基于出砂特征半径的水平井出砂临界生产压差预测模型  

Prediction model for critical sanding pressure drawdown in horizontal wells based on characteristic break radius

作　　者：尉亚民[1,2] 王爱萍[3] 董长银[3] 刘春苗[3] 

机构地区：[1]中国石油大学地球资源与信息学院,山东青岛266555 [2]青海油田公司钻采工艺研究院,甘肃敦煌736200 [3]中国石油大学石油工程学院,山东青岛266555

出　　处：《中国石油大学学报（自然科学版）》2011年第2期85-90,共6页Journal of China University of Petroleum(Edition of Natural Science)

基　　金：国家自然科学基金项目(50704035);国家'863'计划项目(2006AA09Z351)

摘　　要：在水平井近井地带地应力分布研究基础上,首次提出破坏特征半径的概念,以特征半径处作为地层破坏出砂的判断位置,分别使用Mohr-Coulomb准则、Drucker-Prager准则、Hoek-Brown准则建立相应的水平井出砂临界生产压差预测模型,并对水平井出砂临界生产压差计算结果进行敏感性分析。结果表明:水平井出砂临界生产压差与井斜角有关,其具体变化规律与原始主应力中垂向主应力与最大水平主应力的关系有关;在同一地区,水平井水平段方位的选取会明显影响其生产中的出砂程度;水平井出砂临界生产压差与特征位置半径的选取有直接关系。Based on the formation stress distribution model around horizontal wellbore,the concept of characteristic break radius was put forward firstly and used as the evaluation location to judge whether the well sanding or not.Three rock failure criterions,which concerns Mohr-Coulomb,Drucker-Prager and Hoek-Brown,were applied to develop the critical downhole pressure condition,and the corresponding critical sanding pressure drawdown prediction models were established.The model was used to analyze the effect of production parameters and rock characteristic on the critical sanding pressure drawdown.The results indicate that the critical sanding pressure drawdown is related to the hole angle,but the varying tendency depends on the relationship of initial formation vertical stress and maximum horizontal stress.In the same reservoir,the well orientation angle affects the sand production degree directly.In addition,the critical sanding pressure drawdown changes with the characteristic break radius obviously.

关 键 词：水平井 地应力 出砂预测 出砂临界生产压差 出砂特征半径 

分 类 号：TE257[石油与天然气工程—油气井工程]