Check the precautions of screw drill and the structure of motor test bench

Screw drill has the characteristics of drilling, good drilling forming, large drilling torque, stable operation, automatic locking of spring pin, convenient disassembly and so on. When drilling deep holes, the drill pipe is equipped with a cotter pin to increase the transmission torque and reduce the loss of drill pipe. The plug-in screw connection is adopted, which has the characteristics of convenient disassembly, good sealing, tensile and pile forming. Good perpendicularity, easy to disassemble and install.

Spiral drill pipe is a product of spiral drilling tools. It is common in the process of oil and gas production and can be used for many times. Our requirement for spiral drill pipe is to have strong pressure bearing capacity and be able to twist, bend and vibrate freely. Generally, our common drill pipe can reach about 9m.

The common bottom of drill pipe is threaded steel pipe, also known as spiral drill pipe. The drill pipe is mainly used to connect the surface equipment of the drilling rig and the drilling and grinding equipment or bottom hole device at the bottom of the drilling rig. Our commonly used drill pipe is also commonly used in drilling. Drill pipes are also divided into many types, such as new coal drill pipes, water exploration drill pipes, air drill pipes, etc. according to different needs, different drill pipes can be provided to meet the needs of the industry.

Structure of screw drill motor test bench:

(1) The main engine is composed of water inlet connection assembly, clamping push assembly, roller seat frame and front and rear seat assembly. The water inlet connection assembly is composed of motor, reducer, coupling, water inlet connection mechanism and connecting sealing head. Provide driving force for motor test, provide passage for test water, realize connection with motor rotor, form seal with stator, and prevent relative axial movement of stator when rotor rotates. Therefore, the transmission is required to be stable and sealed, and the water in the water chamber does not enter the bearing seat, so as to ensure good bearing lubrication and long service life. Therefore, the water inlet sealing end adopts double sealing, and the leakage observation hole is set, so that it can be found and replaced in time after the seal is worn, and the water does not enter the bearing seat. The clamping and pushing assembly is composed of left and right calipers, clamping and pushing guide columns and pushing clamping bodies. The push hydraulic cylinder in the hydraulic system is connected to the push clamping body to clamp the push drill motor and overcome the reverse torque transmitted to the stator when the rotor rotates. Considering that the motor does not work continuously in the test, the clamping position of one end caliper is adjusted by screw pair, and the other end caliper is automatically clamped by the clamping hydraulic cylinder in the hydraulic system. This clamping method makes the clamping force directly act on the center of the drilling tool motor, and can also adapt to the ovality or local wear of the motor. The tong teeth of the caliper can be clamped evenly without slipping. There are 4 groups of roller seat frame, which is composed of seat body, frame body and roller. It is used to support the drilling tool motor and make it concentric with the center of the test bench. The roller is placed in different slot holes on the frame body to adapt to different specifications of drilling tool motors. The front and rear seat assemblies are used to fix the above components and provide reference for them, so that the whole machine is concentric. The utility model is mainly composed of a base, a power seat, a tong seat and a push cylinder seat.

(2) Waterway system the system is composed of filling pump, filling pipeline, drainage pipeline, pressure measuring instrument, control valve, etc. it provides water and water discharge path for drilling tool motor test. Small displacement injection is adopted, and the water and liquid in the system can be automatically recycled for supply or discharge, so as to meet the different requirements of different specifications of drilling tool motors for water supply.

(3) Hydraulic system the system is composed of clamping hydraulic cylinder, pushing hydraulic cylinder and hydraulic power supply part, which mainly provides power for clamping and pushing of drilling tool motor. The starting, clamping and pushing actions of the system are controlled by the electrical control system.

(4) Electrical control system and microcomputer system electrical control system is used for centralized control of main engine, waterway system and hydraulic system. The microcomputer system is used to collect, display and print the seal pressure difference of drilling tool motor, input and print the drilling tool number, small and large seal pressure difference of drilling tool motor, operator number and test date.

Precautions for inspection of screw drill:

1. Check screw drill

Before running in the well, it shall be confirmed that it is a new screw drill or a screw drill after normal maintenance. If it is not disassembled, inspected and maintained, it may contain potential accidents and bring unnecessary losses to drilling operations. If it is really necessary for the old screw drill to run in the well again, carefully check whether the thread part is loose and whether the shell of the screw drill is corroded or scratched. The threads of the new screw drill shell have been tightened and coated with locking agent when leaving the factory. No threaded part shall be rotated on the drill floor.

2. Install the drill bit

When installing the drill bit with the drill bit loader, the shaft head of the transmission shaft of the screw drill should be rotated with chain tongs, and can only be rotated counterclockwise (when viewed from the top), so as to prevent the internal thread from loosening

3. Check the opening and closing of the bypass valve

Lift the lifting nipple, put the screw drill into the rotary table, and place the bypass valve at an easily observable position above the rotary table. Clamp the screw drill with slip and remove the lifting nipple. Press down the valve core of the bypass valve with a hammer or wooden rod, and fill the bypass valve with water. At this time, the valve port of the bypass valve shall be watertight. Then remove the wooden rod, the valve core shall be rebounded and reset by the spring, and the injected water shall flow out evenly from each hole on the side, which can be considered normal.

4. Commissioning

Connect the upper drill pipe, and lower the screw drill under the rotary table with Kelly, so that the bypass valve is located below the rotary table for easy observation. Start the mud pump for mud circulation. After confirming that the bypass valve is closed, slowly lift the screw drill and observe whether the shaft head of the transmission shaft rotates (Note: small displacement shall be used during commissioning, and 3 ~ 7% of the mud shall leak from the shaft head under normal conditions). At this time, the bypass valve is in the "closed" position, and there should be no mud flowing out of the bypass hole. After confirming that the shaft head of the transmission shaft rotates normally, lower the drilling tool so that the bypass valve is below the rotary table, stop the pump, and observe whether the bypass valve is opened again to discharge the mud from the bypass valve hole. Before the pump is stopped, do not lift the bypass valve above the rotary table to prevent contamination of the well platform. During the test, observe the change of pump pressure and record the circulating pressure of screw drill under different displacement.