CN108412420B - Pulsation type composite impactor - Google Patents

Abstract

The invention provides a pulsation type composite impactor, which comprises a drill bit seat, an outer shell and an upper joint, wherein the drill bit seat comprises a base, a first boss part and a second boss part, an axial through hole is arranged in the second boss part, the lower end of a rotary flow distribution shaft is positioned in the axial through hole, and a circumferential gap is formed between the first boss part and the outer shell; the surface of the rotary flow distribution shaft is provided with a first flow distribution port and a second flow distribution port, a first through hole and a second through hole which are matched with the first flow distribution port and the second flow distribution port are arranged on the second boss part, and an axial gap is arranged between the first through hole and the outer shell. The first distributing port and the first through hole, the second distributing port and the second through hole can be periodically communicated under the driving of drilling fluid, so that the drilling fluid periodically flows into the circumferential gap and the axial gap to apply circumferential impact force and axial impact force to the drill bit seat. The invention omits the reciprocating impact hammer structure, thereby prolonging the service life of the pulsation type composite impactor.

Description

Pulsating compound impactor

Technical field

The invention relates to the technical field of petroleum exploration, and in particular to a pulsating compound impactor.

Background technique

As oil production gradually develops towards deep wells and ultra-deep wells, during the oil drilling process, apart from the necessary non-drilling time, the time spent on pure drilling accounts for more than 80% of the entire operation time. Therefore, the drilling speed of the drill bit is very important. Improvement helps reduce drilling time. The increase in mechanical penetration rate can not only improve the economic efficiency of drilling and reduce drilling costs, but also in some special cases, rapid drilling and timely sealing of special formations can be more conducive to avoiding downhole accidents. For this reason, in drilling operations of deep wells and ultra-deep wells, an impactor is generally installed on the drill bit to increase the drilling speed.

Impactors in the prior art mainly include axial impactors, torsional impactors and composite impactors. The axial impactor can produce axial impact load on the drill bit, increase the cutting depth of the cutting teeth, and improve the rock-breaking efficiency of the drill bit; however, the axial impactor will aggravate the stick-slip vibration of the drill bit. The torsional impactor can generate a torsional impact load on the drill bit and reduce the stick-slip vibration of the drill bit; however, due to the lack of drilling pressure support in the axial direction, the rock breaking efficiency is low. The compound impactor can exert axial force and torsional force on the drill bit at the same time, overcoming the shortcomings of single-directional impactors. The composite impactor in the prior art mainly includes a drill bit seat, an outer shell and an upper joint. The drill bit seat is used to connect an external drill bit. The drill bit seat is rotatably connected to the outer shell. The upper end of the outer shell is fixedly connected to the upper joint, and the upper joint is connected to the outer drill bit. The entire composite impactor rotates driven by the external drilling tools; a reciprocating impact hammer is provided in the outer shell, the lower end of the reciprocating impact hammer has a special-shaped slope, and the upper end of the drill bit seat is also provided with a corresponding special-shaped impact hammer. Inclined surface, the reciprocating impact hammer can move up and down along the axial direction of the outer shell under the impact of high-pressure drilling fluid. Through the contact with the special-shaped surface, the axial impact force of the impact hammer is converted into axial impact force and torsional impact on the drill bit seat. force, thereby applying a composite force to the drill bit.

However, due to the harsh underground environment, rock debris will enter the interior of the impactor from time to time during the construction process, making the reciprocating impact hammer of the existing technology composite impactor easier to wear, thus making the service life of the composite impactor longer. Low.

Contents of the invention

In order to overcome the above-mentioned defects of the prior art, the object of the present invention is to provide a pulsating compound impactor. The pulsating compound impactor of the present invention omits the reciprocating impact hammer structure, thereby improving the performance of the pulsating compound impactor. service life.

The invention provides a pulsating compound impactor, which includes a drill bit base, an outer shell and an upper joint. The upper end of the outer shell is fixedly connected to the upper joint, and the lower end of the outer shell is rotatably connected to the drill bit base;

The upper joint is provided with a drilling fluid flow channel, and the drilling fluid can enter the outer shell body through the drilling fluid flow channel; a rotating flow distribution shaft is provided in the outer shell body, between the rotating flow distribution shaft and the outer shell body A driving device is provided, and the driving device can drive the rotating distribution shaft to rotate when driven by drilling fluid;

The drill bit seat includes a base and a boss portion. The base is rotationally connected to the outer shell. The boss portion extends into the outer shell. The boss portion includes a first boss portion and a second boss portion. Boss portion, the first boss portion is sleeved on the outside of the second boss portion, the second boss portion is provided with an axial through hole, and the lower end of the rotating distribution shaft is located on the shaft. Into the through hole, the upper end of the first boss portion is provided with a plurality of first protrusions, the outer shell is provided with a plurality of second protrusions, and the arcs between adjacent first protrusions are is longer than the arc length of the second protrusion, thereby forming a circumferential gap between the first protrusion and the second protrusion; the surface of the rotating distribution shaft is provided with a first distribution port and a second distribution port, so The first flow distribution opening is located above the second flow distribution opening, and the second boss portion is provided with a first through hole and a second through hole that match the first flow distribution opening and the second flow distribution opening. , an axial gap is provided between the first via hole and the outer shell.

Driven by the drilling fluid, the first flow distribution port and the first through hole, and the second flow distribution port and the second through hole can be connected periodically, so that the drilling fluid flows into the circumferential gap and the axial gap, so as to The drill bit seat exerts circumferential impact force and axial impact force.

As for the pulsating compound impactor as described above, optionally, the outer shell includes an upper nipple and a lower nipple, the upper end of the upper nipple is fixedly connected to the upper joint, and the lower end of the upper nipple is connected to the upper joint. The lower sub-section is fixedly connected, and the lower end of the lower sub-section is rotationally connected to the base of the drill bit seat.

As for the pulsating compound impactor as described above, optionally, a plurality of upwardly protruding third protrusions are provided on the outer wall of the base, and the plurality of third protrusions are evenly distributed along the circumferential direction of the base. Distribution; the lower end of the lower short section is provided with a plurality of fourth protrusions for matching with the third protrusions, and the plurality of fourth protrusions are evenly distributed along the circumferential direction of the lower short section, The third protrusion and the fourth protrusion are fixed by spline connection;

A ball groove is also provided between the first boss portion and the lower sub-joint, and a plurality of balls are provided in the ball groove.

As for the pulsating compound impactor as described above, optionally, the driving device is arranged in the upper sub-section, the driving device includes a turbine rotor and a turbine stator arranged oppositely, and the turbine stator abuts against the On the inner wall of the upper nipple, the turbine rotor is fixedly connected to the rotating distribution shaft, and a liquid channel is formed between the turbine stator and the turbine rotor.

As for the pulsating compound impactor as described above, optionally, the upper end of the rotating distribution shaft is connected to a shunt end cover, and the center hole diameter of the shunt end cover is smaller than the center hole diameter of the rotating distribution shaft; the rotating A return hole is also provided on the distribution shaft, and the return hole is used to communicate the liquid channel and the rotating distribution shaft. The return hole is located below the driving device.

As for the pulsating compound impactor as described above, optionally, the upper end of the driving device is provided with a centering bearing, and the upper end of the centering bearing is provided with a compression nut; the lower end of the upper nipple is also provided with a first step The first step surface is provided with a thrust bearing.

As for the pulsating compound impactor as described above, optionally, the upper end of the second boss portion abuts against the inner wall of the upper nipple, and a second boss portion is formed on the outer surface of the second boss portion. Step surface, the second step surface is provided with a sealing end cover.

As for the pulsating compound impactor as described above, optionally, the sealed end cover includes an end cover body and a fifth protrusion provided on the end cover body, and the end cover body is provided on the second protrusion. On the platform, the lower end surface of the fifth protrusion abuts the upper end surface of the first protrusion. The fifth protrusion and the first protrusion jointly define a circumferential space and are adjacent to each other. The arc length of the fifth protrusion is equal to the arc length of the second protrusion; the second protrusion is located in the circumferential space, and the upper end of the second protrusion is clamped on the adjacent between the fifth protrusions.

For the pulsating compound impactor as described above, optionally, a fixing ring is provided above the end cover body, and the fixing ring is threadedly connected to the second boss portion to limit the sealing end cover. Moving axially, the fixed ring and the lower end of the upper nipple jointly define the axial gap.

As for the pulsating compound impactor as mentioned above, optionally, a throttle seat is also provided in the drill bit seat. The throttle seat includes a throttle seat body and a throttle seat arranged on the throttle seat body. The diameter of the raised portion of the throttle seat is smaller than the inner diameter of the rotating valve shaft, so that the raised portion of the throttle seat extends into the rotating valve shaft. The throttle seat body is provided with a raised portion. There are multiple vertical leak holes, and the plurality of leak holes are evenly arranged along the circumferential direction.

The pulsating compound impactor provided by the invention includes a drill bit base, an outer shell and an upper joint. The upper end of the outer shell is fixedly connected to the upper joint, and the lower end of the outer shell is rotatably connected to the drill bit base; the upper joint is provided with a drilling fluid flow channel. Drilling fluid can enter the outer shell body through the drilling fluid flow channel; the outer shell body is provided with a rotating distribution shaft, and a driving device is provided between the rotating distribution shaft and the outer shell. The driving device can drive the rotating distribution shaft to rotate under the driving of the drilling fluid; the drill bit holder It includes a base and a boss part. The base is rotatably connected to the outer shell. The boss part extends into the interior of the outer shell. The boss part includes a first boss part and a second boss part. The first boss part is sleeved on the second boss part. Outside the boss part, the second boss part is provided with an axial through hole, the lower end of the rotating distribution shaft is located in the axial through hole, the upper end of the first boss part is provided with a plurality of first protrusions, and the outer shell is provided with There are multiple second protrusions, and the arc length between adjacent first protrusions is greater than the arc length of the second protrusions, thereby forming a circumferential gap between the first protrusions and the second protrusions; rotating flow distribution The surface of the shaft is provided with a first flow distribution opening and a second flow distribution opening. The first flow distribution opening is located above the second flow distribution opening. The second boss portion is provided with a third flow distribution opening that is adapted to the first flow distribution opening and the second flow distribution opening. There is a first via hole and a second via hole, and an axial gap is provided between the first via hole and the outer shell. Driven by the drilling fluid, the first distribution port and the first through hole, and the second distribution port and the second through hole can be connected periodically, so that the drilling fluid periodically flows into the circumferential gap and the axial gap, so as to Apply circumferential impact force and axial impact force to the drill bit seat. The pulsating compound impactor of the present invention omits the reciprocating impact hammer structure on the premise of ensuring the application of compound impact force to the drill bit, thereby increasing the service life of the pulsating compound impactor.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without exerting creative efforts.

Figure 1 is a schematic structural diagram of a pulsating compound impactor provided by an embodiment of the present invention;

Figure 2 is a schematic structural diagram of a drill bit holder provided by an embodiment of the present invention;

Figure 3 is a schematic structural diagram of a rotating distribution shaft provided by an embodiment of the present invention;

Figure 4 is a schematic structural diagram of a lower nipple provided by an embodiment of the present invention;

Figure 5 is a schematic structural diagram of a sealing end cap provided by an embodiment of the present invention;

Figure 6A is a cross-sectional view along the A-A direction in Figure 1 in the first state;

Figure 6B is a cross-sectional view along the direction B-B in Figure 1 in the first state;

Figure 7A is a cross-sectional view along the A-A direction in Figure 1 in the second state;

FIG. 7B is a cross-sectional view along the B-B direction in FIG. 1 in the second state.

Reference signs:

100-Drill bit seat; 110-Base;

111-The third protrusion; 120-The first boss portion;

121-the first protrusion; 130-the second boss portion;

131-First via hole; 132-Second via hole;

140-ball groove; 200-outer shell;

210-upper nipple; 220-lower nipple;

221-Second protrusion; 300-Upper joint;

310-Drilling fluid flow channel; 400-Rotating flow distribution shaft;

410-the first distribution port; 420-the second distribution port;

430-return hole; 510-turbine rotor;

520-Turbine stator; 600-Split end cover;

700-righting bearing; 710-compression nut;

720-Thrust bearing; 800-Sealed end cover;

810-end cover body; 820-fifth protrusion;

830-Fixing ring; 910-Throttle seat body;

920-Throttle seat boss.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, rather than all embodiments.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention. The following embodiments and features in the embodiments may be combined with each other without conflict.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis" The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the device or device referred to. Elements must have a specific orientation, be constructed and operate in a specific orientation and therefore are not to be construed as limitations of the invention.

In the present invention, unless otherwise clearly stated and limited, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. , or integrated into one; it can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection between two elements or the interaction between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

It should be noted that in the description of the present invention, the terms "first" and "second" are only used to conveniently describe different components, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating what is indicated. The number of technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

As oil production gradually develops towards deep wells and ultra-deep wells, during the oil drilling process, apart from the necessary non-drilling time, the time spent on pure drilling accounts for more than 80% of the entire operation time. Therefore, the drilling speed of the drill bit is very important. Improvement helps reduce drilling time. The increase in mechanical penetration rate can not only improve the economic efficiency of drilling and reduce drilling costs, but also in some special cases, rapid drilling and timely sealing of special formations can be more conducive to avoiding downhole accidents. For this reason, in drilling operations of deep wells and ultra-deep wells, an impactor is generally installed on the drill bit to increase the drilling speed.

Impactors in the prior art mainly include axial impactors, torsional impactors and composite impactors. The axial impactor can produce axial impact load on the drill bit, increase the cutting depth of the cutting teeth, and improve the rock-breaking efficiency of the drill bit; however, the axial impactor will aggravate the stick-slip vibration of the drill bit. The torsional impactor can generate a torsional impact load on the drill bit and reduce the stick-slip vibration of the drill bit; however, due to the lack of drilling pressure support in the axial direction, the rock breaking efficiency is low. The compound impactor can exert axial force and torsional force on the drill bit at the same time, overcoming the shortcomings of single-directional impactors. The composite impactor in the prior art mainly includes a drill bit seat, an outer shell and an upper joint. The drill bit seat is used to connect an external drill bit. The drill bit seat is rotatably connected to the outer shell. The upper end of the outer shell is fixedly connected to the upper joint, and the upper joint is connected to the outer drill bit. The entire composite impactor rotates driven by the external drilling tools; a reciprocating impact hammer is provided in the outer shell, the lower end of the reciprocating impact hammer has a special-shaped slope, and the upper end of the drill bit seat is also provided with a corresponding special-shaped impact hammer. Inclined surface, the reciprocating impact hammer can move up and down along the axial direction of the outer shell under the impact of high-pressure drilling fluid. Through the contact of the special-shaped surface, the axial impact force of the impact hammer is converted into axial impact force and torsional impact on the drill bit seat. force, thereby applying a composite force to the drill bit.

However, due to the harsh underground environment, rock debris will enter the interior of the impactor from time to time during the construction process, making the reciprocating impact hammer of the composite impactor using the existing technology easier to wear, thus making the service life of the composite impactor longer. Low.

In order to overcome the above-mentioned defects of the prior art, the object of the present invention is to provide a pulsating compound impactor. The pulsating compound impactor of the present invention omits the reciprocating impact hammer structure, thereby improving the performance of the pulsating compound impactor. service life.

The content of the present invention will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can understand the content of the present invention in more detail.

Figure 1 is a schematic structural diagram of a pulsating compound impactor provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a drill bit holder provided by an embodiment of the present invention; Figure 3 is a rotating distribution shaft provided by an embodiment of the present invention. Figure 4 is a schematic structural diagram of a lower nipple provided by an embodiment of the present invention; Figure 5 is a schematic structural diagram of a sealing end cover provided by an embodiment of the present invention; please refer to Figures 1-5. This embodiment provides a pulsating compound impactor, which includes a drill bit base 100, an outer shell 200 and an upper joint 300. The upper end of the outer shell 200 is fixedly connected to the upper joint 300, and the lower end of the outer shell 200 is rotatably connected to the drill bit base 100;

The upper joint 300 is provided with a drilling fluid flow channel 310. The drilling fluid can enter the outer housing 200 through the drilling fluid flow channel 310; The driving device can drive the rotating distribution shaft 400 to rotate under the driving of drilling fluid;

The drill bit seat 100 includes a base 110 and a boss portion. The base 110 is rotationally connected to the outer shell 200. The boss portion extends into the interior of the outer shell 200. The boss portion includes a first boss portion 120 and a second boss portion 130. A boss part 120 is sleeved on the outside of the second boss part 130. The second boss part 130 is provided with an axial through hole. The lower end of the rotating distribution shaft 400 is located in the axial through hole. The first boss part 120 A plurality of first protrusions 121 are provided at the upper end, and a plurality of second protrusions 221 are provided in the outer shell 200, and the arc length between adjacent first protrusions 121 is greater than the arc length of the second protrusions 221, Thereby, a circumferential gap is formed between the first protrusion 121 and the second protrusion 221; the surface of the rotating distribution shaft 400 is provided with a first distribution opening 410 and a second distribution opening 420, and the first distribution opening 410 is located at the second distribution opening. Above 420, the second boss portion 130 is provided with first through holes 131 and second through holes 132 that are adapted to the first flow distribution opening 410 and the second flow distribution opening 420. The first through hole 131 is connected to the outer shell 200 There is an axial gap between them.

Driven by the drilling fluid, the first flow distribution port 410 and the first through hole 131, and the second flow distribution port 420 and the second through hole 132 can be connected periodically, so that the drilling fluid flows into the circumferential gap and the axial gap. To apply circumferential impact force and axial impact force to the drill bit seat 100 .

Specifically, in this embodiment, the drill bit seat 100 is used to connect an external drill bit, and has a tapered space for connecting the drill bit. The inner surface of the tapered space is provided with threads. The threads generally use NC50 threads. Through this thread structure The connection with the drill bit can achieve the functions of sealing and transmitting torque, driving the drill bit to cut rocks; the outer surface of the upper joint 300 is a tapered bevel, used to connect the upper drilling tool, and is provided on the outer wall of the tapered bevel. It has an external thread structure, and the impactor as a whole can keep rotating in a certain direction under the driving of external drilling tools. The outer shell 200 and the upper joint 300 are fixed through a threaded connection, and a sealing device such as a sealing ring can be provided at the connection between the two for sealing. The upper joint 300 is provided with a drilling fluid flow channel 310 along the axial direction, and the drilling fluid discharged from the external drilling tool can enter the outer housing 200 through the drilling fluid flow channel 310. The outer housing 200 is provided with a rotating distribution shaft 400, and a driving device is provided between the rotating distribution shaft 400 and the outer housing 200. The driving device can drive the rotating distribution shaft 400 to rotate when driven by the drilling fluid.

The drill bit seat 100 includes a base 110 and a boss portion. The base 110 is rotationally connected to the outer shell 200. The boss portion extends into the interior of the outer shell 200. The boss portion includes a first boss portion 120 and a second boss portion 130. A boss portion 120 is sleeved on the outside of the second boss portion 130 . The second boss portion 130 is provided with an axial through hole. The lower end of the rotating distribution shaft 400 is located in the axial through hole, that is, the lower end of the rotating distribution shaft 400 is located in the axial through hole. The lower end is provided inside the second boss 130 . The upper end of the first boss portion 120 is provided with a plurality of first protrusions 121 , and the outer shell 200 is provided with a plurality of second protrusions 221 , and the arc length between adjacent first protrusions 121 is longer than the second protrusions 121 . The arc length of the protrusion 221 is such that a circumferential gap is formed between the first protrusion 121 and the second protrusion 221; the surface of the rotating distribution shaft 400 is provided with a first distribution port 410 and a second distribution port 420. The first distribution port 410 is located above the second flow distribution opening 420. The second boss portion 130 is provided with a first through hole 131 and a second through hole 132 that are adapted to the first flow distribution opening 410 and the second flow distribution opening 420. An axial gap is provided between the hole 131 and the outer shell 200 .

As the rotating distribution shaft 400 rotates, the high-pressure drilling fluid located in the rotating distribution shaft 400 will periodically flow into the axial gap through the first distribution port 410 and the first through hole 131, thereby providing an axial direction for the drill bit base 100. Impact force; at the same time, high-pressure drilling fluid will periodically flow into the circumferential gap through the second flow distribution port 420 and the second through hole 132, thereby providing a circumferential impact force to the drill bit seat 100.

The axial impact force can produce a pulsating axial impact load on the drill bit, which increases the depth of the drill bit's cutting teeth into the rock and reduces the rock's ability to resist crushing; the circumferential impact force can produce a pulsating torsional impact load on the drill bit, increasing the impact of the drill bit on the rock. The cutting load of the rock improves the cutting state of the drill bit and suppresses the torsional vibration of the drill bit. The axial impact and torsional impact realize the three-dimensional rock breaking of the drill bit and improve the rock breaking efficiency, thereby increasing the mechanical penetration rate of hard strata and reducing the hard strata. drilling costs.

It can be found from the above description that the pulsating compound impactor of this embodiment omits the reciprocating impact hammer structure on the premise of ensuring compound impact on the drill bit, and the structure is relatively simple, thereby increasing the service life of the pulsating compound impactor. .

Further, the outer shell 200 includes an upper nipple 210 and a lower nipple 220. The upper end of the upper nipple 210 is fixedly connected to the upper joint 300. The lower end of the upper nipple 210 is fixedly connected to the lower nipple 220. The lower end of the lower nipple 220 is fixedly connected. It is rotatably connected to the base 110 of the drill bit base 100 .

Specifically, the outer wall of the base 110 is provided with a plurality of upwardly protruding third protrusions 111, and the plurality of third protrusions 111 are evenly distributed along the circumferential direction of the base 110; the lower end of the lower nipple 220 is provided with a plurality of For the fourth protrusion that matches the third protrusion 111, a plurality of fourth protrusions are evenly distributed along the circumferential direction of the lower nipple 220, and the third protrusion 111 and the fourth protrusion are fixed by spline connection. Thereby, the drill bit base 100 is driven to rotate.

A ball groove 140 is also provided between the first boss portion 120 and the lower sub-joint 220. A plurality of balls are provided in the ball groove 140 to suspend the drill bit base 100.

Further, the driving device of this embodiment is arranged in the upper sub-joint 210. The driving device includes a turbine rotor 510 and a turbine stator 520 that are arranged oppositely. The turbine stator 520 abuts against the inner wall of the upper sub-joint 210. The turbine rotor 510 and The rotating distribution shaft 400 is fixedly connected, and a liquid channel is formed between the turbine stator 520 and the turbine rotor 510 .

The upper end of the rotating flow distribution shaft is connected to a split end cover 600. The diameter of the center hole of the split end cover 600 is smaller than the diameter of the central hole of the rotating flow distribution shaft 400. The rotating flow distribution shaft 400 is also provided with a return hole 430, which is used to connect the liquid channel. And the rotating distribution shaft 400, the return hole 430 is located below the driving device.

The upper end of the driving device is provided with a centering bearing 700 to prevent the tilting of the rotating distribution shaft 400; the upper end of the centering bearing 700 is provided with a compression nut 710, which is used to compress the turbine rotor 510; the lower end of the upper nipple 210 is also A first step surface is provided, and a thrust bearing 720 is provided on the first step surface.

When the pulsating compound impactor of this embodiment is in use, the drilling fluid enters the interior of the outer shell 200 from the drilling fluid flow channel 310, and a part of the drilling fluid flows into the rotating distribution shaft through the diverter end cover 600. Due to the diameter of the central hole of the diverter end cap 600 is smaller than the central hole diameter of the rotating distribution shaft 400. Therefore, the drilling fluid that has not flowed into the rotating distribution shaft 400 flows into the liquid channel between the turbine stator 520 and the turbine rotor 510 through the gap of the centering bearing 700, and drives the turbine rotor 510 to rotate. As a result, the entire rotating distribution shaft 400 is driven to rotate, so that the first distribution opening 410 and the first through hole 131 and the second distribution opening 420 and the second through hole 132 are periodically connected.

The drilling fluid that drives the turbine rotor 510 to rotate flows back into the rotating distribution shaft 400 through the return hole 430. The entire return hole 430 is inclined downward to facilitate drainage.

Furthermore, in this embodiment, the upper end of the second boss portion 130 abuts against the inner wall of the upper nipple 210 , and the outer wall of the lower end of the upper nipple 210 is threadedly connected to the inner wall of the upper end of the lower nipple 220 . The second boss A second step surface is formed on the outer surface of the portion 130, and a sealing end cap 800 is provided on the second step surface. The sealing end cap 800 is used to seal the axial gap and the circumferential gap.

Specifically, the sealed end cap 800 includes an end cap body 810 and a fifth protrusion 820 disposed on the end cap body. The end cap body 810 is disposed on the second boss portion 130 , and the lower end surface of the fifth protrusion 820 abuts against the end cap body 810 . On the upper end surface of the first protrusion 121, the fifth protrusion 820 and the first protrusion 121 jointly define a circumferential space, and the arc length of the adjacent fifth protrusion 820 is equal to the arc length of the second protrusion 221. wait. The second protrusion 221 is located in the circumferential space, and the upper end of the second protrusion 221 is stuck between the adjacent fifth protrusions 820; under the impact of the drilling fluid, the first protrusion 121 rotates, thereby interacting with the third protrusion 820. A circumferential gap is formed between the two protrusions 221 .

A fixed ring 830 is also provided above the end cap body 810. The fixed ring 830 is threadedly connected to the second boss portion 130 to limit the axial movement of the sealed end cap 800. The fixed ring 830 and the lower end of the upper nipple 210 jointly define a Axial clearance.

Furthermore, the drill bit seat 100 of this embodiment is also provided with a throttle seat. The throttle seat includes a throttle seat body 910 and a throttle seat protrusion 920 provided on the throttle seat body 910. The throttle seat protrusion The diameter of the portion 920 is smaller than the inner diameter of the rotating valve shaft 400, so that the throttle seat protruding portion 920 extends into the rotating valve shaft 400. The throttle seat body 910 is provided with a plurality of vertical drain holes. The plurality of drain holes Set evenly around the circumference.

The use process of the pulsating compound impactor of this embodiment will be further described below with reference to the accompanying drawings. Figure 6A is a cross-sectional view along the A-A direction in Figure 1 in the first state; Figure 6B is a cross-sectional view along the B-B direction in Figure 1 in the first state; Figure 7A is a cross-sectional view along the A-A direction in Figure 1 in the second state; Figure 7B is a second Please refer to Figure 6A-Figure 7B for the cross-sectional view along B-B in Figure 1.

The pulsating compound impactor in this embodiment is driven by the external drilling tool and rotates at all times. As shown in Figures 6A and 6B, when drilling starts, the drilling fluid flows into the outer housing 200 through the drilling fluid flow channel 310 on the upper joint 300, and a part of the drilling fluid flows directly into the rotary shaft 400 through the center hole of the diverter cap 600 at the upper end of the rotary distribution shaft 400. In the distribution shaft 400, a part of the drilling fluid flows into the liquid channel between the wheel stator 520 and the turbine rotor 510, driving the turbine rotor 510 to rotate, thereby driving the rotating distribution shaft to rotate in a certain direction. A part of the drilling fluid in the rotating distribution shaft 400 flows into the axial gap through the first distribution port 410 and the first through hole 131. The drilling fluid flowing into the axial gap impacts the sealing end cover 800 and pushes the drill bit seat 100 axially. down movement. Another part of the drilling fluid in the rotating distribution shaft 400 flows into the circumferential gap through the second distribution port 420 and the second through hole 132. The drilling fluid flowing into the circumferential gap impacts the end surface of the first protrusion 121 of the drill bit base 100, and The first protrusion 121 and the sealing end cover 800 are pushed to rotate, so as to push the drill bit base 100 to rotate in the circumferential direction. At this time, the third protrusion 111 and the fourth protrusion are in the first state shown in FIG. 6B.

As shown in FIGS. 7A and 7B , as the rotating flow distribution shaft 400 continues to rotate, the first flow distribution opening 410 and the first through hole 131 , and the second flow distribution opening 420 and the second through hole 132 will be staggered. Under the action of the self-weight of the superstructure, the outer shell 200 moves downward, pushing the drilling fluid in the axial gap to flow out through the first through hole 131. At the same time, the fourth protrusion on the outer shell 200 impacts the third protrusion 111 on the drill bit seat 100. , producing axial impact. Under the rotation of the pulsating compound impactor itself, the outer casing 200 will push the drilling fluid in the circumferential gap to flow out through the second through hole 132, and the fourth raised side on the outer casing 200 impacts the third protruding hole on the drill bit base 100. A torsional impact occurs on the side of the protrusion 111. At this time, the third protrusion 111 and the fourth protrusion are in the second state shown in FIG. 7B.

With the continuous rotation of the rotating flow distribution shaft 400, the first flow distribution opening 410 and the first through hole 131, and the second flow distribution opening 420 and the second through hole 132 can be connected periodically, so that the drilling fluid flows into the circumferential gap and the shaft. into the gap to exert circumferential impact force and axial impact force on the drill bit seat 100 . It can be found from the above description that the impact frequency of the pulsating compound impactor in this embodiment can be controlled by adjusting the rotation speed of the turbine rotor 510. Furthermore, it is only necessary to control the flow rate and flow rate of the inflowing drilling fluid. The control method is simple and can break the Rock efficiency is high.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features can be equivalently replaced; and these modifications or substitutions do not deviate from the essence of the corresponding technical solutions from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. A pulsating compound impactor, characterized in that it includes a drill bit base, an outer shell and an upper joint. The upper end of the outer shell is fixedly connected to the upper joint, and the lower end of the outer shell rotates with the drill bit base. connected; connected The upper joint is provided with a drilling fluid flow channel, and the drilling fluid can enter the outer shell body through the drilling fluid flow channel; a rotating flow distribution shaft is provided in the outer shell body, between the rotating flow distribution shaft and the outer shell body A driving device is provided, and the driving device can drive the rotating distribution shaft to rotate when driven by drilling fluid; The drill bit seat includes a base and a boss portion. The base is rotationally connected to the outer shell. The boss portion extends into the outer shell. The boss portion includes a first boss portion and a second boss portion. Boss portion, the first boss portion is sleeved on the outside of the second boss portion, the second boss portion is provided with an axial through hole, and the lower end of the rotating distribution shaft is located on the shaft. Into the through hole, the upper end of the first boss portion is provided with a plurality of first protrusions, the outer shell is provided with a plurality of second protrusions, and the arcs between adjacent first protrusions are is longer than the arc length of the second protrusion, thereby forming a circumferential gap between the first protrusion and the second protrusion; the surface of the rotating distribution shaft is provided with a first distribution port and a second distribution port, so The first flow distribution opening is located above the second flow distribution opening, and the second boss portion is provided with a first through hole and a second through hole that match the first flow distribution opening and the second flow distribution opening. , an axial gap is provided between the first via hole and the outer shell. 2. The pulsating compound impactor according to claim 1, wherein the outer shell includes an upper nipple and a lower nipple, the upper end of the upper nipple is fixedly connected to the upper joint, and the upper nipple is fixedly connected to the upper joint. The lower end of the sub-section is fixedly connected to the lower sub-section, and the lower end of the lower sub-section is rotationally connected to the base of the drill bit seat. 3. The pulsating compound impactor according to claim 2, wherein a plurality of third protrusions protruding upward are provided on the outer side wall of the base, and the plurality of third protrusions are arranged along the The base is evenly distributed in the circumferential direction; the lower end of the lower short section is provided with a plurality of fourth protrusions for matching with the third protrusions, and the plurality of fourth protrusions are arranged along the lower end of the lower short section. Evenly distributed in the circumferential direction, and the third protrusion and the fourth protrusion are fixed by spline connection; A ball groove is also provided between the first boss portion and the lower sub-joint, and a plurality of balls are provided in the ball groove. 4. The pulsating compound impactor according to claim 3, characterized in that the driving device is arranged in the upper sub-section, the driving device includes a turbine rotor and a turbine stator arranged oppositely, and the turbine stator Pressed against the inner wall of the upper nipple, the turbine rotor is fixedly connected to the rotating distribution shaft, and a liquid channel is formed between the turbine stator and the turbine rotor. 5. The pulsating compound impactor according to claim 4, wherein the upper end of the rotating distribution shaft is connected to a shunt end cover, and the diameter of the center hole of the shunt end cover is smaller than the center hole of the rotating distribution shaft. diameter; the rotating distribution shaft is also provided with a return hole, the return hole is used to connect the liquid channel and the rotating distribution shaft, and the return hole is located below the driving device. 6. The pulsating compound impactor according to claim 5, wherein the upper end of the driving device is provided with a centering bearing, and the upper end of the centering bearing is provided with a compression nut; the lower end of the upper sub-joint is also provided with a compression nut. A first step surface is provided, and a thrust bearing is provided on the first step surface. 7. The pulsating compound impactor according to claim 6, wherein the upper end of the second boss portion abuts against the inner wall of the upper nipple, and the outer surface of the second boss portion A second step surface is formed on the upper surface, and a sealing end cover is provided on the second step surface. 8. The pulsating compound impactor according to claim 7, wherein the sealed end cover includes an end cover body and a fifth protrusion provided on the end cover body, and the end cover body is provided on On the second boss portion, the lower end surface of the fifth protrusion abuts the upper end surface of the first protrusion, and the fifth protrusion and the first protrusion jointly define a circumferential direction. space, and the arc length of the adjacent fifth protrusion is equal to the arc length of the second protrusion; the second protrusion is located in the circumferential space, and the upper end of the second protrusion It is clamped between the adjacent fifth protrusions. 9. The pulsating compound impactor according to claim 8, wherein a fixed ring is further provided above the end cover body, and the fixed ring is threadedly connected to the second boss portion to limit the The fixed ring and the lower end of the upper nipple jointly define the axial gap due to the axial movement of the sealing end cap. 10. The pulsating compound impactor according to claim 9, characterized in that a throttle seat is further provided in the drill bit seat, and the throttle seat includes a throttle seat body and a The diameter of the throttle seat protrusion is smaller than the inner diameter of the rotary valve shaft, so that the throttle seat protrusion extends into the rotary valve shaft. The flow seat body is provided with a plurality of vertical leak holes, and the plurality of leak holes are evenly arranged along the circumferential direction.