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Evaluation of Sandstone Stimulation using Thermochemical Fluid Through Distributed Temperature Sensing and CT Real-Time Downhole Flow Measurement Tool


 Distributed Temperature Sensing (DTS) was used to evaluate a novel sandstone stimulation treatment based on exothermic reaction. The technology is based on injecting in-situ heat generating fluid (IHGF) that generate in-situ heat i.e., ~>400F and nitrogen pressure to mobilize and remove near well bore damage in sandstone formations. Distributed temperature sensing (DTS) in real-time was used for fluid placement, treatment optimization and evaluation. Coiled Tubing (CT) real-time downhole flow measurement tool was used to conduct injection profiling before and after pumping the IHGF.
 Application of exothermic reaction downhole is very challenging as generated pressure can exceed will head pressure, and generated heat can exceed well completion rating. To have advanced assessment of the technology, generated temperature and pressure increase was captured in real-time with distributed temperature sensing (DTS) coiled tubing telemetry. Hence, CT with fiber optic real-time telemetry was used to pump the IHGF in two injection wells to increase their injectivity. These real-time measurements provided the benefits of recording DTS and enabled recording the injection profile through its real-time downhole flow measurement tool.
 DTS and the CT real-time downhole flow measurement tool was used to acquire initial and post-treatment injection profiling of two water injection wells. The results were used in conjunction to optimize the IHGF placement. DTS was also conducted during and after pumping the IHGF to understand the heat generation in real-time and optimizing the treatment as needed. After the treatment, the injection profiling was conducted to evaluate the treatment.
 The paper describe the application of CT with fiber optic real-time telemetry for unique treatment involving exothermic reaction for sandstone stimulation. The successful treatment will positively impact sandstone stimulation in oil and gas industry. Results will enlighten the heat generation through IHGF resulted in removing the nearby well damage, followed by increase in injectivity and the effect of real-time measurements have in better treatment execution and evaluation.