Temperature-controlled shape memory blocking agent and preparation method

A technology of memory and plugging agent, which is applied in earthwork drilling, wellbore/well components, sealing/isolation, etc. It can solve the problem of limiting the plugging effect of fiber plugging slurry, affecting the rheological properties of cement slurry, and slow fiber speed, etc. problems, to achieve the effect of increasing toughness, increasing apparent volume, and efficient plugging

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-controlled shape memory blocking agent and preparation method
  • Temperature-controlled shape memory blocking agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Preparation of Styrene-Butadiene Copolymer Based Oil Well Cement with Shape Memory Particles, Cement Slurry and Cement Stone Module

[0062] 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.

[0063] The spring is carbon steel wire spring; 1.5mm after spring compression, 7.5mm before compression and after recovery;

[0064] heating and melting the shape memory polymer powder, coating and mixing the uncompressed spring and the shape memory polymer hot melt solution, each accounting for 50% by mass; cooling the uniformly mixed material to 55-75°C, and compressing, Made into a compression spring, cooled to room temperature.

[0065] The compressed spring wire is 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 mi...

Embodiment 2

[0069] Preparation of shape memory particles, cement paste and cement stone modules for oil well cement based on polyurethane copolymer

[0070] 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.

[0071] The spring is 50% chrome vanadium steel wire spring and 50% copper wire spring. Chrome vanadium steel wire spring is 1mm after compression, 6mm before compression and after recovery; copper wire spring is 0.5mm after compression, 5mm before compression and after recovery.

[0072] The shape memory polymer powder is heated and melted, and the uncompressed spring and the shape memory polymer hot melt are coated and mixed evenly, and the mass ratio of the spring and the shape memory polymer powder is 80% and 20% respectively; the uniformly mixed The material is cooled to 65-85°C, compressed to make a compression spring, and cooled to room temperature.

...

Embodiment 3

[0077] 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

[0078] 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 mesh by low-temperature freezing.

[0079] The spring is a carbon steel wire spring. 1.2mm after spring compression, 7mm before compression and after recovery.

[0080] The shape memory polymer powder is heated and melted, the uncompressed spring and the shape memory polymer hot melt are coated and mixed evenly, and the mass ratio of the spring and the shape memory polymer powder is 20% and 80% respectively; the uniformly mixed The material is cooled to 65-85°C, compressed to make a compression spring, and cooled to room temperature.

[0081] The compressed spring wire is granulated with a cutting granulator, and the size of the granulation is co...

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Abstract

The invention discloses a temperature-controlled shape memory blocking agent and a preparation method. The temperature-controlled shape memory blocking agent is shape memory granules; the shape memorygranules are prepared from springs and a temperature-sensitive shape memory polymer coating the springs, wherein the temperature-sensitive shape memory polymer is 20-99.99% of the shape memory granules, and the shape memory granules have the granule size of smaller than or equal to 8 mm. The preparation method comprises the following steps of (1) smashing, heating and melting the temperature-sensitive shape memory polymer into powder; (2) uniformly coating the temperature-sensitive shape memory polymer to the springs; (3) compressing and granulating after cooling. The springs are used as composite structures, and the temperature-sensitive shape memory polymer is adopted for bonding granulation. The blocking agent is added to cementing cement paste or drilling mud, and is excited by a suitable underground temperature increase environment, expands to increase the volume several times and utilizes the volume steric effect to achieve the purpose of sealing rock cracks.

Description

technical field [0001] The present invention relates to the technical field of leak prevention and / or plugging, and more particularly relates to a temperature-controlled shape memory plugging agent used for leak prevention and / or plugging in oil wells 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 e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13
CPCE21B33/13
Inventor 刘学鹏刘伟周仕明
Owner CHINA PETROLEUM & CHEM CORP
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