High temperature resistant and compound salt resistant viscosity reduction agent for drilling fluid and preparation method thereof

A technology of high temperature resistance and compound salt, which is applied in the direction of drilling compositions, chemical instruments and methods, etc. It can solve the problems of high price, not very outstanding high temperature resistance, limited high temperature resistance or salt resistance, and calcium resistance. , to achieve the effects of low cost, remarkable wellbore stability and outstanding calcium resistance

Inactive Publication Date: 2012-03-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] According to the characteristics and application effects of the existing viscosity reducers, the natural viscosity reducers have outstanding viscosity reduction ability, but their high temperature resistance, salt resistance and calcium resistance are limited; the molecular structure of artificially synthesized viscosity red

Method used

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  • High temperature resistant and compound salt resistant viscosity reduction agent for drilling fluid and preparation method thereof
  • High temperature resistant and compound salt resistant viscosity reduction agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare materials according to the ratio (mass ratio) of deionized water:acrylic acid:acrylonitrile:maleic anhydride:calcium lignosulfonate:hydrogen peroxide=100:30:10:15:20:10.

[0031] a. Graft polymerization reaction

[0032] For example, add 1000kg of deionized water into a 3000L enamel reaction kettle, start stirring, slowly add 300kg of acrylic acid, 150kg of maleic anhydride, 100kg of acrylonitrile and 200kg of calcium lignosulfonate, raise the temperature to 55°C, and slowly Add 100kg of hydrogen peroxide, control the adding speed, keep boiling slightly, stir and react for about 1 hour, and a yellow liquid is formed.

[0033] Note: Controlling the reaction temperature in this step is the key. If the reaction is too violent, the drop rate of hydrogen peroxide should be slowed down.

[0034] b. Complexation reaction

[0035] Cool the reaction solution to about 50°C, add 92.5kg of ferrous sulfate and 55.5kg of zirconium oxychloride to the reaction kettle under st...

Embodiment 2

[0040] Prepare materials according to the ratio (mass ratio) of deionized water:acrylic acid:acrylonitrile:maleic anhydride:calcium lignosulfonate:hydrogen peroxide=100:40:20:20:30:25.

[0041] a. Graft polymerization reaction

[0042] For example, add 1000kg of deionized water into a 5000L enamel reaction kettle, start stirring, slowly add 400kg of acrylic acid, 200kg of maleic anhydride, 200kg of acrylonitrile and 300kg of calcium lignosulfonate, raise the temperature to 60°C, and slowly Add 250kg of hydrogen peroxide, control the adding speed, keep boiling slightly, stir and react for about 1 hour, and a yellow liquid is formed.

[0043] Note: Controlling the reaction temperature in this step is the key. If the reaction is too violent, the drop rate of hydrogen peroxide should be slowed down.

[0044] b. Complexation reaction

[0045] Cool the reaction liquid to about 50°C, add 188kg of ferrous sulfate and 141kg of zirconium oxychloride to the reaction kettle, and use fer...

Embodiment 3

[0050] Prepare materials according to the ratio (mass ratio) of deionized water:acrylic acid:acrylonitrile:maleic anhydride:calcium lignosulfonate:hydrogen peroxide=100:35:15:18:25:20.

[0051] a. Graft polymerization reaction

[0052] For example, add 1000kg of deionized water into a 3000L enamel reaction kettle, start stirring, slowly add 350kg of acrylic acid, 180kg of maleic anhydride, 150kg of acrylonitrile and 250kg of calcium lignosulfonate, raise the temperature to 60°C, and slowly Add 200kg of hydrogen peroxide, control the adding speed, keep boiling slightly, stir and react for about 1 hour, and a yellow liquid is formed.

[0053] Note: Controlling the reaction temperature in this step is the key. If the reaction is too violent, the drop rate of hydrogen peroxide should be slowed down.

[0054] b. Complexation reaction

[0055] Cool the reaction solution to about 50°C, add 150kg of ferrous sulfate and 115kg of zirconium oxychloride to the reaction kettle, and use f...

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Abstract

The invention discloses a high temperature resistant and compound salt resistant viscosity reduction agent for a drilling fluid and a preparation method thereof. Modified lignin and an acrylic monomer are subjected to copolymerization, sulfonation, oxidation and complexation reactions to obtain a product. In a high temperature deep drilling process, the colloidal stability of the high-density andhigh-solid drilling fluid can be obviously improved, the rheology of the drilling fluid is improved, the used amount is few, the cost is low, the duration for the drilling fluid is long, the maintenance workload is few, and the viscosity reduction agent is innoxious and non-polluting, and can be innoxiously decomposed in an natural environment.

Description

technical field [0001] The invention relates to a high temperature and anti-compound salt viscosity reducer for drilling fluid and a preparation method thereof. Background technique [0002] Deep well high-density water-based drilling fluids tend to thicken, gel, or even solidify under high-temperature wellbore conditions, resulting in out-of-control rheological properties of drilling fluids and severely restricting safe, high-quality, and efficient drilling in deep wells. The main reason for the high-temperature thickening of water-based drilling fluid is that the high-temperature degradation of the drilling fluid treatment agent and the high-temperature dehydration of the clay particles lead to a decrease in the colloidal stability of the clay particles, resulting in flocculation or coalescence of the clay particles; in addition, when the drilling fluid encounters In saline layer, salt rock layer and salt gypsum layer, inorganic electrolytes such as salt and calcium invade...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F289/00C08F220/06C08F220/46C08F222/06C08F8/06C08F8/32C09K8/035
Inventor 王富华王瑞和王力王成文
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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