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Thermo-expandable device and preparation method

A device and thermal technology, applied in the field of thermal expansion devices and preparation, can solve the problems of limiting the plugging effect of fiber plugging slurry, affecting the rheological properties of cement slurry, and slow fiber speed, etc., to achieve good plugging effect, principle Feasible, increased fluid resistance effect

Active 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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  • Thermo-expandable device and preparation method
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  • Thermo-expandable device and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of Styrene-Butadiene Copolymer Based Oil Well Cement with Shape Memory Particles, Cement Slurry and Cement Stone Module

[0050] 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.

[0051] The shape memory polymer powder is heated and melted, and the copper tough sheet and the shape memory polymer hot melt are coated and mixed evenly, each accounting for 50% by mass; the uniformly mixed material is cooled to 55-75°C, and the Coils, made into rolls, cooled to room temperature.

[0052] The compressed rolls 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.

[0053] Weigh 100 parts by mass of oil well cement, shape memory particles accounting for 2% of the cement mass (ie 2 parts by mass), a...

Embodiment 2

[0056] Preparation of shape memory particles, cement paste and cement stone modules for oil well cement based on polyurethane copolymer

[0057] 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.

[0058] The shape memory polymer powder is heated and melted, and the stainless steel tough sheet and the shape memory polymer hot melt are coated and mixed evenly. The stainless steel tough sheet and the shape memory polymer powder account for 80% and 20% by mass respectively ; Cool the uniformly mixed material to 65-85°C, roll it into a roll, and cool it to room temperature.

[0059] The compressed rolls 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.

[0060] Weigh 100 parts by mass of oil well cement, 2% shape m...

Embodiment 3

[0063] 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

[0064] 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.

[0065] The shape memory polymer powder is heated and melted, the aluminum tough sheet and the shape memory polymer hot melt are coated and mixed evenly, and the mass ratio of the aluminum tough sheet and the shape memory polymer powder is 20% and 80% respectively ; Cool the uniformly mixed material to 65-85°C, roll it into a roll, and cool it to room temperature.

[0066] The compressed rolls 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.

[0067] Weigh 100 parts by mass o...

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Abstract

The invention discloses a thermo-expandable device and a preparation method. The thermo-expandable device is a shape memory particle; the shape memory particle comprises a tough sheet and a temperature-sensitive shape memory polymer coated by the tough sheet; the content of the temperature-sensitive shape memory polymer is 20-99.99 wt% of the shape memory particle; the shape memory particle has aparticle size of less than or equal to 8 mm. The preparation method comprises the steps of pulverizing and heating and melting the temperature-sensitive shape memory polymer; uniformly coating the temperature-sensitive shape memory polymer hot melt liquid on the tough sheet; performing coiling to form a roll; and cooling the roll to room temperature for cutting and pelletizing. The thermo-expandable device disclosed by the invention is added to a well-cementing cement slurry and is excited by a suitable underground temperature increase environment; the surface area is expanded multiple times;and the volume steric hindrance effect in the fluid is utilized to achieve the purpose of plugging the rock fracture.

Description

technical field [0001] The invention relates to the technical field of well cementing, and more specifically, relates to a thermal expansion device and a preparation method. 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 the lost channel, and the conventional performance of...

Claims

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Application Information

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IPC IPC(8): C04B20/10C04B14/34C04B16/04C04B14/38
CPCC04B14/34C04B14/386C04B16/04C04B20/1033C04B20/1037C04B20/0016
Inventor 刘学鹏刘伟周仕明
Owner CHINA PETROLEUM & CHEM CORP
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