螺杆钻具使用手册.doc

1、Introduction
Shanghai Ocean Oilfield Service Co supplied Downhole Motor to Drilling Department of Bohai Offshore Oil Company LTD.(Tianjin), on base of mastering foreign and domestic advanced technology and linking China national situation, has developed and manufactured some types of screw drills in cooperation with oilfields and scientific research institutes. With them, we may provide satisfactory services to the oilfields.
This manual mainly introduces screw drill property, application and cautions, so as for the customers to know well our screw drills, and to do better selection, application, repair and maintenance of screw drill according to drilling demand. As a result, our screw drill may bring into play in its reliable technical function, to enhance drilling economic efficiency.
2、Principle
Screw drill is a kind of downhole dynamic drilling tool upon the power of drilling mud. Mud stream from the outlet of mud pump flows through a by-pass valve into the motor. This stream produces pressure loss at both inlet and outlet of the pump, to push the rotor into rotating, and to transmit the torque and speed onto the bit. The screw drill property mainly depends upon its property parameters
3、Constitution
Screw drill is composed of four assemblies of by-pass valve, motor, cardan shaft and drive shaft ( Fig. 1) .
前言
上海奥森油田服务有限公司为渤海石油有限公司（天津）钻井部提供螺杆钻具设备服务，与此同时联同各油田、科研院所，在消化国内外先进技术，结合我国国情的基础上，开发和制造出多种型号的螺杆钻具，能为油田提供满意服务。
本手册主要介绍螺杆钻具的性能和使用要求以及注意事项，便于用户更好地了解我公司的钻具，结合钻井的需要，选好、用好、维护好钻具，发挥其应有的技术性能，提高钻井经济效益。
2．螺杆钻具工作原理
螺杆钻具是以泥浆为动力的一种井下动力钻具。泥浆泵泵出的泥浆液流经旁通阀进入马达，在马达进出口处形成一定压差推动马达的转子旋转，并将扭矩和转速通过万向轴和传动轴传递给钻头。螺杆钻具的性能主要取决于螺杆马达的性能参数。
3．螺杆钻具的组成
螺杆钻具由旁通阀、马达、万向轴和传动轴四大总成组成（如图1）
By-pass Valve Assembly
It has two positions of by-pass and close (). It is in by-pass position during trip operation, circulates mud fluid in the drill string into the annular space by-passing the