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Volume alternating fracturing method of horizontal well in experimental shale reservoir

A volume fracturing and horizontal well technology, applied in the field of mineral resources, can solve the problems of perforation spacing and fracture extension length that do not realize the induced stress field

Active Publication Date: 2017-05-10
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0006] None of the above volume fracturing schemes for horizontal wells in shale reservoirs can organically combine the induced stress field generated by hydraulic fracture propagation, the perforation spacing and fracture propagation length in the same fracturing stage.

Method used

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  • Volume alternating fracturing method of horizontal well in experimental shale reservoir
  • Volume alternating fracturing method of horizontal well in experimental shale reservoir
  • Volume alternating fracturing method of horizontal well in experimental shale reservoir

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Embodiment

[0169] In this embodiment, the method for improving the effect of volume fracturing of horizontal wells in shale reservoirs is applied, specifically as follows:

[0170] The basic parameters of a shale reservoir are as follows: the maximum and minimum horizontal principal stresses are 50MPa and 45MPa respectively, the Poisson's ratio of the rock is 0.25, and the Young's modulus is 2.0×10 4 MPa, rock tensile strength is 3MPa, rock cohesion is 10MPa, friction coefficient of natural fracture wall is 0.9, natural fracture length is 10m, approach angle is 60°, hydraulic fracture length is 60m, fluid net pressure is 5MPa, image 3 is the physical model of the distribution of hydraulic fractures around the wellbore in the embodiment.

[0171] 1. The effect of principal stress difference on the opening and failure of natural fractures

[0172] Figure 4 The influence of different stress differences on the normal stress of the natural fracture wall is characterized, from Figure 4 I...

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Abstract

The invention discloses a volume alternating fracturing method of a horizontal well in an experimental shale reservoir. The method comprises the following steps: collecting the stratum parameter, the natural fracture parameter and the hydraulic fracture basic parameter of a reservoir; establishing stretching, shearing and pass through failure criterions of a natural fracture when a hydraulic fracture and the natural fracture are interacted, and quantitatively analyzing the influence on the natural fracture failure by a horizontal principal stress difference; establishing a hydraulic fracture induced stress calculation model, and computing the influence on the induced stress of a middle perforation cluster fracture elongated area by gaps among different perforation cluster fractures and fracture extended lengths; optimally selecting a shale reservoir horizontal well volume fracturing perforation cluster gap and perforation cluster extended lengths at the two ends, so as to promote a middle perforation cluster hydraulic fracturing fracture to be extended and interactively produce stretching, shearing and pass through failure modes with the natural fracture at the same time to form a complex fracture. According to the method, induced stress field produced through the extension of the hydraulic fracture, perforation gaps within the same fracturing section and the extended fracture lengths are organically combined, and the horizontal well volume fracturing technology is properly perfected.

Description

technical field [0001] The invention belongs to the technical field of mineral resources, and in particular relates to an alternate volume fracturing method for horizontal wells in experimental shale reservoirs. Background technique [0002] Shale reservoirs are characterized by low porosity, low permeability, and natural fractures. A large-scale complex fracture network zone is formed through volume fracturing, providing sufficient channels for shale gas flow, and economically recoverable production and recovery can be obtained. Currently, there are two main techniques for volume fracturing of horizontal wells in shale reservoirs: [0003] (1) Simultaneous fracturing technology: implement synchronous segmental fracturing for two or more horizontal wells, and use the induced stress interference of hydraulic fractures formed by fracturing between different horizontal wells to increase the fracture density and degree in the area between the fracturing horizontal wellbores, M...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 曾凡辉程小昭郭建春陶亮唐波涛
Owner SOUTHWEST PETROLEUM UNIV
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