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Crack plugging while drilling gas invasion prevention agent and preparation method thereof

A crack and gas prevention technology, applied in the field of oil drilling, can solve the problems of no compressibility of the plugging layer, gas intrusion overflow, unable to obtain compressibility and lead to sealing and plugging, etc., so as to reduce permeability and prevent gas intrusion. Effect

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional solid particle plugging materials can only block the openings of micro-fractures externally. Once the wellbore fluid circulates, these plugging materials will be washed away from the openings of micro-fractures, and there will be a risk of gas flooding again. Moreover, these The plugging materials are all traditional rigid solid materials, and the plugging layer formed is not compressible, and compressibility tight sealing cannot be obtained

Method used

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  • Crack plugging while drilling gas invasion prevention agent and preparation method thereof
  • Crack plugging while drilling gas invasion prevention agent and preparation method thereof
  • Crack plugging while drilling gas invasion prevention agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of the anti-gas intrusion agent for sealing cracks while drilling:

[0047] 1) Weigh 15.2 parts of polyethylene glycol and add it to 260 parts by mass of water, let it stand at room temperature for 40 minutes, then stir and mix evenly at a constant temperature of 35°C;

[0048] 2) Weigh 25.5 parts by mass of maleic anhydride and 25.5 parts of trimethylolpropane diallyl ether, add them to the above solution, stir and mix evenly;

[0049] 3) Heat the above solution to 50°C, and adjust the pH value of the solution to 9 with a pH regulator;

[0050] 4) Add an initiator, stir and react with the above mixed solution at 80°C for 100 minutes, and react to obtain a viscous polymer;

[0051] 5) Dry the viscous polymer at 104°C, grind and pulverize it through a 20-mesh sieve to obtain polymer particles;

[0052] 6) Sequentially weigh 0.5 parts by mass of bentonite, 35 parts of superfine calcium carbonate powder, and 5.0 parts of cotton fiber, add them to t...

Embodiment 2

[0055] The preparation method of the anti-gas intrusion agent for sealing cracks while drilling,

[0056] 1) Weigh 10.0 parts of polyethylene glycol and add it to 180 parts by mass of water, let it stand at room temperature for 30 minutes, then stir and mix evenly at a constant temperature of 30°C;

[0057] 2) Weigh 14.0 parts by mass of maleic anhydride and 14.5 parts of trimethylolpropane diallyl ether, add them to the above solution, stir and mix evenly;

[0058] 3) Heat the above solution to 40°C, and adjust the pH value of the solution to 7 with a pH regulator;

[0059] 4) Add an initiator, stir and react with the above mixed solution at 60°C for 60 minutes, and react to obtain a viscous polymer;

[0060] 5) Dry the viscous polymer at 90°C, grind and pulverize it through a 20-mesh sieve to obtain polymer particles;

[0061] 6) Sequentially weigh 0.2 parts of bentonite, 30 parts of superfine calcium carbonate powder, and 3.0 parts of cotton fiber into the polymer particl...

Embodiment 3

[0064] The preparation method of the anti-gas intrusion agent for sealing cracks while drilling,

[0065] 1) Weigh 12.2 parts of polyethylene glycol and add 200 parts by mass of water, let it stand at room temperature for 35 minutes, then stir and mix evenly at a constant temperature of 32°C;

[0066] 2) Weigh 20.5 parts by mass of maleic anhydride and 20.5 parts of trimethylolpropane diallyl ether, add them to the above solution, stir and mix evenly;

[0067] 3) Heat the above solution to 45°C, and adjust the pH value of the solution to 8 with a pH regulator;

[0068] 4) Add an initiator, stir and react with the above mixed solution at 70°C for 80 minutes, and react to obtain a viscous polymer;

[0069] 5) Dry the viscous polymer at 100°C, grind and pulverize it through a 20-mesh sieve to obtain polymer particles;

[0070] 6) Sequentially weigh 0.4 parts by mass of bentonite, 32 parts of superfine calcium carbonate powder, and 4.0 parts of cotton fiber, add them to the poly...

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Abstract

The invention relates to a crack plugging while drilling gas invasion prevention agent and a preparation method thereof. The crack plugging while drilling gas invasion prevention agent is composed of, by mass, 10-15.2 parts of polyethylene glycol, 14.0-25.5 parts of maleic anhydride, 14.5-25.5 parts of trimethylolpropane diallyl ether, 0.2-0.5 part of bentonite powder, 30-35 parts of superfine calcium carbonate powder, and 3.0-5.0 parts of cotton fiber. The microcrack plugging while drilling gas invasion prevention agent provided by the invention can effectively plug gas-bearing cracks, and when the dosage is 1-5%, the leakage of a drilling fluid base slurry in microcracks can be reduced from 500ml to 6ml, the plugging rate reaches 98.8%, and the bearing pressure for reverse gas penetration of the plugging layer in the microcracks is 3.5KPa.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling, and in particular relates to an anti-gas intrusion agent for plugging cracks while drilling and a preparation method thereof. Background technique [0002] In oil and natural gas fractured gas reservoir vertical well or directional well drilling, it is often encountered that the gas (natural gas, hydrogen sulfide, carbon dioxide) in the fracture of the gas reservoir invades the wellbore through the fracture under the gravity displacement of the wellbore or the gas-liquid displacement inside the fracture. During the process, local negative pressure gas intrusion is generated, resulting in overflow, which seriously affects the safety of drilling operations and ground workers. In the actual drilling, it was found that no obvious lost circulation occurred in the gas-invaded well section, indicating that the size of the fracture opening is not large. If the opening size is large and obvious...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/493
CPCC09K8/493C09K2208/08
Inventor 滕学清李宁蒲晓林康延军李怀仲杜小勇文志明周晓红樊文刘德英
Owner PETROCHINA CO LTD
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