CN109113570B - Hydraulic fracturing weakening hard top plate drilling device - Google Patents

Abstract

The invention discloses a hydraulic fracturing weakening hard top plate drilling device, which can conveniently realize the drilling of a hard top plate when the hard top plate is drilled, has high drilling efficiency, drills through an inner drill rod, reams the hard top plate through an outer drill rod, can efficiently drill the hard top plate, consumes relatively less drill bit, adopts a drilling mode of swinging and rotating the inner drill rod, can rapidly drill the hard top plate, has greatly lower axial force of drilling, is convenient for the implementation of the subsequent hydraulic fracturing weakening hard top plate, has simple structure and reasonable transmission, greatly ensures the drilling efficiency of the hard top plate, and simultaneously improves the service life of the drill bit.

Description

Hydraulic Fracturing Weakened Hard Roof Drilling Device

technical field

The invention relates to a hydraulic fracturing weakened hard roof drilling device, and belongs to the technical field of hydraulic fracturing weakened roof auxiliary equipment.

Background technique

The problem of hard roofs has always been a major factor that plagues coal mine safety production. Due to the high strength of the hard roof and the lack of cracks, it is easy to form a large area of suspended roof after mining, and a large amount of gas is easy to accumulate in the suspended roof area. When a large area of overhanging roof suddenly collapses, the impact storm is accompanied by a large amount of gas gushing out, which will not only cause serious damage to support equipment and roadways, but also may cause a series of accidents such as gas outburst and explosion, which will cause injury to personnel and bring helplessness. estimated loss.

In this regard, for the hard roof, it needs to be drilled and then weakened by hydraulic fracturing to facilitate subsequent maintenance and gas drainage. Before the current hard roof is weakened by hydraulic fracturing, it needs to be drilled and then cut. construction efficiency.

In view of the above problems, the present invention provides a hydraulic fracturing weakened hard roof drilling device to improve the efficiency of hard roof drilling.

Contents of the invention

In order to achieve the above object, the present invention provides the following technical solutions: a hydraulic fracturing weakened hard roof drilling device, which includes an outer drill string, an inner drill string, a front drill bit, a reaming drill edge, a connecting seat and a swing drive mechanism, wherein the The inner drill string is sleeved in the hollow cavity in the outer drill string, and a cavity is provided between the outer wall of the inner drill string and the inner wall of the outer drill string, and the central axis of the inner drill string is set There is a cooling medium hole, the front end of the inner drill string is provided with the front drill bit, the front end of the outer drill string is provided with a reaming drill edge, and the front end of the inner drill string protrudes from the front end of the outer drill string, And an elastic hinge support is arranged between the inner wall of the front end of the inner drill string and the outer drill string, the rear end of the outer drill string extends into the connecting seat, and the rear end of the outer drill string is connected to the inner wall of the outer drill string. The connecting seats are supported by bearings, the swing driving mechanism is arranged between the rear end of the inner drill string and the rear end of the outer drill string, and the connecting seat is connected to the output end of the drilling equipment through transmission. And the drilling equipment can drive the outer drill string and the inner drill string to rotate in opposite directions, and when the outer rotating column and the inner rotating column rotate relative to each other, the oscillating drive The mechanism can make the inner drill string swing at a certain angle with the elastic hinge support as the fulcrum.

Further, preferably, the swinging angle range of the inner drill string is ±β, wherein β is the angle between the axis of the inner drill string and the axis of the outer rotating column, and the size of β is 2-10° .

Further, as a preference, the rear end of the outer drill string is integrally provided with a drive ring seat with an outer diameter larger than that of the outer drill string, the swing driving mechanism is arranged in the drive ring seat, and the drive ring seat is far away from the One end of the outer drill string is provided with an outer transmission tooth that is in transmission connection with the drilling equipment; Internal drive teeth.

Further, as a preference, the outer circumference of the rear end of the connecting seat is provided with a connecting thread, and the connecting seat is fixedly connected with the drilling equipment by means of the connecting thread, and the bearing seat between the connecting seat and the outer drill string The inner end and the outer end are respectively provided with an inner sealing cover and an outer sealing cover.

Further, as a preference, the swing drive mechanism includes an eccentric hole seat, a drive rod, and a rolling power shaft, wherein the eccentric hole seat is coaxially arranged in the cylindrical cavity of the transmission ring seat, and the cylinder of the transmission ring seat The cavity is set coaxially with the outer drill string, the eccentric hole seat is provided with an eccentric hole, and the diameter of the eccentric hole is larger than the diameter of the inner drill string, and the rear end of the eccentric hole seat is provided with an eccentric A guide drive groove with concentric holes, a rolling power shaft is guided in the guide drive groove, and the rolling power shaft is fixedly connected with one end of the drive rod. The drive rod is an L-shaped rod, and the other end of the drive rod One end is fixedly connected to the outer peripheral wall of the inner drill string, and the other end of the driving rod extends along the radial direction of the inner drill string, when between the inner drill string and the outer drill string During relative rotation, the driving rod can drive the inner drill string to swing in the eccentric hole.

Further, preferably, the elastic hinge support provided between the inner drill string and the front end inner wall of the outer drill string includes a universal hinge and a spring, wherein the spring is arranged between the outer wall of the inner drill string and the inner wall of the outer drill string. between the outer walls of the inner drill string.

Further, preferably, the front drill bit includes a front drill edge and a rear drill edge, wherein the front drill edge has a conical structure, and the rear drill edges are arranged in multiple groups from front to back, and the rear drill edge at the front The outer diameter of the edge is smaller than the outer diameter of the rear drill edge at the rear.

Further, preferably, the sidewalls of the front drill edge and the rear drill edge are provided with cooling medium spray holes connected to the cooling medium holes.

Further, preferably, the rolling power shaft is made of wear-resistant material.

Further, preferably, the rolling power shaft can only rotate around the center of the guiding driving groove in the guiding driving groove, and the rolling power shaft and the guiding driving groove cannot move in the axial direction of the outer drill string set up.

Compared with prior art, the beneficial effect of the present invention is:

The hydraulic fracturing weakened hard roof drilling device of the present invention can conveniently realize the drilling of the hard roof when drilling the hard roof, and the drilling efficiency is high. Reaming can efficiently drill the hard roof, and consumes relatively less drill bits. The drilling method of inner drill pipe swing and rotation can quickly drill the hard roof, and the axial force of the drilling can be reduced. It is much lower, which is convenient for the subsequent implementation of hydraulic fracturing to weaken the hard roof. The invention has simple structure and reasonable transmission, which greatly ensures the drilling efficiency of the hard roof, and at the same time, improves the service life of the drill bit.

Description of drawings

Fig. 1 is a structural schematic diagram of a hydraulic fracturing weakened hard roof drilling device of the present invention;

Fig. 2 is a schematic structural diagram of the front view of the position of the swing drive assembly of the hydraulic fracturing weakened hard roof drilling device of the present invention;

Fig. 3 is a side sectional structural schematic diagram of the swing driving assembly of the hydraulic fracturing weakened hard roof drilling device of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to Fig. 1-3, the present invention provides a kind of technical solution: hydraulic fracturing weakened hard roof drilling device, which includes outer drill string 1, inner drill string 2, front drill bit, reaming drill edge, connecting seat 12 and swing The driving mechanism, wherein the inner drill string 2 is sheathed in the hollow cavity in the outer drill string 1, and a cavity is provided between the outer wall of the inner drill string 2 and the inner wall of the outer drill string 1 9. The central axis of the inner drill string is provided with a cooling medium hole 8, the front end of the inner drill string 2 is provided with the front drill bit, and the front end of the outer drill string is provided with a reaming drill edge. The front end of the column protrudes from the front end of the outer drill string, and an elastic hinge support is arranged between the inner drill string and the inner wall of the front end of the outer drill string, and the rear end of the outer drill string extends into the connection In the seat 12, and the rear end of the outer drill string and the connection seat are supported by bearings, and the swing driving mechanism is arranged between the rear end of the inner drill string and the rear end of the outer drill string, The connecting seat is drive-connected to the output end of the drilling equipment, and the drilling equipment can drive the outer drill string and the inner drill string to rotate in opposite directions, and the outer rotating column and the When the inner rotating columns rotate relative to each other, the swing driving mechanism can make the inner drill string swing at a certain angle with the elastic hinge support as the fulcrum.

In this embodiment, the swing angle range of the inner drill string 2 is ±β, where β is the angle between the axis of the inner drill string and the axis of the outer rotating column, and the size of β is 2- 10°.

As a preferred embodiment, the rear end of the outer drill string 1 is integrally provided with a transmission ring seat 21 whose outer diameter is larger than that of the outer drill string, the swing driving mechanism is arranged in the transmission ring seat 21, and the transmission The end of the ring seat 21 away from the outer drill string is provided with an outer transmission tooth 17 which is in transmission connection with the drilling equipment, and the rear end of the inner drill string 2 is provided with a transmission protrusion, and the end of the transmission protrusion is provided There are inner drive teeth 18 connected with the drilling equipment drive.

Wherein, the outer circumference of the rear end of the connecting seat 12 is provided with a connecting thread 13, and the connecting seat 12 is fixedly connected with the drilling equipment by means of the connecting thread, and the bearing seat between the connecting seat 12 and the outer drill string The inner and outer ends of 11 are respectively provided with an inner sealing cover 14 and an outer sealing cover 10 .

As a better embodiment, the swing drive mechanism includes an eccentric hole seat 15, a drive rod 16, and a rolling power shaft 22, wherein the eccentric hole seat 15 is coaxially arranged in the cylindrical cavity 19 of the drive ring seat 21 , the cylindrical cavity of the transmission ring seat 21 is set coaxially with the outer drill string, the eccentric hole seat is provided with an eccentric hole 20, and the diameter of the eccentric hole is larger than the diameter of the inner drill string 2, so The rear end of the eccentric hole seat 15 is provided with a guiding drive groove 23 concentric with the eccentric hole, and a rolling power shaft 22 is guided in the guiding driving groove 23, and the rolling power shaft 22 is fixed to one end of the driving rod 16. connected, the driving rod 16 is an L-shaped rod, the other end of the driving rod is fixedly connected to the outer peripheral wall of the inner drill string, and the other end of the driving rod 16 runs along the inner drill string 2 The radial direction extends, and when the inner drill string and the outer drill string are relatively rotated, the driving rod can drive the inner drill string to swing in the eccentric hole.

The elastic hinge support provided between the inner drill string 2 and the front end inner wall of the outer drill string 1 includes a universal hinge 5 and a spring 6, wherein the spring 6 is arranged between the outer wall of the inner drill string and the inner wall of the outer drill string 1. between the outer walls of the inner drill string. The front drill bit includes a front drill edge 3 and a rear drill edge 4, wherein the front drill edge 3 is a conical structure, and the rear drill edge 4 is a plurality of groups arranged from front to back, and the rear drill edge at the front The outer diameter is smaller than the outer diameter of the rear drill edge at the rear. The sidewalls of the front drill edge and the rear drill edge are provided with cooling medium spray holes connected to the cooling medium holes. The rolling power shaft is made of wear-resistant material. The rolling power shaft can only rotate around the center of the guiding driving groove in the guiding driving groove, and the rolling power shaft and the guiding driving groove are not movable in the axial direction of the outer drill string.

The hydraulic fracturing weakened hard roof drilling device of the present invention can conveniently realize the drilling of the hard roof when drilling the hard roof, and the drilling efficiency is high. Reaming can efficiently drill the hard roof, and consumes relatively less drill bits. The drilling method of inner drill pipe swing and rotation can quickly drill the hard roof, and the axial force of the drilling can be reduced. It is much lower, which is convenient for the subsequent implementation of hydraulic fracturing to weaken the hard roof. The invention has simple structure and reasonable transmission, which greatly ensures the drilling efficiency of the hard roof, and at the same time, improves the service life of the drill bit.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (6)

1. The hydraulic fracturing weakened hard roof drilling device is characterized in that it includes an outer drill string, an inner drill string, a front drill bit, a reaming drill, a connecting seat and a swing drive mechanism, wherein the inner drill string is sleeved In the hollow cavity in the outer drill string, a cavity is provided between the outer wall of the inner drill string and the inner wall of the outer drill string, and the central axis of the inner drill string is provided with a cooling medium hole, so The front end of the inner drill string is provided with the front drill bit, the front end of the outer drill string is provided with a reaming drill edge, the front end of the inner drill string protrudes from the front end of the outer drill string, and the inner drill string An elastic hinge support is arranged between the inner wall of the front end of the outer drill string, the rear end of the outer drill string extends into the connecting seat, and a bearing is used between the rear end of the outer drill string and the connecting seat Supporting arrangement, the swing driving mechanism is arranged between the rear end of the inner drill string and the rear end of the outer drill string, the connecting seat is connected to the output end of the drilling equipment, and the drilling equipment It can drive the outer drill string and the inner drill string to rotate in opposite directions, and when the outer drill string and the inner drill string rotate relative to each other, the swing driving mechanism can make the inner drill string The drill string swings at a certain angle with the elastic hinge support as the fulcrum; The oscillating drive mechanism includes an eccentric hole seat, a drive rod, and a rolling power shaft, wherein the eccentric hole seat is coaxially arranged in the cylindrical cavity of the transmission ring seat, and the cylindrical cavity of the transmission ring seat and the outer drill string Coaxial arrangement, the eccentric hole seat is provided with an eccentric hole, and the diameter of the eccentric hole is larger than the diameter of the inner drill string, and the rear end of the eccentric hole seat is provided with a guide driving groove concentric with the eccentric hole, A rolling power shaft is provided as a guide in the guide driving groove, and the rolling power shaft is fixedly connected to one end of the driving rod, the driving rod is an L-shaped rod, and the other end of the driving rod is fixedly connected to the inner on the outer peripheral wall of the drill string, and the other end of the drive rod extends along the radial direction of the inner drill string, and when the inner drill string and the outer drill string rotate relative to each other, the drive rod The rod can drive the inner drill string to swing in the eccentric hole; The elastic hinge support provided between the inner drill string and the inner wall of the front end of the outer drill string includes a universal hinge and a spring, wherein the spring is arranged on the outer wall of the inner drill string and the outer drill string between the inner walls of The front drill bit includes a front drill edge and a rear drill edge, wherein the front drill edge is a conical structure, and the rear drill edges are arranged in multiple groups from front to back, and the outer diameter of the rear drill edge at the front is less than the outer diameter of the rear drill edge at the rear; The sidewalls of the front drill edge and the rear drill edge are provided with cooling medium spray holes connected to the cooling medium holes. 2. The hydraulic fracturing weakened hard roof drilling device according to claim 1, characterized in that: the swing angle range of the inner drill string is ±β, where β is the axis of the inner drill string and the outer The included angle between the axes of the drill string, β, is 2-10°. 3. The hydraulic fracturing weakened hard roof drilling device according to claim 1, characterized in that: the rear end of the outer drill string is integrally provided with a drive ring seat whose outer diameter is larger than that of the outer drill string, and the oscillating drive mechanism It is arranged in the drive ring seat, and the end of the drive ring seat far away from the outer drill string is provided with an outer drive tooth that is in transmission connection with the drilling equipment, and the rear end of the inner drill string is provided with a drive boss , the end of the transmission boss is provided with an inner transmission tooth that is in transmission connection with the drilling equipment. 4. The hydraulic fracturing weakened hard roof drilling device according to claim 3, characterized in that: the outer circumference of the rear end of the connecting seat is provided with a connecting thread, and the connecting seat is fixed by the connecting thread and the thread of the drilling equipment connection, the inner end and outer end of the bearing seat between the connecting seat and the outer drill string are respectively provided with an inner sealing cover and an outer sealing cover. 5. The hydraulic fracturing weakened hard roof drilling device according to claim 1, characterized in that: the rolling power shaft is made of wear-resistant material. 6. The hydraulic fracturing weakened hard roof drilling device according to claim 1, characterized in that: the rolling power shaft can only rotate around the center of the guiding driving groove in the guiding driving groove, and the rolling power The shaft and the guide drive groove are arranged immovably in the axial direction of the outer drill string.