Buffering device for preventing drilling tool from being stuck in deep well drilling

Abstract

The invention relates to the technical field of deep well drilling, in particular to a deep well drilling anti-jamming buffer device which comprises a first connecting piece, a threaded groove is formed in the upper portion in the first connecting piece, a first through hole is formed in the first connecting piece, and a limiting block is installed on the lower portion of the first connecting piece. The second connecting piece is connected to the lower portion of the first connecting piece in a sliding mode, a threaded groove is formed in the middle of the second connecting piece, the shielding piece is installed on the second connecting piece, and the disc spring is installed between the second connecting piece and the first connecting piece. Through the synergistic effect of the disc spring set and the damper, nonlinear absorption of axial impact energy is achieved, radial self-adaptive aligning of the ball assembly is matched, the multidirectional load of the drill rod in a complex stratum and the gap adjusting function of the inclined face of the shielding piece and the reamer are effectively balanced, mud pressure distribution can be dynamically optimized, and the drilling efficiency is improved. And through combination of reaming cutting and ball resistance reduction, an axial-radial composite jam releasing mechanism is formed, and the probability of jamming of the drill is remarkably reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of deep well drilling, and particularly to an anti-sticking drill buffer device for deep well drilling. Background Art

[0002] In traditional deep well drilling operations, the problem of drill sticking has long restricted the construction efficiency and safety. Most existing anti-sticking drill devices adopt a single buffer structure, such as a rigid spring or a hydraulic damper. Although they can partially relieve the axial impact, it is difficult to cope with the sudden radial load and the risk of cuttings accumulation in complex strata. Conventional reamers only enlarge the well diameter through a fixed tooth ring and lack the ability of dynamic adjustment. In fractured zones or hard rock formations, repeated drill sticking is likely to occur due to poor chip removal. In addition, the seal design at the drill pipe connection often accelerates the wear of components due to mud leakage, affecting the service life. Moreover, most devices adopt an integral structure, and the whole machine needs to be disassembled during maintenance, resulting in high replacement costs.

[0003] Therefore, in view of the above problems, an anti-sticking drill buffer device for deep well drilling is now developed. Summary of the Invention

[0004] In order to overcome the shortcomings that most existing devices adopt a single buffer structure, although they can partially relieve the axial impact, it is difficult to cope with the sudden radial load and the risk of cuttings accumulation in complex strata. Conventional reamers only enlarge the well diameter through a fixed tooth ring and lack the ability of dynamic adjustment. In fractured zones or hard rock formations, repeated drill sticking is likely to occur due to poor chip removal. In addition, the seal design at the drill pipe connection often accelerates the wear of components due to mud leakage, affecting the service life. Moreover, most devices adopt an integral structure, and the whole machine needs to be disassembled during maintenance, resulting in high replacement costs, the present invention provides an anti-sticking drill buffer device for deep well drilling.

[0005] The technical solution of the present invention is: an anti-sticking drill buffer device for deep well drilling, comprising:

[0006] A first connecting member, in which a threaded groove is provided in the upper part;

[0007] A first through hole, which is provided in the first connecting member;

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

[0009] A second connecting member, which is slidably connected to the lower part of the first connecting member, and a threaded groove is provided in the middle of the second connecting member;

[0010] A shielding member, which is installed on the second connecting member;

[0011] A disc spring, which is installed between the second connecting member and the first connecting member;

[0012] Flow channel, the flow channel is arranged outside the first connecting piece.

[0013] In one embodiment, it further includes:

[0014] Reamer, the reamer is threadedly installed on the threaded groove of the first connecting piece;

[0015] Discharge hole, the discharge hole is arranged on the reamer;

[0016] Second through hole, the second through hole is arranged inside the reamer, and the second through hole communicates with the first through hole.

[0017] In one embodiment, it further includes:

[0018] Mounting seat, the mounting seat is installed on the shielding piece;

[0019] Counterweight, the counterweight is snap-fitted on the corresponding mounting seat;

[0020] Fastener, the fastener is threadedly connected to the corresponding counterweight, and the fastener is threadedly connected to the corresponding mounting seat.

[0021] In one embodiment, it further includes:

[0022] Empty cylinder, the empty cylinder is installed outside the reamer;

[0023] Third connecting piece, the third connecting pieces are all slidably connected to the corresponding empty cylinders;

[0024] Ball, the balls are all rotatably connected to the corresponding third connecting pieces;

[0025] Spring, the springs are all installed between the corresponding third connecting pieces and the empty cylinders.

[0026] In one embodiment, it further includes a mounting opening, the mounting opening is arranged outside the reamer, facilitating the operator to quickly install the reamer.

[0027] In one embodiment, it further includes a sealing ring, the sealing ring is arranged at the connection between the first connecting piece and the second connecting piece.

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

[0029] In one embodiment, the discharge hole includes a wide hole and a narrow hole, the inner sides of the discharge holes are all wide holes, and the outer sides of the discharge holes are all narrow holes.

[0030] In one embodiment, the shielding member is provided with an inclined surface structure that fits the second connecting member.

[0031] In one embodiment, a damper is further included, and the dampers are all installed in the third connecting member.

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

[0033] 1. Through the synergistic effect of the disc spring group and the damper, the present invention realizes the non-linear absorption of axial impact energy. Combined with the radial self-adaptive alignment of the ball assembly, it effectively balances the multi-directional loads of the drill pipe in complex formations. The gap adjustment function between the inclined surface of the shielding member and the reamer can dynamically optimize the mud pressure distribution. Combining reaming cutting and ball drag reduction forms an axial-radial composite pipe un-sticking mechanism, significantly reducing the probability of pipe sticking.

[0034] 2. Through the cooperative design of the gradually changing flow channel and the venturi effect discharge hole, the present invention improves the mud cuttings carrying efficiency. The wide and narrow alternating slot hole structure can not only accelerate the suspension and transportation of cuttings, but also refine the particles to reduce the pumping resistance. The annular gap layout between the reamer and the empty cylinder assembly further strengthens the wellbore trimming and cuttings diversion capabilities, avoiding the risk of secondary pipe sticking caused by local accumulation.

[0035] 3. Through the design of the split reamer, replaceable counterweight blocks and independent empty cylinder assembly, the present invention supports the rapid disassembly and assembly of key components, reduces the downtime for maintenance. The redundant protection of the sealing ring and the self-cleaning flow channel isolates the intrusion of mud into the buffer chamber, significantly prolonging the service life of core components such as disc springs and dampers, and reducing the comprehensive operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a three-dimensional structure schematic diagram of the present invention.

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

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

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

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

[0041] Figure 6 It is a partial unfolded three-dimensional structure schematic diagram of the present invention.

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

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

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

[0045] In the attached drawing reference numerals: 1 - the first connecting member, 2 - the first through hole, 3 - the limiting block, 4 - the second connecting member, 5 - the shielding member, 6 - the disc spring, 7 - the flow channel, 71 - the wide groove, 72 - the narrow groove, 8 - the reamer, 9 - the discharge hole, 91 - the wide hole, 92 - the narrow hole, 10 - the second through hole, 11 - the mounting seat, 12 - the counterweight, 13 - the fastener, 14 - the hollow cylinder, 15 - the third connecting member, 16 - the ball, 17 - the spring, 18 - the damper, 19 - the mounting port, 20 - the sealing ring. Detailed Description of the Invention

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

[0047] A deep well drilling anti-sticking and buffering device, as Figures 1-9 shown, includes a first connecting member 1. A threaded groove is provided in the upper part of the first connecting member 1. The first through hole 2 is provided in the first connecting member 1. The limiting block 3 is installed at the lower part of the first connecting member 1. The second connecting member 4 is slidably connected to the lower part of the first connecting member 1. A threaded groove is provided in the middle of the second connecting member 4. The shielding member 5 is installed on the second connecting member 4. The shielding member 5 is provided with an inclined surface structure that fits the second connecting member 4. The disc spring 6 is installed between the second connecting member 4 and the first connecting member 1. The flow channel 7 is provided on the outer side of the first connecting member 1. The flow channel 7 includes a wide groove 71 and a narrow groove 72. The bottom of the flow channel 7 is the wide groove 71, and the top of the flow channel 7 is the narrow groove 72. The reamer 8 is threadedly installed on the threaded groove of the first connecting member 1. The discharge hole 9 is provided on the reamer 8. The discharge hole 9 includes a wide hole 91 and a narrow hole 92. The inner sides of the discharge holes 9 are all wide holes 91, and the outer sides of the discharge holes 9 are all narrow holes 92. The second through hole 10 is provided inside the reamer 8. The second through hole 10 communicates with the first through hole 2. The mounting seat 11 is installed on the shielding member 5. The counterweight 12 is clamped on the corresponding mounting seat 11. The fastener 13 is threadedly connected to the corresponding counterweight 12. The fastener 13 is threadedly connected to the corresponding mounting seat 11. The hollow cylinder 14 is installed on the outer side of the reamer 8. The third connecting members 15 are all slidably connected to the corresponding hollow cylinders 14. The balls 16 are all rotatably connected to the corresponding third connecting members 15. The springs 17 are all installed between the corresponding third connecting members 15 and the hollow cylinders 14. The dampers 18 are all installed inside the third connecting members 15. The mounting port 19 is provided on the outer side of the reamer 8 to facilitate the operator to quickly install the reamer 8. The sealing ring 20 is provided at the connection between the first connecting member 1 and the second connecting member 4.

[0048] It should be noted that the main body of the device consists of a sliding fit structure formed by a first connecting member 1 and a second connecting member 4. When the drill pipe encounters the sudden resistance of the rock formation, the second connecting member 4 slides upward along the inner wall of the first connecting member 1. At this time, the 6 groups of disc springs 6 installed between the two connecting members are compressed, and the axial impact energy is absorbed through elastic deformation to avoid instantaneous overload of the drill bit. The superimposed design of the disc springs 6 can provide non-linear 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, so as to balance the impact force and stroke limit. The flow channel 7 (gradual design of the wide channel 71 and the narrow channel 72) on the outer side of the second connecting member 4 forms a dynamic cooperation with the mud flow in the well: when the drill pipe descends, the mud quickly flows in from the bottom of the wide channel 71 to reduce the fluid resistance; when ascending, the top of the narrow channel 72 restricts the reflux speed to form a local negative pressure to assist in lifting the drill cuttings. When the limit block 3 at the lower part of the first connecting member 1 contacts the sliding end face of the second connecting member 4, mechanical hard limit is triggered to prevent the disc springs 6 from being damaged due to over-travel.

[0049] It should be noted that the reamer 8 threadedly connected to the top of the first connecting member 1 undertakes dual functions: firstly, the diameter of the wellbore is enlarged through the outer cutting teeth to reduce the friction contact area between the drill bit and the wellbore; secondly, the internal discharge hole 9 (inner-wide and outer-narrow structure) utilizes the Venturi effect to accelerate the discharge of the mud carrying the drill cuttings. The wide hole 91 entrance reduces the fluid resistance, and the narrow hole 92 exit increases the flow rate to form a directional scouring force to prevent rock cuttings from accumulating inside the device. The second through hole 10 inside the reamer 8 is connected to the first through hole 2 of the first connecting member 1 to form a main mud channel to ensure the circulation efficiency of the drilling fluid. The installation port 19 is designed on the outer side of the reamer 8 to allow quick disassembly and replacement of worn parts; the external empty cylinder 14 forms an annular gap with the reamer 8, and the rolling contact with the wellbore is achieved through the balls 16 on the third connecting member 15 to reduce the lateral friction. When the wellbore is irregular, the third connecting member 15 is compressed by the radial force to compress the internal spring 17, and at the same time, the damper 18 absorbs high-frequency vibrations to achieve the self-adaptive centering function and avoid the risk of sticking caused by eccentric wear.

[0050] It should be noted that the shielding member 5 installed on the second connecting member 4 forms a gap-adjustable diversion area with the outer wall of the reamer 8 through an inclined surface structure. When the drilling pressure increases, the second connecting member 4 moves upward, reducing the gap between the inclined surface of the shielding member 5 and the reamer 8 to limit the mud flow rate to increase the bottom hole pressure and enhance the chip removal ability; conversely, the gap expands under the low drilling pressure state to reduce the circulation resistance. The counterweight block 12 is clamped to the shielding member 5 through the mounting seat 11, and the number of counterweights can be adjusted according to the well depth and the rock formation 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 two-way thread locking to ensure that the counterweight block 12 has no risk of loosening under strong vibration conditions.

[0051] It should be noted that the sealing ring 20 at the joint of the first connecting piece 1 and the second connecting piece 4 isolates the mud channel from the buffer chamber, preventing high-pressure fluid from infiltrating and causing the disc spring 6 to rust or jam. The gradually changing design of the width of the flow groove 7 and the discharge hole 9 further optimizes the hydrodynamic characteristics: the drilling fluid forms eddies in the wide groove 71 area to assist in suspending cuttings, and the narrow groove 72 section refines particles through high-speed shearing, reducing the pumping energy consumption. When the drill bit gets stuck, the elastic energy storage of the disc spring 6 is released to push the second connecting piece 4 to rebound, assisting the drill pipe to get out of the stuck state; at the same time, the reamer 8 continuously cuts to expand the annular space gap, and cooperates with the radial buffer of the ball 16 assembly to form an "axial-radial" composite stuck release mechanism. The combined design of the spring 17 and the damper 18 in the empty cylinder 14 can not only absorb the high-frequency vibration of the wellbore impact, but also delay the release of energy through damping, avoiding structural fatigue caused by resonance.

[0052] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sticking prevention and buffering device for deep well drilling, characterized in that: It includes: A first connecting piece (1), with a threaded groove arranged in the upper part of the first connecting piece (1); A first through hole (2), which is arranged in the first connecting piece (1); A limiting block (3), which is installed at the lower part of the first connecting piece (1); A second connecting piece (4), which is slidably connected to the lower part of the first connecting piece (1), and a threaded groove is arranged in the middle of the second connecting piece (4); A shielding piece (5), which is installed on the second connecting piece (4); A disc spring (6), which is installed between the second connecting piece (4) and the first connecting piece (1); A flow-through groove (7), which is arranged on the outer side of the first connecting piece (1).

2. The anti-sticking buffering device for deep well drilling according to claim 1, characterized in that: It further includes: A reamer (8), which is threadedly installed on the threaded groove of the first connecting piece (1); A discharge hole (9), which is arranged on the reamer (8); A second through hole (10), which is arranged inside the reamer (8), and the second through hole (10) is communicated with the first through hole (2).

3. The anti-sticking buffering device for deep well drilling according to claim 2, wherein: It further includes: A mounting seat (11), which is installed on the shielding piece (5); A counterweight (12), which is clamped on the corresponding mounting seat (11); A fastener (13), which is threadedly connected to the corresponding counterweight (12), and the fastener (13) is threadedly connected to the corresponding mounting seat (11).

4. The anti-sticking buffering device for deep well drilling according to claim 3, wherein: It further includes: A hollow cylinder (14), which is installed on the outer side of the reamer (8); A third connecting piece (15), which is slidably connected to the corresponding hollow cylinder (14); A ball (16), which is rotatably connected to the corresponding third connecting piece (15); A spring (17), which is installed between the corresponding third connecting piece (15) and the hollow cylinder (14).

5. The buffer device for preventing stuck drill pipes during deep well drilling according to claim 4, characterized in that: It further includes a mounting port (19), which is arranged on the outer side of the reamer (8) to facilitate the operator to quickly install the reamer (8).

6. The anti-sticking buffer device for deep well drilling according to claim 5, characterized in that: It further includes a sealing ring (20), which is arranged at the connection between the first connecting piece (1) and the second connecting piece (4).

7. The anti-sticking buffering device for deep well drilling according to claim 6, characterized in that: The flow-through groove (7) includes a wide groove (71) and a narrow groove (72), the bottom of the flow-through groove (7) is the wide groove (71), and the top of the flow-through groove (7) is the narrow groove (72).

8. The anti-sticking buffering device for deep well drilling according to claim 7, characterized in that: The discharge hole (9) includes a wide hole (91) and a narrow hole (92), the inner sides of the discharge holes (9) are wide holes (91), and the outer sides of the discharge holes (9) are narrow holes (92).

9. The anti-sticking buffering device for deep well drilling according to claim 1, characterized in that: ​ 10. A deep well drilling anti-sticking buffer device according to claim 4, characterized in that: ​

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