Ionic liquid-based efficient flocculating agent for drilling fluid

A technology of ionic liquid and water-based drilling fluid, which is applied in the field of oil and gas drilling, can solve the problems of poor flocculation effect of submicron cuttings and inferior soil, and the inability to efficiently remove submicron cuttings and inferior soil, so as to promote reuse , resource utilization long-term, good effect

Active Publication Date: 2020-04-21
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, partially hydrolyzed polyacrylamide has poor flocculation effect on hydrated and dispersed submicron cuttings and inferior soil, and cannot achieve the purpose of efficiently removing submicron cuttings and inferior soil

Method used

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  • Ionic liquid-based efficient flocculating agent for drilling fluid
  • Ionic liquid-based efficient flocculating agent for drilling fluid
  • Ionic liquid-based efficient flocculating agent for drilling fluid

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preparation example Construction

[0039] The second aspect of the present invention provides a method for preparing an acrylamide copolymer suitable for use as a flocculant or its hydrolyzate, the method comprising: in the presence of an initiator, in an aqueous solvent, the The monomer and the imidazole ionic liquid carry out a copolymerization reaction; the cationic part of the imidazole ionic liquid has a structure shown in formula (2');

[0040]

[0041] Among them, R 11 -R 13 , R 21 -R 23 and R 3 -R 5 each independently selected from H and C1-C6 alkyl; R 6 Alkyl selected from C1-C6; L 1 is a link or a C1-C6 alkylene group.

[0042] According to the present invention, R 11 -R 13 , R 21 -R 23 , R 3 -R 5 and L 1 As introduced above, details will not be repeated here.

[0043] According to the present invention, the monomer represented by the formula (1') will provide the structural unit represented by the formula (1) described above for the obtained acrylamide copolymer, and the cationic pa...

Embodiment 1

[0074] This example is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0075] Add 282mmol of acrylamide and 29mmol of vinylimidazole ionic liquid VM1 (purchased from Lanzhou Zhongke Kite Technology Industry and Trade Co., Ltd.) into 100mL of deionized water, and stir for 10 minutes to dissolve. Nitrogen gas was slowly introduced for 10 minutes, followed by adding 0.35 mmol of potassium persulfate and 0.35 mmol of sodium bisulfite, and reacted at 60°C for 5 hours to obtain a gel-like product, which was then dried and ground to obtain acrylamides Copolymer as flocculant PAV-1.

[0076] The weight average molecular weight of the acrylamide-based copolymer was 2.6 million g / mol.

Embodiment 2

[0078] This example is used to illustrate the acrylamide copolymer of the present invention and its preparation method.

[0079] Add 211mmol of acrylamide and 58mmol of vinylimidazole ionic liquid VM1 (purchased from Lanzhou Zhongke Kite Technology Industry and Trade Co., Ltd.) into 100mL of deionized water, and stir for 10 minutes to dissolve. Nitrogen gas was slowly introduced for 10 minutes, followed by adding 0.37mmol of potassium persulfate and 0.48mmol of sodium bisulfite, and reacted at 50°C for 6h to obtain a gel-like product, which was then dried and ground to obtain acrylamides Copolymer as flocculant PAV-2.

[0080] The weight average molecular weight of the acrylamide copolymer is 3.5 million g / mol.

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Abstract

The invention relates to the field of oil and gas drilling, in particular to a flocculating agent for a drilling fluid. An acrylamide copolymer is composed of an acrylamide structural unit and an imidazole ionic liquid structural unit, the acrylamide structural unit has a structure shown in a formula (1), and the imidazole ionic liquid structural unit has a cationic structure shown in a formula (2). The acrylamide copolymer or hydrolysate thereof provided by the invention can effectively solve the problems of high solid phase content, difficult maintenance and the like of the drilling fluid when being used as a water-based drilling fluid flocculant, and has long-term practical value and economic benefit for further promoting repeated utilization and resource utilization of the drilling fluid and promoting safe and environment-friendly development of an oil field.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to a flocculant for drilling fluid. Background technique [0002] During the drilling process, due to the accumulation of cuttings at the bottom of the well and the hydration and dispersion of low-quality soil such as mud shale, the solid phase content of the drilling fluid will become higher and higher, especially the submicron cuttings and low-quality soil in the drilling fluid. Since most of the particles are below 2 μm, the solid control equipment cannot effectively remove them, and these useless submicron solid phases will increase the viscous shear force of the drilling fluid, deteriorate the rheological properties of the drilling fluid, reduce the ROP, and increase the drilling cost. At present, the commonly used methods to control the solid phase content mainly include the following: [0003] ①Sedimentation method: After the drilling fluid is circulated to the surface, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F226/06C09K8/035C09K8/24
CPCC08F220/56C09K8/035C09K8/24C08F226/06Y02P20/54
Inventor 蒋官澄李新亮杨丽丽李公让孙金声彭春耀白杨刘敬平黄贤斌罗绪武马光长伍贤柱郭永宾李中
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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