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Plugging agent for oil-based drilling fluid as well as preparation method and application of plugging agent

A technology of oil-based drilling fluid and plugging agent, which is applied in the direction of drilling compositions, chemical instruments and methods, building components, etc., and can solve the problems of increased oil-based drilling fluid viscosity, poor plugging effect while drilling, and Use effect and other issues to achieve the effect of improving high temperature stability, increasing softening point, and improving use effect

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 water-swellable material used as plugging material has shown technical advantages, there are still some shortcomings in the current use of this kind of product in drilling plugging operations: poor gel strength, large expansion multiple and fast expansion rate after absorbing water, thermal poor stability etc.
The composite anti-leakage agent has good adaptability to different permeability loss formations, but the rigid material ultrafine calcium carbonate in the composite anti-leakage agent is a hydrophilic material, which is easy to agglomerate in oil-based drilling fluid, and the dispersion effect is poor, causing Affect the use effect
[0007] 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, Problems such as poor plugging effect while drilling

Method used

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  • Plugging agent for oil-based drilling fluid as well as preparation method and application of plugging agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Put 50g of orthophosphoric acid in the flask, add 25g of phosphorus pentoxide uniformly and slowly in 3 times, and react the above solution under the condition of heating while stirring. The stirring speed was 250 rpm, the temperature was 100° C., and the reaction time was 30 minutes to obtain a modifier.

[0040] Heat 200g of straight-run asphalt to a molten state, add 17.5g of the modifier prepared above, stir and mix at 140°C for 35min to obtain modified matrix asphalt. Heat 15.2g of the extracted oil to 130°C, add 8.6g of SBS to fully swell and melt it, then add it to the above-mentioned modified base asphalt, and use a high-speed shear emulsifier for shearing, the shearing temperature is 185°C, and the shearing time is 35min. Then place it in an oven at 170° C. for 2 hours to obtain modified asphalt.

[0041] Add 36.5g of silicon micropowder (250 mesh) to the obtained modified asphalt and cut it for 30 minutes, cool it to room temperature and put it in a -30°C free...

Embodiment 2

[0044] Put 60g of orthophosphoric acid in the flask, add 20g of phosphorus pentoxide uniformly and slowly in 3 times, and react the above solution under the condition of heating while stirring. The stirring speed was 350 rpm, the temperature was 115° C., and the reaction time was 40 minutes to obtain a modifier.

[0045] Heat 200g of straight-run asphalt to a molten state, add 12.6g of the modifier prepared above, stir and mix at 145°C for 45min to obtain modified matrix asphalt. Heat 11.5g of naphthenic oil to 140°C, add 7.5g of SBS to fully swell and melt, add it to the above-mentioned modified base asphalt, and use a high-speed shear emulsifier for shearing, with a shearing temperature of 180°C and a shearing time of 30 minutes. Then place it in an oven at 175°C for 3.5 hours to develop modified asphalt.

[0046] Add 28.4g of silicon micropowder (325 mesh) to the obtained modified asphalt and cut it for 30 minutes, cool it to room temperature and put it in a -40°C freezer ...

Embodiment 3

[0049] Put 45g of orthophosphoric acid in the flask, add 16.8g of phosphorus pentoxide uniformly and slowly in 3 times, and react the above solution under the condition of heating while stirring. The stirring speed was 300 rpm, the temperature was 120° C., and the reaction time was 45 minutes to obtain a modifier.

[0050] Heat 200g of straight-run asphalt to a molten state, add 8.5g of the modifier prepared above, stir and mix at 150°C for 40min to obtain modified matrix asphalt. Heat 17.2g of the extracted oil to 145°C, add 9.8g of SBS to fully swell and melt it, then add it to the above-mentioned modified base asphalt, and use a high-speed shear emulsifier for shearing, the shearing temperature is 190°C, and the shearing time is 45min. Then place it in an oven at 165° C. for 2.5 hours to obtain modified asphalt.

[0051] Add 43.6g of silicon micropowder (225 mesh) to the obtained modified asphalt and cut it for 40 minutes, cool it to room temperature and put it in a -35°C ...

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Abstract

The invention discloses a plugging agent for oil-based drilling fluid. The plugging agent for the oil-based drilling fluid comprises the following components: 4-20 parts of a fiber material; 10-25 parts of a graphite material; 55-86 parts of high-elastic modified asphalt particles; wherein the high-elastic modified asphalt particle has a core-shell structure, and takes silica powder as a core and modified asphalt as a shell; the modified asphalt is composed of modified matrix asphalt, a modifier and a compatibilizer. The plugging agent for the oil-based drilling fluid is good in compatibility with the oil-based drilling fluid, high in plugging speed, high in high-temperature resistance and wide in 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 oil-based drilling fluid. Background technique [0002] In recent years, the exploration and development of shale gas has developed very rapidly, and oil-based drilling fluids have become more and more widely used. Oil-based drilling fluids are mainly used in various complex well sections such as high-temperature deep wells, offshore drilling, highly deviated directional wells, and horizontal wells. However, the problem of oil-based drilling fluid lost circulation is becoming more and more serious, and the occurrence of lost circulation will bring a lot of inconvenience to drilling engineering. Such as consuming drilling time, loss of drilling fluid and plugging materials. It causes a series of problems such as stuck pipe, blowout, and instability of the wellbore, and even leads to the scrapping of the wellbore. Moreover, it will also cause damage to o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/46C09K8/32C08L95/00C08L53/02C08K3/36C08K3/32
CPCC09K8/46C09K8/426C09K8/32C08L95/00C08K2003/329C08L53/02C08K3/36C08K3/32Y02W30/91
Inventor 傅丽宁爱民徐青柏吴晓颖
Owner CHINA PETROLEUM & CHEM CORP
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