Method for determining lower limit of plugging thickness of adjacent stratums of shale reservoir
Through the joint simulation of the temperature field, pressure field and stress field, the lower limit of the roof sealing thickness of the shale reservoir is quantified, which solves the problem of difficulty in evaluating the roof sealing performance in the prior art, and improves the recovery rate and economic benefits.
CN119715981AActive Publication Date: 2025-03-28CHINA NAT PETROLEUM CORP
10 Cites 0 Cited by
Patent Information
- Application Number
- CN202311249997.X
- 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 prior art is difficult to effectively evaluate the roof sealing performance during in-situ heating and mining of shale reservoirs, which affects the recovery rate.
Method used
Through the combined simulation of the temperature field, pressure field and stress field, the lower limit of the top plate sealing thickness of the shale reservoir is quantified by heating, pressurization and step by step stress application methods.
Benefits of technology
The specific quantification of the sealing conditions for the roof of the shale reservoir has been achieved, effectively guided production, and improved the economic benefits of in-situ heating and exploitation of shale oil and gas.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention discloses a method for determining the lower limit of the plugging thickness of adjacent stratums of a shale reservoir, which comprises the following steps of: wrapping the side surface of a roof rock sample by using a heat insulation sealing material, arranging heating, pressurizing and stress devices and sensors on the bottom surface, including temperature, pressure and strain sensors, and arranging a plurality of groups of sensors on the side surface according to a set interval; a heating device is used for heating the bottom of a rock sample to a first set temperature, a pressurizing device is used for pressurizing the bottom to a first set pressure, a stress device is used for applying stress to the bottom of the rock sample from small to large step by step to a first set stress, and the stress is stable until measured values of all sensors are stable; determining the lowest position where the rock sample temperature is not higher than second set temperature, the pressure is not higher than second set pressure and the strain is not higher than set strain according to the measured value of the sensor; determining a roof plugging thickness lower limit; 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 joint simulation of temperature, pressure and stress fields.
Need to check novelty before this filing date? Find Prior Art