CN111978471B - Filtrate reducer for drilling fluid and preparation method thereof - Google Patents
Filtrate reducer for drilling fluid and preparation method thereof Download PDFInfo
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- CN111978471B CN111978471B CN201910424151.2A CN201910424151A CN111978471B CN 111978471 B CN111978471 B CN 111978471B CN 201910424151 A CN201910424151 A CN 201910424151A CN 111978471 B CN111978471 B CN 111978471B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
- C08F251/02—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof on to cellulose or derivatives thereof
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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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
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Abstract
The invention relates to a filtrate reducer for drilling fluid and a preparation method thereof. The preparation method of the filtrate reducer for drilling fluid comprises the following steps: sequentially adding water, a dispersing agent and polyanionic cellulose into a reaction kettle, heating to 60-90 ℃, uniformly stirring, and introducing N 2 Protecting, adding a certain amount of lipophilic monomer and initiator after 30min, stirring and reacting for 2-4h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid. The oil-based filtrate reducer provided by the invention can be applied to diesel oil, white oil and synthetic base drilling fluid systems, and the product is environment-friendly and has remarkable filtrate reduction effect.
Description
Technical Field
The invention relates to a fluid loss additive for drilling fluid and a preparation method thereof, and the fluid loss additive for drilling fluid prepared by the invention is suitable for the technical field of oilfield drilling engineering.
Background
In recent years, with the increasing demand of domestic and foreign energy sources, petroleum exploration and development gradually drills into deep and complex stratum, and the number of complex wells such as deep wells, ultra-deep wells, highly-inclined wells, multi-branch wells, horizontal wells and the like is increased, and in addition, the demand of oil-based drilling fluid is increased gradually for the development of unconventional oil and gas resources. The fluid loss additive is an indispensable component in the drilling fluid treatment agent, and has the main effects of enabling the drilling fluid to form a thin and compact mud cake on a well wall, thereby playing roles of reducing the fluid loss, improving the quality of the mud cake and the like, and is an important chemical treatment agent for maintaining the stability of the drilling fluid, improving the rheological property of the drilling fluid, reducing the fluid loss of harmful fluid to a stratum, stabilizing the well wall, and ensuring the rule of the well diameter and the oil-gas layer. The device has important effects on safe and efficient drilling and preventing drilling accidents. The development of the filtration-reducing agent for the oil-based drilling fluid is less in China, mainly asphalt and organic amine modified humic acid filtration-reducing agents, wherein asphalt products have the defects of environmental pollution, large consumption and influence on drilling speed, and the application of the filtration-reducing agent is limited in the conventional oil-based drilling fluid formula at present; the organic amine modified humic acid filtrate reducer has the defect of poor dispersion in oil-based drilling fluid, particularly in low-toxicity environment-friendly base oil, has poorer dispersibility and has a certain gap between the filtrate reducing effect and asphalt products.
The polyanion cellulose is an excellent environment-friendly fluid loss additive for water-based drilling fluid, has no biotoxicity and is easy to degrade, but most of the polyanion cellulose in the molecular structure is hydrophilic groups, cannot be dissolved in oil-based drilling fluid and is difficult to disperse in an oil-based drilling fluid system, and the fluid loss additive cannot play a role in fluid loss.
Disclosure of Invention
Aiming at overcoming the defects of the prior art, the invention provides the drilling fluid filtrate reducer which has no environmental pollution, good dispersion performance in oil-based drilling fluid and excellent filtrate reducing effect and the preparation method thereof.
The aim of the invention is achieved by the following technical scheme: the filtrate reducer for the drilling fluid is characterized by comprising lipophilic modified polyanionic cellulose.
In general, the fluid loss additive for drilling fluids comprises the following components: the anionic cellulose, lipophilic monomer, initiator and dispersant, wherein the mass percentage of each component is as follows: polyanionic cellulose: 10-20%, lipophilic monomer: 10-30% of an initiator: 0.1-1%, dispersant: 0.5-2% and the balance of water.
The preparation method of the filtrate reducer for the drilling fluid comprises the following steps: adding dispersant and polyanionic cellulose into water in turn according to a certain proportion, heating to 60-90 ℃, stirring uniformly, and introducing N 2 And (3) protecting, adding an oleophilic monomer and an initiator, stirring and reacting for 2-4 hours, cooling to room temperature, drying and crushing to obtain the filtrate reducer for the oil-based drilling fluid.
The inlet N 2 The lipophilic monomer is added after protection, preferably 30 min.
The lipophilic monomer is one or a mixture of more of methyl methacrylate, ethyl methacrylate and butyl methacrylate.
The initiator is as follows: ammonium persulfate, potassium persulfate and ceric ammonium sulfate.
The dispersing agent is as follows: one or two of polyvinyl alcohol and polyvinylpyrrolidone.
The filtrate reducer for drilling fluid provided by the invention is applied to an oil-based drilling fluid system.
The dosage of the filtrate reducer for the drilling fluid is 0.5-3% w/v in the oil-based drilling fluid.
The filtrate reducer for drilling fluid disclosed by the invention has good lipophilicity, can be effectively dispersed and dissolved in base oil, has good compatibility with other drilling fluid treatment agents, and has no pollution to the environment and no biotoxicity.
Detailed Description
For a better understanding of the present invention, the following examples are set forth to illustrate the invention further, but are not to be construed as limiting the invention.
Example 1
Adding 69.4g of water, 0.5g of polyvinyl alcohol and 20.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 60 ℃, and introducing N 2 And (3) protecting, after 30min, adding 10.0g of methyl methacrylate and 0.1g of ammonium persulfate, stirring and reacting for 2h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 2
Adding 47.0g of water, 2.0g of polyvinyl alcohol and 20.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 90 ℃, and introducing N 2 And (3) protecting, after 30min, adding 30.0g of methyl methacrylate and 1.0g of potassium persulfate, stirring for reaction for 4h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 3
Adding 57.0g of water, 2.0g of polyvinylpyrrolidone and 20.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 90 ℃, and introducing N 2 Protecting, adding 20.0g of ethylene methacrylate after 30minAnd (3) stirring and reacting the ester with 1.0g of ammonium cerium sulfate for 3 hours, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 4
Adding 68.5g of water, 1.0g of polyvinylpyrrolidone and 20.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 80 ℃, and introducing N 2 And (3) protecting, after 30min, adding 10.0g of butyl methacrylate and 0.5g of ammonium cerium sulfate, stirring and reacting for 2h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 5
Adding 63.0g of water, 1.5g of polyvinyl alcohol and 15.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 70 ℃, and introducing N 2 And (3) protecting, after 30min, adding 20.0g of ethyl methacrylate and 0.5g of ammonium cerium sulfate, stirring and reacting for 2h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 6
Adding 74.0g of water, 0.5g of polyvinylpyrrolidone and 15.0g of polyanionic cellulose into a reaction kettle, uniformly stirring at 60 ℃, and introducing N 2 And (3) protecting, after 30min, adding 10.0g of methyl methacrylate and 0.5g of ammonium persulfate, stirring and reacting for 2h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 7
Adding 47.0g of water, 2.0g of polyvinylpyrrolidone and 20.0g of polyanionic cellulose into a reaction kettle, stirring uniformly at 60 ℃, and introducing N 2 And (3) protecting, after 30min, adding 30.0g of butyl methacrylate and 1.0g of ammonium persulfate, stirring and reacting for 2h, cooling to room temperature, drying and crushing to obtain the filtrate reducer for drilling fluid.
Example 8
The samples of examples 1-7 were evaluated for performance.
Chai Youji drilling fluid formula: 240mL diesel oil+6 g organic soil+60 mL 20% CaCl 2 Solution +12g main emulsifier +4g auxiliary emulsifier +6g filtrate reducer;
the formula of the white oil-based drilling fluid comprises the following components: 240mL5# white oil +6g organo +60mL 20% CaCl 2 Solution +12g main emulsifier +4g auxiliary emulsifier +6g filtrate reducer;
the formula of the synthetic base drilling fluid comprises the following components: 240mL LAO+6g organic soil+60 mL 20% CaCl 2 Solution+12 g main emulsifier+4 g auxiliary emulsifier+6 g filtrate reducer.
The performance of the fluid loss additives in these three drilling fluids was tested separately and the test results were as follows.
Table 1 test results in diesel-based drilling fluids
Table 2 test results in white oil based drilling fluids
TABLE 3 test results in synthetic base drilling fluids
From the data in tables 1, 2 and 3, it can be seen that: chai Youji drilling fluid, white oil-based drilling fluid and synthetic-based drilling fluid are added with the filtrate reducer, and the API filtrate and high-temperature high-pressure filtrate loss of the filtrate reducer are much smaller than those of drilling fluid without the filtrate reducer, so that the filtrate reducer has remarkable filtrate reducer failure effect in oil-based drilling fluid.
The test result shows that the friction-reducing and resistance-reducing agent has no influence on rheological property of the drilling fluid system, can obviously improve lubricating property of well slurry, and has good compatibility.
Claims (7)
1. The filtrate reducer for the drilling fluid is characterized by comprising the following components: the anionic cellulose, lipophilic monomer, initiator and dispersant, wherein the mass percentage of each component is as follows: polyanionic cellulose: 10-20%, lipophilic monomer: 10-30% of an initiator: 0.1-1%, dispersant: 0.5-2%, the rest is water;
the drilling fluid is used for reducing filtration lossA process for the preparation of a formulation comprising the steps of: adding dispersant and polyanionic cellulose into water in turn according to a proportion, heating to 60-90 ℃, stirring uniformly, and introducing N 2 And (3) protecting, adding a lipophilic monomer and an initiator, stirring and reacting for 2-4 hours, cooling to room temperature, drying and crushing to obtain the filtrate reducer for the oil-based drilling fluid.
2. The fluid loss additive for drilling fluids according to claim 1, wherein N is introduced 2 Protecting, and adding lipophilic monomer after 30 min.
3. The fluid loss additive for drilling fluid according to claim 1, wherein the lipophilic monomer is one or a mixture of several of methyl methacrylate, ethyl methacrylate and butyl methacrylate.
4. The fluid loss additive for drilling fluids according to claim 1, wherein the initiator is: ammonium persulfate, potassium persulfate and ceric ammonium sulfate.
5. The fluid loss additive for drilling fluid according to claim 1, wherein the dispersant is: one or two of polyvinyl alcohol and polyvinylpyrrolidone.
6. The fluid loss additive for drilling fluids according to claim 1, which is applied to oil-based drilling fluid systems.
7. The fluid loss additive for drilling fluids according to claim 6, wherein the fluid loss additive for drilling fluids is used in an amount of 0.5% -3% w/v in oil-based drilling fluids.
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| CN201910424151.2A CN111978471B (en) | 2019-05-21 | 2019-05-21 | Filtrate reducer for drilling fluid and preparation method thereof |
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| CN201910424151.2A CN111978471B (en) | 2019-05-21 | 2019-05-21 | Filtrate reducer for drilling fluid and preparation method thereof |
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| CN111978471B true CN111978471B (en) | 2023-05-16 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045587A (en) * | 1989-03-17 | 1990-09-26 | 成都科技大学 | A kind of manufacture method of lower-loss agent of cement pulp |
| US6620769B1 (en) * | 2000-11-21 | 2003-09-16 | Hercules Incorporated | Environmentally acceptable fluid polymer suspension for oil field services |
| CN106854259A (en) * | 2015-12-08 | 2017-06-16 | 中国石油化工股份有限公司 | A kind of water-base drilling fluid fluid loss additive and preparation method thereof |
| CN108117621A (en) * | 2016-11-30 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of thickening type anticalcium salt polymer filtrate reducer and preparation method |
-
2019
- 2019-05-21 CN CN201910424151.2A patent/CN111978471B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1045587A (en) * | 1989-03-17 | 1990-09-26 | 成都科技大学 | A kind of manufacture method of lower-loss agent of cement pulp |
| US6620769B1 (en) * | 2000-11-21 | 2003-09-16 | Hercules Incorporated | Environmentally acceptable fluid polymer suspension for oil field services |
| CN106854259A (en) * | 2015-12-08 | 2017-06-16 | 中国石油化工股份有限公司 | A kind of water-base drilling fluid fluid loss additive and preparation method thereof |
| CN108117621A (en) * | 2016-11-30 | 2018-06-05 | 中国石油化工股份有限公司 | A kind of thickening type anticalcium salt polymer filtrate reducer and preparation method |
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Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Patentee before: CHINA PETROLEUM & CHEMICAL Corp. |
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