PETROPHYSICAL SURVEILLANCE - THE KEY DRIVER IN OPTIMISING WELLS PERFORMANCE

摘要

Reservoir quality and completion efficiency are key factors that impact well performance. The relationship becomes more complex for the case of Cased Hole Gravel-Pack and Frac-Pack completions.Most of the time, completion quality and reservoir description were treated in isolation, by different disciplines deploying dissimilar surveillance methods. This can negatively impact the decision making and the cost of data acquisition. Evolution of Multi-Detector Pulsed Neutron (MDPN) technology and the improvement of nuclear attributes extraction (spectral processing) enables us to simplify the data acquisition program while expanding the applications to both reservoir and completion evaluation.Our paper will describe two case studies from the Gulf of Mexico where deployment of Multi-Detector Pulsed Neutron technology saved significant rig time and reduced the production deferment.In this case study, various nuclear attributes were used to extract information about connate water distribution, something that has been observed to be variable in the field. This will reduce the uncertainty in MDPN derived Saturation and impact further the reservoir model when reconciled with other data e.g. Production log (PL).Data acquired with the same MDPN instrumentation has been used to evaluate the quality of the ceramic proppant packing these wells. This approach introduces rigor in acquisition, processing and evaluation, offering a robust answer over traditional methods such as density based and radioactive tracer logs.The development of memory conveyance broadens the application of MDPN for reservoir and completion evaluation.