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Oil well cement paste self-healing agent suitable for acid gas pool

A technology for cementing cement slurry and acid gas, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of complicated use process, high cost, short application time, etc., achieve good thickening performance, increase densification Strong and practical effect

Active Publication Date: 2014-08-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above methods cannot fully meet the long-term cementing requirements of natural gas wells or gas storage wells, and have the following disadvantages: 1) they are not specifically for sour gas fields, and some methods suitable for oil wells may not be applicable to gas wells; 2) ) Self-healing materials have compatibility problems with cementing cement, and there is no guarantee that they will not undergo qualitative changes and become invalid in the downhole environment; 3) Self-healing components have a certain impact on the original performance of cement stone; 4) The application time is relatively long Short, durability has yet to be tested, and self-healing materials are difficult to meet the requirements of high temperature, high pressure, and rapid response; 5) High cost and complex use process
However, these materials that can undergo precipitation reactions are often not well compatible with cement-based materials, and cannot adapt to complex working conditions downhole, so there are limitations in use

Method used

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  • Oil well cement paste self-healing agent suitable for acid gas pool
  • Oil well cement paste self-healing agent suitable for acid gas pool
  • Oil well cement paste self-healing agent suitable for acid gas pool

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The parameters related to the preparation of cementing slurry self-healing agent suitable for sour gas reservoirs are as follows:

[0034] Mesh number of expanded perlite: 80 mesh.

[0035] Mass percentage of dilute hydrochloric acid: 5%.

[0036] Activation conditions of expanded perlite acid: 200r / min, 2h.

[0037] Expanded perlite modification conditions: the mass ratio of expanded perlite powder to cetyltrimethylammonium bromide is 1:10, the cationic surfactant solution is 0.5% by mass, stirred in a constant temperature water bath at 60°C for 2h, cooled to room temperature, filtered and separated, the expanded perlite was repeatedly washed with distilled water 5 times, and then dried at 150°C for 4 hours.

[0038] Prepare silver nitrate solution: the mass ratio of silver nitrate to water is 1:50, and stir at 1500r / min for 2h.

[0039] Prepare modified expanded perlite-silver nitrate solution: 10 g of modified expanded perlite powder, 500 mL of silver nitrate solu...

Embodiment 2

[0053] The parameters related to the preparation of cementing slurry self-healing agent suitable for sour gas reservoirs are as follows:

[0054] Mesh number of expanded perlite: 100 mesh.

[0055] Mass percentage of dilute hydrochloric acid: 10%.

[0056] Activation conditions of expanded perlite acid: 200r / min, 2h.

[0057] Expanded perlite modification conditions: the mass ratio of expanded perlite to cetyltrimethylammonium bromide is 1:15, the cationic surfactant solution is 0.5% by mass, stirred in a constant temperature water bath at 60°C for 2h, and cooled to At room temperature, separated by filtration, the expanded perlite was repeatedly washed 5 times with distilled water, and then dried at 150°C for 4 hours.

[0058] Prepare copper sulfate solution: the mass ratio of copper sulfate to water is 1:80, and stir at 1500r / min for 1.5h.

[0059] Prepare modified expanded perlite-copper sulfate solution: 10 g of modified expanded perlite powder, 500 mL of copper sulfate...

Embodiment 3

[0073] The parameters related to the preparation of cementing slurry self-healing agent suitable for sour gas reservoirs are as follows:

[0074] Mesh number of expanded perlite: 120 mesh.

[0075] Dilute hydrochloric acid mass percentage: 15%.

[0076] Activation conditions of expanded perlite acid: 200r / min, 2h.

[0077] Expanded perlite modification conditions: the mass ratio of expanded perlite to cetyltrimethylammonium bromide is 1:20, the cationic surfactant solution is 0.5% by mass, stirred in a constant temperature water bath at 60°C for 2h, and cooled to At room temperature, separated by filtration, the expanded perlite was repeatedly washed 5 times with distilled water, and then dried at 150°C for 4 hours.

[0078] Prepare lead acetate solution: lead acetate to water mass ratio is 1:100, stir at 1500r / min for 2h.

[0079] Prepare modified expanded perlite-lead acetate solution: 10g of modified expanded perlite powder, 500mL of lead acetate solution.

[0080] Adso...

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Abstract

The invention discloses an oil well cement paste self-healing agent suitable for an acid gas pool. The method for preparing the oil well cement paste self-healing agent suitable for the acid gas pool comprises the steps that (1) acid activation treatment and modification treatment are conducted on expanded perlite with the particle size ranging from 80 meshes to 120 meshes; (2) one or more of the self-healing materials such as copper sulfate, silver nitrate, barium hydroxide and lead acetate are mixed with water with the mass ratio of 1:50-100; (3) 10 g to 50 g of the modified expanded perlite is added to 200 mL to 1000 mL of a self-healing solution, so that a modified expanded perlite-seal-healing material mixed solution is prepared; (4) the mixed solution is placed in a spray dryer to be dried for two hours at the temperature of 250 DEGC to 300 DEG C, and then the oil well cement paste self-healing agent is obtained. The oil well cement paste self-healing agent can be adapted to the underground complicated working condition, is good in durability and temperature resistance, and capable of improving the mechanical property of set cement, the long-term sealing integration of acid gas well cement rings is guaranteed, and the production life of a gas well is prolonged.

Description

technical field [0001] The invention relates to a self-healing agent for gas well cementing slurry in sour gas reservoirs in oil and gas exploration and development, which can improve the mechanical properties of cement (rings), endow it with self-healing performance, and achieve the effect of automatic healing of micro-cracks. Background technique [0002] Sour gas reservoir means that the produced natural gas contains H 2 S, CO 2 Gas reservoirs with non-hydrocarbon gases and impurities such as mercaptans and sulfides. The sour gas fields in the world are mainly distributed in China, Canada, the United States, France, Russia, Iran and other countries, and are widely distributed. Such gas fields have been applied and developed on a large scale. In the process of gas well development and production, the cement stone (ring) needs to meet the technical requirements of long-term hydraulic sealing in the downhole. The system composed of formation-casing-cement ring should be ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467
CPCC04B14/185C04B22/06C04B22/14C04B24/04C09K8/467
Inventor 李明刘萌郭小阳李早元程小伟杨雨佳蒙飞刘健辜涛黄盛
Owner SOUTHWEST PETROLEUM UNIV
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