油层微型构造影响油井生产机理研究

MECHANISM OF THE EFFECT OF RESERVOIR MICROSTRUCTURES ON OIL WELL PRODUCTION

对微型构造的定义、成因、分类作了简要论述。提出“注入水油水界面”的概念，指出在油层内部油井水淹停产是由于此“界面”上升至油层顶面所引起。对微型构造影响油井生产的机理作了论证，通过数学公式推导，证明在通常条件下，正微井控制油层面积大于负微井，油水重力分异作用对正微井有利。引用莱弗里特方程证明正微井在注水开发中处于向上驱油的有利条件，而负微井则处于向下驱油的不利条件，还有部分低部位油向高部位运移。因此，正微井生产普遍比负微井好。

This paper briefly discusses the definition, genesis end classification, proposes the concept of waterflooding oil water interface, indicates that the raising of this interface to the top of the reservoir makes the oil well watered out and stop production in the reservoir, and confirms the mechanism that microstructures influence oil well production. Deviration of mathematical equations confirms that the reservoir area controlled by the wells of the positive microstructures is larger than that by the wells of the negative microstructures under normal conditions, and the gravitational differentiation of oil and water is favourable for the wells in the positive microstructures. Leverett's equation confirms that the oil wells in the positive microstructures are under favourable conditions of driving oil upward in waterflood recovery while that in the negative microstructures are under unfavourable conditions of driving oil downward. A part of oil in low position migrates upward to high position. Therefore , the production in the oil wells of the positive microstructures is better than that in the oil wells of the negative microstructures.