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Polymer elastic particle reservoir protection agent and its preparation method and application

A reservoir protective agent and reservoir technology are applied in the field of reservoir protective agent intermediate products, reservoir protective agent and its preparation, and drilling fluid fields, which can solve the problems of poor plugging effect and unsatisfactory plugging effect, and achieve Excellent reservoir protection performance, improving reservoir protection ability and overcoming poor adaptability

Active Publication Date: 2018-10-16
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, calcium carbonate, as a reservoir protection agent, has the following problems: (1) calcium carbonate is a rigid particle, and the plugging effect is not ideal when used alone, so it must be used together with deformable particles such as asphalt; (2) calcium carbonate enters the reservoir For the internal plugging of pores, the diameter of the particles must be strictly matched with the diameter of the reservoir pores, otherwise the plugging effect will not be good; (3) Calcium carbonate enters the internal plugging of the reservoir pores, and acidification and plugging removal must be carried out after drilling and completion to remove the plugging , so that the reservoir permeability can be restored, and the oil and gas wells can produce normally

Method used

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  • Polymer elastic particle reservoir protection agent and its preparation method and application
  • Polymer elastic particle reservoir protection agent and its preparation method and application
  • Polymer elastic particle reservoir protection agent and its preparation method and application

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preparation example Construction

[0029] In the second aspect, the present invention provides a method for preparing the intermediate product of the reservoir protective agent, the method comprising: mixing acrylamide, cationic monomer, crosslinking agent, toughening material and water, and adding to the resulting mixture The initiator reacts, and then the reaction product is dried and crushed.

[0030] Preferably, the method of mixing acrylamide, cationic monomer, crosslinking agent, toughening material, and water includes: (1) adding acrylamide, cationic monomer and crosslinking agent to water to dissolve, and stirring uniformly; (2) (1) Add the toughening material to the mixture of step (1) and stir it evenly; (3) stir the mixture of step (2) under a protective atmosphere. Wherein, the protective atmosphere may be nitrogen and / or inert gas, and the stirring time in step (3) may be 20-30 min.

[0031] Preferably, the reaction conditions include: a temperature of 30-60° C. and a time of 3-5 h. After the reaction...

Embodiment 1

[0049] Add 20kg of acrylamide, 4kg of dimethyldiallylammonium chloride and 0.01kg of N,N'-methylenebisacrylamide into 67.96kg of water to fully dissolve, then add 8kg of bentonite and stir well. The above reaction liquid was added to a reactor equipped with a stirrer, condenser, and thermometer, protected by nitrogen, stirred for 20 minutes, then adjusted the temperature to 60°C, added 0.03kg of ammonium persulfate, stopped nitrogen flow and stirring, and reacted 3h; Take out the reaction product, dry it at 105°C for 15h, and pulverize to obtain a granular intermediate product of the reservoir protective agent.

[0050] Take 10kg of intermediate product and 5kg of sodium carbonate, add 79.95kg of water and stir continuously for 10h, then add 5kg of sodium chloride and 0.05kg of octadecyltrimethylammonium chloride, continue to stir for 0.5h to obtain polymer elastic particle reservoir protection Agent.

[0051] The drilling fluid was prepared according to the following formula: 2% ...

Embodiment 2

[0053] Add 25kg of acrylamide, 5kg of methacryloyloxyethyl trimethylammonium chloride and 0.02kg of glutaraldehyde into 59.93kg of water to fully dissolve, then add 10kg of starch and stir well. The above reaction liquid was added to a reactor equipped with a stirrer, condenser, and thermometer, protected by nitrogen, stirred for 30 minutes, then adjusted the temperature to 50°C, added 0.05kg potassium persulfate, stopped nitrogen flow and stirring, and reacted 4h: Take out the reaction product, dry it at 110°C for 12h, and pulverize to obtain a granular intermediate product of the reservoir protective agent.

[0054] Take 20 kg of the intermediate product, 3 kg of potassium hydroxide and 0.3 kg of cetyl pyridinium chloride, add 69.7 kg of water and continue stirring for 10 hours, then add 7 kg of potassium chloride and continue stirring for 1 hour to obtain a polymer elastic particle reservoir protective agent.

[0055] The drilling fluid was prepared according to the method of Ex...

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Abstract

The invention relates to the field of petroleum drilling technology, and discloses a reservoir protection agent intermediate product, a reservoir protection agent and its preparation method and application, drilling fluid and its application. The reservoir protection agent intermediate product is composed of acrylamide, cationic mono body, crosslinking agent, initiator, toughening material and water, and based on 100 parts by weight of the raw material, the amounts of acrylamide, cationic monomer, crosslinking agent, initiator, toughening material are respectively 8-30, 1-10, 0.01-0.5, 0.01-0.1, 5-25 parts by weight. The reservoir protection agent includes the intermediate product, alkali, salt and water of the present invention, and based on 100 parts by weight of the reservoir protection agent, the consumption of the intermediate product, alkali and salt are respectively 5-40, 1-10 , 1-12 parts by weight. The reservoir protection agent of the invention has good plugging effect, can improve the reservoir protection ability of the drilling fluid, and enhance the ability of the drilling fluid to stabilize the borehole wall.

Description

Technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a reservoir protective agent intermediate product, a reservoir protective agent, a preparation method and application thereof, and a drilling fluid and application thereof. Background technique [0002] Once reservoir damage occurs during the oil drilling process, it will reduce the permeability of the reservoir, increase the resistance to oil and gas flow, and at least reduce the productivity of oil and gas wells, affect the accuracy of well testing and logging interpretation, and cause misdiagnosis and leakage in severe cases. Reservoir, causing significant economic losses. Therefore, it is very important to protect the reservoir during drilling. [0003] During the drilling process, the drilling fluid can easily invade the pores of the reservoir and cause the permeability of the reservoir to decrease through the effects of particle blockage and / or water sensitivity, and d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/02C08F220/34C08F222/38C08F212/36C08F2/44C09K8/035C09K8/03C09K8/24C09K8/42C09K8/512
CPCC08F2/44C08F220/56C08F226/02C09K8/03C09K8/035C09K8/24C09K8/426C09K8/512C09K8/887C09K8/90C09K2208/06C08F222/385C08F220/34C08F212/36C09K8/5045C09K8/508
Inventor 吕开河孙金声刘敬平
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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