复杂地质条件下复杂结构井的钻井优化方案研究

在复杂地质条件下钻复杂结构井及特殊工艺井时,在地质和工程方面存在许多不确定性因素和复杂性问题.随钻导向、实时优化、井下动态诊断及其集成技术是解决这些难题的有效途径,基于智能钻柱,提出了把上述三项技术集成为一个整体的集成化的SOD系统;应用智能钻柱及其相关配套技术能提高双向闭环信息传输速率达10⁴～10⁶bps,同时能从地面向井下输送10～25kW的电力.给出了智能化钻井“导向—优化—诊断”集成系统总体结构设计方案.该系统能使地质条件透明化,使钻井过程简化并能提高钻井效率,有利于精确控制井身轨迹,可随钻分析钻柱(尤其是底部钻具组合、钻井工具)的力学行为,能优化钻井过程,实时识别和处理井下异常工况,能降低钻井成本约20%.

Optimum drilling program for complex well under complex geological condition

There are many un-certainties and complex problems in the fields of geology and engineering for drilling complex well under complex geological condition.The steering drilling,real-time optimizing drilling and dynamic diagnosis techniques while drilling as well as the integration of above techniques are right ways for solving above problems.Based on the intelligent drill-string,an integrated steering-optimizing-diagnosis (SOD) system was proposed.The intelligent drill-string is an electric drill-string and can transport the parameters including more than 30 variables measured down-hole while drilling to surface control decision orders,or transport the orders to bottom hole at high rate about 10 4 bits to 10 6 bits per second.It also can simultaneously transmit electrical power from 10 to 250 kW as required to down-hole soft and hardware.The structural diagram of SOD system was given,and the functions of this system were described.This system can make the geological un-certain parameters clear and simplify the drilling process.The SOD system also can be used to analyze the mechanical behaviors of drill strings (especial BHA and drilling-tool) and preciously control hole's trajectory while drilling.The drilling process can be optimized,and the drilling effectiveness can be improved in application of the system.This system can be used to real-timely recognize and treat down-hole abnormalities.The drilling cost will be reduced by 20 percent in application of this system.