Well casing oscillation resistance reducing device

Abstract

The utility model relates to the technical field of well drilling equipment, in particular to a well drilling casing oscillation resistance reducing device which comprises an eccentric wheel oscillation assembly which is installed at the drill bit end below a casing and provides an oscillation function for the casing. A turbine power generation assembly is arranged on the sleeve and provides a driving source for the eccentric wheel oscillation assembly; a layer of oscillation pipe set is further wrapped outside the sleeve, the two ends of the oscillation pipe set abut against the outer wall of the sleeve in a sealed mode, a sealed space exists between the oscillation pipe set and the sleeve, and the eccentric wheel oscillation assembly and the turbine power generation assembly are located in the sealed space. The outer surface of the oscillation tube group is corrugated, so that the side oscillation effect is improved; pressure sensors are further arranged at the two ends of the oscillation tube set, and the oscillation amplitude is adjusted according to the magnitude of pressure. The utility model solves the technical problem that the drilling casing pipe is difficult to quickly descend due to the resistance of a collapsed soil layer when the drilling casing pipe descends into a drilling channel.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of drilling equipment, specifically, a kind of drilling casing oscillation drag reduction device. BACKGROUND

[0002] Drilling casing is the key structural component for reinforcing well wall, isolating stratum and controlling fluid flow in oil and gas well or geological exploration well.Casing can prevent collapse at soft stratum in wellbore, maintain wellbore stability, isolate stratum, separate different pressure or fluid layer (such as water layer, oil and gas layer), prevent channeling, and provide safe passage for subsequent drilling and well completion, and provide installation carrier for production string and downhole tool.

[0003] The utility model discloses a kind of rotating vibration casing guide downhole tools, and the patent with the utility model name of "a kind of rotating vibration casing guide downhole tools", announcement number CN208024274U of Chinese utility model patent, the patent includes outer tube assembly, drive assembly;Drive assembly includes piston cylinder assembly, guide sleeve and piston rod;Piston rod is sequentially provided annular piston, piston rod flow guide hole, "Z" guide groove and spline sleeve from top to bottom outside;Piston cylinder assembly is between outer tube and piston rod.The utility model generates up-down impact vibration by hydraulic drive piston rod, effectively reduces the resistance in casing downhole process, reduces the resistance of end guide shoe to stratum.

[0004] Although the utility model can reduce the resistance from bottom end of bottom layer in casing downhole by vertical impact force, during the movement of casing, not only end guide shoe will be subjected to resistance, the side wall of casing will also be subjected to resistance in the wall of wellbore, especially the mud block prone to collapse in part of soft stratum, which will collapse and wrap the side wall of casing during casing downhole, increase the resistance of downhole, and part of hard mud block will also exert lateral pressure, leading to the situation that casing is prone to friction damage during downhole. SUMMARY

[0005] The purpose of the present application is to provide a kind of drilling casing oscillation drag reduction device, solve the technical problem that drilling casing is subjected to the resistance of collapsed soil layer and is difficult to be quickly lowered when being lowered in wellbore.

[0006] In order to solve the above technical problems, the scheme adopted by the present application is as follows:

[0007] A kind of drilling casing oscillation drag reduction device, including eccentric oscillation assembly, eccentric oscillation assembly is installed in the lower drill bit end of casing.

[0008] Preferably, the eccentric oscillation assembly is arranged outside the casing pipe.

[0009] Preferably, turbine power generation assembly is arranged on the casing, and the turbine power generation assembly is connected with the eccentric oscillation assembly through a circuit.

[0010] Preferably, the turbine power generation assembly comprises turbine blades arranged on the inner wall of the sleeve, and the generator is fixed outside the sleeve, and the turbine blades are connected to the rotating shaft of the generator.

[0011] Preferably, the sleeve is further coated with an oscillation tube group, the two ends of the oscillation tube group are in sealing abutment with the outer wall of the sleeve, and a sealed space exists between the oscillation tube group and the sleeve, and the eccentric oscillation assembly and the turbine power generation assembly are located in the sealed space.

[0012] Preferably, the outer surface of the oscillation tube group is corrugated.

[0013] Preferably, the two ends of the oscillation tube group are further provided with pressure sensors, and the pressure sensors are connected to the control end of the eccentric oscillation assembly through a circuit.

[0014] Preferably, the main shaft of the turbine blade further has a sealing bearing fixed on the passage of the sleeve, and the sealing bearing is rotatably sleeved on the main shaft of the turbine blade.

[0015] Preferably, the eccentric oscillation assembly comprises a motor and an eccentric wheel.

[0016] Preferably, the motor is fixed on the outer wall of the sleeve, the eccentric wheel is sleeved on the driving shaft of the motor, and the motor is connected to the generator through an electric wire.

[0017] Preferably, the eccentric oscillation assembly further comprises an eccentric hole.

[0018] Preferably, the eccentric wheel is uniformly arranged with at least two through eccentric holes, the different eccentric holes are inconsistent with the center of gravity of the eccentric wheel, and the eccentric wheel is sleeved on the driving shaft of the motor through the eccentric hole.

[0019] Preferably, the driving shaft of the motor is further threadedly sleeved with a nut, and the eccentric wheel is located between the motor and the nut.

[0020] Preferably, the oscillation tube group comprises a corrugated tube.

[0021] Preferably, the corrugated tube is fixedly sleeved outside the sleeve, the surface of the corrugated tube is corrugated, and the corrugated tube has a rigid structure as a whole.

[0022] Preferably, the two ends of the corrugated tube are provided with straight pipes, and the straight pipes at the two ends are axially clamped on the outer wall of the sleeve.

[0023] Preferably, the straight pipe and the outer wall of the sleeve are further fixedly connected with an elastic ring.

[0024] Preferably, the outer ends of the straight pipes at the two ends of the corrugated tube are respectively in abutment with guide heads, the guide heads are fixed outside the sleeve, and the axial outer ends of the guide heads are conical structures.

[0025] Preferably, the pressure sensor is fixedly arranged on the sleeve and located between the outer wall of the sleeve and the elastic ring.

[0026] The technical scheme has at least the following advantages and beneficial effects:

[0027] In the utility model, the eccentric wheel oscillation assembly is arranged outside the sleeve, the periodic vibration generated when the eccentric wheel rotates is utilized to provide oscillation effect for the sleeve, the sleeve can vibrate and break the collapsed soil layer in the channel during the process of lowering the drilling channel, and the sleeve is lowered quickly; the turbine power generation assembly is further arranged on the sleeve, the turbine is placed in the high-pressure flowing drilling fluid in the sleeve, and self-power generation is realized through the rotation of the turbine, so that the power supply is still provided for the various power components (such as the eccentric wheel oscillation assembly) in the deep drilling channel far from the ground.

[0028] In the utility model, the oscillation pipe group is arranged outside the sleeve, the oscillation pipe group is wrapped around the various power components, the influence of the external liquid on the power components is insulated, the surface of the oscillation pipe group is arranged in a corrugated shape, so that more mud blocks in the side channel are contacted, when the oscillation effect is generated, the collapsed mud blocks in the side channel can be quickly scattered, and the sliding resistance is small during the subsequent lowering of the sleeve; in addition, the pressure sensor is further arranged on the oscillation pipe group, when the harder mud blocks press the oscillation pipe group from the side, the pressure sensor controls the eccentric wheel oscillation assembly to increase the rotating speed, so that the oscillation amplitude is automatically increased, and the harder mud blocks are quickly broken.

[0029] In the utility model, the axial direction of the oscillation pipe group is fixed on the sleeve, and the circumferential direction of the oscillation pipe group is elastically fixed on the sleeve, so that most of the oscillation effect in the circumferential direction is buffered and offset, the circumferential oscillation effect of the oscillation pipe group on the mud blocks in the side channel is reduced, and the probability of secondary collapse of the mud blocks due to the circumferential oscillation is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a sectional view structural schematic drawing of the utility model.

[0031] Figure 2 It is a sectional view structural schematic drawing of the turbine power generation assembly in the utility model.

[0032] Figure 3 It is a sectional view structural schematic drawing of the eccentric wheel oscillation assembly in the utility model.

[0033] Figure 4 It is a sectional view structural schematic drawing of the oscillation pipe group in the utility model.

[0034] Figure 5 It is a structural schematic drawing of the utility model.

[0035] Figure 6 Another angle of the cross-sectional structure of the turbine power generation assembly in the utility model is shown in the figure.

[0036] Figure 7 Another angle of the cross-sectional structure of the oscillation pipe group in the utility model is shown in the figure.

[0037] In the figure: 1 - sleeve, 2 - turbine power generation assembly, 201 - turbine fan blade, 202 - generator, 203 - sealed bearing, 3 - eccentric wheel oscillation assembly, 301 - motor, 302 - eccentric wheel, 303 - nut, 304 - eccentric hole, 4 - oscillation pipe group, 401 - corrugated pipe, 402 - guide head, 403 - straight pipe, 404 - elastic ring, 5 - pressure sensor. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0039] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. If the terms "center", "upper", "lower", "inner", "outer" and the like indicate the orientation or position relationship shown in the drawings, or the orientation or position relationship of the product in use, which is only for the convenience of describing the application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the application. It should also be noted that, unless otherwise explicitly specified and limited, if the terms "set", "install", "connect" appear, they should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrally connected; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements inside. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0040] Embodiment 1

[0041] Please refer to Figures 1-7The utility model provides a kind of well casing oscillation drag reduction device, including eccentric wheel oscillation subassembly 3, eccentric wheel oscillation subassembly 3 is installed in the lower drill bit end of casing 1, for casing 1 exert oscillation effect, drive casing 1 continuous oscillation, to be scattered in the mud block that collapse jams in well channel when casing 1 is stretched to well, facilitate the rapid stretching of casing 1.

[0042] Because the common well casing 1 is hollow in pipe, in the process that staff continuously place casing 1 in well channel, high pressure drilling fluid is generally also introduced in casing 1, further flushes away mud block in drill bit end of casing 1, and reduces resistance for the casing 1 that stretches (drilling fluid mixes with mud block in well channel, reduces the frictional resistance of mud block to casing 1), therefore eccentric wheel oscillation subassembly 3 is arranged outside the pipe of casing 1, to reduce the influence on the flow of drilling fluid in casing 1.

[0043] Further, turbine power generation subassembly 2 is also provided on casing 1, turbine power generation subassembly 2 can generate electricity by itself, and turbine power generation subassembly 2 is connected with eccentric wheel oscillation subassembly 3 by circuit, to provide driving power for eccentric wheel oscillation subassembly 3.

[0044] Turbine power generation subassembly 2 includes turbine fan blade 201, generator 202 and sealed bearing 203.

[0045] Specifically, turbine fan blade 201 is rotationally arranged on the inner wall of casing 1, generator 202 is fixed outside casing 1, and the main shaft of turbine fan blade 201 is fixedly connected to the rotating shaft of generator 202; when casing 1 is inserted into well channel and high-pressure drilling fluid is introduced into the pipe, the high-speed flow of drilling fluid drives turbine fan blade 201 to rotate, which in turn drives the rotating shaft of generator 202 to rotate, so that generator 202 generates electricity.

[0046] The main shaft of turbine fan blade 201 also has a sealed bearing 203 fixed on the passage of casing 1, and the sealed bearing 203 is rotationally arranged on the main shaft of turbine fan blade 201; when turbine fan blade 201 contacts high-pressure drilling fluid and rotates, the sealed bearing 203 ensures that turbine fan blade 201 normally drives the main shaft of generator 202 outside the pipe of casing 1 to rotate, while reducing the leakage of drilling fluid in casing 1 from this point to the outside of the pipe and the penetration of drilling fluid into the internal of generator 202 to cause failure.

[0047] Further, casing 1 is also covered with an oscillation pipe group 4, the two ends of oscillation pipe group 4 are in sealing abutment with the outer wall of casing 1, and there is a sealed gap space between oscillation pipe group 4 and casing 1, eccentric wheel oscillation subassembly 3 and turbine power generation subassembly 2 are arranged in the gap space, so as to be isolated from the mud in the external well channel and the drilling fluid in casing 1, reducing the influence of the contained water in it on each power component.

[0048] The outer surface of the oscillation pipe group 4 is corrugated to increase the contact surface area with the external drilling channel. Since the oscillation pipe group 4 is in contact with the casing 1, the oscillation effect on the casing 1 is transmitted to the oscillation pipe group. The corrugated surface of the oscillation pipe group is in contact with more mud in the drilling channel to increase the softness of the mud in the drilling channel and reduce the resistance of the casing 1 to the subsequent extension into the drilling channel, thereby facilitating the rapid extension of the casing 1.

[0049] It is worth noting that in the drilling work, since the drilling channel is long (tens of meters to hundreds of meters), the casing 1 is placed in the drilling channel in the form of a combination of sections. The worker first places a section of the casing 1 into the drilling channel, then threadedly fixes another section of the casing 1 at the end of the section to continue to place it, and so on. The first section of the casing 1 is used to dredge the drilling channel during the placement process. Therefore, the casing 1 oscillation and resistance reduction device in this embodiment is arranged on the first section of the casing 1. Although the corrugated surface of the oscillation pipe group increases the sliding resistance of the first section of the casing 1 during the extension of the casing 1, the oscillation pipe group 4 can further reduce the sliding resistance of the subsequent sections of the casing 1 during the extension of the casing 1. Therefore, the oscillation pipe group 4 reduces the sliding resistance of the entire casing 1 during the extension of the casing 1.

[0050] Further, the two ends of the oscillation pipe group 4 are also provided with pressure sensors 5 connected to the control end of the eccentric wheel oscillation assembly 3 through a circuit. When the casing 1 is extended and the hard mud in the drilling channel collapses onto the surface of the casing 1 and the oscillation pipe group 4, the oscillation pipe group 4 in oscillation may not be able to shake the mud due to the small oscillation amplitude, causing the mud to press against the surface of the oscillation pipe group 4. When the pressure sensor 5 at the oscillation pipe group 4 senses a set threshold of pressure increase, the pressure sensor 5 sends a signal to the control end of the eccentric wheel oscillation assembly 3, so that the control end controls the eccentric rotation speed of the eccentric wheel oscillation assembly 3 to increase, thereby increasing the amplitude of the eccentric oscillation, and quickly shaking the hard mud. When the mud is shaken, the pressure sensor 5 is pressed to a smaller pressure, sends a signal to the control end, and the oscillation amplitude of the eccentric wheel oscillation assembly 3 returns to a normal size, thereby realizing the automatic adjustment function of the oscillation amplitude of the eccentric wheel oscillation assembly 3 through the pressure sensor 5.

[0051] Embodiment 2

[0052] Please refer to Figure 2 and Figure 3 In this embodiment, the eccentric wheel oscillation assembly 3 includes a motor 301, an eccentric wheel 302, a nut 303, and an eccentric hole 304 to realize the oscillation effect on the casing 1.

[0053] Specifically, the motor 301 is fixed on the outer wall of the casing 1, and an eccentric wheel 302 is sleeved on the driving shaft of the motor 301. The motor 301 is connected to the generator 202 through wires. When the motor 301 is started, the eccentric wheel 302 is driven to rotate. The eccentric wheel 302 is eccentrically arranged with the driving shaft, so that the eccentric wheel 302 generates periodic vibration when rotating, thereby achieving the oscillation effect. Because the motor 301 is fixed on the casing 1, the oscillation effect is transmitted to the casing 1.

[0054] The eccentric wheel 302 is sleeved on the driving shaft of the motor 301 through the eccentric holes 304. When the eccentric holes 304 at different positions are sleeved on the driving shaft of the motor 301, the oscillation amplitudes generated are different because the eccentric holes 304 at different positions are different from the center of gravity of the eccentric wheel 302. Therefore, the worker can adjust the initial oscillation amplitude of the eccentric wheel 302 by adjusting the sleeving hole position of the eccentric wheel 302.

[0055] In addition, the driving shaft of the motor 301 is also threadedly sleeved with a nut 303. The eccentric wheel 302 is located between the motor 301 and the nut 303. By twisting the nut 303, the eccentric wheel 302 on the driving shaft of the motor 301 can be quickly fixed or removed.

[0056] Embodiment 3

[0057] Please refer to Figures 4-7 In this embodiment, the oscillation pipe group 4 includes a corrugated pipe 401, a guide head 402, a straight pipe 403, and an elastic ring 404 in order to enhance the oscillation effect on the mud in the drilling channel.

[0058] Specifically, the corrugated pipe 401 is fixedly sleeved outside the casing 1. The surface of the corrugated pipe 401 is in a corrugated shape, and the whole is a hard structure with a small deformation amount under stress, thereby reducing the damping effect of the corrugated pipe 401, facilitating the conduction of the oscillation force from the casing 1, and improving the oscillation effect on the mud on the corrugated surface outside the pipe.

[0059] The two ends of the corrugated pipe 401 are provided with straight pipes 403, the two ends of the straight pipes 403 are clamped on the outer wall of the casing pipe 1, and the two are clamped and matched through the clamping ring and the clamping groove, so as to limit the axial movement of the corrugated pipe 401 on the casing pipe 1, so that the corrugated pipe 401 is subjected to the oscillation effect along the axial direction of the casing pipe 1; and the straight pipe 403 and the outer wall of the casing pipe 1 are further fixedly connected with an elastic ring 404, the elastic ring 404 is provided with high-temperature-resistant rubber, has an elastic buffering effect, and when the oscillation force in the circumferential direction of the casing pipe 1 is transmitted to the corrugated pipe 401, part of the circumferential oscillation force is absorbed by the elastic ring 404, so that the circumferential oscillation effect on the corrugated pipe 401 is reduced. Because the oscillation along the axial direction of the casing pipe 1 can limit the oscillation force in the entire drilling channel, the oscillation along the extension direction of the drilling channel has less damage to the pipe wall of the drilling channel; and the oscillation along the circumferential direction of the casing pipe 1 will impact the pipe wall of the drilling channel all the time, so that more mud blocks are peeled off from the pipe wall, the oscillation difficulty is increased, and the resistance of the drilling pipe is easily further increased.

[0060] The outer ends of the straight pipes 403 at the two ends of the corrugated pipe 401 are further respectively abutted with guide heads 402, the guide heads 402 are fixed on the outside of the casing pipe 1, and the axial outer ends of the guide heads 402 are all provided with a conical structure. Because the entire corrugated pipe 401 is located outside the casing pipe 1 and protrudes from the casing pipe 1, the guide heads 402 arranged at the two axial ends of the corrugated pipe 401 can reduce the sliding resistance of the corrugated pipe 401 in the drilling channel.

[0061] In addition, the elastic ring 404 (i.e. high-temperature-resistant rubber) is connected between the two axial ends of the corrugated pipe 401 and the casing pipe 1. The sealing property of the rubber blocks the two ends of the corrugated pipe 401, so that a sealed space is formed between the corrugated pipe 401 and the casing pipe 1, and the turbine generator 202 group, the eccentric oscillation assembly and the pressure sensor 5 are arranged in the sealed space, so as to isolate the water in the drilling fluid and the mud blocks, and provide a relatively dry working environment for each power assembly, so as to maintain the normal work of the power assembly.

[0062] It is worth noting that the pressure sensor 5 is fixedly arranged on the casing pipe 1 and located between the outer wall of the casing pipe 1 and the elastic ring 404. When the mud blocks extrude the corrugated pipe 401, the corrugated pipe 401 will be axially displaced to extrude the elastic ring 404. The elastic ring 404 not only buffers the impact force of the mud blocks on the casing pipe 1, but also applies pressure to the pressure sensor 5, so as to detect whether the pressure applied by the external mud blocks is too large, so as to reduce the overpressure damage to the casing pipe 1.

[0063] So far, the embodiments of the utility model have been described in detail. In order to avoid shielding the concept of the utility model, some details known in the art are not described. Those skilled in the art can fully understand how to implement the technical solutions of the utility model according to the above description, and the scope of the utility model is defined by the appended claims.

Claims

1. A drilling casing oscillation drag reduction device comprising an eccentric oscillation assembly (3) mounted below a drill bit end of a casing (1), Characterized in that; The eccentric wheel oscillation assembly (3) is arranged outside the pipe of the sleeve pipe (1); The sleeve pipe (1) is provided with a turbine power generation assembly (2), and the turbine power generation assembly (2) is connected with the eccentric wheel oscillation assembly (3) through an electric circuit; The turbine power generation assembly (2) comprises turbine blades (201) arranged on the inner wall of the sleeve pipe (1), and a generator (202) fixed outside the sleeve pipe (1), wherein the turbine blades (201) are connected with the rotating shaft of the generator (202); The sleeve pipe (1) is further covered with an oscillation pipe group (4), the two ends of the oscillation pipe group (4) are in sealing abutment with the outer wall of the sleeve pipe (1), and there is a sealed space between the oscillation pipe group (4) and the sleeve pipe (1), wherein the eccentric wheel oscillation assembly (3) and the turbine power generation assembly (2) are located in the sealed space; The outer surface of the oscillation pipe group (4) is corrugated; The two ends of the oscillation pipe group (4) are further provided with pressure sensors (5), and the pressure sensors (5) are connected with the control end of the eccentric wheel oscillation assembly (3) through an electric circuit.

2. A drag reducing device for oscillating drill pipe as defined in claim 1 wherein, The main shaft of the turbine blades (201) is further fixed with a sealing bearing (203) arranged through the passage of the sleeve pipe (1), and the sealing bearing (203) is rotatably sleeved on the main shaft of the turbine blades (201).

3. A drag reducing device for oscillating drill pipe as defined in claim 1 wherein, The eccentric wheel oscillation assembly (3) comprises a motor (301) and an eccentric wheel (302); The motor (301) is fixed on the outer wall of the sleeve pipe (1), the driving shaft of the motor (301) is sleeved with the eccentric wheel (302), and the motor (301) is connected with the generator (202) through an electric wire.

4. A drag reducing device for oscillating drill pipe as defined in claim 3 wherein, The eccentric wheel oscillation assembly (3) further comprises eccentric holes (304); The eccentric wheel (302) is uniformly arranged with at least two through eccentric holes (304), the different eccentric holes (304) are not consistent with the center of gravity of the eccentric wheel (302), and the eccentric wheel (302) is sleeved on the driving shaft of the motor (301) through the eccentric holes (304).

5. A drag reducing device for oscillating drill pipe as defined in claim 3 wherein, The driving shaft of the motor (301) is further threadedly sleeved with a nut (303), and the eccentric wheel (302) is located between the motor (301) and the nut (303).

6. A drag reducing device for oscillating drill pipe as defined in claim 1 wherein, The oscillation pipe group (4) comprises a corrugated pipe (401); The corrugated pipe (401) is fixedly sleeved outside the sleeve pipe (1), and the surface of the corrugated pipe (401) is corrugated and has a rigid structure as a whole.

7. A drag reducing device for oscillating drill pipe as defined in claim 6 wherein, The two ends of the corrugated pipe (401) are provided with straight pipes (403), and the two straight pipes (403) are axially clamped on the outer wall of the sleeve pipe (1); The straight pipes (403) and the outer wall of the sleeve pipe (1) are further fixedly connected with elastic rings (404).

8. A drag reducing device for oscillating drill pipe as defined in claim 7 wherein, The outer ends of the straight pipes (403) at the two ends of the corrugated pipe (401) are respectively abutted with guide heads (402), the guide heads (402) are fixed outside the sleeve pipe (1), and the outer ends of the guide heads (402) are conical structures.

9. A drag reducing device for oscillating drill pipe as defined in claim 1 wherein, The pressure sensors (5) are fixedly arranged on the sleeve pipe (1) and located between the outer wall of the sleeve pipe (1) and the elastic rings (404).

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