The deviation control of directional drilling is essentially the controlling of two angles of the wellbore actually drilled, namely, the inclination and azimuth. In directional drilling the bit trajectory never coinci...The deviation control of directional drilling is essentially the controlling of two angles of the wellbore actually drilled, namely, the inclination and azimuth. In directional drilling the bit trajectory never coincides exactly with the planned path, which is usually a plane curve with straight, building, holding, and dropping sections in succession. The drilling direction is of course dependant on the direction of the resultant forces acting on the bit and it is quite a tough job to hit the optimum target at the hole bottom as required. The traditional passive methods for correcting the drilling path have not met the demand to improve the techniques of deviation control. A method for combining wellbore surveys to obtain a composite, more accurate well position relies on accepting the position of the well from the most accurate survey instrument used in a given section of the wellbore. The error in each position measurement is the sum of many independent root sources of error effects. The relationship between surveys and other influential factors is considered, along with an analysis of different points of view. The collaborative work describes, establishes a common starting point of wellbore position uncertainty model, definition of what constitutes an error model, mathematics of position uncertainty calculation and an error model for basic directional service.展开更多
基于连续油管的随钻测量系统采用7芯电缆作为传输媒介。井下仪器数据稳定、快速、有效传输对于随钻测量传输系统有着重要的作用。提出基于冗余结构的井下仪器互连传输总线协议。该总线协议基于CAN2.0总线协议,根据测井工程实际需要,利用...基于连续油管的随钻测量系统采用7芯电缆作为传输媒介。井下仪器数据稳定、快速、有效传输对于随钻测量传输系统有着重要的作用。提出基于冗余结构的井下仪器互连传输总线协议。该总线协议基于CAN2.0总线协议,根据测井工程实际需要,利用FPGA实现了总线控制器,并对操作模式、错误机制和仲裁机制进行改进。该方案利用Quartus II 8.1进行仿真,通过MATLAB将该方案与CAN总线的响应时间进行比较。该系统有较好稳定性和容错性能,符合仪器的高温高压环境和长时间稳定运行性能要求,能够建立高速稳定的数据传输系统。展开更多
文摘The deviation control of directional drilling is essentially the controlling of two angles of the wellbore actually drilled, namely, the inclination and azimuth. In directional drilling the bit trajectory never coincides exactly with the planned path, which is usually a plane curve with straight, building, holding, and dropping sections in succession. The drilling direction is of course dependant on the direction of the resultant forces acting on the bit and it is quite a tough job to hit the optimum target at the hole bottom as required. The traditional passive methods for correcting the drilling path have not met the demand to improve the techniques of deviation control. A method for combining wellbore surveys to obtain a composite, more accurate well position relies on accepting the position of the well from the most accurate survey instrument used in a given section of the wellbore. The error in each position measurement is the sum of many independent root sources of error effects. The relationship between surveys and other influential factors is considered, along with an analysis of different points of view. The collaborative work describes, establishes a common starting point of wellbore position uncertainty model, definition of what constitutes an error model, mathematics of position uncertainty calculation and an error model for basic directional service.
文摘基于连续油管的随钻测量系统采用7芯电缆作为传输媒介。井下仪器数据稳定、快速、有效传输对于随钻测量传输系统有着重要的作用。提出基于冗余结构的井下仪器互连传输总线协议。该总线协议基于CAN2.0总线协议,根据测井工程实际需要,利用FPGA实现了总线控制器,并对操作模式、错误机制和仲裁机制进行改进。该方案利用Quartus II 8.1进行仿真,通过MATLAB将该方案与CAN总线的响应时间进行比较。该系统有较好稳定性和容错性能,符合仪器的高温高压环境和长时间稳定运行性能要求,能够建立高速稳定的数据传输系统。
