Coalbed methane staged fracturing horizontal well productivity simulation test device and method

Abstract

The invention discloses a coalbed methane staged fracturing horizontal well productivity simulation test device. The device comprises a bearing platform, a power loading mechanism, a coal reservoir simulation mechanism, a gas recovery mechanism and a data acquisition device; the bearing platform comprises a bearing frame, a working platform and a control console; the coal reservoir simulation mechanism is connected with the working platform; and the power loading mechanism, the gas recovery mechanism and the data acquisition device are all connected with the bearing frame, and are connected with the coal reservoir simulation mechanism. The specific test method comprises four steps: equipment assembly, equipment prefabrication, simulation and data collection. The device and the method can effectively simulate different geological structures, thereby effectively realizing the test accuracy of accurately measuring the gas production after fracturing operation, and at the same time effectively improving the working efficiency of the detection test operation, providing the relatively actual reference basis for productivity prediction under similar coal reservoir conditions, and effectively improving the accuracy and reliability of coalbed methane mining area design, mining technology and mining activities.

Description

technical field [0001] The invention relates to a device and method for simulating and testing the production capacity of a coalbed methane staged fracturing horizontal well, which belongs to the coalbed methane mining technology. Background technique [0002] Vertical wells and horizontal wells are the two main well types for the development of coalbed methane on the ground in my country. Horizontal wells have the characteristics of large pressure relief area, high gas production rate, shortened gas production time, and relatively mature technology. This feature determines that it will be more and more widely used in areas with a high degree of coalbed methane exploration and development. However, the permeability of coal reservoirs in my country is generally low, and the coalbed methane multi-branch horizontal well technology has been well promoted in areas where coal seams are buried shallower than 600 meters and the permeability of coal reservoirs is higher than 0.5mD. a...

AI Technical Summary

Problems solved by technology

However, the geological conditions of coal reservoirs in the United States, Australia and other countries are quite different from those in my country. Reservoir permeability is an important parameter affecting the productivity of coalbed methane wells, while the permeability of coal reservoirs in countries such as the United States and Australia is generally A few millidarcies or even hundreds of millidarcies, while the permeability of coal reservoirs in my country is generally less than 1 millidarcy, and there are significant differences in magnitude. As a result, when Chinese coalbed methane scientists and technicians use these software, they are more based on the historical gas production on site. The production dynamic fitting of the data and the adjustment of the parameters to predict the production capacity are highly subjective and cannot accurately reflect the objective facts

Some researchers predict the productivity of coalbed methane wells by building mathematical models of productivity. Differences in the number of fracturing stages and the heterogeneity of coal reservoirs may lead to some discrepancies between the predicted results and the actual ones.

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