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Knotted temporary plugging ball for staged fracturing in oil and gas fields, method and application

A technology of temporarily blocking balls and knots, which is applied in the direction of earthwork drilling, wellbore/well components, and production fluids, etc. High sealing efficiency, improved sealing effect, and improved production capacity

Active Publication Date: 2022-06-28
古莱特科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The temporary plugging ball is usually a regular hard ball, but due to the complexity of the perforation hole, the plugging of the blast hole often fails
In fact, the perforation hole is not a regular round hole, and has certain burrs, so that the regular ball temporary blocking ball cannot be effectively set
[0003] High displacement and large sand volume are often used in the fracturing process, which has a great effect on the jet cutting of the hole, causing diameter expansion and irregular deformation of the hole, making it difficult to achieve effective plugging with the regular ball temporary plugging ball designed for the original hole , and it is easy to be dropped by subsequent sand-carrying liquid and fail
[0004] Through the search, no patent publications related to the patent application of the present invention have been found

Method used

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  • Knotted temporary plugging ball for staged fracturing in oil and gas fields, method and application
  • Knotted temporary plugging ball for staged fracturing in oil and gas fields, method and application
  • Knotted temporary plugging ball for staged fracturing in oil and gas fields, method and application

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preparation example Construction

[0043] The above-mentioned preparation method of the knotted temporary plugging ball for staged fracturing in oil and gas fields, the steps are as follows:

[0044] Put the knot ball body into the ball grinder, pour the mixture of ethylene glycol, paraffin, and NP-30 melted at 70 °C, the mass ratio of the three is 7:1:2, and it is obtained after cooling. The knot temporarily blocks the ball.

[0045] The body of the knotted temporary blocking ball is wrapped into a spherical shape with a mixture of polyethylene glycol, paraffin, and NP-30 to ensure that the ball is thrown smoothly through the manifold to reach the blasthole position. The wrapping shell will dissolve quickly in the wellbore, and the shell will be broken after entering the blasthole, and the temporary blocking ball of the knot will be released to effectively block the blasthole.

[0046] The above-mentioned method for using the knotted temporary plugging ball for staged fracturing in oil and gas fields, the ste...

Embodiment 1

[0052] Preparation process of temporary blocking ball: Take the preparation of 20mm knotted temporary blocking ball suitable for 95℃ as an example:

[0053] Cut 160mm composite polyvinyl alcohol fiber, weigh 8g, wind the fiber longitudinally for 2 turns, wind it horizontally for 2 turns, pass through the upper and lower rope buckles for 2 turns, and tighten the two ends of the fiber to form a knot and temporarily block the ball. Put the knot temporarily blocking ball into a ball grinder with a diameter of 30mm, pour the mixture of ethylene glycol, paraffin, and NP-30 (mass ratio is 7:1:2) that has been melted at 70 °C. To temporarily block the ball.

Embodiment 2

[0055] Take the preparation of 22mm knotted temporary blocking ball suitable for 70℃ as an example:

[0056] Cut 200mm composite polyvinyl alcohol fiber, weigh 12g, wind the fiber longitudinally for 2 turns, wind it horizontally for 2 turns, pass through the upper and lower two rope buckles and wind it for 2 turns, and tighten the two ends of the fiber to form a knot and temporarily block the ball. Put the knot temporary blocking ball into a ball grinder with a diameter of 30mm, pour the mixture of polyethylene glycol, paraffin, and NP-30 (mass ratio is 7:1:2) melted at 70 ℃. After cooling That is, the temporary blocking of the ball.

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Abstract

The invention discloses a knotted temporary plugging ball used for staged fracturing of oil and gas fields. The knotted temporary plugging ball includes a knotted temporary plugging ball body and a wrapping shell, and the knotted temporary plugging ball body is wrapped and arranged in a wrapping Inside the casing, the wrapping casing wraps the knot temporary blocking ball body into a spherical shape, the wrapping casing can be dissolved in the shaft, and the wrapping casing can be broken after entering the blast hole, releasing the knot temporary blocking ball body; The plugging ball body is a flexible knot temporary blocking ball, which can be deformed and enter the irregular perforation hole under the action of pressure difference. The knot temporary blocking ball body in the knot temporary blocking ball of the present invention is a flexible knot temporary blocking ball. The problem of low sealing efficiency of ball blocking for irregular holes. The knotted temporary plugging ball of the invention can be applied to staged fracturing of oil and gas reservoirs to increase the productivity of oil and gas wells.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field stimulation, in particular to a knotted temporary plugging ball, method and application for staged fracturing in oil and gas fields. Background technique [0002] At present, in the process of staged fracturing in oil and gas fields, temporary plugging balls are often used to plug the perforation holes to realize staged fracturing. Temporary plugging balls are often regular hard balls, but due to the complexity of the perforation holes, the blasthole plugging often fails. In fact, the perforation holes are not regular round holes and have certain burrs, so that the regular spherical temporary blocking ball cannot be effectively set. [0003] In the fracturing process, high displacement and large sand volume are often used, which has a great effect on hole jet cutting, causing diameter expansion and irregular deformation of the hole, making it difficult for the regular spherical temporar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B33/13
CPCE21B43/26E21B33/13
Inventor 魏三林关海萍邓志勇初京义武星星张熙
Owner 古莱特科技股份有限公司
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