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Soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and oil-based drilling fluid

A technology of oil-based drilling fluid and nano-plugging agent, applied in the field of oil-based drilling fluid, can solve problems such as wellbore instability, and achieve the effects of enhancing salt resistance, good compatibility, and strong temperature resistance.

Active Publication Date: 2021-09-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of wellbore instability caused by conventional plugging agents that cannot effectively plug nanopores and fractures in shale, the present invention provides an oil-based drilling fluid nano plugging agent with a particle size of Reaching the nanometer level, it can effectively seal the nanoscale pores and fractures in the shale formation, so as to achieve the purpose of stabilizing the well wall

Method used

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  • Soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and oil-based drilling fluid
  • Soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and oil-based drilling fluid
  • Soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and oil-based drilling fluid

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Embodiment 1

[0023] Modification of rigid materials: First, 5g of graphene oxide was added to 150mL of deionized water in a 250mL round-bottomed three-neck flask, and the mixture was dispersed by ultrasonic dispersion for 30min, then, 15ml of 3-(methacryloyloxy)propyl trimethyl Oxysilane and 5 drops of NH 3 ·H 2 O into the dispersion, the mixture was stirred at room temperature at a stirring speed of 400 rpm for 30 min, then the flask was immersed in a water bath at 60 °C, and stirred at the same stirring speed for 2 h, finally, the mixture was centrifuged and washed with ethanol and deionized water to remove Impurities were removed, and vacuum-dried at 60° C. for 24 hours, and then ground and dispersed to obtain a solid sample of the modified nano rigid material.

[0024] Synthesis of oil-based drilling fluid nano-sealing agent that is soft on the outside and rigid on the inside: First, introduce 125ml of deionized water into a 250ml round-bottomed three-neck bottle, add 2.5g of modified...

Embodiment 2

[0026] Modification of rigid materials: First, 5g of graphene oxide was added to 150mL of deionized water in a 250mL round-bottomed three-neck flask, and the mixture was dispersed by ultrasonic dispersion for 30min, then, 15ml of 3-(methacryloyloxy)propyl trimethyl Oxysilane and 5 drops of NH 3 ·H 2 O into the dispersion, the mixture was stirred at room temperature at a stirring speed of 400 rpm for 30 min, then the flask was immersed in a water bath at 60 °C, and stirred at the same stirring speed for 2 h, finally, the mixture was centrifuged and washed with ethanol and deionized water to remove Impurities were removed, and vacuum-dried at 60° C. for 24 hours, and then ground and dispersed to obtain a solid sample of modified nano-graphene oxide.

[0027] Synthesis of oil-based drilling fluid nano-sealing agent that is soft on the outside and rigid on the inside: First, introduce 125ml of deionized water into a 250ml round-bottomed three-neck bottle, add 2.5g of modified gra...

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Abstract

The invention discloses a soft-outside and rigid-inside oil-based drilling fluid nano blocking agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The soft-outside and rigid-inside oil-based drilling fluid nano blocking agent is mainly prepared from graphene oxide, a benzene ring-containing monomer, olefin containing carbon-carbon double bonds and sodium methallyl sulfonate as main materials by adopting a continuous emulsion polymerization method; the soft-outside and rigid-inside oil-based drilling fluid nano blocking agent has a plurality of benzene rings and sulfonic acid functional groups, and has good temperature resistance and salt resistance. The synthetic raw materials of the blocking agent are easy to obtain, and the synthetic method is simple and reliable. The particle size of the synthesized soft-outside and rigid-inside oil-based drilling fluid nano blocking agent is 120-330 nm, and nano-sized apertures in a mud shale well wall can be effectively blocked by the synthesized soft-outside and rigid-inside oil-based drilling fluid nano blocking agent. The nano blocking agent can be directly added into the oil-based drilling fluid, is good in compatibility, can effectively prevent the drilling fluid from permeating into a stratum, further stabilizes a well wall and prevents collapse, and has good blocking and filtrate reduction effects.

Description

Technical field [0001] The invention relates to the technical field of oil and gas field drilling, and in particular to an externally soft and internally rigid oil-based drilling fluid nano-blocking agent and an oil-based drilling fluid containing the blocking agent. Background technique [0002] In the process of developing oil and natural gas resources, the exploitation of deep shale gas has always been a research hotspot for researchers. For some hard, brittle and fractured formations with bedding and nanopore fractures, the invasion of oil-based drilling fluid filtrate will bring instability to the formation. In addition, the transmission of hydraulic pressure through nanopore fractures will also cause well wall instability. Therefore, the sealing ability of oil-based drilling fluids on nanopore fractures must be enhanced. At present, there are few types of plugging agents for oil-based drilling fluids. Most of the plugging materials used are bridge plug-type leak-proof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/035C09K8/42C09K8/512C09K8/32
CPCC09K8/03C09K8/032C09K8/035C09K8/426C09K8/512C09K8/32C09K2208/10
Inventor 谢刚雷震邓明毅罗玉婧范莉陈宇曹少帅黄国豪谷硕汪若兰
Owner SOUTHWEST PETROLEUM UNIV
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