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Degradable rubber plug liquid, and method for sealing layer by using degradable rubber plug liquid

A rubber stopper and resin matrix technology, which is applied in the field of degradable rubber stopper liquid and sealing layer using degradable rubber stopper liquid, can solve the problems of long breaking time and corrosion

Inactive Publication Date: 2021-07-13
LINGNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of liquid rubber plug uses epoxy resin as the matrix, and the cured rubber plug can be corroded by strong alkalis such as sodium hydroxide, but the gel breaking time is as long as 6 months

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of degradable rubber stopper liquid, forming the rubber stopper liquid comprises the following components by weight percentage:

[0023] Resin matrix 60%;

[0024] Comonomer 34%;

[0025] Curing agent 1%;

[0026] Shrinkage agent 5%;

[0027] In the present embodiment, the resin matrix is ​​diglycidyl itaconate;

[0028] In this embodiment, the comonomer is methyltetrahydrophthalic anhydride;

[0029] In this embodiment, the curing agent is boron trifluoride monoethylamine;

[0030] In this embodiment, the shrinkage agent is cellulose acetate;

[0031] A method for adopting a liquid seal layer of a degradable rubber stopper, comprising the steps of:

[0032] 1) Mix the degradable rubber plug liquid evenly at room temperature, pump 200L of the degradable rubber plug liquid into the wellbore, and use clean water to replace the rubber plug liquid to the target layer, and the temperature of the target layer is 150°C;

[0033] 2) Lift the oil pipe to separate t...

Embodiment 2

[0037] A kind of degradable rubber stopper liquid, forming the rubber stopper liquid comprises the following components by weight percentage:

[0038] Resin matrix 71%;

[0039] Comonomer 15%;

[0040] Curing agent 4%;

[0041] Shrinkage agent 10%;

[0042] In the present embodiment, the resin matrix is ​​diglycidyl itaconate;

[0043] In this embodiment, the comonomer is methyl hexahydrophthalic anhydride;

[0044] In the present embodiment, the curing agent is boron trifluoride ether;

[0045] In this embodiment, the shrinkage agent is nitrocellulose;

[0046] A method for adopting a liquid seal layer of a degradable rubber stopper, comprising the steps of:

[0047] 1) Mix the degradable rubber plug liquid evenly at room temperature, pump 100L of the degradable rubber plug liquid into the wellbore, and use clean water to replace the rubber plug liquid to the target layer, and the temperature of the target layer is 120°C;

[0048] 2) Lift the oil pipe to separate the o...

Embodiment 3

[0052] A kind of degradable rubber stopper liquid, forming the rubber stopper liquid comprises the following components by weight percentage:

[0053] Resin matrix 75%;

[0054] Comonomer 18%;

[0055] Curing agent 2%;

[0056] Shrinkage agent 5%;

[0057] In the present embodiment, the resin matrix is ​​diglycidyl itaconate;

[0058] In the present embodiment, the curing agent is methyltetrahydrophthalic anhydride;

[0059] In this embodiment, the curing agent is boron trifluoride monoethylamine;

[0060] In this embodiment, the shrinkage agent is nitrocellulose;

[0061] A method for adopting a liquid seal layer of a degradable rubber stopper, comprising the steps of:

[0062] 1) Mix the degradable rubber plug liquid evenly at room temperature, pump 150L of the degradable rubber plug liquid into the wellbore, and use clean water to replace the rubber plug liquid to the target layer, and the temperature of the target layer is 130°C;

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Abstract

The invention discloses a degradable rubber plug liquid, and a method for sealing a layer by using the degradable rubber plug liquid. The rubber plug liquid is prepared from, by weight, 60-75% of a resin matrix, 15-34% of a comonomer, 0.1-4% of a curing agent and 1-10% of a shrinking agent. Results of the embodiment show that the degradable rubber plug liquid provided by the invention is simple in use method and can meet the requirements of sealing layers. The cured rubber plug is good in temperature resistance and pressure resistance, and can be completely dissolved in a short time.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a degradable rubber plug liquid and a method for utilizing the degradable rubber plug liquid sealing layer. Background technique [0002] In the field of oil and gas field development, bridge plugs are often used to seal the wellbore. When using mechanical tools such as bridge plugs, it is necessary to use oil pipes, cables and other tools to lower the bridge plugs to the designated position. The process is more complicated. The patent "Liquid Rubber Plug and Method for Pressing Up Coiled Tubing Velocity String Using Liquid Rubber Tape (201410112994.6)" discloses a method of using guar gum as a thickening agent to complete coiled tubing with pressure. However, the use temperature of this kind of rubber plug is relatively low, between 70°C and 90°C, and the sealing time is relatively short. The patent "Rubber plug fluid for degradable chemical plugging of oil and ga...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/22C08G59/42C09K8/44
CPCC08G59/22C08G59/4223C09K8/44
Inventor 周涛
Owner LINGNAN NORMAL UNIV
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