Abstract
Composite technology of hydraulic and acid fracturing for carbonate reservoirs has been conducted in the Taiyuan formation of Changqing Oilfield and has achieved good production effects. However, in long-term production, the fracture flow conductivity will inevitably decrease, which will affect the overall production capacity. Therefore, it is necessary to conduct simulation work to clarify the fracture conductivity and production decline law under the composite technology of hydraulic and acid fracturing. The general discrete element method involves unstructured refinement of the mesh around the fracture, which can improve simulation accuracy but also increase computational workload and difficulty. Based on the above situation, we used the EDFM (Embedded Discrete Fracture Model) method to simulate the production of carbonate reservoirs containing artificial fractures. The results show that there is a spatiotemporal decrease in composite conductivity formed by the composite technology of hydraulic and acid fracturing, whether it is the main or branch fractures. The decrease in fracture conductivity has a significant impact on production. The more proppant is filled in the branch fracture, the greater the production of the gas well. Therefore, in actual production, filling some small particle size proppants in the branch fracture can improve the yield increase effect.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call