Novel Production Enhancement Approach – Multi-Stage Acid Frac to Improve Gas Production and Maximize Reserve of the Tight Dolomite Layers in the Bahrain Field

Abstract The primary objective of this comprehensive study is to present the detailed process and highly successful outcomes of the first hydraulic fracturing (frac) job carried out in one of the gas reservoirs in Awali Field. This endeavor is specifically aimed at evaluating the untapped potential of the tight intervals that lie within the four distinct layers of the subject reservoir. These tight layers have previously been overlooked in conventional completion strategies. By concentrating on these underdeveloped zones, the study aspires to reveal and illustrate the significant production capacity that has remained unexploited. Through this innovative approach, the study aims to provide a replicable framework that can enhance overall gas production and resource utilization in similar The traditional completion strategy involves drilling and completing of wells by perforating the four high permeability reservoir layers. This is followed by an acid wash of the perforation intervals and producing the well as a commingled single completion. In order to evaluate the latent potential of the tight layers, a new seven-inch well was drilled, and a multi-stage acid fracturing (frac) technique was carried out, specifically targeting selected tight intervals within the four high permeability layers. Besides testing each layer individually, surveillance data such as production logs and pressure buildup data are gathered to evaluate the performance of each layer. Subsequently, a commingled completion was installed to assess the combined productivity of these tight intervals. Use of multi-stage acid frac targeting the tight intervals in the new well, showed exceptionally promising results. Each of the four distinct layers exhibited high productivity rates when tested separately. Production logging data indicated higher inflow contribution from two tight layers. In addition to higher productivity of tight intervals, pressure buildup results show pressures higher than average field pressure suggesting additional untapped gas potential. Production decline rate is also lower than the wells with normal completion well signifying additional reserves. The results of this study indicate that this innovative approach effectively harnesses the potential of previously overlooked tight layers en route to maximizing productivity and recoverable reserves. The introduction of a multi-stage acid frac technique specifically targeting the tight intervals represents a novel and groundbreaking approach in the field of gas production. The successful demonstration of this technique provides a robust and replicable framework and highlights the potential for substantial enhancement in gas production not only from the subject reservoir but also from similar reservoirs thereby contributing to the overall gas resource management. The findings of this study underscore the importance of innovative approaches in the sustainable and efficient management of energy resources in the Bahrain Field.