Temperature-control shape memory plugging agent and preparation method thereof

A plugging agent and memory technology, which is applied in the field of leak prevention and plugging, can solve the problems of affecting the rheological properties of cement slurry, slow fiber speed, and limiting the plugging effect of fiber plugging slurry, so as to achieve good plugging effect and improve toughness and strength, increase the effect of toughness

Inactive Publication Date: 2019-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the speed of manually spreading fibers on the cement truck is slow, and adding too much fiber will affect the rheological properties of the cement slurry, so the general adding amount is <5‰ (accounting for the amount of cement)
In addition, the length of the fiber should not be too long, which limits the plugging effect of the fiber plugging slurry

Method used

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  • Temperature-control shape memory plugging agent and preparation method thereof
  • Temperature-control shape memory plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation of Styrene-Butadiene Copolymer Based Oil Well Cement with Shape Memory Particles, Cement Slurry and Cement Stone Module

[0044] A styrene-butadiene shape-memory polymer whose shape-memory deformation temperature is 55-60° C. is crushed into a shape-memory polymer powder of 0.16-0.5 mm by cryogenic freezing.

[0045] The hollow high elastic foam sponge is a polyurethane foam sponge.

[0046] Heat and melt the temperature-sensitive shape memory polymer powder, and evenly coat the uncompressed hollow high-elastic foam sponge with the temperature-sensitive shape memory polymer hot melt solution, each accounting for 50% by mass; cool the mixed materials to 55 Compress at -75°C to make a compressed tablet, and cool down to room temperature.

[0047] The compressed flakes are granulated with a cutting granulator, and the size of the granulation is controlled to be less than 3mm in diameter and length, such as 0.5mm, 1mm, 2mm, and 3mm, so as to facilitate mixing. ...

Embodiment 2

[0051] Preparation of shape memory particles, cement paste and cement stone modules for oil well cement based on polyurethane copolymer

[0052] A polyurethane shape-memory polymer whose shape-memory deformation temperature is 65-70° C. is crushed into a shape-memory polymer powder of 0.07-0.16 mm by cryogenic freezing.

[0053] The hollow high elastic foam sponge is a polyether foam sponge.

[0054] The temperature-sensitive shape memory polymer powder is heated and melted, and the uncompressed hollow high-elastic foam sponge is evenly coated with the temperature-sensitive shape-memory polymer hot melt solution. The mass ratios of the hollow high-elastic foam sponge and the shape-memory polymer powder are respectively 80% and 20%; the uniformly mixed material is cooled to 65-85° C., compressed to make a compressed tablet, and cooled to room temperature.

[0055] The compressed flakes are granulated with a cutting granulator, and the size of the granulation is controlled to b...

Embodiment 3

[0059] Preparation of shape-memory particles, cement paste and cement stone modules for oil well cement based on polyvinyl acetal gel and ethylene-vinyl acetate copolymer

[0060] A kind of polyvinyl acetal gel and ethylene-vinyl acetate copolymer whose shape memory deformation temperature is 65-70 DEG C are crushed into 0.05-0.16mm by low-temperature freezing.

[0061] The hollow high elastic foam sponge is a rubber foam sponge.

[0062] The temperature-sensitive shape memory polymer powder is heated and melted, and the uncompressed hollow high-elastic foam sponge is evenly coated with the temperature-sensitive shape-memory polymer hot melt solution. The mass ratios of the hollow high-elastic foam sponge and the shape-memory polymer powder are respectively 20% and 80%; the uniformly mixed material is cooled to 65-85° C., compressed to make a compressed sheet, and cooled to room temperature.

[0063] The compressed flakes are granulated with a cutting granulator, and the size...

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Abstract

The invention discloses a temperature-control shape memory plugging agent and a preparation method thereof. The plugging agent is a shape memory particle; the shape memory particle comprises: hollow high-elasticity foam sponge and a temperature-sensitive type shape memory polymer coated on the hollow high-elasticity foam sponge, wherein the content of the temperature-sensitive type shape memory polymer is 20 to 99.99 weight percent of the shape memory particle; and the grain diameter of the shape memory particle is less than or equal to 8mm. The preparation method comprises the following steps: crushing, heating and melting the temperature-sensitive type shape memory polymer; uniformly coating the uncompressed hollow high-elasticity foam sponge with a temperature-sensitive type shape memory polymer hot melt solution; compressing to prepare a compressed flake; and cooling to room temperature, and cutting and granulating. According to the temperature-control shape memory plugging agent,an organic hollow high-elasticity foam sponge compound structure is adopted, and the temperature-sensitive type shape memory polymer is used for bonding and granulating. The temperature-control shapememory plugging agent is added into well cementation cement slurry or drilling mud and is stimulated by a suitable downhole temperature rising environment and the volume is expanded for a plurality oftimes; and a volume steric effect is utilized to realize the aim of plugging rock fractures.

Description

technical field [0001] The invention relates to the technical field of leak prevention and plugging, and more particularly relates to a temperature-controlled shape memory leak plugging agent and a preparation method thereof. Background technique [0002] Lost circulation is one of the common downhole complex situations in the process of drilling and cementing. Lost circulation not only consumes drilling time and loses drilling fluid and cement slurry, but also may cause problems such as pipe sticking, blowout, well collapse, poor cementing quality, etc., and even lead to wellbore scrapping accidents, resulting in major economic losses. [0003] Solving the leakage problem of oil and gas wells has always been a topic of concern for major oil and gas fields. Conventional well cementing cement slurry does not have the function of plugging, but after adding inert fiber materials, due to the accumulation and bridging effect of fibers, it is easy to form a network structure in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/467C09K8/035
CPCC09K8/035C09K8/426C09K8/467
Inventor 刘学鹏刘伟周仕明
Owner CHINA PETROLEUM & CHEM CORP
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