激发钻柱振动减小摩阻的机理与方法研究

Development of directional wells, horizontal wells and extended reach well to develope complex reservoirs, offshore oil and gas resources, in line with China's huge demand for energy.The effect of existing friction reduction methods is so limited that researching and developing new efficient friction reduction method is a necessary way to improve high friction well drilling efficiency, but also an important means to respond to the world's oil drilling market's fierce competition.This program aims the key scientific issues and key technical issues of drillstring friction reduction by vibration drilling method, systematically study the mechanism of friction reduction by vibration between drillstring and rocks by theoretical analysis,numerical method and experimental studies.This program aslo will establish drillstring friction reduction effect by vibration evaluation model, considering drillstring buckling,develope drillstring exciting tools,perfect drilling program,optimize the drilling process parameters and multi-point excitation BHA, and ultimately form an efficient, stable, reliable drillstring vibration friction reduction method of drilling.In addition, the mechanism of friction reduction by vibration between drillstring and rock material is a foundation research, the research results can be used to supplement and perfect the the friction reduction theory by vibration and guide the application of other industries' friction reduction by vibration.

发展定向井、水平井及大位移井技术开发复杂油气藏和海洋油气资源，符合我国对能源的巨大需求。由于现有钻柱减摩阻方法效果有限，研发新型高效的减摩阻方法，是提高这类高摩阻井钻探效率的必要途径，也是应对世界石油钻探市场激烈竞争的重要手段。本课题针对钻柱振动减摩阻钻井方法中的关键科学问题和关键技术问题，采用理论分析、数值模拟和实验研究相结合的方法，系统研究钻柱与岩石之间振动减摩阻机制，考虑钻柱屈曲，建立钻柱振动减摩阻效果评价模型，研制高效的钻柱激振工具，完善钻柱振动减摩阻钻井方案，优化钻井工艺参数体系及多点激励钻具组合，最终形成一种高效、稳定和可靠的钻柱振动减摩阻钻井方法。另外，钻柱与岩石材料振动减摩阻机制研究具有较强的基础性，其研究成果可用于补充完善钻柱振动减摩阻理论，并可指导其他行业振动减摩阻的应用。

研发新型高效减摩阻方法，提高复杂结构井的钻探效率，对提高复杂油气藏、海洋油气资源的开发效率以及保障我国对能源的巨大需求具有重要意义。通过激发钻柱振动从而减小钻柱与井壁之间摩阻，已成为该领域的一个研究热点。本课题针对钻柱振动减摩阻钻井方法中的关键科学和技术问题，开展了系统的研究，揭示了钻柱与岩石之间振动减摩阻机理、建立了考虑动摩阻下的钻柱载荷传递计算方法、研制了两种激振工具并开展了4口井的现场试验，减摩阻提速效果显著。上述研究成果为形成一种高效的、稳定的、可靠的钻柱振动减摩阻钻井方法奠定了理论基础，同时，振动条件下的摩擦副间摩擦系数计算方法可为其他利用振动控制摩擦力的工业领域提供借鉴。