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A kind of gas-soluble sealing emulsion and preparation method thereof

An emulsion and gas-soluble technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of plugging failure and slow plugging, and achieve the advantages of preventing crack opening, good pressure bearing performance, and wide application range Effect

Active Publication Date: 2022-04-29
青岛科凯达橡塑有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the embodiment of the present invention provides an aerosol sealing emulsion and its preparation method to solve the problems of slow plugging and easy plugging failure due to gas well back-vomiting pressure caused by the existing cement slurry plugging agent. question

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  • A kind of gas-soluble sealing emulsion and preparation method thereof
  • A kind of gas-soluble sealing emulsion and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 210 grams of deionized water, 3 grams of sodium dodecylsulfonate, and 0.03 grams of EDTA sodium salt were sequentially added to a 1000 mL four-necked flask, and stirred at 240 rpm to form a solution. Remove the air under 0.09MPa vacuum and replace with nitrogen 3 times.

[0042] Add 140 grams of butadiene and 60 grams of styrene to this solution in sequence, add 0.24 grams of initiator azobisisobutyronitrile after nitrogen replacement, heat up to 45 degrees under stirring for 8 hours, and the reaction solution drops to room temperature.

[0043] 10 grams of butyl acrylate and 10 grams of lauryl acrylate were added to the reaction system, and 0.24 grams of initiator azobisisobutyronitrile was added after nitrogen replacement again. The reaction was continued at 25° C. for 6 hours under nitrogen flow. Gel chromatography detects that the monomer conversion rate is >99%, and the reaction is stopped.

[0044] Add 0.4 g of butyl 3-mercaptoacrylate to the reaction liquid, cont...

Embodiment 2

[0048] 225 grams of deionized water, 3 grams of sodium dodecylsulfonate, 3 grams of disproportionated sodium abietate, and 0.03 grams of acetylacetone were added to a 1000 mL four-necked flask in sequence, and stirred at 240 rpm to form a solution. Remove the air under 0.09MPa vacuum and replace with nitrogen 3 times.

[0049] Add 160 grams of butadiene and 60 grams of styrene to this solution successively, add 0.3 grams of initiator benzoyl peroxide after nitrogen replacement, heat up to 55 degrees under stirring and react for 6 hours. The reaction solution was cooled to room temperature.

[0050] 20 grams of butyl acrylate and 20 grams of lauryl acrylate were added to the reaction system, and 0.3 grams of initiator benzoyl peroxide was added after nitrogen replacement again. The reaction was continued at 25° C. for 8 hours under nitrogen flow. Gel chromatography detects that the monomer conversion rate is >99%, and the reaction is stopped.

[0051] 0.6 g of isooctyl 3-mer...

Embodiment 3

[0055] 420 grams of deionized water, 3 grams of disproportionated sodium abietate, 3 grams of sodium petroleum alkyl sulfonate, and 0.06 grams of chitosan were sequentially added to a 2000 mL four-necked flask, and stirred at 240 rpm to form a solution. Remove the air under 0.09MPa vacuum and replace with nitrogen 3 times.

[0056] Add 280 grams of butadiene and 140 grams of styrene to this solution successively, add 0.5 grams of initiator after nitrogen replacement, heat up to 45 degrees under stirring and react for 8 hours. The reaction solution was cooled to room temperature.

[0057] 20 grams of butyl acrylate and 20 grams of lauryl acrylate were added to the reaction system, and 0.5 grams of initiator was added after nitrogen replacement again, and the reaction was continued for 6 hours at 25 degrees under nitrogen flow. Gel chromatography detects that the monomer conversion rate is >99%, and the reaction is stopped. The initiator in the present embodiment is ferrous su...

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Abstract

The invention discloses an aerosol sealing emulsion and a preparation method thereof. The sealing agent is mainly prepared from the following components in parts by mass: 60-90 parts of butadiene monomer, 25-90 parts of styrene monomer 55 parts, 3-15 parts of butyl acrylate, 3-15 parts of lauryl acrylate, 1.5-3 parts of emulsifier, 100-120 parts of deionized water, 0.16-0.35 parts of molecular weight regulator, 0.02-0.04 parts of antioxidant , 5-12 parts of extender oil, 0.1-0.4 parts of initiator, 0.01-0.025 parts of chelating agent, and 0.1-0.5 part of chain terminator. The gas-soluble sealing emulsion of the present invention forms a plug for formation water, and at the same time has good retention and pressure bearing capacity, reduces the water content, improves the extraction efficiency of natural gas, has a good plugging effect on micro-cracks, and prevents cracks Open to ensure the stability of the well wall of the gas well, and can quickly dissolve in shale gas, natural gas, and coalbed methane, and be discharged with the gas and liquid, forming a fast gas path without damage to the underground rock formation.

Description

technical field [0001] The invention relates to the field of gas well production and plugging, in particular to an aerosol sealing emulsion and a preparation method thereof. Background technique [0002] In the process of mineral mining, the plugging construction of gas wells is more difficult than that of oil wells. At present, cement slurry is generally used to plug gas wells. However, the traditional cement slurry plugging agent has high water loss and poor fluidity. In the actual construction process, the cement slurry cannot be quickly condensed into a certain strength plugging layer, which will not only affect the construction period, but also be easily caused by gas wells. Gas channeling caused plugging failure; and when the plugging string was lifted, suction pressure was generated in the well, which made the cement slurry entering the formation flow back into the wellbore, resulting in the failure of plugging the gas well. [0003] Therefore, the existing plugging ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F212/08C08F220/18C09K8/508
Inventor 张哲郑君陈秀秀
Owner 青岛科凯达橡塑有限公司
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