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Plugging agent, preparation method and application thereof

A plugging agent and plugging slurry technology, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of affecting the rheological properties of cement slurry, limiting the plugging effect of fiber plugging slurry, and slow fiber speed, etc.

Inactive Publication Date: 2017-04-05
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 less than 5‰ (accounting for the amount of cement), which limits the use of fiber plugging slurry. Plugging effect

Method used

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  • Plugging agent, preparation method and application thereof
  • Plugging agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of Styrene-Butadiene Copolymer Based Oil Well Cement with Shape Memory Particles, Cement Slurry and Cement Stone Module

[0038] A styrene-butadiene shape-memory polymer whose shape-memory deformation temperature is 55-60° C. is crushed into 30-100 mesh shape-memory polymer powder by cryogenic freezing.

[0039] The fiber is 50% each of polypropylene fiber (polypropylene fiber) and polyvinyl chloride fiber (polyvinyl chloride fiber).

[0040] Mix 50% fiber and shape-memory polymer powder with a high-speed mixer; granulate the mixed material with an extrusion granulator, and set the temperature at 55-75 ℃; the size of extrusion granulation is controlled to be less than or equal to 3mm in diameter and length, such as 0.5mm, 1mm, 2mm and 3mm, so as to facilitate mixing. Figures before and after deformation of shape memory particles are shown in figure 1 and figure 2 .

[0041] Weigh 100 parts by mass of oil well cement, shape memory particles accounting fo...

Embodiment 2

[0044] Preparation of shape memory particles, cement paste and cement stone modules for oil well cement based on polyurethane copolymer

[0045] A polyurethane shape-memory polymer whose shape-memory deformation temperature is 65-70 DEG C is crushed into 100-200-mesh shape-memory polymer powder by low-temperature freezing.

[0046] The fibers are 30% glass fiber, 35% basalt fiber and 35% carbon fiber.

[0047] 80% and 20% fiber and shape memory polymer powder are mixed uniformly with a high-speed mixer; the uniformly mixed material is granulated with an extrusion granulator, and the temperature during extrusion granulation is set to 65-85°C; the size of extrusion granulation is controlled so that the diameter and length are less than or equal to 3mm, such as 0.5mm, 1mm, 2mm and 3mm, so as to facilitate mixing.

[0048] Weigh 100 parts by mass of oil well cement, 2% shape memory particles (that is, 2 parts by mass) accounting for the mass of cement, and 44 parts by mass of wat...

Embodiment 3

[0051] 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

[0052] A polyvinyl acetal gel with a shape memory deformation temperature of 65-70 DEG C and an ethylene-vinyl acetate copolymer are cryopreserved and pulverized into 100-300 meshes.

[0053] The fibers are 35% basalt fiber, 35% carbon fiber and 30% polypropylene fiber.

[0054] 20% and 80% fiber and shape memory polymer powder are mixed uniformly with a high-speed mixer; the uniformly mixed material is granulated with an extrusion granulator, and the temperature during extrusion granulation is 65- 85°C; the size of the extrusion granulation is controlled to be less than or equal to 8mm in diameter and length, such as 0.5mm, 1mm, 2mm, 3mm, 5mm and 8mm, so as to facilitate mixing.

[0055] Weigh 100 parts by mass of oil well cement, 1% shape memory particles (that is, 1 part by mass) accounting for the mass...

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Abstract

The invention relates to the field of leakage-proof, and especially relates to a plugging agent for leakage-proof and / or leakage plugging in oil wells, and a preparation method of the plugging agent. The plugging agent includes a shape memory granule and plugging slurry. The shape memory granule includes a shape memory polymer. By means of the shape memory granule, a problem of aggregation of a solvent after addition of fibers is solved; meanwhile, the plugging agent is effective in leakage-proof and / or leakage plugging.

Description

technical field [0001] The invention relates to the field of leak prevention and / or plugging, in particular to a plugging agent 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 and poor cementing quality, 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, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46
CPCC09K8/46C09K2208/08
Inventor 张明昌刘学鹏张林海周仕明刘伟
Owner CHINA PETROLEUM & CHEM CORP
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