气体钻井微波中继传输随钻测量系统研究

STUDY ON MICROWAVE-RELAYED MEASUREMENT-WHILE-DRILLING SYSTEM FOR GAS DRILLING

气体钻井由于能有效地保护低压油气层、解决恶性井漏、提高机械钻速而得到了广泛应用。现场资料表明,气体钻井比常规钻井液钻井井斜的概率更高,但因缺乏有效的井眼轨迹随钻测量系统,导致目前气体钻井常采用盲钻的方式,不仅难以准确的获知钻头位置,也在一定程度上限制了其在定向井、水平井等钻探现场的应用。因此现场急需一种适用于气体钻井的井眼轨迹随钻实时监测方法。文章设计的井眼轨迹随钻实时监测系统,通过微波中继器实时上传井斜角、方位信息,大幅提高气体钻井随钻监测技术水平,具有现场指导意义。

Since gas drilling can effectively protect the lowpressure reservoirs,solve the serious lost circulations,differential sticking and improve ROP,it has been applied widely. The field data show that gas drilling more tends to cause well deflection than conventional drilling fluid drilling. And due to the lack of proper trajectory measurement-while-drilling system,the gas drilling often adopts a kind of blind drilling,not able to accurately locate the bits and having restricted its application in ER wells,directional wells,and horizontal wells. So a suitable well trajectory measurement-while-drilling method for gas drilling operations is required. The real-time measurement method design introduced in this paper can transmit the well inclination and azimuth information up to the ground in real time though addition of microwave relays to calculate the well coordinates downhole. It will highly improve the measurement-while-gas drilling to a high level,providing a guide for drilling engineering on site.