Monitoring Technology for Co-Mingled Tight Play Development with Hydraulic Fractures

Abstract

At present, low-permeability formations become increasingly important in global hydrocarbon production. Simultaneous development of several reservoir zones with single well pattern - along with hydraulic fracturing became the most common for the today's upstream. At the same time, less attention has been paid so long-term monitoring of such comingled pay zone development with hydraulic fractures. Traditional monitoring methods offer minor benefits in such conditions. Based on theoretical considerations and numerical modeling of velocity, pressure, and temperature fields in tight formations tapped by hydrofracs (Eclipse 300), the authors proposed a new production monitoring technology. This technology is based on comprehensive production logging and well testing methods and involves the following innovations: It was found that in case of hydraulically fractured pay-zone the fracture will affect spinner logging showing homogeneous flow (injection) profile even in heterogeneous formation. Analysis of transient temperature survey in the assumption of linear geometry of temperature field is proposed as an alternative method.The authors assessed existing capabilities of long-term monitoring of downhole pressure and flow rates under conditions of comingled fractured tight reservoirs development, with individual zone real-time estimation of formation pressure, permeability, and skin factor. To avoid uncertainties of these parameters, the authors justified, in addition to this monitoring technology, the alternating well off take and shutdown cycles.A new methodology for estimation of permeability and skin-factor of individual layers (including the hydrofrac-related ones) based on well monitoring data using permanent downhole monitoring systems.The authors justify a comprehensive approach to tight reservoir development monitoring with hydraulic fractures, based on continuous acquisition, storage, and analysis of long-term, multifaceted survey which is critical for numerical modeling information support.

New Way of Individual Evaluation of Tight Comingled Reservoirs

“…The algorithms for the solution were described by the authors earlier in [9,10]. The algorithms for the solution were described by the authors earlier in [9,10].…”

New Way of Individual Evaluation of Tight Comingled Reservoirs (Russian)

“…Алгоритм решения этой задачи был ранее описан авторами в работе [9]. Алгоритм решения этой задачи был ранее описан авторами в работе [9].…”