1. An anti-jamming structure is characterized by comprising a transmission shaft (1), a transmission shaft cylinder (2) and a universal shaft shell (3); the universal shaft is characterized in that a cutting-preventing sleeve (4) is fixedly sleeved on the transmission shaft (1), the other end of the cutting-preventing sleeve (4) is jointly covered on the transmission shaft cylinder body (2) and the universal shaft shell (3), and at least one cutting knife group (5) is further arranged on the outer wall of the cutting-preventing sleeve (4).

2. The anti-seize structure according to claim 1, characterized in that a small annular space (14) is formed between the inner wall of the anti-seize sleeve (4) and the outer wall of the transmission shaft cylinder (2) and between the inner wall of the anti-seize sleeve (4) and the outer wall of the universal shaft housing (3).

3. The anti-jamming structure according to claim 2, characterized in that the transmission shaft (1) is hollow, and the transmission shaft (1) is further provided with a through hole (17) for communicating the inside of the transmission shaft (1) with the small annulus (14).

4. The anti-jamming structure according to claim 1, characterized in that cutting teeth (6) are further provided at both ends of the anti-jamming sleeve (4).

5. The anti-seize structure according to claim 1, wherein the cutting blade group (5) is formed in a spiral shape, and the surface of the cutting blade group (5) is formed in a saw-tooth shape.

6. The anti-seize structure according to claim 1, wherein the anti-seize sleeve (4) is threadedly connected with the transmission shaft (1).

7. The anti-seize structure according to claim 5, wherein the cutting group (5) further has a through hole (16) extending transversely therethrough.

8. The anti-jamming structure according to claim 1, characterized in that the transmission shaft (1) is further provided with a limiting ring (7), and the inner wall of the anti-jamming sleeve (4) is provided with a limiting spigot (8) matched with the limiting ring (7).

9. The anti-jamming structure according to claim 1, characterized in that a transmission shaft assembly (9) fastened to the front end surface of the transmission shaft cylinder (2) is arranged in the transmission shaft cylinder, and a sealing ring (10) is further arranged between the front end of the transmission shaft assembly (9) and the anti-jamming sleeve (4).

10. An anti-sticking drilling tool, characterized by comprising the anti-sticking structure of any claim 1-9, and further comprising a universal shaft assembly (11), a rotor assembly (12) and a drill bit (18), wherein the rotor assembly (12), the universal shaft assembly (11) and the transmission shaft (1) are sequentially connected, the drill bit (18) is installed on the transmission shaft (1), and the universal shaft assembly (11) is further provided with a circulation channel (13) for communicating the interior of the transmission shaft (1) and the inner wall of the universal shaft housing (3).

Background

When the oil field is drilled with underground cement plugs and other well repair operations, a screw drilling tool needs to be used, and high-pressure liquid flow is input by the ground to drive the screw drilling tool to rotate. Therefore, high-pressure liquid flow input from the ground passes through the screw drill which consists of a stator and a rotor which are tightly matched, and when the high-pressure liquid flow impacts, the rotor rotates to drive the drill bit to rotate so as to carry out well repairing operation. However, when drilling in a stratum which is easy to collapse, the stratum often collapses due to the reasons of breakage or expansion and the like, so that coal dust cannot be discharged and broken in time, the drilling tool is buried or blocked, and if the condition is serious, the whole drilling tool cannot be lifted or lowered, the operation and the service life are influenced, and economic loss is caused.

Disclosure of Invention

The invention aims to provide an anti-jamming structure and an anti-jamming drilling tool with the same, which not only enable the drilling tool to perform drilling in a positive mode when the drilling tool is buried in a collapsed stratum, but also are convenient to use and ensure the service life of the drilling tool.

In order to realize the purpose of the invention, the technical scheme is as follows: an anti-jamming structure comprises a transmission shaft, a transmission shaft cylinder and a universal shaft shell; the transmission shaft is fixedly sleeved with an anti-blocking sleeve, the other end of the anti-blocking sleeve covers the transmission shaft cylinder and the universal shaft shell together, and the outer wall of the anti-blocking sleeve is further provided with at least one cutting knife set.

Furthermore, small annular spaces are formed between the inner wall of the anti-blocking sleeve and the outer wall of the transmission shaft cylinder body and between the inner wall of the anti-blocking sleeve and the outer wall of the universal shaft shell body.

Furthermore, the transmission shaft is internally hollow, and is also provided with a through hole for communicating the inside of the transmission shaft with the small annulus.

Furthermore, cutting teeth are further arranged at two ends of the anti-blocking sleeve.

Furthermore, the anti-blocking sleeve is in threaded connection with the transmission shaft.

Furthermore, the cutting knife group is spiral, and the surface of the cutting knife group is in a sawtooth shape.

Furthermore, the cutting knife group is also provided with a through hole which penetrates transversely.

Furthermore, the transmission shaft is also provided with a limiting ring, and the inner wall of the anti-blocking sleeve is provided with a limiting spigot matched with the limiting ring.

Furthermore, a transmission shaft assembly is arranged in the transmission shaft barrel body and is buckled with the front end face of the transmission shaft barrel body, and a sealing ring is arranged between the front end of the transmission shaft assembly and the anti-clamping sleeve.

An anti-sticking drilling tool comprises the anti-sticking structure.

Further, still include universal shaft assembly, rotor assembly and drill bit, rotor assembly, universal shaft assembly and transmission shaft connect gradually, and the drill bit is installed on the transmission shaft, and the universal shaft assembly still sets up the circulation passageway between inside and the universal shaft shell inner wall of intercommunication transmission shaft.

The beneficial effect of the invention is that,

1. the anti-blocking sleeve is fixedly arranged on the transmission shaft, so that the transmission shaft drives the anti-blocking sleeve to rotate while rotating, the cutting knife set is arranged on the anti-blocking sleeve, the anti-blocking sleeve rotates along with the transmission shaft, the cutting knife set on the anti-blocking sleeve repairs the well wall, and when the well wall falls or collapses, the cutting knife set on the anti-blocking sleeve can crush the falling blocks, so that the drilling tool is effectively prevented from being blocked, and the drilling tool can be normally lifted or placed.

2. Because prevent cutting ferrule inner wall and transmission shaft barrel outer wall, universal shaft shell outer wall clearance fit, make the inside small-size annular space that forms of cutting ferrule, and through between transmission shaft barrel and the universal shaft shell or the mud that transmission shaft assembly department leaked directly enter into this small-size annular space in, and finally spray through the rear end of preventing the cutting ferrule, make the rear end department of preventing the cutting ferrule form reverse jet, reach the purpose of wasing this department, can not only avoid the detritus to take place to pile up, and prevent effectively that the drilling tool from producing the jam.

Drawings

FIG. 1 is a cross-sectional view of an anti-sticking drill provided by the present invention;

FIG. 2 is a block diagram of a card-resistant sleeve;

FIG. 3 is a block diagram of another embodiment of an anti-seize sleeve;

fig. 4 is a cross-sectional view of the anti-seize sleeve.

Reference numbers and corresponding part names in the drawings:

1. the universal shaft comprises a transmission shaft body, 2, a transmission shaft barrel body, 3, a universal shaft shell, 4, an anti-clamping sleeve, 5, a cutting cutter set, 6, cutting teeth, 7, a limiting ring, 8, a limiting spigot, 9, a transmission shaft assembly, 10, a sealing ring, 11, a universal shaft assembly, 12, a rotor assembly, 13, a flow passage, 14, a small annular space, 15, a spiral guide groove, 16, a through hole, 17, a through hole, 18 and a drill bit.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.

As shown in fig. 1 to 4, the anti-jamming structure provided by the invention comprises a transmission shaft 1, a transmission shaft cylinder 2 and a universal shaft shell 3, wherein the transmission shaft cylinder 2 and the universal shaft shell 3 are jointly sleeved on the transmission shaft 1, the front end of the transmission shaft 1 is used for installing a drill bit, and the rear end of the transmission shaft 1 is used for connecting with a universal shaft assembly 11; the utility model discloses a transmission shaft, including transmission shaft 1, transmission shaft barrel 2 and universal shaft casing 3, the outer common cover of transmission shaft 1, transmission shaft barrel 2 and universal shaft casing 3 is equipped with prevents cutting ferrule 4, and the front end of preventing cutting ferrule 4 is fixed on transmission shaft 1, and the relative transmission shaft barrel 2 in the middle part of preventing cutting ferrule 4 rotates, and the relative universal shaft casing 3 in preventing cutting ferrule 4 rear end rotates, makes transmission shaft 1 when rotating, and transmission shaft 1 drives prevents cutting ferrule 4 synchronous rotation, and prevents cutting ferrule 4 can not drive transmission shaft barrel 2 and universal shaft casing 3 when the pivoted and rotate.

Prevent that cutting ferrule 4 outer wall still is equipped with at least one cutting knife tackle 5, cutting knife tackle 5 and anti-sticking cover 4 are integrated into one piece, because it is fixed with transmission shaft 1 to prevent cutting ferrule 4, make transmission shaft 1 when rotating, cutting knife tackle 5 on the anti-sticking cover 4 is maintained the wall of a well, and when meetting the wall of a well and having the piece or the wall of a well collapses, cutting knife tackle 5 on the anti-sticking cover 4 can be to falling the piece breakage to effectively prevent the drilling tool to take place the card and hinder, and make the drilling tool normally lift or transfer, convenient to use can make the drilling tool life-span obtain guaranteeing.

In some embodiments, the inner wall of the anti-seizing sleeve 4 is in clearance fit with the outer wall of the transmission shaft cylinder 2 and the outer wall of the universal shaft shell 3, so that not only can the anti-seizing sleeve 4, the transmission shaft cylinder 2 and the universal shaft shell 3 be effectively prevented from being worn when the transmission shaft 1 drives the anti-seizing sleeve 4 to rotate, but also a small annular space 14 is formed between the inner wall of the anti-seizing sleeve 4 and the outer wall of the transmission shaft cylinder 2 and between the inner wall of the anti-seizing sleeve 4 and the universal shaft shell 3, so that slurry leaked from the transmission shaft cylinder 2 and the universal shaft shell 3 or the transmission shaft assembly 9 during drilling of a drilling tool directly enters the small annular space 14, and as the rear end of the small annular space 14 is open, the slurry entering the small annular space 14 is ejected from the rear end of the anti-seizing sleeve 4, so that reverse jet flow is formed at the rear end of the anti-seizing sleeve 4, the purpose of cleaning the well wall can be achieved, and rock debris accumulation can be avoided, effectively prevent the drilling tool from generating jamming.

In some embodiments, 1 inside hollow structure that is of transmission shaft, still set up the through-hole 17 that communicates 1 inside and small-size annular space 14 of transmission shaft on the transmission shaft 1, make partly mud can directly enter into small-size annular space 14 through-hole 17 in, guarantee to enter into the mud in the small-size annular space 14 and have sufficient pressure, make the mud that erupts through preventing cutting ferrule 4 rear end have sufficient impact force, not only make the cleaning performance of the wall of a well better, and make the impact effect of detritus better.

In some embodiments, the cutting teeth 6 are further arranged at two ends of the anti-sticking sleeve 4, the cutting teeth 6 are multiple, the cutting teeth 6 are arranged at intervals along the circumferential direction of the anti-sticking sleeve 4, so that the drilling tool can drill along with the rotation of the anti-sticking sleeve 4 in the drilling process, the drilling effect of the drilling tool is better, and the phenomenon that the drilling tool collapses or drops in the drilling process and blocks are stuck due to the front end of the anti-sticking sleeve 4 is effectively avoided.

In some embodiments, the two ends of the anti-jamming sleeve 4 are further provided with chamfers, the cutting teeth 6 are positioned on the chamfers, and the axial direction and the chamfers of the cutting teeth 6 enable the drilling tool to advance more conveniently in the drilling process, so that the collapse or falling of the anti-jamming sleeve 4 is avoided, the anti-jamming sleeve is blocked with the end face of the front end of the anti-jamming sleeve 4, and the drilling effect of the drilling tool is better.

In some embodiments, the anti-blocking sleeve 4 is in threaded connection with the transmission shaft 1, so that the connection mode between the anti-blocking sleeve 4 and the transmission shaft 1 is more convenient; meanwhile, in order to prevent the drilling tool from falling off in the drilling process, the screwing direction of the anti-blocking sleeve 4 can be opposite to the drilling direction of the transmission shaft 1, so that the screwing direction of the anti-blocking sleeve 4 is always one example in the drilling process of the drilling tool, and the fixing effect of the anti-blocking sleeve 4 is better.

In some embodiments, the cutting knife groups 5 are helical, the cutting knife groups 5 are arranged along the outer wall of the anti-jamming sleeve 4 in a helical manner, and the plurality of cutting knife groups 5 are arranged along the circumferential direction of the anti-jamming sleeve 4 at even intervals, and two ends of each cutting knife group 5 are flush with two ends of the anti-jamming sleeve 4 respectively, so that when the anti-jamming sleeve 4 rotates along with the transmission shaft 1, because the outer wall of each cutting knife group 5 is matched with the well wall, a helical guide groove 15 is formed between every two adjacent cutting knife groups 5, mud can flow through the helical guide groove 15, but the anti-jamming sleeve 4 can drive the mud in the helical guide groove 15 to move synchronously when rotating, so that the mud in the helical guide groove 15 is subjected to a centrifugal force, the flow rate of the mud can be increased, and the mud sent out through the helical guide groove 15 forms reverse jet flow, and the cleaning effect of the well wall is better. The surface of the cutting knife group 5 is in a sawtooth shape, so that the structure of the cutting knife group 5 is simpler while the requirement of the cutting knife group 5 on well wall finishing is met.

In some embodiments, the cutting blade set 5 further has a through hole 16 passing through in the transverse direction, and the axial direction of the through hole 16 is the same as the width direction of the cutting blade set 5 or the axial direction of the through hole 16 is inclined to the width direction of the cutting blade set 5, so that not only can the weight of the anti-blocking sleeve 4 be reduced, but also the slurry can flow through the through hole 16, the flow of the slurry in the spiral guide groove 15 is more disturbed, the slurry is effectively prevented from being deposited in the spiral guide groove 15, and the blocking of the flow of the slurry is avoided.

In some embodiments, the through holes 16 are rectangular holes or circular holes or other shapes, as shown in fig. 3, the through holes 16 are rectangular holes, as shown in fig. 4, and the through holes 16 are rectangular holes.

In some embodiments, the transmission shaft 1 is further provided with a limiting ring 7, the limiting ring 7 and the transmission shaft 1 are of an integral structure, the inner wall of the anti-blocking sleeve 4 is provided with a limiting spigot 8 matched with the limiting ring 7, and through the matching of the limiting ring 7 and the limiting spigot 8, the anti-blocking sleeve 4 can be limited during installation, and the transmission shaft 1 can drive the anti-blocking sleeve 4 not to generate displacement relative to the transmission shaft 1 in the drilling process of the anti-blocking sleeve 4, so that the installation of the anti-blocking sleeve 4 is more stable.

In some embodiments, a transmission shaft assembly 9 fastened to the front end surface of the transmission shaft cylinder 2 is arranged in the transmission shaft cylinder 2, the section of the front end of the transmission shaft assembly 9 abuts against the inner side of the limiting ring 7, so that the transmission shaft assembly 9 is installed, and preliminary sealing is formed between the transmission shaft assembly 9 and the limiting ring 7; simultaneously, still be equipped with sealing washer 10 between transmission shaft assembly 9 front end and the anti-sticking cover 4, make the sealed effect between transmission shaft assembly 9 and the anti-sticking cover 4 better to make the front end of anti-sticking cover 4 sealed, prevent effectively that mud from discharging between anti-sticking cover 4 front end and the transmission shaft 1 outer wall, make the injection effect of mud at the 4 rear ends of anti-sticking cover better, make the cleaning performance of the wall of a well better. At this moment, in order to avoid the through hole 17 from being blocked when the transmission shaft assembly 9 is installed, a communication hole for communicating the through hole 17 with the small annulus 14 is further formed in the transmission shaft assembly 9, so that the inside of the transmission shaft 1 is communicated with the small annulus 14, sufficient slurry is ensured to enter the small annulus 14, and the pressure of the slurry in the small annulus 14 is ensured.

The anti-blocking structure provided by the embodiment can be used in the existing drilling tool, when the anti-blocking structure is used for the drilling tool, the shell of the transmission shaft 1 can be connected with the shell of the rotor assembly 12, the transmission shaft 1 is connected with the assembly of the universal shaft assembly 11, the drill bit is installed on the transmission shaft 1, when the transmission shaft 1 rotates through the transmission of the assembly of the universal shaft 11, the transmission shaft 1 drives the anti-blocking sleeve 4 to synchronously rotate, the cutting teeth 6 on the anti-blocking sleeve 4 expand the diameter of the well wall or break the collapsed falling blocks, the cutting tool set 5 repairs the expanded well wall, slurry leaked between the transmission shaft cylinder 2 and the universal shaft shell 3 or at the transmission shaft assembly 9 directly enters the rear end of the anti-blocking sleeve 4 to be ejected, and the well wall is cleaned or accumulated rock debris is cleaned.

The invention also provides an anti-sticking drilling tool which adopts the anti-sticking structure provided in the embodiment.

The anti-sticking drilling tool further comprises a universal shaft assembly 11, a rotor assembly 12 and a drill bit 18, wherein the rotor assembly 12, the universal shaft assembly 11 and the transmission shaft 1 are sequentially connected, the drill bit 18 is installed on the transmission shaft 1, the universal shaft assembly 11 is further provided with a circulation channel 13 communicated between the inside of the transmission shaft 1 and the inner wall of the universal shaft shell 3, so that slurry entering the rotor assembly 12 enters the space between the universal shaft shell 3 and the universal shaft assembly 11, then enters the transmission shaft 1 through the circulation channel 13, and finally enters the drill bit through the transmission shaft 1, and the drill bit cools the cutting teeth 6 in the drilling process; simultaneously, the mud that enters into between universal shaft housing 3 and the universal shaft assembly 11 accessible transmission shaft barrel 2 and the universal shaft housing 3 or 9 departments of transmission shaft leak of transmission shaft enters into inside preventing the clamping sleeve 4 to finally spray through the rear end of preventing the clamping sleeve 4, make the rear end department of preventing the clamping sleeve 4 form reverse efflux, reach the purpose of wasing this department, can not only avoid the detritus to take place to pile up, and effectively prevent that the drilling tool from producing the card and hinder.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.