Method for manufacturing soluble tripping ball used for staged fracturing of shale gas well
A technology for staged fracturing and shale gas wells, applied in earthwork drilling, wellbore/well components, production fluids, etc.
Inactive Publication Date: 2016-06-01
CHENGDU CHUANGYUAN OIL & GAS TECH DEV
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[0003] The purpose of the present invention is to propose a method for making soluble pressure-suppressing balls used in staged fracturing of shale gas wells, so as to solve the problem in the prior art that flowback or milling of pressure-suppressing balls is required during staged fracturing, and to realize pressure-suffocating The pressure ball can be controlled and dissolved 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 method for making soluble pressure-suffocating balls used in staged fracturing of shale gas wells. The pressure-suppressing ball can meet the requirements of high-pressure resistance and dissolvability, and realize the purpose of the controllable dissolution of the pressure-suppressing ball in the downhole environment
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Embodiment 1
[0021] Such as figure 1 Shown is a method for making soluble pressure-suffocating balls used in staged fracturing of shale gas wells. The method includes the following steps: (a) using metal magnesium powder with a grain diameter between 60 and 100 μm as a nuclei crystal ( 1) Al or / and Al with a grain diameter of 10 μm 2 o 3 The powder is used as the shell crystal (2), and the core-shell coating is carried out to obtain a composite powder; (b) the β-phase metal powder (3) is added to the composite powder and mixed uniformly; (c) the alloy forming agent is added and mixed until uniform, and the The powder is placed in the mold and pressed into shape; (d) Heating the pressed body to 400~600°C in a vacuum heating furnace, and then cooling to room temperature to obtain the finished green body material; (e) The completed green body The green body material is made into a spherical shape. In this embodiment, the finite element analysis is carried out on the 38.1mm-diameter pressur...
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Abstract
The invention discloses a method for manufacturing a soluble tripping ball used for staged fracturing of a shale gas well. The method comprises the steps that metal Mg powder with the grain diameter of 60 micrometers to 100 micrometers is used as nuclear crystals, Al and / or Al2O3 powder with the diameter of 10 micrometers is used as shell crystals, and beta-phase metal elements are added to the crystals to be mixed evenly; and press-forming is carried out, the mixture is heated to 400 DEG C to 600 DEG C in a vacuum heating furnace, the mixture is cut and ground to be spherical after being cooled to room temperature, and the tripping ball capable of being gradually dissolved under the well can be obtained. The problem that during staged fracturing in the prior art, a tripping ball needs to flow back or be milled can be solved, and the aim that the tripping ball can be controllably dissolved in the underground environment is achieved.
Description
technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for manufacturing a soluble pressure-suffocating ball used in 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 ba...
Claims
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IPC IPC(8): B22F1/02B22F3/02B22F3/10E21B43/26
CPCE21B43/26B22F3/02B22F3/10B22F2998/10B22F1/17B22F1/16B22F1/0003
Inventor 雷一文罗迪
Owner CHENGDU CHUANGYUAN OIL & GAS TECH DEV