深井钻井随钻测量压力脉冲信号传播规律研究  

Transmission Rules of MWD Pressure Pulse Signals in Deep Well Drilling

作　　者：朱利[1] 万里平[1] 李红涛[1] 李皋[1] 张宇睿[1] 唐海波[2] 

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),四川成都610500 [2]中石化西南油气分公司工程监督中心,四川德阳618000

出　　处：《石油天然气学报》2014年第6期108-113,7,共6页Journal of Oil and Gas Technology

基　　金：国家自然科学基金项目(51134004);国家重点基础研究发展计划(973)项目(2010CB226704)

摘　　要：针对深井钻井过程中面临的随钻测量难题,从井筒钻井液流动基本控制方程出发,综合考虑壁面剪切力、重力和黏性耗散作用,提出了深井钻井随钻测量压力脉冲传播速度和衰减系数的解析计算模型。建立了水平管压力脉冲模拟试验装置,模型计算结果与试验结果吻合较好。研究表明,脉冲频率、钻井液塑性黏度、流速对传播速度和衰减系数的影响明显,较低的脉冲频率、钻井液塑性黏度、流速有利于降低压力脉冲的衰减。深井钻井中,高温高压环境下的钻井液密度动态变化对压力脉冲的传播和衰减有着不可忽视的影响,受密度分布的影响,压力脉冲频率和衰减系数沿井深变化,并随循环时间的不同在下部井段呈现出差异。In consideration of the problems of MWD in deep well drillings and based on the basic control equations of wellbore fluid flowing and synthetic consideration of borehole shear force,gravity force and viscous dissipation,an analytical model was established for calculating the transmission velocity of pressure impulse of MWD in deep well drillings and attenuation coefficient.An experimental apparatus for pressure impulse in horizontal tubings was developed to verify the veracity of new model.The results show that the pulse frequency,drilling fluid plastic viscosity and flow velocity have major influence on attenuation coefficient,lower frequency,plastic viscosity and velocity are beneficial for the reducing pressure impulse.For deep well drillings,the dynamic variations of density in high temperature and high pressure environment have assignable effect on the transmission speed and attenuation coefficient distribution.Influenced by the distribution of density,the pressure impulse frequency and attenuation coefficient are changed with well depth,and different for different drilling fluid circulating times,especially in the lower section of wellbore.

关 键 词：随钻测量 深井钻井 数学模型 传播速度 衰减系数 

分 类 号：TE245[石油与天然气工程—油气井工程]