斜井临界生产压差预测

Prediction of critical drawdown pressure for inclined well

王东辉 韩英 高娟 刘云 张建忠4 于洋洋

长江大学地球科学学院，湖北 荆州 434023 昆明理工大学国土资源学院，云南 昆明 650000 长江大学地球物理与石油资源学院，湖北 荆州 434023 冀东油田公司钻采工艺研究院 ，河北 唐山 063000

油层出砂是井底压降超过某个临界值后岩石骨架发生破坏引起的。从井壁稳定性的力学机理出发,分析了斜井应力分布的基本规律,建立了斜井出砂的临界压差力学模型，并根据绥中36-1油田7口井的基础数据进行了实例计算。计算结果表明：在同样的条件下，斜井的临界生产压差大于水平井的临界生产压差。利用该模型计算临界生产压差，完全可以满足生产需要。

The sand production will appear in well when the bottom hole pressure drawdown exceeds a certain critical value and the rock
skeleton is damaged. When the drawdown pressure reaches a certain value, the rock will be broken up, which causes a great number
of sand production in oil well. Based on the mechanical mechanism of wellbore stability, this paper analyzes the stress distribution
laws of inclined well. A mechanical model of critical differential pressure of sand production is established for inclined well. We
conduct the example calculation in terms of the basic data of seven wells in Suizhong 36-1 reservoir. The calculated results show
that the critical drawdown pressure of inclined well is higher than the one of horizontal well under the same condition. It can meet
completely the production need to calculate the drawdown pressure by using the model.