| Popis: |
The XON field is one of the five fields in the Gbaran-Ubie node to supply gas to Nigeria Liquified Natural Gas and is a field case history to illustrate the techniques and benefits of field development optimization right from initial field optimization to well delivery. The XON AB4000X reservoir is one of the largest Non Associated Gas reservoir in SPDC and is expected to provide more than half the gas required for Gbaran Central Processing Facility capacity of 1Bscf. Gas reserves from the 2003 Field review went down from 1.6 Tcf to 1.25 Tcf post the drilling of XON 7 and forecast based on new volumes indicate that the planned total reservoir offtake of 500 MMScf/d (100 MMScf/d per 5 gas producer planned for the reservoir) will only be sustained for 3 years instead of 5+ years. Following this, it became necessary to accurately estimate the Gas Initially In Place(GIIP), Ultimate Recovery (UR) and also provide an optimum development plan for this reservoir based on the new available data. An optimisation optimization team was put in place to build new static and dynamic models based on new available data to be used for: Accurately estimate in place volumes and UR Optimise expected reserves the Reservoir Development Plan Support drilling campaign The optimization optimization results have led to increase in expectation GIIP to 2.03 Tcf, represent a 22% increase over the 2003 Field Review and a 63% over the 2005 estimate. The CIIP increased to 106.0 MMstb, representing a 23% over the 2003 FR estimate. Total gas recovery has also increase to 1.26 Tcf which is about 20% from 2003 Field Review (FR). Production rates increased from 100 to 150 MMScf and compression scope of about 500 Bscf to further add value to the filed development. Most of the wells were delivered as top quartile wells due to collaboration between the asset, project and well engineering teams. |
