Study And Application On Perforating Parameter Of Horizontal Wells In Sandstone Reservoir

This paper is taking uniform horizontal profile section， preventing bottom water ofrapid growth, improving recovery as the goal. Based on the investigation of the massiveliterature, the common horizontal well productivity models are compared and analysised. Theresults indicate that it ignores the influence of formation damage and well completion methodon the productivity of horizontal wells when it is modeled and solved, which lead thedeviation of actual production capacity and productivity. These models are not availableproductivity evaluation of perforated horizontal well. Using the semi-analytical method, thehorizontal well productivity evaluation model coupled of the three-dimensional flow ofreservoir and multiphase flow pressure drop is built,the model fully describes the effect ofdrilling pollution, wellbore pressure drop, multiphase flow and completion parameters on theproductivity of horizontal wells, which is used as the tool for horizontal well perforationproductivity evaluation.Method to optimize the perfortation parameter for horizon well insand reservoir are formed by analyzing the effect of horizon well productivity and fluidprofile caused by wellbore parameter,reservoir parameter and perforation parameter.Thereserach show that in casing cemented,perforated horizontal well,many perforation factorshave effect and influence of various factors are considerd as a whole, production can beoptimized;For perforated horizontal well,some length or a certain length by optimized areopened for production,result is the same to the whole opened well; and for inhomogeneousreservoir, wellbore inflow profile is adjusted by changing perforation density, then the bottomwater coning can be effectively prevented.20wells are applied with this optimization methodfor horizon well,and the speed of rise for water cut fall2.4percentage points.Which showsOptimizing horizontal well perforation parameters to adjust the water profile will improve theproducing degree for horizontal segment and delay the speed of rise for water cut.