The horizontal well and hydraulic fracturing technology are generally adopted to achieve industrialized gas flow. The large resistance in gas seepage of shale gas reservoir makes no productivity under natural conditions. The permeability of the reservoir with poor pore connectivity is between 10 –5 ~ 10 −3mD 4, 5, 6. Shale gas reservoir is typically characterized by low-porosity and extremely low-permeability. Shale gas has become an important replacement resource to make up for the shortage of conventional energy 2, 3, and it has affected profoundly the world's energy production and consumption patterns. ![]() By 2040, China is likely to be the largest shale gas producing area after North America 2. Deep shale gas resources will become the main body of natural gas production in the future. Since 2010, three industrial production demonstration zones in the marine shale gas reservoirs have been established in China, making China the third country in the world to realize the commercial development of shale gas reservoirs 1. The research results can be closely linked to the on-site production practice of shale gas wells, providing insights into designing optimized production strategy scheme. Finally, the pressure drawdown optimization strategy was carried out on the field test from the both production effect and economic benefits, which demonstrated that the best economic solution can generally be obtained in the early stage of production. The on-site production effects dominated by two different pressure drop methods was further compared, indicating that compared to depressurization production, the production reversion can occur in the controlled pressure production process and the EUR of single well can be increased by about 30% under the control of managed pressure drawdown approach. ![]() Hence in this paper, a theoretical production prediction model was proposed and verified with HIS RTA 2015by incorporating multiple pressure drawdown mechanisms and various non-linear gas flow process. The controlled-pressure production dynamic analysis was mostly conducted using numerical simulation, lack of rigorous theoretical support. The impact of water-shale interactions on the reservoir permeability was previously ignored in the managed pressure drawdown optimization. Due to strong stress sensitivity resulted from unconventional tight formationsit is of practical interest to formulate a reasonable pressure drawdown plan to improve gas extraction recovery.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |