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Volume expansion type efficient slug gel plugging agent and preparation method thereof

A plugging agent and volume-expanding technology, which is applied in the field of drilling fluid plugging, can solve the problems of undetermined temperature conditions and time range, poor water absorption and swelling performance of gel, and narrow application range of plugging agent temperature, etc., to achieve The gelling temperature can adapt to a wide range of conditions, the gelling time can be adjusted, and the plugging effect is good

Active Publication Date: 2021-06-01
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature application range of the plugging agent of this invention is narrow, and the temperature conditions and time range for the self-cementation of the plugging agent have not been determined; the gel formed at the formation temperature has poor water absorption and expansion properties, and the gel plugging after gelation The agent has weak elasticity and toughness, and the pressure-bearing plugging strength is low

Method used

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  • Volume expansion type efficient slug gel plugging agent and preparation method thereof
  • Volume expansion type efficient slug gel plugging agent and preparation method thereof
  • Volume expansion type efficient slug gel plugging agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] A volume-expanding high-efficiency slug gel plugging agent, which is prepared from the following raw materials in parts by mass: 25 parts of a polymerization reaction agent, 2 parts of a crosslinking agent, 0.08 parts of a temperature-appropriate initiator, and 4 parts of a water-soluble resin toughening agent 4 parts, 4 parts of composite inorganic toughening agent, 4 parts of modified starch, 6 parts of body swelling reaction agent, 4 parts of rheology modifier.

[0062] The polymerization reactant is composed of 2 (methylamino) ethyl methacrylate, N-N dimethylbisacrylamide and methylene succinic acid, of which 2 (methylamino) ethyl methacrylate, N-N dimethyl bisacrylamide The mass ratio of acrylamide to methylene succinic acid is 4:4:1.

[0063] The crosslinking agent is composed of methylolacrylamide and glutaraldehyde, wherein the mass ratio of methylolacrylamide and glutaraldehyde is 2:1.

[0064] The temperature-appropriate initiator is selected from the low-tem...

Embodiment 2

[0083] A volume-expanding high-efficiency slug gel plugging agent, prepared from the following raw materials in parts by mass: 25 parts of a polymerization reaction agent, 2 parts of a crosslinking agent, 0.1 part of a temperature-appropriate initiator, and 4 parts of a water-soluble resin toughening agent 4 parts, 4 parts of composite inorganic toughening agent, 4 parts of modified starch, 6 parts of body swelling reaction agent, 4 parts of rheology regulator.

[0084] The polymerization reactant is composed of 2 (methylamino) ethyl methacrylate, N-N dimethylbisacrylamide and 2-acrylamido-2-methylpropanesulfonic acid, in which 2 (methylamino) ethyl methacrylate The mass ratio of ester, N-N dimethylbisacrylamide and 2-acrylamido-2-methylpropanesulfonic acid is 2:2:1.

[0085] The crosslinking agent is composed of methylolacrylamide and glutaraldehyde, wherein the mass ratio of methylolacrylamide and glutaraldehyde is 2:1.

[0086] The moderate-temperature initiator is azodiis...

Embodiment 3

[0098] A volume-expanding high-efficiency slug gel plugging agent, which is prepared from the following raw materials in parts by mass: 25 parts of a polymerization reaction agent, 2 parts of a crosslinking agent, 0.08 parts of a temperature-appropriate initiator, and 4 parts of a water-soluble resin toughening agent 4 parts, 4 parts of composite inorganic toughening agent, 4 parts of modified starch, 6 parts of body swelling reaction agent, 4 parts of rheology modifier.

[0099] The polymerization reactant is composed of 2 (methylamino) ethyl methacrylate, N-N dimethylbisacrylamide and methylene succinic acid, of which 2 (methylamino) ethyl methacrylate, N-N dimethyl bisacrylamide The mass ratio of acrylamide to methylene succinic acid is 4:4:1.

[0100] The crosslinking agent is glutaraldehyde.

[0101] The moderate temperature initiator is selected as high temperature initiator tert-butyl hydroperoxide, and the corresponding polymerization reaction temperature is 105°C.

...

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Abstract

The invention provides a volume expansion type efficient slug gel plugging agent and a preparation method thereof. The volume expansion type efficient slug gel plugging agent is prepared from the following raw materials in parts by mass: 10-35 parts of a polymerization reaction agent, 1-3 parts of a cross-linking agent a, 0.02-0.5 part of a suitable-temperature initiator, 0.5-5 parts of a water-soluble resin flexibilizer, 0.5-5 parts of a composite inorganic flexibilizer, 2-8 parts of modified starch, 2-10 parts of a volume expansion reaction agent and 2-8 parts of a rheological modifier, wherein the volume expansion reaction agent is prepared from the following raw materials through an inverse emulsion polymerization method: a water-soluble polymeric monomer, a dispersion medium, an emulsifier, an oil-phase initiator and a cross-linking agent b. The plugging agent disclosed by the invention has the advantages of capability of underground crosslinking gel forming, flexible and adjustable gel forming time, high pressure bearing capacity after gel forming, relatively high water absorption expansibility, excellent mechanical strength after water absorption and the like.

Description

technical field [0001] The invention relates to a body-expanding high-efficiency slug gel plugging agent and a preparation method thereof, belonging to drilling fluid plugging technology in the field of petroleum exploration and development. Background technique [0002] Lost circulation is defined as the effect of the working fluid (such as drilling fluid, cement slurry, completion fluid or other liquids, etc.) A downhole complex situation in which a large amount of inflow into the formation (percolation filtrate is not included) is one of the most common and common technical problems in oil drilling engineering. In lost circulation, fractured and karst caves account for a high proportion. When drilling in fractured zones and unconformity formations, the above-mentioned types of lost circulation are very likely to occur. If the tiny pores in the formation will not cause lost circulation, but due to some improper measures taken such as making the wellbore pressure greater t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C08F120/06C08F2/32
CPCC09K8/426C08F120/06C08F2/32C09K2208/10
Inventor 吕开河王晨烨白英睿孙金声郝惠军王金堂刘凡金家锋张洁刘敬平黄贤斌
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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