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Micro-crosslinking polymer fluid loss additive for drilling fluid and preparation method of micro-crosslinking polymer fluid loss additive

A fluid loss control agent and micro-crosslinking technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve problems such as easy degradation, achieve good performance, good high-temperature resistance to fluid loss, improve resistance The effect of thermal performance

Active Publication Date: 2015-03-04
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem that the existing polymer fluid loss control agent is easily degraded under the condition of exceeding 250°C, and to provide a micro-crosslinked polymer fluid loss control agent for drilling fluid

Method used

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  • Micro-crosslinking polymer fluid loss additive for drilling fluid and preparation method of micro-crosslinking polymer fluid loss additive
  • Micro-crosslinking polymer fluid loss additive for drilling fluid and preparation method of micro-crosslinking polymer fluid loss additive
  • Micro-crosslinking polymer fluid loss additive for drilling fluid and preparation method of micro-crosslinking polymer fluid loss additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve NaOH in 75.4mL water to make a solution, add 58.0g fumaric acid under stirring, then add 5.0g CaO, continue stirring until the mixture is uniform; add 31.1g 2-acrylamido-2-methanol to the mixture propanesulfonic acid, 7.1g acrylamide, 9.9g N,N-dimethylacrylamide, 7.1g N-acryloylmorpholine, stir to dissolve, adjust the pH to 8 with NaOH aqueous solution, and adjust the temperature to 25°C Finally, add 0.2g of ammonium persulfate and 0.3g of sodium sulfite aqueous solution, and react under stirring to obtain a gel-like product, which is granulated, dried and pulverized at 80°C to obtain the drilling fluid micro-crosslinking polymerization Fluid loss reducer HRJ-1.

[0027] Its structural formula is:

[0028]

Embodiment 2

[0030] Dissolve KOH in 73.0mL of water to make a solution, add 28.8g of acrylic acid under stirring, then add 6.0g of CaO, continue stirring until the mixture is uniform; add 31.0g of 2-acrylamido-2-methylpropane to the mixture Sulfonic acid, 10.7g acrylamide, 5.5g N-vinyl-2-pyrrolidone, 12.7g N,N-diethylacrylamide, stir to dissolve, adjust the pH to 9 with KOH aqueous solution, and adjust the temperature to 30°C Finally, add 0.4g of potassium persulfate and 0.3g of sodium bisulfite aqueous solution, and react under stirring to obtain a gel-like product, which is granulated, dried and pulverized at 120°C to obtain the drilling fluid. Cross-linked polymer fluid loss additive HRJ-2.

[0031] Its structural formula is:

[0032]

Embodiment 3

[0034] Dissolve NaOH in 54.0mL water to make a solution, add 43.0g methacrylic acid under stirring, then add 3.0g CaO, continue stirring until the mixture is uniform; add 41.4g 2-acrylamido-2-methyl Propanesulfonic acid, 10.7g acrylamide, 11.1g N-vinyl-2-pyrrolidone, 5.0g N,N-dimethylacrylamide, 14.1g N-acryloylmorpholine, stirred to dissolve, adjusted with NaOH aqueous solution The pH is 10. After the temperature is adjusted to 35°C, add 0.3g of ammonium persulfate and 0.3g of sodium bisulfite aqueous solution and react under stirring to obtain a gel-like product, which is granulated and dried at 100°C Pulverize to obtain the micro-crosslinked polymer fluid loss reducer HRJ-3 for drilling fluid.

[0035] Its structural formula is:

[0036]

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Abstract

The invention relates to a micro-crosslinking polymer fluid loss additive for drilling fluid and a preparation method of the micro-crosslinking polymer fluid loss additive and belongs to the technical field of a preparation method of chemical high-molecular polymers of oil drilling fields. The micro-crosslinking polymer fluid loss additive is prepared from an organic acid monomer A with carboxyl, acrylamide, a monomer B for inhibiting acylamino hydrolysis, a temperature-resistant monomer C with a large side group, and a crosslinking agent by adopting aqueous solution copolymerization reaction under the initiation of an oxidation-reduction initiator system; and the obtained gel product is pelletized, baked and crushed, so as to obtain the micro-crosslinking polymer fluid loss additive for drilling fluid. The micro-crosslinking polymer fluid loss additive disclosed by the invention has good high-temperature fluid loss resistance; after the micro-crosslinking polymer fluid loss additive is added to 4% base slurry and is aged for 16 hours at 270 DEG C, the filter loss is reduced along with the increase of the micro-crosslinking polymer fluid loss additive disclosed by the invention; and when the addition amount of the micro-crosslinking polymer fluid loss additive is 0.01g / mL, the filter loss is reduced to 8.2mL from 46.0mL so that good performance of the drilling fluid is kept at 270 DEG C.

Description

technical field [0001] The invention relates to a micro-crosslinked polymer fluid loss reducer for drilling fluid and a preparation method thereof, which belongs to the technical field of chemical high molecular polymers in petroleum drilling and oilfields. Background technique [0002] With the rapid increase in the demand for oil and gas resources in the world and the advancement of drilling technology, countries around the world have increased investment in the exploration and development of oil and gas resources in deep formations. put forward higher requirements. Whether the drilling fluid can maintain a low fluid loss under high temperature conditions in deep wells depends on whether the temperature resistance of the fluid loss control agent is good, which requires higher and higher requirements for the temperature resistance of the fluid loss control agent of the drilling fluid. . [0003] In recent years, the research of some copolymer fluid loss reducers has been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F222/02C08F220/58C08F220/56C08F220/54C08F220/06C08F226/10
CPCC08F220/06C08F220/58C08F222/02C09K8/035C08F220/56C08F220/54C08F226/06C08F226/10
Inventor 王旭张丽君胡小燕张滨王中华万龙
Owner CHINA PETROCHEMICAL CORP
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