Research and application of old well evaluation technology in underground gas storage

Abstract

Gas storage has high requirements for new drilling well structure, cementing quality and wellbore quality. In order to ensure the sealing of the wellbore, cement is returned to the surface and special casing is used to ensure the sealing of the wellbore. Production Wells of crude oil reservoirs generally cannot meet these conditions for the gas storage converted from depleted oil and gas reservoirs. Therefore, production Wells will not be used in principle after the reconstruction of the gas storage. In order to improve the comprehensive economic benefit and reduce the construction cost, these production Wells are generally used as monitoring Wells, observation Wells and gas production Wells after quality review and evaluation. This paper introduces the research and application of quality review, detection technology and evaluation technology of old Wells in underground gas storage.