压力衰竭油田全寿命期出砂风险预测研究

Risk prediction of sand production in life of pressure depleted oilfield

有效准确的对压力衰竭油田进行出砂定量预测具有重要的意义。为此,根据油田油藏资料、测井数据、完井方式等参数,利用SAND_PRO软件计算得到不同地层压力及含水率条件下的临界生产压差,并结合油田单井生产动态,从而预测油田各井出砂可能性。以南海西部某油田为例,研究了该油田两口井主要油气层位在不同储层压力条件下的临界生产压差,预测全寿命期不同年份出砂可能性,并进行了出砂影响参数敏感性分析。结果表明,随着储层压力衰竭,地层含水率上升,临界生产压差呈减小趋势,出砂可能性增加,因此在油田开发中后期,必须考虑出砂风险。

Quantitative sand prediction of pressure depleted oilfield is the focus in the study of sand production. Therefore, based on the oil reservoir data, logging data, well completion methods and parameters, the critical production pressure under the condition of different formation pressure and water-cut is calculated with SAND_PRO software. Combining with field single well production performance, sanding possibility can be determined. Taking the example of one oilfield, we calculated the critical production pressure with different reservoir pressure in two wells’ oil layers, and predicted the sanding possibilities in different years.Furthermore, we finished sensitivity analysis of sanding influence parameters. The results show that, with the depleting of pressure and rising of water-cut, the critical production pressure is decreasing and the sanding possibility is increasing. Therefore,we must consider the influence of sanding in the middle-late period of oilfield development.