A kind of clay anti-swelling agent
A technology of anti-swelling agent and clay, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of short validity period, poor anti-swelling effect, clogging of pores and channels, etc., and achieves simple preparation method, convenient operation, Good effect of anti-expansion performance
Active Publication Date: 2018-05-01
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Most of the organoclay stabilizers currently used are straight-chain type. When the molecular weight is large, it is easy to block the pores of medium and low permeability formations. When the molecular weight is small, the anti-swelling effect is poor and the validity period is short.
[0007] Although the existing clay stabilizers have the ability of temperature resistance and clay stabilization to a certain extent, they have deficiencies in high temperature resistance, salt resistance, long-term performance and use in medium and low permeability reservoirs
Method used
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Effect test
Embodiment 1
[0017] Weigh 40.0g of diethyldiallylammonium chloride, 5.0g of butanediol, 5.0g of potassium formate, and 50.0g of water into the reaction kettle and stir evenly to obtain a clay antiswelling agent.
Embodiment 2
[0019] Weigh 35.0g of triethylallyl ammonium chloride, 2.0g of glycerol, 8.0g of potassium formate, and 55.0g of water into a reaction kettle and stir evenly to obtain a clay antiswelling agent.
Embodiment 3
[0021] Weigh 25.0g of tetramethylammonium chloride, 15g of glycerol, 10.0g of potassium formate, and 50.0g of water into a reaction kettle and stir evenly to obtain a clay anti-swelling agent.
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The invention discloses a clay anti-swelling agent. The clay anti-swelling agent mainly contains three types of substances: ammonium salt, polyhydric alcohol and potassium formate. The mass percentage of each component is: ammonium salt: 20-60.0%; polyol: 2.0-30.0%; potassium formate: 2.0-10%; the balance is water. The clay anti-swelling agent has excellent temperature resistance and anti-swelling performance, and is suitable for low-permeability reservoirs.
Description
technical field [0001] The patent belongs to the technical field of petroleum engineering and relates to a clay antiswelling agent. Background technique [0002] Clay minerals widely exist in oil reservoirs, and 97% of the oil reservoirs in the world contain clay minerals to varying degrees. Usually when the reservoir contains 5% to 20% clay, it is considered to be an oil layer with higher clay content. If improper measures are taken during the development process, clay minerals will expand, disperse, and migrate, thereby blocking the throat of the formation pore structure, reducing the permeability of the formation, and causing formation damage, especially for low-permeability reservoirs. In order to reduce the damage to the reservoir, clay stabilizers are often added in oilfields to improve the hydration expansion and dispersion migration of clay. [0003] According to different chemical structures, clay stabilizers can be divided into: inorganic salts, inorganic multi-c...
Claims
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IPC IPC(8): C09K8/035
Inventor 封心领袁俊秀王康逯贵广
Owner CHINA PETROLEUM & CHEM CORP