Mechanical impact annular notch stress-relief drilling speed increasing device and drilling method

Abstract

The application discloses a mechanical impact annular cutting groove stress unloading drilling speed increasing device and a drilling method, and belongs to the technical field of oil drilling engineering. The device comprises an impact tool and a drill bit. The impact tool comprises an outer cylinder, and a turbine shaft steel sleeve, a turbine shaft, a valve disc, a valve seat and an impactor are coaxially arranged in the outer cylinder from top to bottom. A turbine is coaxially fixed on the turbine shaft. The drill bit comprises a drill bit joint, a cutting groove unloading cylinder parent body and an impact drill bit parent body. A plurality of annular cutting groove stress unloading teeth are arranged at the lower end of the cutting groove unloading cylinder parent body, and impact breaking teeth are arranged at the lower end of the impact drill bit parent body. When the drill bit reaches the bottom of the well, the annular cutting groove stress unloading teeth contact the bottom of the well before the impact breaking teeth. The application realizes the continuous operation of the annular cutting groove at the bottom of the well. The structure of the impact tool above the drill bit is arranged, the impactor is impacted by using the drilling fluid pressure, additional impact force is provided for the drill bit, and the damage of the drill bit to the rock is further increased.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oil drilling engineering, and particularly relates to a mechanical impact annular slot stress unloading drilling speed increasing device and a drilling method. BACKGROUND

[0002] The deep well bottom rock is compressed by the static liquid column pressure and the ground stress, so that the rock strength is increased, the plasticity is large, and the mechanical drilling speed of the drill bit is reduced; at present, the mechanical drilling speed is mainly improved by improving the attack energy of the downhole tool, but the rock damage of the drilling tool is caused under the high confining pressure. At present, a method for cutting and grooving the well bottom rock by using the superhigh pressure water jet to unload the well bottom rock stress is provided, so that the rock strength is reduced and the rock drillability is improved, but due to the heterogeneity of the rock and the pulse characteristics of the superhigh pressure water jet, the well bottom rock cutting and grooving is discontinuous, which limits the efficient use of the method.

[0003] Based on this, from the continuity of the well bottom rock cutting and grooving, the application provides a mechanical impact annular slot stress unloading drilling speed increasing device and a drilling method, the continuous operation of the well bottom annular cutting and grooving is realized by the setting of the drill bit structure, the defect of the discontinuous well bottom cutting and grooving caused by the pulse characteristics of the superhigh pressure water jet is solved, and the additional impact force is provided for the drill bit by the setting of the impact tool above the drill bit, and the damage of the drill bit to the rock is further increased. SUMMARY

[0004] The application aims to overcome the defects of the prior art, and provides a mechanical impact annular slot stress unloading drilling speed increasing device.

[0005] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0006] A mechanical impact annular slot stress unloading drilling speed increasing device, comprising an impact tool and a drill bit.

[0007] The impact tool comprises an outer cylinder, a turbine shaft steel sleeve, a turbine shaft, a valve disc, a valve seat and an impactor are sequentially coaxially arranged in the outer cylinder from top to bottom; the radial outer side surface of the turbine shaft steel sleeve is fixedly connected with the inner side surface of the outer cylinder, the upper end of the turbine shaft is rotationally matched with the turbine shaft steel sleeve, the lower end of the turbine shaft is fixedly connected with the valve disc, the radial outer side surface of the valve disc is rotationally matched with the inner side surface of the outer cylinder, the radial outer side surface of the valve seat is fixedly connected with the inner side surface of the outer cylinder, and the radial inner side surface of the valve seat is rotationally matched with the valve disc, and the impactor is axially slidably matched with the inner side surface of the outer cylinder.

[0008] An upper annular space is formed between the turbine shaft and the outer cylinder, flow channel holes penetrating in the axial direction are arranged on the turbine shaft steel sleeve, the valve disc and the valve seat, and a turbine is coaxially fixedly arranged on the turbine shaft.

[0009] The outer cylinder inner cavity between the valve seat and the impactor forms a fluid buffer zone, and the middle part of the impactor is provided with a through impact drilling fluid flow channel;

[0010] The drill bit comprises a drill bit joint, a notch unloading cylinder body, and an impact drill bit body, the drill bit joint is coaxially fixed to the lower end of the impactor, the upper end of the impact drill bit body is coaxially fixedly connected to the radially inner side of the lower end of the drill bit joint, and the notch unloading cylinder body is located outside the impact drill bit body and connected to the lower end of the drill bit joint.

[0011] The lower end of the notch unloading cylinder body is uniformly provided with a plurality of annular notch unloading stress teeth in the circumferential direction, and the lower end of the impact drill bit body is provided with impact breaking teeth; when the drill bit reaches the bottom of the well, the annular notch unloading stress teeth contact the bottom of the well before the impact breaking teeth.

[0012] Preferably, a first drilling fluid flow channel is arranged in the drill bit joint, and a second drilling fluid flow channel is arranged in the impact drill bit body and communicates with the first drilling fluid flow channel.

[0013] The impact drill bit body is provided with a nozzle flow channel extending to the bottom end, the upper end of the nozzle flow channel communicates with the second drilling fluid flow channel, and the lower end of the nozzle flow channel is provided with a nozzle.

[0014] Preferably, an annular groove is formed on the radially outer side of the impactor, an upper spring is arranged in the annular groove, the upper end of the upper spring is fixed to the upper end face of the annular groove, and the lower end of the upper spring is fixed to the inner side step end face of the outer cylinder.

[0015] Preferably, the upper end of the notch unloading cylinder body is axially and slidingly connected to the radially outer side of the lower end of the drill bit joint.

[0016] An annular space is formed between the radially inner side of the notch unloading cylinder body and the radially outer side of the impact drill bit body.

[0017] An annular step is coaxially and fixedly arranged on the radially inner side of the notch unloading cylinder body, and the radially inner side of the annular step is axially and slidingly connected to the radially outer side of the impact drill bit body.

[0018] A lower spring is arranged in the annular space between the bottom end face of the drill bit joint and the top end face of the annular step.

[0019] Preferably, the lower end of the notch unloading cylinder body is uniformly provided with a plurality of tooth supports in the circumferential direction, and each tooth support is provided with an annular notch unloading stress tooth.

[0020] Preferably, all the annular notch unloading stress teeth are arranged on the same side of the corresponding tooth support in the circumferential direction.

[0021] Preferably, the annular slotted stress-relieved tooth center axis is inclined downward away from the end of the tooth support.

[0022] Preferably, a centralizer is arranged in the upper annular space of the turbine, and the centralizer is provided with a centralizer flow-through hole penetrating in the axial direction.

[0023] The application further discloses a mechanical impact annular slotted stress-relieved drilling method.

[0024] A mechanical impact annular slotted stress-relieved drilling method is implemented based on a mechanical impact annular slotted stress-relieved drilling speed-increasing device, and the drilling method comprises the following steps.

[0025] Step 1: When the drill bit reaches the bottom of the well, the annular slotted stress-relieved tooth contacts the bottom of the well before the impact breaking tooth, and the spring is compressed under the action of the drilling pressure to transmit the drilling pressure to the annular slotted stress-relieved tooth.

[0026] Under the combined action of the drilling pressure and the torque, the annular slotted stress-relieved tooth cuts an annular groove on the bottom end face of the well to unload the bottom pressure.

[0027] Step 2: The drill bit continuously drills, the depth of the annular groove is continuously deepened, and the impact breaking tooth begins to contact the bottom rock inside the annular groove and breaks the rock.

[0028] Step 3: Under the action of the drilling pressure and the torque, the annular slotted stress-relieved tooth continuously cuts the annular groove, and the impact breaking tooth continuously breaks the rock inside the annular groove, so that the rock is broken in combination.

[0029] In the process:

[0030] The drilling fluid enters the upper annular space through the flow channel hole on the turbine shaft steel sleeve, flows through the turbine, and the turbine drives the turbine shaft and the valve disc to rotate. When the flow channel hole on the valve disc is rotated to be not connected with the flow channel hole on the valve seat, the drilling fluid in the upper annular space is pressurized. When the flow channel hole on the valve disc is rotated to be connected with the flow channel hole on the valve seat, the pressurized drilling fluid flows from the upper annular space to the fluid buffer zone to impact the impactor, so that the impact force is formed.

[0031] The impact force acts on the drill bit in combination with the drilling pressure and the torque to accelerate the rock breaking.

[0032] The drilling fluid entering the fluid buffer zone is sprayed outward through the impact drilling fluid flow channel, the first drilling fluid flow channel, the second drilling fluid flow channel, the nozzle flow channel and the nozzle, and then carries the broken rock cuttings to the annulus through the gap of the tooth support after cleaning the impact breaking tooth and the annular slotted stress-relieved tooth.

[0033] The application has the following beneficial effects:

[0034] (1) The present application realizes continuous operation of the annular cutting groove at the bottom of the well by the structure of the drill bit itself, and the structure of the impact tool above the drill bit uses the pressure of the drilling fluid to realize the impact of the impactor, that is, the additional impact force is provided for the drill bit without using additional power mechanism, further increasing the damage of the drill bit to the rock.

[0035] (2) In the present application, the upper spring converts the impact of the drilling fluid on the impactor into soft impact, which protects the impact breaking teeth; the lower spring converts the impact of the upper impact tool of the drill bit into soft impact, which protects the annular cutting groove unloading stress teeth.

[0036] (3) In the present application, the lower end of the cutting groove unloading cylinder matrix is uniformly provided with a plurality of annular cutting groove unloading stress teeth in the circumferential direction, and this arrangement can still cut the annular cutting groove through other annular cutting groove unloading stress teeth when part of the annular cutting groove unloading stress teeth are damaged, without affecting the use. BRIEF DESCRIPTION OF DRAWINGS

[0037] The drawings accompanying the specification of this application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application.

[0038] Figure 1 is a structural schematic view of the mechanical impact annular cutting groove stress unloading drilling speed increasing device of the present application;

[0039] Figure 2 is a partial enlarged view of A in Figure 1

[0040] Figure 3 is a matching schematic view of the drill bit joint and the cutting groove unloading cylinder matrix in the present application;

[0041] Among them:

[0042] 11-turbine shaft steel sleeve, 12-turbine shaft, 13-valve disc, 14-valve seat, 15-impactor, 151-impact drilling fluid flow channel, 152-upper spring, 16-upper annular space, 17-turbine, 18-fluid buffer zone, 19-centralizer, 110-drill string outer cylinder, 111-spring outer cylinder, 112-upper joint;

[0043] 21-drill bit joint, 22-lower spring, 23-cutting groove unloading cylinder matrix, 231-annular step, 24-first drilling fluid flow channel, 25-second drilling fluid flow channel, 26-nozzle, 27-annular cutting groove unloading stress tooth, 28-impact breaking tooth, 29-tooth support, 210-impact drill bit matrix, 2101-nozzle flow channel. DETAILED DESCRIPTION

[0044] ​It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] In this invention, terms such as "upper," "lower," "bottom," and "top" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are merely relational terms determined for the convenience of describing the structural relationship of the various components or elements of this invention, and do not specifically refer to any component or element in this invention, and should not be construed as limiting this invention.

[0047] In this invention, terms such as "connected" and "linked" should be interpreted broadly, indicating a fixed connection, an integral connection, or a detachable connection; a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can determine the specific meaning of these terms in this invention based on the specific circumstances, and they should not be construed as limitations on the invention.

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] Example 1:

[0050] like Figure 1 As shown, a mechanical impact annular groove stress unloading drilling speed-up device includes an impact tool and a drill bit.

[0051] The impact tool comprises an outer cylinder, inside which are coaxially arranged from top to bottom a turbine shaft steel sleeve 11, a turbine shaft 12, a valve disc 13, a valve seat 14 and an impactor 15; the radial outer side of the turbine shaft steel sleeve 11 is fixedly connected with the inner side of the outer cylinder, the upper end of the turbine shaft 12 is rotationally matched with the turbine shaft steel sleeve 11, the lower end of the turbine shaft 12 is fixedly connected with the valve disc 13, the radial outer side of the valve disc 13 is rotationally matched with the inner side of the outer cylinder, the radial outer side of the valve seat 14 is fixedly connected with the inner side of the outer cylinder and the radial inner side is rotationally matched with the valve disc 13, and the impactor 15 is axially slidably matched with the inner side of the outer cylinder; specifically, in the present application, the outer cylinder comprises a coaxially fixed drill string outer cylinder 110 and a spring outer cylinder 111, wherein the turbine shaft steel sleeve 11, the turbine shaft 12, the valve disc 13 and the valve seat 14 are located in the drill string outer cylinder 110, the impactor 15 is located in the spring outer cylinder 111, the lower end of the impactor 15 extends out of the spring outer cylinder 111 and is connected with a drill bit joint 21, and the upper end of the drill string outer cylinder 110 is coaxially connected with an upper joint 112;

[0052] An upper annular space 16 is formed between the turbine shaft 12 and the outer cylinder, flow channel holes penetrating in the axial direction are arranged on the turbine shaft steel sleeve 11, the valve disc 13 and the valve seat 14, and a turbine 17 is coaxially fixedly arranged on the turbine shaft 12;

[0053] A fluid buffer zone 18 is formed in the inner cavity of the outer cylinder between the valve seat 14 and the impactor 15, and a through impact drilling fluid channel 151 is arranged in the middle of the impactor 15;

[0054] The drill bit comprises the drill bit joint 21, a slotted unloading cylinder body 23 and an impact drill bit body 210, the drill bit joint 21 is coaxially fixedly connected with the lower end of the impactor 15, the upper end of the impact drill bit body 210 is coaxially fixedly connected with the radial inner side of the lower end of the drill bit joint 21, and the slotted unloading cylinder body 23 is located outside the impact drill bit body 210 and connected with the lower end of the drill bit joint 21; wherein the upper end of the impact drill bit body 210 is threadedly connected with the radial inner side of the lower end of the drill bit joint 21 for transmitting the drilling pressure and the torque;

[0055] A plurality of annular slotted unloading stress teeth 27 are uniformly arranged on the lower end of the slotted unloading cylinder body 23 in the circumferential direction for realizing annular slotted cutting of the rock, and impact breaking teeth 28 are arranged on the lower end of the impact drill bit body 210 for realizing breaking of the rock inside the annular slotted cutting; when the drill bit reaches the bottom of the well, the annular slotted unloading stress teeth 27 contact the bottom of the well earlier than the impact breaking teeth 28. In the present application, the annular slotted unloading stress teeth 27 are PDC teeth.

[0056] Preferably, the drill bit joint 21 is provided with a first through-going drilling fluid channel 24, and the impact drill bit body 210 is provided with a second drilling fluid channel 25 in communication with the first drilling fluid channel 24.

[0057] The impact drill bit body 210 is provided with a nozzle channel 2101 extending to the bottom end, the upper end of the nozzle channel 2101 being in communication with the second drilling fluid channel 25, and the lower end of the nozzle channel 2101 being provided with a nozzle 26.

[0058] Preferably, the radial outer side of the impactor 15 is provided with an annular groove, and the annular groove is provided with an upper spring 152, the upper end of the upper spring 152 being fixed on the upper end face of the annular groove, and the lower end of the upper spring 152 being fixed on the inner step end face of the outer cylinder.

[0059] The upper spring 152 converts the impact of the drilling fluid on the impactor 15 into soft impact, i.e. buffering, thereby protecting the impact breaking teeth 28.

[0060] Preferably, the upper end of the slotted unloading cylinder body 23 is axially slidingly fitted with the radial outer side of the lower end of the drill bit joint 21; specifically, as shown in Figure 3 the radial inner side of the upper end of the slotted unloading cylinder body 23 is provided with a spline groove matched with the spline on the radial outer side of the lower end of the drill bit joint 21, for transmitting the torque of the drill string and realizing the axial sliding fit;

[0061] The radial inner side of the slotted unloading cylinder body 23 and the radial outer side of the impact drill bit body 210 form an annular space;

[0062] The radial inner side of the slotted unloading cylinder body 23 is coaxially fixed with an annular step 231, and the radial inner side of the annular step 231 is axially slidingly fitted with the radial outer side of the impact drill bit body 210;

[0063] The annular space between the bottom end face of the drill bit joint 21 and the top end face of the annular step 231 is provided with a lower spring 22, wherein the upper end of the lower spring 22 is fixedly connected with the bottom end face of the drill bit joint 21, and the lower end of the lower spring 22 is fixedly connected with the top end face of the annular step 231; the lower spring 22 converts the impact of the upper part of the drill bit into soft impact, i.e. buffering, thereby protecting the annular slotted unloading stress teeth 27.

[0064] Preferably, the lower end of the slotted unloading cylinder body 23 is uniformly provided with a plurality of tooth supports 29 in the circumferential direction, and each tooth support 29 is provided with an annular slotted unloading stress tooth 27.

[0065] Preferably, all the annular slotted stress relief teeth 27 are arranged on the same side of the corresponding tooth holder 29 in the circumferential direction, for example, in the front side of the tooth holder 29 in the clockwise circumferential direction as viewed from the top view of Figure 2 Preferably, all the annular slotted stress relief teeth 27 are arranged on the same side of the corresponding tooth holder 29 in the circumferential direction, for example, in the front side of the tooth holder 29 in the clockwise circumferential direction as viewed from the top view of

[0066] Preferably, the central axis of the annular slotted stress relief tooth 27 is inclined downward away from one end of the tooth holder 29, so that it has a more optimal cutting effect on the rock.

[0067] Preferably, a centralizer 19 is arranged in the upper annular space 16 of the upper part of the turbine 17, and the centralizer 19 is provided with a centralizer flow-through hole penetrating in the axial direction.

[0068] Embodiment 2:

[0069] A mechanical impact annular slotted stress relief drilling method is implemented based on the mechanical impact annular slotted stress relief drilling speed increasing device in embodiment 1, and the drilling method comprises the following steps:

[0070] Step 1: When the drill bit reaches the bottom of the well, the annular slotted stress relief teeth 27 contact the bottom of the well before the impact breaking teeth 28, and under the action of the drilling pressure, the spring 22 is compressed to transmit the drilling pressure to the annular slotted stress relief teeth 27;

[0071] Under the combined action of the drilling pressure and the torque, the annular slotted stress relief teeth 27 cut a ring-shaped groove on the bottom surface of the well, and unload the bottom pressure;

[0072] Step 2: The drill bit continues to drill, the depth of the annular slotted stress relief teeth 27 continues to deepen, and the impact breaking teeth 28 begin to contact the bottom rock inside the annular slotted stress relief teeth 27 and break;

[0073] Step 3: Under the action of the drilling pressure and the torque, the annular slotted stress relief teeth 27 continue to cut the annular slotted stress relief teeth 27, and the impact breaking teeth 28 continue to break the rock inside the annular slotted stress relief teeth 27, realizing joint rock breaking;

[0074] In this process:

[0075] The drilling fluid enters the upper annular space 16 through the flow channel hole on the turbine shaft steel sleeve 11, flows through the turbine 17, and the turbine 17 drives the turbine shaft 12 and the valve disc 13 to rotate. When the flow channel hole on the valve disc 13 is rotated to be not connected with the flow channel hole on the valve seat 14, the drilling fluid in the upper annular space 16 is pressurized; when the flow channel hole on the valve disc 13 is rotated to be connected with the flow channel hole on the valve seat 14, the pressurized drilling fluid flows from the upper annular space 16 to the fluid buffer zone 18 to impact the impactor 15, forming an impact force;

[0076] The impact force acts on the drill bit, and the combined action of the drilling pressure and the torque accelerates the destruction of the rock;

[0077] The drilling fluid entering the fluid buffer zone 18 is sprayed outward through the impact drilling fluid channel 151, the first drilling fluid channel 24, the second drilling fluid channel 25, the nozzle channel 2101 and the nozzle 26, and then is transported to the annular space through the gaps between the tooth supports 29 after cleaning the impact teeth 28 and the annular groove stress relief teeth 27.

[0078] The present application realizes the continuous operation of the annular groove at the bottom of the well by the structure of the drill bit itself, and realizes the impact of the impactor by the pressure of the drilling fluid through the structure of the impact tool above the drill bit, that is, the additional impact force is provided for the drill bit without using an additional power mechanism, and the damage of the drill bit to the rock is further increased.

[0079] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation of the present application. It should be understood by those skilled in the art that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A mechanical impact annular cutting groove stress relief drilling speed increasing device, comprising an impact tool and a drill bit; characterized in that, the impact tool comprises an outer cylinder, a turbine shaft steel sleeve, a turbine shaft, a valve disc, a valve seat and an impactor are coaxially arranged in the outer cylinder from top to bottom; the radial outer side surface of the turbine shaft steel sleeve is fixedly connected with the inner side surface of the outer cylinder, the upper end of the turbine shaft is rotationally connected with the turbine shaft steel sleeve, the lower end of the turbine shaft is fixedly connected with the valve disc, the radial outer side surface of the valve disc is rotationally connected with the inner side surface of the outer cylinder, the radial outer side surface of the valve seat is fixedly connected with the inner side surface of the outer cylinder, and the radial inner side surface of the valve seat is rotationally connected with the valve disc, the radial outer side surface of the impactor is axially slidably connected with the inner side surface of the outer cylinder; an upper annular space is formed between the turbine shaft and the outer cylinder, flow channel holes penetrating in the axial direction are arranged on the turbine shaft steel sleeve, the valve disc and the valve seat, and a turbine is coaxially fixedly arranged on the turbine shaft; a fluid buffer zone is formed in the inner cavity of the outer cylinder between the valve seat and the impactor, a through impact drilling fluid flow channel is arranged in the middle of the impactor; the drill bit comprises a drill bit joint, a cutting groove stress relief cylinder body and an impact drill bit body, the drill bit joint is coaxially fixedly connected with the lower end of the impactor, the upper end of the impact drill bit body is coaxially fixedly connected with the radial inner side of the lower end of the drill bit joint, and the cutting groove stress relief cylinder body is located outside the impact drill bit body and connected with the lower end of the drill bit joint; a plurality of annular cutting groove stress relief teeth are uniformly arranged on the lower end of the cutting groove stress relief cylinder body in the circumferential direction, and impact breaking teeth are arranged on the lower end of the impact drill bit body; when the drill bit reaches the bottom of the well, the annular cutting groove stress relief teeth contact the bottom of the well before the impact breaking teeth; the upper end of the cutting groove stress relief cylinder body is axially slidably connected with the radial outer side of the lower end of the drill bit joint; an annular space is formed between the radial inner side surface of the cutting groove stress relief cylinder body and the radial outer side surface of the impact drill bit body; an annular step is coaxially fixedly arranged on the radial inner side surface of the cutting groove stress relief cylinder body, and the radial inner side of the annular step is axially slidably connected with the radial outer side surface of the impact drill bit body; a lower spring is arranged in the annular space between the bottom end surface of the drill bit joint and the top end surface of the annular step; a plurality of tooth supports are uniformly arranged on the lower end of the cutting groove stress relief cylinder body in the circumferential direction, and one annular cutting groove stress relief tooth is arranged on each tooth support.

2. The mechanical impact annular gash stress-relief drilling speed-enhancing device of claim 1, wherein, a through first drilling fluid flow channel is arranged in the drill bit joint, and a second drilling fluid flow channel is arranged in the impact drill bit body and connected with the first drilling fluid flow channel; a nozzle flow channel extending to the bottom end is arranged in the impact drill bit body, the upper end of the nozzle flow channel is connected with the second drilling fluid flow channel, and a nozzle is arranged at the lower end of the nozzle flow channel.

3. The mechanical impact annular gash stress-relief drilling speed-enhancing device of claim 2, wherein, an annular groove is arranged on the radial outer side surface of the impactor, an upper spring is arranged in the annular groove, the upper end of the upper spring is fixedly connected with the upper end surface of the annular groove, and the lower end of the upper spring is fixedly connected with the inner step end surface of the outer cylinder.

4. The mechanical impact annular gash stress-relief drilling speed enhancer of claim 2, wherein, All annular cutting groove stress relief teeth are arranged on the same side of the corresponding tooth support in the circumferential direction.

5. The mechanical impact annular gash stress-relief drilling speed enhancer of claim 2, wherein, The central axis of the annular cutting groove stress relief tooth deviates from the end of the tooth support and is inclined downward.

6. The mechanical impact annular gash stress-relief drilling speed enhancer of claim 2, wherein, The upper annular space of the turbine upper part is provided with a centralizer, and the centralizer is provided with a centralizer flow-through hole penetrating in the axial direction.

7. A mechanical impact annular grooving stress-relief drilling method, based on the mechanical impact annular grooving stress-relief drilling speed-up device according to any one of claims 2 to 6, characterized in that, The drilling method comprises the following steps: Step 1: When the drill bit reaches the bottom of the well, the annular groove stress relief tooth contacts the bottom of the well before the impact breaking tooth, and the spring is compressed under the action of the drilling pressure to transmit the drilling pressure to the annular groove stress relief tooth; Under the combined action of the drilling pressure and the torque, the annular groove stress relief tooth cuts an annular groove on the bottom end face of the well, and unloads the bottom pressure; Step 2: The drill bit continues to drill, the depth of the annular groove is continuously deepened, and the impact breaking tooth begins to contact the bottom rock inside the annular groove and break it; Step 3: Under the action of the drilling pressure and the torque, the annular groove stress relief tooth continues to cut the annular groove, and the impact breaking tooth continues to break the rock inside the annular groove, realizing joint rock breaking; In this process: The drilling fluid enters the upper annular space through the flow channel hole on the turbine shaft steel sleeve, flows through the turbine, and the turbine drives the turbine shaft and the valve disc to rotate; when the flow channel hole on the valve disc is rotated to be not connected with the flow channel hole on the valve seat, the drilling fluid in the upper annular space is pressurized; when the flow channel hole on the valve disc is rotated to be connected with the flow channel hole on the valve seat, the pressurized drilling fluid flows from the upper annular space to the fluid buffer zone to impact the impactor, forming an impact force; The impact force acts on the drill bit, and the combined action of the drilling pressure and the torque accelerates the destruction of the rock; And the drilling fluid entering the fluid buffer zone is sprayed outward through the impact drilling fluid flow channel, the first drilling fluid flow channel, the second drilling fluid flow channel, the nozzle flow channel and the nozzle, and after cleaning the impact breaking tooth and the annular groove stress relief tooth, it carries the broken rock cuttings to the annulus through the gap of the tooth support.

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