Research on Production Pattern Optimization of Intermittent Wels

Abstract

The study is focused on tight sandstone gas reservoirs with poor physical properties. The Sulige gas field is considered as an example gas reservoir: As the number of low-productivity and low-efficiency wells increases every year, the intermittent production scheme provides a way to maintain the stable production of those wells. However, the existing differences in the classification of intermittent wells and the production pattern are not conducive to the standardized management of gas wells. Therefore, according to the geological characteristics of intermittent wells, as well as the production performance, the intermittent wells were classified into three types: natural decline type (ND), poor reservoir physical property type (PRPP), and liquid loading type (LL). Furthermore, the charts of optimal shut-in time for different types of intermittent wells were established by analyzing the relationships between the shut-in time, the pressure recovery degree, and the gas productivity growth rate. Finally, according to the optimal shut-in time chart, the research results reveal the reasonable and optimal shut-in time in a well, providing the way to the production pattern optimization of the intermittent wells in the Sulige gas field.