Study On Optimal Design Of Water Flow Control Of Horizontal Well Completion

Horizontal wells can increase the contact area between wellbore and oil and gas zone,and provide more seepage channels than vertical wells,and achieve higher productivity.However,through years of field experience and theoretical analysis,the researchers point out that if the oil and gas reservoirs with gas top or bottom water,if the production well crosses multiple layers,or the reservoir heterogeneity on a single horizontal layer is too strong,it is easy to occur unbalance.Gas well water will flow into the production well and disrupt production plan.According to the mechanism of gas and water reservoir migration,we can quantify the time of water breakthrough and the critical productivity of production well.The reservoir and wellbore coupling model was established,the water control structure and the working principle of the balance sieve tube were analyzed.The horizontal section flow pressure and flow rate distribution under the conventional well completion mode and the horizontal well controlled water and water control completion mode were calculated respectively,and the parameters of the horizontal well controlled water and water control completion were optimized.Horizontal well flow water control completion parameters optimization design and simulation evaluation software.The calculation results show that the balanced screen completion method can effectively delay the water breakthrough time and increase the production volume without water.