CN219158903U - Screw drilling tool of device for preventing oil drilling bit from being balled - Google Patents

Abstract

The utility model relates to the technical field of drilling tools, in particular to a screw drilling tool for preventing oil drilling drill bits from pulsating, including an inner sleeve and an outer sleeve. One end of the inner sleeve is connected to the cardan shaft, and the other end is connected to the transmission shaft. The outer sleeve is sleeved on the outside of the inner sleeve and slidably fitted with it. The outer sleeve is fixed on the universal shaft shell The inner side of the body, the circumferential direction of the jacket is provided with strip grooves. The device is installed on the cardan shaft assembly of the screw drilling tool, so that the mud can be output in the form of pulses. Through the structural design, the water pressure changes repeatedly during the operation process, and an intermittent impact force is generated when the drill bit is flushed to achieve improvement. The purpose of cleaning effect.

Description

Screw drilling tool for preventing oil drilling drill bit ball pulse device

technical field

The utility model relates to the technical field of drilling tools, in particular to a screw drilling tool which prevents oil drilling drill bits from pulsating.

Background technique

Screw drilling tools are necessary power tools in the oil drilling industry. By connecting drill bits (roller cone bits, PDC bits or composite drill bits, etc.) to form a drilling and production combination, screw drilling tools are also called volumetric motors or mud motors. The flow in the cavity drives the helical rotor to rotate to generate speed and torque, and then drives the connected cardan shaft, transmission shaft and the end drill bit to rotate, and drills into the formation under certain drilling pressure and steering control to reach the oil layer . The mud is driven by the motor of the screw drilling tool to move the motor, then the mud passes through the cardan shaft assembly, the transmission shaft assembly, and finally is discharged from the water hole of the drill bit, and reaches the bottom of the well with the cuttings produced after drilling through the screw and the well. The annulus between the walls returns to the ground, the mud is recovered by the collection device, and then the bottom hole cuttings contained in the mud are filtered out by the filter device to complete the circulation of the mud. Reciprocating in this way, the operation of drilling oil or natural gas is completed.

In the drilling and production process, the problem of mud balling of the drill bit is a problem that has to be considered and avoided in the drilling and production process. Due to the composition of the formation and the selection or design of the drilling-production combination, the probability of occurrence of mud balls is greater or less. But as long as the drilling efficiency and the drilling speed will be greatly reduced as long as the mud bag occurs.

In general, when the mud is discharged through the water hole of the drill bit, it still has a certain pressure, which plays the role of cleaning the bottom of the well, taking away cuttings and cleaning the drill bit. When the cleaning ability is limited, the cuttings will be wrapped on the surface of the drill bit to form a mud bag, covering the cemented carbide teeth of the roller cone bit, or the diamond slices of the diamond drill bit will be covered by the mud bag, resulting in no or very slow drilling footage .

Utility model content

In order to effectively solve the problems in the above-mentioned background technology, the utility model proposes a screw drilling tool which prevents oil drilling drill bits from pulsating.

The specific technical scheme is as follows:

A screw drilling tool for preventing oil drilling drill bits from pulsating, including an inner sleeve and an outer sleeve. A central hole is provided in the center of the inner sleeve, and diversion holes communicated with the central hole are arranged around the inner sleeve. One end is connected with the universal joint shaft, and the other end is connected with the transmission shaft. The outer sleeve is fitted on the outside of the inner sleeve and slidably fitted with it. The outer sleeve is fixed on the inner side of the universal joint shaft housing. The circumferential direction of the outer sleeve is set There are bar grooves.

Preferably, the number of the strip grooves is the same as the number of the guide holes.

Preferably, there are three guide holes, and three bar-shaped grooves are provided in the circumferential direction of the jacket.

Preferably, the number of the guide holes is 3-6, and the number of the strip grooves is 3-6.

Preferably, the strip-shaped groove is elongated or sinusoidal or parabolic.

Preferably, a radial bearing is provided between the cardan shaft housing and the inner sleeve.

Preferably, one side of the radial bearing is connected to the casing, and the other side of the radial bearing is provided with a positioning sleeve.

Compared with the prior art, the beneficial effect of the utility model is: the device is installed on the cardan shaft assembly of the screw drilling tool, so that the mud can be output in the form of pulses, and the structural design makes the water pressure change repeatedly during the operation process , to produce an intermittent impact force when rinsing the drill bit, so as to improve the cleaning effect.

Description of drawings

Fig. 1 is the front view of prior art;

Fig. 2 is the front view of inner cover;

Figure 3 is a side view of the inner sleeve;

Fig. 4 is the front view of coat;

Figure 5 is a side view of the jacket;

Fig. 6 is the assembly diagram of inner cover and outer cover;

Fig. 7 is the front view of the coat with 5 strip grooves;

Fig. 8 is a side view of Fig. 7;

Fig. 9 is the assembly front view of Fig. 7;

Figure 10 is an assembled side view of Figure 7;

Fig. 11 is the front view that the strip grass is a curve;

Figure 12 is a side view of Figure 11;

Fig. 13-Fig. 15 changes the quantity, the height and the linear diagram of the bar groove for the coat;

Fig. 16-Fig. 18 is the side view of Fig. 13-Fig. 15;

Figure 19 is a position diagram of different bar-shaped grooves corresponding to the diversion holes;

Fig. 20-Fig. 23 are the jacket diagrams of bar grooves of different shapes;

Figures 24-27 are schematic diagrams of diversion holes corresponding to strip grooves of different shapes;

Fig. 28 is a structural schematic diagram of adding radial bearings.

Detailed ways

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations". Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be oriented differently, rotated 90 degrees, or at other orientations, and the spatially relative descriptions used herein interpreted accordingly.

The specific implementation of the utility model will be described in detail below in conjunction with the accompanying drawings and preferred embodiments. As shown in Figure 1-6, a screw drilling tool for preventing oil drilling and production drill bits from pulsating, including an inner sleeve 1 and an outer sleeve 2, the center of the inner sleeve is provided with a central hole 3, and the surrounding is provided with a central hole. Connected guide hole 4, one end of the inner sleeve is connected with the cardan shaft 5, and the other end is connected with the transmission shaft 6, the outer sleeve is sleeved on the outside of the inner sleeve and slidably matched with it, and the outer sleeve is fixed on the universal shaft Toward the inner side of the shaft housing 7, a bar-shaped groove 8 is provided in the circumferential direction of the outer casing. The inner sleeve can be a traditional diversion cap structure, or some specially designed structure. The outer sleeve can be designed to produce different pulse frequencies according to the rotation speed of the motor through some special designs.

In Figure 1, the universal shaft will flow into the mud from the motor assembly, then enter the diversion hole in the inner sleeve in the above figure, then enter the center hole of the inner sleeve, then flow into the center hole of the drive shaft connected to it, and finally enter the drill bit. Drain into the bottom of the well through the water hole.

The mud flows into the diversion hole, then enters the center hole, and then flows into the center hole of the transmission shaft from the center hole. The outer cover is fixed to the housing, and the inner cover follows the cardan shaft and drives the transmission shaft to rotate relative to the outer cover.

Taking the conventional structure as an example, the jacket in the above picture is a fixed part, which is fixed with the cardan shaft housing and can be fixed in many ways. Installed inside the curved shell, or through some metal-cured strong adhesives, such as epoxy glue or some anaerobic adhesives, such as Henkel Loctite's 680 anaerobic adhesive, in short, the jacket and the shell are integrated without relative movement .

As shown in Fig. 4 and Fig. 5, there are 3 diversion holes in the inner sleeve, and 3 grooves in the circumferential direction in the outer sleeve.

The inner sleeve is connected with the cardan shaft and the transmission shaft. The 3 holes in the inner sleeve match the positions of the 3 grooves in the outer sleeve. During actual drilling, the inner sleeve rotates in the outer sleeve with the universal joint shaft. When the holes of the inner sleeve pass through the outer sleeve When the mud flows into the space, the mud will release the pressure and enter the diversion hole, enter the center hole of the transmission shaft through the center hole of the inner sleeve, and then enter the drill bit to wash the drill bit. When the hole of the inner sleeve and the groove of the outer sleeve When the shielding walls between the grooves coincide, there is no space for the mud to flow in or the space for the inflow is very limited. The mud is pressurized at this position, and the position of the water hole of the drill bit stops flushing. When the hole in the inner sleeve meets the groove in the outer sleeve again When coincident, the mud is depressurized again, and the impact force generated by the pressure difference is used to flush the drill bit. Therefore, every inner sleeve/3 revolutions, the mud will be sprayed once, and the drill bit will be cleaned by pulses with a frequency of 3 times/revolution.

The main principle is to complete the pressurization and pressure relief through the relative movement of the inner sleeve and the outer sleeve, and the pulse power of intermittent flushing occurs during flushing. Of course, the structure is not fixed. For example, in order to meet different frequencies, the three holes in the inner sleeve can form different pulse effects through asymmetry. Similarly, the pulse type can also be shaped by the asymmetry of the groove in the jacket.

Furthermore, the pulse frequency can be controlled by changing the number of holes in the inner sleeve, as shown in Figure 9-15, for example, the 4 holes of the inner sleeve match the 4 slots of the outer sleeve. Or as shown in the picture below, there are 5 holes in the inner sleeve and 5 slots in the outer sleeve. Or there are 3 holes in the inner cover and 5 slots in the outer cover, depending on the needs of the design.

It is also possible to control the pressure change and flow change by changing the depth of the groove and the shielding wall. For example, when the shielding wall of the outer jacket intersects the diversion hole of the inner jacket, half of the hole is blocked. Compared with the full shielding, the pressurization will be relatively small. But there is still a certain amount of mud flow.

Or when the pressure is increased or the pressure is released, the performance is gradually increased and released, such as changing the line shape of the groove, such as making it into a shape such as a sinusoidal curve or a parabola, and the diversion hole of the inner sleeve is connected with the curved shielding wall of the outer sleeve. In the process of cutting to intersection, the pressure boost and cutoff are gradually and periodically changed.

Of course, the groove depth, the height of the curve, and the number of curved grooves, as shown in Figure 20-Figure 27, the amplitude and period of the mathematical meaning can be designed according to the water pressure gradient requirements and flushing requirements to be achieved, and the same The number and height of curved grooves can also be designed and adjusted according to needs, and will not be described one by one, and are not limited to these curves or designed forms, and can be processed according to needs.

In Fig. 20-Fig. 27, the diversion holes of the inner sleeve and the multiple curves are some examples of various situations of the shielding wall of the outer sleeve. Of course, they are not limited to these curves, and can be designed and adjusted according to needs.

In terms of mechanics, the rotor makes planetary rotation around the inner hole of the motor, which is converted into centering rotation through the cardan shaft (the upper end of the cardan shaft is planetary rotation, and the lower end is centering rotation. The cardan shaft is equivalent to a hinge, and planetary motion is converted into fixed rotation. During the centering movement, there will also be a certain range of radial force near the centering movement), and there is still a radial component force on the small end screw of the transmission shaft to form a certain bending moment during the conversion process. Long-term movement, the thread of the transmission shaft is prone to fatigue and cracking. When the outer sleeve is installed, the inner sleeve is connected to the lower half of the cardan shaft. When radial component occurs, the inner sleeve and the outer sleeve are slidingly fitted due to time. The outer sleeve has a supporting effect on the radial force of the inner sleeve, thereby reducing the radial component force generated by the conversion of motion when the inner sleeve is connected with the transmission shaft, reducing the bending moment on the transmission shaft, and prolonging the life of the transmission shaft .

Therefore, another function of this structure is to limit the radial swing of the lower end of the Vientiane shaft.

Of course, due to the sliding fit between the inner sleeve and the outer sleeve, it is inevitable to rub against each other. According to the needs, wear-resistant treatment can be done between the inner sleeve and the outer sleeve, as shown in Figure 28. It is common to weld certain wear-resistant materials, such as Plasma welding or laser cladding surfacing is used, followed by grinding to control the fit size.

Or it is possible to install some ball or roller bearings through structural adjustment, as shown in Figure 28, or even open assembly bearings. Bearings allow for smoother rotation and smooth radial support.

In addition, open bearings can be used for further improvement. Unlike the above figure, the radial bearing raceway is used as radial support, and a certain space is left between the positioning sleeve and the bearing. A spring with a small stroke is installed, which can be released in the The amount of axial movement caused by the axial vibration caused by the formation when the screw rotates.

In short, any step of improvement needs to be adjusted and arranged according to actual design needs, not limited to these examples.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the scope of protection of the present utility model.

Claims (7)

1. A prevent that oil from boring and adopting drill bit balling pulse device's screw rod drilling tool, its characterized in that: the novel universal shaft comprises an inner sleeve and an outer sleeve, wherein a central hole is formed in the center of the inner sleeve, flow guide holes communicated with the central hole are formed in the periphery of the inner sleeve, one end of the inner sleeve is connected with a universal shaft, the other end of the inner sleeve is connected with a transmission shaft, the outer sleeve is sleeved outside the inner sleeve and is in sliding fit with the inner sleeve, the outer sleeve is fixed on the inner side of a universal shaft shell, and a strip-shaped groove is formed in the circumferential direction of the outer sleeve.

2. The screw drilling tool for preventing oil drilling bit balling pulse device of claim 1, wherein the number of the strip-shaped grooves is the same as the number of the diversion holes.

3. The screw drill for preventing oil drilling bit balling pulse device according to claim 1, wherein the number of the diversion holes is three, and three strip-shaped grooves are arranged in the circumferential direction of the outer sleeve.

4. The screw drilling tool for preventing oil drilling bit balling pulse device according to claim 1, wherein the number of the diversion holes is 3-6, and the number of the bar grooves is 3-6.

5. The screw drilling tool for preventing oil drilling bit balling pulse device of claim 1, wherein the bar-shaped groove is elongated or sinusoidal or parabolic.

6. The screw drilling tool for preventing oil drilling bit balling pulse device of claim 1, wherein a radial bearing is disposed between the cardan shaft housing and the inner sleeve.

7. The screw drilling tool for preventing oil drilling bit balling pulse device of claim 6, wherein one side of the radial bearing is connected with the outer sleeve, and the other side of the radial bearing is provided with a positioning sleeve.

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