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Plugging agent for drilling fluid and preparation method thereof

A plugging agent and drilling fluid technology, applied in the field of drilling fluid plugging agent and its preparation, can solve the problem of immature development and application of oil-based drilling fluid anti-leakage plugging technology, fast expansion rate and difficult to control, oil Improve the stability of the wellbore wall, improve the plugging effect, and improve the high temperature stability

Active Publication Date: 2022-05-13
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of water-swelling as plugging materials has shown technical advantages, there are still some shortcomings in the use of this type of product in drilling plugging operations: poor gel strength, large expansion multiple after water absorption, fast expansion rate and difficult to control , poor thermal stability, etc.
The method is complex and costly, and in the preparation process, a strong gel is formed. Although the strength is high, the application is difficult, the adaptability is poor, and the use effect is not ideal.
[0006] It can be seen that there are few plugging materials currently used for oil-based drilling fluids, and most of them are plugging agents suitable for water-based drilling fluids. When used in oil-based drilling fluids, the viscosity of oil-based drilling fluids will increase, The plugging effect is not good while drilling, etc. As a supporting technology for oil-based drilling fluid, the development and application of oil-based drilling fluid leakage prevention and plugging technology is not mature enough

Method used

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  • Plugging agent for drilling fluid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Heat 200g of blended asphalt with a softening point of 62.5°C to a molten state, add 18.2g of maleic anhydride, feed nitrogen to keep the pressure of the asphalt reactor at 0.8MPa, and react at 180°C for 6 hours to obtain grafted activated asphalt. Add 21.5 g of pozzolan with an average particle size of 250 nm (sulfur content: 6.4 wt%) to the grafted activated asphalt, and mix and react at 160°C for 50 minutes to obtain the modified asphalt.

[0036] Add 32.5g of 80-mesh nitrile rubber powder to the modified asphalt, and shear at 180°C for 35min. Freeze at -30°C for 5 hours. Then crush it with a pulverizer. Use 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves to sieve to obtain highly elastic modified asphalt particles with different particle sizes of 40-80 mesh, 80-120 mesh, 120-160 mesh, and >160 mesh.

[0037] Take 90g of the above-mentioned highly elastic modified asphalt particles (including 30wt% of 40-80 mesh particles, 35wt% of 120-160 mesh particles, 3...

Embodiment 2

[0039] Heat 200g of oxidized asphalt with a softening point of 71.5°C to a molten state, add 12.5g of polyglutaric anhydride, feed nitrogen to keep the pressure of the asphalt reactor at 0.6MPa, and react at 190°C for 5 hours to obtain grafted activated asphalt. Add 16.2 g of pozzolan with an average particle size of 400 nm (sulfur content is 7.6 wt%) to the grafted activated asphalt, and mix and react at 165°C for 60 minutes to obtain the modified asphalt.

[0040] Add 42.5g of 100-mesh neoprene rubber powder to the modified asphalt, and shear at 175°C for 50min. Freeze at -35°C for 5 hours. Then crush it with a pulverizer. Use 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves to sieve to obtain highly elastic modified asphalt particles with different particle sizes of 40-80 mesh, 80-120 mesh, 120-160 mesh, and >160 mesh.

[0041] Take 68g of the above-mentioned highly elastic modified asphalt particles (including 35wt% of 40-80 mesh particles, 50wt% of 80-120 mesh pa...

Embodiment 3

[0043] Heat 200g of oxidized asphalt with a softening point of 78.4°C to a molten state, add 31.2g of polyoxalic anhydride, feed nitrogen to keep the pressure of the asphalt reactor at 0.6MPa, and react at 195°C for 4.5 hours to obtain grafted activated asphalt. Add 24.6 g of pozzolan with an average particle size of 650 nm (with a sulfur content of 11.5 wt%) to the grafted activated asphalt, and mix and react at 170°C for 70 minutes to obtain the modified asphalt.

[0044] Add 51.5g of 120 mesh styrene-butadiene rubber powder to the modified asphalt, and shear at 170°C for 60min. Freeze at -45°C for 5.5 hours. Then crush it with a pulverizer. Use 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves to sieve to obtain highly elastic modified asphalt particles with different particle sizes of 40-80 mesh, 80-120 mesh, 120-160 mesh, and >160 mesh.

[0045] Take 85g of the above-mentioned highly elastic modified asphalt particles (including 25wt% of 80-120 mesh particles, 50w...

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Abstract

The invention discloses a plugging agent for drilling fluid and a preparation method thereof. The plugging agent for the drilling fluid comprises the following components: 58-90 parts of high-elastic modified asphalt particles; 5-21 parts of a fiber material; 5-21 parts of a graphite material; wherein the high-elastic modified asphalt particle has a core-shell structure, and takes rubber powder as a core and modified asphalt as a shell. The plugging agent provided by the invention is suitable for oil-based drilling fluid, has good compatibility with the oil-based drilling fluid, and has the advantages of fast plugging speed, strong high temperature resistance, and wide adaptability to different sizes of leakage layer pores or cracks.

Description

technical field [0001] The invention relates to the field of oil drilling plugging, in particular to a plugging agent for drilling fluid and a preparation method thereof. Background technique [0002] With the in-depth exploration and development of complex formations, China's unconventional oil and gas resources demand more and more oil-based drilling fluids. Currently, the most widely used and relatively low-cost lost circulation agent is the bridging type. Bridging plugging mainly uses various plugging materials to prepare plugging slurry in a certain proportion, and then plugs the cracks and pore channels, and plugs the leaky layer through bridging, supporting, connecting, plugging, filling, etc. The key technology is plugging Whether the particle size distribution in the leak agent matches the leak path diameter. However, during the drilling process, sometimes the fracture width and pore size of the lost formation cannot be accurately grasped, and the formulation of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C08F289/00C08F222/06C08G81/00
CPCC09K8/03C08F289/00C08G81/00C09K2208/08C08F222/06Y02W30/91
Inventor 傅丽李志军刘成吴晓颖
Owner CHINA PETROLEUM & CHEM CORP
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