闵桥油田疏松砂岩油层在无防砂条件下最大产量估算

Estimating maximum output of loose sandstone oil reservoir without controlling sand production at Minqiao oil field.

闵桥油田闵南断块区属于岩性构造油藏，断层多，地质构造复杂，开发难度较大。１９９７年油藏重新开展了勘探开发评价工作，但该断块埋深较浅，地层胶结疏松，油井容易出砂，增加了开发难度。为此，在油井投产初期进行了防砂措施预测研究。主要是利用测井数据和Ｍｏｈｒ圆应力分析原理，计算出在不同地层压力下油层出砂的最大生产压差和最大产量极限值，油井投产后，把指标控制在这个极限值内，可以延长检泵周期，达到防砂的目的。但应当指出的是：这个极限数值是代表限定的流量，高于这个流量预计会出现出砂问题，而不是指该井能够生产的最大产量。图３参４（骆瑛摘）

Minnan fault block of Minqiao oil field belongs to lithologico-structural oil researvoir, where there are many faults and its geologic structure is complex, which causes difficulty in development. The evaluation of exploration and development for this oilfield was done again in 1997, the shallow buried depth of the fault block, the unconsolidation of the formation and sand production easily cause difficulty in development. Under this circomstance, the research for controlling sand production was done at initial period of oil production. By utilizing the logging data and the principle of Mohr stress analysis, the maximal pressure difference of production and the maximal limit value of production of sand production caused by different formation pressure has been calculated. After oil wells are putting into production and the indexes are controlled within limit value, periods of checking pump can be prolonged and sand control can also be achieved. But it has to be pointed out that the limit value only stands for limit flow and if the flow in a well is highter than the limit, a sanding problem will be resulted in. In this case this limit is not the maximal production of well.