System and method for measuring fracture type interface interlayer fluid channeling characteristics

Abstract

The invention discloses a system for measuring fracture type interface interlayer fluid channeling characteristics, and the system comprises an interlayer fluid channeling simulation device which is used for simulating the interlayer fluid channeling process of a fracture type interface between sandstone and coal rock; the data monitoring device is used for respectively monitoring the flow of the gas injection end and the outlet end of the sandstone sample and respectively monitoring the flow of the gas injection end and the outlet end of the coal rock sample; and the data processing device is used for implementing an interlayer fluid channeling experiment under the combined conditions of different coal rock layer pressure set values and different sandstone layer pressure set values, obtaining corresponding sandstone gas injection and gas production flows and coal rock gas injection and gas production flows, and on the basis, obtaining interface resistance coefficients of the fractured interface. According to the method, quantitative measurement of the interlaminar fluid channeling quantity and the fluid channeling resistance coefficient under different ground stress and fracture conditions is achieved, and the fluid channeling quantity between the coal seam and the sandstone layer in the multi-layer commingling production process can be accurately represented.

Description

technical field [0001] The invention relates to the technical field of oil and gas development, in particular to a system and method for measuring the channeling characteristics of cracked interface layers between coal rocks and sandstones. Background technique [0002] Coal seams in the eastern Yunnan-western Guizhou region of my country have the characteristics of many layers, small single-layer thickness, and gas-bearing sandstone interlayers between coal seams. The Horseshoe Valley Basin in Canada and the Powder River Basin in the United States also have similar coalbed methane blocks. For multi-coalbed methane reservoirs with relatively small single-layer thickness, it is necessary to drill a gas well that penetrates multiple coal seams and sandstone gas-bearing layers, and develop them by combined layer fracturing and joint drainage to achieve economical and efficient development of coalbed methane. Target. In the process of combined fracturing, a complex fracture net...

AI Technical Summary

Problems solved by technology

Since the existing experimental devices for measuring interlayer channeling are mainly aimed at conventional multi-layer oil and gas reservoirs, and use multiple cylindrical cores in parallel for simulation, this physical simulation method can only qualitatively study the channeling between multiple oil and gas layers. flow conditions, and cannot accurately measure the fluid migration between multiple oil and gas layers

In addition, the interlayer interface between coal rock and sandstone is divided into fusion interface, fracture interface and transition interface. The conventional interlayer channeling device is feasible for the measurement of channeling flow at the fusion interface, but for the interlayer interface of fracture interface Difficulty measuring channeling

Images