Water Injection Effect Evaluation and Optimization Practice for a Giant Carbonate Reservoir in Middle East

Abstract

Water injection evaluation and water injection optimization practice of a giant carbonate reservoir in Middle East was discussed. In view of water injection development contradictions and challenges faced by target oilfield, such as low pressure maintenance, low water injection efficiency resulting from water channeling along High Permeability Layers (HPLs) in comingled development mode, low formation energy recovery rate, and water source shortage in Middle East, based on surveillance data such as rich Production/Injection Logging Testing (PLT/ILT) data, integrating several advanced waterflooding management tools including Capacitance Resistance Models (CRM), reservoir engineering analytical methods, streamline simulation, an optimization method and workflow for optimizing commingled waterflooding management was proposed. Firstly, injection-production dynamic characteristics and modes of the HPLs was comprehensively identified and the impact of injected water channeling caused by HPLs was reasonably evaluated; Secondly, real-time splitting commingled injection-production data was implemented based on PLT/ILT profiles and equivalent flow resistance method at different time, and then CRM was used to calculate the layered allocation coefficient of every well pairs, quantify the injection-production relationship, cross-validated by streamline distribution and allocation coefficients calculated by a GPU-level parallel high-efficiency reservoir simulator; Finally, water injection efficiency was optimized based on balanced water injection concept, then specific injection-production optimization countermeasures based on optimized water injection efficiency were proposed, and field examples were presented to verify the results. The new presented method and workflow is effective to optimize the injection-production for commingled vertical wells, getting higher oil production with less water production and water injection, which will not only increase water injection efficiency by 10% and oil recovery by 2%, accelerate recovery rate of formation energy by 80 psi per year under lack of water source, and improve the workover effect of shut-in wells production restoration, but also remarkably improve economic revenue, and can be an effective technology to develop oilfields efficiently and economically.

Copyright 2022, IFEDC Organizing Committee

This paper was prepared for presentation at the 2022 International Field Exploration and Development Conference in **’an, China, 16–18 November 2022.

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