Nano blocking agent as well as preparation method and application thereof

A nano plugging agent and nano calcium carbonate technology, applied in the field of oil drilling, can solve problems such as difficulty in achieving plugging effect, and achieve the effects of wide particle size distribution, good oil solubility and good stability

Inactive Publication Date: 2021-03-02
ANTON OILFIELD SERVICES (GRP) LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the micro-cracks and pores in shale formations, most of them belong to the micro-nano scale, and the pores are extremely small. Due to the large particle size of conventional micron-scale plugging agents, the particle size distribution is limited to micron-scale, which is different from the nano-scale in shale formations. It is difficult to achieve the ideal plugging effect if the pore size does not match

Method used

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  • Nano blocking agent as well as preparation method and application thereof
  • Nano blocking agent as well as preparation method and application thereof
  • Nano blocking agent as well as preparation method and application thereof

Examples

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preparation example Construction

[0048] The present invention also provides the preparation method of the above-mentioned nanometer plugging agent, comprising the following steps:

[0049] 1) adding a modifier in white oil, uniformly dispersing, then adding graphene therein, uniformly dispersing, to obtain a graphene mother liquor;

[0050] Using oxygen-containing functional groups such as hydroxyl and carboxyl groups in functionalized graphene nanosheets, and using n-dodecyltriethoxysilane with long-chain alkyl groups as modifiers, the functionalized graphene nanosheets can be chemically bonded In the form of grafting long-chain alkyl to change its suspension stability in white oil, the required graphene mother liquor was obtained through the previous steps;

[0051] 2) adding the stabilizer to the graphene mother liquor obtained in step 1), dispersing evenly, then adding nano-calcium carbonate and nano-silicon dioxide therein successively, using ultrasonic wave or microwave oscillation dispersion or ultra-h...

Embodiment 1

[0056] The present embodiment provides a method for preparing a nano-plugging agent for drilling fluid, which includes:

[0057] 1) Take 600g of light white oil W1-100, add 5g of n-dodecyltriethoxysilane modifier, use ultrasonic vibration dispersion (frequency 50KHz), add 5g graphene after vibration dispersion for 30 minutes, continue to shake Graphene mother liquor was obtained after 20 minutes;

[0058] 2) in the obtained graphene mother liquor, add 40g stabilizer, use ultrasonic vibration dispersion (frequency 50KHz), add 350g nano calcium carbonate, 50g nano silicon dioxide after vibration dispersion 30 minutes, continue to vibrate after 20 minutes to obtain The nano-blocking agent (1050g); the nano-blocking agent, in parts by weight, includes: white oil: 600 parts; graphene: 5 parts; modifier: 5 parts; nano-calcium carbonate: 350 parts; Nano silicon dioxide: 50 parts; stabilizer: 40 parts.

[0059] The drilling fluid nano-plugging agent prepared in Example 1 was subject...

Embodiment 2

[0088] The present embodiment provides a method for preparing a nano-plugging agent for drilling fluid, which includes:

[0089] 1) Take 500g of light white oil W1-90, add 5g of sodium oleate modifier, use ultrasonic vibration dispersion (frequency 50KHz), add 5g graphene after vibration dispersion for 30 minutes, and continue to vibrate for 20 minutes to obtain graphene mother liquor;

[0090] 2) in the obtained graphene mother liquor, add 20g stabilizer, use ultrasonic vibration dispersion (frequency 50KHz), add 300g nano calcium carbonate, 30g nano silicon dioxide after vibration dispersion 30 minutes, continue to vibrate after 20 minutes to obtain The nano-blocking agent (860g); the nano-blocking agent, in parts by weight, includes: white oil: 500 parts; graphene: 5 parts; modifier: 5 parts; nano-calcium carbonate: 300 parts ; Nano silica: 30 parts; Stabilizer: 20 parts.

[0091] The drilling fluid nano-plugging agent prepared in Example 2 is subjected to laser particle ...

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Abstract

The invention provides a nano blocking agent and a preparation method and an application thereof, and the nano blocking agent comprises the following components in parts by weight: 500-600 parts of white oil; 5 parts of graphene; 5 parts of a modifier; 300-350 parts of nano calcium carbonate; 30-50 parts of nano silicon dioxide; and 20-40 parts of a stabilizer. The nano blocking agent provided bythe invention is wide in particle size distribution range, and can meet the blocking requirements of nano hole seams of different shale formations in the drilling process.

Description

technical field [0001] The invention relates to the technical field of oil drilling, in particular to a nanometer plugging agent and a preparation method and application thereof. Background technique [0002] In the drilling construction of shale gas horizontal wells, the instability of the wellbore in shale formation is the primary problem to be solved, and the good plugging performance of the drilling fluid is one of the main factors to ensure the stability of the wellbore. The plugging agent is the key to the good plugging ability of the drilling fluid. For the micro-fractures and pores in shale formations, most of them are micro-nano-scale, and the pores are extremely small. The conventional micro-scale plugging agent has a large particle size and the particle size distribution is limited to the micro-scale, which is different from the nano-scale of shale formation. It is difficult to achieve the ideal plugging effect if the pore size does not match. SUMMARY OF THE IN...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/32C09K8/42C09K8/467E21B33/138
CPCC09K8/467C09K8/426C09K8/03C09K8/035C09K8/32E21B33/138C09K2208/10C09K2208/12C09K2208/34C09K2208/18
Inventor 金鑫邓小刚彭商平谭文军
Owner ANTON OILFIELD SERVICES (GRP) LTD
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