Shale gas pressure-maintaining coring depressurization analysis metering device and shale gas content measuring method

Abstract

The invention relates to a shale gas pressure-maintaining coring depressurization analysis metering device and a shale gas content measuring method.The device comprises a gas leading-out pipeline, a gas flow metering part and a control and display part, an inlet of the gas leading-out pipeline can be communicated with a pressure-maintaining coring inner cylinder, and a pressure sensor and a pressure regulating part are connected to the gas leading-out pipeline in series; the gas flow metering part comprises a first metering branch and a second metering branch which are arranged in parallel, a wide-range gas flowmeter is arranged on the first metering branch, and a small-range gas flowmeter is arranged on the second metering branch; and the pressure sensor, the wide-range gas flowmeter and the small-range gas flowmeter are electrically connected with the control and display part. The shale gas pressure-maintaining coring depressurization analysis metering device can be directly connected with a pressure-maintaining coring inner cylinder, the gas content can be tested without opening the cylinder body, the lost gas amount does not need to be calculated, and the measurement result is accurate.

Description

technical field [0001] The invention relates to the technical field of geological exploration, in particular to a shale gas pressure-maintaining coring and pressure-reducing analytical metering device and a shale gas content measurement method. Background technique [0002] my country is rich in shale gas resources and has good prospects for exploration and development. Vigorously developing shale gas is of great significance to meet my country's sustained and rapid growth in energy demand. Shale gas is a typical unconventional natural gas, and its reservoir characteristics are quite different from those of conventional reservoirs. Mainly, the occurrence of shale gas can be divided into two states: adsorbed gas and free gas. However, natural gas in conventional reservoirs mainly occurs in free state. The determination of the total gas content of shale (adsorbed gas + free gas) is of great significance for shale gas reservoir evaluation and reserves calculation. The param...

AI Technical Summary

Problems solved by technology

But for the conventional coring technology, the gas (methane) will inevitably be lost in a large amount during the coring process, and the amount of this part of the gas (gas loss) cannot be tested

Especially for the deep shale gas reservoirs that are currently being vigorously developed, the coring time is longer, the pressure is higher, and the gas loss will be greater

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