基于压差法的水平井岩屑床轴向运移规律研究  

Study on Axial Transport Laws of Cuttings Bed in Horizontal Wells Based on a Differential Pressure Method

作　　者：荆思霖 宋先知[1] 孙一 许争鸣 周蒙蒙 JING Silin;SONG Xianzhi;SUN Yi;XU Zhengming;ZHOU Mengmeng(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing,102249,China;School of Energy Resources,China University of Geosciences(Beijing),Beijing,100083,China)

机构地区：[1]油气资源与工程全国重点实验室(中国石油大学(北京)),北京102249 [2]中国地质大学(北京)能源学院,北京100083

出　　处：《石油钻探技术》2024年第1期54-61,共8页Petroleum Drilling Techniques

基　　金：国家自然科学基金国家杰出青年科学基金项目“油气井流体力学与工程”(编号:52125401);国家自然科学基金重大项目“干热岩地热资源开采机理与方法”课题二“高温岩石动态损伤机理与高效破碎方法”(编号:52192624);国家自然科学基金面上项目“钻柱旋转对大位移水平井全井段岩屑流型影响机制研究”(编号:52274019);中国石油大学(北京)优秀青年项目“大位移井岩屑临界流速影响因素相互作用机制研究”(编号:2462022QNXZ004)联合资助。

摘　　要：为了明确长水平段水平井旋转钻进工况下水平段岩屑床的轴向运移规律,开展了基于压差法的水平井岩屑运移试验。利用设置在井筒轴向不同位置的多个压差传感器,测量井筒的瞬时压降,用来表征岩屑床在井筒中的轴向分布,并据此计算了岩屑床运移速度,分析了流体密度、排量、转速对岩屑床运移速度和压降的影响规律。结果表明:该方法能够表征岩屑床运移特征,精细刻画了岩屑床在井筒轴向位置的分布;岩屑床运移速度与流体密度、排量和转速呈正相关关系;排量增大,可显著提高岩屑床运移速度,但压降迅速增大限制了加快清岩的最大排量;转速增大,能够提高岩屑床运移速度,且对井筒压降基本没有影响。研究结果明确了水平井岩屑床的轴向运移规律,为井下岩屑床轴向分布测量提供了理论基础,并有助于规避井筒压力复杂和卡钻等风险。To investigate the axial transport law of cuttings bed in the horizontal section of long horizontal wells during rotary drilling,cuttings transport experiments of horizontal wells were conducted based on the differential pressure method.This method utilized differential pressure sensors located at different axial positions in the wellbore to measure the instantaneous pressure drop in the wellbore.These data were used to characterize the axial distribution of cuttings bed in the wellbore and calculate the cuttings bed transport velocity.The impact of fluid density,flow rate,and drill pipe rotation speed on the cuttings bed transport velocity and pressure drop was analyzed.The results indicate that this method effectively describes the characteristics of cuttings bed transport and accurately depicts the axial distribution of cuttings bed within a wellbore.Cutting bed transport velocity is positively correlated with fluid density,flow rate,rotary speed.Increasing the flow rate significantly improves the cuttings bed transport velocity,although a rapid rise in pressure drop limited the maximum flow rate.Increasing the rotary speed can significantly improve the cuttings bed transport velocity and has almost no effect on the wellbore pressure drop.The results provide clarification of the axial transport law of cuttings bed in horizontal wells,providing a theoretical foundation for measuring the axial distribution of downhole cuttings bed and assisting in avoiding the risks of complex wellbore pressure and pipe sticking.

关 键 词：水平井 压差法 轴向分布 排量 转速 岩屑床运移速度 

分 类 号：TE21[石油与天然气工程—油气井工程]