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Hydrophobic modification polyacrylamide polymer as supermolecule shearing strength improving agent and application in water-based drilling fluid

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

Active Publication Date: 2019-11-01
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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  • 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 modification polyacrylamide polymer as supermolecule shearing strength improving agent and application in water-based drilling fluid
  • Hydrophobic modification polyacrylamide polymer as supermolecule shearing strength improving agent and application in water-based drilling fluid
  • Hydrophobic modification polyacrylamide polymer as supermolecule shearing strength improving agent and application in water-based drilling fluid

Examples

Experimental program
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preparation example Construction

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

[0035] (1) In an aqueous solvent, in the presence of an oxidation-epoxy initiator, the compound represented by the formula (1'), the compound represented by the formula (3') and the compound represented by the formula (4') are freely radical polymerization;

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

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

[0038]

[0039] Among them, R 1 , R 1' , R 2 , R 2' , R 3 , R 3' , R 5 , R 5' , R 5” , R 6 and R 6' Each independently selected from H and C1-C6 alkyl; M selected from H or alka...

Embodiment 1

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

[0100] (1) Under magnetic stirring, 380 mmol of acrylamide, 45 mmol of N-vinylpyrrolidone and 9.5 mmol of tetradecyldimethylallyl ammonium chloride (purchased from Anaiji Company) were dissolved in 100 mL of deionized water, Nitrogen gas was passed for 10 minutes to remove oxygen, 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-like 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, 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 mole...

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 the hexadecyldimethylallyl ammonium chloride (purchased from Anaiji Company) of an equimolar amount is used to replace tetradecyldimethylallyl ammonium chloride to finally obtain a hydrophobically modified polyacrylamide polymer, 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 well drilling of the petroleum industry and in particular to a hydrophobic modification polyacrylamide polymer as a supermolecule shearing strength improving agent and application in a water-based drilling fluid. Structure units forming the polymer are a structure unit of a formula (1) shown in the specification, a structure unit of a formula (2) shown in thespecification, a structure unit of a formula (3) shown in the specification and a structure unit of a formula (4) shown in the specification; and the number-average molecular weight of the polymer is1-6.5 million. The hydrophobic modification polyacrylamide polymer provided by the invention has a supermolecule-like structure, and a shearing strength improving agent with properties of shearing resistance and easily recovered structures can be provided by virtue of electrostatic force, hydrogen bonds, hydrophobic effects and the like of supermolecules.

Description

technical field [0001] The invention relates to the field of drilling in the petroleum industry, in particular to a hydrophobically modified polyacrylamide polymer suitable for use as a supramolecular shear-lifting agent and its application in water-based drilling fluids. Background technique [0002] Complex structure wells are an important way to develop unconventional oil and gas at present. Complex structure wells are advanced well types that are basically characterized by horizontal wells. In the horizontal section of complex structure wells, cuttings beds are prone to occur due to incomplete cuttings carrying, resulting in increased friction and pipe sticking during drilling. In order to improve the borehole purification rate of complex structure wells and carry cuttings more efficiently and thoroughly, the drilling fluid circulation return speed can be increased, which puts forward higher requirements on the pump power of the mud pump, and increasing the drilling flui...

Claims

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Application Information

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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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