Focused Fracture Jetting for Tight Carbonate Reservoirs

Abstract

Abstract This paper provides an overview of the trial implementation of Focused fracture jetting, a solution aimed at effectively stimulating long horizontal open-hole wells in the oil and gas industry. The goal of this method is to create multiple fractures that penetrate deeper into the reservoir, increasing the overall stimulated surface area. Previous techniques, such as HCl stimulations, delayed reaction acid, abrasive jetting, and fishbones, did not achieve the desired improvements in injectivity for microporous water injection and oil producer wells. As a result, alternative methods were explored, leading to the adoption of Focused fracture jetting. This methodology utilizes high velocity jetting and dynamic diversion to create controlled fractures etched with acid, providing permanent increases in effective wellbore area. This paper focuses on the trial implementation of Focused fracture jetting in two water injection wells and one oil producer, named as WI-1, WI-2 and OP#1. In WI#1, 25 stages were pumped over a 700m interval with 30m spacing between stages, while in WI#2, 20 stages were pumped over a shorter interval of approximately 500m with 25m spacing between stages and OP#1, 11 stages were pumped over a shorter interval of approximately 680m with 29m spacing between stages. The stimulation was successful in improving water injection rates, resulting in a significant increase in the initial rate and approximately doubling the stable injection rate as well as production was enhanced drastically from the oil producer OP#1. The deployment of Focused fracture jetting has the potential to unlock the microporous reservoir's development, particularly in tight reservoirs with long open-hole sections, offering competitive costs and sustainable results.