A Novel Methodology for Stimulation Candidate Selection by Wellhead Pressure Transient Analysis

Tight sandstone gas reservoirs have challenges in reservoir pollution assessment, including the high cost and long lead time of bottomhole pressure testing. This paper proposes a novel method for simulation candidate selection based on wellhead pressure transient analysis, along with an evaluation of its application effectiveness. This method utilizes the wellbore energy conservation model and gas state equation to convert wellhead pressure data into bottomhole pressure. By integrating well testing technology to recover formation parameters, it demonstrates the reliability of wellhead pressure transient analysis techniques through practical case studies. Further, a new method for simulation candidate selection in the Sulige gas field, China, has been developed, centered on the skin factor (S>0) as the core criterion. Combining permeability and production potential analysis, eight target wells were selected for stimulation. Among them, six wells exhibited a decrease in skin factor to negative values, resulting in a significant increase in production capacity. An analysis of the application effects was also conducted. Research shows that this method can efficiently identify contaminated wells and quantify stimulation effectiveness, providing technical support for low-cost, high-efficiency well selection and effect evaluation in tight gas reservoirs.