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Temperature response type self-degradation temporary plugging agent and well repairing method

A temperature-responsive, self-degrading technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as complex process, large rubber plugs, complex and cumbersome construction process, etc.

Active Publication Date: 2021-07-30
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing liquid rubber stoppers also have the problem of difficulty in breaking the gel and degrading
Chinese patent CN105131917A discloses a degradable liquid rubber stopper, which consists of carboxymethyl guar gum, γ-aminopropyltriethoxysilane and cetyltrimethylammonium bromide. , it is necessary to pump ammonium persulfate solution into the wellbore to break the gel, and the construction process is complicated and cumbersome; Chinese patent CN106905940A discloses a medium-high density elastic liquid plug and a workover method. Only when the rubber plug breaks into elastic rubber plug particles can it be degraded, and then the saline well killing fluid is used for circulation flushing, the process is complex
If the damage of the rubber plug is uneven, it is easy to form a large rubber plug, which increases the difficulty of post-processing

Method used

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  • Temperature response type self-degradation temporary plugging agent and well repairing method
  • Temperature response type self-degradation temporary plugging agent and well repairing method
  • Temperature response type self-degradation temporary plugging agent and well repairing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] First, the mass fraction is 5 g of acrylamide, 0.3 g of polyethylene glycol 600 double acrylate, 0.5 g of ammonium sulfate, 0.25 g of AMP-95 in 93.95 ml of water formulated temperature response self-destructive temporary blocked agent; Aqueous solution of polyacrylamide having a mass fraction is 3 ‰ as a front liquid and a rear liquid.

[0046] In the 2000 mD permeability core (simulated oil and gas well), 10 ml of 3 ‰ polyacrylamide aqueous solution, 20 mL temperature response self-destructive susceptor, then injected 20 ml of 3 ‰ polyacrylamide aqueous solution and in real time to observe injecting pressure Changes, then the cores were added to 50 ° C, 60 ° C, 70 ° C, and the temperature resistance of the temporary blocker was tested in the thermostatic oven, and the experimental results are figure 1 As shown, the effect of temperature on temperature response self-deterioration suspicion gel time and the vaporization time is shown in Table 1, from figure 1 And Table 1, in...

Embodiment 2

[0050] First, 4 g of acrylamide, 0.1 g of polyethylene glycol 600 double acrylate, 0.2 g of ammonium sulfate, 0.25 g of AMP-95 in 95.45 ml of water is prepared in water; the formulation of mass fraction is 4 ‰ The aqueous acrylamide solution is used as the front liquid and the rear liquid.

[0051] In the 2000 md permeability core (simulated oil and gas well), 10 ml of 4 ‰ polyacrylamide aqueous solution, 20 ml temperature response self-destructive susceptor, 20 ml of 4 ‰ polyacrylamide aqueous solution, reacting at 60 ° C constant temperature oven after 4 h After the glue, after the rubber, the core is taken out in the replacement device to test the breakthrough pressure of the temporary blocker, and the experimental results are figure 2 As shown, the experimental results are known that the exclusion agent with water and gas reverse replacement of the core test is up to 5 MPa and 5.5 MPa, and the result is not large, and the curve has only one breakthrough point, indicating that ...

Embodiment 3

[0053] First, 4 g of acrylamide, 0.8 g of polyethylene glycol 600 double acrylate, 1 g of ammonium sulfate, 0.1 g, 0.2 g, 0.3 g, 0.4 g, 0.5 g of AMP-95 in water formulation temporary block The mass fraction of acrylamide in the dosage solution, the mass fraction of the acrylamide in the temporary agent solution is 4%, and the mass fraction of polyethylene glycol 600 double acrylate is 0.8%, the mass fraction of ammonium sulfate is 1%, and the mass fraction of AMP-95 is respectively. It is 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, and testing the effect of temperature response type self-deteriorating agent with the amount of temperature response type, the temporary blocker is carried out by the test. The observation record is indicated by the gel strength code method, and the experimental results are shown in Table 2, and the experimental results are known from the experimental results, at different degradation catalysts, the temperature responsive type self-deterioration The glue time is from...

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Abstract

The invention provides a temperature response type self-degradation temporary plugging agent and a well repairing method, and belongs to the technical field of oil and gas exploitation. The temperature response type self-degradation temporary plugging agent comprises the following components in percentage by mass: 4%-6% of an alkenyl-containing monomer, 0.1%-1% of a cross-linking agent, 0.1%-1% of an initiator, 0.05%-0.5% of a degradation catalyst and the balance of water, wherein the cross-linking agent is polyethylene glycol diacrylate, and the degradation catalyst is 2-amino-2-methyl-1-propanol or ethylene glycol amine. Polyethylene glycol diacrylate is used as a cross-linking agent, 2-amino-2-methyl-1-propanol or ethylene glycol amine is used as a degradation catalyst, the temporary plugging agent is gelatinized under the action of temperature, the strength is kept within a period of time, and then as time goes on, the polyethylene glycol diacrylate loses efficacy under the action of the degradation catalyst, the gel temporary plugging agent is degraded into a linear polymer, the final viscosity is reduced, and self-degradation of the gel is realized.

Description

Technical field [0001] The present invention relates to the field of oil and gas mining, in particular, to a temperature response type self-desleviation temporary blocker and a well-working method. Background technique [0002] In order to deal with the failure of the oil and gas well during the oil and gas mining, it is necessary to repair the operation to relieve the normal production operation. However, when the oil and gas well is operated, the pressure difference causes a loss of moles to different degrees of moles, which not only hinders the normal well-being, but also causes pollution to the formation. Therefore, how to take effective measures to achieve the temporary blocker of the wellbore, and will have an important practical significance after the completion of the work well. [0003] In recent years, liquid glue is studied and gradually used in oil and gas well operations. The gel temporary pressure well fluid is generally referred to as "liquid rubber plug", is the p...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/56C08F222/38C08F220/06C09K8/512C09K8/88
CPCC08F290/062C09K8/512C09K8/5083C09K8/887C09K8/882C08F220/56C08F222/385C08F220/06
Inventor 李强于小荣秦少雄杨欢苏高申艾柳强严涵刘冲
Owner YANGTZE UNIVERSITY
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