Internal diversion fracturing temporary plugging agent dosage design method based on shale geology-engineering parameters

Abstract

The invention discloses an internal diversion fracturing temporary plugging agent dosage design method based on shale geology-engineering parameters, which comprises the following steps of: firstly, accurately measuring critical temporary plugging pressure under the conditions of different crack widths, different temporary plugging agent types and different temporary plugging agent dosages; according to shale stratum rock mechanical parameters and fracturing engineering parameters, calculating the hydraulic fracture opening change condition, and calculating the critical turning pressure in the fracture; and determining the dosage of the diversion fracturing temporary plugging agent in the shale gas horizontal well crack by combining a theoretical calculation result and experimental test data. The invention provides a method for measuring the critical temporary plugging pressure of different types of temporary plugging agents in fractures with different widths, and through the calculation of the hydraulic fracture width and the critical diversion pressure in the fracture, the reasonable dosage of the temporary plugging agent injected into the shale gas horizontal well fracture during diversion fracturing is determined, fracture diversion is achieved, the complexity of a fracture network is improved, and the situation that the wellhead pressure is too high is avoided; and the construction safety is guaranteed, and reliable guidance is provided for on-site fracturing construction.

Description

technical field [0001] The invention relates to a method for designing the dosage of temporary plugging agent for internal diversion fracturing based on shale geological-engineering parameters. Background technique [0002] Shale reservoirs have the characteristics of low porosity and ultra-low permeability, and the permeability is only Nadarcy level, which is extremely unfavorable for oil and gas migration. A large amount of experience in shale gas exploration and development shows that due to its own brittleness, shale formations usually develop a large number of natural fractures, which need to be fractured through horizontal well fracture networks to activate natural fractures and interweave them while extending hydraulic fractures A complex fracture network is formed, which significantly increases the apparent permeability of the reservoir, greatly increases the production of shale gas wells, and realizes stimulation and stimulation. [0003] Diverting fracturing in sh...

AI Technical Summary

Problems solved by technology

[0004] There are various types of temporary plugging agents injected in the shale gas horizontal fracture diversion fracturing process, with different costs and different plugging effects, and the amount of temporary plugging agents lacks a scientific and systematic design method

In addition, at present, only traditional proppant flowmeters are usually used to simulate the temporary plugging of fractures under different closure stresses in formations. However, in the actual fracturing process, underground fractures are not closed, there is no closure stress on the wall, and the fractures have a certain width.

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