油井措施增油量的不均衡性分析

对于进入中后期阶段的油田，需要通过增产措施来提高油井的产量，但油井措施有效井次和措施增油量之间存在着一定的不均衡性。采用经济学中用于测定和描述不均衡性的洛伦兹曲线和基尼系数的分析方法，结合某油田开发数据的实例．对措施有效井次和措施增油量的不均衡程度进行了分析。在以单井次平均增油量分组的基础上，根据油田措施有效井次和措施增油量计算的百分数和累计百分数，采用3种不同的方法计算其基尼系数，得出的结论为：措施有效井次和措施增油量之间存在不均衡性，即比重较大的措施井次只能提供占总数比重很少的措施增油量，或占总体比重较小的措施井次提供了较大比重的措施增油量；不同方法算出的基尼系数结果大致相同。据此，油田可以进一步研究措施增油量大的井的地质结构、措施类型、作业方式等，以达到提高措施作业经济效益的目的。

Analysis on Unbalanced Nature of Incremental Oil Well Production by Stimulation Treatments

In the process of middlelater period of oilfield production,stimulation treatments should be carried out for increasing the production of oil wells ,but imbalance exists between effective welltimes and incremen tal oil production by the stimulation treatments.Lorenz curves used for determining and describing the imbal ance and analytic method of Gini coefficient in the economics are applied in the oilfield.Combined with a case of certain oilfield development data,imbalance degree between effective welltimes and incremental oil production by the stimulation treatments is analyzed.Three different methods are applied to calculating the Gi ni coefficient according to the percentage and cumulative percentage calculated by the effective welltimes and incremental oil production by the stimulation treatments after group is divided into by averages incremen tal oil production of single welltimes.The conclusion is：imbalance exists between effective welltimes and incremental oil production by the stimulation treatments ,that is to say,more welltimes of the measures may only provide less incremental oil production by the stimulation treatments and vice versa.Gini coefficient is approximate through different methods.So,the geologic structure,measure type and operation way of the wells with large incremental oil production by the stimulation treatments should be researched further in the oilfield so as to enhance the economic benefit of the operation by the measures.