Bacteria and Microbiologically Induced Corrosion Control in Unconventional Gas Field

摘要

The unconventional gas field comes with the new energy opportunity but also presents new challenges. One of the challenges is the bacteria and Microbiologically Induced Corrosion (MIC) control due to its more complex water production and use system when the frac fluid reuse a large amount treated produced water compared to the conventional gas field. In the Pinedale field, biocide treatment was applied both to the frac fluids and produced fluids handled in the surface facilities to limit MIC and reservoir souring. After several years of operation treatment regime was such that yearly treatment costs were above $2 million in 2009. In 2010 a study was performed to re-evaluate the risk for MIC and souring and identify areas for possible cost optimization. This paper reviews the learning in dealing with bacteria and MIC in the Pinedale unconventional gas field. The 2010 bacteria and MIC investigation helped the asset better understand the threat of bacteria and MIC, helped to improve the corrosion/leak/spill mitigation program for all key business processes: drilling, completion, surface production, water disposal and water recycle. The direct business impact is to improve the effectiveness of bacteria/MIC control and optimize the use of the annual OPEX on bacteria control. The long-term business impact is to comply with governmental regulations related to HSE.