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Copolymer, preparation method thereof, application of the copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid

A technology of oil-based drilling fluid and copolymer, applied in the field of oil-based drilling fluid

Active Publication Date: 2020-10-23
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the inability to efficiently solve the problem of downhole oil-based drilling fluid loss in the prior art, to provide a copolymer and its preparation method and its application as a plugging agent, as well as oil-based drilling fluid and its application. The copolymer provided by the invention can effectively solve the problem of downhole oil-based drilling fluid loss as a plugging agent, and can plug lost pores and fractures of different sizes

Method used

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  • Copolymer, preparation method thereof, application of the copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid
  • Copolymer, preparation method thereof, application of the copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid
  • Copolymer, preparation method thereof, application of the copolymer as plugging agent, oil-based drilling fluid and application of oil-based drilling fluid

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Experimental program
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Effect test

preparation example Construction

[0036] As previously mentioned, the second aspect of the present invention provides a method for preparing a copolymer, the method comprising the steps of:

[0037] In the presence of initiator, emulsifier and aqueous solvent, monomer A, monomer B, monomer C, monomer D and monomer E are subjected to emulsion polymerization; the monomer A is represented by formula (6) The monomer of structure, described monomer B is the monomer that has the structure shown in formula (7), and described monomer C is the monomer that has the structure shown in formula (8), and described monomer D is the monomer that has formula ( 9) The monomer of the shown structure, the monomer E is a monomer having the structure shown in formula (10); wherein, the monomer A, the monomer B, the monomer C, the monomer D and the monomer E The dosage makes in the prepared copolymer, the unit number of structural unit A is 2-20, the unit number of structural unit B is 1-30, the unit number of structural unit C is 1...

Embodiment approach

[0060] According to a preferred embodiment provided by the present invention, the preparation method of the copolymer specifically includes the following steps:

[0061] At room temperature, first mix monomer A, monomer B, monomer C, monomer D and monomer E, and then mix with the first emulsifier to obtain the outer phase; mix the aqueous solvent with the second emulsifier to obtain the inner phase ; The external phase is sheared in a high-speed shear emulsifier, and the internal phase is added to continue shearing during the shearing process, and an initiator is added to continue shearing to obtain an emulsion; then, under an inert atmosphere, under a water bath condition, the emulsion polymerization;

[0062] The monomer A is a monomer having a structure shown in formula (6), the monomer B is a monomer having a structure shown in formula (7), and the monomer C is a monomer having a structure shown in formula (8). A monomer, the monomer D is a monomer having a structure show...

Embodiment 1

[0087] This example is used to illustrate the copolymer of the present invention and its preparation method and plugging agent.

[0088] At normal temperature, each monomer styrene (monomer C), butyl acrylate (monomer A, R 1 for H, R 2 for -CH 2 CH 2 CH 2 CH 3 ), acrylonitrile (monomer E), 2-hydroxypropyl acrylate (monomer D), monomer B (R 3 Methyl) were mixed in a weight ratio of 4:4:1:0.5:0.5, Span 80 was added in an amount of 0.3wt% of the total amount of each monomer, and stirred at 50 rpm for 12 minutes to obtain an external phase.

[0089] At room temperature, take 100 g of deionized water, add Tween 80 in an amount of 4 wt% of the total amount of deionized water, and stir at 50 rpm for 12 minutes to obtain an internal phase.

[0090] At room temperature, pour the external phase into an emulsifier placed in an ice bath, shear at a high speed at 12000 rpm, pour the internal phase into the shearing process, and shear for 2 minutes; then add 0.3 wt% azobisisobutyroni...

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Abstract

The invention relates to the field of well drilling in the petroleum industry. The invention particularly relates to a copolymer, a preparation method thereof, application of the copolymer as a plugging agent, oil-based drilling fluid and application of the oil-based drilling fluid. The copolymer contains a structural unit A, a structural unit B, a structural unit C, a structural unit D and a structural unit E, wherein the structural unit A is a structural unit with a structure as shown in a formula (1), the structural unit B is a structural unit with a structure as shown in a formula (2), thestructural unit C is a structural unit with a structure as shown in a formula (3), the structural unit D is a structural unit with a structure as shown in a formula (4), and the structural unit E isa structural unit with a structure as shown in a formula (5); R1, R2 and R3 are each independently H or C1-C10 alkyl. When the copolymer provided by the invention is used as a plugging agent, the problem of leakage of underground oil-based drilling fluid can be efficiently solved, and leakage pores and cracks with different sizes can be plugged.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a copolymer and its preparation method, its application as a lost circulation agent, and oil-based drilling fluid and its application. Background technique [0002] In the process of exploration and development of oil and gas resources, we often face situations such as formation well wall instability and collapse, lost circulation, etc., resulting in prolonged drilling time, increased drilling costs, and even scrapped wellbore, resulting in huge economic losses. In the drilling of horizontal wells, the drilling fluid plays a very important role in the stability of the wellbore and the rate of penetration. The application of conventional water-based drilling fluids in horizontal wells is often limited due to problems such as temperature resistance, inhibition, and lubricity. , and oil-based drilling fluid does not have the problem of shale hydration expansion beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/10C08F220/18C08F220/14C08F220/44C08F220/20C09K8/44C09K8/035C09K8/32C09K8/36
CPCC08F212/10C08F220/14C09K8/035C09K8/32C09K8/36C09K8/426C09K8/44C08F220/1802C08F220/1804C08F220/44C08F220/20
Inventor 蒋官澄邓正强贺垠博杨丽丽董腾飞孙金声彭春耀罗绪武赵利黄贤斌刘敬平白杨伍贤柱马光长张坤覃勇高德利
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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