WZ油田产能分析与预测研究参考.docVIP

单位代码：10615 西 南 石 油 大 学 工程硕士学位论文 论文题目： 摘 要 ?本文在国内外产能评价方法的调研基础上，对WZ油田进行产能评价与预测。由于油田储层物性总体呈现出渗透率低的特性(1)打开程度不完善将引起附加的几何表皮，当打开程度为50%时，油井采油指数仅为完全打开时的55%-65%。如果无需考虑底水避射高度等方面的问题，在条件允许的情况下，应尽量完全打开储层。 (2)储层应力敏感效应将导致油井产能下降。渗透率越小，下降程度越大，总体上在10%以内，渗透率在50mD以上时产能下降在2.5%以内。 (3)启动压力梯度的存在将导致相同压差下油井产能降低。研究表明，油田启动压力梯度对油井产能的影响将可达20%，甚至更大，这取决于启动压力梯度的大小。 (4)多层合采会产生层间干扰，当井底流压降到最小地层压力以下时，各油层同时产液，干扰引起的产能损失很小，一般在10%以内。 (5)低渗封闭油藏原油弹性驱动下，由于无能量补充，油井产量下降迅速。 关键词：油田开发；试井；产能评价 Abstract In this paper, based on the research of the evaluation methods of productivity at home and abroad, we evaluate and predict the productivity of WZ oilfield. Because of the complex geological characteristics and flow characteristics of low permeability reservoir, the conventional seeping-rule is no longer adapted to the low permeability reservoir. Amount of research and application can prove that start-up pressure gradient、stress-sensitive and other non-linear features exist in low permeability reservoir. By analyzing the different productivities in heterogeneous and stress-sensitive conditions、condition of kickoff pressure and the influence of different types of wells to the capacity of the complex reservoir productivity prediction, we get some conclusions as follows: (1) Partial penetration will cause additional skin factor. When open degree was 50%, oil production index of oil well is about 55%-65% of which opens totally. (2) Reservoir stress sensitive effect will lead to the well productivity decline. The smaller the permeability, the bigger the degree of decline, it is within 10% in general and when the permeability is above 50 mD the productivity decline is within 2.5%. (3) Kickoff pressure gradient will lead productivity to decreasing in the same differential pressure. As is shown, the influence of kickoff pressure gradient on the oil well productivity will be 20% or more, which depends on the size of the kickoff pressure gradient. (4) Multi-layers will influence each other. When bottomhole wellbore press