Method for determining shale reservoir siltstone adjacent layer plugging thickness based on pressure field simulation

The lower limit of the top and bottom plate sealing thickness of the shale reservoir is quantified by pressure field simulation method, which solves the problem of the lack of effective evaluation of the sealing performance of shale reservoirs in the existing technology, improves the economic benefits of in-situ exploitation of shale oil and gas, and expands the scope of lithologic identification of the cover layer.

CN119715987AActive Publication Date: 2025-03-28CHINA NAT PETROLEUM CORP
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Patent Information

Application Number
CN202311255024.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-26
Publication Date
2025-03-28
Estimated Expiration
2043-09-26

AI Technical Summary

Technical Problem

The existing technology lacks effective means to evaluate the roof sealing performance during in-situ mining of shale reservoirs, which affects the recovery rate.

Method used

Through the pressure field simulation method, the top slate samples of the shale reservoir are pressurized by using a pressurization device and a pressure sensor until the pressure is stable, and the lower limit of the top slab sealing thickness is determined, and the lower limit of the bottom slab sealing thickness is considered if necessary.

Benefits of technology

The specific quantification of the lower limit of the sealing thickness of the top and bottom plates of shale reservoirs has been achieved, effectively guided production, improved the economic benefits of in-situ mining of shale oil and gas, and expanded the scope of lithology identification of the cover layer, including siltstone as an effective sealing layer.

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Abstract

The invention discloses a method for determining shale reservoir siltstone adjacent layer plugging thickness based on pressure field simulation, which comprises the following steps if the fracture pressure of a shale reservoir is judged to be smaller than the minimum starting pressure of an overlying silty rock stratum: preparing a roof rock sample by using an overlying silty rock stratum coring section, wrapping the roof rock sample by using a sealing material, and performing pressure field simulation to obtain the shale reservoir silty sandstone adjacent layer plugging thickness. Arranging a pressurizing device and pressure sensors on the bottom surface of the rock sample, and arranging a plurality of pressure sensors on the side surface of the roof rock sample at set intervals; pressurizing the roof rock sample by using a pressurizing device until the bottom is set pressure, stabilizing the pressure until the variation amplitude of the measured value of each pressure sensor is smaller than a set threshold value, and determining the lowest position where the pressure of the roof rock sample is not higher than second set pressure according to the measured values of the pressure sensors; determining the lower limit of top plate plugging thickness according to the distance from the position to the bottom surface; and similarly, determining the bottom plate plugging thickness lower limit. The method can reasonably quantify the lower limit of the plugging thickness of the top and bottom plates of the shale reservoir through a pressure field simulation method.
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