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Elastic-plastic plugging particle for oil-based drilling fluid and preparation method of elastic-plastic plugging particle

An oil-based drilling fluid, elastic-plastic technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of complex downhole accidents, plugging, and re-circulation, and achieve good elastic deformation ability and plugging performance. , The effect of good oil resistance and high pressure bearing capacity

Pending Publication Date: 2022-08-02
CHINA PETROLEUM & CHEM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current shale oil and gas development process, oil-based drilling fluid is usually used. Due to the special geological structure and lithological development characteristics of shale formations, lost circulation often occurs, but there is currently no special oil-based drilling fluid for oil-based drilling fluid plugging Plugging materials, still use conventional water-based drilling fluid plugging materials, and some elastic plugging materials for water-based drilling fluids are oil-soluble, will dissolve in oil-based drilling fluids, do not have pressure-bearing plugging performance, and cannot be applied Oil-based drilling fluid plugging
Even oil-resistant rubber, soaked in oil-based drilling fluid for a long time, will partially dissolve, causing the rubber strength, elasticity and other properties to decline, resulting in the inability to form effective plugging or causing re-leakage during drilling
Moreover, water-based drilling fluid plugging materials are mostly hydrophilic materials, which are poorly compatible with oil-based drilling fluids, and are easily contaminated by drilling fluids, affecting the plugging effect or adversely affecting the performance of drilling fluids, resulting in complex downhole accidents

Method used

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  • Elastic-plastic plugging particle for oil-based drilling fluid and preparation method of elastic-plastic plugging particle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An elasto-plastic plugging particle for oil-based drilling fluid, the inner core is an elastic-plastic rubber particle, and the outer shell is coated with inert nano-particles. Wherein, the rubber particles are natural rubber, and the particle size range is 1-3 mm; the inert nanoparticles are nano-calcium carbonate, and the particle size range of the nano particles is 50-100 nm.

[0027] The preparation method of the elastic-plastic plugging particles for the oil-based drilling fluid comprises:

[0028] (1) Select uniform rubber particles with a particle size range of 1-3mm to clean and dry;

[0029] (2) Spray the rubber particles with 8% acetic acid solution and 5% glycerol solution successively, and keep turning the rubber particles during the spraying process to ensure that the surfaces of all rubber particles are fully wetted;

[0030] (3) Put the wetted rubber particles on the temperature-controlled ultrasonic vibrating screen, and the mesh of the screen cloth is ...

Embodiment 2

[0035] An elasto-plastic plugging particle for oil-based drilling fluid, the inner core is an elastic-plastic rubber particle, and the outer shell is coated with inert nano-particles. Wherein, the rubber particles are natural rubber, with a particle size range of 3-5mm; the inert nanoparticles are nano-calcium carbonate, and the nanoparticle size range is 100-200nm.

[0036] The preparation method of the elastic-plastic plugging particles for the oil-based drilling fluid comprises:

[0037] (1) Select uniform rubber particles with a particle size range of 3-5mm to clean and dry;

[0038] (2) Spray the rubber particles with 8% acetic acid solution and 5% glycerol solution successively, and keep turning the rubber particles during the spraying process to ensure that the surfaces of all rubber particles are fully wetted;

[0039] (3) Put the wetted rubber particles on the temperature-controlled ultrasonic vibrating screen, and the mesh of the screen cloth is smaller than the dia...

Embodiment 3

[0044] An elastic-plastic plugging particle for oil-based drilling fluid, the inner core is an elastic-plastic rubber particle, and the outer shell is coated with inert nano particles. Wherein, the rubber particles are natural rubber, with a particle size range of 1-3 mm; the inert nanoparticles are nano-calcium carbonate, and the nanoparticle size range is 50-100 nm.

[0045] The preparation method of the elastic-plastic plugging particles for the oil-based drilling fluid comprises:

[0046] (1) Select uniform rubber particles with a particle size range of 1-3mm to clean and dry;

[0047] (2) Spray the rubber particles with 8% acetic acid solution and 5% glycerol solution successively, and keep turning the rubber particles during the spraying process to ensure that the surfaces of all rubber particles are fully wetted;

[0048] (3) Put the wetted rubber particles on the temperature-controlled ultrasonic vibrating screen, and the mesh of the screen cloth is smaller than the d...

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Abstract

The invention discloses an elastic-plastic plugging particle for oil-based drilling fluid. The inner core of the elastic-plastic plugging particle is an elastic-plastic rubber particle, and the shell of the elastic-plastic plugging particle is coated with inert nanoparticles. Meanwhile, the invention further provides a preparation method of the elastic-plastic plugging particles for the oil-based drilling fluid. The preparation method comprises the steps of selecting the rubber particles, cleaning, wetting the surfaces, performing ultrasonic vibration spraying and the like. Under the condition of temperature or pressure, the rubber coated with the inert nano-particles can generate elastic deformation, the aperture plugging effect is good, and due to the fact that the shell is coated with the inert particles, the rubber cannot be dissolved in an oil phase, and the rubber still has good elastic deformation capacity and plugging performance under the condition of long-time high-temperature and high-pressure soaking in oil-based drilling fluid.

Description

technical field [0001] The invention relates to an elastic-plastic plugging particle for oil-based drilling fluid and a preparation method thereof, in particular to a plugging material with good elastic-plastic performance for oil-based drilling fluid. Background technique [0002] In recent years, with the progress of oil and gas exploration and development, the number of deep wells and wells in complex formations has gradually increased; various complex accidents have occurred frequently during the drilling construction process, especially the problem of lost circulation. The number of lost wells, the amount of lost wells, and the lost time are all high, and the plugging effect is not ideal, which not only causes huge economic losses, but also greatly delays the process of exploration and development. [0003] At present, the commonly used plugging materials mainly include bridging plugging materials, high water loss plugging materials, temporary plugging materials to prot...

Claims

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Application Information

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IPC IPC(8): C09K8/03C09K8/32
CPCC09K8/03C09K8/32
Inventor 李公让李文博于雷孙丙向田辉王锡洲王旭东王承俊李炳太李海斌刘振东高凯李春光李卉
Owner CHINA PETROLEUM & CHEM CORP
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