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Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir

A technology for oil and gas reservoirs and drilling fluids, which is applied in the field of low-toxicity oil-based microbubble drilling fluids to protect oil and gas reservoirs, and can solve problems such as high base fluid density, limited application, and impact on drilling fluid stability

Inactive Publication Date: 2015-11-25
CHINA PETROCHEMICAL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Water-based foams use the water phase as the continuous medium. Due to the high density of the base fluid, the reduction of the system density is limited by objective conditions. Especially in some low-pressure deep well areas, the stability of the drilling fluid is greatly affected.
[0004] (2) The stability of water-based foam is significantly damaged by highly mineralized water. In low-pressure, high-salt reservoirs with strong water sensitivity, shale hydration expansion is easily caused by foam rupture, which limits the application of this technology

Method used

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  • Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir
  • Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir
  • Low-toxicity oil base microbubble drilling fluid for protecting hydrocarbon reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Get 70 kilograms of white oil and 30 kilograms of distilled water, add 1 kilogram of sorbitan fatty acid ester emulsifier and 5 kilograms by the carbon number of the carbon chain in the long carbon chain alkyl quaternary ammonium salt by montmorillonite type clay mineral to be C12 modification The obtained organic bentonite was stirred for 20-30 minutes to form a base slurry; then 1 kg of oil-based foaming agent was added (mixed according to the long-chain alkyl fat calcium salt: alkyl silicone oil = 1:0.2 molar ratio) The resulting mixture) and 2 kg of butadiene rubber tackifier, fully stirred for 2-3 hours until the system is uniform.

Embodiment 2

[0095] Get 95 kilograms of white oil and 5 kilograms of distilled water, add 3 kilograms of sorbitan fatty acid ester emulsifiers and 2 kilograms by the carbon number of the carbon chain in the long carbon chain alkyl quaternary ammonium salt by montmorillonite clay mineral to be C12 modification The organobentonite that is obtained by mixing is stirred for 20-30 minutes to form a base slurry; then add 3 kg of oil-based foaming agent (mixed according to the long-chain alkyl fat calcium salt: alkyl silicone oil = 1:0.2 molar ratio) The resulting mixture) and 0.5 kg of butadiene rubber tackifier, fully stirred for 2-3 hours until the system is uniform.

Embodiment 3

[0097] Get 80 kilograms of white oil and 20 kilograms of distilled water, add 2 kilograms of sorbitan fatty acid ester emulsifiers and 3.5 kilograms by the carbon number of the carbon chain in the long carbon chain alkyl quaternary ammonium salt by montmorillonite type clay mineral to be C12 modification The organobentonite that is obtained by mixing is stirred for 20-30 minutes to form a base slurry; then add 2 kg of oil-based foaming agent (according to the long-chain alkyl fat calcium salt: alkyl silicone oil = 1:0.2 molar ratio mixed to form The resulting mixture) and 1 kg of butadiene rubber tackifier, fully stirred for 2-3 hours until the system is uniform.

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Abstract

The present invention discloses a low-toxicity oil base microbubble drilling fluid for protecting a hydrocarbon reservoir. The drilling fluid mainly comprises the following components in parts by weight: 70-95 parts of base oil, 5-30 parts of water, 1-3 parts of an oil base blowing agent, 2-5 parts of organic bentonite, 0.5-2 parts of a tackifier and 1-3 parts of an emulsifier. By adopting a technical solution of using a mixture of the oil base blowing agent, organic bentonite, the tackifier, the base oil, water and air to form oil base microbubbles, the existing problems in the prior art that lower density, limited degree, insufficient temperature and salt resistance capacity in an aqueous foaming system, and complex underground problems of leakage, hole shrinkage and tool jamming easily caused can be solved. The drilling fluid provided by the present invention can be applied to a drilling operation in a special and complex reservoir such as a low-pressure carbonate reservoir, a mud shale reservoir and the like, and has the advantages of low-toxicity and environmental protection.

Description

Technical field: [0001] The invention relates to a working fluid in oilfield drilling engineering, in particular to a low-toxicity oil-based microbubble drilling fluid with environmental protection characteristics that can be used in low-pressure and leaky formations to protect oil and gas layers. Background technique: [0002] For the drilling and development of low-pressure reservoirs, the most ideal drilling fluid is foam drilling fluid. As early as the 1950s, foreign countries realized that the foam has a low density and has a strong ability to remove and carry cuttings. The application of foam in the drilling process can increase the mechanical penetration rate, reduce the number of stuck pipes, and reduce the consumption of the drill bit and the required power. At present, conventional foam drilling fluids use the water phase as the continuous medium, and rely on the action of the foaming agent to reduce the density of the foam or micro-bubbles formed by mixing with ai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/38
Inventor 周辉严波郭保雨何兴华刘学英柴金鹏钟春姜春丽
Owner CHINA PETROCHEMICAL CORP
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