Computer gestützte Methode zur Betriebsführung von gasgefüllten Porenspeichern inklusive der obertägigen Anlagen

PLE has developed and introduced an operational management model (» BFMPor « ) for porous rock storage facilities (aquifer storage facilities, depleted gas fields). The benefits of such a calculation programme provide operators with the following options: -Prediction of pressure development in a storage facility or storage horizons with respect to injection and withdrawal depending on the gas-in-place (GIP) - Prediction of pressure development at selected observation wells; - Prediction of the bottomhole and wellhead pressure of production wells, manifold pressure as well as station inlet/outlet pressure and compressor discharge/suction pressure for injection/withdrawal; - Consideration of all relevant threshold values for pressure, gas-in-place and rates; - Optimisation of storage operations on the basis of given optimisation targets; - Minimisation of gas overflow between storage horizons and avoidance of gas losses via the spill-point. Furthermore, with short calculation periods, the model is intended to be easy to operate and runs under Windows. A radial p/z model with water drive has been used for pressure-dynamic calculations of the storage horizons and permits prediction for the representative reservoir pressure as well as for the pressures of selected observation wells. If required, the model also takes into consideration gas overflow between the individual storage horizons, if existent, Further program modules are used to establish the dynamic wellhead and bottomhole pressure values of wells on the basis of the calculated reservoir pressure values. Performance diagrams are used for surface pressure losses in the gathering system and at the storage station. The station inlet/outlet pressure and compressor discharge/suction pressure constitute the calculation limits. A series of operational optimisation steps has also been implemented: - Prediction of performance for injection and withdrawal; - Minimisation of gas overflow/avoidance of gas losses; - Maximisation/minimisation of station outlet/inlet pressure; - Latest juncture for re-injection; - Minimisation of change in porous volume throughout a withdrawal/injection cycle. The applicability of a p/z model for porous rock storage facilities of different sizes (total volume between 60 and approx. 2,500 million m 3 V n , has already been verified and is described below by means of selected examples.