超高压淹没射流井底流场特性模拟分析  

STUDY OF CHARACTERISTIC OF DOWNHOLE FLOW FIELD UNDER THE ENVIRONMENT OF ULTRA-HIGH PRESSURE SUBMERGED JETTING

作　　者：董学成[1] 熊继有[1] 黄卿卿 廖刚[1] 荣继光[1] 许期聪 魏武 

机构地区：[1]油气藏地质及开发工程国家重点实验室.西南石油大学 [2]中国石油集团海洋工程有限公司 [3]川庆钻探工程公司钻采工艺技术研究院

出　　处：《钻采工艺》2010年第2期72-75,共4页Drilling & Production Technology

基　　金：国家自然科学基金资助项目"西南油气深井物理法随钻防漏堵漏"(编号:90610013)部分研究成果

摘　　要：超高压淹没非自由射流井底流场特性研究是超高压喷射钻头设计的关键技术之一,是延长钻头寿命、提高钻井速度、实现优快钻井的保障。目前关于高低压喷嘴联合作用下的井底流场特性的研究还不完善,文章通过建立井底流场计算域,运用数值模拟手段,在K-ε两方程数学模型基础上计算封闭的N-S方程,对Φ215.9mm三牙轮超高压淹没射流的井底流场进行模拟。随着超高压喷嘴侧倾角从10°减小到8°,超高压射流流体上扬趋势变缓;超高压射流井底流场高低压区分区明显。分析认为超高压喷嘴射流能量大部分集中在高压喷嘴直径范围内,高低压喷嘴射流之间的相互干扰不大;超高压喷嘴射流直射井底与井壁交界处产生的流场特性有利于钻屑的运移和井底的清洗,且其产生的扩径率符合工程要求;喷嘴直径、喷射压力、喷射角度、喷距等对井底流场特性有影响。此方法为延长钻头寿命、提高钻井速度、实现优快钻井提供了保障。The features of bottomhole flow field under the condition of the ultra-high pressure submerged jetting were analyzed by using numerical simulation.This method can resolve the problem of optimal design for the multiinjector.When the heeling angle of ultra-high pressure nozzle change from 10 to 8,uptrend of ultra-high pressure flow slow down;the high and low pressure area of downhole flow field show very clear.The analysis results showed that the energy of jetting mostly concentrate in the diameter's scope of the high pressure nozzle,the mutual interference between high and low pressure nozzle is small,the flow field's characteristic caused by high pressure jet on the boundary of sidewall and bottom hole is conducive to the migration and clearing of the drill cuttings from the bottom of the well.The expanding-ratio caused by high pressure jet on the boundary of sidewall and bottomhole meets the demands of engineering standard.The nozzle diameter,jet pressure,jet angle and jet distance have influence on the bottomhole flow field's characteristic.

关 键 词：深井 超深井 超高压淹没射流 井底流场 数值模拟 

分 类 号：TE21[石油与天然气工程—油气井工程]