Unlock instant, AI-driven research and patent intelligence for your innovation.

Acrylamide polymer inverse emulsion and its application as supramolecular coating agent in water-based drilling fluid

A water-based drilling fluid and acrylamide technology, which is applied in the field of oil and gas drilling, can solve the problems of easy destruction of molecular chains, limit the adsorption and coating performance of shale, etc., and achieve the effects of excellent temperature resistance and simplified procedures.

Active Publication Date: 2021-07-13
中国石油集团川庆钻探工程有限公司钻井液技术服务公司 +1
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular chains of commonly used polymers are easily destroyed at high temperatures, which greatly limits their adsorption and coating performance on shale.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acrylamide polymer inverse emulsion and its application as supramolecular coating agent in water-based drilling fluid
  • Acrylamide polymer inverse emulsion and its application as supramolecular coating agent in water-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] The second aspect of the present invention provides a method for preparing an acrylamide polymer suitable for a coating agent, the method comprising:

[0033](1) providing an aqueous mixture containing a compound shown in formula (1'), a compound shown in formula (2'), a compound shown in formula (3') and a compound shown in formula (4');

[0034] (2) providing an oily mixture containing an emulsifier and an oil;

[0035] (3) shear emulsifying the water-containing mixture and the oil-containing mixture to obtain the first emulsion, then introduce an initiator, and carry out inverse emulsion polymerization;

[0036] Wherein, the method makes the obtained acrylamide polymer have a number average molecular weight of 200,000-2 million;

[0037] Formula 1') Formula (2') Formula (3') Formula (4')

[0038] Among them, R 1 , R 1' , R 3 , R 3' , R 5 , R 6 , R 6' , R 7 , R 7' and R 7” each independently selected from H and C1-C6 alkyl; R 2 , R 2' and R 4 Ea...

Embodiment 1

[0090] This example is used to illustrate the acrylamide polymer inverse emulsion of the present invention and its preparation method.

[0091] (1) Dissolve 28g of acrylic acid in 200g of water, stir for 1-2 minutes, then add potassium hydroxide to adjust the pH to 7, and stir for 5 minutes; then add 24g of N,N-dimethylacrylamide and stir for 3 minutes, Make it fully dissolved, then add 23g of N,N-dimethyldiallylammonium chloride and stir for 2 minutes, then add 6g of N-vinylpyrrolidone, stir evenly, and the aqueous mixture of monomers can be obtained;

[0092] (2) 60g 5# white oil and 19g emulsifier Span 80 were mixed and stirred for 20 minutes, so that the emulsifier was dissolved evenly to obtain the oily mixture of the emulsifier;

[0093] (3) Mix the aqueous mixture of the monomer and the oily mixture of the emulsifier, and shear and emulsify for 3 minutes in a shear emulsifier, then add 0.2g initiator azobisisobutyronitrile in the emulsion, and then shear Emulsify for 2...

Embodiment 2

[0095] This example is used to illustrate the acrylamide polymer inverse emulsion of the present invention and its preparation method.

[0096] (1) Dissolve 22g of acrylic acid in 200g of water, stir for 1-2 minutes, then add potassium hydroxide to adjust the pH to 7, and stir for 5 minutes; then add 28g of N,N-dimethylacrylamide and stir for 3 minutes, Make it fully dissolved, then add 26g of N,N-dimethyldiallylammonium chloride and stir for 2 minutes, then add 8g of N-vinylpyrrolidone, and stir evenly to obtain an aqueous mixture of monomers;

[0097] (2) 70g 5# white oil and 27g emulsifier Span 80 were mixed and stirred for 20 minutes, so that the emulsifier was dissolved evenly to obtain the oily mixture of the emulsifier;

[0098] (3) Mix the aqueous mixture of the monomer and the oily mixture of the emulsifier, and shear emulsify in a shear emulsifier for 3 minutes, then add 0.3g initiator azobisisoheptanonitrile to the emulsion, and then shear emulsify 2 minutes; then ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to the field of oil and gas drilling, in particular to an acrylamide polymer inverse emulsion and its application as a supramolecular coating agent in water-based drilling fluid. The structural unit of the acrylamide polymer is composed of a structural unit shown in formula (1), a structural unit shown in formula (2), a structural unit shown in formula (3) and a structural unit shown in formula (4) ; The number average molecular weight of the acrylamide polymer is 200,000-2 million. When the acrylamide polymer inverse emulsion obtained in the invention is used as a coating agent, it has excellent temperature resistance and can be used in high-temperature shale formations.

Description

technical field [0001] The invention relates to the field of oil and gas drilling, in particular to an acrylamide polymer inverse emulsion and its application as a supramolecular coating agent in water-based drilling fluid. Background technique [0002] In the process of exploration and development of shale oil and gas with water-based drilling fluid, wellbore instability caused by mud shale hydration, and drilling fluid viscosity sharply increased due to hydration and dispersion of shale cuttings, resulting in drilling difficulties And other issues. Therefore, controlling the hydration dispersion of shale is a key technical problem for water-based drilling fluids to drill into shale formations. In response to this problem, researchers have given solutions from three different angles, namely shale inhibitors, shale plugging agents and shale coating agents. Shale inhibitors are generally inorganic salts and organic small molecules, such as potassium chloride (KCl), small ca...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/54C08F226/02C08F226/10C08F2/32C09K8/035
CPCC08F2/32C08F220/06C08F220/54C08F226/02C09K8/035C09K2208/12C08F226/10
Inventor 马光长蒋官澄王凯肖沣峰邓宇覃勇杨丽丽李新亮史赫张坤谢显涛王敏
Owner 中国石油集团川庆钻探工程有限公司钻井液技术服务公司