水平井水驱开发的经济技术界限及敏感性分析

应用渗流力学、地质学以及技术经济等理论，计算水平井泄油面积、控制储量、水平井开发所需的经济极限总产油量及单井经济极限日产油量，分别对影响水平井产能和开发利润的主要因素（油井特性因素、油藏类型因素、地层损害程度因素）和经济指标进行了敏感性分析。并制定了敏感性分析图版。利用图版，可以确定适合水平井的地质条件及要求，并指导水平井注采井网系统的优化设计，同时对水平井开发的经济效益作出合理的评价。由研究结果可知，经济极限日产量随原油售价的增大而减小；水平段长度和封轴方向渗透率对产能指数最为敏感，而对于低渗透油藏，泄油半径对产能指数非常敏感，甚至最敏感，因此要尽量减小泄油半径。原油售价和产量对经济效益最敏感，其次是钻井投资（包括地面设施等），因此要努力提高原油产量，降低水平井的钻井投资。

The Economic Technical Limitation and the Sensitivity Analysis of Horizontal Wells in Oilfield Waterflood Development

The theory of fluid mechanics in porous medium ,geology and technical economics theory was applied to calculating the drainage area,controlled reserve,the economic limit total rate and economic limit daily oil production of the horizontal wells.Main factors （oil well characteristics,oil reservoir type and formation damage degree） and economic indicators of affecting productivity and development benefit of the horizontal wells were analyzed.And the sensitivity plot was drawn.Using the plots can determine the geologic conditions and the requirement that is suitable to the horizontal well development.Optimization design of flood pattern system of the horizontal wells can be guided.Economic benefit of the horizontal well development can be evaluated reasonably.The study results show that economic limit daily oil production decreases with the increase of oil price.To productivity index,interval length and permeability of Y axis are the most sensitive and drainage radius is sensitive even the most in low permeability reservoirs,so the be low enough.Crude oil price and yield are the most sensitive to economic benefits drilling investment（including ground facilities and so on）.Therefore,it is necessary to drainage radius should ,more sensitive to the enhance the output of crude oil and reduce the drilling investment.