Reservoir protection agent intermediate product, reservoir protection agent, preparation methods and applications thereof, as well as drilling fluid and application thereof

A reservoir protection agent and drilling fluid technology, applied in the field of oil drilling, can solve problems such as poor plugging effect and unsatisfactory plugging effect, achieve excellent reservoir protection performance, improve reservoir protection ability, and good environmental protection performance Effect

Active Publication Date: 2017-03-29
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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  • Reservoir protection agent intermediate product, reservoir protection agent, preparation methods and applications thereof, as well as drilling fluid and application thereof
  • Reservoir protection agent intermediate product, reservoir protection agent, preparation methods and applications thereof, as well as drilling fluid and application thereof
  • Reservoir protection agent intermediate product, reservoir protection agent, preparation methods and applications thereof, as well as drilling fluid and application thereof

Examples

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preparation example Construction

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

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

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

Embodiment 1

[0049] Add 20kg of acrylamide, 4kg of dimethyl diallyl ammonium chloride and 0.01kg of N,N'-methylenebisacrylamide into 67.96kg of water, fully dissolve, then add 8kg of bentonite, and stir evenly. Add the above-mentioned reaction solution into the reactor equipped with a stirrer, a condenser, and a thermometer, pass through nitrogen protection, stir for 20 minutes, then adjust the temperature to 60°C, add 0.03kg of ammonium persulfate, stop nitrogen and stirring, and react 3h; the reaction product was taken out, dried at 105°C for 15h, and pulverized to obtain an intermediate product of granular reservoir protection 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, 0.05kg of octadecyltrimethylammonium chloride, and continue stirring for 0.5h to obtain the polymer elastic particle reservoir protection agent.

[0051] Drilling fluid was prepared according to the fo...

Embodiment 2

[0053] Add 25kg of acrylamide, 5kg of methacryloyloxyethyltrimethylammonium chloride and 0.02kg of glutaraldehyde into 59.93kg of water, fully dissolve, then add 10kg of starch, and stir evenly. Add the above-mentioned reaction solution into the reactor equipped with a stirrer, a condenser, and a thermometer, pass through nitrogen protection, stir for 30 minutes, then adjust the temperature to 50°C, add 0.05kg of potassium persulfate, stop nitrogen and stirring, and react 4h; the reaction product was taken out, dried at 110°C for 12h, and pulverized to obtain an intermediate product of granular reservoir protection agent.

[0054] Take 20kg of intermediate product, 3kg of potassium hydroxide, and 0.3kg of hexadecylpyridinium chloride, add to 69.7kg of water and stir continuously for 10h, then add 7kg of potassium chloride, and continue stirring for 1h to obtain a polymer elastic particle reservoir protection agent.

[0055] The drilling fluid was prepared according to the meth...

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Abstract

The invention relates to the technical field of petroleum drilling, and discloses a reservoir protection agent intermediate product, a reservoir protection agent, preparation methods and applications thereof, as well as drilling fluid and an application thereof. The reservoir protection agent intermediate product is prepared by the following raw materials: acrylamide, a cationic monomer, a cross-linking agent, an initiator, a toughening material and water, based on 100 parts by weight of the raw materials, the raw materials comprise the following components in parts by weight: 8-30 parts of acrylamide, 1-10 parts of the cationic monomer, 0.01-0.5 parts of the cross-linking agent, 0.01-0.1 parts of the initiator, and 5-25 parts of the toughening material. The reservoir protection agent comprises the intermediate product, alkali, salt and water, based on 100 parts by weight of the reservoir protection agent, the reservoir protection agent comprises 5-40 parts by weight of the intermediate product, 1-10 parts of alkali, and 1-12 parts by weight of salt. The reservoir protection agent has good sealing effects, improves reservoir protection capability of drilling fluid, and enhances capability of drilling fluid for stabilization of borehole walls.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to an intermediate product of a reservoir protection agent, a reservoir protection agent and its preparation method and application, and a drilling fluid and its application. Background technique [0002] Once reservoir damage occurs during oil drilling, it will reduce the permeability of the reservoir, increase the oil and gas flow resistance, reduce the productivity of oil and gas wells, affect the accuracy of well testing and logging interpretation, and lead to misdiagnosis and omissions in severe cases. reservoirs, resulting in significant economic losses. Therefore, it is very important to protect the reservoir during drilling. [0003] During the drilling process, the drilling fluid easily invades the pores of the reservoir, and the permeability of the reservoir is reduced through particle blockage and / or water sensitivity, which damages the reservoir. During the ...

Claims

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Application Information

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Patent Type & Authority Applications(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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