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A Method of Selecting Perforation Orientation for Fracturing of Inclined Wells

A deviated well and azimuth technology, which is applied in the direction of earthwork drilling, wellbore/well components, production fluid, etc., can solve the problem of no formation, no comprehensive consideration of fracturing fluid seepage, pore pressure changes, construction parameters, start-up pressure gradient, etc. question

Active Publication Date: 2018-08-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] None of the above methods comprehensively consider the comprehensive effects of wellbore structure, in-situ stress, fracturing fluid percolation, pore pressure change, construction parameters, start-up pressure gradient, etc. method of perforation azimuth

Method used

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  • A Method of Selecting Perforation Orientation for Fracturing of Inclined Wells
  • A Method of Selecting Perforation Orientation for Fracturing of Inclined Wells
  • A Method of Selecting Perforation Orientation for Fracturing of Inclined Wells

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Embodiment

[0155] Well XX is a pre-exploration well. The 3900-4048m of the inclined well is used to illustrate the application of the invention patent. The buried vertical depth and density basic data of this well section are shown in Table 1. The results of shear wave time difference, dynamic Poisson's ratio, dynamic Young's modulus, static Poisson's ratio, and static Young's modulus calculated by the patent of the present invention are shown in Table 1.

[0156] Table 1 Rock mechanics results of well XX well (3900-4048m) mechanical parameters logging calculation

[0157]

[0158]

[0159]

[0160]

[0161] Table 2 is the tectonic stress coefficient of this block obtained from the fracturing data of adjacent wells.

[0162]Table 2 Structural stress coefficients calculated by inversion of fracturing data in adjacent wells of Well XX

[0163] Maximum horizontal principal stress tectonic stress coefficient k H

Minimal horizontal principal stress tectonic stress ...

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Abstract

The invention discloses a method for selecting the fracturing perforation orientation for an inclined shaft. The method comprises the following steps: 1, collecting data, including the hole drift angles, the azimuthal angles and the reservoir permeability, of a fracturing well section of the inclined shaft, calculating the main terrestrial stresses of original fields of three far fields of the inclined shaft through inclined shaft logging and adjoining well fracturing tectonic stress coefficient data, and collecting the fracturing fluid viscosity parameter and the construction displacement parameter; 2, transferring the terrestrial stresses of the original fields of the three far fields into an inclined shaft rectangular coordinate system, so that six corresponding stress components are obtained; 3, calculating a shaft peripheral stress distribution model of an inclined shaft perforation well section in the process of injecting fracturing fluid into the inclined shaft; 4, calculating the fracture pressure of inclined shaft fracturing at different perforation azimuthal angles, and selecting the orientation where the fracturing pressure is the minimum as the optimal perforation orientation of inclined shaft fracturing. By means of the technical scheme of the method, optimization of inclined shaft fracturing perforation orientation can be achieved rapidly, the problem that the inclined shaft fracturing effect is not good is effectively solved, thereby the basis is provided for optimization of inclined shaft fracturing perforation orientation, and the reservoir reconstruction effect is improved.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for selecting the perforation orientation for fracturing of deviated wells. Background technique [0002] Fracturing after perforating deviated wells can significantly improve the development effect of low-permeability oil and gas reservoirs. Improper selection of perforation orientation in deviated wells will lead to excessively high formation fracture pressure, formation of multiple fractures, and spatial diversion, resulting in increased near-wellbore friction and pump pressure, increased fracturing risks and reduced stimulation effects. The optimization of perforation azimuth for deviated well fracturing is closely related to parameters such as in-situ stress of fracturing section, deviated well azimuth, well deviation, reservoir permeability, construction displacement, and fracturing fluid viscosity. [0003] The acquisition of in-situ str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/119E21B49/00
CPCE21B43/119E21B49/087
Inventor 曾凡辉郭建春李超凡
Owner SOUTHWEST PETROLEUM UNIV
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