Semianalytical Horizontal Well Length Optimization Under Pseudosteady-State Conditions

In this paper horizontal well length optimization under pseudosteady-state flow conditions considering pressure drop in wellbore is presented. To describe reservoir pressure change during production period, universal material balance method was used. Generalized well length optimization model was formulated to maximize an economic effectiveness which was measured using net present value ratio because this indicator takes into account a relationship between net present value and capital costs. The optimization problem was defined and solved. The presented method is intended for fast evaluation of horizontal well length. A new coupled model is more practical and flexible for the wide range of reservoir properties and technological parameters.