Organic/inorganic nano-composite gel plugging agent and oil-based drilling fluid

An oil-based drilling fluid and inorganic nanotechnology, applied in the field of oil-based drilling fluid, can solve problems such as wellbore instability and achieve good performance

Active Publication Date: 2021-09-21
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem of well wall instability caused by the inability of conventional plugging agents to effectively plug pores and fractures in shale, the present invention provides an organic / inorganic nanocomposite gel plugging agent, whose particle size is nanoscale, capable of Effectively plug nano-scale pores and fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall

Method used

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  • Organic/inorganic nano-composite gel plugging agent and oil-based drilling fluid
  • Organic/inorganic nano-composite gel plugging agent and oil-based drilling fluid
  • Organic/inorganic nano-composite gel plugging agent and oil-based drilling fluid

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Embodiment 1

[0028] Preparation of poly(butyl oleate-co-N-isopropylacrylamide-co-stilbene)-zirconia nanocomposite gel: Take an appropriate amount of nano-zirconia powder and dry it at 60°C for 6 hours, then put it in a desiccator spare. Weigh 2.62g of dried nano zirconia sample, pour it into 15ml of toluene, and ultrasonically disperse for 40min to disperse the nano zirconia in the solution. Continue to add 10ml of 10% silane coupling agent KH-570 to it, and sonicate for 10min. Then pour the resulting liquid into a flask and react at 70°C for 30min. Cool to room temperature, centrifuge for 20 minutes, and then ultrasonically disperse for 10 minutes. Suction filtration and washing to obtain modified nano zirconia. The modified product of nano-zirconia was dispersed with 90ml of ethanol / water dispersion, 6g of butyl oleate, 2.4g of N-isopropylacrylamide and 2.4g of stilbene were added, and 0.1g of crosslinking agent divinylbenzene was added. Keep stirring quickly, and pass nitrogen gas a...

Embodiment 2

[0030] Preparation of poly(butyl oleate-co-N-isopropylacrylamide-co-stilbene)-zirconia nanocomposite gel: Take an appropriate amount of nano-zirconia powder and dry it at 70°C for 7 hours, then put it in a desiccator spare. Weigh 3.54g of dried nano zirconia sample, pour it into 20ml of toluene, and ultrasonically disperse for 40min to disperse the nano zirconia in the solution. Continue to add 15ml of 10% silane coupling agent KH-570 to it, and sonicate for 20min. Then pour the resulting liquid into a flask and react at 80°C for 40min. Cool to room temperature, centrifuge for 30 minutes, and then ultrasonically disperse for 20 minutes. Suction filtration and washing to obtain modified nano zirconia. Disperse the modified product of nano-zirconia with 110ml ethanol / water dispersion liquid, add 6.5g butyl oleate, 3.25g N-isopropylacrylamide and 4.87g stilbene, crosslinking agent divinylbenzene 0.44g , maintain rapid stirring, and pass nitrogen gas under the condition of 60°...

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Abstract

The invention discloses an organic/inorganic nano composite gel plugging agent and an oil-based drilling fluid. A plugging agent used for the oil-based drilling fluid is organic/inorganic nano-composite gel, and synthetic raw materials of the organic/inorganic nano-composite gel comprise zirconium oxide powder, butyl oleate, N-isopropylacrylamide and stilbene. A cross-linking agent is divinyl benzene. The drilling fluid comprises the organic/inorganic nano composite gel provided by the invention. The organic/inorganic nano composite gel serves as a nano plugging agent, the particle size of the organic/inorganic nano composite gel is approximately distributed between 40 nm and 150 nm, drilling fluid filtrate can be effectively prevented from invading the stratum, accidents such as borehole wall collapse are prevented, the organic/inorganic nano composite gel is particularly suitable for nano plugging of shale strata, the principle of the preparation method is reliable, and the organic/inorganic nano composite gel has wide market prospects.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to an organic / inorganic nano composite gel plugging agent and an oil-based drilling fluid containing the nano plugging agent. Background technique [0002] At present, in domestic and foreign drilling, there are often problems of well wall instability. The statistics of hundreds of wells at home and abroad show that the shale formations drilled account for 70% of the total formations drilled, and more than 90% of the well collapses occurred in the shale formations. rock formations. Shale has a special pore-fracture-pore structure, which belongs to ultra-low porosity and low permeability type, and most of them are nano-scale pores and fractures. In view of the accumulation characteristics of shale gas, horizontal well drilling has become the main drilling method for shale gas development. For horizontal wells, most of them at home and abroad use oil-based drilling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/467C09K8/34
CPCC09K8/467C09K8/34
Inventor 谢刚谷硕黄进军邓明毅范莉罗玉婧陈宇雷震曹少帅黄国豪汪若兰莫俊秀范翠玲罗清欣
Owner SOUTHWEST PETROLEUM UNIV
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