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Hydrophobic Modified Polyacrylamide Polymer Suitable as Supramolecular Shear Lifting Agent and Its Application in Water-based Drilling Fluid

A polyacrylamide, water-based drilling fluid technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of high flexibility, weakened rock-carrying performance, and the grid structure is not easy to recover again. , The effect of promoting the problem of drilling cuttings deposition

Active Publication Date: 2021-08-06
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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the molecular chains of high molecular polymers are long and flexible, and the molecular chains will be sheared and destroyed when passing through the water hole of the drill bit at a high shear rate, making it difficult for the grid structure to recover again, weakening its rock-carrying performance

Method used

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  • Hydrophobic Modified Polyacrylamide Polymer Suitable as Supramolecular Shear Lifting Agent and Its Application in Water-based Drilling Fluid
  • Hydrophobic Modified Polyacrylamide Polymer Suitable as Supramolecular Shear Lifting Agent and Its Application in Water-based Drilling Fluid
  • Hydrophobic Modified Polyacrylamide Polymer Suitable as Supramolecular Shear Lifting Agent and Its Application in Water-based Drilling Fluid

Examples

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preparation example Construction

[0034] A second aspect provides a method for preparing a hydrophobically modified polyacrylamide polymer suitable for a cutting agent, the method comprising:

[0035] (1) The compound represented by the formula (1'), the compound represented by the formula (3'), and the compound represented by the formula (4') are freed in an aqueous solvent in the presence of an oxidative-epoxy initiator base polymerization;

[0036] (2) in an aqueous solution of alkali metal hydroxide, hydrolyzing the product of the radical polymerization reaction to obtain a hydrophobically modified polyacrylamide polymer;

[0037] Wherein, the method makes the number-average molecular weight of the obtained hydrophobically modified polyacrylamide polymer to be 1 million-6.5 million;

[0038]

[0039] where R 1 , R 1' , R 2 , R 2' , R 3 , R 3' , R 5 , R 5' , R 5” , R 6 and R 6' Each is independently selected from H and C1-C6 alkyl; M is selected from H or alkali metal element; R 4 and R 4' ...

Embodiment 1

[0099] This example is used to illustrate the hydrophobically modified polyacrylamide polymer of the present invention and its preparation method.

[0100] (1) 380 mmol of acrylamide, 45 mmol of N-vinylpyrrolidone and 9.5 mmol of tetradecyldimethylallyl ammonium chloride (purchased from Annagy) were dissolved in 100 mL of deionized water under magnetic stirring, The oxygen was removed by passing nitrogen for 10 minutes, and 0.37 mmol potassium persulfate and 0.4 mmol sodium bisulfite were added, and the polymerization reaction was carried out at 25 °C for 6 hours to obtain a solid gel product;

[0101] (2) Cut the obtained solid gel-like product into pieces with scissors, add 100 mL of 1 mol / L sodium hydroxide solution, place it in a water bath at 90°C for 8 hours, and then dry and grind the obtained product to obtain a hydrophobically modified polymer Acrylamide polymer, denoted as supramolecular cutting agent SV-1.

[0102] It was determined that the number average molecula...

Embodiment 2

[0104] This example is used to illustrate the hydrophobically modified polyacrylamide polymer of the present invention and its preparation method.

[0105] According to the method described in Example 1, the difference is that an equimolar amount of cetyldimethylallyl ammonium chloride (purchased from Annagy) is used instead of cetyldimethylallyl ammonium chloride, and finally a hydrophobically modified polyacrylamide polymer is obtained, which is denoted as supramolecular cutting agent SV-2.

[0106] It was determined that the number average molecular weight of the hydrophobically modified polyacrylamide polymer was 5 million, and the molecular weight distribution index was 2.9.

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Abstract

The invention relates to the field of drilling in the petroleum industry, in particular to a hydrophobically modified polyacrylamide polymer suitable as a supramolecular cutting agent and its application in water-based drilling fluid. The structural units constituting the polymer are the structural units represented by the following formula (1), the structural units represented by the formula (2), the structural units represented by the formula (3), and the structural units represented by the formula (4); and The polymer has a number average molecular weight of 1 million to 6.5 million. The hydrophobically modified polyacrylamide polymer provided by the present invention has a supramolecular-like structure, and can provide a shearing agent with shear resistance and easy structure recovery by means of intermolecular electrostatic force, hydrogen bond, hydrophobic interaction, etc. .

Description

technical field [0001] The invention relates to the drilling field of the petroleum industry, in particular to a hydrophobically modified polyacrylamide polymer suitable for use as a supramolecular cutting agent and its application in water-based drilling fluid. Background technique [0002] Wells with complex structures are an important way to develop unconventional oil and gas. Complex-structure wells are advanced well types with horizontal wells as the basic feature. In the horizontal section of complex-structure wells, cuttings beds formed by incomplete cuttings carry are prone to occur, resulting in increased friction and sticking accidents during drilling. In order to improve the purification rate of wellbore in complex structure wells and carry cuttings more efficiently and thoroughly, the circulation return rate of drilling fluid can be increased, which puts forward higher requirements for the pump power of the mud pump, and increasing the return rate of drilling flu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F226/10C08F226/02C09K8/035
CPCC08F220/56C09K8/035C08F226/10C08F226/02
Inventor 邓宇蒋官澄马光长唐润平肖沣峰王凯杨丽丽罗宇峰漆梅葛清晓
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
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