Coring tool with rotary shunting assembly
By incorporating a rotary diversion assembly in the core sampling tool, the inner and outer cylinders rotate relative to each other and form an annular flow channel. The drilling fluid is discharged through the inclined hole, which solves the problem of drilling fluid scouring the core and achieves core protection and tool durability.
Patent Information
- Application Number
- CN202422252617.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-13
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-09-13
AI Technical Summary
In existing coring tools, drilling fluid is easily discharged from the central axis of the tool, leading to core erosion and contamination. The rotating and diverting effect of the drilled rock material further exacerbates the problems of drilling fluid erosion and contamination of the core.
Design a coring tool with a rotating flow splitter assembly. By setting a bearing assembly between the upper connector and the inner cylinder, the inner and outer cylinders can rotate relative to each other, forming an annular flow channel between the inner and outer cylinders. Drilling fluid enters the annular flow channel through an inclined hole and is discharged from the end of the coring drill bit. The central tube hole is sealed with a plugging ball to prevent drilling fluid from being discharged directly from the central shaft.
This allows drilling fluid to be discharged from the circumference of the core sampling tool, avoiding erosion and contamination of the core, and improving the service life of the core sampling tool and the integrity of the core.
Smart Images
Figure CN223707572U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of petroleum drilling equipment, and particularly relates to a coring tool with a rotary shunt assembly. BACKGROUND
[0002] In the exploration and development of oil and gas, it is often necessary to take out certain rocks from the ground to analyze the oil, gas and water content and their distribution in the underground reservoir. This work is called drilling coring operation, which mainly uses coring tools to drill rock samples in the formation. The tool used to complete the coring operation is called a coring tool. The most commonly used coring tool currently mainly consists of an upper joint, an outer tube (which transmits torque and applies drilling pressure to the coring bit, rotates with the drilling tool, and drills the core), an inner and outer tube connecting assembly (a rotary shunt assembly), an inner tube and a core cutting assembly (a container that cuts and contains the core, does not rotate with the drilling tool, and prevents damage to the core), and a coring bit. The part connecting the outer tube and the inner tube often needs to rotate relatively and shunt the drilling fluid. This part is called a rotary shunt assembly. SUMMARY
[0003] The utility model discloses a coring tool with a rotary shunt assembly, which is provided with the most practical and simple rotary shunt assembly structure. The rotary shunt assembly of this structure can not only keep the outer tube and the inner tube rotating relatively for a long time, but also can make the drilling fluid shunt from the blocking center pipe hole of the coring tool to the annular space between the inner and outer tubes, preventing the drilling fluid from washing and polluting the core.
[0004] The utility model discloses a coring tool with a rotary shunt assembly, which is provided with the most practical and simple rotary shunt assembly structure. The rotary shunt assembly of this structure can not only keep the outer tube and the inner tube rotating relatively for a long time, but also can make the drilling fluid shunt from the blocking center pipe hole of the coring tool to the annular space between the inner and outer tubes, preventing the drilling fluid from washing and polluting the core.
[0005] The upper joint is used for connecting with the external rotary power component and conveying the drilling fluid.
[0006] The outer tube is fixedly connected at one end to the upper joint, and the other end of the outer tube is provided with a coring bit.
[0007] The inner tube is rotatably connected inside the upper joint through a bearing assembly, the inner tube is accommodated in the outer tube, an annular flow channel is formed between the outer wall of the inner tube and the inner wall of the outer tube, one end of the annular flow channel is communicated with an inclined hole formed in the inner tube, the other end of the annular flow channel is communicated with a drainage hole arranged at the end of the coring bit, and a blocking ball of a blocking center pipe hole is arranged in the inner tube.
[0008] Further, the bearing assembly comprises a bearing tightening cap arranged in the upper joint, and a bearing ring set arranged between the bearing tightening cap and the inner wall of the upper joint, the bearing tightening cap is fixedly connected with the inner cylinder, and the inner cylinder is provided with a bearing tightening cap between the inner cylinder and the upper joint, and the bearing tightening cap is fixedly connected with the upper joint.
[0009] Further, the bearing ring set comprises a first bearing track, a sliding ball and a second bearing track arranged between the inner wall of the upper joint and the outer wall of the bearing tightening cap, opposite sides of the first bearing track and the second bearing track are provided with ring grooves, and the sliding ball is arranged in the ring grooves.
[0010] Further, the end of the inner cylinder is arranged in abutment with one side of the second bearing track.
[0011] Further, the inclined holes arranged in the inner cylinder are uniformly arranged in the circumferential direction of the inner cylinder, and the end of the central pipe hole of the inner cylinder is provided with a first annular stepped groove.
[0012] Further, a first gap is arranged between the bearing tightening cap and the inner wall of the upper joint, a second gap is arranged between the bearing tightening cap and the inner cylinder, the first gap is communicated with the inside of the upper joint, and the second gap is communicated with the annular flow channel.
[0013] Further, the bearing tightening cap is threadedly connected with the inner cylinder, and the bearing tightening cap is threadedly connected with the upper joint.
[0014] Further, the inside of the upper joint is provided with a second annular stepped groove, the end of the bearing tightening cap is matched with the second annular stepped groove and arranged in the second annular stepped groove.
[0015] The beneficial effects of the utility model are embodied in:
[0016] 1. The utility model discloses a upper joint is set up, and the outer tube is fixedly connected with one end of upper joint, and the inner tube is rotatably connected in the inside of upper joint through bearing assembly, thereby, when the upper joint is driven to rotate, can drive the inner tube and the outer tube connected with it to rotate, because the inner tube is rotatably connected between the inside of upper joint, thereby the inner tube can relatively rotate with the outer tube, more specifically, because the annular flow channel is formed between the outer wall of inner tube and the inner wall of outer tube, and the annular flow channel is communicated with the inclined hole in the inner tube, thereby, the drilling fluid flowing in the upper joint can enter the annular flow channel through the inclined hole and be discharged from the drainage hole arranged at the end of coring bit, because the blocking ball of blocking central tube hole is arranged in the inner tube, when the drilling fluid with pressure flows in the upper joint and flows out from the other end of the whole coring tool, the liquid pressure acts on the blocking ball, realizes that the blocking ball blocks the central tube hole, and the drilling fluid flows in the annular flow channel between the inside of outer tube and is discharged from the drainage hole arranged at the end of coring bit, thereby, the drilling fluid is discharged from the circumferential direction of the whole coring tool, avoids the problem of flushing and pollution to the drilled core from the position of coring tool central shaft.
[0017] 2. The utility model discloses a bearing assembly is provided with bearing upper tight cap, bearing ring group and bearing lower tight cap, realizes that the inner tube in upper joint is rotatably connected with the upper joint, simultaneously, the outer tube is fixedly connected between the upper joint, thereby the inner tube can relatively rotate with the outer tube, and the outer wall of inner tube is spaced apart between the inner wall of outer tube, forms the annular flow channel, provides that the drilling fluid flows in the upper joint can be transported in the annular flow channel.
[0018] 3. The utility model discloses a first bearing track, sliding ball and second bearing track are arranged in the bearing ring group, so that the upper joint has the function of relative rotation with the bearing upper tight cap, and the first bearing track and the second bearing track are provided with annular grooves, and the sliding ball is arranged in the annular grooves, which is beneficial to the stability and smoothness of rotation.
[0019] 4. The utility model discloses that 2-6 inclined holes are uniformly arranged in the circumferential direction of the inner tube, and the inclined holes are inclinedly arranged in the direction of flow, realizing the flow between the inner tube and the annular flow channel, a first annular step groove is arranged at the end of the central tube hole of the inner tube, which is beneficial to limiting and clamping the blocking ball at the end of the central tube hole of the inner tube when the drilling fluid flows, thereby making the drilling fluid be transported in the annular flow channel through the 2-6 inclined holes.
[0020] 5. In this utility model, since a first gap is provided between the upper tightening cap of the bearing and the inner wall of the upper connector, and a second gap is provided between the lower tightening cap of the bearing and the inner cylinder, the first gap communicates with the interior of the upper connector, and the second gap communicates with the annular flow channel. Thus, the drilling fluid flowing into the upper connector can enter the bearing ring assembly through the first gap and then be discharged from the bearing ring assembly, thereby achieving lubrication treatment of the bearing ring assembly and improving the service life of the bearing ring assembly. Attached Figure Description
[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.
[0022] Figure 1 This is a schematic diagram of the overall structure of the core-taking tool of this utility model;
[0023] Figure 2 This is a schematic diagram of the rotary splitter assembly of this utility model.
[0024] In the attached diagram, 1-upper connector, 2-outer cylinder, 3-core drill bit, 4-bearing assembly, 5-inner cylinder, 6-annular flow channel, 7-inclined hole, 8-drain hole, 9-sealing center tube hole, 10-sealing ball, 11-bearing upper tightening cap, 12-bearing ring assembly, 13-bearing lower tightening cap, 14-first bearing track, 15-sliding ball, 16-second bearing track, 17-annular groove, 18-first annular stepped groove, 19-first gap, 20-second gap, 21-second annular stepped groove. Detailed Implementation
[0025] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.
[0026] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.
[0027] Reference Figure 1 and Figure 2 A coring tool with a rotary splitter assembly, comprising:
[0028] Upper connector 1, which is used for connection with external rotating power components and delivery of drilling fluid;
[0029] An outer cylinder 2 is fixedly connected to one end of the upper joint 1, and a core drill bit 3 is arranged at the other end of the outer cylinder 2.
[0030] An inner cylinder 5 is rotatably connected inside the upper joint 1 through a bearing assembly 4, the inner cylinder 5 is accommodated in the outer cylinder 2, an annular flow channel 6 is formed between the outer wall of the inner cylinder 5 and the inner wall of the outer cylinder 2, one end of the annular flow channel 6 is communicated with an inclined hole 7 arranged in the inner cylinder 5, the other end of the annular flow channel 6 is communicated with a liquid discharge hole 8 arranged at the end of the core drill bit 3, and a blocking ball 10 for blocking a central pipe hole 9 is arranged in the inner cylinder 5.
[0031] The upper joint 1 is arranged, the outer cylinder 2 is fixedly connected to one end of the upper joint 1, and the inner cylinder 5 is rotatably connected inside the upper joint 1 through the bearing assembly 4, so that when the upper joint 1 is driven to rotate, the inner cylinder 5 and the outer cylinder 2 connected thereto can be driven to rotate, and the inner cylinder 5 and the outer cylinder 2 can rotate relative to each other because they are rotatably connected. More specifically, the annular flow channel 6 is formed between the outer wall of the inner cylinder 5 and the inner wall of the outer cylinder 2, and the annular flow channel 6 is communicated with the inclined hole 7 arranged in the inner cylinder 5, so that the drilling fluid flowing into the upper joint 1 can enter the annular flow channel 6 through the inclined hole 7 and be discharged from the liquid discharge hole 8 arranged at the end of the core drill bit 3. Because the blocking ball 10 for blocking the central pipe hole 9 is arranged in the inner cylinder 5, when the drilling fluid with pressure flows into the upper joint 1 and flows out from the other end of the entire coring tool, the liquid pressure acts on the blocking ball 10, the blocking ball 10 blocks the central pipe hole, and the drilling fluid flows into the annular flow channel 6 formed between the inner cylinder 2 and the outer cylinder 2 and is discharged from the liquid discharge hole 8 arranged at the end of the core drill bit 3, so that the drilling fluid is discharged from the circumferential direction of the entire coring tool, avoiding the problem of flushing and contaminating the drilled core from the position of the central axis of the coring tool.
[0032] Preferably, the bearing assembly 4 includes a bearing tightening cap 11 arranged in the upper joint 1 and a bearing ring group 12 arranged between the bearing tightening cap 11 and the inner wall of the upper joint 1, the bearing tightening cap 11 is fixedly connected to the inner cylinder 5, a bearing lower tightening cap 13 is arranged between the inner cylinder 5 and the upper joint 1, and the bearing lower tightening cap 13 is fixedly connected to the upper joint 1.
[0033] It can be understood that, due to the bearing assembly 4 is provided with bearing upper tightening cap 11, bearing ring group 12 and bearing lower tightening cap 13, realize the inner cylinder 5 in the upper joint 1 and the upper joint 1 between the rotating connection, at the same time, the outer cylinder 2 is and the upper joint 1 between fixed connection, thus make the inner cylinder 5 and the outer cylinder 2 can be relatively rotated, and the outer wall of the inner cylinder 5 and the inner wall of the outer cylinder 2 are spaced apart, forming annular flow channel 6, provide the drilling fluid from the upper joint 1 flow into, can be in the annular flow channel 6 in the transportation.
[0034] As preferred, the bearing ring group 12 comprises the first bearing track 14, sliding ball 15 and second bearing track 16 arranged between the inner wall of the upper joint 1 and the outer wall of the bearing upper tightening cap 11, the opposite side of the first bearing track 14 and the second bearing track 16 is provided with ring groove 17, the sliding ball 15 is arranged in the ring groove 17.
[0035] By setting the first bearing track 14, sliding ball 15 and second bearing track 16 in the bearing ring group 12, the upper joint 1 and the bearing upper tightening cap 11 have the function of relative rotation, the first bearing track 14 and the second bearing track 16 are provided with ring groove 17, and the sliding ball 15 is arranged in the ring groove 17, which is conducive to the stability and smoothness of rotation.
[0036] As preferred, the bearing lower tightening cap 13 is arranged on one side of the second bearing track 16 with the end of the inner cylinder 5.
[0037] As preferred, the inclined hole 7 in the inner cylinder 5 is arranged in the circumferential direction of the inner cylinder 5, and the end of the central pipe hole 9 of the inner cylinder 5 is provided with a first annular step groove 18.
[0038] It can be understood that, by arranging 2-6 inclined holes 7 in the circumferential direction of the inner cylinder 5, and arranging the inclined holes 7 inclined to the flow direction, the flow between the inner cylinder 5 and the annular flow channel 6 is realized, and the first annular step groove 18 is arranged at the end of the central pipe hole of the inner cylinder 5, which is conducive to limiting and clamping the blocking ball 10 at the end of the central pipe hole of the inner cylinder 5 when the drilling fluid flows, so that the drilling fluid is discharged from the 2-6 inclined holes 7 to the annular flow channel 6 for transportation.
[0039] As preferred, the first gap 19 is arranged between the bearing upper tightening cap 11 and the inner wall of the upper joint 1, the second gap 20 is arranged between the bearing lower tightening cap 13 and the inner cylinder 5, the first gap 19 is communicated with the inside of the upper joint 1, and the second gap 20 is communicated with the annular flow channel 6.
[0040] As a preferred mode of the embodiment, since the first gap 19 is arranged between the bearing upper cap 11 and the inner wall of the upper joint 1, the second gap 20 is arranged between the bearing lower cap 13 and the inner cylinder 5, the first gap 19 is communicated with the inside of the upper joint 1, and the second gap 20 is communicated with the annular flow channel 6, so that the drilling fluid flowing into the upper joint 1 can enter the bearing ring set 12 through the first gap 19 and then be discharged from the bearing ring set 12, thereby realizing the lubrication treatment of the bearing ring set 12 and improving the service life of the bearing ring set 12.
[0041] Preferably, the bearing upper cap 11 is threadedly connected with the inner cylinder 5, and the bearing lower cap 13 is threadedly connected with the upper joint 1.
[0042] Preferably, the inside of the upper joint 1 is provided with a second annular stepped groove 21, and the end of the bearing upper cap 11 is matched with and placed in the second annular stepped groove 21.
[0043] The working principle and working process of the utility model are as follows:
[0044] The core tool with the rotary shunt assembly provided by the utility model is used as follows: first, the drilling fluid is discharged from the upper joint 1 into the core tool, the inside pipeline of the core tool is flushed, the core tool approaches the rock mass for drilling, at this time, the blocking ball 10 is placed in the inside of the core tool, the blocking ball 10 is blocked in the position of the blocking central pipe hole 9 under the action of the drilling fluid pressure. The drilling fluid flows through the annular flow channel 6 and flows out from the end of the core drill bit 3, when the core drill bit 3 is drilled, the end of the inner cylinder 5 contacts the rock mass, the inner cylinder 5 is stopped from rotating, the outer cylinder 2 is drilled, and the drilling fluid is discharged through the annular flow channel 6.
[0045] The upper joint 1 is arranged, the outer cylinder 2 is fixedly connected to one end of the upper joint 1, and the inner cylinder 5 is rotationally connected to the inside of the upper joint 1 through the bearing assembly 4, so that when the upper joint 1 is rotationally driven, the inner cylinder 5 and the outer cylinder 2 connected therewith can be rotated, the inner cylinder 5 and the outer cylinder 2 can relatively rotate because the inner cylinder 5 and the upper joint 1 are rotationally connected, and more specifically, the annular flow channel 6 is formed between the outer wall of the inner cylinder 5 and the inside of the outer cylinder 2, and the annular flow channel 6 is communicated with the inclined hole 7 arranged in the inner cylinder 5.
[0046] Thus, the drilling fluid flowing from the upper joint 1 can enter the annular flow channel 6 through the inclined hole 7 and be discharged from the discharge hole 8 arranged at the end of the coring bit 3. Since the blocking ball 10 is arranged in the inner cylinder 5 to block the central tube hole 9, when the drilling fluid with pressure flows from the upper joint 1 and flows out from the other end of the whole coring tool, the liquid pressure acts on the blocking ball 10 to achieve the blocking of the central tube hole by the blocking ball 10, and the drilling fluid flows from the annular flow channel 6 formed between the inner part of the outer cylinder 2 to the discharge hole 8 arranged at the end of the coring bit 3, thereby the drilling fluid is discharged from the circumferential direction of the whole coring tool, avoiding the problem of flushing and contamination of the drilled core caused by the discharge from the position of the central axis of the coring tool.
[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.
Claims
1. A coring tool with a rotary diverter assembly, characterized in that, include: Upper connector (1), the upper connector (1) is used for connection with external rotating power components and delivery of drilling fluid; An outer cylinder (2), one end of which is fixedly connected to the upper connector (1), and the other end of which is provided with a core drill bit (3); and The upper connector (1) is rotatably connected to an inner cylinder (5) via a bearing assembly (4). The inner cylinder (5) is housed in the outer cylinder (2). An annular flow channel (6) is formed between the outer wall of the inner cylinder (5) and the interior of the outer cylinder (2). One end of the annular flow channel (6) is connected to an inclined hole (7) in the inner cylinder (5), and the other end of the annular flow channel (6) is connected to a drain hole (8) at the end of the core drill bit (3). A sealing ball (10) for sealing the central tube hole (9) is provided in the inner cylinder (5).
2. The coring tool with a rotary splitter assembly according to claim 1, characterized in that, The bearing assembly (4) includes a bearing upper tightening cap (11) placed in the upper connector (1) and a bearing ring assembly (12) disposed between the bearing upper tightening cap (11) and the inner wall of the upper connector (1). The bearing upper tightening cap (11) is fixedly connected to the inner cylinder (5). A bearing lower tightening cap (13) is disposed between the inner cylinder (5) and the upper connector (1). The bearing lower tightening cap (13) is fixedly connected to the upper connector (1).
3. The coring tool with a rotary splitter assembly according to claim 2, characterized in that, The bearing ring assembly (12) includes a first bearing track (14), a sliding ball (15), and a second bearing track (16) disposed between the inner wall of the upper connector (1) and the outer wall of the bearing upper cap (11). The first bearing track (14) and the second bearing track (16) are provided with ring grooves (17) on opposite sides, and the sliding ball (15) is disposed in the ring groove (17).
4. The coring tool with a rotary splitter assembly according to claim 3, characterized in that, The bearing lower tension cap (13) and the end of the inner cylinder (5) are abutted against one side of the second bearing track (16).
5. The coring tool with a rotary splitter assembly according to claim 1, characterized in that, The inclined holes (7) in the inner cylinder (5) are evenly distributed in 2 to 6 locations in the circumferential direction of the inner cylinder (5), and the end of the sealing center pipe hole (9) of the inner cylinder (5) is provided with a first annular step groove (18).
6. The coring tool with a rotary splitter assembly according to claim 2, characterized in that, A first gap (19) is provided between the upper bearing cap (11) and the inner wall of the upper connector (1), and a second gap (20) is provided between the lower bearing cap (13) and the inner cylinder (5). The first gap (19) communicates with the interior of the upper connector (1), and the second gap (20) communicates with the annular flow channel (6).
7. The coring tool with a rotary splitter assembly according to claim 4, characterized in that, The upper bearing cap (11) is threaded to the inner cylinder (5), and the lower bearing cap (13) is threaded to the upper connector (1).
8. The coring tool with a rotary splitter assembly according to claim 2, characterized in that, The upper connector (1) is provided with a second annular step groove (21), and the end of the bearing upper tightening cap (11) is adapted to the second annular step groove (21) and placed in the second annular step groove (21).