Innovation and practice of key technologies for the efficient development of the supergiant Anyue Gas Field

Abstract

In recent years, the Sichuan Basin has been the most potential hydrocarbon-bearing basin in China thanks to the great exploration and development breakthroughs of deep large integral carbonate gas reservoirs and shale gas in this basin. The Anyue Gas Field located in central Sichuan Basin is not only the largest carbonate gas reservoir, but the most important supergiant gas field discovered in China in recent years. However, it faces a series of major difficulties, e.g., low reservoir porosity, low permeability, low gas well productivity, thin and vertically and laterally disperse gas layer, strong heterogeneity, quite low structural amplitude and complicated gas–water relationship, which bring great challenges to the rapid conversion of natural gas reserves to production. In this regard, technical researches have been carried out continuously. As a result, many key technologies have been innovatively integrated and great breakthroughs have been realized in many aspects. First, fine development technologies for supergiant, ancient and complex carbonate gas reservoirs are developed innovatively, “transparent gas reservoir” is constructed and the technologies for cultivating high-yield wells are established. By virtue of these technologies, all development wells in the gas reservoir of Lower Cambrian Longwangmiao Formation reach the target of high yield and the single-well gas production rate of the gas reservoir of Lower Sinian Dengying Formation is increased significantly, which provides support for the long-term high production and stable production of Anyue Gas Field. Second, good and fast construction technologies for large-scale gas fields are innovatively integrated. Based on this, the safety of gas wells is under control in the whole life cycle, quality engineering is built up efficiently within 3 years, green mining areas are forged and large-scale safe and clean gas fields are built up efficiently. Third, intelligent control technologies for the development of supergiant gas fields are innovatively integrated. By means of these technologies, internet of everything, depth perception and automatic production are realized. The intelligent technologies of new generation are fused, including AR, VR, robot and unmanned aerial vehicle (UAV). A new intelligent management mode for gas field development is set up, and an intelligent gas field is built up. Fourth, optimization technologies for the overall development of supergiant gas fields are innovatively development, so as to improve the development effects of strong-heterogeneity gas reservoirs and ensure the long-term stable production of supergiant water-bearing gas reservoirs. The research results can be used as reference for the efficient development of similar domestic and foreign gas fields.