随钻一体化测井仪平台开发

The Development of an Integrated Logging Instrument Platform while Drilling

为了满足多深度探测评价钻井液侵入和识别地层岩性的需要,开发了具有电阻率、伽马等多参数测量功能的随钻一体化测井仪平台。基于相移电阻率、衰减电阻率、总量伽马和成像伽马等测量方法,采用六发两收的八线圈系设计方案,挂接了伽马探管、加速度计和磁通门等传感器,同时采用了由发射电路、接收电路和控制电路组成的模块化电路设计方案,并定义了总线通讯协议,建立起了各功能模块之间的信息传递。开发了测井仪平台的固件程序,不仅能够测量相移电阻率和衰减电阻率数据,还能够测量伽马数据和地层方位信息;开发了平台测试软件,能够对仪器进行标定测试及下井前的启动设置,实现仪器控制指令的下发,测量数据的上传,并对电阻率、伽马、井斜角和工具面等数据进行监测和图形化处理。研制的随钻一体化测井仪平台可以为大斜度井和水平井钻井提供丰富的、高质量的测井数据,为地层评价提供所需要的数据,从而为非常规油气储层开发提供技术支持。

The goals were to detect characteristics of of multi-depth formations and evaluate mud intrusion as well as identify the formation lithology.To that end,researchers developed an integrated logging instrument platform while drilling capable of multi-parameter measurement such as resistivity and Gamma.According to the measurement methods like phase shift resistivity,attenuation resistivity,total Gamma and imaging Gamma,an eight-coil design(six senders and two receivers)was adopted,and the sensors such as Gamma probes,accelerometers,and fluxgates were attached.Meanwhile,the modular circuit design scheme consisting of transmitting circuit,receiving circuit and control circuit was applied.Researchers then defined the bus communication protocol to establish the information transmission among various functional modules.The firmware program for the logging instrument platform has been developed,which can not only measures the phase shift resistivity and attenuation resistivity data,but also measure the Gamma data and formation azimuth information.The test software for the platform has been developed to calibrate the instrument and enable the startup setting prior to running in hole,realize the issuing of control commands and upload the measurement data,and monitor and graphically process data such as resistivity,Gamma,inclination angle,and tool face.This integrated logging instrument platform could provide abundant high-quality logging data for high-angle well and horizontal well drilling,and acquire necessary data for formation evaluation,so as to provide technical support and best practices for the development of unconventional oil and gas reservoirs.