Abstract
Gas mature fields are associated with challenges to optimize the hydrocarbon flow from reservoir to the sales point in a cost effective manner due to declining well productivity. Laslau Mare field is a mature gas field in Transylvanian basin (Mures County) developed in 1970s and is producing∼99% methane with low water-gas ratio. As any brown field, the state of depleted reservoir will generate several constraints for gas flow from formation to surface facilities and further to delivery point. During the exploitation has been observed that the operation conditions are facing with unstable pressure in the system due to low demand. Therefore, the back pressure effect will affect the wells in terms of inability to unload the bottomhole accumulated liquids and the reservoir will suffer a higher pressure drawdown. The best fit-for-purpose solution to overcome the above challenges is represented by installation of group compressor. Laslau Mare field has 3 group compressors running and shows positive results, especially when external pressure fluctuates continuously. This paper explain the challenges seen in 2016 in Laslau Mare field with back pressure effects and how the compression overcome them, and also other solutions that should be considered to optimize the well production.
Highlights
Gas fields from Transylvanian Basin have an advanced state of depletion considering the reservoir conditions after more than 50 years of exploitation and the intensive approach in terms of production
Gas fields operation was faced throughout 2016 with many challenges, field operation conditions changed in terms of dynamic surface parameters represented by field pressure and
Laslau Mare field, similar to others mature gas field from Transylvanian Basin, being a depleted reservoir is directly depended on external pressure from National Transport System and is having liquid loading problems
Summary
Gas fields from Transylvanian Basin have an advanced state of depletion considering the reservoir conditions after more than 50 years of exploitation and the intensive approach in terms of production. System nodal analysis uses single or multiple flow correlations and theoretical models developed for various components of reservoir, well completion and surface equipment systems to calculate the pressure loss associated with each component in the system This information is used to evaluate well performance under a wide conditions, which will lead to optimum single well completion and production practices, and to make the analysis of the effects of liquid loading on the gas wells. Due to lower demand for gas during warm season in Romania, the national grid pressure increased above expected or forecasted parameters, thereby an external pressure was recorded in the field This external pressure it was affected by turning off Filitelnic and Tigmandru Compressor Stations which are located at interference of production-transport. Running parameters for group compressors presented in table below were monitored in daily basis to maintain the optimum condition for compression and prevent any failure of equipment
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