CN210264501U

CN210264501U - High-efficient anticreep is pressed rotatory and is strikeed screw rod drilling tool

Info

Publication number: CN210264501U
Application number: CN201921274322.XU
Authority: CN
Inventors: 朱晓峰
Original assignee: Weifang Zhongyuan Heavy Industry Technology Co ltd
Current assignee: Weifang Zhongyuan Heavy Industry Technology Co ltd
Priority date: 2019-08-07
Filing date: 2019-08-07
Publication date: 2020-04-07
Anticipated expiration: 2029-08-07

Abstract

The utility model relates to an oil field drilling equipment technical field, specifically speaking relates to a rotatory impact screw rod drilling tool of high-efficient anticreep pressure. The drilling machine comprises a drill rod and a drill bit, wherein a transmission shaft is arranged in the drill rod, and the tail end of the drill bit is assembled on the bottom end of the transmission shaft through a drill bit connector; a rotary hammering device is assembled in the lower end of the transmission shaft and is positioned between the bottom port of the inner hole of the transmission shaft and the tail end port of the drill bit connecting body; the rotary hammering device comprises a hammer body and a rotary sleeve body. The utility model discloses one or more vibration phenomena that probably appear when not only having eliminated the drill bit motion in the pit makes the moment of torsion of whole drilling string remain stable and balanced, turns round the fluid energy conversion of drilling fluid to, high frequency, even stable mechanical impact energy and direct transmission give the PDC drill bit, makes drill bit and shaft bottom remain the continuity all the time, in addition, has greatly improved the mechanical drilling speed, has eliminated the stick-slip phenomenon well to the life-span of extension drill bit and other drilling tools.

Description

High-efficient anticreep is pressed rotatory and is strikeed screw rod drilling tool

Technical Field

The utility model relates to an oil field drilling equipment technical field, specifically speaking relates to a rotatory impact screw rod drilling tool of high-efficient anticreep pressure.

Background

Downhole, PDC bits are extremely chaotic in their motion, including lateral, longitudinal, and torsional vibrations and combinations thereof, and downhole vibrations can damage individual PDC cutters, resulting in reduced bit life, as well as producing irregular wellbores, reducing well bore quality. In addition, stick-slip phenomenon can also lead to the PDC drill bit to be damaged in advance, specifically speaking, when the drill bit just drilled into the stratum, torsion is not enough, the drill bit can pause temporarily, the drill bit pauses motionless, but the carousel is rotating, so the energy of moment of torsion just accumulates on whole drilling rod, makes the drilling rod be in the distortion state, after the torsion stress on the drilling rod releases suddenly, the drill bit accelerates suddenly, and the drill bit rotational speed accelerates suddenly, causes the drill bit to damage very easily. Therefore, how to eliminate one or more phenomena of transverse, longitudinal and torsional vibration which may occur during the movement of the downhole drill bit, so as to keep the torque of the whole drill rod stable and balanced, and how to eliminate the phenomenon of drill slip, so as to prolong the service life of the drill bit, becomes a technical problem to be solved in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rotatory impact screw rod drilling tool of high-efficient anticreep pressure to solve above-mentioned technical problem.

In order to solve the above problems, the utility model adopts the following technical scheme:

a high-efficiency anti-decompression rotary impact screw drill comprises a drill rod and a drill bit, wherein a transmission shaft is arranged in the drill rod, and the tail end of the drill bit is assembled at the bottom end of the transmission shaft through a drill bit connector; an axial transmission shaft inner hole is formed in the transmission shaft; the method is characterized in that: a rotary hammering device is assembled in the lower end of the transmission shaft and is positioned between the bottom port of the inner hole of the transmission shaft and the tail end port of the drill bit connecting body; the rotary hammering device comprises a hammer body and a rotary sleeve body, wherein the hammer body comprises a hollow cylindrical hammer sleeve and at least two impact hammers axially and uniformly arranged on the outer wall of the hammer sleeve, and a first well fluid through hole and a second well fluid through hole are respectively formed between the left side and the right side of each impact hammer and the hammer sleeve; the inner wall of the cavity at the lower end of the transmission shaft is uniformly provided with at least two axial arc grooves, the radian of each arc groove is larger than that of each impact hammer, the hammer body is axially assembled in the cavity at the lower end of the transmission shaft, and each impact hammer is correspondingly inserted in each arc groove one by one; the rotary sleeve body is axially assembled in a central hole of the hammer sleeve and comprises a circular wear-resistant sealing base and a rotary sleeve fixed at the top of the wear-resistant sealing base; the center hole of the wear-resistant sealing base is assembled on the tail end of the drill bit connector through a bearing, and a pressure regulating sleeve is assembled in the tail end of the drill bit connector; a liquid through hole communicated with the inner cavity of the drill bit connector is arranged below the wear-resistant sealing base; a plurality of liquid discharge holes communicated with the liquid through holes are formed in the positions, close to the outer circumference, of the wear-resistant sealing base, and one-way valves are installed in the liquid discharge holes; the rotary sleeve is integrally cylindrical, the top end of the rotary sleeve is butted with the inner hole of the transmission shaft, and the bottom end of the rotary sleeve is communicated with the tail end opening of the drill bit connector; the outer wall of the rotary sleeve is provided with a plurality of liquid discharge through grooves which can be communicated with the liquid discharge holes; two rotary sleeve liquid outlet holes are symmetrically formed in the rotary sleeve, and a plurality of rotary sleeve blades are uniformly arranged on the inner wall of the rotary sleeve.

Furthermore, the aperture of the inner hole of the transmission shaft is smaller than the inner diameter of the pressure regulating sleeve, and the pressure difference of well fluid between the lower port of the inner hole of the transmission shaft and the pressure regulating sleeve is 2-3 MPa.

Has the advantages that: compared with the prior art, the utility model discloses a bottom mouth at the transmission shaft hole is equipped with rotatory hammering device with the tail end mouth of drill bit connector, the extra impact force that is provided by rotatory hammering device has changed the function of PDC drill bit completely, one or more vibration phenomenon that probably appears when not only having eliminated the drill bit motion in the pit, the moment of torsion that makes whole drilling string remains stable and balanced, turn round the fluid energy conversion of drilling fluid to ingeniously, the high frequency, even stable mechanical impact energy directly transmits for the PDC drill bit, make drill bit and shaft bottom remain the continuity all the time, and, mechanical drilling speed has greatly been improved, stick-slip phenomenon has been eliminated well, thereby the life-span of extension drill bit and other drilling tools.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a view a-a of fig. 2.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the following detailed description.

Example (b):

referring to fig. 1-3, the high-efficiency anti-decompression rotary percussion screw drill according to the present embodiment includes a drill rod with a transmission shaft 3 mounted therein and a drill bit 15, wherein a tail end of the drill bit 15 is mounted on a bottom end of the transmission shaft 3 through a drill bit connector 16; an axial transmission shaft inner hole 13 is formed in the transmission shaft 3.

The lower end of the transmission shaft 3 is internally provided with a rotary hammering device which is positioned between the bottom port of the transmission shaft inner hole 13 and the tail end port of the drill bit connecting body 16.

The rotary hammering device comprises a hammer body and a rotary sleeve body, the hammer body comprises a hollow hammer sleeve 2 which is cylindrical and two impact hammers 21 which are axially arranged on the outer wall of the hammer sleeve 2, the two impact hammers 21 are symmetrical to each other, and a first well fluid through hole 22 and a second well fluid through hole 23 are respectively arranged between the left side and the right side of each impact hammer 21 and the hammer sleeve 2. Two axial arc grooves 5 are symmetrically arranged on the inner wall of the lower end cavity of the transmission shaft 3, the radian of each arc groove 5 is larger than that of each impact hammer 21, the hammer body is axially assembled in the cavity at the lower end of the transmission shaft 3, and the two impact hammers 21 are correspondingly inserted into the two arc grooves 5.

The rotating sleeve body is axially assembled in a central hole of the hammer sleeve 2 and comprises a circular wear-resistant sealing base 11 and a rotating sleeve 1 fixed at the top of the wear-resistant sealing base 11. The center hole of the abrasion-resistant sealing base 11 is assembled on the tail end of the drill bit connecting body 16 through a bearing, and the pressure regulating sleeve 12 is assembled in the tail end of the drill bit connecting body 16. When the pressure regulating sleeve 12 is designed and manufactured, the aperture of the inner hole 13 of the transmission shaft is smaller than the inner diameter of the pressure regulating sleeve 12, the inner diameter of the alloy pressure regulating sleeve 12 is designed according to the type and the displacement of a screw, and the inner diameter of the alloy pressure regulating sleeve 12 and the aperture of the inner hole 13 of the transmission shaft are generally reduced to an intermediate pressure difference, so that the pressure difference of well fluid between the low port of the inner hole 13 of the transmission shaft and the pressure regulating sleeve 12 is 2-3 MPa.

A liquid through hole 10 communicated with the inner cavity of the drill bit connector 16 is arranged below the wear-resistant sealing base 11; a plurality of liquid discharge holes 8 are formed in the positions, close to the outer circumference, of the wear-resistant sealing base 11, and one-way valves 9 are installed in the liquid discharge holes 8; the rotary sleeve 1 is integrally cylindrical, the top end of the rotary sleeve is butted with the inner hole 13 of the transmission shaft, and the bottom end of the rotary sleeve is communicated with the tail end port of the drill bit connector 16; the outer wall of the rotary sleeve 1 is provided with a plurality of liquid discharge through grooves 6 which can be communicated with liquid discharge holes 8; two rotary sleeve liquid outlet holes 4 are symmetrically formed in the rotary sleeve 1, and a plurality of rotary sleeve blades 7 are uniformly arranged on the inner wall of the rotary sleeve 1.

This embodiment high-efficient anticreep is pressed rotatory impact screw rod drilling tool during operation, drilling fluid get into the motor and do work the back and get into transmission shaft hole 13 again, get into swivel nut hole 14 again, because be equipped with spiral helicine swivel nut blade 7 on the swivel nut 1 inner wall, drilling fluid will promote swivel nut 1 rotatory in the hole of hammer bushing 2 through swivel nut blade 7 when passing through. When the rotary sleeve 1 rotates to a certain angle, the two rotary sleeve liquid outlet holes 4 are correspondingly communicated with the two first well liquid through holes 22 on the hammer sleeve 2 one by one, drilling liquid enters the first well liquid through holes 22 through the rotary sleeve liquid outlet holes 4, the hammer sleeve 2 is pushed to rotate, and the impact hammer 21 hammers the transmission shaft 3; when the hammer sleeve 2 rotates, drilling fluid in the hammer sleeve 2 and the arc-shaped groove 5 enters the fluid drainage through groove 6 through the second well fluid through hole 23 under the pushing of 2-3MPa, enters the fluid drainage hole 8 through the fluid drainage through groove 6, enters the fluid drainage hole 10 through the check valve 9, finally converges into the inner cavity of the drill bit connecting body 16, and is discharged through the fluid drainage hole in the drill bit 15.

When the rotary sleeve 1 continues to rotate to a certain angle, the two rotary sleeve liquid outlet holes 4 are communicated with the two second well liquid through holes 22 on the hammer sleeve 2 in a one-to-one correspondence manner, drilling liquid enters the second well liquid through holes 22 through the rotary sleeve liquid outlet holes 4, the hammer sleeve 2 is pushed to rotate reversely, and the impact hammer 21 hammers the transmission shaft 3 reversely; when the hammer sleeve 2 rotates, drilling fluid in the hammer sleeve 2 and the arc-shaped groove 5 enters the fluid drainage through groove 6 through the first well fluid through hole 22 under the pushing of 2-3MPa, enters the fluid drainage hole 8 through the fluid drainage through groove 6, enters the fluid drainage hole 10 through the check valve 9, finally converges into the inner cavity of the drill bit connecting body 16, and is discharged through the fluid drainage hole in the drill bit 15.

As a result, the rotary sleeve 1 continuously rotates, and the hammer 21 performs a reciprocating hammer action on the drive shaft 3. The hammering frequency of the impact hammer 21 is determined by the rotating speed of the rotating sleeve 1, and the rotating speed of the rotating sleeve 1 is determined by the helical angle of the rotating sleeve blades 7 in the rotating sleeve 1; the weight of the hammer impact of the hammer striker 21 is determined by the pressure difference between the pressure regulating sleeve 12 and the inner bore 13 of the transmission shaft.

In the high-efficiency pressure-drop-preventing rotary impact screw drill tool of the embodiment, the rotary hammering device is assembled at the bottom port of the inner hole of the transmission shaft and the tail port of the drill bit connector, the operation of the PDC drill bit can be completely changed by the additional impact force provided by the rotary hammering device, the high-frequency stable impact force of 750-, this allows the bit to cut the formation without waiting for sufficient energy to be accumulated by the torque force, and at this point, there are two forces on the PDC bit to cut the formation, one is the torque force provided by the rotary table and one is the force provided by the rotary hammering device, and the force provided by the rotary hammering device is directly applied to the bit, the torque of the drill rod is basically stable, and the torque transmitted by the drill rod can be completely used for cutting the stratum without waste. Specifically speaking, the screw drill has following characteristics:

1. the rotary hammering device is directly arranged at the joint of the transmission shaft 3 and the drill bit 15, impact force directly impacts the drill bit 15, and the mechanical rotating speed is improved. Compact structure, it is simple reasonable, the drilling fluid runner is unobstructed, does not have any rubber spare, does not have any electronic components, even the impact of rotary hammering device became invalid, it also is equivalent to a drill bit nipple joint, continues to rotate with the PDC drill bit together and does not influence and continue to bore to need not to play the drilling to this, but the performance is equivalent to getting back to the state that does not have rotary hammering device before again, does not have any other risks.

2. The rotary hammering device can greatly increase the mechanical drilling speed and the drilling guidance quality, so that the PDC drill bit can more effectively shear and crush the stratum, the mechanical drilling speed can be increased by 2-3 times and the footage can be increased by 3-4 times on the whole.

3. The greater the drilling fluid flow and velocity, the greater the impact energy generated by the rotary hammer device, and the higher the rate of penetration and frequency of impacts to the drill bit.

4. The rotary hammer device is suitable for a diamond bit because it generates stable and uniform high-frequency impact from rotation. The impact that produces can not produce the damage to the diamond coated sheet of PDC drill bit, can prolong the PDC drill bit life on the contrary, also weakens the fatigue strength of other drilling tools simultaneously, prolongs the life-span of other drilling tools.

5. Because the rotary hammering device is arranged at the lower end of the transmission shaft and is close to the position of the centralizer, the impact force sent by the rotary hammering device also acts on the outer surface of the centralizer, the probability of bonding the outer surface of the centralizer with the well wall is reduced, and the phenomenon of pressure release caused by the adhesion of the screw rod and the well wall is effectively prevented.

The technical contents not described in detail in the present invention are all known techniques.

The present invention is not limited by the above embodiments, and the description in the above embodiments and the description is only for illustrating the principle of the present invention, without departing from the spirit and scope of the present invention, the present invention can also have various changes and improvements, and these changes and improvements all fall into the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A high-efficiency anti-decompression rotary impact screw drill comprises a drill rod and a drill bit (15), wherein a transmission shaft (3) is arranged in the drill rod, and the tail end of the drill bit (15) is assembled on the bottom end of the transmission shaft (3) through a drill bit connector (16); an axial transmission shaft inner hole (13) is formed in the transmission shaft (3); the method is characterized in that: a rotary hammering device is assembled in the lower end of the transmission shaft (3), and the rotary hammering device is positioned between the bottom port of the transmission shaft inner hole (13) and the tail end port of the drill bit connecting body (16); the rotary hammering device comprises a hammer body and a rotary sleeve body, wherein the hammer body comprises a hollow cylindrical hammer sleeve (2) and at least two impact hammers (21) which are axially and uniformly arranged on the outer wall of the hammer sleeve (2), and a first well fluid through hole (22) and a second well fluid through hole (23) are respectively arranged between the left side and the right side of each impact hammer (21) and the hammer sleeve (2); the inner wall of the lower end cavity of the transmission shaft (3) is uniformly provided with at least two axial arc-shaped grooves (5), the radian of each arc-shaped groove (5) is larger than that of each impact hammer (21), the hammer body is axially assembled in the lower end cavity of the transmission shaft (3), and each impact hammer (21) is correspondingly inserted in each arc-shaped groove (5); the rotary sleeve body is axially assembled in a central hole of the hammer sleeve (2) and comprises a circular wear-resistant sealing base (11) and a rotary sleeve (1) fixed at the top of the wear-resistant sealing base (11); the center hole of the wear-resistant sealing base (11) is assembled on the tail end of the drill bit connecting body (16) through a bearing, and a pressure regulating sleeve (12) is assembled in the tail end of the drill bit connecting body (16); a liquid through hole (10) communicated with the inner cavity of the drill bit connector (16) is arranged below the wear-resistant sealing base (11); a plurality of liquid discharge holes (8) are formed in the positions, close to the outer circumference, of the wear-resistant sealing base (11), and one-way valves (9) are installed in the liquid discharge holes (8); the rotary sleeve (1) is integrally cylindrical, the top end of the rotary sleeve is butted with the inner hole (13) of the transmission shaft, and the bottom end of the rotary sleeve is communicated with the tail end opening of the drill bit connector (16); a plurality of liquid discharge through grooves (6) which can be communicated with the liquid discharge holes (8) are formed in the outer wall of the rotary sleeve (1); two rotary sleeve liquid outlet holes (4) are symmetrically formed in the rotary sleeve (1), and a plurality of rotary sleeve blades (7) are uniformly arranged on the inner wall of the rotary sleeve (1).

2. The efficient decompression-resistant rotary impact screw drill according to claim 1, wherein: the aperture of the transmission shaft inner hole (13) is smaller than the inner diameter of the pressure regulating sleeve (12), and the well fluid pressure difference between the lower port of the transmission shaft inner hole (13) and the pressure regulating sleeve (12) is 2-3 MPa.