Method for measuring sediment porosity of salt cavern gas storage connected well

Abstract

The application discloses a method for measuring the sediment porosity of a salt cavern gas storage in a communication well, the communication well comprising a first salt cavity at a relatively low position and a second salt cavity at a relatively high position, and the method comprises the following steps: step S1: injecting gas into the first salt cavity and the second salt cavity, controlling the gas-water interface of the first salt cavity to be located in the net cavity space thereof, controlling the gas-water interface of the second salt cavity to enter the sediment section thereof, and controlling by gas injection, the application utilizes the natural condition of the inherent natural height difference of the high-low position salt cavities, converts the salt cavity height difference into a pressure difference between the two cavities by differential gas injection control, takes the pressure difference as the driving force for the spontaneous flow of gas from the low-position salt cavity to the high-position salt cavity, realizes natural gas transfer and pressure balance, and calculates the sediment porosity based on the gas transfer amount and the gas-water interface change amount and other data, so that no additional special detection equipment needs to be invested, and the early-stage investment and later-stage operation and maintenance cost of the sediment porosity measurement are greatly reduced.

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