Potential Tapping Technology and Prospect for Shut-down Gas Wells in Changqing Gas Area
The Changqing gas area has abundant natural gas resources and all natural gas fields are low-permea-bility tight gas fields,dominated by tight gas.With the gas field development,there are practical problems such as large inventory,wide distribution and difficulty in resuming production of shut-down wells and low production wells in gas areas,which pose daunting challenges to the long-term benefits and stable production of gas areas.The article has continuously carried out the practice and application evaluation of shut down well tapping potential technology in Changqing gas area,combined with the dynamic and static characteristics of gas wells,analyzed the causes and technical difficulties of gas well shutdown,optimized the type of potential tapping measures,opti-mized process parameters and strengthened effect evaluation.It has initially formed three major evaluations and potential tapping technology series,namely"reservoir potential tapping,wellbore treatment,and ground support facilities",these measure have been applied in 1,497 wells,with a cumulative gas increase of over 5 billion cu-bic meters and significant results.With the continuous promotion of natural gas exploration and development in the Changqing gas area,the characteristics of gas reservoirs such as deep burial,thin reservoir,low single well production and high water to gas ratio have become more prominent.It is also necessary to further carry out tech-nical research such as tapping the remaining reserves of the old layer,utilizing interlayer reserves,handling com-plex wellbore operations,quickly resuming production of shut-down wells due to fluid accumulation,comprehen-sively treating,and the supporting of surface process technology,so as to achieve continuous iteration and upgra-ding of key technologies in gas field well tapping potential and better support the stable production and long-term development goals of the Changqing gas area.The establishment of the technology system for tapping potential and increasing production in the old wells of Changqing gas field has helped to increase storage and production in Changqing gas area,providing good reference and reference for the stable domestic strategic atmospheric status and long-term development of Changqing gas area.
Changqing gas areatight gas reservoirshut-down gas wellspotential tapping measuresstable production technology
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