Integrated Production Modelling Of The Gidgealpa Satellite In The Northern Cooper Basin
Kong, Kian Han
Mohd Zainudin, Nik
Engineering Honours Degree, 2010
University of Adelaide
An integrated production model (IPM) was developed for the Greater Tindilpie (GT) area which is a part of the Gidgealpa satellite in the Northern Cooper Basin. IPM is the integration of reservoir, well and surface network models. A brief literature review has shown the popular use of IPM in the O&G industry, with a variety of software developed to achieve this. Applications of this tool include planning, surveillance, decision making and production optimisation.
In this project, a workflow was adopted to realise the work and effort necessary to develop the IPM, which was facilitated by the use of software from Petroleum Experts, in particular MBAL, PROSPER and GAP.
The integrated GAP model was revised and updated from an original model developed in 2007. A major change since then involved flowline changes to divert flow from some of the wells originally flowing to the Gidgealpa satellite to other satellites. Individual models were validated separately, and then as an integrated whole through history matching to existing well performance. This process formed a major part of the project to ensure the model was fit for prediction.
Six new development wells were planned to flow to the Gidgealpa satellite and were scheduled for 2011. The other major part of the project involved the use of the integrated GAP model to investigate the effects of these new wells on the satellite under different optimisation scenarios, in order to minimise backout. Backout is the loss or deferment of rate or production resulting from capacity constraints upon bringing new wells online (ConocoPhillips, 2010). Several effects were investigated involving the new development wells which were:
§ Delaying the well online schedule from the original
§ Staggering the time interval between bringing new wells on
§ The effect of each new well brought online on their own on the existing system
§ Bringing new wells online using a different ordering or arrangement of schedule
Results of the project have shown possible backout reduction through the delaying of the well schedule. The effect of staggering was unfavourable in terms of backout reduction with increasing stagger interval. However, the result was believed to be inconclusive due to a simulation resolution effect. The new wells were investigated individually to examine the effects on the satellite in more detail, where it was found several specific wells closest to the new wells and/or shared the same trunkline to the separator contributed to most of the backout. The new wells were brought online in an ordering from lowest to highest rate, and compared to the original ordering which resulted in an improvement.