Integrated Techniques in Tight Reservoir Development for Horizontal Wells in Block Shun 9

Block Shun 9, a Silurian clastic reservoir, is characterized by deep burial depth and high temperature, poor physical property and bottom water development. Due to the lack of stable productivity for vertical wells after hydraulic fracturing in the primary stage in Block Shun 9, the integrated development performance for horizontal wells was studied. Based on integrated drilling, completion and hydraulic fracturing, a horizontal well was drilled in NE137.7°, perpendicular to the maximum horizontal stress, to increase oil drainage area for a later production stage. Oil based drilling fluid was used to prevent borehole instability issues and to more easily set the completion packer. In this case, the optimal packer in open hole could be used under 130℃ and 70 MPa, and the target stimulation section was selected in the fracture developed zone th facilitate fracture initiation. Fracturing fluid was developed that would have a lower damage rate to reservoir and would be able to resist 130℃ reservoir temperature by reducing the concentration of guar gum and optimizing the additive. a numerical reservoir simulation was conducted to optimize the parameters of fracturing treatment. Conventional methods and a designed barrier for fracture height control were used to control fracture height and keep them within 30 m to avoid connection with the water zone. The techniques of integrated tight reservoir development with horizontal well in Block Shun 9 were developed. The application in two wells showed that the productivity of horizontal wells after hydraulic fracturing was 4 times higher than that from vertical wells, and oil production reached to 1.02×104 m3. This study demonstrated that integrated development with horizontal wells is an effective method in tight reservoir development in Block Shun 9, and can be taken as a reference to the development of tight reservoirs.