Successful Appraisal of Maximum Reservoir Contact Well in an Undeveloped Reservoir Through Well Construction and Integrated Fit for Purpose Engineering & Technology

Abstract

Undeveloped reservoirs poses many uncertainties in terms of reservoir structural control and inherent properties and as a result integrated fit for purpose engineering and technology plays a vital role to drill, appraise and complete a well successfully. While Maximum Reservoir Contact (MRC) wells show promise in increased deliverability, sustainability and cumulative recovery, the risk of high cost, reduced well life and sustainability issues can become real if the well is not planned, executed and appraised properly. This paper focuses on the integrated multi-disciplinary approach between Reservoir Engineering, Petroleum Engineering, Drilling and Geoscience functions to achieve MRC of 8,500 ft. in two sublayers of 3 ft. each while mapping and avoiding any potential risk for water zones. Data acquisition pertaining to reservoir characterization, fracture and fault identification was planned to enhance this undeveloped reservoir understanding and to optimize lower completion design. 3D real-time multiwell reservoir modelling and updating capabilities with appropriate LWD measurements for Proactive Geosteering and Formation Evaluation was planned. Based on forward response model from offset well data along with drilling engineering and data acquisition requirements, an LWD suite consisting of RSS, Gamma Ray Image, High Resolution Resistivity Image (Fracture and Fault identification), NMR (both Total and Partial Porosities, and T2 Distribution) along with a Deep Azimuthal Resistivity measurement for early detection and avoidance of conductive/water zones was utilized. Achieved a field record of the longest drain drilled with 8,500 ft. of MRC. The fit for purpose real time LWD measurements enabled successful placement of the lower completion and blanking the risk zones for pro-longed sustainable production. Identification of fracture zones in real time helped in optimizing the completion plan while drilling. Based on this well's results, it is established that replicating the same practice could positively affect the overall Field Development potential. The same technique is planned for the future development of undeveloped reservoirs in this field.