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Pressure-building ball used by fracturing of shale gas well

A technology for shale gas wells and pressure-holding balls, which is applied to wellbore/well valve devices, wellbore/well components, and production fluids, etc., can solve the problem of increasing construction costs and risks, slow milling speed, and prolonged construction period, etc. problems, to achieve the effect of good drillability, easy milling, and improved pressure bearing capacity

Inactive Publication Date: 2018-03-06
郭强
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the solid pressure ball has a stable structure and is not easily deformed. However, when it cannot be returned to the wellhead and needs to be milled, due to its solid structure, the milling speed is slow, resulting in a longer construction period and increased construction costs and risks; while the hollow pressure ball Although it is easy to mill, it is easy to deform under high pressure in the well, and there is a risk of being unable to hold the pressure

Method used

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  • Pressure-building ball used by fracturing of shale gas well
  • Pressure-building ball used by fracturing of shale gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 The shown pressure-holding ball used for shale gas well fracturing includes a hollow metal ball 1, and a concentric solid metal ball 2 is arranged at the inner center of the hollow metal ball 1, and the surface of the solid metal ball 2 is It is connected to the inner surface of the hollow metal ball 1 through 24 evenly distributed metal rods 3 . The hollow metal ball 1, the solid metal ball 2, and the metal rod 3 are all made of metal copper; the diameter of the solid metal ball 2 is 1.5 cm. This embodiment includes a large hollow metal ball 1 and a small solid metal ball 2, the solid metal ball 2 is located at the inner center of the hollow metal ball 1, and is composed of several hollow metal balls protruding inward from the inner surface of the hollow metal ball 1. , the metal rods 3 with equal length and uniform distribution fix the solid metal ball 2 at its central position. The metal rod 3 is used to support and disperse the external pressure r...

Embodiment 2

[0021] Such as figure 2 Shown is a pressure holding ball used in shale gas well fracturing. On the basis of Example 1, the space between the hollow metal ball 1 and the solid metal ball 2 is filled with metal powder 4 . In this embodiment, the hollow part of the hollow metal ball 1 is tightly filled with metal powder, so that the hollow metal ball 1 can be completely and comprehensively supported, ensuring its pressure bearing capacity and avoiding its easy deformation. At the same time, since the filler is in the form of powder, when grinding and milling the pressure ball, after grinding the shell of the hollow metal ball 1, the powdery material will not cause any interference to the milling, and it will not interfere with the grinding and milling of tools such as drill bits or grinding shoes. Under the hydraulic impact of the nozzle, the powdered metal will be easily dispersed, so as to further improve its pressure bearing capacity without affecting the advantages of the in...

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Abstract

The invention discloses a pressure holding ball used in shale gas well fracturing, which comprises a hollow metal ball, a concentric solid metal ball is arranged at the inner center of the hollow metal ball, and the surface of the solid metal ball is uniformly distributed Several metal rods are connected to the inner surface of the hollow metal ball. The invention fixes the solid metal ball at its central position through a number of metal rods extending inward from the inner surface of the hollow metal ball with equal length and even distribution, so as to realize the purpose of not easily deforming the pressure-holding ball and being easy to mill.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a pressure holding ball used for shale gas well fracturing. Background technique [0002] In shale oil and gas, low-permeability reservoir directional well, horizontal well fracturing and stimulation process, multi-stage sliding sleeve staged fracturing technology is often used. The ball-throwing fracturing sleeve is the key workpiece in the staged fracturing technology. The pressure-suppressing balls with diameters ranging from small to large are sequentially dropped into the wellhead, and the sliding sleeves of each stage are opened in turn, and then the subsequent fracturing operation is carried out. After the fracturing of all production layers is completed, the pressure-holding ball will return to the wellhead under the action of formation pressure. If the flow-back is not smooth, the ball seat and the pressure-holding ball will be drilled...

Claims

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Application Information

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IPC IPC(8): E21B34/14E21B43/26
CPCE21B34/14E21B43/26
Inventor 郭强
Owner 郭强