特高含水期非均质油层动用状况评价方法

doi:10.11885/j.issn.1674-5086.2012.11.10.03

摘要/Abstract

摘要：

特高含水期水驱油藏层间、井间动用程度差异大，需要通过注采系统调整与结构调整等挖潜措施提高薄差油
层的动用程度。基于采收率与波及系数、驱油效率的关系式，引入了驱油效率系数这一概念，用于描述多层非均质油
藏的动用状况，并建立了多层非均质油藏小层驱油效率系数与采收率的关系式，结合数值模拟结果，计算了每个小层
的驱油效率系数。通过分析压裂、堵水、细分注水等结构调整措施前后的驱油效率系数累积分布曲线形态、驱油效率
系数平均值与变异程度的变化，反映油层间动用程度的差异及高低。结果表明，措施后驱油效率系数累积分布曲线向
右偏移、斜率变大、驱油效率系数的变异程度变小、平均值变大，说明非均质油层的动用程度和动用不均匀状况得到明
显改善，实现了对油层动用程度的定量分析。为特高含水期非均质油层动用状况评价提供了一种新方法和理论依据。

关键词: 精细挖潜, 油层非均质性, 驱油效率系数, 动用程度, 结构调整措施

Abstract:

The interlayer and interwell producing degree are very different in the water drive reservoir during the stage of
extra-high water cut. Based on the relational expression of the recovery，the sweep efficiency and the displacement efficiency，
this paper introduces the conception of flushing efficiency coefficient to describe producing degree of multilayer heterogeneous
reservoir and establishes the relational expression of recovery and flushing efficiency coefficient of the multilayer heterogeneous
reservoir. With the result of the numerical simulation，we calculate the flushing efficiency coefficient of every sublayer. We also
find out the difference of interlayer producing degree by analyzing the variation of cumulative distribution curve shapes，and
average values and variability of flushing efficiency coefficient before and after the structural regulation of fracturing，water
plugging，subdivision water injection and so on. The result illustrates that the cumulative distribution curve shifts towards
right whose slope becomes bigger，the variability of flushing efficiency coefficient becomes smaller and the average values of
flushing efficiency coefficient becomes bigger. Those demonstrate that the producing degree of heterogeneous oil layers and
uneven producing condition has been improved，and quantitative analysis of the producing degree of the oil layers has been
achieved. Therefore，this paper provides a new method and theoretical foundation for the producing degree of heterogeneous
oil layers during the stage of extra-high water cut.

Key words: fine tapping potentialities, oil layer heterogeneity, flushing efficiency coefficient, producing degree, structural
regulation measure

穆文志. 特高含水期非均质油层动用状况评价方法[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.11.10.03.

Mu Wenzhi. Evaluation Methods of Producing Degree of Heterogeneous Oil Layer
During the Stage of Extra-High Water Cut[J]. 西南石油大学学报(自然科学版), DOI: 10.11885/j.issn.1674-5086.2012.11.10.03.

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