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Plugging agent for oil-based drilling fluid and application thereof

A technology of oil-based drilling fluid and plugging agent, applied in the directions of reagents, drilling compositions, products, etc., can solve the problems of poor gel strength, lack of viscoelasticity, poor thermal stability, etc.

Active Publication Date: 2021-05-04
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.
[0005] CN1171969C discloses a drilling plugging agent, which is composed of swelling material, bridging material, filling material and inhibitory material, etc. The temporary plugging agent uses strong basic organic salts such as polyacrylonitrile sodium salt as the inhibitory material , the use of such substances is likely to cause pollution of oil and gas wells, and at the same time increases the complexity of the composition of temporary plugging agents
Since the particles used do not have viscoelasticity, they are poorly matched with downhole channels or fractures, making it difficult to achieve effective plugging
In addition, when these inorganic substances are added to drilling fluid, they have poor compatibility with drilling fluid
[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 and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Heat 52g of tall oil fatty acid in the reactor to 80°C, add 21.3g of ethylenediamine, and introduce N 2 Protected, reacted at 125°C for 4.0h, then added 17.8g of polyethylene glycol 400, stirred for 20min, and dehydrated to obtain a compatibilization modifier; heated 200g of deasphalt with a softening point of 82.6°C to a molten state, and added 29.5g The above compatibilizer was stirred at 155°C for 20 minutes, then 11.5g of LP-3 liquid polysulfide rubber was added and stirred for 30 minutes to obtain modified asphalt.

[0045] Cool the obtained modified asphalt to 120°C, add 17.5g of coco-based 1,3-propylenediamine, stir for 10 minutes, then add 27.2g of CYD-128 type epoxy resin, stir evenly, and keep the temperature at 125°C at 6.0 After the product was cooled to room temperature, it was placed in a freezer at -35°C for 6 hours, and crushed with a pulverizer. Then sieve with 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves to obtain highly elastic modified as...

Embodiment 2

[0048] Heat 40g of tall oil fatty acid in the reactor to 95°C, add 13.8g of ethylenediamine, and introduce N 2 Protected, reacted at 120°C for 3 hours, then added 10.6g of ethylene glycol, stirred for 15min, and dehydrated to obtain a compatibilization modifier; heated 200g of oxidized asphalt with a softening point of 87.8°C to a molten state, and added 17.8g of the above-mentioned compatibilizer agent, stirred at 165°C for 15 minutes, then added 18.2g of liquid nitrile rubber, and stirred for 25 minutes to obtain modified asphalt.

[0049] Cool the obtained modified asphalt to 125°C, add 25.4g of hydrogenated tallow propylene diamine, stir for 15 minutes, then add 35.2g of E-44 type epoxy resin, stir evenly, and react at a constant temperature of 135°C for 5 hours; After the obtained product was cooled to room temperature, it was placed in a freezer at -45°C for 5 hours, and crushed with a pulverizer. Then sieve with 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves t...

Embodiment 3

[0052] Heat 48g of tall oil fatty acid in the reactor to 100°C, add 23.4g of ethylenediamine, and introduce N 2 Protected, reacted at 130°C for 3.0h, then added 17.8g of polyethylene glycol 400, stirred for 25min, and dehydrated to obtain a compatibilization modifier; heated 200g of oxidized asphalt with a softening point of 93.5°C to a molten state, and added 30.4g The above compatibilizer was stirred at 175°C for 15 minutes, then 15.4 g of liquid nitrile rubber was added and stirred for 25 minutes to obtain modified asphalt.

[0053] Cool the obtained modified asphalt to 135°C, add 21.6g of octadecyl dimethyl tertiary amine, stir for 10 minutes, then add 31.8g of CYD-128 type epoxy resin, stir evenly, and keep the temperature at 130°C for 8.0 hours. Reaction: After the obtained product was cooled to room temperature, it was placed in a freezer at -25°C for 7 hours, and crushed with a pulverizer. Then sieve with 40-mesh, 80-mesh, 120-mesh and 160-mesh standard sieves to obta...

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Abstract

The invention discloses a plugging agent for oil-based drilling fluid and an application thereof. The plugging agent comprises the following components in parts by weight: 50-80 parts of high-elastic modified asphalt particles, 5-20 parts of a fiber material, 1-10 parts of superfine calcium carbonate and 5-20 parts of a graphite material, wherein the modified asphalt in the high-elastic modified asphalt particles is obtained by modifying matrix asphalt through a compatibilization modifier and a flexibilizer, and the compatibilization modifier is a product obtained by reacting fatty acid, polyamine and polyol. The plugging agent disclosed by the invention is good in compatibility with oil-based drilling fluid, high in plugging speed, strong in high-temperature resistance and relatively 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 and its application. Background technique [0002] With the exploration and development of unconventional oil and gas resources such as shale gas, the application of oil-based drilling fluids is becoming more and more extensive. 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 loss 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 complex situations such as stuck pipe, blowout, and instability of the wellbore, and even leads to the scrapping of the wellbore. Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/32C08L95/00C08L81/04C08L9/02C08L63/00C08L71/02C08K5/20
CPCC09K8/32C08L95/00C09K2208/08C09K2208/12C08L81/04C08L9/02C08L63/00C08L71/02C08K5/20Y02P20/141
Inventor 傅丽郭皎河刘成郭小圣吴晓颖
Owner CHINA PETROLEUM & CHEM CORP
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