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A low-temperature self-degradation high-strength composite temporary plugging diversion agent and its preparation method

A technology of self-degradation and diverting agent, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of difficult degradation or degradation time, narrow applicable temperature range of reservoirs, and low plugging strength, etc., to achieve plugging The effect of good performance, high pressure bearing strength and convenient operation

Active Publication Date: 2022-03-29
XIAN ZHUOSHI OILFIELD TECH SERVICES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing temporary plugging and diverting agents have the following disadvantages: low plugging strength, low pressure bearing strength, not easy to degrade or degrade for a long time, easy to cause pollution to the reservoir, and the applicable temperature range of the reservoir is narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A composite temporary blocking diversion agent, the diversion agent includes high-strength self-degradable particles and low-strength self-dissolving particles, and the high-strength self-degradable particles include polylactic acid, corn starch, styrene, polycaprolactone and unsaturated Polyester; the low-strength self-dissolving particles include a partially hydrolyzed polyacrylamide solution and a cross-linking agent.

[0031] The mass ratio of high-strength self-degrading particles and low-strength self-dissolving particles is 2:1.

[0032] The mass ratio of polylactic acid, cornstarch, styrene, polycaprolactone and unsaturated polyester is 60:10:10:5:3.

[0033] The mass ratio of the partially hydrolyzed polyacrylamide solution to the crosslinking agent is 5:1.

[0034] The unsaturated polyester is maleic anhydride.

[0035] The crosslinking agent is sodium borate.

[0036] The high-strength self-degrading particles are cylinders with a diameter of 1.5mmmm and a...

Embodiment 2

[0044] A composite temporary blocking diversion agent, the diversion agent includes high-strength self-degradable particles and low-strength self-dissolving particles, and the high-strength self-degradable particles include polylactic acid, corn starch, styrene, polycaprolactone and unsaturated Polyester; the low-strength self-dissolving particles include a partially hydrolyzed polyacrylamide solution and a cross-linking agent.

[0045] The mass ratio of high-strength self-degrading particles and low-strength self-dissolving particles is 5:1.

[0046] The mass ratio of polylactic acid, cornstarch, styrene, polycaprolactone and unsaturated polyester is 65:12:12:7.5:3.5.

[0047] The mass ratio of the partially hydrolyzed polyacrylamide solution to the crosslinking agent is 7:1.

[0048] The unsaturated polyester is a mixture of maleic anhydride and phthalic anhydride.

[0049] The crosslinking agent is a mixture of sodium borate and potassium dichromate.

[0050] The high-st...

Embodiment 3

[0058] A composite temporary blocking diversion agent, the diversion agent includes high-strength self-degradable particles and low-strength self-dissolving particles, and the high-strength self-degradable particles include polylactic acid, corn starch, styrene, polycaprolactone and unsaturated Polyester; the low-strength self-dissolving particles include a partially hydrolyzed polyacrylamide solution and a cross-linking agent.

[0059] The mass ratio of high-strength self-degrading particles and low-strength self-dissolving particles is 8:1.

[0060] The mass ratio of polylactic acid, cornstarch, styrene, polycaprolactone and unsaturated polyester is 75:15:15:8:5.

[0061] The mass ratio of the partially hydrolyzed polyacrylamide solution to the crosslinking agent is 10:3.

[0062] The unsaturated polyester is a mixture of maleic anhydride, phthalic anhydride and propylene glycol.

[0063] The crosslinking agent is a mixture of sodium borate, potassium dichromate and formal...

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Abstract

The invention provides a low-temperature self-degrading high-strength composite temporary blocking diversion agent and a preparation method thereof. The diversion agent includes high-strength self-degradable particles and low-strength self-dissolving particles, and the high-strength self-degradable particles include polylactic acid and corn starch , styrene, polycaprolactone and unsaturated polyester; the low-strength self-dissolving particles include partially hydrolyzed polyacrylamide solution and cross-linking agent. The preparation method includes: mixing polylactic acid, cornstarch, styrene, polycaprolactone and unsaturated polyester, extruding after heating up to obtain high-strength self-degradable particles; mixing partially hydrolyzed polyacrylamide solution and cross-linked Combined agent, heating reaction to obtain jelly body, the jelly body is cooled and dried, crushed and formed to obtain low-strength self-dissolving particles; high-strength self-degradable particles and low-strength self-dissolving particles are mixed to obtain a composite temporary plugging diversion agent. The composite temporary plugging diverting agent has good plugging performance, high pressure bearing strength, good degradation performance and no pollution to reservoirs.

Description

technical field [0001] The invention relates to the field of oilfield chemistry, in particular to a low-temperature self-degrading high-strength composite temporary plugging diversion agent and a preparation method thereof. Background technique [0002] Temporary plugging diversion fracturing technology, that is, during the fracturing process, the temporary plugging diversion agent is injected into the wellbore in real time along with the fracturing fluid and fracturing proppant. When the temporary plugging diversion agent reaches the old fracture or the opening of the fracture, The fractures near the wellbore are blocked by bridging and accumulation effects, and then the fracturing fluid is continuously injected to increase the pressure, and then the fluid is diverted through changes in formation fracture pressure and fracture extension pressure, thereby creating new fractures. [0003] The principle of using the temporary plugging diverting agent to promote the generation ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/514C09K8/516
CPCC09K8/512C09K8/514C09K8/516
Inventor 李江鹏
Owner XIAN ZHUOSHI OILFIELD TECH SERVICES CO LTD
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