High temperature resistant oil-in-water drilling fluid

An oil-in-water drilling fluid with high temperature resistance technology, applied in the field of petroleum drilling, can solve the problems of high density, difficulty in meeting the needs of underbalanced drilling, and insufficient temperature resistance, and achieve good rheology, fluid loss, and strong inhibition and anti-pollution effect

Active Publication Date: 2014-11-12
CHINA PETROLEUM & CHEM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the content of the present invention is to overcome the lack of temperature resistance and density higher than 0.9g / cm of the existing oil-in-water drilling fluid 3 , it is difficult to meet the defects of underbalanced drilling needs, providing a high temperature resistant oil-in-water drilling fluid

Method used

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  • High temperature resistant oil-in-water drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

preparation example A1

[0022] raw material

[0023] The above-mentioned 2-methyl-2-acrylic acid oxypropylsulfonic acid, acrylamide, acrylic acid and 2-hydroxyl-3-methacryloyloxypropyltrimethylammonium chloride are formulated into aqueous solution at room temperature, and hydrogen Adjust the pH value of the aqueous solution to 9.0 with sodium oxide, then add ammonium persulfate and sodium bisulfite to initiate polymerization. The initial temperature of the polymerization reaction is 20°C, and the polymerization time is 5 minutes. After the polymerization reaction, the product is granulated and dried , Pulverized to obtain temperature and salt fluid loss reducer A1.

preparation example A2

[0025] raw material

[0026] The above-mentioned 2-methyl-2-acrylic acid oxypropylsulfonic acid, acrylamide, acrylic acid and 2-hydroxyl-3-methacryloyloxypropyltrimethylammonium chloride are formulated into aqueous solution at room temperature, and hydrogen Adjust the pH value of the aqueous solution to 11.0 with sodium oxide, then add ammonium persulfate and sodium bisulfite to initiate polymerization. The initial temperature of the polymerization reaction is 50°C, and the polymerization time is 20 minutes. After the polymerization reaction, the product is granulated and dried , and pulverize to obtain the temperature-resistant and salt-resistant fluid loss reducer A2.

preparation example A3

[0029] The above-mentioned 2-methyl-2-acrylic acid oxypropylsulfonic acid, acrylamide, acrylic acid and 2-hydroxyl-3-methacryloyloxypropyltrimethylammonium chloride are formulated into aqueous solution at room temperature, and hydrogen Sodium oxide adjusts the pH value of the aqueous solution to 10.0, and then adds ammonium persulfate and sodium bisulfite to initiate polymerization. The initial temperature of the polymerization reaction is 30°C, and the polymerization time is 30 minutes. After the polymerization reaction, the product is granulated and dried , and pulverize to obtain the temperature-resistant and salt-resistant fluid loss reducer A3.

[0030] (2) Anti-high temperature emulsifier C

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Abstract

The invention discloses a high temperature resistant oil-in-water drilling fluid, which is realized through the following technical scheme of: (1) by mass, mixing 3.0%-4.0% of sodium bentonite, 0.2%-0.5% of NaOH, 0.1%-0.3% of a temperature and salt resistant filtrate reducer A, 0.2%-0.5% of a carboxymethylcellulose sodium salt, 2.0%-3.0% of sulfonated phenolic resin, 0.8%-2.0% of sulfonated lignite, 0.05%-0.15% of a high temperature stabilizer B, 1.0%-3.0% of an anti-high temperature emulsifier C, 3%-7% of KCl, 2%-5% of asphalt, and the balance water to obtain an aqueous phase; (2) mixing the aqueous phase obtained in step (1) with diesel oil or white oil according to a volume percentage of 7:3, 6:4, 5:5, 4:6 and 3:7 and performing emulsification, and then carrying out high temperature aging to obtain the high temperature resistant oil-in-water drilling fluid. The formed high temperature resistant oil-in-water drilling fluid has temperature resistance up to 180DEG C and a lowest density of 0.88g / cm<3>, can effectively prevent formation leakage of low pressure depleted oil and gas zones, is conducive to enhancement of the productivity of oil-gas wells, and is suitable for the technical field of petroleum drilling and development of low pressure oil and gas reservoirs.

Description

Technical field: [0001] The invention relates to a high-temperature resistant oil-in-water drilling fluid, in particular to a drilling fluid used in the drilling process of a low-pressure leaky formation, and belongs to the field of petroleum drilling. Background technique: [0002] In recent years, with the continuous deepening of oil and gas exploration and development, downhole complex situations such as lost circulation, well collapse, and well kick are prone to occur in low-pressure formations during the actual drilling process. Therefore, underbalanced drilling technology has been more and more applied. Drilling fluid is used in underbalanced drilling in this type of formation because of its stable density, convenient construction, and high safety. It has become one of the key technologies for underbalanced drilling in deep wells. It has played an important role in reducing lost circulation in depleted reservoirs. As my country's exploration and development move towar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/28C08F220/56C08F220/06C08F220/38C08F220/36
CPCC09K8/265
Inventor 马文英史沛谦孙举刘彬卢国林钟灵万龙
Owner CHINA PETROLEUM & CHEM CORP
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