An epoxy-phenolic system water blocking agent used in oil and gas field exploitation

A technology of oil and gas field and water shutoff agent, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of water outlet section plugging, etc., and achieve the advantages of reducing adverse effects, high strength after curing, and wide applicable temperature range Effect

Active Publication Date: 2020-09-11
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the deficiencies of the water shutoff agents used in the exploitation of oil and gas fields in the prior art, the purpose of the present invention is to provide a new type of epoxy-phenolic system water shutoff agent suitable for the harsh environment downhole, so as to solve the problems of water-bearing oil and gas wells. segment blockage

Method used

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  • An epoxy-phenolic system water blocking agent used in oil and gas field exploitation
  • An epoxy-phenolic system water blocking agent used in oil and gas field exploitation
  • An epoxy-phenolic system water blocking agent used in oil and gas field exploitation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Melt and mix 45 parts of bisphenol F epoxy resin and 30 parts of novolak resin, add 0.03 parts of imidazole accelerator and 30 parts of methanol, and stir well. To simulate the underground curing environment, a hydrothermal kettle was used as the reaction vessel. Pour the resin slurry into a hydrothermal kettle filled with distilled water, seal it and cure it at 130°C.

[0047] Performance test: The epoxy resin slurry prepared in Example 1 has a viscosity of 48.5 mPa.s measured at 25° C., a curing time of 5 hours, and a compressive strength of 85 MPa.

Embodiment 2

[0049] Melt and mix 45 parts of bisphenol F epoxy resin and 30 parts of novolac resin, add 0.01 part of imidazole accelerator and 30 parts of methanol, and stir well. To simulate the underground curing environment, a hydrothermal kettle was used as the reaction vessel. Pour the resin slurry into a hydrothermal kettle filled with distilled water, seal it and cure it at 130°C.

[0050] Performance test: The epoxy resin slurry prepared in Example 2 has a viscosity of 48.5 mPa.s measured at 25° C., a curing time of 7 hours, and a compressive strength of 82 MPa.

Embodiment 3

[0052] Melt and mix 45 parts of bisphenol F epoxy resin and 30 parts of novolak resin, add 0.05 parts of imidazole accelerator and 30 parts of methanol, and stir well. To simulate the underground curing environment, a hydrothermal kettle was used as the reaction vessel. Pour the resin slurry into a hydrothermal kettle filled with distilled water, seal it and cure it at 130°C.

[0053] Performance test: The epoxy resin slurry prepared in Example 3 has a viscosity of 48.5 mPa.s measured at 25° C., a curing time of 3 hours, and a compressive strength of 90 MPa.

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Abstract

The invention discloses an epoxy-phenolic system water plugging agent used in oil and gas field exploitation. The epoxy-phenolic system water plugging agent is a novel water plugging agent formed by using epoxy resin as a resin matrix, novolac resin as a curing agent, imidazole as an accelerator and an alcohol or a ketone as a migratory diluent. The migratory diluent can greatly reduce the viscosity of the water plugging agent and ensure the transportability of the water plugging agent; and the migration diluent migrates into a water phase after meeting stratum water, and other components in the system settle to the bottom of a water layer in order to achieve effective curing. The addition of the migratory diluent reduces the adverse influences of the diluent on the curing process and theproperties of a cured product in order to achieve an adjustable curing time and ensure the mechanical strength of the cured product. The water plugging agent has the characteristics of low viscosity,good perfusion fluidity, wide application temperature range, adjustable curing speed and high strength after curing, and still has an excellent plugging property in high-temperature, high-salt, acidicand alkaline environments.

Description

technical field [0001] The invention relates to a water shutoff agent used in the process of oil and gas field exploitation, in particular to an epoxy-phenolic system water shutoff agent used in the harsh underground environment of oil and gas field exploitation. Background technique [0002] In the process of oil and gas field exploitation, some oil and gas wells are prematurely watered or flooded due to channeling of water layer, coning of bottom water or intrusion of water injection and edge water. In order to remove or reduce water flooding, control the flow of water in the water-producing layer, and enhance oil and gas recovery, water blocking agents are usually used to block the water-producing section of the production well or injection well. Water production in oil and gas fields is a common problem. Water blocking agent is the main means to solve this problem, and it is also an important means to improve oil and gas recovery and economic benefits. The water blockin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/508
CPCC09K8/5086
Inventor 黄光速党向前刘汉超张文昌吴锦荣徐海民黄鑫黄鹂
Owner SICHUAN UNIV
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