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Sweep Efficiency of Well Pattern with Vertical Injector and Multilateral Horizontal Producer
Author of the article:
Author's Workplace:China University of Petroleum
Key Words:Multilateral horizontal well, well pattern, productivity, sweep efficiency
Abstract:The sweep efficiency is an important parameter of water flooding development programming, the study of sweep efficiency is of great significance. Considering equivalent flow resistances and non-piston water flooding, a multilateral horizontal well is equivalent to a vertical well with enlarged borehole, and the flow region is divided into three resistance zones. The productivity formula and sweep efficiency of well pattern with vertical injector and multilateral horizontal producer are derived. Under the condition of five-spot well pattern of multilateral horizontal wells, the sweep efficiency which varies with the ratio of the branch length to well spacing and branch numbers is studied. The analysis indicates that the sweep efficiency decreases when the ratio of the branch length to the well spacing decreases and increases with branch number increases. The calculating result and the numerical simulation result are close, has highly accuracy and can meet the engineering calculation requirements.
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