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Multi-particle-size proppant mixed fracturing method

A proppant, multi-particle size technology, used in earth-moving drilling, production fluids, wellbore/well components, etc., can solve the problem of rapid production decline, single proppant particle size, and ineffective micro-fracture or micro-fracture system support and other issues

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the problem that micro-fractures or micro-fracture systems cannot be effectively supported due to single proppant particle size, improper design and application ratio of proppant with different particle Technical problems such as low diversion capacity of the system and rapid production decline

Method used

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  • Multi-particle-size proppant mixed fracturing method

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Embodiment

[0088] Well Z is a horizontal marine shale gas well. The target layer of this well is the Lower Silurian Longmaxi Formation-Upper Ordovician Wufeng Formation, with a vertical depth of 2626.80-2707m. The target layer of the well has an average brittle mineral content of 69.2%, Young's modulus 19.1-24.5GPa, Poisson's ratio 0.25-0.27, maximum horizontal principal stress 62MPa, minimum horizontal principal stress 52MPa, vertical stress 67MPa, horizontal stress difference 10MPa, horizontal The stress difference coefficient is 19%. Imaging logging shows that the target layer has developed horizontal bedding, and there are high-conductivity fractures and high-resistance fractures in some intervals. In general, the well is conducive to volume modification. Using the patent provided by this patent to perform multi-particle proppant mixed fracturing construction on this well, the specific implementation steps are as follows ( figure 1 This is the schematic diagram of the typical fractu...

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Abstract

The invention discloses a multi-particle-size proppant mixed fracturing method. The method comprises the following steps: (1) evaluating brittleness, natural cracks and horizontal stress difference; (2) injecting low-viscosity slickwater into a pre-formed joint; (3) injecting a 70-140 mesh proppant or 140-210 mesh proppant; (4) conducting mixed injection of the 70-140 mesh proppant and 40-70 meshproppant; and (5) injecting a mixture of a 30-50 mesh proppant and a 40-70 mesh proppant or a mixture of a 30-50 mesh proppant, a 40-70 mesh proppant and a 70-140 mesh proppant. Different proppant particle size combinations are optimized, proppants with various particle sizes enter multi-scale cracks matched with the proppant particle sizes in sequence, filling and supporting of different-scale cracks of main cracks and micro cracks in the fracturing process are achieved, and the effectiveness of a fracturing and cracking system is further improved. The effective coverage of cracks on an oil-gas reservoir is increased, the yield is improved, and progressive decrease is delayed.

Description

Technical field [0001] The invention relates to the technical field of shale gas development, and more particularly, to a multi-particle proppant mixed fracturing method. Background technique [0002] The current hydraulic fracturing process uses a single proppant particle size. Conventional sandstone reservoir fracturing usually uses 20-40 mesh or 30-50 mesh proppant, and sometimes 2-3m is added in the pre-fluid stage according to process needs. 3 70-140 mesh (usually called 100 mesh) powder ceramics are used to reduce the friction and fluid loss of bending fractures; for shale reservoir fracturing, although 70-140 mesh, 40-70 mesh and 30-50 are commonly used Target proppant combination sanding, but the three particle sizes are mainly added in the order of construction time according to the pump injection procedure. For each pumping stage, it is still a single proppant sanding strategy. Although the above-mentioned fracturing proppant injection construction mode has achieved a c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/267
Inventor 蒋廷学王海涛李双明卞晓冰李奎为苏瑗刘红磊周林波
Owner CHINA PETROLEUM & CHEM CORP
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