Publications

The evolution of SKW-22STst from an oil production well to an injection well for a CO2 huff and puff project was pivotal in boosting oil production. However, the 2021 USIT evaluation pinpointed significant concerns regarding cement bond integrity, particularly in specified zones, necessitating remedial action. To address this challenge, a cutting-edge solution was deployed: the implementation of a dual cement slurry system. This system comprised two distinct yet synergistic cement slurries—lead and tail.

The lead cement slurry, engineered with higher fluid loss, served a strategic purpose as a bridging agent. By employing larger particles or fibers within its composition, this slurry acted to fill voids and imperfections in the cement matrix, enhancing overall stability. In contrast, the tail cement slurry, designed with a fluid loss below 50 cc/30 min, assumed the primary role of fortifying cement integrity. Its formulation, engineered for optimal bonding capabilities, featured additives that improved adhesion to the casing and formation walls. This slurry played a pivotal role in ensuring a resilient and durable cement barrier.

The deployment strategy employed the bullhead method, an innovative approach enabling simultaneous cement squeezing and pumping. Notably, this method eliminated the need for downhole packers, streamlining the operation and significantly enhancing operational efficiency. Integration of these tailored cement slurries and the strategic pumping technique led to remarkable outcomes. The post-intervention Cement Bond Log (CBL) results demonstrated substantial improvements, underscoring the effectiveness of the dual slurry system. Subsequent production tests revealed a marked increase in oil production—a testament to the success of the comprehensive approach adopted for cementing and well performance optimization in SKW-22ST.

The outcome of this meticulous intervention workflow manifests in notable improvements evidenced by enhanced CBL results. Subsequent production tests yielded a commendable output of 850 BOPD. This success not only underscores the efficacy of the dual slurry system but also highlights its instrumental role in optimizing both cement integrity and production yield.