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Cationic polymer coating agent for water-base drilling fluid and preparation method thereof

A technology of cationic polymer and water-based drilling fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of increased mud filtration loss, unstable mud performance, and high cost of drilling fluid, and achieve operational Simplicity, cost reduction, and convenient application

Inactive Publication Date: 2010-07-14
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the water-based drilling fluid system uses a high molecular weight (>3 million) anionic polymer coating agent to coat the cuttings produced during the drilling process to prevent the cuttings from breaking when they circulate in the annular space, but this high molecular weight Flocculation phenomenon sometimes occurs in the coating agent, resulting in increased mud filtration loss and unstable mud performance
The water-based drilling fluid system also uses low molecular weight coating agents (such as ULTRACAP produced by Microbar), but the amount used in drilling is relatively large, and most of them rely on foreign imports, resulting in high drilling fluid costs

Method used

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  • Cationic polymer coating agent for water-base drilling fluid and preparation method thereof
  • Cationic polymer coating agent for water-base drilling fluid and preparation method thereof
  • Cationic polymer coating agent for water-base drilling fluid and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] The synthesis reaction is carried out in a double-layer jacketed enamel reactor with steam heating and electric stirring. Mix 180kg N, N dimethylacrylamide, 60kg acryloyloxyethyltrimethylammonium chloride and 490kg distilled water together, pump the prepared solution into the reaction kettle, after dissolving evenly, add 10kg vinyl sulfonate Acid, 0.7kg sodium formate, 5.2kg urea, after dissolving evenly, add 5.5kg NaOH to adjust the pH of the system to 6-7, so far the preparation of the raw material aqueous solution is completed, and pass N at room temperature 2 15 minutes to 30 minutes, then put the prepared raw material aqueous solution into the reaction tank evenly, add 0.09kg of ammonium persulfate and 0.18kg of sodium bisulfite initiator while draining the liquid, at a temperature of 10°C-30°C The lower solution polymerized for 4 hours, discharged, kneaded and dried in a kneader, and the dried product was further pulverized and sieved to obtain a cationic polymer...

Embodiment 2

[0047] The synthesis reaction is carried out in a double-layer jacketed enamel reactor with steam heating and electric stirring. Mix 451kg of 40wt% acrylamide, 34.6kg of methacryloyloxyethyltrimethylammonium chloride and 220kg of distilled water together, pump the prepared solution into the reactor, and after dissolving evenly, add 14kg of 2-acrylamide -2 methylpropanesulfonic acid, 0.89kg sodium formate, 4.8kg urea, after dissolving evenly, adjust the pH of the system to 6-8 with 4.5kg KOH. 2 15 minutes to 30 minutes, then put the prepared raw material aqueous solution into the reaction tank evenly, add 0.07kg of ammonium persulfate and 0.12kg of sodium bisulfite initiator while draining the liquid, at a temperature of 10°C-30°C The lower solution polymerized for 4 hours, discharged, kneaded and dried in a kneader, and the dried product was further pulverized and sieved to obtain a cationic polymer coating agent, which has the following structural formula:

[0048]

[004...

Embodiment 3

[0058] The synthesis reaction is carried out in a double-layer jacketed enamel reactor with steam heating and electric stirring. Mix 310kg of N,N-diethylacrylamide, 20kg of dimethyl diallyl ammonium chloride and 400kg of distilled water together, pump the prepared solution into the reaction kettle, after dissolving evenly, add 8kg of methacrylic acid, After 0.73kg sodium formate and 4.6kg urea are dissolved evenly, adjust the pH of the system to 6-7 with 2kg NaOH. 2 15 minutes to 30 minutes, then put the prepared raw material aqueous solution into the reaction tank evenly, and add 0.05kg potassium persulfate and 0.08kg sodium bisulfite initiator while draining the liquid, at a temperature of 10°C-30°C The solution was polymerized for 4 hours, discharged, kneaded and dried in a kneader, and the dried product was further pulverized and sieved to obtain a cationic polymer coating agent, which had the following structure:

[0059]

[0060] Where x is 40-120, y is 1-20, and z i...

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Abstract

The invention relates to a cationic polymer coating agent for water-base drilling fluid, which has the following structural formula, wherein A is a first monomer which is selected from one of N,N-dimethylacrylamide, acrylamide or N,N-diethylacrylamide, B is a second monomer which is selected from one of methacryloyloxyethyl trimethyl ammonium chloride, dimethyldiallylammonium chloride or acryloyloxyethyl trimethyl ammonium chloride, and C is a third monomer which is selected from 2-acrylamido-2-methylpropanesulfonic acid, vinyl sulfonic acid or methacrylic acid, wherein x is 40-120, y is 1-20, and z is 1-10. The invention also relates to a preparation method of the cationic polymer coating agent. When the cationic polymer coating agent of the invention is used for a water-base drilling fluid system, the cationic polymer coating agent has good rock debris coating effect and can improve the performance of the water-base drilling fluid system.

Description

Technical field [0001] The present invention relates to a coating agent for water-based drilling fluid and a preparation method thereof, in particular to a cationic polymer coating agent for water-based drilling fluid and a preparation method thereof. Background technique [0002] Currently, a new type of water-based drilling fluid (HPWBM, also known as amine-based drilling fluid) is widely used abroad. This water-based drilling fluid is mainly composed of shale inhibitor, coating agent, dispersant and fluid loss agent. This water-based drilling fluid is considered to be a new drilling fluid system that can replace oil-based drilling fluid and can drill safely. [0003] In this water-based drilling fluid system, the coating agent is an important component. It can not only assist the shale inhibitor, play the role of coating to inhibit the hydration and dispersion of clay, but also can form on the surface of shale and drill cuttings. Protective film to prevent drill cutting...

Claims

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Application Information

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IPC IPC(8): C09K8/035C08F220/56
Inventor 冯玉军蔡久能刘雪婧罗建生王碧清李伟赵静
Owner CHINA NAT OFFSHORE OIL CORP
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