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Comb polyurethane lubricant and water-based drilling fluid

A polyurethane and lubricant technology, applied in the field of oil drilling, can solve the problems of few adsorption anchor points, difficulty in meeting the design requirements for lubrication effect, and inability to form a strong adsorption film, so as to improve the strength of the extreme pressure film and improve the stability of cycle use , long-lasting effect of lubrication

Active Publication Date: 2021-11-23
CNPC BOHAI DRILLING ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the two lubricants only contain a small amount of polar adsorption groups in the molecular chain, and they are not on the same plane, which inevitably leads to the fact that the polar groups have few adsorption anchor points on the friction surface, and cannot form a strong adsorption film. The effect is difficult to meet the design requirements

Method used

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  • Comb polyurethane lubricant and water-based drilling fluid
  • Comb polyurethane lubricant and water-based drilling fluid
  • Comb polyurethane lubricant and water-based drilling fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of comb polyurethane lubricant, it is prepared by following method:

[0026] S1. Weigh 1.5 mol of diisocyanate A (O=C=N-(CH 2 ) 4 -N=C=O) and 1mol of coconut oil monoglyceride; then diisocyanate A is added to the reaction flask and the temperature is raised to 70°C, and under stirring, coconut oil fatty acid monoglyceride is added dropwise to the reaction flask In, continue constant temperature stirring 10h, obtain unblocked polyurethane;

[0027] S2. Increase the reaction temperature to 110° C., drop excess 3 mol of methanol into the reaction product obtained in step S1, continue stirring at constant temperature for 6 hours after the dropwise addition, and then naturally cool to room temperature to obtain a methyl-terminated polyurethane crude product;

[0028] S3. Carrying out rotary evaporation under reduced pressure on the crude polyurethane product obtained in step S2 to remove unreacted methanol to obtain comb-shaped ester-soluble polyurethane; after test...

Embodiment 2

[0031] A kind of comb polyurethane lubricant, it is prepared by following method:

[0032] S1. Weigh 1.6 mol of diisocyanate B (O=C=N-(CH 2 ) 6 -N=C=O) and 1 mol of soybean oleic acid monoglyceride; then diisocyanate B was added to the reaction flask and the temperature was raised to 80°C, and under stirring conditions, coconut oil fatty acid monoglyceride was added dropwise to the reaction flask In, continue constant temperature stirring 5h, obtain unblocked polyurethane;

[0033] S2. Increase the reaction temperature to 120° C., drop excess 2.8 mol of methanol into the reaction product obtained in step S1, continue stirring at a constant temperature for 4 hours after the addition is completed, and then naturally cool to room temperature to obtain a methyl-terminated polyurethane crude product ;

[0034] S3. Rotate the crude polyurethane product obtained through step S2 to remove unreacted methanol to obtain comb-shaped ester-soluble polyurethane; after testing, the number...

Embodiment 3

[0037] A kind of comb polyurethane lubricant, it is prepared by following method:

[0038] S1. Weigh 1.5 mol of diisocyanate C (O=C=N-(CH 2 ) 8 -N=C=O) and 1mol rapeseed monoglyceride; then diisocyanate C is added to the reaction flask and the temperature is raised to 90°C, and under stirring, coconut oil fatty acid monoglyceride is added dropwise to the reaction flask In the bottle, continue stirring at constant temperature for 4 hours to obtain unblocked polyurethane;

[0039] S2. Increase the reaction temperature to 120° C., drop an excess of 3.8 mol methanol into the reaction product obtained in step S1, continue to stir at a constant temperature for 5 hours after the dropwise addition, and then naturally cool to room temperature to obtain a methyl-terminated polyurethane crude product ;

[0040] S3. Carrying out rotary evaporation under reduced pressure on the crude polyurethane product obtained in step S2 to remove unreacted methanol to obtain comb-shaped ester-solubl...

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Abstract

The invention discloses a comb-shaped polyurethane lubricant and a water-based drilling fluid. The comb-shaped polyurethane lubricant is composed of an ester-soluble comb-shaped polyurethane and lubricating oil base oil; the ester-soluble comb-shaped polyurethane is composed of a carbon number of C 6 ~C 10 The diisocyanate of the straight-chain alkyl group and the hydrophobic carbon chain on the ester group carbon have a carbon number of C 11 ~C 17 A polyurethane product obtained by polymerizing fatty acid monoglycerides of alkyl groups and completing the capping reaction with methanol. The lubricating oil base oil is any one or any two or both of coconut oil, soybean oil, cottonseed oil, and rapeseed oil. More than one mixture mixed in any proportion; the comb-shaped polyurethane lubricant not only has the advantages of strong extreme pressure lubrication effect of traditional oil-based lubricants, but also has the advantages of long lubrication duration and good cycle stability; in addition It has good compatibility with different water-based drilling fluids, so that the water-based drilling fluid containing the comb-shaped polyurethane lubricant can be widely used in horizontal wells with long open holes and wells with complex structures.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a comb-shaped polyurethane lubricant and water-based drilling fluid. Background technique [0002] At present, water-based drilling fluids still have relatively frequent engineering problems such as back pressure, pipe sticking and insufficient water power transmission in the construction process of long horizontal sections of complex structures. The main reason is the lubrication of lubricants in water-based drilling fluids. Insufficient sex. Therefore, the research and development of continuous adsorption of water-based drilling fluid lubricants on the surface of drilling tools and the improvement of the lubricating film strength of oil-based lubricants are an important part of the application of water-based drilling fluids in long open-hole horizontal wells in the future. [0003] Published patent application CN201711091999 adopts C10-C18 single organic acid and al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/035C09K8/24
CPCC09K8/035C09K8/24C09K2208/34
Inventor 郭剑梅王磊磊卢福伟张坤孙双刘强李广环马红魏尽然苏君
Owner CNPC BOHAI DRILLING ENG
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