Automated Surveillance and Diagnostic Workflow for the Management of Water Production in Naturally-Fractured Carbonate Reservoirs

Abstract

This paper presents a new automated workflow to diagnose and evaluate water production signatures for a mix of vertical and lateral wells in a carbonate reservoir under water-flooding. The workflow can be used for rate optimization, remedial intervention planning and for reservoir description. The workflow basically includes decline curve analyses for oil and water productions, Chan analysis for water production signature, and evaluation of the combined decline curves and water signatures for estimating well ultimate cumulative oil and reservoir description. This enables reservoir engineers in optimizing the production rate and in planning future remedial actions to prolong well life and maximize recovery. A new event-based Chan analysis is proposed to better assess the change in water production signature after each remedial event such as acid treatment, water shut-off or sidetracking. The study reveals that the benefits of the automated workflow are significant for reservoir engineers who deal with complex reservoirs with numerous wells. The well ultimate cumulative oil is estimated more accurately using the combined decline curves of oil and water production. Using the proposed event-based Chan analysis, it is possible to identify the change in water production signatures of wells of different types before and after well events. The water problem diagnostics are also helpful to understand the highly-conductive features in complex carbonate reservoirs.

Diagnosing High Water Production in Kalama Field, Niger Delta

“…For example Al-Otaibi et al [10] scrutinized the Chan's diagnostic plots with production logs (PLT) and pressure transient analysis (PTA) to gain better insight into water entry through fractures in carbonate reservoirs. Cinar et al [11] developed an automated workflow to diagnose and evaluate water production signatures for a mix of vertical and lateral wells in carbonate reservoirs under waterflooding for rate optimization, remedial intervention planning and reservoir description. This work investigates the possible causes and solutions to the high water cut production problems in oil wells using Kalama field in Niger Delta as a case study.…”

Evaluation of obsessive compulsive disorder and depression symptoms in visitors of hair and skin clinic of Shohadaye Ashayer Hospital of Khorramabad

“…This phenomenon is more complicated in fractured reservoirs, where dual porosity exists, which results in the formation of two cones. In this case, two different cones with two different rates, one in matrix and one in fracture may form, which creates a very complicated situation at the surface (Egbe and Appah, 2005;Lakatos et al, 2014;Mohammed et al, 2014;Cinar et al, 2016;Li et al, 2016;Zemtsov and Lytkin, 2016). Permadi and Jayadi (2010) proposed a new calculation method for determining the water coning in horizontal wells.…”