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Flexible-outside rigid-inside multi-walled carbon nanotube nano plugging agent and oil-based drilling fluid

A technology of multi-walled carbon nanotube and nanometer plugging agent, which is applied in the field of oil and gas field drilling, can solve problems such as wellbore instability, and achieve the effects of high temperature resistance and plugging performance, stable performance and easy production.

Pending Publication Date: 2022-03-22
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 well wall instability caused by conventional plugging agents unable to effectively plug nano-cracks in mud shale, the present invention provides a multi-walled carbon nanotube nano-sealing agent with a particle size of Nano-scale, can effectively seal nano-scale fractures in shale formations, so as to achieve the purpose of stabilizing the borehole wall

Method used

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  • Flexible-outside rigid-inside multi-walled carbon nanotube nano plugging agent and oil-based drilling fluid
  • Flexible-outside rigid-inside multi-walled carbon nanotube nano plugging agent and oil-based drilling fluid
  • Flexible-outside rigid-inside multi-walled carbon nanotube nano plugging agent and oil-based drilling fluid

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Embodiment 1

[0025] (1) Synthesis of Multi-walled Carbon Nanotubes Grafted Amino Compounds

[0026] Add 0.5-0.6mol of hydroxylated titanium dioxide into 120mL of toluene solution, raise the temperature to 80-90°C and add 0.1-0.2mol of amino-containing silane coupling agent while stirring, to make hydroxylated titanium dioxide and amino-containing silane coupling agent react 5h, distilled under reduced pressure for 2h to obtain the crude product, washed with toluene, filtered to remove unreacted monomer, and dried in vacuum for 2h to obtain modified nano-titanium dioxide, disperse the modified nano-titanium dioxide with 100-110mL of toluene, add 0.25mol containing 1 , 3-diallyl urea, reacted at 65°C for 36h, distilled under reduced pressure for 2h, washed with toluene, filtered, removed unreacted monomer, dried in vacuum for 2h, took 0.25mol of the dried product and added it to 100mL In toluene, stir until dispersed, keep flowing nitrogen for 30min, slowly add 0.25mol 1,2-divinylbenzene, he...

Embodiment 2

[0030] (1) Synthesis of Multi-walled Carbon Nanotubes Grafted Amino Compounds

[0031] Add 0.5-0.6mol of hydroxylated titanium dioxide into 120mL of toluene solution, raise the temperature to 80-90°C and add 0.1-0.2mol of amino-containing silane coupling agent while stirring, to make hydroxylated titanium dioxide and amino-containing silane coupling agent react 5h, distilled under reduced pressure for 2h to obtain the crude product, washed with toluene, filtered to remove unreacted monomer, and dried in vacuum for 2h to obtain modified nano-titanium dioxide, disperse the modified nano-titanium dioxide with 100-110mL of toluene, add 0.25mol containing 1 , 3-diallyl-2-thiourea, reacted at 65°C for 36 hours, distilled under reduced pressure for 2 hours, washed with toluene, filtered, removed unreacted monomers, dried in vacuum for 2 hours, and took 0.25mol of dried Add the product into 100mL toluene, stir until dispersed, keep flowing nitrogen for 30min, slowly add 0.25mol 1,3-di...

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Abstract

The invention discloses a flexible-outside rigid-inside multi-walled carbon nanotube nano plugging agent and an oil-based drilling fluid, and belongs to the technical field of oil and gas field drilling. The external-flexible internal-rigid multi-walled carbon nanotube nano plugging agent is prepared from hydroxylated multi-walled carbon nanotubes (5-15 nm), an amino-containing silane coupling agent, a diallyl urea compound, a vinyl benzene compound containing a diene bond, a long-chain acrylate compound and a triallyl crosslinking agent. The particle size of the external-soft and internal-rigid multi-walled carbon nanotube nano plugging agent provided by the invention is 220-397 nm, the plugging performance is remarkably improved compared with that of similar plugging agents, besides the plugging performance, the plugging agent also resists high temperature, has small influence on performance parameters of oil-based drilling fluid, and can be applied to shale formations of deep wells and ultra-deep wells. The plugging agent also has the advantages of easily available raw materials, low price and the like, and the provided synthesis method is stable, reliable, simple, rapid and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of oil and gas field drilling, in particular to a multi-walled carbon nanotube nano-sealing agent which is flexible on the outside and rigid on the inside and an oil-based drilling fluid. Background technique [0002] Shale gas is a kind of unconventional oil and gas resource with huge potential, and the estimated global shale gas resources are about 456×10 12 m 3 At present, in domestic and foreign drilling, there are often problems of well wall instability. The statistics of 100 wells show that the shale formations drilled account for 70% of the total formations drilled, and more than 90% of the well collapses occurred in shale formations. Shale has a special pore structure, which is ultra-low porosity and low permeability, and mostly nano-scale pore throats. According to the accumulation characteristics of shale gas, horizontal well drilling has become the main drilling method for shale gas development....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/03C09K8/32
CPCC09K8/03C09K8/32C09K2208/10
Inventor 谢刚陈宇邓明毅白杨罗玉婧范莉雷震王平全
Owner SOUTHWEST PETROLEUM UNIV
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