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Wellbore Gas Testing
The salt cavern gas storage wellbore and cavern seal testing technology covers the full lifecycle in stages. Using nitrogen with a concentration not lower than the industrial standard as the medium, a pressure 1.1 times the maximum operating pressure of the gas storage facility is applied at the production casing shoe. By injecting nitrogen to lower the gas–water interface to 5–10 m below the casing shoe and maintaining constant pressure, the depth of the gas–water interface, wellhead pressure, and other parameters are continuously recorded. The leakage rate curve is calculated, and sealing performance is evaluated based on leakage rate trends and gas–water interface changes. The process strictly follows the SY/T 7644-2021 standard, providing scientific and precise assurance of gas storage seal integrity.

Application Scope

Pre-cavern leaching: testing of production casing and open-hole sections
Post-cavern leaching: testing of wellbore and cavern
Post injection/withdrawal well completion: testing of wellhead, injection/production string, and cavern

Technical Features

  • Covers all stages before and after cavern leaching and after injection/withdrawal completion, with targeted testing of different components’ sealing performance
  • Uses industrial-grade nitrogen as the testing medium, safe, inert, and residue-free, meeting environmental requirements
  • Tests at 1.1 times the maximum operating pressure to simulate extreme working conditions and expose potential leakage risks in advance
  • Quantitative analysis based on both leakage rate trends and gas–water interface changes to scientifically evaluate sealing performance, ensuring reliable results

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