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Issue:ISSN 1006-5539
          CN 51-1183/TE

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    Your Position ：Home->Past Journals Catalog->2013 Vol.2

    Study on Sweep Efficiency of Well Pattern with Vertical Injector and Multilateral Horizontal Producer
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    Key Words：Multilateral horizontal well； Well pattern； Productivity； Sweep efficiency
    Abstract： The sweep efficiency of multilateral horizontal well injection and production pattern is an important parameter of water flooding development effect assesses and its study 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， the seepage area is divided into three resistance zones and derived are the productivity formula and sweep efficiency of well pattern with vertical injector and multilateral horizontal producer. Analyzed is the variation of the sweep efficiency along with the ratio of the branch length to well spacing and branch numbers in the condition of five-spot well pattern of multilateral horizontal well. The analysis results show that the sweep efficiency decreases when the ratio of the branch length to the well spacing increases and the sweep efficiency increases when branch number increases， the calculation results， with very high accuracy， are very close to the numerical simulation results and can meet the engineering calculation requirements.
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