A deep well drilling anti-sticking buffer device

Abstract

The present application relates to the technical fields of deep well drilling, and especially relates to a deep well drilling anti-sticking buffer device, which comprises a first connecting piece, a threaded groove is arranged on the upper part of the first connecting piece, a first through hole is arranged in the first connecting piece, a limiting block is installed on the lower part of the first connecting piece, a second connecting piece is slidably connected to the lower part of the first connecting piece, a threaded groove is arranged on the middle part of the second connecting piece, a shielding piece is installed on the second connecting piece, and a disc spring is installed between the second connecting piece and the first connecting piece. Through the synergistic effect of the disc spring group and the damper, the axial impact energy is nonlinearly absorbed, the radial self-adaptive alignment of the ball assembly is matched, the multidirectional load of the drill pipe in the complex stratum is effectively balanced, the gap adjustment function of the inclined surface of the shielding piece and the reamer can dynamically optimize the mud pressure distribution, the axial-radial composite anti-sticking mechanism is formed by combining the reaming cutting and the ball drag reduction, and the probability of sticking is significantly reduced.

Description

Technical Field

[0001] This invention relates to the field of deep well drilling technology, and in particular to a deep well drilling anti-sticking buffer device. Background Technology

[0002] In traditional deep well drilling operations, stuck pipe problems have long constrained construction efficiency and safety. Existing anti-sticking devices mostly employ a single buffer structure, such as rigid springs or hydraulic dampers. While these can partially alleviate axial impact, they are insufficient to cope with sudden radial loads and the risk of cuttings accumulation in complex formations. Conventional reamers only enlarge the wellbore diameter by fixing the toothed ring, lacking dynamic adjustment capabilities. In fractured zones or hard rock formations, poor cuttings removal can easily lead to repeated sticking. Furthermore, the sealing design at the drill pipe connection often suffers from accelerated component wear due to mud leakage, affecting service life. In addition, most devices adopt an integral structure, requiring disassembly of the entire unit for maintenance, resulting in high replacement costs.

[0003] Therefore, a deep well drilling anti-stuck-drill buffer device is now being developed to address the above problems. Summary of the Invention

[0004] To overcome the shortcomings of existing devices that mostly use a single buffer structure, which can partially alleviate axial impact but is difficult to cope with sudden radial loads and cuttings accumulation risks in complex formations, conventional reamers only enlarge the well diameter by fixing the toothed ring and lack dynamic adjustment capabilities. In fractured zones or hard rock formations, they are prone to repeated stuck drill bits due to poor cuttings removal. Furthermore, the sealing design at the drill pipe connection often accelerates component wear due to mud leakage, affecting service life. In addition, most devices adopt an integral structure, which requires disassembly of the entire machine for maintenance and has high replacement costs. This invention provides a deep well drilling anti-stuck drill bit buffer device.

[0005] The technical solution of this invention is: a deep well drilling anti-sticking buffer device, comprising:

[0006] A first connector, wherein a threaded groove is provided in the upper part of the first connector;

[0007] A first through hole is provided inside the first connector;

[0008] A limiting block is installed at the lower part of the first connecting member;

[0009] The second connector is slidably connected to the lower part of the first connector, and a threaded groove is provided in the middle part of the second connector.

[0010] A shielding component, which is mounted on the second connecting component;

[0011] A disc spring, wherein the disc spring is installed between the second connector and the first connector;

[0012] A flow channel is provided on the outside of the first connector.

[0013] In one embodiment, it also includes:

[0014] A hole expander, which is threadedly mounted on the threaded groove of the first connector;

[0015] Discharge hole, wherein the discharge hole is provided on the expander;

[0016] The second through hole is disposed inside the hole expander and communicates with the first through hole.

[0017] In one embodiment, it also includes:

[0018] Mounting base, the mounting base being mounted on the shielding member;

[0019] A counterweight, which is snapped onto the corresponding mounting base;

[0020] Fasteners are threadedly connected to the corresponding counterweights and to the corresponding mounting bases.

[0021] In one embodiment, it also includes:

[0022] An empty cylinder is installed on the outside of the reamer;

[0023] The third connecting member is slidably connected to the corresponding empty cylinder;

[0024] Ball bearings, each of which is rotatably connected to the corresponding third connector;

[0025] Springs, all of which are installed between the corresponding third connector and the hollow cylinder.

[0026] In one embodiment, an installation port is also included, which is located on the outside of the reamer to facilitate quick installation of the reamer by the operator.

[0027] In one embodiment, a sealing ring is also included, which is disposed at the connection between the first connector and the second connector.

[0028] In one embodiment, the flow channel includes a wide channel and a narrow channel, with the bottom of the flow channel being a wide channel and the top of the flow channel being a narrow channel.

[0029] In one embodiment, the discharge hole includes a wide hole and a narrow hole, with the inner side of the discharge hole being a wide hole and the outer side of the discharge hole being a narrow hole.

[0030] In one embodiment, the shielding member is provided with a beveled structure that conforms to the second connector.

[0031] In one embodiment, dampers are also included, all of which are installed within the third connector.

[0032] By adopting the above technical solution, the advantages of the present invention are as follows:

[0033] 1. This invention achieves nonlinear absorption of axial impact energy through the synergistic effect of disc spring assembly and damper. Combined with the radial adaptive self-alignment of ball bearing assembly, it effectively balances the multi-directional load of drill pipe in complex formations. The gap adjustment function between the inclined surface of the shielding component and the reamer can dynamically optimize the mud pressure distribution. Combined with reaming cutting and ball bearing drag reduction, it forms an axial-radial composite unsticking mechanism, which significantly reduces the probability of stuck drill.

[0034] 2. This invention improves the efficiency of mud cuttings carrying by combining a gradient flow channel with a Venturi effect discharge hole. The alternating wide and narrow channel structure can accelerate the suspension and transportation of rock cuttings and refine the particles to reduce pumping resistance. The annular gap layout of the expander and the hollow cylinder assembly further enhances the well wall dressing and rock cuttings guiding capacity, avoiding the risk of secondary stuck drill bit caused by local accumulation.

[0035] 3. The present invention supports the rapid disassembly and assembly of key components through the design of a split-type expander, replaceable counterweight, and independent empty cylinder assembly, reducing downtime for maintenance. The redundant protection of the sealing ring and self-cleaning flow channel prevents mud from entering the buffer chamber, significantly extending the service life of core components such as disc springs and dampers, and reducing overall operation and maintenance costs. Attached Figure Description

[0036] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0037] Figure 2 This is a schematic diagram of the structure of the present invention.

[0038] Figure 3 This is a schematic diagram of the first partial three-dimensional structure of the present invention.

[0039] Figure 4 This is a schematic diagram of a partial cross-sectional structure of the first embodiment of the present invention.

[0040] Figure 5 This is a schematic diagram of a partial cross-sectional three-dimensional structure of the present invention.

[0041] Figure 6 This is a partial unfolded three-dimensional structural diagram of the present invention.

[0042] Figure 7 This is a schematic diagram of a second partial cross-sectional three-dimensional structure of the present invention.

[0043] Figure 8 This is a schematic diagram of the second partial three-dimensional structure of the present invention.

[0044] Figure 9 This is a schematic diagram of a second partial cross-sectional structure of the present invention.

[0045] In the attached drawings, the following are the reference numerals: 1-first connector, 2-first through hole, 3-limiting block, 4-second connector, 5-blocking component, 6-disc spring, 7-flow groove, 71-wide groove, 72-narrow groove, 8-expander, 9-discharge hole, 91-wide hole, 92-narrow hole, 10-second through hole, 11-mounting base, 12-counterweight, 13-fastener, 14-empty cylinder, 15-third connector, 16-ball bearing, 17-spring, 18-damper, 19-mounting port, 20-sealing ring. Detailed Implementation

[0046] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0047] A deep well drilling anti-sticking buffer device, such as Figures 1-9 As shown, the device includes a first connector 1 with a threaded groove in its upper part, a first through hole 2 inside the first connector 1, a limiting block 3 installed at the lower part of the first connector 1, a second connector 4 slidably connected to the lower part of the first connector 1 with a threaded groove in its middle, a shielding member 5 installed on the second connector 4 with an inclined structure that fits the second connector 4, a disc spring 6 installed between the second connector 4 and the first connector 1, a flow groove 7 located on the outside of the first connector 1, the flow groove 7 including a wide groove 71 and a narrow groove 72, the bottom of the flow groove 7 being the wide groove 71 and the top of the flow groove 7 being the narrow groove 72, a reamer 8 threadedly installed on the threaded groove of the first connector 1, and a discharge hole 9 located on the reamer 8, the discharge hole 9 including a wide hole 91 and a narrow hole 92, the inner side of the discharge hole 9 being the wide hole 91. The outer side of the feed hole 9 is a narrow hole 92. The second through hole 10 is set inside the expander 8 and communicates with the first through hole 2. The mounting base 11 is installed on the shielding part 5. The counterweight 12 is snapped onto the corresponding mounting base 11. The fastener 13 is threadedly connected to the corresponding counterweight 12 and threadedly connected to the corresponding mounting base 11. The empty cylinder 14 is installed on the outside of the expander 8. The third connecting parts 15 are all slidably connected to the corresponding empty cylinder 14. The balls 16 are all rotatably connected to the corresponding third connecting parts 15. The springs 17 are all installed between the corresponding third connecting parts 15 and the empty cylinder 14. The dampers 18 are all installed inside the third connecting parts 15. The mounting port 19 is set on the outside of the expander 8 to facilitate quick installation of the expander 8 by the operator. The sealing ring 20 is set at the connection between the first connecting part 1 and the second connecting part 4.

[0048] It should be noted that the main body of the device consists of a sliding fit structure formed by the first connecting member 1 and the second connecting member 4. When the drill pipe encounters a sudden change in rock resistance, the second connecting member 4 slides upward along the inner wall of the first connecting member 1. At this time, the disc spring 6 set installed between the two connecting members is compressed, absorbing axial impact energy through elastic deformation, thus preventing instantaneous overload of the drill bit. The superimposed design of the disc spring 6 provides nonlinear buffering characteristics: flexible buffering is achieved in the initial compression stage (low load), and excessive displacement is suppressed through increasing stiffness in the later high load stage, thereby balancing the impact force and stroke limitation. The flow groove 7 on the outside of the second connecting member 4 (gradual design of wide groove 71 and narrow groove 72) forms a dynamic fit with the mud flow in the well: when the drill pipe descends, the mud flows in rapidly from the bottom of the wide groove 71, reducing fluid resistance; when it ascends, the top of the narrow groove 72 limits the backflow velocity, forming a local negative pressure to assist in the lifting of drill cuttings. When the limiting block 3 at the bottom of the first connecting member 1 contacts the sliding end face of the second connecting member 4, it triggers a mechanical hard limit to prevent the disc spring 6 from being damaged by overtravel.

[0049] It should be noted that the reamer 8, which is threaded to the top of the first connector 1, has a dual function: firstly, it enlarges the well wall diameter through the outer cutting teeth, reducing the frictional contact area between the drill bit and the well wall; secondly, the internal discharge hole 9 (with a wide inner and narrow outer structure) utilizes the Venturi effect to accelerate the discharge of drilling cuttings carried by the mud. The wide inlet 91 reduces fluid resistance, and the narrow outlet 92 increases the flow velocity, forming a directional scouring force to prevent rock cuttings from accumulating inside the device. The second through hole 10 inside the reamer 8 communicates with the first through hole 2 of the first connector 1 to form the main mud channel, ensuring drilling fluid circulation efficiency. The mounting port 19 is designed on the outside of the reamer 8, allowing for quick disassembly and replacement of worn parts. The external hollow cylinder 14 forms an annular gap with the reamer 8, and the ball bearings 16 on the third connector 15 roll into contact with the well wall, reducing lateral friction. When the well wall is irregular, the third connector 15 is subjected to radial force to compress the internal spring 17, while the damper 18 absorbs high-frequency vibrations, achieving an adaptive self-aligning function and avoiding the risk of stuck drill bit caused by uneven wear.

[0050] It should be noted that the shielding member 5 installed on the second connector 4 forms an adjustable flow guiding zone with the outer wall of the reamer 8 through its inclined structure. When the drilling pressure increases, the second connector 4 moves upward, reducing the gap between the inclined surface of the shielding member 5 and the reamer 8, limiting the mud flow to increase the bottom hole pressure and enhance the cuttings removal capacity. Conversely, under low drilling pressure, the gap widens, reducing circulation resistance. The counterweight 12 is engaged with the shielding member 5 through the mounting base 11, and the number of counterweights can be adjusted according to the well depth and rock hardness: increasing the counterweight can increase the overall inertia of the device and suppress the longitudinal vibration of the drill pipe; reducing the counterweight enhances the dynamic response sensitivity to complex formations. The fastener 13 uses a two-way threaded locking mechanism to ensure that the counterweight 12 has no risk of loosening under strong vibration conditions.

[0051] It should be noted that the sealing ring 20 at the junction of the first connector 1 and the second connector 4 isolates the mud channel from the buffer chamber, preventing high-pressure fluid from seeping in and causing the disc spring 6 to rust or get stuck. The design of the wide and narrow gradient of the flow channel 7 and the discharge hole 9 further optimizes the fluid dynamics characteristics: the drilling fluid forms a vortex in the wide channel 71 area to assist in the suspension of rock cuttings, while the narrow channel 72 section refines the particles through high-speed shearing, reducing pumping energy consumption. When the drill bit gets stuck, the elastic energy stored in the disc spring 6 is released, pushing the second connector 4 to rebound and helping the drill pipe to get out of the jam. At the same time, the reamer 8 continuously cuts and expands the annular space clearance, which, together with the radial buffer of the ball bearing 16 assembly, forms an "axial-radial" composite unblocking mechanism. The combination design of the spring 17 and the damper 18 in the empty cylinder 14 can absorb the high-frequency vibration of the well wall impact and release energy through damping delay, avoiding structural fatigue caused by resonance.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A deep well drilling anti-sticking buffer device, characterized in that: Including: The first connector (1) has a threaded groove in its upper part; The first through hole (2) is disposed in the first connector (1); Limiting block (3), the limiting block (3) is installed on the lower part of the first connecting member (1); The second connector (4) is slidably connected to the lower part of the first connector (1), and a threaded groove is provided in the middle of the second connector (4); A shielding member (5) is mounted on the second connector (4); Disc spring (6), which is installed between the second connector (4) and the first connector (1); A flow channel (7) is provided on the outside of the first connector (1); It also includes a hole expander (8), which is threadedly mounted on the threaded groove of the first connector (1); Discharge hole (9), the discharge hole (9) is provided on the expander (8); The second through hole (10) is disposed inside the hole expander (8) and is connected to the first through hole (2); It also includes a mounting base (11) which is mounted on the shield (5); A counterweight (12) is snapped onto the corresponding mounting base (11); Fastener (13) is threadedly connected to the corresponding counterweight (12) and threadedly connected to the corresponding mounting base (11).

2. The deep well drilling anti-sticking buffer device as described in claim 1, characterized in that: It also includes: Empty cylinder (14), the empty cylinder (14) is installed on the outside of the expander (8); The third connector (15) is slidably connected to the corresponding empty cylinder (14); Ball bearings (16), each of which is rotatably connected to the corresponding third connector (15); Springs (17) are installed between the corresponding third connector (15) and the empty cylinder (14).

3. The deep well drilling anti-sticking buffer device as described in claim 2, characterized in that: It also includes an installation port (19), which is located on the outside of the reamer (8) to facilitate the operator to quickly install the reamer (8).

4. The deep well drilling anti-sticking buffer device as described in claim 3, characterized in that: It also includes a sealing ring (20), which is disposed at the connection between the first connector (1) and the second connector (4).

5. A deep well drilling anti-sticking buffer device as described in claim 4, characterized in that: The flow channel (7) includes a wide channel (71) and a narrow channel (72), with the bottom of the flow channel (7) being the wide channel (71) and the top of the flow channel (7) being the narrow channel (72).

6. A deep well drilling anti-sticking buffer device as described in claim 5, characterized in that: The discharge hole (9) includes a wide hole (91) and a narrow hole (92). The inner side of the discharge hole (9) is a wide hole (91), and the outer side of the discharge hole (9) is a narrow hole (92).

7. A deep well drilling anti-sticking buffer device as described in claim 6, characterized in that: The shielding member (5) is provided with an inclined structure that fits the second connecting member (4).

8. A deep well drilling anti-sticking buffer device as described in claim 7, characterized in that: It also includes dampers (18), all of which are installed inside the third connector (15).

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