced by 8-10t compared with the dosage of the traditional old drilling fluid;
2. high safety advantage: the filtration loss is kept at a very low level (less than or equal to 5ml), and compared with the traditional drilling fluid material, a thin and tough filter cake can be formed on the well wall more quickly, so that the well wall is kept stable, and the drilling accidents can be effectively prevented;
3. the advantage of high drilling efficiency: the rheological property of the drilling fluid can be effectively changed, the lower shearing force (the viscosity: 50-55 mPa.s; the shearing force: initial 10-12 Pa/final 12-14Pa) is kept at higher viscosity, the drilling speed is improved by 20-30%, and the drilling efficiency can be greatly improved;
4. high protection advantage: the drilling fluid loss can be quickly reduced, a thick filter cake is formed on a high-permeability filter surface in time, and the drilling fluid is blocked from entering a target layer, so that a good protection effect on a reservoir stratum can be realized;
5. the advantages of low cost are as follows: the dosage is less, the drilling efficiency is high, the comprehensive cost of drilling can be effectively reduced by 20-30%, and the benefit is greatly improved;
6. easy operation and the advantages: the compatibility is good, the operation is simple and convenient, adverse reaction is avoided when the drilling fluid is compounded with other drilling fluids, the effect is good, the foaming rate is low, and the dosage of a defoaming agent is reduced.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example one
The temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent is prepared from the following materials in parts by weight: 60 parts of lignite, 10 parts of sodium hydroxide, 6 parts of a modifier, 0.9 part of ammonium persulfate, 2 parts of hydrolyzed polyacrylonitrile sodium salt, 8 parts of modified asphalt powder and 300 parts of water.
Further, the modifier comprises acrylic acid, acrylamide and sodium acrylate sulfonate, wherein the mass ratio of the acrylic acid to the acrylamide to the sodium acrylate sulfonate is 1.5: 2: 4.
further, the modified asphalt powder is sulfonated asphalt or oxidized asphalt.
A preparation method of the temperature-resistant, salt-resistant, anti-collapse and fluid loss composite mud treatment agent comprises the following steps:
(1) lignite pretreatment: dissolving sodium hydroxide into water to obtain a sodium hydroxide solution, dissolving lignite into the sodium hydroxide solution, then performing microwave heating for 5min at a microwave power of 350W, performing water bath treatment at 100 ℃ for 20min, and removing insoluble substances by a suction filtration method to obtain a coal alkali liquor;
(2) adding a modifier into the coal alkali liquor obtained in the step (1), keeping the temperature at 50 ℃, then adding ammonium persulfate, and stirring at constant temperature for reacting for 3 hours to obtain a modified lignite solution;
(3) putting the hydrolyzed polyacrylonitrile sodium salt and the modified lignite solution obtained in the step (2) into a kneader, setting the temperature to be 100 ℃, and carrying out closed kneading reaction for 1 h;
(4) and (4) adding the modified asphalt powder into the solution obtained after the kneading reaction in the step (3), stirring at constant temperature of 100 ℃ for 0.5h, drying by using boiler steam, and crushing.
Example two
The temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent is prepared from the following materials in parts by weight: 65 parts of lignite, 13 parts of sodium hydroxide, 7 parts of a modifier, 1.1 parts of ammonium persulfate, 3 parts of hydrolyzed polyacrylonitrile sodium salt, 9 parts of modified asphalt powder and 300 parts of water.
Further, the modifier comprises acrylic acid, acrylamide and sodium acrylate sulfonate, wherein the mass ratio of the acrylic acid to the acrylamide to the sodium acrylate sulfonate is 2: 2: 3.5.
further, the modified asphalt powder is sulfonated asphalt or oxidized asphalt.
A preparation method of the temperature-resistant, salt-resistant, anti-collapse and fluid loss composite mud treatment agent comprises the following steps:
(1) lignite pretreatment: dissolving sodium hydroxide into water to obtain a sodium hydroxide solution, dissolving lignite into the sodium hydroxide solution, then performing microwave heating for 4min at a microwave power of 380W, performing water bath treatment at 95 ℃ for 30min, and removing insoluble substances by a suction filtration method to obtain a coal alkali liquor;
(2) adding a modifier into the coal alkali liquor obtained in the step (1), keeping the temperature at 65 ℃, then adding ammonium persulfate, and stirring at constant temperature for reaction for 1h to obtain a modified lignite solution;
(3) putting the hydrolyzed polyacrylonitrile sodium salt and the modified lignite solution obtained in the step (2) into a kneader, setting the temperature to be 80 ℃, and carrying out closed kneading reaction for 1.5 h;
(4) and (4) adding the modified asphalt powder into the solution obtained after the kneading reaction in the step (3), stirring at the constant temperature of 80 ℃ for 1h, drying by using boiler steam, and crushing.
EXAMPLE III
The temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent is prepared from the following materials in parts by weight: 70 parts of lignite, 15 parts of sodium hydroxide, 8 parts of a modifier, 1.2 parts of ammonium persulfate, 4 parts of hydrolyzed polyacrylonitrile sodium salt, 10 parts of modified asphalt powder and 300 parts of water.
Further, the modifier comprises acrylic acid, acrylamide and sodium acrylate sulfonate, wherein the mass ratio of the acrylic acid to the acrylamide to the sodium acrylate sulfonate is 3: 2: 3.
further, the modified asphalt powder is sulfonated asphalt or oxidized asphalt.
A preparation method of the temperature-resistant, salt-resistant, anti-collapse and fluid loss composite mud treatment agent comprises the following steps:
(1) lignite pretreatment: dissolving sodium hydroxide into water to obtain a sodium hydroxide solution, dissolving lignite into the sodium hydroxide solution, then performing microwave heating for 3min at a microwave power of 400W, performing water bath treatment at 90 ℃ for 40min, and removing insoluble substances by a suction filtration method to obtain a coal alkali liquor;
(2) adding a modifier into the coal alkali liquor obtained in the step (1), keeping the temperature at 60 ℃, then adding ammonium persulfate, and stirring at constant temperature for reaction for 1h to obtain a modified lignite solution;
(3) putting the hydrolyzed polyacrylonitrile sodium salt and the modified lignite solution obtained in the step (2) into a kneader, setting the temperature to be 90 ℃, and carrying out closed kneading reaction for 1.2 h;
(4) and (4) adding the modified asphalt powder into the solution obtained after the kneading reaction in the step (3), stirring at a constant temperature of 90 ℃ for 1h, drying by using boiler steam, and crushing.
Testing the performance of the drilling fluid:
preparing composite brine slurry:
15.9g of sodium chloride, 4.6g of magnesium chloride and 1.8g of calcium chloride are added into 350ml of deionized water, stirred and dissolved, 52.5g of calcium soil and 3.15g of anhydrous sodium carbonate are added into a high-speed stirrer, stirred uniformly at high speed and sealed for 24 hours.
The composite saline water slurry is used as base slurry, the composite slurry treating agent is added, the viscosity and the filtration loss are measured according to GB/T16783.2-2012, the high temperature is 220 ℃, and the physical and chemical indexes of the composite slurry treating agent are shown in the following table:
in addition, in the drilling construction of the Shanxi coal-bed gas well, because the filtration loss is not well controlled by using a conventional drilling material, the lower layer of the Liujia ditch group-the Shanxi group has the defects of collapse, sculling, poor quality and serious blocking, after 2.5T (the addition is 2 percent) of the product is adopted, the filtration loss is reduced to 4.8ml, and the construction is recovered to be normal.
In the construction of a horizontal well in a gas production factory, SMC, SMP, SPC and FT-1 conventional drilling materials are used by a certain company, when a drill meets Liujia ditch group-Shikufeng group, after 5T of SMC and SPC and other large quantities of water loss reducing materials are added, the filtration loss is always up to 7-8ml, and after 2T (1.5%) of the product is changed, the filtration loss is reduced to 5 ml.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The temperature-resistant, salt-resistant, anti-collapse and fluid loss reduction composite mud treatment agent is characterized by being prepared from the following materials in parts by weight: 60-70 parts of lignite, 10-15 parts of sodium hydroxide, 6-8 parts of modifier, 0.9-1.2 parts of ammonium persulfate, 2-4 parts of hydrolyzed polyacrylonitrile sodium salt, 8-10 parts of modified asphalt powder and 300 parts of water.
2. The temperature-resistant, salt-resistant, anti-sloughing and fluid loss composite mud treatment agent as claimed in claim 1, wherein the modifier comprises acrylic acid, acrylamide and sodium acrylate sulfonate, and the mass ratio of acrylic acid, acrylamide and sodium acrylate sulfonate is 1.5-3: 2: 3-4.
3. The composite mud treatment agent for resisting temperature, salt and collapse and reducing fluid loss as claimed in claim 1, wherein the modified asphalt powder is sulfonated asphalt or oxidized asphalt.
4. The preparation method of the temperature-resistant, salt-resistant, anti-sloughing and fluid loss composite mud treatment agent as claimed in any one of claims 1-3, comprising the steps of:
(1) lignite pretreatment: dissolving sodium hydroxide into water to obtain a sodium hydroxide solution, dissolving lignite into the sodium hydroxide solution, then performing microwave heating at the power of 350-400W for 3-5min, performing water bath treatment at the temperature of 90-100 ℃ for 20-40min, and removing insoluble substances by a suction filtration method to obtain a coal alkali solution;
(2) adding a modifier into the coal alkali liquor obtained in the step (1), keeping the temperature at 50-65 ℃, then adding ammonium persulfate, and stirring at constant temperature for reacting for 1-3h to obtain a modified lignite solution;
(3) putting the hydrolyzed polyacrylonitrile sodium salt and the modified lignite solution obtained in the step (2) into a kneader, setting the temperature to be 80-100 ℃, and carrying out closed kneading reaction for 1-1.5 h;
(4) adding the modified asphalt powder into the solution obtained after the kneading reaction in the step (3), stirring at the constant temperature of 80-100 ℃ for 0.5-1h, and finally drying and crushing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464007.4A CN111534289A (en) | 2020-05-27 | 2020-05-27 | Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010464007.4A CN111534289A (en) | 2020-05-27 | 2020-05-27 | Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111534289A true CN111534289A (en) | 2020-08-14 |
Family
ID=71974090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010464007.4A Pending CN111534289A (en) | 2020-05-27 | 2020-05-27 | Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111534289A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938803A (en) * | 1989-07-05 | 1990-07-03 | Nalco Chemical Company | Vinyl grafted lignite fluid loss additives |
| US5028271A (en) * | 1989-07-05 | 1991-07-02 | Nalco Chemical Company | Vinyl grafted lignite fluid loss additives |
| CN101177615A (en) * | 2006-11-06 | 2008-05-14 | 中信国安盟固利新能源科技有限公司 | Method for dissolving brown coal by microwave-assisted alkaline weak oxidation process |
| CN101560378A (en) * | 2009-05-27 | 2009-10-21 | 石家庄华莱化工有限公司 | Anti-sloughing diluted filtration reducing agent for drilling fluid and preparation method thereof |
| CN102260555A (en) * | 2011-06-28 | 2011-11-30 | 浙江大学 | Method for changing specific physical and chemical characteristics of coal by utilizing microwave for improving slurry forming performance |
| CN104403112A (en) * | 2014-12-04 | 2015-03-11 | 太原师范学院 | Method for quickly extracting humic acid |
| CN107903880A (en) * | 2017-11-15 | 2018-04-13 | 江苏师范大学 | A kind of preparation method of drilling fluid high temperature resistance sulfonation modifying pitch fluid loss additive |
| CN109777380A (en) * | 2017-11-13 | 2019-05-21 | 中石化石油工程技术服务有限公司 | Shale inhibition filtrate reducer for drilling fluid and preparation method thereof |
-
2020
- 2020-05-27 CN CN202010464007.4A patent/CN111534289A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4938803A (en) * | 1989-07-05 | 1990-07-03 | Nalco Chemical Company | Vinyl grafted lignite fluid loss additives |
| US5028271A (en) * | 1989-07-05 | 1991-07-02 | Nalco Chemical Company | Vinyl grafted lignite fluid loss additives |
| CN101177615A (en) * | 2006-11-06 | 2008-05-14 | 中信国安盟固利新能源科技有限公司 | Method for dissolving brown coal by microwave-assisted alkaline weak oxidation process |
| CN101560378A (en) * | 2009-05-27 | 2009-10-21 | 石家庄华莱化工有限公司 | Anti-sloughing diluted filtration reducing agent for drilling fluid and preparation method thereof |
| CN102260555A (en) * | 2011-06-28 | 2011-11-30 | 浙江大学 | Method for changing specific physical and chemical characteristics of coal by utilizing microwave for improving slurry forming performance |
| CN104403112A (en) * | 2014-12-04 | 2015-03-11 | 太原师范学院 | Method for quickly extracting humic acid |
| CN109777380A (en) * | 2017-11-13 | 2019-05-21 | 中石化石油工程技术服务有限公司 | Shale inhibition filtrate reducer for drilling fluid and preparation method thereof |
| CN107903880A (en) * | 2017-11-15 | 2018-04-13 | 江苏师范大学 | A kind of preparation method of drilling fluid high temperature resistance sulfonation modifying pitch fluid loss additive |
Non-Patent Citations (1)
| Title |
|---|
| 连经社: "油田化学应用技术", 中国石油大学出版社, pages: 253 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102766240B (en) | Fluid loss additive for drilling fluid and preparation method thereof | |
| CN110952952B (en) | Low-permeability reservoir deep profile control and flooding method | |
| CN102876313B (en) | Hydrophobically associated polymer-composite surfactant binary combination flooding system and method | |
| CN107793529B (en) | Polymer for high-temperature-resistant acidizing and fracturing and preparation method thereof | |
| CN109735315B (en) | Environment-friendly delayed crosslinking profile control agent for oil extraction and preparation method and application thereof | |
| CN104388061A (en) | High-temperature-resistant salt-resistant polymer filtrate reducer used in water-based drilling fluid and preparation method thereof | |
| CN102746834B (en) | Polymer filtrate reducer and preparation method thereof | |
| WO2015074588A1 (en) | Zirconium dispersed-particle gel combination flooding system and preparation method thereof | |
| CN107353373A (en) | A kind of preparation method of drilling fluid sulfomethylated humic acid potassium graft polymers fluid loss additive | |
| CN104910330A (en) | High-density fluid loss additive for drilling fluids and preparation method thereof | |
| CN108485625B (en) | Anionic nonionic surfactant thickened oil viscosity-reducing oil displacement agent and preparation method and application thereof | |
| CN104263329A (en) | High-temperature resistant and salt-tolerance filtrate reducer for drilling fluid and preparation method thereof | |
| CN116622353B (en) | Solid-phase-free well killing liquid containing polysaccharide and compound salt and preparation method thereof | |
| CN111876138B (en) | Carbon-based tackifier and preparation method and application thereof | |
| CN110982507B (en) | Acid liquid thickener for acid fracturing and preparation method and application thereof | |
| CN111534289A (en) | Temperature-resistant, salt-resistant, anti-collapse and fluid loss-reducing composite mud treating agent and preparation method thereof | |
| CN108822252B (en) | Amphiphilic high-molecular thickened oil activator and application thereof | |
| CN116948079A (en) | Drag reducer for shale gas reservoir fracturing and preparation method thereof | |
| CN104910878A (en) | Diluent for high temperature resistant salt-tolerant drilling fluid and preparation method of diluent | |
| CN112745454B (en) | Thickener for high-temperature deep well acidification and preparation method thereof | |
| CN104312550A (en) | Anionic surfactant for micro-foam drilling fluid and preparation method thereof | |
| CN107201218B (en) | A kind of water base bentonite viscosity depressant for drilling fluid and preparation method thereof | |
| CN111925477B (en) | Preparation method of fluorine-containing thickening agent capable of thickening hydrochloric acid solution | |
| CN108250355B (en) | Preparation method of thickening agent and fracturing fluid for acidic produced water preparation of oil field | |
| CN114907520B (en) | Fracturing thickening agent for oilfield reinjection water and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |