CN110374495A - A kind of high frequency circumferential direction impact type spiral drilling rig structure - Google Patents

Abstract

The invention provides a high-frequency circumferential impact screw drilling tool structure, which includes a bypass valve assembly, an anti-drop assembly, a motor assembly, a cardan shaft assembly, a drive shaft assembly and a circumferential impact assembly. The through valve assembly, the anti-drop assembly, the motor assembly, the universal shaft assembly, the drive shaft assembly, and the circumferential impact assembly are connected in sequence. The beneficial effects of the present invention are: the high-frequency circumferential impact screw drilling tool structure is used together with the PDC drill bit, which eliminates one or more vibrations (transverse, longitudinal and torsional) and sticking slip that may occur when the downhole drill bit moves. phenomenon, the torque of the entire drill string is kept stable and balanced to the drill bit. The rock breaking mechanism is mainly impact crushing, and high frequency rotation is applied to shear the rock formation, so as to achieve fast and stable drilling, improve drilling efficiency and save energy. drilling costs.

Description

A high-frequency circumferential impact screw drilling tool structure

technical field

The invention relates to the field of drilling tools for oil and natural gas exploitation, and more particularly to a high-frequency circumferential impact screw drilling tool structure.

Background technique

At present, the simple drill string or screw drilling tool combination only provides power to the drill bit, and cannot keep the torque of the entire drill string stable and balanced, and cannot make the power transmitted to the drill bit evenly and stably, and the movement of the PDC bit is extremely disordered. Including transverse, longitudinal and torsional vibrations and combinations of these vibrations. Downhole vibration can damage individual PDC cutters, reduce bit life, cause torque fluctuations that interfere with directional control and logging-while-drilling (LWD) signals, and produce irregular boreholes that reduce wellbore quality, thereby greatly reducing ROP and improving drilling cost.

SUMMARY OF THE INVENTION

The invention overcomes the deficiencies in the prior art, and provides a high-frequency circumferential impact screw drilling tool structure.

The purpose of the present invention is achieved through the following technical solutions.

A high-frequency circumferential impact screw drilling tool structure, comprising a bypass valve assembly, an anti-drop assembly, a motor assembly, a cardan shaft assembly, a drive shaft assembly and a circumferential impact assembly. The valve assembly, the anti-drop assembly, the motor assembly, the universal joint shaft assembly, the transmission shaft assembly, and the circumferential impact assembly are connected in sequence.

Further, the transmission shaft assembly includes a transmission shaft, an upper radial bearing, an upper bearing shell, a lower radial bearing, a lower bearing shell and a bearing, and the lower radial bearing, the lower bearing shell and the bearing are installed The upper end of the transmission shaft is connected with the upper bearing shell and the lower bearing shell, and is loaded into the upper radial bearing and tightened with the transmission shaft.

Further, the circumferential impact assembly includes a filter screen, an impact anvil, an impact hammer, a reversing shaft and a lower joint, and the filter screen, the impact anvil, the impact hammer, and the reversing shaft are installed in the Inside the lower end of the transmission shaft, the impact anvil is connected with the lower joint.

Further, the cardan shaft assembly includes a cardan shaft casing and a cardan shaft, the upper end of the transmission shaft is connected to the lower end of the cardan shaft, and the upper end of the upper bearing shell is connected to the lower end of the cardan shaft casing.

Further, the drop-proof assembly includes a drop-proof shell, a drop-proof mandrel, and a drop-proof nut, the drop-proof nut is connected to the upper end of the drop-proof mandrel, and the rotor upper end of the motor assembly is connected to the drop-proof nut. The lower end of the mandrel is connected, and the upper end of the stator of the motor assembly is connected with the lower end of the anti-fall housing.

Further, the bypass valve assembly includes a bypass valve casing, a valve core, a valve seat, a spring, a circlip, a filter sleeve, the valve core, the valve seat, the spring, the circlip, the The filter sleeve is inserted into the bypass valve casing, and the lower end of the bypass valve casing is connected with the upper end of the anti-drop casing.

The beneficial effects of the present invention are:

The structure of the high-frequency circumferential impact screw drilling tool is composed of bypass valve assembly, anti-drop assembly, motor assembly, universal shaft assembly, drive shaft assembly, and circumferential impact assembly; drilling fluid high-pressure mud flows through Bypass valve, anti-drop, motor, cardan shaft, and drive shaft generate pure mechanical kinetic energy, and then enter the circumferential impact part through high-pressure mud. There is a mud flow distributor inside the circumferential impact, which will have 200-400 horsepower. Massive power mud is dispensed into the tubular tool. The huge energy from the mud makes the two power parts of the impact hammer in the tool reverse each other, producing a uniform and constant high-frequency impact force in the circumferential direction. Used together, and concentrated and evenly given to the entire drill bit body, eliminating one or more vibrations (transverse, longitudinal and torsional) that may occur when the downhole drill bit moves, so that the torque of the entire drill string remains stable and balanced , its rock breaking mechanism is mainly impact crushing, and high-frequency rotation shears the rock formation, the main function is to protect the drill bit while ensuring the quality of the wellbore, prolong the service life of the drill bit, and eliminate the danger caused by stick-slip; The kinetic energy is converted into torsional high-frequency impact energy and transmitted to the PDC bit, which greatly improves the ROP in medium-hard and extra-hard rock layers; increases the stability of the PDC bit and eliminates errors and failures during directional operations. ; Reduce the failure of the motor due to uneven high torque; save huge drilling costs and drilling time, and improve drilling efficiency.

Description of drawings

Fig. 1 is the structural representation of the present invention;

In the picture:

1. Bypass valve assembly; 2. Anti-drop assembly; 3. Motor assembly; 4. Cardan shaft assembly;

5. Drive shaft assembly; 6. Circumferential impact assembly; 7. Impact hammer; 8. Impact anvil.

Detailed ways

The technical solutions of the present invention will be further described below through specific embodiments.

As shown in Figure 1, a high-frequency circumferential impact screw drilling tool structure includes a bypass valve assembly 1, an anti-drop assembly 2, a motor assembly 3, a cardan shaft assembly 4, a drive shaft assembly 5 and Circumferential shock assembly 6, bypass valve assembly 1, anti-drop assembly 2, motor assembly 3, universal shaft assembly 4, drive shaft assembly 5, and circumferential shock assembly 6 are connected in sequence.

The transmission shaft assembly includes a transmission shaft, an upper radial bearing, an upper bearing shell, a lower radial bearing, a lower bearing shell and a bearing, and the lower radial bearing, the lower bearing shell and the bearing are installed in the The upper end of the transmission shaft is connected with the upper bearing shell and the lower bearing shell, and is loaded into the upper radial bearing and tightened with the transmission shaft.

The circumferential impact assembly includes a filter screen, an impact anvil 8, an impact hammer 7, a reversing shaft and a lower joint. The filter screen, the impact anvil 8, the impact hammer 7, and the reversing shaft are installed in the Inside the lower end of the transmission shaft, the impact anvil is connected with the lower joint.

The universal joint shaft assembly includes a universal joint shaft housing and a universal joint shaft, the upper end of the transmission shaft is connected with the lower end of the universal joint shaft, and the upper end of the upper bearing shell is connected with the lower end of the universal joint shaft housing.

The drop-proof assembly includes a drop-proof shell, a drop-proof mandrel, and a drop-proof nut, the drop-proof nut is connected to the upper end of the drop-proof mandrel, and the rotor upper end of the motor assembly is connected to the drop-proof mandrel. The lower end is connected, and the upper end of the stator of the motor assembly is connected with the lower end of the anti-fall housing.

The bypass valve assembly includes a bypass valve casing, a valve core, a valve seat, a spring, a circlip, and a filter sleeve. The valve core, the valve seat, the spring, the circlip, and the filter sleeve into the casing of the bypass valve, and the lower end of the casing of the bypass valve is connected with the upper end of the anti-drop casing.

Working method: After the drilling fluid enters the bypass valve assembly 1 from the drill pipe, the valve core is closed, and then the drilling fluid enters the anti-drop assembly, and enters the motor assembly 3 from the anti-drop assembly 2, forming a certain amount at the inlet and outlet of the motor. The pressure difference drives the rotor of the motor to rotate, generating torque and rotational speed. The torque and rotational speed are transmitted through the universal joint shaft assembly 4 and the drive shaft assembly 5. The drilling fluid enters the circumferential impact assembly 6 through the drive shaft, and the huge energy of the mud The two power parts of the impact hammer 7 in the tool are reversed with each other to generate a uniform and constant high-frequency impact force in the circumferential direction, and the frequency reaches 750-1500 times per minute. The torque, rotational speed and high-frequency impact force generated by the circumferential impact assembly are generated by the motor part and used together with the PDC bit, and are concentrated and evenly distributed to the entire bit body, eliminating one or more possible occurrences during the downhole bit movement. It is a phenomenon of vibration (transverse, longitudinal and torsional), which keeps the torque of the whole drill string stable and balanced, and applies high-frequency rotation to shear the rock formation.

An embodiment of the present invention has been described in detail above, but the content is only a preferred embodiment of the present invention, and cannot be considered to limit the scope of the present invention. All equivalent changes and improvements made according to the scope of the application of the present invention should still belong to the scope of the patent of the present invention.

Claims (6)

1. A high-frequency circumferential impact screw drilling tool structure is characterized in that: it comprises a bypass valve assembly, an anti-drop assembly, a motor assembly, a cardan shaft assembly, a drive shaft assembly and a circumferential impact assembly. The bypass valve assembly, the anti-drop assembly, the motor assembly, the universal joint shaft assembly, the transmission shaft assembly, and the circumferential impact assembly are connected in sequence. 2. The high-frequency circumferential impact screw drilling tool structure according to claim 1, wherein the drive shaft assembly comprises a drive shaft, an upper radial bearing, an upper bearing shell, a lower radial bearing, and a lower bearing Shell and bearing, the lower radial bearing, the lower bearing shell and the bearing are installed into the upper end of the transmission shaft, the upper bearing shell is connected with the lower bearing shell, and the upper radial bearing is installed And tighten with the drive shaft. 3. The high-frequency circumferential impact screw drilling tool structure according to claim 2, wherein the circumferential impact assembly comprises a filter screen, an impact anvil, an impact hammer, a reversing shaft and a lower joint, and the The filter screen, the impact anvil, the impact hammer, and the reversing shaft are installed inside the lower end of the transmission shaft, and the impact anvil is connected to the lower joint. 4 . The high-frequency circumferential impact screw drilling tool structure according to claim 3 , wherein the cardan shaft assembly comprises a cardan shaft housing and a cardan shaft, and the upper end of the transmission shaft is connected to the cardan shaft. 5 . are connected to the lower end of the shaft, and the upper end of the upper bearing shell is connected to the lower end of the universal shaft shell. 5. The high-frequency circumferential impact screw drilling tool structure according to claim 4, wherein the anti-drop assembly comprises a drop-proof casing, a drop-proof mandrel, and a drop-proof nut, and the drop-proof nut is connected to the drop-proof nut. The upper end of the anti-fall mandrel is connected, the upper end of the rotor of the motor assembly is connected to the lower end of the anti-fall mandrel, and the upper end of the stator of the motor assembly is connected to the lower end of the anti-fall shell. 6 . The high-frequency circumferential impact screw drilling tool structure according to claim 5 , wherein the bypass valve assembly comprises a bypass valve casing, a valve core, a valve seat, a spring, a circlip, and a filter sleeve. 7 . The valve core, the valve seat, the spring, the circlip, and the filter sleeve are inserted into the bypass valve casing, and the lower end of the bypass valve casing is connected to the upper end of the anti-drop casing.