Coating agent for water-based drilling fluid

A technology of water-based drilling fluid and coating agent, which is applied in the directions of drilling compositions, chemical instruments and methods, etc., can solve problems such as the inability to meet the requirements of on-site construction.

Inactive Publication Date: 2016-02-03
天津滨海新区普瑞德石油科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional coating agents in the prior art can no

Method used

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  • Coating agent for water-based drilling fluid

Examples

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Example Embodiment

[0014] Example 1 Preparation of coating agent for water-based drilling fluid

[0015] The preparation method is as follows:

[0016] At room temperature, open the stirring tank and stir, add 1000kg of liquid polyacrylamide, 200kg AMPS and 180kg of N-methylpyrrolidone. After stirring, slowly add 80kg of soda ash, and the speed is controlled within 30min. Add 200kg of co-solvent (urea). Heat up and stir, and the temperature is controlled at 30~35℃; after visually inspecting that the materials are all dissolved, stir the dissolved materials at a constant temperature, turn on the cooling water to cool down, and control the temperature between 20~25℃ and stir for 30min; pass the stirred materials through the air The compressor is pressed into the polymerization vessel, and after nitrogen is filled for 10 minutes, 2 kg of sodium bisulfite is added, nitrogen is continued for 10 minutes, and 2 kg of hydrogen peroxide is added. After refilling with nitrogen for 10 minutes, close the nitrog...

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Abstract

The invention discloses a coating agent for a water-based drilling fluid. The coating agent is prepared from the following raw materials in parts by weight: 900-1100 parts of liquid polyacrylamide, 180-220 parts of AMPS, 170-190 parts of 1-methyl-2-pyrrolidinone, 75-85 parts of sodium carbonate, 180-220 parts of a co-solvent, 1.5-2.5 parts of sodium bisulfite and 1.5-2.5 parts of hydrogen peroxide. The coating agent can be added into the drilling fluid for controlling the filtration vector, and can be used in a salt water drilling fluid system for key control of the apparent viscosity, the plastic viscosity, the filtration vector and the like; drillings can be effectively coated by the coating agent, so as to protect the drillings and shale from hydration, protect a well wall from collapse, facilitate the stability of the well wall, and improve the drilling speed; meanwhile, the coating agent is capable of resisting high temperature, calcium, magnesium and salinity, has the characteristic of being good in filtrate loss effect, and is applicable to fresh water, sea water and saturated salt water slurry systems.

Description

technical field [0001] The invention relates to a coating agent for water-based drilling fluid. Background technique [0002] The coating agent is an important additive used in the drilling fluid system, which can effectively coat the cuttings, prevent the hydration of the cuttings and shale, prevent the collapse of the borehole wall, help the stability of the borehole wall, and increase the drilling speed. It has the functions of reducing water loss, improving flow pattern and increasing lubricity. [0003] At present, polyacrylic polymer coating agent PAC141, zwitterionic polymer coating agent FA367 and polyacrylamide potassium coating agent K-PAM have been developed and used at home and abroad. It has shown good performance in the system and improved the rheology of the drilling fluid system, but it also showed some shortcomings in the field use process, such as: only suitable for a specific drilling fluid system, such as the main application of PAC141 It is suitable fo...

Claims

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Application Information

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IPC IPC(8): C08F265/10C08F220/58C09K8/035
Inventor 周永
Owner 天津滨海新区普瑞德石油科技有限公司
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