This paper focuses on the evaluation of novel diversion technology based on self-degradable solids particulates that were applied in the complex carbonate reservoirs. The well performance results were compared in this paper between wells stimulated with novel and conventional diversion technologies as part of the evaluation.

The continued dependence on fossil hydrocarbons and the need to increase oil and gas production present solider challenges to more effectively stimulate marginal reservoirs with cost effective and improved technologies. In carbonate reservoirs, this challenge to maximize production comes from the increase in the stimulated reservoir volume. Diversion techniques in acid stimulation treatment in carbonate reservoir plays a major role in improving the stimulated reservoir volume. A typical acid stimulation design includes the diverter stages in between acid stages with the objective of both temporarily plugging the stimulated intervals and directing the treatment fluids to other untreated intervals and enhancing far-field diversion. It is necessary that these diverting materials are completely degradable and non-damaging to the reservoir.

High temperature, high stress, pressure depletion, sour environment, and heterogeneity make certain carbonate reservoirs very complex and several diversion techniques have been tested in complex carbonate reservoirs over the last decade. In fact, enhancement in diversion technique for carbonate reservoirs is continuously being explored by the local well stimulation network team. Because of extreme reservoir complexities and heterogeneities in multifaceted carbonate reservoirs, it is critical to select an appropriate diversion technique along with optimum acid blends to redirect stimulation fluids from treated intervals to untreated intervals. The post-stimulation high resolution temperature logs and productivity index analysis indicated that wells stimulated with a novel diversion technology exhibited enhanced production due to its ability to produce more uniform distribution of acid along the net pay intervals.

The novel diversion technology consists of multi-modal, self-assembling, self-removing, and environmentally friendly particles, presented in dry solid form to provide quicker and stronger redirection of fluid-flow paths by using the particle-bridging technique and sealing-off the width near the fracture's tip. More effective stimulation is achieved by branching fractures from subsequent stages as a result of far-field diversion.

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