旋转导向钻井系统下行通讯接收功能的开发.pdf

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1、第31卷第1期石油学报VoI．31No．12010年1月ACTAPETROLEISINICAJan．2()10文章编号：02532697(2010)01—0157—04旋转导向钻井系统下行通讯接收功能的开发汤楠霍爱清汪跃龙程为彬(西安石油大学陕西省钻机控制技术重点实验室陕西西安710065)摘要：在旋转导向钻井系统中，导向控制命令是由地面监控装置通过系统的下行通讯通道向井下导向工具发送。用钻井液负脉冲的方式传输下传信号，采取了三降三升为主要特点的命令字脉宽编码方式。地面命令发送装置将指令转换成一定脉宽的钻井液排量变化，用5位指令

2、码表示相应的导向力级别和5-具面角。在井下导向工具中设计了下行通讯接收装置。由装置的数据采集部分检测反映钻井液脉冲变化的井下泥浆电机的输出电压或频率，经数据处理和解释，以信号阈值判断和脉宽识别为核心，由5个指令码的脉冲宽度时间和顺序计算得到正确的下传导向命令字。为了提高下行信号传输的可靠性和抗干扰能力，在接收装置的硬件和软件中采用了相应的措施。试验结果证明了这种下行通讯方案的可行性。关键词：旋转导向钻井系统；导向工具；下行通讯；钻井液脉冲；接收装置中图分类号：TE243文献标识码：ADevelopmentofdownwardco

3、mmunicationreceivingfunctioninrotarysteerabledrillingsystemTANGNanHUOAiqingWANGYuelongCHENGWeibin(ShaanxiKeyLaboratoryofDrillingRigControllingTechnique，Xi’anShiyouUniversity，Xi’an710065。China)Abstract：Intherotarysteerabledrillingsystem，thereisadownwardcommunicationch

4、anneltosendtheguidancecontrolcommandfromthegroundmonitortOthedownholesteeringtoo1．Thenegativepulseofdrillingfluidtransmitsadownwardcommandmodeencodedbythethreedescendingandthreeascendingwords．Acommandsendingdeviceonthegroundtransmitsthecommandmodeintoflowrateofdrilli

5、ngfluid，whichischangingwithacertainpulsewidthofdrillingfluid．Acontrolwordcomposedoffiveinstruc—tioncodesrepresentsthegradeofguidingforceandangleoftoolface．Thereisadownwardreceivingdeviceinthedown—holesteeringtoo1．Thedataacquisitionunitofthedevicecandetecttheoutputvol

6、tageorfrequencyofthedownholefluidmotorthatreflectsthepulseflowchangeofdrillingfluid．Thedataprocessingandinterpretationsoftwarebasedonsignalthresholdjudgmentandpulsewidthidentificationcanprocessthereceivedinformation．Thenarightguidingcontrolcommandcalculatedusingthepu

7、lsewidthandthesequenceofthe5codescouldbeobtained．Severaldifferentmeasureswereusedinthereceivingdeviceforimprovingthereliabilityandanti—interferenceperformanceofdownwardsignaltransmission．Experimentalresultsshowedthefeasibilityofthisdownwardtransmissionscheme．Keywords

8、：rotarysteerabledrillingsystem；steeringtool；downwardcommunication；drillingfluidpulse；receivingdevice旋转导向技术是一项涉及多学科多领域的现代钻工作方式和工作环境使