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Temporarily blocked high temperature kill fluid suitable for low permeability reservoir and preparation method thereof

A low-permeability, well-killing fluid technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of suspension stability of weighted materials, lack of clay-free high-temperature polymer filtrate reducers, etc. The effect of alleviating water resources dependence, low solid phase intrusion, and low cleaning requirements

Inactive Publication Date: 2017-03-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research and development of temporary plugging high-temperature and high-density well killing fluid system has the following difficulties: the suspension stability of aggravated materials, the lack of clay-free high-temperature polymer fluid loss reducer, the optimization of rigid particle size of temporary plugging agent and filling materials preferred

Method used

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  • Temporarily blocked high temperature kill fluid suitable for low permeability reservoir and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] Take 300 kilograms of fresh water, add 130 kilograms of calcium chloride, fully dissolve, then add 1.6 kilograms of diammonium quaternary ammonium salt, 0.1 kilograms of alkylphenol polyoxyethylene ether OP-10, 1.1 kilograms of sodium sulfite, after being dissolved, continue to add 0.1 1 kg of modified cellulose, 2.1 kg of high temperature resistant modified starch fluid loss reducer, 1 kg of sulfonated asphalt, 1.5 kg of siloxane polyoxyethylene ether, after fully stirring, add 3 kg of graded calcium carbonate , stir well.

Embodiment 2

[0038] Take 300 kilograms of fresh water, add 252 kilograms of calcium chloride, fully dissolve, then add 1.4 kilograms of diammonium quaternary ammonium salt, 0.15 kilograms of alkylphenol polyoxyethylene ether OP-10, 0.9 kilograms of sodium sulfite, after being dissolved, continue to add 0.3 1 kg of modified cellulose, 1.9 kg of high temperature resistant modified starch fluid loss reducer, 1.5 kg of sulfonated asphalt, 1 kg of siloxane polyoxyethylene ether, after fully stirring, add 5 kg of graded calcium carbonate , stir well.

Embodiment 3

[0040] Take 300 kilograms of fresh water, add 190 kilograms of calcium chloride, fully dissolve, then add 1.5 kilograms of diammonium quaternary ammonium salt, 0.12 kilograms of alkylphenol polyoxyethylene ether OP-10, 1.0 kilograms of sodium sulfite, after dissolving, continue to add 0.2 1 kg of modified cellulose, 2.0 kg of high temperature resistant modified starch fluid loss reducer, 1.2 kg of sulfonated asphalt, 1.2 kg of siloxane polyoxyethylene ether, after fully stirring, add 4 kg of graded calcium carbonate , stir well.

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Abstract

The invention provides a temporarily blocked high temperature kill fluid suitable for low permeability reservoir and preparation method thereof. The temporarily blocked high temperature kill fluid suitable for low permeability reservoir is composed of an inorganic salt liquid and additives, wherein the inorganic salt solution is composed of fresh water, calcium chloride and calcium bromide in mass distribution ratio of 300 to (130-252) to (0-120); the additive is composed of the raw materials in percentage by weight based on the inorganic salt liquid: 1.4-1.6% of a high temperature resistant corrosion inhibitor, 0.9-1.1% of a stabilizer, 0.1-0.15% of a surfactant, 1-1.5% of an ultra-low penetrant, 1.9-2.1% of a high temperature resistant modified starch type filtrate reducer, 3-5% of a temporary blocking material, 0.1-0.3% of a temperature resistant tackifier and shear strength improving agent or 3-6% of an oligomerization type thickener, 1-1.5% of a liquid-state oil-soluble liquid temporarily blocking agent or 1-2% of low fluorescent sulfonated pitch.

Description

technical field [0001] The invention relates to a low-permeability reservoir with a density of 1.4g / cm 3 ~1.6g / cm 3 Temporary plugging type high temperature well killing fluid. Background technique [0002] Currently commonly used temporary plugging type well killing fluid is generally composed of base fluid (clear water or brine), viscosifier (polymer), bridging agent (acid-soluble, water-soluble and oil-soluble) and so on. Its advantages are: low filtrate and solid phase intrusion, low cleaning requirements for circulation lines, suitable for land oil fields where water intake is difficult, especially water-deficient oil fields. However, the research and development of temporary plugging high-temperature and high-density killing fluid system has the following difficulties: the suspension stability of aggravated materials, the lack of clay-free high-temperature polymer fluid loss reducers, the optimization of the rigid particle size of temporary plugging agents and fillin...

Claims

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Application Information

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IPC IPC(8): C09K8/514
CPCC09K8/5045C09K8/5086C09K8/514C09K2208/32
Inventor 杨景辉马素俊冯雷雷代兴益王娟宋志东张磊朱硕沛孙玉海黄维安
Owner CHINA PETROLEUM & CHEM CORP
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