Device and method for observing gas production law of shale core

Abstract

The invention discloses a device and method for observing the law of gas production of shale cores, comprising: a high-pressure visible container, the high-pressure visible container includes a cylinder body and an end cap threadedly connected with the cylinder body, the cylinder body is placed horizontally, and the cylinder body includes The inner wall and the outer wall, the outer wall is provided with a top slot, and the end cover is provided with a vent hole and a water hole; the camera device is installed above the high-pressure visible container, and the core condition is recorded through the top slot; the lighting device , the lighting device is set above the high-pressure visible container, and the light is injected from the slot on the top; at least two high-pressure piston containers, at least one of the two high-pressure piston containers is connected to the vent hole, and the high-pressure experimental gas is injected; one is passed through the water The holes are connected to inject high-pressure water; each high-pressure piston container is connected to a high-pressure pump. By adopting the device and method for observing the gas production law of shale cores provided by the invention, the storage and permeability performance of shale reservoirs and the heterogeneity of reservoir development can be compared and evaluated.

Description

technical field [0001] The invention belongs to the field of exploration and development of oil and gas fields, and more specifically relates to a device and method for observing gas production laws of shale cores. Background technique [0002] Shale gas is a typical unconventional natural gas, which is produced in reservoir rock series dominated by organic-rich shale with extremely low porosity and permeability. The formation and enrichment of shale gas are self-generated and self-storage, mainly free gas and adsorbed gas, and in-situ saturated and enriched in the micro-nano-scale pores-fractures and mineral particle surfaces of the shale-dominated reservoir rock series. [0003] Shale development is a typical feature of shale reservoirs. Shale is a horizontal bedding developed in shale, its thickness is less than 1cm, formed by sedimentary diagenesis, and the bedding represents a short discontinuity without sedimentation or a sudden change in sedimentation. Shale is the ...

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Problems solved by technology

[0009] The purpose of the present invention is to solve the problems that the current method of using cores to develop shale gas production rules has the problems of on-site gas loss, lack of comparison of data from different experimental pressures, and inability to evaluate the respective contributions of fractures and lamellae to gas production. The device and method for observing the gas production law of shale cores restores the gas-bearing properties of cores under indoor constant pressure conditions, and realizes the consistency of pressure and the comparability of experiments. The number and frequency of bubble points and their positions and lateral changes on the core, comparative evaluation of the reservoir and permeability of shale reservoirs and the heterogeneity of reservoir development, and ultimately used in shale gas exploration, development selection and Capacity evaluation

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