Dissoluble pressure building-up ball for conducting staged fracturing on shale gas well

A technology for staged fracturing and shale gas wells, which is applied in wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve problems such as flowback or grinding and milling pressure balls, and meet high pressure resistance and reliability Dissolving effect

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

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Problems solved by technology

[0003] The purpose of the present invention is to propose a dissolvable pressure-suppressing ball for staged fracturing of shale gas wells, so as to solve the problem of flowback or milling of pressure-suppressing balls in staged fracturing in the prior art, and realize pressure-suppressing The purpose of the ball can be controlled dissolution in the downhole environment
Aiming at the problem in the prior art that flowback or milling pressure-suppressing balls are required during staged fracturing, the present invention provides a dissolvable pressure-suffocating ball for staged fracturing of shale gas wells

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  • Dissoluble pressure building-up ball for conducting staged fracturing on shale gas well

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Embodiment 1

[0018] Such as figure 1 Shown is a dissolvable pressure-suppressing ball for staged fracturing of shale gas wells. The base material 1 for making the pressure-suppressing ball is metal Mg with a nucleus grain diameter of 60-100 μm, and the outer coating of the metal Mg grains is There is shell material 2 metal aluminum with a thickness of 10 μm, β-phase Fe is uniformly distributed in the gap of the metal aluminum, and the ratio of Mg, Al, and Fe is 5:3:2. In this embodiment, the above-mentioned material is used to make a pressure-suppressing ball with a diameter of 38.1mm for finite element analysis. The selected pure Mg material has an elastic modulus of 44.8GPa, a Poisson's ratio of 0.35, and an inner diameter of the ball seat of 35mm. The model analysis results show that when the sphere bears a pressure of 70MPa, the point of maximum stress is the contact point between the sphere and the surface of the ball seat, and the maximum stress value is 288MPa. The pressure-resisti...

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Abstract

The invention discloses a dissolvable pressure-holding ball for staged fracturing of shale gas wells. The base material for making the pressure-holding ball is metal Mg with a nucleus grain diameter of 60-100 μm, and the metal Mg grains are coated There is a shell material with a thickness of 10 μm, the corrosion rate of the shell material in a Cl-rich electrolyte solution is lower than that of the base material, and β-phase metal elements are evenly distributed in the gaps of the shell material, so The ratio of the matrix material, shell material, and β-phase metal elements is 5:3:2. The purpose of the present invention is to propose a dissolvable pressure-suppressing ball for staged fracturing of shale gas wells, so as to solve the problem of flowback or milling of pressure-suppressing balls in staged fracturing in the prior art, and realize pressure-suppressing Balls can be used for controlled dissolution purposes in downhole environments.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a dissolvable pressure-holding ball used for staged fracturing of shale gas wells. 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 the formation pressure. If the flow-back is not smooth, the ball seat and the pressure-h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C23/02C22C32/00E21B43/26
CPCC22C23/00C22C23/02C22C32/0036E21B43/26
Inventor 黄磊
Owner 黄磊
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