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A controllable gel plugging agent

A plugging agent and gelling technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of limited application, thixotropic performance of plugging agent, water immersion resistance plugging strength and poor retention capacity and other problems, to achieve good plugging effect, good water blocking effect and good thixotropic performance

Active Publication Date: 2020-04-14
中石化石油工程技术服务有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thixotropic performance, water immersion resistance, plugging strength and poor retention capacity of this plugging agent limit its wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The raw materials for the preparation of the controllable gelling plugging agent provided by the invention include a gel material prepared from sulphoaluminate cement and sodium dodecylsulfonate. In an embodiment of the present invention, the alkalinity coefficient Cm of the sulphoaluminate cement is 0.95-0.98. In the embodiment of the present invention, the aluminum-sulfur ratio of the sulphoaluminate cement is P3 of the sulphoaluminate cement. The present invention has no special limitation on the source of the sulfoaluminate cement, which can be purchased from the market, for example, the H-DL type sulfoaluminate cement provided by Sichuan Jiahua Special Cement Co., Ltd. can be used.

[0024] In the present invention, the gel material is prepared from sulfoaluminate cement and sodium dodecylsulfonate, and the gel material is sulfoaluminate with sulfonic acid groups. In an embodiment of the present invention, the mass ratio of the sulphoaluminate cement and sodium do...

Embodiment 1

[0041] 2000g of sulphoaluminate cement and 5g of sodium dodecylsulfonate were reacted at 50°C for 1 hour to obtain a gel material;

[0042] 60g of distilled water, 15g of acrylamide, 0.1g of sodium dichromate, 0.1g of benzoyl peroxide and 24.8g of titanium chelate cross-linking agent were reacted at 70°C for 2.5 hours to obtain a thixotropic tone coagulant;

[0043] Mix 100g of gel material, 88g of thixotropic coagulant, 3g of polypropylene fiber, 3g of polyacrylamide stabilizer, 2g of cement and 1g of silicone water repellent at 25°C for 1.5 hours and mix well. A controllable gelling plugging agent is obtained.

[0044] The controllable gel plugging agent prepared in Example 1 of the present invention is suitable for use at 30°C to 50°C.

[0045] Mix 500g of the controllable gelling plugging agent prepared in Example 1 of the present invention with 365g of clear water to obtain the first plugging slurry, and test the preparation in Example 1 of the present invention accordi...

Embodiment 2

[0053] 2000g of sulphoaluminate cement and 2.0g of sodium dodecylsulfonate were reacted at 50°C for 1 hour to obtain a gel material;

[0054] 40g of distilled water, 25g of acrylamide, 0.3g of sodium dichromate, 0.3g of N,N-dimethylaniline and 35g of titanium chelate cross-linking agent were reacted at 70°C for 2.5 hours to obtain Thixotropic coagulant;

[0055] Mix 100g of gel material, 80g of thixotropic coagulant, 5g of polypropylene fiber, 5g of polyacrylamide stabilizer, 4g of cement and 3g of silicone water repellent at 25°C for 1.5 hours and mix well. A controllable gelling plugging agent is obtained.

[0056] The controllable gel plugging agent prepared in Example 2 of the present invention is suitable for use at 60°C to 80°C.

[0057] Mix 500g of the controllable gelling plugging agent prepared in Example 2 of the present invention with 365g of clear water to obtain the first plugging slurry, and test the preparation in Example 2 of the present invention according t...

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Abstract

The invention provides a controllable gelatinization leak-stopping agent, which is made from materials including a gel material, a thixotropic adjusting retarder, polypropylene fibers, a polyacrylamide stabilizer, a cementing agent and a water repellent. The gel material is made from sulphoaluminate cement and sodium dodecanesulphonate and sodium dodecanesulphonate, and the thixotropic adjusting retarder is made from water, acrylamide, organic chromium salt, an initiator and a cross-linking agent. The provided controllable gelatinization leak-stopping agent adopts a sulfonic-group-containing sulphoaluminate gel material and an organic chromium thixotropic adjusting retarder, and through cooperation with polypropylene fibers, the polyacrylamide stabilizer, the cementing agent and the water repellent, the leak-stopping agent is excellent in thixotropic property, water leaking resistance, plugging strength and retention performance. The provided controllable gelatinization leak-stopping agent fits to the temperature of 30-80 DEG C, the setting time is controllable, and the solid strength can be fast developed.

Description

technical field [0001] The invention relates to the technical field of drilling fluid treatment agents, in particular to a controllable gelling plugging agent. Background technique [0002] With the development of shale gas in my country, more and more large fractures and karst-cavity complex leakage formations are drilled, especially in areas such as Fuling Reef Dam and Yibin in Chongqing, where marine shale gas has been developed on a large scale. During the drilling process in these areas Malignant leaks of karst caves and fractures are ubiquitous from the drilling surface to the completion of drilling. During drilling construction, the drilling fluid can only go in and out. The drilling fluid leakage is generally thousands of cubic meters, and in severe cases tens of thousands of square meters, resulting in huge economic losses. Become one of the difficult problems of drilling. [0003] At present, the technologies for dealing with large fractures and cave-type leakage ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467C04B28/06
CPCC04B28/06C04B2111/00724C09K8/467C04B24/16C04B24/12C04B24/04C04B2103/0068C04B16/0633C04B24/2652C04B2103/65
Inventor 李韶利陈道元任文亮马小龙刘华俊郭子文姚志翔田亚芳
Owner 中石化石油工程技术服务有限公司