Preparation method of high-temperature-resistant high-strength plugging agent for plugging oil and gas wells

A high-temperature-resistant and high-strength technology, used in the preparation of high-strength CANSEAL plugging agents, high-temperature resistance for leakage plugging, and water plugging in oil and gas wells. and other problems to achieve the effect of low viscosity

Active Publication Date: 2020-11-13
山东科兴化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the deficiencies of the conventional cement systems for water plugging and leak plugging in existing oil and gas wells, such as low compressive strength, poor cementation with casing, poor t...

Method used

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  • Preparation method of high-temperature-resistant high-strength plugging agent for plugging oil and gas wells

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preparation example Construction

[0033] A method for preparing a high-temperature-resistant high-strength plugging agent for leak plugging and water plugging in oil and gas wells, comprising the following steps:

[0034] (1) Stir the polyoxymethylene and amine source at a molar ratio of 2.0: (0.9-1.1), then add the phenolic source at a molar ratio of phenolic hydroxyl group to amine group (0.8-1.1): 1.0, and reflux reaction at low temperature React for 6-10 hours. After the reaction, the product is washed with alkaline solution for 5-6 times, and then washed with deionized water to neutrality to obtain a low-viscosity, pure liquid main agent; the product has good fluidity, so that it can be easily pumped downhole Layers of water blocking and leak blocking;

[0035] The amine source can be selected from any one of diphenylmethanediamine, aniline, polyetheramine, allylamine, and 3-ethynylaniline or a combination of two or more. The phenol source can be selected from any one or combination of two or more of bi...

Embodiment 1

[0041] A method for preparing a high-temperature-resistant high-strength plugging agent for water and leakage plugging in oil and gas wells, comprising the following steps:

[0042] (1) Stir the polyoxymethylene and amine source at a molar ratio of 2.0: (0.9-1.1), then add the phenolic source at a molar ratio of phenolic hydroxyl group to amine group (0.8-1.1): 1.0, and reflux for 6-10 hour; after the reaction finishes, the product is washed 5-6 times with 30% sodium hydroxide aqueous solution alkali, and then washed to neutrality with deionized water to obtain low viscosity, pure liquid main agent; this product has good fluidity, making It can be easily pumped to the downhole water plugging and leak plugging intervals;

[0043] The amine source can be selected from any one of diphenylmethanediamine, aniline, polyetheramine, allylamine, and 3-ethynylaniline or a combination of two or more. The phenol source can be selected from any one or combination of two or more of bisphen...

Embodiment 2

[0049] A method for preparing a high-temperature-resistant high-strength plugging agent for water and leakage plugging in oil and gas wells, comprising the following steps:

[0050] (1) Stir the polyoxymethylene and amine source at a molar ratio of 2.0: (0.9-1.1), then add the phenolic source at a molar ratio of phenolic hydroxyl group to amine group (0.8-1.1): 1.0, and reflux for 6-10 hour; after the reaction finishes, the product is washed 5-6 times with 30% sodium hydroxide aqueous solution alkali, and then washed to neutrality with deionized water to obtain low viscosity, pure liquid main agent; this product has good fluidity, making It can be easily pumped to the downhole water plugging and leak plugging intervals;

[0051] The amine source can be selected from any one of diphenylmethanediamine, aniline, polyetheramine, allylamine, and 3-ethynylaniline or a combination of two or more. The phenol source can be selected from any one or combination of two or more of bisphen...

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Abstract

The invention relates to the engineering fields of drilling plugging, casing damage well plugging, plugging pipe channeling, production well water plugging and the like in the oil and gas field development process, and particularly discloses a preparation method of a high-temperature-resistant high-strength plugging agent for oil and gas well water plugging. The method specifically comprises the following steps: synthesizing a main agent of the low-viscosity liquid plugging agent, namely uniformly stirring and adding a special polymer and a curing agent into the main agent according to a massratio of 1: (1.0-3.0) by taking a product obtained by reflux reaction, alkali washing and deionized water washing of a polyformaldehyde amine source and a phenol source as the main agent, then addingan accelerant and a surfactant, and uniformly stirring and dissolving. The prepared mixed solution is cured to obtain the plugging material with excellent pressure resistance and cementing casing performance, the glass-transition temperature of the plugging material exceeds 200 DEG C, and the compressive strength is 100 MPa or above.

Description

technical field [0001] The invention relates to engineering fields such as drilling leak plugging, casing damaged well plugging, plugging pipe escape, production well water plugging and other engineering fields in the development process of oil and gas fields, and specifically discloses a water plugging and leak plugging oil and gas well with high temperature resistance and high strength. The preparation method of CANSEAL blocking agent. Background technique [0002] The number of casing damaged wells in domestic oilfields continues to increase every year, the downhole technical conditions continue to deteriorate, and the out-of-control reserves increase, seriously affecting the production of mature oilfields. Conventional leak plugging and water plugging use cementing cement system. After plugging, the pressure test strength is only 8-10MPa, and the validity period is only 3-5 months. After the plugging fails, repeated plugging is required, which not only causes economic lo...

Claims

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Application Information

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IPC IPC(8): C09K8/44C08G14/06
CPCC08G14/06C09K8/426C09K8/44
Inventor 李振华崔长海卡杰特·瓦列里·弗拉基米尔维奇李宇超崔浩杨建峰
Owner 山东科兴化工有限责任公司
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