Efficient anti-swelling swelled shrinkage agent for stratum treatment

A treatment agent and anti-swelling technology, which is applied in the field of high-efficiency anti-swelling and shrinking-swelling formation treatment agents, can solve the problems of short validity period and poor anti-swelling effect, and achieve the effects of inhibiting clay expansion, reducing interfacial tension, and preventing water lock phenomenon

Inactive Publication Date: 2017-05-17
天津民旌科技发展有限公司
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AI Technical Summary

Problems solved by technology

Small cationic polymers overcome the shortcomings of large cationic polymers, and are better used in low-permeability oilfields, but have poor anti-swelling effects and short validity periods

Method used

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  • Efficient anti-swelling swelled shrinkage agent for stratum treatment
  • Efficient anti-swelling swelled shrinkage agent for stratum treatment

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A high-efficiency anti-swelling and shrinking-swelling formation treatment agent, the preparation method of which comprises the following steps:

[0020] (1) Synthetic small molecule quaternary ammonium salt cationic polymer: in the first reactor, add each component of following percentage by weight (accounting for small molecule quaternary ammonium salt cationic polymer gross weight): 10% dehydrated alcohol, 20% triethylamine, 3% concentrated hydrochloric acid, 2% acetic acid, 15% epichlorohydrin, and the rest of water, stir evenly, slowly heat to 70°C, and react for 5 hours to prepare a small molecule quaternary ammonium salt cationic polymerization things.

[0021] (2) composite organic polymer: in the second reactor, add each component of following percentage by weight (accounting for organic polymer gross weight): the small molecular quaternary ammonium salt cationic polymer synthesized by 40% step (1), and 60% polyethylene glycol 400 (produced by Tianjin Zhonghe ...

Embodiment 2

[0024] A high-efficiency anti-swelling and shrinking-swelling formation treatment agent, the preparation method of which comprises the following steps:

[0025] (1) Synthetic of small molecule quaternary ammonium salt cationic polymer: in the first reactor, add each component of following percentage by weight (accounting for small molecule quaternary ammonium salt cationic polymer gross weight): 20% dehydrated alcohol, 30% % of triethylamine, 8% of concentrated hydrochloric acid, 5% of acetic acid, 25% of epichlorohydrin, and the rest of water, stir evenly, slowly heat to 70°C, and react for 5 hours to prepare small molecule quaternary ammonium salt cations polymer.

[0026] (2) composite organic polymer: in the second reactor, add each component of following percentage by weight (accounting for organic polymer gross weight): the small molecular quaternary ammonium salt cationic polymer synthesized by 60% step (1), And 40% polyethylene glycol 400 (produced by Tianjin Zhonghe ...

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Abstract

The invention provides an efficient anti-swelling swelled shrinkage agent for stratum treatment. The efficient anti-swelling swelled shrinkage agent for stratum treatment is prepared from the following substances (by weight): 30-55% of an organic polymer, 8-20% of inorganic salt, 2-8% of a fluorocarbon surfactant and the rest of water. The sum of weight percentages of the above substances is 100%. The prepared efficient anti-swelling swelled shrinkage agent for stratum treatment has strong adsorption capacity, good anti-swelling effect and scouring resistance. By the use of the fluorocarbon surfactant, interfacial tension can be reduced, capillary of an oil layer can be effectively dredged, and water locking phenomenon can be prevented. The product can be resistant to high temperature of 300 DEG C, can adapt to the anti-swelling process of low-permeability oil reservoir and has an excellent anti-swelling effect on oil reservoir with abnormal water sensitivity and velocity sensitivity.

Description

technical field [0001] The invention relates to the field of anti-expansion and shrinkage agents, in particular to a high-efficiency anti-expansion and contraction-expansion formation treatment agent. Background technique [0002] Different from onshore oilfields, offshore oilfield platforms have narrow space, and the working space of platforms is generally 100m 2 Left and right, if the platform drills new wells or checks pumps, other operational measures can no longer be implemented. In addition, the injection water quality of each water injection well has defects such as ①excessive oil content; ②excessive suspended solids; ③excessive mechanical impurities and particle diameter; ④serious scaling caused by incompatibility of various water injection and formation water, resulting in an increase in injection pressure , when it is close to the fracture pressure of the formation, the injection rate must be reduced, thus affecting the effect of water injection development. For ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C08G65/24C08G65/26
CPCC09K8/035C08G65/24C08G65/2624C09K2208/12
Inventor 高超夏自鸣许建军苏毅赵德喜马兆峰
Owner 天津民旌科技发展有限公司
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