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Shell-membrane structure plugging material as well as preparation method and use method thereof

A plugging material and shell membrane technology, which is applied in the field of oil and gas drilling engineering, can solve the problems of loss of drilling fluid, economic loss, and impact on the exploration and development process, and achieve the effect of cost saving and time saving

Active Publication Date: 2021-03-12
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lost circulation is one of the most common and common technical problems in oil and gas drilling engineering. It will not only increase drilling time, lose drilling fluid, interfere with geological logging work, but may also cause a series of downhole complex problems such as obstruction, drill sticking, and well collapse. Severe incidents will lead to downhole accidents such as blowout and wellbore scrapping, which will cause major economic losses and affect the exploration and development process. The annual loss caused by well leakage in the world is more than hundreds of millions of dollars.
From several large lost zones in an oil and gas field, according to statistics, the loss of plugging materials in a certain year is nearly 50 million yuan, and the average loss time of single well plugging is nearly 200 hours, which seriously increases the cost of drilling

Method used

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  • Shell-membrane structure plugging material as well as preparation method and use method thereof

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Experimental program
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Effect test

Embodiment 1

[0024] A plugging material with a shell-membrane structure, including aluminum film, Fe 3 o 4 and gelatin; the Fe 3 o 4 Wrap a layer of gelatin to form a capsule with gelatin as the shell and an inner cavity; Fe wrapped in gelatin 3 o 4 An aluminum film is wrapped outside, and a layer of gelatin is wrapped outside the aluminum film.

[0025] The size and direction of the magnetic field at the bottom of the well are basically stable, and the direction is basically north-south. After a magnetic field passes through the medium, its strength and direction will change. When several magnetic media Fe are put into the bottom hole fracture 3 o 4 After that, the magnetic medium Fe 3 o 4 Under the force of different sizes and directions at the bottom of the well, fixed structures of different shapes are formed in the fractures.

[0026] The mechanism of action of the aluminum film is as follows:

[0027] The main function of the aluminum film is to coat the shielding magnetic...

Embodiment 2

[0035] A kind of shell membrane structure plugging material, on the basis of embodiment one: described Fe 3 o 4 It is composed of Fe in the shape of ring, triangle, square, isosceles trapezoid, cylinder or prism 3 o 4 mixed.

[0036] In actual use, various shapes of Fe 3 o 4 , so that Fe 3 o 4 After entering the crack, the structure is more stable and can be fixed better.

Embodiment 3

[0038] A plugging material with a shell-membrane structure, on the basis of Example 1: the Fe packaged with gelatin 3 o 4 It is a sphere with a diameter of 2-20mm and a density of 0.92-2.1g / cm 3 .

[0039] Further, the Fe wrapped in gelatin 3 o 4 The sphere is filled with nitrogen gas.

[0040] In actual use, the use of industrial latex is beneficial to the bonding of crack skeletons and plugging materials, and is conducive to improving the plugging speed and pressure bearing capacity of cracks. gelatin-coated Fe 3 o 4 Adopting the technical scheme of a sphere with a diameter of 2-20mm, the production price is relatively cheap, and the density is stable after being mixed with the drilling fluid, which can be organically matched with the drilling fluid to better realize plugging.

[0041] gelatin-coated Fe 3 o 4 Nitrogen gas is injected into the inside of the sphere, and the density of the material is somewhat changed by the nitrogen gas injected, which facilitates the...

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Abstract

The invention belongs to the technical field of oil and gas drilling engineering, and particularly relates to a shell-membrane structure plugging material as well as a preparation method and a use method thereof. The composite material comprises an aluminum film, Fe3O4 and gelatin, the Fe3O4 is coated with a layer of gelatin, the Fe3O4 coated with the gelatin is coated with the aluminum film, andthe aluminum film is coated with a layer of gelatin. According to the invention, under the action of an earth magnetic field, magnetic media Fe3O4 with different shapes, different proportions and different particle grades injected into cracks are rapidly magnetized to rapidly form a relatively stable netty three-dimensional plugging framework with certain pressure bearing capacity, the cracks arefilled with the magnetic media Fe3O4, and the magnetic media Fe3O4 are matched with a liquid-phase plugging agent to realize rapid plugging, so that not only is the plugging time saved, but also the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas drilling engineering, and in particular relates to a plugging material with a shell-membrane structure, a preparation method and a use method. Background technique [0002] Lost circulation is one of the most common and common technical problems in oil and gas drilling engineering. It will not only increase drilling time, lose drilling fluid, interfere with geological logging work, but may also cause a series of downhole complex problems such as obstruction, drill sticking, and well collapse. If the incident is serious, it will also lead to downhole accidents such as blowout and wellbore scrapping, which will cause major economic losses and affect the exploration and development process. The annual loss caused by well leakage in the world is more than hundreds of millions of dollars. Just from several large lost zones in a certain oil and gas field, according to statistics, the loss of pluggin...

Claims

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Application Information

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IPC IPC(8): C09K8/42B01J13/04
CPCC09K8/426B01J13/04
Inventor 张燕娜欧阳勇高云文王勇茗段志锋黄占盈艾磊陈春宇宫臣兴
Owner PETROCHINA CO LTD
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