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An optimization method for shale gas horizontal well perforation cluster distances

An optimization method and technology for shale gas wells, applied in the directions of instrumentation, data processing application, prediction, etc., can solve the problems of increasing the fracture pressure of the reservoir, not proposing the design cluster spacing, etc., and achieve the effect of improving production.

Inactive Publication Date: 2017-12-22
CHINA PETROLEUM & CHEM CORP +1
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Benefits of technology

The technical effect of this patented method involves combining both compression stress from multiple stages of drilling with fluid injection into one hole for better oil recovery during hydraulic stimulation operations or increasing productivity through more efficient extraction methods such as vertical wellbores.

Problems solved by technology

This patented describes different ways to improve the efficiency with which hydrocarbons from underground formations are produced through drilling operations during production or injection into subterranean geology. However, there currently exist many challenges related to optimizing the placement of multiple small groups within specific intervals along certain paths on horizontally oriented boreholes used for producing these fluids.

Method used

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  • An optimization method for shale gas horizontal well perforation cluster distances
  • An optimization method for shale gas horizontal well perforation cluster distances
  • An optimization method for shale gas horizontal well perforation cluster distances

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Embodiment Construction

[0073] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0074] Such as Figure 8 Shown, the inventive method is specifically as follows:

[0075] (1) Horizontal well fracture pressure prediction method considering stress interference

[0076] 1.1 Analysis of perforated wellbore geometric model

[0077] Assuming that there is good communication between the wellbore and the perforated hole, that the wellbore and the perforated channel have the same fluid pressure, and that there is a microannulus between the cement sheath and the perforated hole before the fracture initiates, the perforated wellbore is considered to be two holes of different sizes Perpendicular intersecting, perforated wellbore geometry and its stress redistribution as Picture 1-1 and Figure 1-2 shown. Among them, σ z is the wellbore axial stress, σ θ is the wellbore tangential stress, σ θ′ is the perforation tangential stress, σ θl is the concentr...

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Abstract

The invention provides an optimization method for shale gas horizontal well perforation cluster distances and belongs to the field of well completion in the petroleum industry. The method comprises the steps of: (1) building cracking pressure prediction models of shale gas well perforation, considering the influence of stress disturbance, and analyzing and comparing cracking pressure with stress disturbance being considered and cracking pressure without stress disturbance being considered to obtain the influence of stress disturbance on cracking pressure; (2) based on the theories of rock mechanics and the principles of oil production engineering, considering the influence of stress disturbance, analyzing mechanical conditions under which multistage cluster perforation and subsequent fracturing generate network cracks and building crack diverting areas; (3) acquiring the optimal cluster distance of horizontal well multistage perforation based on cracking pressure. Thus, network crack generation of subsequent fracturing is maximized and the yield of shale gas is increased.

Description

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Claims

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Application Information

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Owner CHINA PETROLEUM & CHEM CORP
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