Fracturing ball capable of completely degrading and preparation method thereof

A completely degradable, fracturing ball technology, applied in the field of fracturing balls, can solve the problems of fracturing ball deformation, production decline, recovery or removal of fracturing balls, etc., and achieve high pressure difference strength and good sealing stability Effect

Inactive Publication Date: 2016-03-30
CNPC BOHAI DRILLING ENG
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Problems solved by technology

[0003] The above-mentioned conventional fracturing balls have the following problems: (1) In multi-stage hydraulic fracturing, when the ball speed changes suddenly, the fracturing balls made of nylon and other materials will deform and get stuck in the sliding sleeve to block the production channel after fracturing. (2) When the length of the horizontal well section is long or the number of fracturing stages is large, it will become

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  • Fracturing ball capable of completely degrading and preparation method thereof
  • Fracturing ball capable of completely degrading and preparation method thereof
  • Fracturing ball capable of completely degrading and preparation method thereof

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Embodiment Construction

[0048] attached figure 1 Infrared spectrum of polyglycolide. 3351cm -1 It is the stretching vibration peak of -OH, 2938cm -1 and 2873cm -1 Respectively CH 2 The antisymmetric and symmetric stretching vibration peaks of the , 1718cm -1 , 1672cm -1 with 1574cm -1 It is the stretching vibration peak of the carbonyl group, 1410cm -1 for CH 2 The bending vibration peak of , 1253cm -1 with 1036cm -1are the antisymmetric and symmetric stretch vibration peaks of the C-O-C group, respectively.

[0049] attached figure 2 H NMR spectrum of polyglycolide. deuterated trifluoroacetic acid (CF 3 COOD) as the solvent and tetramethylsilane (TMS) as the internal standard, the molecular structure of polyglycolide was analyzed by H-NMR spectroscopy. The proton resonance peak corresponding to the chemical shift at 5.06 is CH 2 The hydrogen on the surface indicates that the molecular structure of the polymer material contains methylene structural units.

[0050] attached image 3 ...

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Abstract

The present invention discloses a fracturing ball capable of completely degrading and a preparation method thereof, the fracturing ball comprises polyglycolide, and the degradation mechanism of fracturing ball is not electrochemical reaction, but belongs to hydrolysis reaction; the fracturing ball can completely auto-degrade in water environment with different pH values, the recycle processing of the fracturing ball is not needed, and the fracturing ball can completely degrade into water and carbon dioxide without any residue and any harm to a reservoir and the environment; anti-differential pressure strength of the fracturing ball is large, the fracturing ball is free of deformation under the differential pressure of 70MPa, and the fracturing ball is good in stability in sealing with a ball seat, and can ensure normal opening of a sliding sleeve and blocking of a fractured layer to achieve the fractional fracturing purpose; in addition, the present invention provides three biodegradable polymer fracturing ball processing molding methods, and the methods have the advantages of short cycle, continuous mass production, high production efficiency, relatively simple equipment structure and relatively easy operation and the like.

Description

technical field [0001] The invention relates to a fracturing ball used in the field of stimulation measures for oil and gas wells, in particular to a fully degradable fracturing ball and a preparation method thereof. Background technique [0002] Packer + sliding sleeve layered fracturing technology can achieve the purpose of multi-layer fracturing in one trip, and has the advantages of simple operation, good sealing effect and low operating cost. Balls are one of the key factors in determining whether fracking is successful or not. At present, there are two main types of fracturing balls commonly used in stimulation measures: (1) steel balls. The material is mainly low carbon steel, which is characterized by high bearing strength, good temperature resistance, not easy to deform, and low price; (2) resin ball. Such as phenolic resin ball and its composite ball, epoxy resin ball and its composite ball, nylon ball, polyether ether ketone ball, glass fiber or carbon fiber rei...

Claims

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Application Information

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IPC IPC(8): B29C43/02B29C45/00B29C47/40B29C47/14C08G63/08E21B43/26B29C48/305
Inventor 邹鹏张世林王林王玉忠高秀君马金良
Owner CNPC BOHAI DRILLING ENG
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