A composite reinforced plugging slurry and plugging method

A technology of plugging slurry and base slurry, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of gravity settlement, incomplete filling of cracks, and easy accumulation of plugging materials at the bottom of crack spaces, etc. problem, to achieve the effect of reducing the accumulation

Active Publication Date: 2021-10-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pressure-bearing plugging agent integrates different plugging mechanisms, and can automatically adjust and match it according to the shape and size of the leakage channel. In addition, it does not consider the suspension and dispersion of plugging materials during the pumping process, and the phenomenon of "gravity settlement" is prone to occur during the transportation process in the well fluid, and the plugging materials are easy to accumulate at the bottom of the fracture space, which is not good for fracture filling. Complete, uneven, still need specific working fluid

Method used

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  • A composite reinforced plugging slurry and plugging method
  • A composite reinforced plugging slurry and plugging method

Examples

Experimental program
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Effect test

Embodiment 1

[0033] A composite enhanced plugging slurry, aiming at drilling fluid loss rate greater than 0 and less than or equal to 10.0m 3 Permeability leakage per hour, including the following raw materials by weight: 100 parts of base slurry, 6 parts of expandable plugging enhancer HJK-5(Ⅱ), 3 parts of inorganic plugging agent FDL, 3 parts of composite plugging agent, 1 part of thickener, 5 parts of consolidation agent A, 8 parts of consolidation agent B;

[0034] The base slurry is prepared by mixing sodium bentonite and water, and the mass content of the sodium bentonite in the base slurry is 4%.

[0035] The average particle size of the expandable plugging enhancer HJK-5(II) is 1.5-2.0mm.

[0036] The average particle size of the inorganic plugging agent FDL is 1.0-1.4mm, and the average density is 2.6 / cm 3 , the preparation method is as follows: mix mica flakes, expansive vermiculite, and shell fragments in a mass ratio of 1:1:2, and then grind and screen to obtain the inorganic...

Embodiment 2

[0043] A composite enhanced plugging slurry, aimed at drilling fluid loss rate greater than 10.0 and less than or equal to 25.0m 3 / h of fracture leakage, including the following raw materials by weight: 100 parts of base slurry, 12 parts of expandable plugging enhancer HJK-5 (Ⅱ), 5 parts of inorganic plugging agent FDL, 5 parts of composite plugging agent, 2.5 parts of thickener, 10 parts of consolidation agent A, 16 parts of consolidation agent B;

[0044] The base slurry is prepared by mixing sodium bentonite and water, and the mass content of the sodium bentonite in the base slurry is 4%.

[0045] The average particle size of the expandable plugging enhancer HJK-5(II) is 4.0-4.5mm.

[0046] The average particle size of the inorganic plugging agent FDL is 2.5-3.0mm, and the average density is 2.6g / cm 3 , the preparation method is as follows: mix mica flakes, expansive vermiculite, and shell fragments in a mass ratio of 1:1:2, and then grind and screen to obtain the inorga...

Embodiment 3

[0053] A composite enhanced plugging slurry, aiming at drilling fluid loss rate greater than 25.0 and less than or equal to 40.0m 3 / h fracture leakage, including the following raw materials by weight: 100 parts of base slurry, 15 parts of expandable plugging enhancer HJK-5 (Ⅱ), 8 parts of inorganic plugging agent FDL, 8 parts of composite plugging agent, 5 parts of thickener, 15 parts of consolidation agent A, 20 parts of consolidation agent B;

[0054] The base slurry is prepared by mixing sodium bentonite and water, and the mass content of the sodium bentonite in the base slurry is 4%.

[0055] The average particle size of the expandable plugging enhancer HJK-5(II) is 6.5-7.0mm.

[0056] The average particle size of the inorganic plugging agent FDL is 4.5-5.0mm, and the average density is 2.6g / cm 3 , the preparation method is as follows: mix mica flakes, expansive vermiculite, and shell fragments in a mass ratio of 1:1:2, and then grind and screen to obtain the inorganic ...

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Abstract

The invention provides a composite strengthened plugging slurry and a plugging method, comprising the following raw materials in parts by weight: 100 parts of base slurry, 5 to 15 parts of expandable plugging enhancer HJK‑5 (II), and inorganic plugging agent FDL 2-10 parts, 2-10 parts of composite plugging agent, 0.5-8 parts of thickener, 5-20 parts of cementing agent A, and 5-25 parts of cementing agent B. The present invention adopts bridge plugging materials with different properties and particle sizes and carries out gradation research, so that the cracked leakage with different leakage volume can be used in a targeted manner, while saving the plugging cost, it has higher plugging efficiency and Plugging strength.

Description

technical field [0001] The invention relates to a composite reinforced plugging slurry and a plugging method, belonging to the drilling fluid plugging technology in the field of petroleum exploration and development. Background technique [0002] With the continuous deepening of oil and gas exploration and development at home and abroad, the problem of lost circulation is becoming more and more prominent in the drilling process. Lost circulation will cause drilling fluid to enter the formation from the lost channel in the wellbore, and will consume a lot of mud and plugging materials on site to deal with the lost circulation problem, which greatly increases the cost of drilling construction; in addition, lost circulation will also reduce drilling The speed consumes a lot of operating time and may even cause a series of complex accidents such as blowout and well collapse, which will seriously lead to the scrapping of the entire wellbore and bring huge human and material losse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/467E21B33/138
CPCC09K8/467E21B33/138
Inventor 白英睿孙金声尚校森吕开河金家锋
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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