Elastic clamping mechanism for freezing coring drilling tool

Abstract

The utility model provides an elastic clamping mechanism for a freezing coring drilling tool, which relates to the technical field of freezing coring equipment, is used for enabling an inner pipe assembly to be detachably connected with a drilling pipe, and comprises a first connecting seat and a second connecting seat which are vertically arranged at an interval, the first connecting seat is sleeved on a connecting pipe, and a fishing spearhead is arranged at the upper end of the connecting pipe. The lower end of the connecting pipe is connected with the second connecting seat; a plurality of bolts are arranged on the first connecting seat in an annular array mode, a plurality of pin seats are arranged in the drill pipe in an annular array mode, inserting grooves are formed in the lower ends of the pin seats, and movable grooves allowing the bolts to move up and down are formed between the adjacent pin seats. A through groove is formed in the second connecting base, a limiting block is arranged at the lower end of the connecting pipe, the second connecting base is coaxially and slidably connected with the connecting pipe, and the limiting block is arranged in the through groove. A spring is further included and arranged on the connecting pipe in a sleeving mode, and the two ends of the spring abut against the first connecting base and the second connecting base respectively. The problems that a traditional elastic clamping mechanism is high in maintenance frequency and failure rate, inconvenient to use and the like are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of cryogenic coring equipment, and particularly relates to a spring clip mechanism for a cryogenic coring drill tool. Background Art

[0002] The spring clip mechanism in a drill tool is an important part of a wireline coring drill tool. It is mainly responsible for the positioning and locking functions of the inner tube assembly to ensure the stability and reliability of the inner tube assembly during drilling. The traditional spring clip mechanism mainly consists of a spring clip, a spring clip holder, a conical rod, a spring clip stop, a spring clip chamber, a spring and some accessories. When the inner tube assembly descends in the drill pipe string, the tension spring causes the spring clip plate to open outward at a certain angle and slide downward along the inner wall of the drill pipe. When the inner tube assembly reaches the spring clip chamber in the outer tube assembly, the spring clip plate continues to open outward under the action of the tension spring, and the two wings are attached to the inner wall of the spring clip chamber. Since the inner diameter of the spring clip chamber is larger and the inner diameter of the spring clip stop at its upper end is smaller, the upward movement of the inner tube assembly can be prevented during drilling to achieve the positioning effect. When the fishing tool catches the fishing head with the fishing hook and lifts it upward, the recovery pipe is driven to move upward. The upward movement of the recovery pipe forces the spring clip to close and break away from the restriction of the spring clip stop, so that the inner tube assembly can be smoothly lifted up. The traditional spring clip mechanism has a relatively complex structure, resulting in relatively high maintenance frequency and failure rate, and it is not very convenient to use. Especially when lifting the inner tube assembly, it needs to rely on the cooperation of the recovery pipe. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a spring clip mechanism for a cryogenic coring drill tool, which solves the problems of relatively high maintenance frequency and failure rate of the traditional spring clip mechanism and is not very convenient to use.

[0004] The utility model is realized by the following technical solutions: A spring clip mechanism for a cryogenic coring drill tool is arranged in a drill pipe and is used for detachably connecting an inner tube assembly with the drill pipe. It includes a first connecting seat and a second connecting seat which are arranged at intervals up and down. The first connecting seat is sleeved on a connecting pipe. A fishing head is arranged at the upper end of the connecting pipe, and the lower end of the connecting pipe is connected with the second connecting seat.

[0005] A plurality of pins are arranged in a circular array on the first connecting seat. A plurality of pin seats are arranged in a circular array in the drill pipe. A slot is arranged at the lower end of the pin seat, and an activity slot for the up and down movement of the pin is arranged between adjacent pin seats.

[0006] Further, a slope is arranged at the upper end of the pin, and the slot is fitted with the pin.

[0007] Further, a suspension support is arranged in the drill pipe. A suspension ring is arranged on the second connecting seat, and the suspension ring is placed on the suspension support.

[0008] Further, a through groove is radially and penetratingly provided on the second connecting seat. A limiting block is provided at the lower end of the connecting pipe. The second connecting seat is slidably connected to the connecting pipe coaxially, and the limiting block is placed in the through groove.

[0009] Further, a spring is further included. The spring is sleeved on the connecting pipe, and the two ends of the spring are respectively abutted against the first connecting seat and the second connecting seat.

[0010] Further, a liquid inlet is radially provided on the part of the connecting pipe above the first connecting seat, and a liquid outlet is radially provided on the part of the lower end of the connecting pipe in the through groove.

[0011] Further, a centralizer is further provided in the drill pipe, and the centralizer is slidably abutted against the second connecting seat.

[0012] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0013] When lowering the inner pipe assembly, after the hanging ring abuts against the hanging support, continue to press down the fishing spearhead, drive the first connecting seat to move downward and compress the spring, then slightly rotate the first connecting seat, so that several pins are respectively initially aligned with several slots. Subsequently, cancel the downward pressure on the first connecting seat. Under the action of the spring, several pins respectively enter into several slots, and are automatically corrected through the inclined surfaces on the pins, so as to realize the engagement of the pins and the slots. Subsequently, the drill pipe acts on the pins through the slots, and then acts on the bottom of the through groove on the second connecting seat through the connecting pipe on the first connecting seat and the limiting block at its lower end, so as to apply a downward force to the inner pipe assembly; when it is necessary to lift the inner pipe assembly, it is also only necessary to slightly lift the drill pipe, then press down the first connecting seat to compress the spring, then slightly rotate the first connecting seat to make several pins respectively initially aligned with several movable slots, and then cooperate with the fishing tool and the fishing spearhead to lift the inner pipe assembly. This mechanism has a simple structure, low failure rate and is simple and convenient to use. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 It is a cross-sectional structural schematic diagram of a spring clip mechanism for a freeze coring drill provided by the present invention;

[0016] Figure 2Schematic cross-sectional structure diagram of a drill pipe in an elastic clamping mechanism for a freezing coring drill provided by the present utility model;

[0017] Icon: 1. Drill pipe, 2. First connection seat, 21. Pin, 22. Inclined surface, 3. Second connection seat, 31. Through slot, 4. Connecting pipe, 41. Limit block, 42. Liquid inlet, 43. Liquid outlet, 5. Fishing spearhead, 6. Pin seat, 61. Slot, 62. Movable slot, 7. Suspension support, 8. Suspension ring, 9. Spring, 10. Centralizer. Specific implementation mode

[0018] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0020] Refer to Figures 1 to 2 As shown, this embodiment provides an elastic clamping mechanism for a freezing coring drill, which is arranged in the drill pipe 1 and is used for detachably connecting the inner pipe assembly and the drill pipe 1. It includes a first connection seat 2 and a second connection seat 3 arranged at intervals up and down. The first connection seat 2 is sleeved on the connecting pipe 4. A fishing spearhead 5 is arranged at the upper end of the connecting pipe 4. The fishing spearhead 5 is mainly used in cooperation with a fishing hook for placing and fishing the inner pipe assembly. The lower end of the connecting pipe 4 is connected to the second connection seat 3.

[0021] As Figure 1 and 2 shown, a plurality of pins 21 are arranged in a circular array on the first connection seat 2, a plurality of pin seats 6 are arranged in a circular array in the drill pipe 1, a slot 61 is arranged at the lower end of the pin seat 6, and a movable slot 62 for the pins 21 to move up and down is arranged between adjacent pin seats 6. During specific implementation, the inner pipe assembly is lowered, so that a plurality of pins 21 on the first connection seat 2 respectively move from a plurality of movable slots 62 to below the pin seats 6, and then the inner pipe assembly is rotated to align a plurality of pins 21 with a plurality of slots 61, so as to provide support for the inner pipe assembly through the cooperation of the slots 61 and the pins 21 during drilling.

[0022] More specifically, as Figure 1 and 2As shown in the figure, a bevel 22 is provided at the upper end of the bolt 21. The slot 61 is engaged with the bolt 21. The bevel 22 on the bolt 21 helps the bolt 21 to align with the slot 61, so that the bolt 21 and the slot 61 are completely engaged, and the slot 61 provides stable support for the bolt 21.

[0023] During specific implementation, as Figure 1 shown in the figure, a suspension support 7 is provided inside the drill pipe 1, a suspension ring 8 is provided on the second connection seat 3, and the suspension ring 8 is placed on the suspension support 7. When lowering the inner pipe assembly, after several bolts 21 pass through several movable slots 62, the suspension ring 8 abuts against the suspension support 7, thus preventing the inner pipe assembly from continuing to fall and preliminarily limiting the inner pipe assembly.

[0024] A through slot 31 is provided through the second connection seat 3 in the radial direction. A limit block 41 is provided at the lower end of the connecting pipe 4. The second connection seat 3 and the connecting pipe 4 are slidably connected coaxially, and the limit block 41 is placed in the through slot 31; a spring 9 is also included, and the spring 9 is sleeved on the connecting pipe 4, and both ends of the spring 9 abut against the first connection seat 2 and the second connection seat 3 respectively.

[0025] During specific implementation, as Figure 1 and 2 shown in the figure, in the natural state, the first connection seat 2 moves upward under the action of the spring 9, so that the limit block 41 at the lower end of the connecting pipe 4 abuts against the top of the through slot 31. When lowering the inner pipe assembly, after the suspension ring 8 abuts against the suspension support 7, continue to press down the fishing spear head 5, drive the first connection seat 2 to move downward and compress the spring 9, then slightly rotate the first connection seat 2, so that several bolts 21 are respectively preliminarily aligned with several slots 61. Subsequently, cancel the downward pressure on the first connection seat 2. Under the action of the spring 9, several bolts 21 respectively enter several slots 61, and are automatically corrected through the bevel 22 on the bolt 21, so as to realize the engagement of the bolt 21 and the slot 61. Subsequently, the drill pipe 1 acts on the bolt 21 through the slot 61, and then acts on the bottom of the through slot 31 on the second connection seat 3 through the connecting pipe 4 at the first connection seat 2 and the limit block 41 at its lower end, so as to apply a downward acting force on the inner pipe assembly.

[0026] When it is necessary to lift the inner pipe assembly, it is also only necessary to slightly lift the drill pipe, then press down the first connection seat 2 to compress the spring 9, then slightly rotate the first connection seat 2 to make several bolts 21 respectively preliminarily aligned with several movable slots 62, and then use the fishing tool to cooperate with the fishing spear head to lift the inner pipe assembly. The structure of this mechanism is simple, the failure rate is low, and it is simple and convenient to use.

[0027] More specifically, as Figure 1As shown, a liquid inlet 42 is provided radially at the upper end of the connecting pipe 4 located at the first connecting seat 2, and a liquid outlet 43 is provided radially at a part of the lower end of the connecting pipe 4 located in the through groove 31. The connecting pipe 4 is mainly used for supplying drilling fluid during drilling, so that the drilling fluid can smoothly pass through the cartridge mechanism.

[0028] Meanwhile, as Figure 1 and 2 shown, a centralizer 10 is further provided in the drill pipe 1. The centralizer 10 is in sliding abutment with the second connecting seat 3, thereby coaxializing the entire cartridge mechanism and even the inner pipe assembly with the drill pipe 1, and at the same time ensuring that the insertion pin 21 and the insertion slot 61 can be tightly fitted.

[0029] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A snap-in mechanism for a cryocoring drill, arranged in a drill pipe (1) and used to detachably connect an inner pipe assembly to the drill pipe (1), characterized in that: It comprises a first connecting seat (2) and a second connecting seat (3) which are arranged at an interval up and down, the first connecting seat (2) is sleeved on a connecting pipe (4), a spearhead (5) is arranged at the upper end of the connecting pipe (4), and the lower end of the connecting pipe (4) is connected to the second connecting seat (3); A plurality of latch pins (21) are arranged in a circular array on the first connecting seat (2), a plurality of pin seats (6) are arranged in a circular array inside the drill pipe (1), a slot (61) is arranged at the lower end of the pin seat (6), and a movable groove (62) for the latch pins (21) to move up and down is arranged between adjacent pin seats (6).

2. The spring-clamp mechanism for a cryocoring drill according to claim 1, characterized in that: The upper end of the latch pin (21) is provided with an inclined surface (22), and the slot (61) is engaged with the latch pin (21).

3. The spring-clamp mechanism for a cryocoring drill according to claim 1, characterized in that: A suspension support (7) is arranged inside the drill pipe (1), a suspension ring (8) is arranged on the second connecting seat (3), and the suspension ring (8) is placed on the suspension support (7).

4. A snap-in mechanism for a cryocoring drill according to any one of claims 1 to 3, characterized in that: A through groove (31) is radially penetrated on the second connection seat (3), a limit block (41) is provided at the lower end of the connection pipe (4), the second connection seat (3) and the connection pipe (4) are coaxially slidably connected, and the limit block (41) is placed in the through groove (31).

5. The spring-clamp mechanism for a cryocoring drill according to claim 4, characterized in that: It also comprises a spring (9), wherein the spring (9) is sleeved on the connecting pipe (4), and the two ends of the spring (9) are respectively in contact with the first connecting seat (2) and the second connecting seat (3).

6. The spring-clamp mechanism for a cryocoring drill according to claim 4, characterized in that: The portion of the connecting tube (4) located at the upper end of the first connecting seat (2) is provided with a liquid inlet (42) in the radial direction, and the portion of the lower end of the connecting tube (4) located in the through groove (31) is provided with a liquid outlet (43) in the radial direction.

7. The spring-clamp mechanism for a cryocoring drill according to claim 1, characterized in that: A centralizer (10) is also provided inside the drill pipe (1), and the centralizer (10) is in sliding contact with the second connecting seat (3).

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