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对西西伯利亚油田2005—2006年所做压裂水平井进行了综合分析。讨论了成功选择压裂水平井候选井的一系列标准,给出了压后产量预测的统计关系曲线,对影响长期生产动态的重要因素作了说明。依据现场最佳效果和本研究结果,开发出一项新的优化设计压裂作业法。利用多相流油藏模拟器和拟三维压裂模拟器对结果进行了模拟研究:①未进行压裂的水平井产量(“基础”情况);②处理井动态(“真正”情况);③以新开发的优化设计法为基础的处理井动态(“理想”情况)。利用“真正”情况的拟合扇形模型确立出压裂后影响产量保持长期生产的一些重要因素,如泄油区域油藏压力下降,探讨了重复压裂问题。通过这些油井动态对比可以评估压后产量增加以及新设计方法实施后潜在增油情况。
A comprehensive analysis of the fractured horizontal wells made in the West Siberian Oilfield from 2005 to 2006 was carried out. A series of criteria for successful selection of candidate wells for fracturing horizontal wells are discussed. The statistical relationship between the post-press production forecasts and the important factors affecting the long-term production dynamics are described. Based on the best results in the field and the results of this study, a new optimized design fracturing operation was developed. The results were simulated using a multiphase reservoir simulator and a quasi-3D fracturing simulator: (1) horizontal well production without fracturing (“base” condition); (2) processing well dynamics Conditions); (3) processing well dynamics based on the newly developed optimization design method ( “ideal ” case). The fitting fan model of “true” condition establishes some important factors that affect the long term production after fracturing, such as the decrease of reservoir pressure in the drainage area and the problem of repeated fracturing. Dynamic comparisons of these wells allow the assessment of increased post-press production and potential oil increases after the implementation of the new design approach.