Analysis of Inflow Capacity in Horizontal Wells with Wellbore Pressure Drawdown

Under the condition of single facies and steady status,a coupling model for reservoir percolation and wellbore flow was established for calculating productivity of horizontal wells.An error model was established for calculating wellbore pressure drawdown on steady productivity of horizontal wells,on the basis stated,the sensitivity of influential factors on steady productivity calculation in horizontal wells was analyzed.Study shows that when the horizontal section is 400m long and the relative roughness of well bore is 0.01,productivity is 1150m3/d and productivity error E is 10%.By using E,the application range of inflow capacity in horizontal wells is analyzed more effectively.When E is more than 10%,it can not be ignored,therefore,the upper limit of E is 10%.