CN114427343B - Dead zone prevention starting device of hydraulic torsion impactor - Google Patents

Abstract

The invention provides a hydraulic torsion impactor dead zone prevention starting device, which comprises: a housing; a support sleeve concentrically disposed within the housing; the torsional impactor comprises a starting reversing hammer, a torsional impact hammer and an upper seat body which are sequentially sleeved on a supporting sleeve, wherein the starting reversing hammer and the torsional impact hammer can rotate relatively, and the torsional impactor is configured to enable the torsional impact hammer to rotate back and forth under the action of pressure difference between high-pressure drilling fluid and low-pressure drilling fluid so as to generate reciprocating torsional impact; two adjusting pins which are symmetrically distributed and radially penetrate through the starting reversing hammer and the supporting sleeve, and one end part of each adjusting pin extends to the inner channel of the supporting sleeve; the end part of the torsion wrench is provided with a U-shaped through groove which can be matched with the adjusting pin; when the torsion impactor enters the dead zone position, the starting reversing hammer and the torsion impact hammer can be rotated to the limit positions through the torsion wrench, so that the torsion impactor can be started normally.

Description

Dead zone prevention starting device of hydraulic torsion impactor

Technical Field

The invention belongs to the technical field of energy exploration and development, and particularly relates to a dead zone prevention starting device of a hydraulic torsion impactor.

Background

As hydrocarbon development proceeds deeper, land shallow hydrocarbon resources begin to deplete gradually, and exploration targets turn gradually into deep formations. The higher overburden pressure of the deep formation results in a multiple increase in rock hardness, compressive shear strength, and abrasiveness, resulting in a dramatic drop in the rate of penetration of the survey tool. In recent years, PDC drill bits have gradually become main force drill bits for petroleum drilling, however, the PDC drill bits have serious 'stick-slip' phenomenon when drilling the stratum above medium hardness, so that torsional oscillation of a drill string and unstable drilling process are caused. Such severely unstable drilling can easily cause the composite cutting blades to collapse, thereby leading to failure of the PDC bit, and also can easily trip the bit, thereby inducing downhole accidents.

In the prior art, in order to effectively inhibit the stick-slip vibration of the PDC drill bit when the PDC drill bit drills into a middle hard stratum, a hydraulic torsion impactor is provided, the hydraulic torsion impactor is matched with the PDC drill bit to be used, reciprocating torque pulses are applied to the circumference of the drill bit, when the reciprocating torque pulses are overlapped with steady drilling torque of a drill string, efficient rock breaking torque can be applied to the drill bit, the stick-slip vibration of the drill bit is greatly reduced or eliminated, and therefore, the mechanical drilling speed is improved while the well quality is ensured, and the service life of the drill bit is prolonged. However, some problems remain with existing hydraulic torsional impactors. For example, the starting reversing mechanism of the hydraulic torsion impactor has a dead zone range, and the starting hammer and the reversing hammer can not be automatically started and continuously operated under the action of fluid pressure difference at any position, so that the hydraulic torsion impactor can not be ensured to be normally started.

Disclosure of Invention

Aiming at the technical problems, the invention aims to provide a dead zone prevention starting device of a hydraulic torsion impactor, which can switch a starting reversing mechanism of the hydraulic torsion impactor to an optimal starting position, so that the hydraulic torsion impactor can be ensured to be started normally.

To this end, according to the invention there is provided a hydraulic torsional impactor deadband-prevention starting device comprising: a cylindrical housing; a support sleeve concentrically disposed within the housing; the torsional impactor is arranged between the shell and the radial direction of the supporting sleeve and comprises a starting reversing hammer, a torsional impact hammer and an upper seat body which are sequentially sleeved on the supporting sleeve, the starting reversing hammer and the torsional impact hammer can rotate relatively, and the torsional impactor is configured to enable the torsional impact hammer to rotate back and forth under the action of pressure difference between high-pressure drilling fluid and low-pressure drilling fluid so as to generate reciprocating torsional impact; the two adjusting pins are symmetrically distributed and radially penetrate through the starting reversing hammer and the supporting sleeve, and one end part of each adjusting pin extends to the inner channel of the supporting sleeve; the end part of the torsion wrench is provided with a U-shaped through groove which can be matched with the adjusting pin; when the starting reversing hammer and the torsion impact hammer are positioned in the middle of the respective rotating strokes to enable the torsion impact hammer to enter the dead zone position, the torsion wrench stretches into the U-shaped through groove from the upper end of the torsion impact hammer, and the adjusting pin is clamped into the U-shaped through groove, so that the torsion wrench is rotated to drive the starting reversing hammer and the torsion impact hammer to rotate to the limit position, and the torsion impact hammer can be started normally.

In one embodiment, the torque wrench comprises a cylindrical body, wherein the outer diameter of the cylindrical body is smaller than the inner diameter of the supporting sleeve, two U-shaped through grooves which are radially and symmetrically distributed are formed in one end part of the cylindrical body, and the U-shaped through grooves extend inwards along the axial direction.

In one embodiment, the other end of the torsion wrench is provided with symmetrically distributed handles, and the handles are used for rotating the torsion wrench.

In one embodiment, the device further comprises an upper blocking cover connected to the upper end of the starting reversing hammer, and the upper blocking cover is fixedly connected with the starting reversing hammer in a plug-in mode.

In one embodiment, the upper baffle cover is provided with a plurality of first through holes uniformly distributed along the circumferential direction, the side wall of the upper end of the starting reversing hammer is provided with a plurality of second through holes uniformly distributed along the circumferential direction, and the first through holes and the second through holes correspond to each other and are used for installing the adjusting pin.

In one embodiment, two fan-shaped through grooves which are symmetrically distributed and partially extend in the circumferential direction are formed in the side wall of the supporting sleeve, and the adjusting pin sequentially penetrates through the first through hole, the second through hole and the fan-shaped through grooves.

In one embodiment, the fan-shaped through groove circumferential extension angle is equal to the maximum rotation angle of the starting reversing hammer.

In one embodiment, the adjusting pin comprises a body portion and a head portion connected to the body portion, the head portion being fixedly mounted in the first through hole, the body portion extending through the second through hole and the fan-shaped through slot.

In one embodiment, the head is provided with external threads, the first through hole is provided with internal threads, and the head is fixedly installed in the first through hole in a threaded connection mode.

In one embodiment, the body portion is an interference fit with the second through hole.

Compared with the prior art, the application has the advantages that:

According to the dead zone prevention starting device for the hydraulic torsion impactor disclosed by the invention, the starting reversing mechanism of the hydraulic torsion impactor can be switched to the optimal starting position, so that the hydraulic torsion impactor can be ensured to be started normally initially, and the internal starting reversing hammer and the torsion impact hammer can operate normally under the action of throttling pressure difference and self inertia after the hydraulic torsion impactor is started, and therefore reciprocating torsion impact is realized. The dead zone prevention starting device for the hydraulic torsion impactor is simple in structure, reliable in function and high in operability, and can effectively prevent the dead zone of the torsion impactor, so that the construction efficiency of underground drilling operation is effectively guaranteed.

Drawings

The present invention will be described below with reference to the accompanying drawings.

Fig. 1 shows the structure of a hydraulic torsion impactor dead zone prevention starting device according to the present invention.

Fig. 2 is a top view of the hydraulic torsional impactor deadband prevention device of fig. 1.

FIG. 3 shows a distribution of high and low pressure fluid regions within a hydraulic torsional impactor.

FIG. 4 is a schematic view of the hydraulic torsional impactor in a dead zone position.

Fig. 5 shows the construction of a torque wrench in the hydraulic torque impactor deadband actuation prevention device of fig. 1.

Fig. 6 shows the construction of the upper shield in the hydraulic torsional impactor deadband prevention actuation device of fig. 1.

Fig. 7 shows the construction of the support sleeve in the hydraulic torsional impactor deadband actuation prevention device of fig. 1.

Fig. 8 shows the structure of the adjusting pin in the hydraulic torsional impactor deadband actuation preventing device of fig. 1.

Fig. 9 shows the construction of a starting reverser hammer in the hydraulic torsional impactor deadband starting device of fig. 1.

Fig. 10 shows the structure of the torsional impact hammer in the hydraulic torsional impactor deadband prevention starting device shown in fig. 1.

Fig. 11 shows the structure of the upper housing in the hydraulic torsional impactor deadband prevention starting device of fig. 1.

In the present application, all of the figures are schematic drawings which are intended to illustrate the principles of the application only and are not to scale.

Detailed Description

The invention is described below with reference to the accompanying drawings.

According to the present invention, the hydraulic torque impactor dead zone prevention device 100 includes a cylindrical housing 1, a support sleeve 2 concentrically arranged inside the housing 1, a torque impactor disposed between the housing 1 and the radial direction of the support sleeve 2, and a torque wrench 7. As shown in fig. 1 to 4, the hydraulic torsional impactor comprises a starting reversing hammer 3, a torsional impact hammer 4 and an upper seat body 5 which are sequentially sleeved on a supporting sleeve 2, wherein the starting reversing hammer 3 and the torsional impact hammer 4 can relatively rotate, and the hydraulic torsional impactor is configured to enable the torsional impact hammer 4 to rotate back and forth under the action of pressure difference between high-pressure drilling fluid and low-pressure drilling fluid, so that reciprocating torsional impact is generated. During drilling operations, the hydraulic torsional impactor enters a dead zone position when the start-up reversing hammer 3 and the torsional impact hammer 4 are in a positive intermediate position of their respective rotational strokes. Fig. 4 shows the relative position of the torsional impact hammer 4 which activates the reversing hammer 3 when the hydraulic torsional impactor is in the dead zone position. The torque wrench 7 is configured to extend into the hydraulic torque impactor and rotate the starting reversing hammer 3 and the torque impact hammer 4 to the limit positions by rotating, so that the hydraulic torque impactor is in the optimal starting position, and the hydraulic torque impactor can be started normally. Thus, a hydraulic torsion impactor dead zone prevention is realized.

In the present application, it should be noted that the hydraulic torsional impactor is an auxiliary tool for assisting a downhole drilling tool to enhance the performance of the drilling tool. The aid may be found, for example, in chinese patent application 201910641936.5 entitled "a drilling acceleration tool" filed by the same applicant on date 2019, 7, and 16, which is incorporated herein by reference in its entirety. In addition, during the drilling process, an end of the hydraulic torsional impactor anti-dead-zone starting device according to the present application into which drilling fluid enters is defined as an upper end or the like, and an end of the hydraulic torsional impactor anti-dead-zone starting device according to the present application out of which drilling fluid exits is defined as a lower end or the like.

Fig. 5 shows the structure of the torque wrench 7. As shown in fig. 5, the torque wrench 7 includes a cylindrical body 72. The outer diameter of the cylindrical body 72 is set smaller than the inner diameter of the support sleeve 2. At one end (right end in fig. 5) of the cylindrical body 72, two radially symmetrically distributed U-shaped through grooves 71 are provided, and the U-shaped through grooves 71 are provided to extend axially inward from the end of the cylindrical body 72. The function of the U-shaped through groove 71 will be described below.

The other end (left end in fig. 5) of the cylindrical body 72 is provided with handles 73 symmetrically distributed. The handle 73 is provided outside the side wall near the end of the cylindrical body 72. The handle 73 is used to rotate the torque wrench 7.

According to the invention, the hydraulic torsional impactor deadband actuation prevention device 100 also includes an adjustment pin 6. The hydraulic torsional impactor dead zone prevention starting device 100 comprises two adjusting pins 6, and the two adjusting pins 6 are radially symmetrically arranged. An adjusting pin 6 is mounted in the hydraulic torsional impactor through the torsional impact hammer 4, the starting reversing hammer 3 and the support sleeve 2. The axially inner end of the adjustment pin 6 extends into the inner channel of the support sleeve 2, and the adjustment pin 6 extends a part of the length in the radial direction towards the inner channel of the support sleeve 2. When the hydraulic torque impactor enters the dead zone, the torque wrench 7 is extended into the internal channel of the support sleeve 2, the U-shaped through groove 71 at the end part of the torque wrench 7 is clamped with the part of the adjusting pin 6 extending to the internal channel of the support sleeve 2, and then the handle 73 of the torque wrench 7 is rotated to rotate the torque wrench 7, and the starting reversing hammer 3 and the torque impact hammer 4 are driven to rotate to the limit positions, so that the hydraulic torque impactor can be started normally. Thereby, the position adjustment of the starting reversing hammer 3 and the torsional impact hammer 4 is achieved by means of the torque wrench 7 and the adjusting pin 6.

According to the invention, the hydraulic torsional impactor deadband actuation prevention device 100 also includes an upper shield 8. The upper baffle cover 8 is connected to the upper end of the starting reversing hammer 3. In one embodiment, the upper blocking cover 8 is connected to the starting reversing hammer 3 by means of a plug-in connection. As shown in fig. 6, the upper cover 8 is provided with a plurality of first through holes 81 uniformly distributed in the circumferential direction. Meanwhile, a plurality of second through holes 31 are uniformly distributed along the circumferential direction on the side wall of the upper end of the starting reversing hammer 3, and the first through holes 81 correspond to the second through holes 31. When the upper shield 8 is mounted to the end of the starting reversing hammer 3, the first through hole 81 and the second through hole 31 are aligned for mounting the adjusting pin 6.

As shown in fig. 7, the support sleeve 2 is configured to include a cylindrical support sleeve body 23 and a connection portion 24 connected to the support sleeve body. Cutting slits 25 are uniformly distributed on the side wall of the supporting sleeve body 23 and are used for overflowing high-pressure drilling fluid. A plurality of inclined through holes 22 which are uniformly distributed in the circumferential direction are arranged at the joint of the supporting sleeve body 23 and the connecting part 24, and the inclined through holes 22 form a supporting sleeve low-pressure fluid flow passage. In this embodiment, the support sleeve 2 is a sand control support sleeve for sand control. Two fan-shaped through grooves 21 which are radially and symmetrically distributed are arranged on the side wall of the supporting sleeve body 23. The fan-shaped through groove 21 is provided in a side wall region near the upper end (left end in fig. 7) of the support sleeve 2. The fan-shaped through groove 21 is used for providing a movement space for the torque wrench 7 to drive the adjusting pin 6 to rotate. The fan-shaped through groove 21 is provided to extend partially in the circumferential direction, and the angle of the circumferential extension of the fan-shaped through groove 21 is equal to the maximum rotation angle of the starting-up reversing hammer 3. The adjusting pin 6 extends through the fan-shaped through slot 21 towards the inner channel of the support sleeve 2.

Fig. 8 shows the structure of the adjusting pin 6. As shown in fig. 8, the adjustment pin 6 includes a body portion 61 and a head portion 62 connected to the body portion 61. The body portion 61 and the head portion 62 are each configured in a cylindrical shape. The adjusting pin 6 penetrates through the upper baffle cover 8, the starting reversing hammer 3 and the supporting sleeve 2 in sequence along the radial direction, the head 62 is arranged in the first through hole 81 of the upper baffle cover 8, and the body part 61 penetrates through the second through hole 31 of the starting reversing hammer 3 and the fan-shaped through groove 21 of the supporting sleeve 2 in sequence. In one embodiment, external threads are provided on the outer peripheral surface of the head 62 of the adjustment pin 6. Meanwhile, an internal thread capable of being matched with the external thread of the head 62 is provided in the first through hole 81 on the upper shield cover 8. The head 62 of the adjusting pin 6 is fixedly mounted in a first through hole 81 in the upper cover 8 by means of a threaded connection. And, the body portion 61 of the adjustment pin 6 is interference-fitted with the second through hole 31 of the starting-reversing hammer 3.

Fig. 9 shows the structure of the starting-up reversing hammer 3. As shown in fig. 9, the starting-reversing hammer 3 has a hollow cylindrical shape. Two axially extending latching grooves 32 are provided radially opposite the outer peripheral surface of the starting-reversing hammer 3. An axially extending starting reversing hammer low-pressure channel 3D is arranged on the outer surface of the starting reversing hammer 3 and positioned on two circumferential sides of the clamping groove 32. At the same time, the starting-reversing hammer 3 is also provided with starting-reversing-hammer high-pressure passages 3G which are circumferentially spaced apart from each other and penetrate through the side walls of the starting-reversing hammer 3, the starting-reversing-hammer high-pressure passages 3G being circumferentially located between radially opposite catching grooves 32 while being partially extended and spaced apart in the axial direction. In the embodiment shown in fig. 9, eight starting-reversing-hammer high-pressure channels 3G are provided on the side walls of the starting reversing hammer 3. The starting reversing hammer 3 is sleeved on the supporting sleeve 2, the lower end face of the starting reversing hammer 3 is in contact with the upper end face of the connecting part of the supporting sleeve 2, and the starting reversing hammer low-pressure channel 3D is communicated with the inclined through hole 22 on the supporting sleeve 2, so that the starting reversing hammer low-pressure channel 3D is communicated with low-pressure drilling fluid through the inclined through hole 22.

Fig. 10 shows the structure of the torsional impact hammer 4. The torsional impact hammer 4 is configured in a substantially hollow cylinder shape. Two radially inward and axially extending limit ribs 41 are symmetrically arranged on the inner surface of the torsion impact hammer 4 in a radial direction, and the limit ribs 41 are correspondingly inserted into the clamping grooves 32 of the starting reversing hammer 3. The circumferential width of the limit rib 41 is smaller than the circumferential width of the clamping groove 32. The limit ribs 41 are rotatable in the corresponding clamping grooves 32 to limit the relative rotation angle of the starting reversing hammer 3 and the torsion impact hammer 4, and the starting reversing hammer 3 is driven to rotate through the engagement with the side walls of the clamping grooves 32. Radially opposite the outer surface of the torsional impact hammer 4, there are provided fan-shaped projections 42 which are spaced apart from the stopper ribs 41 by 90 degrees in the circumferential direction. The side end surface of the fan-shaped bulge 42 is used as an impact surface for driving the torsion impact hammer 4 to rotate under the action of the pressure difference of high and low pressure drilling fluid.

As shown in fig. 10, the impact flow distribution channels 43 are provided on both circumferential sides of the fan-shaped projection 42, and the impact flow distribution channels 43 extend partially in the axial direction and penetrate through the side walls of the torsional impact hammer 4. The two sides of the limit rib 41 in the circumferential direction are provided with reversing flow distribution channels 44, and the reversing flow distribution channels 44 extend along the axial direction and penetrate through the side wall of the torsion impact hammer 4. In one embodiment, the impingement distribution channels 43 and the reversing distribution channels 44 are each arranged in axially spaced apart distribution. The axial positions of the impact distribution channel 43 and the direction change distribution channel 44 correspond to the axial positions of the starting direction change hammer high pressure channel 3G on the starting direction change hammer 3.

Fig. 11 shows the structure of the upper housing 5. The upper seat body 5 is configured in a cylindrical shape, and two radial protrusions are provided on the inner wall of the upper seat body 5 radially opposite to each other. Radial projections in the upper housing 5 are respectively installed between the fan-shaped projections 42 of the torsional impact hammer 4. Thereby, two first and two second circumferential liquid chambers are formed in the circumferential direction between the upper housing 5 and the side end surfaces of the torsional impact hammer 4 at the fan-shaped projections 42 and the radial projections. The first circumferential liquid cavity and the second circumferential liquid cavity are distributed at intervals in the circumferential direction and are axially symmetrically distributed. The first circumferential liquid cavity and the second circumferential liquid cavity can be respectively communicated with high-pressure drilling liquid and low-pressure drilling liquid to respectively serve as a high-pressure liquid inlet cavity and a low-pressure liquid outlet cavity, so that the fan-shaped protrusions 42 of the torsion impact hammer 4 can rotate under the action of pressure difference between the high-pressure drilling liquid and the low-pressure drilling liquid.

An upper seat body low pressure channel 5D which is concave outwards in the radial direction is arranged in the middle of the radial bulge of the upper seat body 5, and the upper seat body low pressure channel 5D extends along the axial direction. Circumferentially spaced grooves extending in the axial direction are provided radially symmetrically on the outer surface of the upper housing 5 corresponding to the radial projections, one end of the grooves extending to the axial upper end surface of the upper housing 5 and the other end terminating axially inward of the axial lower end surface of the upper housing 5. An upper seat high pressure channel 5G penetrating through the side wall of the upper seat 5 is arranged at the bottom of the groove. In one embodiment, the upper seat high pressure passages 5G are disposed at intervals in the axial direction. The upper housing high-pressure channel 5G corresponds axially to the reversing flow distribution channel 44 on the torsional impact hammer 4. The upper seat body low pressure channel 5D is communicated with low pressure drilling fluid.

In the drilling process, the hydraulic torsion impactor is arranged between the PDC drill bit and the upper drilling tool, and the power for torsion impact is provided for the drilling tool through the throttling pressure difference formed by the nozzles arranged in the hydraulic torsion impactor, the high-low pressure automatic switching of the internal hydraulic cavity pushes the torsion impact hammer 4 to reciprocate to impact the upper seat body to generate torque pulses, the torque pulses are transmitted to the PDC drill bit through the lower seat body fixedly connected with the upper seat body 5, and the shell 1 is connected with the lower seat body through a spline to transmit the normal drilling torque of the upper drilling rod. FIG. 3 shows a distribution of high and low pressure fluid regions within a hydraulic torsional impactor. When the drilling fluid flows through the internal pore canal of the hydraulic torsion impactor, the drilling fluid is divided into high and low pressure areas by the starting reversing hammer 3, the torsion impact hammer 4 and the upper seat body 5. Part of high-pressure drilling fluid enters the high-pressure channel of the starting reversing hammer through the cutting seam of the supporting sleeve 2, the other part of high-pressure drilling fluid enters the high-pressure channel 5G of the upper seat body, and the low-pressure drilling fluid is communicated with the low-pressure channel 3D of the starting reversing hammer and the low-pressure channel 5D of the upper seat body through the inclined through hole 22 at the bottom of the supporting sleeve 2. The torsion impact hammer 4 and the starting reversing hammer 3 rotate together in an accelerating way clockwise or anticlockwise under the action of the pressure difference of the high-pressure fluid area and the low-pressure fluid area, when the torsion impact hammer 4 impacts the upper seat body 5, the rotation is stopped, and the starting reversing hammer 3 continues to rotate due to inertia until impacting the limiting rib 41 inside the torsion impact hammer 4. At this time, the high and low pressure areas are switched along with the change of the flow channel, and the counter-clockwise torsion impact stage is entered to realize the reciprocating torsion impact. Therefore, after the hydraulic torsion impactor is started, the high-pressure area and the low-pressure area of the internal hydraulic cavity can be automatically switched back and forth.

When the steering hammer 3 and the torsion impact hammer 4 are started and move to the right middle position of the respective rotation strokes, the hydraulic torsion impactor is in the dead zone position and cannot be started. At this time, the upper seat high pressure channel 5G, the upper seat low pressure channel 5D, the starting reversing hammer high pressure channel 3G and the starting reversing hammer low pressure channel 3D are completely sealed by the torsional impact hammer 4, so that they cannot communicate with the impact flow distribution channel 43 and the reversing flow distribution channel 44 of the torsional impact hammer 4, and the starting reversing hammer 3 and the torsional impact hammer 4 are in a stress balance state at the same time, i.e. the hydraulic torsional impactor is in a dead zone position and cannot be started. Fig. 4 shows the relative position of the torsional impact hammer 4 which activates the reversing hammer 3 when the hydraulic torsional impactor is in the dead zone position.

Before the hydraulic torque impactor goes into the well, the torque wrench 7 can be inserted and rotated from the upper part of the hydraulic torque impactor through the hydraulic torque impactor dead zone prevention starting device 100, the U-shaped through groove 71 at the end part of the torque wrench 7 is clamped with the part of the adjusting pin 6 extending to the internal channel of the supporting sleeve 2, the torque wrench 7 is further rotated clockwise or anticlockwise through the handle 73, and the starting reversing hammer 3, the torque impact hammer 4, the upper baffle cover 8 and the adjusting pin 6 are driven to rotate together to a limit position, namely the optimal starting position of the hydraulic torque impactor, so that the hydraulic torque impactor can be started normally. Thereby, the position adjustment of the starting reversing hammer 3 and the torsional impact hammer 4 is achieved by means of the torque wrench 7 and the adjusting pin 6. Fig. 3 shows the extreme positions of the starting reversing hammer 3 and the torsional impact hammer 4 when the hydraulic torsional impactor is in the optimal starting position.

According to the hydraulic torsion impactor dead zone prevention starting device 100, a hydraulic torsion impactor starting reversing mechanism can be switched to an optimal starting position, so that the hydraulic torsion impactor can be ensured to be started normally initially, and after the hydraulic torsion impactor is started, the internal starting reversing hammer 3 and the torsion impact hammer 4 can operate normally under the action of throttling pressure difference and self inertia, so that reciprocating torsion impact is realized. The hydraulic torsion impactor dead zone prevention starting device 100 is simple in structure, reliable in function and high in operability, and can effectively realize dead zone prevention of the torsion impactor, so that the construction efficiency of underground drilling operation is effectively guaranteed.

Finally, it should be noted that the above description is only of a preferred embodiment of the invention and is not to be construed as limiting the invention in any way. Although the invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A hydraulic torsional impactor deadband prevention starting device comprising:

a cylindrical housing (1);

A support sleeve (2) concentrically arranged within the housing;

The torsional impactor is arranged between the shell and the radial direction of the supporting sleeve and comprises a starting reversing hammer (3), a torsional impact hammer (4) and an upper seat body (5) which are sequentially sleeved on the supporting sleeve, the starting reversing hammer and the torsional impact hammer can rotate relatively, and the torsional impactor is configured to enable the torsional impact hammer to rotate back and forth under the action of pressure difference between high-pressure drilling fluid and low-pressure drilling fluid so as to generate reciprocating torsional impact;

Two adjusting pins (6) which are symmetrically distributed and radially penetrate through the starting reversing hammer and the supporting sleeve, and one end part of each adjusting pin extends to an inner channel of the supporting sleeve; and

The end part of the torsion wrench (7) is provided with a U-shaped through groove (71) which can be matched with the adjusting pin;

wherein when the starting reversing hammer and the torsion impact hammer are positioned in the middle of the respective rotation strokes to enable the torsion impact device to enter a dead zone position, the torsion wrench stretches into the U-shaped through groove from the upper end of the torsion impact device, the adjusting pin is clamped into the U-shaped through groove, and then the torsion wrench is rotated to drive the starting reversing hammer and the torsion impact hammer to rotate to the limit position, so that the torsion impact device can be started normally,

The torque wrench comprises a cylindrical body (72), the outer diameter of the cylindrical body is smaller than the inner diameter of the supporting sleeve, two U-shaped through grooves which are radially and symmetrically distributed are formed in one end portion of the cylindrical body, the U-shaped through grooves extend inwards along the axial direction, handles (73) which are symmetrically distributed are arranged at the other end of the torque wrench, and the handles are used for rotating the torque wrench.

2. The hydraulic torsional impactor dead zone prevention starting device according to claim 1, further comprising an upper blocking cover (8) connected to the upper end of the starting reversing hammer, wherein the upper blocking cover is fixedly connected with the starting reversing hammer in a plug-in manner.

3. The hydraulic torsional impactor dead zone prevention starting device according to claim 2, wherein the upper baffle cover is provided with a plurality of first through holes (81) uniformly distributed along the circumferential direction, the side wall of the upper end of the starting reversing hammer is provided with a plurality of second through holes (31) uniformly distributed along the circumferential direction, and the first through holes and the second through holes correspond to each other for mounting the adjusting pin.

4. A hydraulic torsional impactor dead zone prevention starting device according to claim 3, characterized in that two fan-shaped through grooves (21) which are symmetrically distributed and partially extend in the circumferential direction are arranged on the side wall of the supporting sleeve, and the adjusting pin sequentially penetrates through the first through hole, the second through hole and the fan-shaped through grooves.

5. The hydraulic torsional impactor deadband prevention starting device of claim 4, wherein the fan-shaped through slot circumferential extension angle is equal to the maximum rotational angle of the starting and reversing hammer.

6. The hydraulic torsional impactor deadband prevention device of claim 4 or 5, wherein the adjustment pin includes a body portion (61) and a head portion (62) coupled to the body portion, the head portion fixedly mounted in the first throughbore, the body portion extending through the second throughbore and the scalloped channel.

7. The hydraulic torsional impactor dead band prevention starting device of claim 6 wherein the head is provided with external threads and the first through bore is provided with internal threads, the head being fixedly mounted in the first through bore by threaded connection.

8. The hydraulic torsional impactor deadband prevention device of claim 7, wherein the body portion is an interference fit with the second throughbore.