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A mixed fracturing method for proppant with multiple particle sizes

A technology of proppant and multi-particle size, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problems of rapid production decline, low conductivity of fracture system, single particle size of proppant, etc., to achieve Improve effectiveness, avoid adverse effects, and ensure matching effects

Active Publication Date: 2022-05-03
CHINA PETROLEUM & CHEM CORP +1
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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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  • A mixed fracturing method for proppant with multiple particle sizes
  • A mixed fracturing method for proppant with multiple particle sizes
  • A mixed fracturing method for proppant with multiple particle sizes

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Embodiment

[0088] Well Z is a marine shale gas horizontal 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 average brittle mineral content of the well target layer is 69.2%, Young's modulus is 19.1-24.5GPa, Poisson's ratio is 0.25-0.27, the maximum horizontal principal stress is 62MPa, the minimum horizontal principal stress is 52MPa, the vertical stress is 67MPa, and the horizontal stress difference is 10MPa. The coefficient of stress difference is 19%. The imaging logging shows that the horizontal bedding of the target layer is developed, and there are high conductivity fractures and high resistivity fractures in some intervals. Overall, this well is conducive to volume stimulation. Using the patent provided by this patent to carry out mixed fracturing construction of multi-particle size proppant in this well, the specific implementation steps are as follows ( figure 1 This is t...

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Abstract

The invention discloses a mixed fracturing method of proppant with multiple particle diameters. Including: (1) evaluation of brittleness, natural fractures and horizontal stress difference; (2) injection of low-viscosity slick water into prefabricated fractures; (3) injection of 70‑140 mesh proppant or 140‑210 mesh proppant; (4) Mixed injection stage of 70-140 mesh and 40-70 mesh proppant; (5) 30-50 mesh + 40-70 mesh or 30-50 mesh + 40-70 mesh + 70-140 mesh injection stage. In the present invention, by optimizing the combination of different proppant particle sizes, the proppant with various particle sizes enters the matching multi-scale fractures sequentially, so as to realize the filling and propping of fractures of different scales in main fractures and micro-fractures during the fracturing process, and further improve the hydraulic pressure. Effectiveness of crack opening system. Increase the effective coverage of fractures on oil and gas reservoirs, increase production, and delay decline.

Description

technical field [0001] The invention relates to the technical field of shale gas development, and furthermore, relates to a hybrid fracturing method of proppant with multiple particle sizes. Background technique [0002] The proppant used in the current hydraulic fracturing process has a single particle size. Conventional sandstone reservoir fracturing usually uses 20-40 mesh or 30-50 mesh proppant. 3 The 70-140 mesh (usually referred to as 100 mesh) powder pottery is used to reduce the friction and fluid loss of curved fractures; for shale reservoir fracturing, although 70-140 mesh, 40-70 mesh and 30-50 mesh are commonly used Sand is added to the proppant combination, but the three particle sizes are mainly added in the order of construction time according to the pump injection procedure. For each pump injection stage, a single proppant sand addition strategy is still used. Although the injection construction mode of the above-mentioned fracturing proppant has achieved a c...

Claims

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Application Information

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Patent Type & Authority Patents(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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