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Bionic and amphiphobic high-efficiency water-based drilling fluid

A drilling fluid and bionic technology, which is used in earth-moving drilling, flushing wellbore, wellbore/well components, etc., can solve the problems of oil and gas layer damage, difficulty in dealing with lost circulation, and no excess, so as to reduce the incidence of lost circulation. , The effect of reservoir protection is good, and the effect of reducing friction complexity

Active Publication Date: 2022-04-15
CHINA UNIV OF PETROLEUM (BEIJING) +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based drilling fluids have inherent defects in "wellbore stability, lubricity, and protection of oil and gas layers"; although oil-based drilling fluids have excellent wellbore stability, lubricity, and protection of oil and gas layers, they are usually difficult to drill high. The first choice for wells, but its application is limited due to defects such as serious environmental pollution, high preparation costs, difficulty in lost circulation treatment, difficulty in carrying cuttings, and poor cementing quality for a long time
Therefore, under the new normal of more and more complex drilling conditions, strict environmental protection requirements and large fluctuations in oil prices, since the 21st century, domestic and foreign hotspots have focused on high-performance water-based drilling fluids with the advantages of "water-based and oil-based drilling fluids". Although some progress has been made in the past 10 years, only certain aspects of performance have been improved to a certain extent compared with the previous ones, and no substantial breakthroughs have been made, such as: wellbore stability, lubricity, and oil and gas layer protection effects have not Reaching or not exceeding the level of oil-based drilling fluid, so that "hole wall collapse, sticking and sticking, lost circulation, unclean borehole, oil and gas layer damage, and environmental pollution" are not only the key and common major technologies in the field of drilling fluids It is a difficult problem, and it is a technical problem in the efficient exploration and development of unconventional and complex oil and gas
[0004]Because relying on the existing drilling fluid theory and technology has been unable to solve the drilling fluid technical problems encountered in drilling, therefore, must be based on independent innovation, and other disciplines newly developed Combining advanced theories and methods, pursuing theory, method and technological innovation, first inventing new materials for drilling fluid series, and then inventing original water-based drilling fluid systems, creating a new drilling fluid theory and technology to solve the current domestic and foreign unconventional and The key and common technical problems of "hole wall collapse, sticking and sticking, lost circulation, unclean borehole, oil and gas layer damage, and environmental pollution" have not been solved for a long time in the complex oil and gas drilling process

Method used

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  • Bionic and amphiphobic high-efficiency water-based drilling fluid
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  • Bionic and amphiphobic high-efficiency water-based drilling fluid

Examples

Experimental program
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preparation example Construction

[0046] Among them, preferably, the preparation method of the polymer suitable for the well wall stabilizer comprises: in the presence of the initiator, in the aqueous solvent, the monomer shown in the formula (1'-a), the formula ( The monomer shown in 2'-a), the monomer shown in formula (3'-a) and the monomer shown in formula (4'-a) carry out polymerization reaction, wherein, the monomer shown in formula (1'-a) The monomers shown, the monomers shown in formula (2'-a), the monomers shown in formula (3'-a) and the monomers shown in formula (4'-a) have a molar ratio of 1: (1.05-3):(0.5-0.95):(0.2-0.9);

[0047] Formula (1'-a) Formula (2'-a)

[0048] Formula (3'-a) Formula (4'-a)

[0049] Among them, R 1 -R 7 , R 10 -R 12 and R 13 -R 15 each independently selected from H and C1-C6 alkyl; R 8 -R 9 and R 16 Alkyl selected from C1-C8; M selected from H or alkali metal elements; L 1 and L 2 each independently selected from C0-C6 alkylene groups.

[0050] The grou...

preparation example 1

[0168] The four monomers were added to the In 100mL of distilled water (making the total molar concentration of the four monomers in the reaction system be 0.004mol / mL), feed nitrogen to remove oxygen, then add the initiator (NH 4 ) 2 S 2 o 8 Accounting for 0.6% by weight of the total mass of the system (accounting for the percentage of the total weight of the four monomers, the same below), at 69°C and under anaerobic conditions, stirring at 300r / min for 3 hours to obtain the polymer GB-1 for well wall stabilizer , and its weight-average molecular weight is 155,000 g / mol.

preparation example 2

[0170] The four monomers were added to 100 mL of distilled water at a molar ratio of DMDAAC:methacrylamide:AA:Vac=6:5:4:3.8 (so that the total molar concentration in the reaction system was 0.004mol / mL). Enter nitrogen to remove oxygen, then add initiator potassium persulfate to account for 0.5% by weight of the total mass of the system, and keep stirring at 300r / min under anaerobic conditions for 5 hours at 65°C to obtain polymer GB-2 for well wall stabilizer. Its weight average molecular weight is 138000 g / mol.

[0171] Bionic lubricant preparation example 1

[0172]Styrene is washed with 20% by weight NaOH aqueous solution at normal temperature, then the styrene after washing is added 250ml deionized water by the mol ratio of styrene:butyl acrylate=7:3 (use amount makes total concentration be 0.2mol / mL ) mixed to generate a shear emulsification reaction, then pass into nitrogen for 30min to replace the air in the reaction vessel, raise the temperature to 50°C and add initi...

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Abstract

The invention relates to the field of oilfield chemistry in the petroleum industry, in particular to bionic and amphiphobic drilling fluid. The drilling fluid contains a bionic wall-fixing agent, a bionic lubricant, a super-amphiphobic agent, a chip-carrying agent and a bionic shale inhibitor. On the basis of a bionics theory and an underground rock surface amphiphobic theory, a bionic wall-fixing agent, a bionic lubricant, a super-amphiphobic agent, a chip-carrying agent and a bionic shale inhibitor which imitate the special properties of animals and plants in nature are adopted, and a series of bionic treatment agents are adopted as a core to form a bionic and amphiphobic drilling fluid system applied to an unconventional complex oil and gas well.

Description

technical field [0001] The invention relates to the field of oilfield chemistry in the petroleum industry, in particular to a bionic and amphiphobic high-efficiency water-based drilling fluid. Background technique [0002] Drilling is the only engineering technology that connects underground oil and gas with the ground. Drilling fluid is an engineering fluid technology that ensures the safe, efficient and smooth implementation of drilling engineering, also known as the "blood" of drilling engineering. However, the newly discovered unconventional and complex oil and gas resources in my country and the world are mainly distributed in mountainous areas, deserts, plateaus, loess plateaus, the Arctic Circle, and ocean-covered areas. The geological and ground conditions encountered by drilling are becoming more and more complex, and exploration and development are becoming more and more difficult. The larger the drilling fluid, the more complex situations or accidents related to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/24C09K8/03E21B21/00
CPCC09K8/24C09K2208/10C09K2208/12C09K2208/34C09K8/16C09K8/206
Inventor 蒋官澄孙金声贺垠博彭春耀杨丽丽董腾飞倪晓骁骆小虎罗绪武梁兴谭宾王勇付大其耿铁冉启发刘小波程荣超罗健生赵利崔凯潇
Owner CHINA UNIV OF PETROLEUM (BEIJING)