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Clay stabilizer and preparation method thereof

A clay stabilizer and solvent technology, applied in the field of clay stabilizer for water injection, can solve the problems of aggravating oilfield permeability damage, poor scour resistance, etc.

Active Publication Date: 2020-01-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

The initial anti-swelling rate of inorganic salt clay stabilizers is high, but the erosion resistance is poor, and its anti-swelling effect is only temporary; organic cationic clay stabilizers have long-term effects and can stabilize clay for a long time
However, for low-permeability oil layers, cationic polymers with relatively large molecular weights will aggravate the damage to oilfield permeability

Method used

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  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof
  • Clay stabilizer and preparation method thereof

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the embodiments of the accompanying drawings.

[0027] Preparation of clay stabilizer: Put pentaerythritol tetrachloroacetate and a certain amount of dried polar solvent into a three-necked flask, then add triethylamine to reflux and stir for a certain period of time, and use nitrogen protection during the reaction. After the reaction was completed, the product was centrifuged for 20 min, and the upper layer of yellow liquid was poured out. Rinse the product with anhydrous solvent several times, and carry out vacuum filtration under nitrogen protection. Finally, the obtained product was put into a vacuum drying oven, dried at 50° C., and set aside.

[0028] One, the following examples are used to study the preparation conditions:

[0029] 1 The impact of solvent type on product yield

[0030] Solvents with different polarities and different boiling points were selected to investigate the influe...

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Abstract

The invention discloses a clay stabilizer which is tetrachloride pentaerythritol tetra(triethylamine) acetate obtained through reaction of pentaerythritol chloracetate and triethylamine. The invention further discloses a preparation method of the clay stabilizer correspondingly. The clay stabilizer has the advantages of simple synthesis method, high synthesis yield, good anti-expansion effect and high scouring resistance.

Description

technical field [0001] The invention relates to a clay stabilizer for water injection in oil exploitation. Background technique [0002] At present, my country's oil production is mostly developed by water flooding. The clay minerals in the formation will expand and disperse when they encounter water-based substances during the oilfield production process, resulting in a decrease in the permeability of the reservoir and damage to the oil and gas reservoir. In order to protect the permeability of oil and gas layers, clay stabilizers are added to various water-based working fluids, which can effectively inhibit the damage of clay to oil and gas layers. The cations electrolyzed by the clay stabilizer in the water-based material can be adsorbed on the surface of clay particles through electrostatic action to reduce the negative charge of clay particles, and can also be wrapped on the surface of clay particles to inhibit clay swelling. [0003] Clay stabilizers commonly used in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C229/12C07C227/08C09K8/035
CPCC07C227/08C07C229/12C09K8/035C09K2208/12
Inventor 姜翠玉马怡然梁书源黄立贤王芳珠宋林花
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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