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Oil and gas reservoir fracturing sand adding method

A technology for oil and gas reservoirs and fracturing, which is applied in the field of fracturing and sanding, which can solve the problems of insufficient proppant filling and low proppant effective support ratio, and achieve the effects of improving transportation efficiency, filling degree and flow conductivity

Active Publication Date: 2019-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems of insufficient proppant filling and low proppant effective propping ratio in volume fracturing complex fractures, the present invention proposes a method of fracturing and adding sand to oil and gas reservoirs that can increase the filling degree of fractures

Method used

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Embodiment Construction

[0076] The present invention will be further described through specific examples below. However, it should be understood that the following examples are only used to further illustrate the present invention, but do not limit the present invention.

[0077] Well A is an evaluation vertical well located in a block of Sinopec. The fracturing interval of the target layer is 3375-3411m, 27.5m / 5 layers; the lithology of the target layer is lithic sandstone and feldspathic lithic sandstone, and the pores The density is 3.3%-14.3%, with an average of 7.2%, and the permeability is 0.017-3.56mD, with an average of 0.21mD. It is a low-porosity micro-throat tight gas reservoir; the gas reservoir pressure coefficient is 0.85-1.02, and the geothermal gradient is 3.4-3.5℃ / 100m, it belongs to normal temperature and pressure gas reservoir.

[0078] According to the interpretation of the stress profile, the minimum principal stress value of the target layer in this well is 58.4MPa~59.7Mpa; th...

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Abstract

The invention provides an oil and gas reservoir fracturing sand adding method, which comprises a fracturing crack forming stage and a sand adding stage. A multi-scale complex crack system is formed inthe fracturing crack forming stage, fracturing fluid with different viscosities and propping agents with different particle sizes are injected in the sand adding stage to adapt to the multi-scale crack system, and the crack system is filled and supported from far to near. According to the method provided by the invention, by optimizing and adjusting the construction parameters and adjusting and controlling the accumulation height of the proppant in the fracture, the effective support of the proppant in the fracture height direction is improved, the filling degree of a multi-scale complex fracture system is improved, the volume fracturing complex fracture sand adding technology is perfected and improved, and finally, the effects of increasing the yield after pressing and stabilizing the yield are improved.

Description

technical field [0001] The invention relates to the technical field of hydraulic fracturing stimulation of oil and gas reservoirs, in particular to a fracturing sand adding method suitable for increasing the filling degree of proppant in fractures during fracturing. Background technique [0002] Volume fracturing technology is one of the core technologies for the commercial development of unconventional oil and gas resources such as shale gas and tight gas. Enlarging the volume of fracturing stimulation and increasing the complexity of fractures are the goals pursued by volume fracturing technology. At present, in the fracturing of this type of reservoir, due to improper selection of fracturing fluid and proppant, insufficient optimization of fracturing construction parameters, and unreasonable sand addition methods during fracturing, there are still problems in fracturing such as poor fracture profile and poor proppant in fracture. The filling degree is low, and it is diffi...

Claims

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Application Information

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IPC IPC(8): E21B43/267E21B43/26
Inventor 蒋廷学刘建坤吴峙颖侯磊周林波左罗
Owner CHINA PETROLEUM & CHEM CORP
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