摘要
在定向井和水平井钻井过程中,准确预测钻柱屈曲条件下的环空压降,能有效优化定向井钻井参数、提高钻井效率。文中应用等效偏心度将屈曲环空简化为偏心环空,建立了钻柱屈曲条件下的环空压降简化模型,同时使用ANSYS Fluent软件进行了钻柱屈曲条件下的环空仿真模拟,并将简化模型结果与实验测试结果、Fluent仿真结果进行了对比验证。研究结果表明,在一个正弦屈曲周期内,环空压降比呈现先增大后减小的趋势,环空压降比随流性指数、环空内外径比和偏心度的增大而减小。文中建立的简化模型能够实现屈曲环空压降的准确预测,为定向井和水平井的井底压力计算提供了理论支撑。
During the process of directional well and horizontal well drilling,accurately predicting the annulus flow pressure drop under the condition of the drill string buckling(DSB)can effectively optimize the drilling parameters of the directional well and improve the drilling efficiency.In this article,using the equivalent eccentricity to simplify the buckling annulus to the eccentric annulus,a simplified model of the annulus flow pressure drop under the condition of the DSB is established.At the same time,ANSYS Fluent software is used to simulate the annulus flow under the condition of the DSB,and the simulation results are compared with the simplified model and experimental data.The results show that:in a sinusoidal buckling cycle,the pressure drop loss of the annulus increases first and then decreases;the ratio of annular pressure loss decreases as the fluid flow index,the annular inner and outer diameter ratio,and the eccentricity increase.The simplified model established in this study can accurately predict the pressure loss of the buckling annulus and provide theoretical support for the accurate prediction of the bottom hole pressure of directional and horizontal wells.
作者
孔令豪
何世明
汤明
袁兰峰
张光福
KONG Linghao;HE Shiming;TANG Ming;YUAN Lanfeng;ZHANG Guangfu(State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China)
出处
《断块油气田》
CAS
CSCD
北大核心
2019年第3期375-379,共5页
Fault-Block Oil & Gas Field
基金
国家自然科学基金项目“基于多场耦合理论的页岩气水平井井壁失稳机理研究”(51574202)、“高温高压高含酸性气体的海相裂缝性地层溢流机理研究”(51774247)
四川省科技计划重点项目“高温高压裂缝性地层重力置换溢流机理与工业化应用研究”(2018JY0460)
