Twist stabilizing nipple of screw drill

Abstract

The utility model belongs to the technical field of screw drilling tools, and particularly relates to a screw drilling tool torsion stabilizing nipple which comprises an upper connector, an upper shell, a spiral spline sleeve, a lower sealing shell, a spiral spline shaft, a disc spring guide rod, a sealing piston, a disc spring, a guide ring and an oil scraping ring. The other end of the upper shell is in threaded connection with one end of the spiral spline sleeve, the other end of the spiral spline sleeve is in threaded connection with the lower sealing shell, the spiral spline shaft is matched with threads in the spiral spline sleeve, and one end of the spiral spline shaft is in threaded connection with one end of the disc spring guide rod. The disc spring is sleeved on the disc spring guide rod and clamped on a step table of the disc spring guide rod, the other end of the disc spring is in contact fit with a boss on the inner side of the upper shell, and the sealing piston is sleeved at the other end of the disc spring guide rod. The stable torque nipple tool of the screw drill adopts a pure mechanical structure, and is simple and ingenious in structure, easy to operate, high in applicability and high in cost performance.

Description

Technical Field

[0001] The utility model belongs to the technical field of screw drill tools, and in particular relates to a torsion stabilizing short section of a screw drill tool. Background Art

[0002] Screw drill bits have become an indispensable drilling tool in drilling operations. They play an especially important role in special processes such as directional wells, horizontal wells, and extended reach wells in petroleum, geological exploration, geothermal wells, and coalbed methane mining. Screw drill bits used in oil exploration are generally composed of a bypass valve assembly, an anti-drop assembly, a motor assembly, a universal shaft assembly, and a transmission shaft. The function of the universal shaft assembly is to convert the torque generated by the planetary motion of the motor rotor into a fixed shaft torque, and to smoothly transmit the torque and speed generated by the motor to the drill bits used for drilling. With the continuous strengthening of drilling parameters for energy geological exploration (the drilling pressure has increased by more than 1.5 times, and the displacement has also increased relatively), the output performance of the screw drill bit motor has also been continuously improved with the strengthening of drilling parameters; in the process of high drilling pressure and large displacement drilling, the screw drill bit and the drill bit may occasionally experience drilling jump, drilling stop, drilling stagnation, stick-slip of the drill string, radial and axial vibration, etc., which will cause the screw drill bit to be disengaged, the body to break, the motor to break, the string bearing to break, and other failures. Utility Model Content

[0003] The utility model aims to provide a torsion stabilizing short section for a screw drill to solve the problems existing in the prior art.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a screw drill torque stabilizing short section, comprising an upper joint, an upper shell, a spiral spline sleeve, a lower sealing shell, a spiral spline shaft, a disc spring guide rod, a sealing piston, a disc spring, a guide ring and an oil scraper ring, the upper joint is threadedly connected to one end of the upper shell, the other end of the upper shell is threadedly connected to one end of the spiral spline sleeve, the other end of the threaded spline sleeve is threadedly connected to the lower sealing shell, the spiral spline shaft cooperates with the threads inside the spiral spline sleeve, one end of the spiral spline shaft is threadedly connected to one end of the disc spring guide rod, the disc spring is sleeved on the disc spring guide rod and stuck on the stepped platform of the disc spring guide rod, the other end of the disc spring is in contact and cooperates with the boss on the inner side of the upper shell, and the sealing piston is sleeved on the other end of the disc spring guide rod.

[0005] Preferably, a first oil filling hole is provided on the upper shell body, the first oil filling hole is located between the disc spring and the sealing piston, and a plug is installed on the first oil filling hole.

[0006] Preferably, a second oil filling hole is provided on the lower sealing shell, the second oil filling hole is located at a threaded position on the helical spline shaft, and a plug is installed on the second oil filling hole.

[0007] Preferably, an oil scraper ring is provided on the lower sealing housing.

[0008] Preferably, a first PIP type sealing ring is provided at the inner side of the oil scraper ring.

[0009] Preferably, a first O-ring is provided between the upper joint and the upper shell.

[0010] Preferably, a second PIP type seal and a B type seal ring are provided around the sealing piston.

[0011] Preferably, a second O-ring is provided between the upper shell and the helical spline sleeve.

[0012] Preferably, a third O-ring is provided between the helical spline shaft and the disc spring guide rod.

[0013] The beneficial effects of the utility model are: the screw drill torque stabilizing short section tool adopts a purely mechanical structure, which is simple and ingenious in structure, easy to operate, highly applicable, and cost-effective. Overall, it has the following advantages and characteristics:

[0014] 1. By adjusting the pre-compression of the disc spring, the weight of the lower drilling tool can be balanced to achieve a soft landing of the screw drilling tool, drill bit and drilling equipment;

[0015] 2. Reduce the stick-slip effect and drill bit stall caused by complex formations;

[0016] 3. Reduce the phenomenon of drilling and drilling jump when the drill bit encounters the formation, and increase the service life of the drill bit;

[0017] 4. The main key seals adopt oil bath sealing mechanism, which increases the service life of the seals and the compression-twist conversion mechanism;

[0018] 5. Reduce the vibration of downhole tools and increase the service life of downhole tool strings such as screw drilling tools, MWD / LWD, rotary guide tools, etc.;

[0019] 6. Reduce the axial and radial vibration of the drill and increase the service life of the drill;

[0020] 7. Improve the stability of signal transmission of measurement while drilling instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a structural schematic diagram of the upper half of the utility model;

[0023] Figure 3 It is a structural schematic diagram of the lower half of the utility model;.

[0024] In the figure, 1. upper joint, 2. upper shell, 3. spiral spline sleeve, 4. lower sealing shell, 5. spiral spline shaft, 6. disc spring guide rod, 7. sealing piston, 8. disc spring, 9. guide ring, 10. first PIP type sealing ring, 11. oil scraper ring, 12. first O-ring, 13. second O-ring, 14. second PIP type sealing ring, 15. B-type sealing ring, 16. plugging, 17. third O-ring. DETAILED DESCRIPTION

[0025] The specific implementation of the utility model is described in detail below with reference to the accompanying drawings and preferred embodiments.

[0026] like Figure 1-3 As shown, a screw drill torque stabilizing short section is mainly composed of a compression-torque conversion mechanism, an energy storage mechanism and a sealing oil bath mechanism. The helical spline sleeve and the multi-thread on the lower sealing shell form the compression-torque conversion mechanism, which plays a role in converting drilling pressure and torque. The disc spring group forms the energy storage mechanism, which plays a role in storing and releasing energy. The sealing piston, the helical spline shaft and the lower sealing shell form the sealing mechanism, which plays a role in sealing the anti-wear hydraulic oil and ensuring that the multi-thread works in a clean and lubricated environment. Specifically, it includes an upper joint 1, an upper shell 2, a helical spline sleeve 3, a lower sealing shell 4, a helical spline shaft 5, a disc spring guide rod 6, a sealing piston 7, a disc spring 8, a guide ring 9 and an oil scraper ring 11. The upper joint is threadedly connected to one end of the upper shell, the other end of the upper shell is threadedly connected to one end of the helical spline sleeve, the other end of the threaded spline sleeve is threadedly connected to the lower sealing shell, the helical spline shaft is matched with the thread inside the helical spline sleeve, one end of the helical spline shaft is threadedly connected to one end of the disc spring guide rod, the disc spring is sleeved on the disc spring guide rod and stuck on the stepped platform of the disc spring guide rod, the other end of the disc spring is in contact with the boss inside the upper shell, and the sealing piston is sleeved on the other end of the disc spring guide rod. A first oil filling hole is provided on the upper shell, the first oil filling hole is located between the disc spring and the sealing piston, and a plug is installed on the first oil filling hole. When the PDC drill bit is connected to the lower drill bit to be protected, the weight of the lower drill bit can be balanced by adjusting the compression of the disc spring group, so as to achieve a soft landing of the while-drilling measurement instrument, screw drill bit and drill bit. In addition, when the PDC drill bit encounters hard formations or soft and hard alternating formations, the torque fluctuation on the drill bit is large and the drill bit bounce phenomenon is serious, which will not only shorten the service life of the PDC drill bit, but also easily lead to the breakage of the downhole screw drill bit, affecting the mechanical drilling speed.

[0027] Furthermore, an oil scraper 11 is provided on the lower sealing housing, and a first PIP type sealing ring 10 is provided at the inner side of the oil scraper ring. A first O-ring 12 is provided between the upper joint and the upper housing. A second O-ring 13 is provided between the upper housing and the helical spline sleeve. A second PIP type sealing ring 14 and a B-type sealing ring 15 are provided around the sealing piston. A third O-ring 17 is provided between the helical spline shaft and the disc spring guide rod. A second oil filling hole is provided on the lower sealing housing, and the second oil filling hole is located at a threaded position on the helical spline shaft, and a plug 16 is installed on the second oil filling hole.

[0028] Install the second PIP type sealing ring 14 and the B type sealing ring 15 into the sealing piston 7; install the first PIP type sealing ring 10 and the oil scraper ring 11 into the lower sealing housing 4; install the first O-ring 12 and the second O-ring 13 into the thread groove of the spiral spline sleeve 3, install the third O-ring 17 into the spiral spline shaft 5, and install the second O-ring 13 into the thread groove of the upper joint 1; install the lower sealing housing 4 onto the spiral spline shaft 5, continue to insert the spiral spline sleeve 3 onto the spiral spline shaft 5, tighten the connecting thread of the spiral spline sleeve 3 and the lower sealing housing 4, connect the disc spring guide rod 6 to the spiral spline shaft 5, tighten it with the set screws, string the disc spring 8 into the disc spring guide rod 6 in a three-fold and two-pair manner, insert the disc spring 8 into the upper housing 2, tighten it with the spiral spline sleeve 3, place the sealing piston 7 into the upper housing 2, and tighten the upper joint 1 with the upper housing 2;

[0029] After assembly, fill the transmission joint and spring joint with lubricating oil, and seal the oil filling hole with plug 16; after assembly, the axial stroke should be tested, and the tool should be required to rotate and move flexibly. After the 5th compression, keep it for 30 minutes and then release it. The deformation length is required not to exceed 5%.

[0030] The use of a torque-stabilizing short-section tool for screw drills can provide longitudinal and circumferential shock absorption. When drilling in hard formations or soft and hard interlaced formations, the torque-stabilizing short-section tool can actively adjust the bit cutting depth to provide a relatively stable torque for the screw and drill bit. When the drill bit speed decreases and the reverse torque increases rapidly (drill bit stalls), the excessive torque is converted into axial force, the disc spring group is compressed, energy is stored, the tool shrinks, and the cutting depth of the drill bit is reduced, thereby reducing the drilling pressure on the screw and drill bit; when the drill bit speed is normal, the energy stored in the tool will gradually be released. This process will continue to repeat during the drilling operation, automatically adjusting the fluctuation of the drilling torque, and playing the role of "peak elimination and valley filling". During the entire process, the drill bit remains in the rock formation and the drilling process will not be interrupted.

[0031] The above process reduces the torque fluctuation and achieves the balance of drilling torque. It also greatly reduces the vibration of the drill string at the bottom of the hole, thereby increasing the service life of the while-drilling measurement instrument, screw drill tools, and drill bits, and reducing the number of replacement times of screw drill tools and drill bits; relatively stable torque can also increase the mechanical drilling speed.

[0032] It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. A screw drill torsion stabilizing short section, characterized in that: It includes an upper joint, an upper shell, a helical spline sleeve, a lower sealing shell, a helical spline shaft, a disc spring guide rod, a sealing piston, a disc spring, a guide ring and an oil scraper ring. The upper joint is threadedly connected to one end of the upper shell, the other end of the upper shell is threadedly connected to one end of the helical spline sleeve, the other end of the helical spline sleeve is threadedly connected to the lower sealing shell, the helical spline shaft cooperates with the internal thread of the helical spline sleeve, one end of the helical spline shaft is threadedly connected to one end of the disc spring guide rod, the disc spring is sleeved on the disc spring guide rod and stuck on the stepped platform of the disc spring guide rod, the other end of the disc spring is in contact and cooperated with the boss on the inner side of the upper shell, and the sealing piston is sleeved on the other end of the disc spring guide rod.

2. The screw drill torsion stabilizing sub according to claim 1, characterized in that: The upper shell is provided with a first oil filling hole, the first oil filling hole is located between the disc spring and the sealing piston, and a plug is installed on the first oil filling hole.

3. The screw drill torsion stabilizing sub according to claim 1, characterized in that: The lower sealing shell is provided with a second oil filling hole, the second oil filling hole is located at the threaded position on the helical spline shaft, and a plug is installed on the second oil filling hole.

4. The screw drill torsion stabilizing sub according to claim 1, characterized in that: An oil scraper ring is arranged on the lower sealing housing.

5. The screw drill torsion stabilizing sub according to claim 4, characterized in that: A first PIP type sealing ring is provided at the inner side of the oil scraper ring.

6. The screw drill torsion stabilizing sub according to claim 1, characterized in that: A first O-ring is provided between the upper joint and the upper shell.

7. The screw drill torsion stabilizing sub according to claim 1, characterized in that: A second PIP type seal and a B type seal ring are arranged around the sealing piston.

8. The screw drill torsion stabilizing sub according to claim 1, characterized in that: A second O-ring is provided between the upper shell and the helical spline sleeve.

9. The screw drill torsion stabilizing sub according to claim 1, characterized in that: A third O-ring is provided between the spiral spline shaft and the disc spring guide rod.

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