摘要: |
采用等值渗流阻力法,推导出了低渗油藏水平井稳定渗流产量公式、溶解气驱油气两相流产能方程及无因次 流人动态方程。流人动态方程简单明了,与Wiggins方程形式一致。产能影响因素分析结果表明:中高渗油藏的流 动是启动压力梯度为零的低渗油藏流动的一个特例;随着启动压力梯度的增加,水平井产能明显递减;水平井长度 越长,产量越大。 |
关键词: 低渗油藏 水平井 等值渗流阻力法 溶解气驱 流入动态关系 |
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基金项目:中石化科技攻关项目(P06074) |
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Establishment of inflow performance relationship of horizontal wells in low-permeability reservoir |
YAO Jun1,LIU Shun1,XU Yuan-gang2
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(1. College of Petroleum Engineering in China University of Petroleum, Dongying 257061,Shandong Province, China;2. College of Petroleum Engineering in Xi'an Shiyou University, Xi'an 110065 jChina)
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Abstract: |
The productivity equations in steady fluid flow and oil-gas two-phase flow with solution gas drive of horizontal wells in low-permeability reservoirs were established by equivalent flowing resistance method. And the dimensionless inflow per-fonnance relationship of horizontal wells was given. The equations of inflow performance relationship are simple and clear, and correspond with Wiggins equations. The results show that the flow in middle and hi^i permeability reservoirs is only a special case of flow in low-permeability reservoirs when the starting pressure gradient equals to ^ero. The productivity for horizontal wells in low-permeability reservoirs decreases with the starting pressure gradient increasing. And the productivity for horizontal wells increases evidently with the length of horizontal well increasing. |
Key words: low-permeability reservoir horizontal well equivalent flowing resistance method solution gas drive inflow performance relationship |