Water-control gas recovery technology based on beneficial resumption of production:A case study of Jia 2 Member gas reservoir in Moxi gas field,central Sichuan Basin
After being shut in due to low/no benefit,high water-producing gas wells recover a relatively high level in wellhead pres-sure,posing a significant well control safety risk.Resuming production for such wells by using conventional development modes may suffer some problems such as the high cost of formation water treatment and the difficulties in management on unattended production.To safely and beneficially resume production of gas reservoirs targeting the second member of the Lower Triassic Jialingjiang Forma-tion(Jia 2 Member)in the Moxi gas field,this paper proposes a water-control gas recovery technology for the resumption of gas wells with high pressure,high water production,and low/negative benefit,on the basis of considering the factors of reservoir production management,safety and environmental protection,and economic benefits.The relationship between dynamic data,such as tubing pressure and output,under the conditions of different water production,gas production,production times,and intermittent production cycle was identified by conducting field tests on water-control gas recovery,in order to determine the rational production pressure dif-ference,water production capacity and intermittent production cycle.Meanwhile,a well opening/shut-in system was determined based on comprehensive factors including the production organization and management.The effectiveness of water-control gas recovery technology was further improved by configuring an intelligent intermittent production system.The results show that,(ⅰ)the proposed technology ensures the successful resumption of shut-in wells and effectively reduces well-control safety risks;(ⅱ)the well selection criteria and process parameter calculation method have been verified by field tests and applications;and(ⅲ)the intelligent intermit-tent production system enhances the performance of the technology in field application.The proposed technology provides a powerful support for resumption of production of shut-in wells,control over high-pressure wells,fine production management,and enhanced gas recovery.It is worthy of promotion to similar gas reservoirs.
Moxi gas fieldHigh water-producing wellWater-control gas recoveryResumption of production for shut-in wellwell with low/negative benefitBeneficial development
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