Deconvolution-based formation pressure without well shut-ins

Introduction. To date, for almost all oil and gas producing companies, the issue of maintaining production from the current wells is relevant. Understanding both the current reservoir pressure and its distribution across the development targets, as well as the dynamics of reservoir pressure in the past, is one of the most important sources of information when analyzing field development to identify opportunities for maintaining production. At the same time, the standard approach to determining reservoir pressure requires shutting in wells, which leads to production deferment.

Aim. To improve the efficiency of field development and clarify information on current reservoir pressure, reservoir pressure calculations were performed using multiwell deconvolution, conducted based on the results of long-term monitoring of bottomhole pressure and flow rate of a group of wells during their production.

Materials and methods. The method for achieving this objective is to use a mathematical algorithm for multiwell deconvolution to quantitatively assess the impact of production of each well in the group on the bottomhole pressure in the central well. Once this relationship is established, it becomes possible to mathematically shut-in the central well and obtain its reservoir pressure without actually shutting it in.

Results. The technology was tested on a terrigenous field with a gas cap, produced by horizontal wells. Based on long-term bottomhole pressure monitoring, multiwell deconvolution was performed, reservoir pressure was calculated, and its prediction was made. Based on subsequent monitoring, reservoir pressure was recalculated, and the discrepancy between the predicted and actual values was just a bit over 1 %. Additionally, the reservoir and near-wellbore zone properties, drainage area size, and cross-well pressure interference were assessed.

Conclusion. The obtained results confirm that the authors' approach can serve as a solod basis for reservoir pressure monitoring in conditions where studies required by standard approaches becomes almost impossible due to production deferment, such as in case of horizontal wells, producing from low-permeability formations.

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