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Components of a screw drill

Time: 2022-04-11 16:06:58

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Screw drilling tool is a kind of drilling and milling tool commonly used in oil and water well workover. It is a tool that drives downhole drilling tools to rotate with hydraulic pressure as power. It

Components of a screw drill

Screw drilling tool is a kind of drilling and milling tool commonly used in oil and water well workover. It is a tool that drives downhole drilling tools to rotate with hydraulic pressure as power. It can be used for drilling, milling, sidetracking and other operations. On the one hand, the requirements for the well flushing fluid are relatively high. On the other hand, during construction on site, the screw drilling tool is easily damaged due to improper operation, which not only affects the construction progress, but also increases the operation cost. In order to improve the utilization rate of screw drilling tools, a brief explanation is made on its principle, operation method and failure analysis.

The structure of the screw drill

The screw drill is mainly composed of an upper joint, a bypass valve, a stator, a rotor, a water-passing joint, a bearing assembly and a lower joint.

1. The structure and function of the bypass valve

(1) Structure: The bypass valve is mainly composed of a body, a valve sleeve, a valve core, a spring, a spring retaining ring, a wire plug, and a sieve plate.

(2) Function: a. Prevent the rotor from turning upside down and loosening due to the high liquid density in the annular space when drilling down or connecting a single root. b. Prevent the well flushing fluid containing drill cuttings from entering the stator cavity and blocking the drilling tool. c. Prevent accidental blowout in drilling tools. d. The flushing fluid in the drill string can be drained out during tripping.

2. The structure and function of the motor assembly

(1) Structure: The motor assembly consists of a stator and a rotor. The stator is a rigid rubber sleeve with a double-ended or multi-ended spiral cavity vulcanized in a finished steel cylinder. The rotor is a single-head or multi-head helical steel shaft. After processing and forming with alloy steel, the surface is plated with a layer of hard chrome that is conducive to anti-corrosion and wear resistance, and the matching clearance between the stator and the rotor is controlled by chrome plating.

(2) Function: The hydraulic energy of the workover fluid pumped by the mud pump drives the rotor to rotate, providing rotating mechanical energy for the drill bit to break the rock. The motor assembly is the power source of the screw drilling tool.

3. Drive shaft assembly

The drive shaft assembly is one of the important parts of the screw drilling tool, and its life determines the overall life of the screw drilling tool. The drive shaft assembly is used to transmit WOB, torque and workover fluid.


Components of a screw drill
Screw drilling tool is a kind of drilling and milling tool commonly used in oil and water well workover. It is a tool that drives downhole drilling tools to rotate with hydraulic pressure as power. It
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