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Preparation method for hydrophobic associated polymer coating agent used for drilling fluid

A hydrophobic association, polymer technology, applied in drilling compositions, sulfonate preparation, chemical instruments and methods, etc., can solve the problems of inability to form a network, poor coating ability, etc., achieve excellent inhibition of dispersion, The effect of good rheological properties, good temperature resistance and salt resistance

Inactive Publication Date: 2016-12-14
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for preparing a hydrophobic association polymer coating agent for drilling fluids, which overcomes the shortcomings of the existing polymer coating agents in water-sensitive and other complex formations due to the inability to form a network and poor coating ability. The obtained polymer coating agent has strong dispersion inhibition, strong resistance to temperature and salt, and fast dissolution rate

Method used

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  • Preparation method for hydrophobic associated polymer coating agent used for drilling fluid
  • Preparation method for hydrophobic associated polymer coating agent used for drilling fluid
  • Preparation method for hydrophobic associated polymer coating agent used for drilling fluid

Examples

Experimental program
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Effect test

Embodiment 1

[0018] In order to illustrate the technical solution of the present invention more clearly, the following examples are used to further illustrate. Embodiment 1: the preparation of monomer SADPMS

[0019] The preparation steps of monomer SADPMS are as follows:

[0020] (1) Add 20g of phenol and 16g of acrylic acid to a 100mL three-necked flask, install a reflux condenser and communicate with the gas receiver, slowly add 24g of thionyl chloride to the above mixture, and then put the three-necked flask in a water bath Heating for 1 hour; then the reaction device was placed on the ceramic metal net for heating, and continued to complete the reaction in about 20 minutes when the component reached the reflux temperature; after the reaction product was distilled, 24g (80%) of colorless oily phenyl acrylate was obtained.

[0021] (2) Add 18.7g of anhydrous aluminum trichloride and 20mL of carbon disulfide to a 100mL three-necked flask, respectively install a dropping funnel, a stirre...

Embodiment 2

[0024] Embodiment 2: Preparation of hydrophobic association polymer coating agent

[0025] The preparation method of the hydrophobic association polymer coating agent is: 2g purified 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 7.2mL of acrylic acid (AA) and a certain amount of water are mixed together Put it into a beaker, dissolve evenly, add a pH adjuster to adjust the pH to 9-10, then add 9.4g of acrylamide (AM), 0.9g of 5-acryloyl-2-dodecyloxybenzene Sodium methanesulfonate (SADPMS), after dissolving evenly, the 40mL raw material aqueous solution has been prepared so far, and nitrogen gas is passed for 15-30 minutes at room temperature, and then the prepared raw material aqueous solution is evenly placed in a constant temperature water bath. When the temperature reaches 40°C 0.032g of initiator V50 was added while stirring, and reacted at 40°C. After 4 hours of heat preservation, it was precipitated with ethanol and extracted for 4 hours, crushed and dried to obtain ...

Embodiment 3

[0026] Embodiment 3: Preparation of hydrophobic association polymer coating agent

[0027] The performance evaluation of the hydrophobic association polymer coating agent for drilling fluid prepared according to the embodiment of the present invention: base slurry composition: tap water + 0.2% soda ash + 4% bentonite (Xinjiang). The specific preparation method is as follows: under the condition of keeping stirring, add 1.0g of soda ash and 20g of sodium bentonite to an enamel cup filled with 500mL of tap water, stir for 20 minutes at a drilling speed of 2000r / min, and then use a high-speed stirrer at 10000r / min Stir for 2 minutes at 10 min, and leave to stand at room temperature for 24 hours to obtain a 4% base slurry.

[0028] 1. Routine performance evaluation

[0029] Take 4 parts of 400mL of the prepared 4% base slurry, add 0.3% product, C-DBY and FA-367 respectively while stirring, and the remaining group is used as a blank control to make it evenly dispersed. For rheolo...

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Abstract

The invention provides a preparation method for a hydrophobic associated polymer coating agent used for a drilling fluid. The coating agent is a polyacrylamide polymer and has good application effect in application to shale and sandstone strata. According to the invention, hydrophobic groups are introduced into the macromolecular chain of a polymer; in an aqueous solution, the hydrophobic groups aggregate due to association effect, so the macromolecular chain is allowed to generate intermolecular association effect; associated molecules form a three-dimensional net structure, and the viscosity of a solution is greatly improved; even a polymer with low molecular weight presents high viscosity; thus, the concept of introduction of hydrophobic association into the polymer coating agent is favorable for improving the coating effect of the polymer to a certain extent. The preparation method is simple in preparation process, easily controllable in reaction and fast in polymerization speed; and the prepared polymer coating agent has good temperature resistance, salt resistance and anti-shearing performance, shows strong capacity in coating and inhibiting dispersion of clay, shows good dissolvability in the drilling fluid, and has stable long-term storage performance and a wide application scope.

Description

technical field [0001] The invention discloses a preparation method of a hydrophobic association polymer coating agent for drilling fluid. The preparation process of the method is simple, the reaction is easy to control, and the polymerization speed is fast. The polymer coating agent has strong temperature resistance , anti-salt and anti-shear performance, strong ability to disperse the coating and inhibit clay, good solubility in drilling fluid, stable performance for long-term storage, and wide application range. Background technique [0002] Coating agent is a widely used and very important organic treatment agent in water-based drilling fluid. It relies on chemical bonds to adsorb on the surface of cuttings and wrap them around to prevent hydration and dispersion of cuttings in contact with water molecules. At the same time, the coating agent for drilling fluid also has the characteristics of reducing water loss, improving flow pattern and enhancing the lubricity of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08F220/56C08F220/06C08F220/58C08F216/36C07C309/24C07C303/32
CPCC07C309/24C08F220/06C08F220/56C09K8/035C08F220/585C08F216/36
Inventor 马丽华罗飞邓小刚李一平胡正文孟义征
Owner SOUTHWEST PETROLEUM UNIV