| Popis: |
The tight sandstone gas reservoir in He8 member of Upper Paleozoic in the certain area of Sulige gas field is braided river delta plain deposit, the multi-stage channel sand bodies are frequently migrated horizontally and vertically intersected and superposed, the internal structure of sand body is complex, the reservoir heterogeneity is strong, and the geological guidance of horizontal well is difficult. In order to further improve the drilling effect of horizontal wells, according to the understanding of the latest achievements such as the genetic type of sand body and its spatial superposition relationship in the gas reservoir in the study area. The precise access target of horizontal well and the geological guidance technology of horizontal section while drilling in the certain area of Sulige gas field have been scientifically formulated; Considering the current situation of exploration and development in different zones, combined with the development experience of completed horizontal wells, in-depth research has been carried out on sedimentary facies analysis, 3D geological modeling, 3D seismic prediction, etc., the joint decision-making of geology, well logging, seismic and other disciplines has been strengthened, the new comprehensive guidance method of “fine correlation of small layers and into target, geological multi-dimensional description in small scale, real-time prediction of seismic in large direction” has been innovated, the fine geological guidance of horizontal well in different conditions of tight sandstone gas reservoir has been achieved. The field application shows that the average length of horizontal section of the horizontal Wells is 1387 m, the drilling rate of reservoir which is about 7% higher than the average value over the years is 86.6%, the drilling rate of gas reservoir is 69.8%, and the drilling rate of gas reservoir was increased by more than 10%. |
