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Phosphorus-containing high-temperature-resistant drilling-fluid viscosity reducer and preparation method thereof

A technology of viscosity reducer and drilling fluid, applied in the field of phosphorus-containing anti-high temperature drilling fluid viscosity reducer and its preparation, can solve the problems of high price, difficult to apply on a large scale, difficult to source, etc. The effect of sticking

Active Publication Date: 2015-01-28
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent 200910065374.0, a preparation method of drilling fluid viscosity reducer is disclosed. Because the carboxyl and sulfonic acid groups contained in the polymer molecule have insufficient viscosity reduction performance under salt water conditions, they cannot fully meet the field needs.
In the patent application 201210353696.7, a phosphonic acid group-containing polymer drilling fluid viscosity reducer and its preparation method are disclosed. Although the viscosity reducer performance in salt water conditions is improved, the raw material 2-acrylamido-2-methyl Pylphosphonic acid monomer is expensive and difficult to source, making it difficult to apply it on a large scale

Method used

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  • Phosphorus-containing high-temperature-resistant drilling-fluid viscosity reducer and preparation method thereof
  • Phosphorus-containing high-temperature-resistant drilling-fluid viscosity reducer and preparation method thereof
  • Phosphorus-containing high-temperature-resistant drilling-fluid viscosity reducer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Dissolve 10g of acrylic acid, 8g of 2-acrylamido-2-methylpropanesulfonic acid, 1g of sodium hypophosphite and 1g of dimethyl diallyl ammonium chloride in 50g of water for later use, and dissolve 0.1g of ammonium persulfate in 30g of Clear water is ready for use, add the monomer solution of the mixture into a four-necked flask and raise the temperature to 50°C, then add the ammonium persulfate solution into the reaction system, raise the temperature of the system to 90°C and react for 1 hour to obtain a viscosity reducer with a solid phase content of 20% The product, after the reaction, neutralizes the pH value of the system with sodium hydroxide to 8, and obtains a phosphorus-containing anti-high temperature drilling fluid viscosity reducer with an average molecular weight of about 20,000 after drying and crushing. Its structural formula is:

[0020]

[0021] The amount ratio of x:y:z substances is 13.9:3.9:0.6.

Embodiment 2

[0023] Dissolve 10g of methacrylic acid, 7g of sodium allyl sulfonate, 0.5g of sodium phosphite and 2.5g of diethyl diallyl ammonium chloride in 15g of clear water for later use, and dissolve 0.5g of ammonium persulfate in 5g of clear water for later use For use, add the monomer solution of the mixture into a four-necked flask and raise the temperature to 40°C, then add the ammonium persulfate solution into the reaction system, raise the temperature of the system to 95°C for 2 hours, and obtain a viscosity reducer product with a solid phase content of 50%. After the reaction, use sodium hydroxide to neutralize the pH value of the system to 9. After drying and crushing, a phosphorus-containing anti-high temperature drilling fluid viscosity reducer with an average molecular weight of about 15,000 is obtained. Its structural formula is:

[0024]

[0025] The amount ratio of x:y:z substances is 11.6:4.9:1.3.

Embodiment 3

[0027] Dissolve 10g of itaconic acid, 5g of 2-acryloyloxybutyl sulfonic acid, 2g of sodium phosphite and 3g of diethyldiallyl ammonium chloride in 150g of water for later use, and dissolve 1g of ammonium persulfate in 30g of clear water for later use , adding the monomer solution of the mixture into a four-necked flask and raising the temperature to 60°C, then adding the ammonium persulfate solution into the reaction system, raising the temperature of the system to 100°C for 1.5 hours to obtain a viscosity reducer product with a solid phase content of 10%, After the reaction, use sodium hydroxide to neutralize the pH value of the system to 8.5. After drying and crushing, a phosphorus-containing anti-high temperature drilling fluid viscosity reducer with an average molecular weight of about 8000 is obtained. Its structural formula is:

[0028]

[0029] The amount ratio of x:y:z substances is 7.7:2.4:1.6.

[0030] Embodiment 4~9 steps are identical with embodiment 1, and reac...

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Abstract

The invention relates to a phosphorus-containing high-temperature-resistant drilling-fluid viscosity reducer and a preparation method thereof. The reducer is obtained by mixing a carboxyl monomer A, a sulfo-group-containing monomer B, a phosphorus-containing compound C and a cation monomer D according to the mass ratio of 10:5-10:0.5-2:1-3 and performing free radical polymerization. The average molecular mass of the viscosity reducer is 3000-20000. The obtained viscosity is capable of resisting the temperature up to 240 DEG C or more, is strong in salt and calcium pollution resistance, has good viscosity reducing effect under the conditions of high temperature and salt and calcium pollution compared with conventional drilling-fluid viscosity reducers, is capable of effectively improving the rheological property of a drilling fluid, is relatively low in cost, and is beneficial for large-scale application.

Description

technical field [0001] The invention relates to a phosphorus-containing anti-high temperature drilling fluid viscosity reducer and a preparation method thereof, belonging to the technical field of treatment agents for oilfield drilling fluids. technical background [0002] During the drilling process of deep wells and ultra-deep wells, due to the influence of geothermal gradient, the drilling fluid is under the condition of high temperature above 200°C for a long time, and there are problems such as high-temperature dispersion of clay, high-temperature degradation of organic polymer compounds, high-temperature crosslinking of treatment agents, etc., resulting in The drilling fluid thickens and its rheology becomes poor. In order to solve this problem, people began to use viscosity reducer to control the rheological properties of drilling fluid as early as the late 1930s. In the early days, people generally used inorganic phosphate, tannin, iron chromium lignosulfonate FCLS ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24C08F220/06C08F222/02C08F220/58C08F228/02C08F220/38C08F226/02
CPCC08F220/06C08F222/02C09K8/035C09K8/24C08F220/382C08F226/02
Inventor 谢建宇张滨胡小燕王旭李彬吕跃滨
Owner CHINA PETROCHEMICAL CORP
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