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Shape memory plugging agent as well as preparation method and application thereof

A plugging agent and memory technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low organic high elastic polymer foam structure support force, slow speed, poor plugging effect, etc., to achieve Better leakage prevention and/or plugging effect, uniform distribution and strong support effect

Active Publication Date: 2020-06-19
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem solved by the present invention is that in the prior art, fiber cement slurry is used for cementing operations, which requires manual fiber addition, which is slow, the plugging effect is not good, or the support force of the organic high elastic polymer foam structure is small, and it is difficult to support for a long time at least one aspect of the gap

Method used

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  • Shape memory plugging agent as well as preparation method and application thereof

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preparation example Construction

[0035] Another embodiment of the present invention also provides a method for preparing the above-mentioned shape memory plugging agent, which includes: pressing shape memory polymer particles or shape memory composite particles with a foam structure into a plate, cooling to room temperature, and cutting Shape memory plugging agent is obtained after granulation.

[0036] Preferably, in a preparation method of the above-mentioned shape memory plugging agent, granulation is performed at a temperature higher than or equal to the minimum value of the deformation temperature of the shape memory polymer particles or the shape memory composite particles to form a granular shape, which is convenient Mixed, and not easy to reunite. It should be pointed out that, generally speaking, the deformation temperature of temperature-sensitive shape memory polymers generally has a certain temperature range. Therefore, the two endpoints in the deformation temperature range are the lowest value of th...

Embodiment 1

[0044] This embodiment provides a shape memory polymer particle based on epoxy resin, including epoxy resin, curing agent, and accelerator. The epoxy resin is a low molecular weight epoxy resin, and the average value of n is less than 2. The softening point is lower than 50℃, the epoxy value is larger; the curing agent is selected from amine curing agent, and the ratio of curing agent and epoxy resin is adjusted to make the degree of crosslinking 60%-70%, Tg can be 50% It can be adjusted between ℃-100℃. Based on the above method, an epoxy resin shape memory polymer with a shape memory deformation temperature of 65-70℃ can be obtained. After foaming, an epoxy resin shape memory polymer with a foam structure can be prepared. Compress at 65-85°C to form a sheet, and cool down to room temperature.

[0045] The shape memory epoxy resin board was cut into a rectangular parallelepiped shape of 250mm×25mm×2.5mm for tensile testing. The shape memory epoxy resin board was cut into a recta...

Embodiment 2

[0048] This embodiment provides a shape memory polymer particle based on epoxy resin, including epoxy resin and curing agent, wherein the epoxy resin is an epoxy resin with a medium molecular weight, and the value is between 2 and 5, softening The point is between 50~95℃; the curing agent is selected from amine curing agent, and the ratio of curing agent to epoxy resin is adjusted so that the crosslinking degree is 90%-100%, and the curing process can be combined to make it The curing speed and curing temperature increase, and the curing time increases. The Tg can be adjusted between 100°C and 140°C. Based on the above method, an epoxy resin shape memory polymer with a shape memory deformation temperature of 110-115°C can be obtained. After foaming Prepared into an epoxy resin shape memory polymer with a foam structure, and compressed at 110-125°C to form a sheet. After cooling the temperature to room temperature, the compressed sheet is granulated by a cutting pelletizer. The s...

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Abstract

The invention provides a shape memory plugging agent as well as a preparation method and application thereof. The invention belongs to the technical field of leakage prevention or repair. The shape memory plugging agent comprises shape memory particles, the shape memory particles are of a foam structure, the shape memory particles comprise shape memory polymer particles of the same series and / or shape memory composite material particles of the same series, and the shape memory particles can achieve shape recovery under the temperature gradient. Comparing with the prior art, the material composition is simple, the shape memory particles can be directly added into the plugging slurry, the high-difficulty operation procedure of adding fibers while injecting in the process of using the fibersis avoided, the problem that the leakage-proof and / or leaking stoppage effect cannot be fully displayed due to too small adding amount is also avoided, the distribution of the shape memory particles in the leaking stoppage liquid is more uniform, the leakage-proof and / or leaking stoppage effect are / is better, and the supporting force is strong.

Description

Technical field [0001] The present invention relates to the technical field of leakage prevention or compensation, and in particular to a shape memory plugging agent, a preparation method and application thereof. Background technique [0002] Lost circulation is one of the common downhole complex situations in the process of drilling and cementing. Lost well not only consumes drilling time and loses drilling fluid and cement slurry, but also may cause sticking, blowout, well collapse, poor cementing quality and other problems, and even lead to borehole scrapping accidents and cause major economic losses. [0003] Conventional cement slurry does not have the plugging function. In the prior art, some fiber cement slurry is used for cementing operations, but the fiber needs to be added manually, which is slower, and too much fiber will affect the rheological properties of the cement slurry In addition, the length of the fiber should not be too long, which limits the plugging effect o...

Claims

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Application Information

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IPC IPC(8): C09K8/467C09K8/42C09K8/035C08L63/00C08J9/00
CPCC09K8/467C09K8/426C09K8/035C08J9/00C08J2363/00
Inventor 冷劲松李悦嘉张风华刘彦菊
Owner HARBIN INST OF TECH
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