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Modified resin, application of modified resin in plugging agent, high-temperature plugging agent and application of high-temperature plugging agent in plugging of high-temperature discarded well

A technology of modified resin and plugging agent, which is applied in sealing/isolation, drilling composition, wellbore/well parts, etc., and can solve problems such as low temperature range and long thickening time

Pending Publication Date: 2021-11-12
CNOOC ENERGY TECH & SERVICES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Compared with conventional cement slurry, the resin plugging system involved in the above patent has better fluidity, longer thickening time, and greater improvement in strength and toughness, but the temperature range of the research is low, and the applicable temperature is not high. More than 120℃, or even lower temperature

Method used

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  • Modified resin, application of modified resin in plugging agent, high-temperature plugging agent and application of high-temperature plugging agent in plugging of high-temperature discarded well
  • Modified resin, application of modified resin in plugging agent, high-temperature plugging agent and application of high-temperature plugging agent in plugging of high-temperature discarded well
  • Modified resin, application of modified resin in plugging agent, high-temperature plugging agent and application of high-temperature plugging agent in plugging of high-temperature discarded well

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preparation example Construction

[0039] In the present invention, the preparation method of the modified resin preferably comprises the following steps:

[0040] The epoxy resin, diluent, emulsifier, coupling agent and defoamer are mixed and modified to obtain the modified resin.

[0041] In the present invention, the mixing modification preferably includes the following steps:

[0042] The epoxy resin and the diluent are mixed for the first time to obtain the first mixed material;

[0043] performing a second mixing of the first mixed material and an emulsifier to obtain a second mixed material;

[0044] performing a third mixing of the second mixed material and the coupling agent to obtain a third mixed material;

[0045] The third mixed material and the defoamer are mixed for the fourth time to obtain the modified resin.

[0046] In the present invention, the epoxy resin and the diluent are first mixed to obtain the first mixed material.

[0047] In the present invention, the temperature of the first m...

Embodiment 1

[0095] (1) Preparation of modified resin

[0096] Take by weight 100 parts of epoxy resin (novolac epoxy resin, bisphenol A epoxy resin, hydantoin resin prepared by mass ratio 1:1:1), add 12 parts of ethylene glycol glycidyl ether and mix, Disperse and stir at a speed of 500r / min for 10min until the dispersion is uniform, add 5 parts of polyoxyethylene aryl ether, stir at a speed of 500r / min for 10min, then add 6 parts of silane coupling agent, and mix at a speed of 1000r / min Stir for 10 minutes, and finally add 2 parts of polyoxypropylene glyceryl ether, and stir for 5 minutes at a speed of 500 r / min to obtain a modified resin.

[0097] (2) Preparation of high temperature resistant non-solid plugging coagulant

[0098] Weigh 80 parts of the modified resin according to the number of parts by mass, add 8 parts of diluent (the mass ratio of ethylene glycol glycidyl ether and ethyl acetate is 1:1), disperse and stir at a speed of 500r / min for 10min until the dispersion is unifor...

Embodiment 2

[0100] (1) Preparation of modified resin

[0101] Take by weight 100 parts of epoxy resin (novolak epoxy resin, bisphenol A epoxy resin, hydantoin resin prepared by mass ratio 1:1:1), add 15 parts of ethylene glycol glycidyl ether and mix, Disperse and stir at a speed of 500r / min for 15 minutes until the dispersion is uniform, add 8 parts of polyoxyethylene aryl ether, stir at a speed of 500r / min for 15 minutes, then add 5 parts of silane coupling agent, Stir for 15 minutes, and finally add 2 parts of polyoxypropylene glyceryl ether, and stir for 10 minutes at a speed of 500 r / min to obtain a modified resin.

[0102] (2) Preparation of high temperature resistant non-solid plugging coagulant

[0103] Weigh 90 parts of the modified resin according to the number of parts by mass, add 10 parts of diluent (the mass ratio of ethylene glycol glycidyl ether and ethyl acetate is 1:1), disperse and stir at a speed of 500r / min for 15min until the dispersion is uniform, Add 15 parts of ...

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Abstract

The invention belongs to the technical field of petroleum drilling engineering chemical agents, and particularly relates to modified resin and application thereof, and a high-temperature plugging agent and application thereof. The modified resin comprises the following components in parts by mass: 95-105 parts of an epoxy resin mixture, 10-20 parts of a diluent, 5-15 parts of an emulsifier, 4-8 parts of a coupling agent and 1-3 parts of a defoaming agent, the epoxy resin mixture is composed of epoxy resin and water-borne epoxy resin, and the mass ratio of the solvent type epoxy resin to the water-borne epoxy resin is (1-3): (1-5). The high-temperature-resistant solid-free plugging agent prepared by taking the modified resin as a key component overcomes the problems that a pure resin system is easy to generate a flash coagulation phenomenon under an ultrahigh-temperature condition, the thickening time is shortened and the stability of a plugging system cannot be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of petroleum drilling engineering chemical agents, and in particular relates to a modified resin and its application in a plugging agent, a high-temperature sealing agent and its application in high-temperature abandoned well sealing. Background technique [0002] Offshore oil and gas fields have entered the middle and later stages, and abandonment operations have become an unavoidable task. At present, there are disadvantages in using cement slurry to seal abandoned wells. After long-term high-temperature and high-pressure environments after abandonment, the strength of cement stones decays; acidic gas corrodes cement stones, resulting in cracks in cement stones The long-term integrity requirements of the wellbore after abandonment cannot be effectively guaranteed, especially in the case of gas well annulus under pressure, low-permeability oil and gas layers, thermal recovery well abandonment, etc., the well...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/04C08L63/00C08L71/02C08K5/544C08K5/5425C09K8/44E21B33/13
CPCC08L63/04C08L63/00C09K8/44E21B33/13C08L2201/08C08L2205/025C08L2205/035C08L71/02C08K5/544C08K5/5425
Inventor 耿学礼苏延辉史斌黄毓祥郑晓斌徐鸿飞高波马西旗张静王超江安张艳
Owner CNOOC ENERGY TECH & SERVICES
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