Method for selecting fracturing perforation orientation for inclined shaft

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...

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Problems solved by technology

Luo Tianyu (Luo Tianyu, Guo Jianchun, Zhao Jinzhou, et al. Research on perforation fracture pressure and crack initiation location of inclined well casing[J]. Acta Petroleum Sinica, 2007, 28(1): 139-142; [4] 12. Hubbert, M.K. ,Willis,D.G.:Mechanicsofhydraulicfracturing,Trans.AIME,1957,210,153-166.) fully considered the influence of factors such as in-situ stress, wellbore trajectory, operating conditions and well completion methods when predicting the fracture pressure of deviated wells. When considering the influence of reservoir permeability on fracture pressure, it is considered as two critical values ​​of coefficient 0 (non-permeable formation) and 1 (permeable formation), but in the actual formation, the permeability performance has a large range, so it is different from the actual situation. There is a large deviation

[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

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