Deformable oil-based drilling fluid leakage blocking agent and preparation method thereof

A technology for oil-based drilling fluid and loss-stopping agent, which is applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the loss of oil-based drilling fluid, the lack of compatibility of oil-based drilling fluid treatment agent, and the lack of oil resistance. and other problems, to achieve the effect of excellent pressure bearing capacity

Active Publication Date: 2016-04-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the configuration cost of oil-based drilling fluid is much higher than that of water-based drilling fluid. If drilling in complex fractured formations, a large amount of oil-based drilling fluid will be lost, which will not only affect the drilling efficiency, but also cause immeasurable economic losses.
[0003] At present, the most widely used lost circulation agents in China are basically developed for water-based drilling fluid systems. Water-based lost circulation agents used in oil-based drilling fluid systems have poor dispersibility, weakened oil strength, and shear It is easy to break, does not have oil resistance, and has the problem of insufficient compatibility with other oil-based drilling fluid treatment agents, which affects the plugging effect in field applications to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Modified SiO 2 Nanosphere preparation:

[0026] Into the reactor, add 120g of deionized water, 360g of absolute ethanol, and 20g of concentrated ammonia water in mass percent, stir evenly, heat up to 25°C, then slowly add 150g of methyl orthosilicate dropwise, and control the stirring speed at 480-500 rpm / min, after 2 hours of reaction, add 10g of 3-(trimethoxysilyl)propyl-2-methyl-2-acrylate and react for 8 hours, centrifuge, wash with absolute ethanol three times, and dry in vacuum at 45°C for 24 hours spare.

[0027] Preparation of deformable oil-based plugging agent:

[0028] In the reactor, add 60g of water, 180g of absolute ethanol, 8g of sodium dodecylbenzenesulfonate, 0.8g of OP-10, 100g of the modified SiO obtained in the previous step reaction 2 Nanospheres are used as seeds, stirred evenly, heated to 65°C under the protection of nitrogen, added 2g of azobisisobutyronitrile, added dropwise with 120g of methyl acrylate to react for 6 hours, centrifuged, was...

Embodiment 2

[0030] Modified SiO 2 Nanosphere preparation:

[0031] Into the reactor, add 130g of deionized water, 390g of absolute ethanol, and 40g of concentrated ammonia water in mass percent, stir evenly, heat up to 25°C, then slowly add 160g of tetraethyl orthosilicate dropwise, and control the stirring speed at 480-500 rpm / min, after 2 hours of reaction, add 8g of γ-aminopropyltrimethoxysilane to react for 8 hours, then centrifuge, wash with absolute ethanol ultrasonically for three times, and dry in vacuum at 45°C for 24 hours for later use.

[0032] Preparation of deformable oil-based plugging agent:

[0033] In the reactor, add 60g of water, 180g of absolute ethanol, 10g of cetyltrimethylammonium bromide, 0.8g of Tween-80, 100g of the modified SiO obtained in the previous step reaction 2 Nanospheres are used as seeds, stirred evenly, heated to 65°C under nitrogen protection, added 1.5g of azobisisobutyronitrile, added dropwise with 150g of ethyl acrylate to react for 6 hours, c...

Embodiment 3

[0035] Modified SiO 2 Nanosphere preparation:

[0036] Into the reactor, add 100g of deionized water, 300g of absolute ethanol, 60g of concentrated ammonia water in mass percent, stir evenly, heat up to 25°C, then slowly add 150g of propyl orthosilicate dropwise, and control the stirring speed at 480-500 rpm After 2 hours of reaction, add 8 g of γ-mercaptopropyltriethoxysilane to react for 8 hours, centrifuge, wash with absolute ethanol ultrasonically for three times, and dry in vacuum at 45°C for 24 hours for later use.

[0037] Preparation of deformable oil-based plugging agent:

[0038] In the reactor, add 50g of water, 100g of absolute ethanol, 10g of sodium fatty acid, 0.8g of AEO-9, 100g of the modified SiO obtained in the previous step reaction 2 Nanospheres are used as seeds, stirred evenly, heated to 65°C under nitrogen protection, added 1.5g of azobisisobutyronitrile, added dropwise with 250g of butyl acrylate to react for 6 hours, centrifuged, washed with absolute...

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Abstract

The present invention relates to a deformable oil-based drilling fluid leakage blocking agent and a preparation method thereof. The preparation method comprises: adopting orthosilicate as a silicon source, adopting concentrated ammonia water as a catalyst and adopting a silane coupling agent as a surface modifier prepare SiO2 nano-spheres, adopting the SiO2 nano-spheres as core, adding a main emulsifier, an auxiliary emulsifier, an initiator and an oil-absorbing monomer, and using emulsion polymerization to obtain the deformable oil-based drilling fluid leakage blocking agent, wherein the average particle size is 50-870 nm. According to the present invention, the rigid SiO2 nano-spheres are adopted as the core, the good pressure bearing capacity is provided, the expansion volume multiple can be up to 1.8 times after the deformable oil-based drilling fluid leakage blocking agent is in the oil for 1 h, the deformable oil-based drilling fluid leakage blocking agent can be suitable for different sizes and shapes of gaps or cracks, and the sand bed experiment evaluation results show that the leakage blocking agent has a good blocking effect.

Description

technical field [0001] The invention relates to a drilling fluid treatment agent and a preparation method thereof, in particular to a plugging agent for oil-based drilling fluid and a preparation method thereof. Background technique [0002] Oil-based drilling fluid has obvious advantages in stabilizing the well wall, lubricating and preventing sticking, inhibiting shale hydration expansion, forming slurry in the formation, and rapid drilling. , an important means of protecting various complex well sections and reservoirs. However, the configuration cost of oil-based drilling fluid is much higher than that of water-based drilling fluid. If complex fractured formations are drilled, a large amount of oil-based drilling fluid will be lost, which not only affects the drilling efficiency, but also causes immeasurable economic losses. [0003] At present, the most widely used lost circulation agents in China are basically developed for water-based drilling fluid systems. Water-ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/42
Inventor 封心领袁俊秀王康逯贵广庞雨微
Owner CHINA PETROLEUM & CHEM CORP
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