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A cementitious gel plugging agent and preparation method thereof

A cementitious and gel technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of secondary leakage, loose plugging layer, poor temperature resistance, etc., to improve temperature resistance and firmness. blocking effect

Inactive Publication Date: 2016-09-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the content of the present invention is to overcome the disadvantages of poor temperature resistance existing in the above-mentioned existing lost circulation agents, and easily cause secondary leakage when the pressure is excited, the fracture expands, and the plugging layer becomes loose, and provides a A cementitious gel material for drilling plugging that can further undergo polycondensation reaction, has a cementation effect, and has an adjustable curing time, and its preparation method

Method used

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  • A cementitious gel plugging agent and preparation method thereof
  • A cementitious gel plugging agent and preparation method thereof
  • A cementitious gel plugging agent and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0021] 42 parts of sulfonated melamine, 15.75 parts of acrylamide, 2.25 parts of dimethyl diallyl ammonium chloride (cationic monomer), 0.011 parts of ammonium persulfate (initiator), 0.005 parts of sodium bisulfite (initiator) Mix with water; add 1.88 parts of hydrochloric acid to adjust the pH value to 7, add 0.94 parts of glacial acetic acid to adjust the pH value to 4, and polymerize in a water bath at 35°C for 15 minutes to obtain a polymer solution with a certain viscosity. Add 1.93 parts of NaOH to adjust the pH value to 9, polymerize at 75°C for 7 hours, take it out and cool it, and obtain a cementitious gel plugging material.

[0022] figure 1 It is the stress-strain diagram of the cementing plugging material prepared in Example 1 continuing to react in an oil bath at 100°C for different times. It can be seen from the figure that the stress required for the same strain to occur in the present invention increases with the prolongation of the reaction time. As the valu...

Embodiment 2

[0025] Mix 36 parts of sulfonated melamine, 22.8 parts of acrylamide, 1.2 parts of trimethylallyl ammonium chloride (cationic monomer), 0.015 parts of ammonium persulfate (initiator), 0.008 parts of sodium sulfite (initiator) and water ;Add 1.88 parts of hydrochloric acid to adjust the pH value to 7, add 0.94 parts of glacial acetic acid to adjust the pH value to 4, and polymerize in a water bath at 35°C for 15 minutes to obtain a polymer solution with a certain viscosity. Add 3.24 parts of Adjust the pH value to 12 with NaOH, polymerize at 60°C for 10 hours, take it out and cool it, and obtain a cementitious gel plugging material.

[0026] Other specific examples 3-8 were prepared according to the components given in Table 1.

[0027] Table 1 A kind of cementing gel plugging agent embodiment (unit is by mass percentage)

[0028]

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Abstract

The invention discloses a cementitious gel plugging agent and a preparation method thereof, which belong to the technical field of oilfield chemistry, and are polycondensed and synthesized by sulfonated melamine, hydrophilic monomers, cationic monomers, initiators, pH regulators and water. Obtained by copolymerization reaction, the beneficial effect is the introduction of the heat-resistant triazine ring heterocyclic structure contained in sulfonated melamine, which improves the temperature resistance, and the cementitious plugging material contains a large number of hydroxyl groups, carboxyl groups, amino groups, etc. Active groups, which can further react at formation temperature, have a cementing effect and can form a stronger plug.

Description

technical field [0001] The invention discloses a cementing gel plugging agent and a preparation method of the cementing gel plugging agent, which belongs to the technical field of oil field chemistry. technical background [0002] With the continuous improvement of drilling technology, the plugging technology has also made great progress, and the varieties of plugging materials are constantly increasing. Due to its good deformability, the gel material can be adjusted in shape according to the size of the leakage channel. When it encounters water, it will swell when it absorbs water, swells but does not dissolve, and has the function of filling and blocking after swelling. effect. [0003] The main chain of the currently researched gel plugging material is basically composed of carbon-carbon chains, and its temperature resistance is very limited. In the case of leakage in high-temperature formations, due to the high-temperature degradation of the gel plugging material, it ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F220/34C08F216/36C08F8/34C09K8/42
Inventor 李娟王中华胡群爱郭建华孙举周亚贤刘文堂刘晓燕
Owner CHINA PETROLEUM & CHEM CORP
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