测试生产中不同渗流机理下油气井出砂量分析  

Sand production volume of wells for different seepage mechanism during testing and production

作　　者：姜海龙 JIANG Hailong(College of Mechanic al Engineering, Xi＇an Shiyou Univers ity, Xi＇an Shanxi 710065, China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065

出　　处：《石油化工应用》2018年第6期21-28,36,共9页Petrochemical Industry Application

基　　金：陕西省自然科学基础研究计划项目:"延安气区上古生界致密砂岩气藏气体流动中微观扼流效应的研究";项目编号:2017JQ5114

摘　　要：测试生产期间,由于油气的渗流作用会导致直井出砂,若出砂量太大,可能埋住生产管柱。从相态、渗流模型、地应力三方面分析了径向渗流作用下直井近井地层岩石应力状态。岩石破坏服从莫尔库伦准则。计算结果表明:在均匀地应力场中,井壁围岩应力达到坍塌临界状态时,Darcy渗流作用的油藏坍塌不在近井地层内继续发展,而Darcy、DarcyForchheimer和考虑加速效应渗流作用的气藏井壁围岩应力满足一定条件时坍塌在近井地层内继续发展,其中考虑加速效应渗流作用的气藏井壁围岩应力最先达到临界坍塌状态并且坍塌更易在近井地层发展。非均匀地应力场中,即使考虑渗流作用,无论那种渗流机理作用的井壁围岩都最先在最小水平主应力方向上发生坍塌,考虑渗流作用后,可能在最大水平主应力方向上发生坍塌并且有可能最大,并给出了出砂量的计算公式。Due to the fluid flow, the sand production can occur for the vertical wells during testing and production. If the sand production volume is to excess, the wells can be scrapped. The Mohr-Coulomb criterion is used for the rock failure. The rock stress state near the wellbore is focused on by phase state, seepage models, in-situ stress. It is showed that when the rock stress reaches its critical collapse condition in a uniform stress field, the collapse of oil reservoir in Darcy flow will not continue to develop in the near-well formation.While the collapse of a gas reservoir in Darcy flow, Darcy-Forchheimer flow or accelerating flow will continue to develop in the near-well formation if the stress of adjacent rock reaches certain conditions. The collapse of a gas reservoir in accelerating flow is more liable to develop in near-well formation and the adjacent rock in this kind of flow is the first to reach its critical collapse condition. The wellbore collapse will occur at the minimum horizontal stress direction, whatever the flow model is. If the effect of fluid flow is considered, the wellbore collapse can occur at the maximum horizontal stress direction. The calculate method of the sand production volume is given.

关 键 词：加速效应 渗流 莫尔库伦准则 坍塌区域 出砂量 

分 类 号：TE312[石油与天然气工程—油气田开发工程]