Multistage Fracturing Proves Oil Potential in Low-Permeability Reservoirs in Thailand’s S1 Basin

Abstract

Abstract Low-permeability sandstone formations in a deviated well were drilled and completed in 2010 by an oil company in Thailand. Openhole logging data and reservoir simulation modeling of multiple zones showed that the well would not produce because of tight formations. Artificial lifting calculations showed that the well was not likely to achieve hydrocarbon production targets for this well in its current condition. Multistage hydraulic fracturing was then considered for the well, and a plan was adopted to use this method to improve the well’s production while using reservoir simulations to optimize the fracture design. These methods were meshed with the completion and cleanout strategies to improve the well’s performance. The fracturing design was incorporated into a complete operational procedure, along with contingency plans, a decision tree, and an integrated communications plan to allow for any eventuality. The careful planning resulted in the first successful multistage hydraulic fracturing operation in a deviated well in Thailand. The success resulted from careful planning, fluid testing, and a completion design that was fit-for-purpose, in conjunction with the well testing, to provide an excellent operational stimulation plan and execution. Better-than-expected production from the well demonstrates that multistage fracturing in a deviated well in north Thailand can be successful and that this is a viable method for enhanced oil recovery (EOR) and improved well economics. This paper presents the well production results and operational procedures used to demonstrate that multistage fracturing is a viable method of completion in Thailand. Pressure matching and leakoff information gained from this operation will be of value in future fracturing operations to help improve those treatment designs