摘要
随着国内深井、超深井钻探需求增加,连续波泥浆脉冲技术正向远距离、高速率方向发展。中海油服自主搭建了地面6000 m泥浆循环试验系统,由于测试仪器上游采用50.8 mm软管,管线压耗大且变径反射干扰严重,远距离高速率解码试验研究受限。针对此问题,基于试验系统建立了简化脉冲器-管线数值模型,研究50.8 mm软管对连续波信号的影响规律,并通过解码试验验证。研究结果表明:测试仪器上游50.8 mm软管与循环管线存在扩径,产生的反射波与发生波叠加导致波形畸变,且随着频率升高,发生波畸变越严重。50.8 mm软管内径小,管线沿程摩阻压降大,压力波的传输衰减程度高于等长的地下直管。50.8 mm软管换成101.6 mm软管,消除变径反射和降低沿程摩阻压降后,低频压力波波形改善,传输后幅值提高75%以上,有效降低了解码误码率。地面6000 m管线解码试验传输速率从6 bps提高至8 bps,验证了数值仿真分析结果。
In response to the growing demand for drilling deep and ultra-deep wells in China,continuous wave mud pulse technology is evolving in the direction of long distance and high speed.COSL has constructed a mud circulation experimental system with a depth of 6000 meters above ground.However,using a 50.8 mm hose upstream of the test instrument results in significant pipeline pressure loss and severe reflection interference due to diameter reduction.Consequently,the long-distance high-rate decoding experimental research is restricted.A simplified tool,namely a pipeline numerical model,has been established based on the experimental system to address this issue.This model has been employed to study the influence of the 50.8 mm hose on continuous wave signals and to verify the findings through decoding experiments.The results indicate that there is an enlargement of the 50.8 mm hose and circulating pipeline upstream of the test instrument,which results in waveform distortion due to the superposition of reflected waves and generated waves.The generated wave distortion becomes more pronounced with an increase in frequency.The inner diameter of the 50.8 mm hose is relatively small,the friction pressure drop along the pipeline is considerable,and the attenuation degree of pressure wave transmission is greater than that of an equal-length underground straight pipe.Following the replacement of the 50.8 mm hose with a 101.6 mm hose,the phenomenon of reducing reflection is eliminated,the friction pressure drop is reduced along the way,the low-frequency pressure wave shape is improved,the amplitude after transmission is increased by more than 75%,and the decoding bit error rate is effectively reduced.Finally,the experimental transmission rate of pipeline decoding at a height of 6000 meters above ground was increased from 6bps to 8bps,which corroborates the findings of the numerical simulation.superposition of reflected waves and generated waves.The generated wave distortion becomes more pronounced with an increase in frequency.The
作者
张良
王智明
韩虎
田博辉
ZHANG Lang;WANG Zhiming;HAN hu;TIAN Bohui(Welltech of China Oilfield Services Limited,Bejing 101149,China;School of Petroleum Engineering,Yangtze University,Wuhan 430100,China)
出处
《石油矿场机械》
CAS
2024年第5期6-14,共9页
Oil Field Equipment
基金
国家重点研发计划“大直径旋转导向钻井系统研制与应用示范”(SQ2017YFSF010105)。
关键词
深井
连续波泥浆脉冲
传输速率
2FSK
压力波畸变
数值仿真
deep well
continuous wave mud pulse
transmission rate
2FSK
pressure wave distortion
numerical simulation
