CN215927304U

CN215927304U - Coring tool for preventing blockage and breaking stratum

Info

Publication number: CN215927304U
Application number: CN202122461712.1U
Authority: CN
Inventors: 杨莉; 刘伟; 周峰
Original assignee: Chengdu Dingyuan Petroleum Engineering Technology Service Co ltd
Current assignee: Chengdu Dingyuan Petroleum Engineering Technology Service Co ltd
Priority date: 2021-10-12
Filing date: 2021-10-12
Publication date: 2022-03-01
Anticipated expiration: 2031-10-12

Abstract

The utility model provides a coring tool for preventing a core blockage from breaking a stratum, which comprises an outer barrel component, wherein a rotating assembly is arranged in the outer barrel component; the core-pulling mechanism comprises an inner cylinder, a core claw assembly, a rotating assembly and a push rod assembly, wherein one end of the inner cylinder is connected to the rotating assembly, the other end of the inner cylinder is provided with the core claw assembly, an outer bushing is embedded in the inner cylinder and connected with the core claw assembly through an outer pin, the rotating assembly at least comprises a spindle sleeve which is rotatably connected with the outer cylinder assembly, a ball plug and the push rod assembly are embedded in the spindle sleeve, and the push rod assembly is distributed between the spindle sleeve and the outer bushing; the side wall of the mandrel sleeve is provided with an oblique shunting hole; the push rod component comprises a rod body, one end of the rod body, which is embedded into the spindle sleeve, is provided with a front push disc, the other end of the rod body is provided with a rear push disc, and a spring is sleeved outside the rod body and distributed between the spindle sleeve and the rear push disc; the ball block is distributed between the oblique shunting hole and the forward pushing disc. The utility model can help the staff to accurately judge the coring finishing time, can prevent the coring and is beneficial to improving the working efficiency.

Description

Coring tool for preventing blockage and breaking stratum

Technical Field

The utility model relates to the technical field of petroleum and natural gas core drilling equipment, in particular to a coring tool for a blockage-preventing and crushing stratum.

Background

In the oil and gas drilling industry, in order to detect oil and gas data in an area, a core in the area is generally taken as a sample to perform correlation analysis, so as to judge whether oil and gas drilling is performed in the area. During coring, the industry often uses special coring tools to drill the core. The conventional coring tool mainly comprises an outer barrel, an inner barrel and a coring bit, and the working principle is that under the driving of a drilling tool, the outer barrel and the coring bit rotate and extend into a rock stratum, a rock core drilled by the coring bit is stored in the inner barrel in the process, the coring tool is drawn out after the drilling is finished, and the rock core is taken out from the inner barrel. But the structure of the rock stratum of the broken stratum is unstable, so that the blockage is easy to occur in the process of storing the rock core into the inner barrel, and the defects of low precision and poor sensitivity are caused when the coring is judged whether to be finished or not by only depending on the way that the coring tool stretches into the stratum for a length.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide a coring-prevention stratum-crushing coring tool which can help workers accurately judge the coring finishing time, can prevent coring and is beneficial to improving the working efficiency.

The embodiment of the utility model is realized by the following technical scheme:

a coring tool for preventing a blockage from crushing a stratum comprises an outer barrel assembly, wherein one end of the outer barrel assembly is connected to a drilling tool, and a coring bit is arranged at the other end of the outer barrel assembly; a rotating assembly is arranged in the outer cylinder component; the core taking device comprises a rotary assembly, a core taking drill bit and a core barrel, and is characterized by further comprising an inner barrel, wherein the inner barrel is distributed between the rotary assembly and the core taking drill bit, one end of the inner barrel is connected to the rotary assembly, a core claw assembly is configured at the other end of the inner barrel, an outer bushing is embedded in the inner barrel and connected with the core claw assembly through an outer pin, the rotary assembly at least comprises a spindle sleeve which is rotatably connected with the outer barrel assembly, a ball plug and a push rod assembly are embedded in the spindle sleeve, and the push rod assembly is distributed between the spindle sleeve and the outer bushing; an oblique shunting hole is formed in the side wall of the mandrel sleeve; the push rod assembly comprises a rod body, one end of the rod body, which is embedded into the spindle sleeve, is provided with a front push disc, the other end of the rod body is provided with a rear push disc, and a spring is sleeved outside the rod body and distributed between the spindle sleeve and the rear push disc; the ball plug is distributed between the oblique shunting hole and the forward pushing disc.

According to a preferred embodiment, a first annular groove is formed in the end face, close to the outer bushing, of the spindle sleeve, and the first annular groove is communicated with an inner cavity of the spindle sleeve; a check ring is arranged in the first annular groove, the inner diameter of the check ring is smaller than that of the mandrel sleeve, and the inner diameter of the check ring is larger than the outer diameter of the forward pushing disc.

According to a preferred embodiment, an inner bushing is embedded in the outer bushing and connected with the core gripper assembly through an inner pin; the diameter of the outer pin is greater than the diameter of the inner pin.

According to a preferred embodiment, a flow passage is arranged in the rod body and simultaneously penetrates through the front push disc and the rear push disc; the diameter of the ball plug is larger than that of the flow passage.

According to a preferred embodiment, the core gripper assembly comprises a connecting sleeve and a core gripper seat which are connected with each other, the connecting sleeve is connected to the inner cylinder, the outer bushing is connected with the connecting sleeve through the outer pin, and the inner bushing is connected with the connecting sleeve through the inner pin; one end of the core claw seat, which is close to the coring bit, is provided with ball bearings, and the ball bearings are distributed between the core claw seat and the outer barrel assembly.

According to a preferred embodiment, the outer barrel assembly comprises a plurality of outer barrel nipples connected to one another; and two adjacent outer cylinder short sections are connected through a difference short section.

According to a preferred embodiment, a safety joint is arranged between the outer barrel assembly and the drilling tool; the rotating assembly further comprises a bearing box, the bearing box is sleeved outside the spindle sleeve and distributed far away from the spring, and the bearing box is fixedly connected with the safety joint; the inner wall of the bearing box is provided with a second annular groove, the outer wall of the mandrel sleeve is provided with a third annular groove matched with the second annular groove, and the second annular groove and the third annular groove form a rotating cavity for embedding a thrust bearing; the mandrel sleeve is rotatably connected with the bearing box through the thrust bearing.

According to a preferred embodiment, the outer diameter of the thrust disk is greater than the inner diameter of the outer bushing.

The technical scheme of the embodiment of the utility model at least has the following advantages and beneficial effects:

the outer barrel assembly drives the coring bit to rotate under the driving of the drilling tool to drill the core, the core enters the outer bushing through the core gripper assembly, when the outer bushing is blocked, drilling is continued, the outer pin is sheared at the moment, the blockage is relieved, the subsequently entered core is accommodated in the inner barrel and pushes the outer bushing to move upwards along the axial direction of the inner barrel until the outer bushing abuts against the rear push disc, the rear push disc compresses the spring and enables the front push disc to push the ball plug to move in the mandrel sleeve to the oblique shunting hole, the blocking of the ball plug causes the reduction of the flow area at the oblique shunting hole, meanwhile, the pressure of drilling fluid in the coring tool is increased, and a worker can judge that coring is finished, so that the sensitivity is high, and the working efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a rotary assembly according to the present invention;

fig. 3 is a schematic structural view of the push rod assembly of the present invention.

Icon: 1-safety joint, 2-rotating assembly, 21-baffle ring, 22-thrust bearing, 23-bearing box, 24-oblique diversion hole, 25-mandrel sleeve, 26-ball plug, 27-retainer ring, 28-push rod component, 281-rod body, 282-flow channel, 283-back push disk, 284-front push disk, 29-spring, 3-difference short section, 4-outer-barrel short section, 5-inner barrel, 6-outer bushing, 7-inner bushing, 8-outer pin, 9-core claw seat, 10-roller bearing, 11-coring bit, 12-inner pin and 13-connecting sleeve.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the products of the present invention are used, it is only for convenience of describing the present invention and simplifying the description, but it is not intended to indicate or imply that the device or element which is referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 3, an anti-clogging and anti-crushing formation coring tool comprises an outer cylinder assembly, one end of which is connected to a drilling tool and the other end of which is provided with a coring bit 11; a rotating assembly 2 is arranged in the outer cylinder component; the core taking drill bit is characterized by further comprising an inner barrel 5, the inner barrel 5 is distributed between the rotating assembly 2 and the core taking drill bit 11, one end of the inner barrel 5 is connected to the rotating assembly 2, the other end of the inner barrel is provided with a core claw assembly, an outer bushing 6 is embedded in the inner barrel 5, the outer bushing 6 is connected with the core claw assembly through an outer pin 8, the rotating assembly 2 at least comprises a spindle sleeve 25 which is rotatably connected with the outer barrel assembly, a ball plug 26 and a push rod assembly 28 are embedded in the spindle sleeve 25, and the push rod assembly 28 is distributed between the spindle sleeve 25 and the outer bushing 6; the side wall of the mandrel sleeve 25 is provided with an oblique shunting hole 24. The push rod assembly 28 includes a rod 281, one end of the rod 281 embedded in the spindle sleeve 25 is configured with a front push disc 284, the other end is configured with a rear push disc 283, the rod 281 is sleeved with a spring 29, and the spring 29 is distributed between the spindle sleeve 25 and the rear push disc 283; the ball plugs 26 are distributed between the oblique diversion holes 24 and the forward thrust disk 284. As shown in fig. 1 and 2, when the core drilling machine is used, the outer cylinder assembly drives the coring bit 11 to rotate under the driving of the drilling tool to drill a core, the core enters the outer bushing 6 through the core gripper assembly, when the outer bushing 6 is blocked, drilling is continued, the outer pin 8 is cut off at the moment, the blocking is removed, the subsequently entered core is accommodated in the inner cylinder 5, the outer bushing 6 is pushed to move upwards along the axial direction of the inner cylinder 5 until the outer bushing 6 abuts against the rear push disc 283, at the moment, the rear push disc 283 compresses the spring 29 and enables the front push disc 284 to push the ball plug 26 to move in the mandrel sleeve 25 to the inclined diversion hole 24, the blocking of the ball plug 26 reduces the flow area at the inclined diversion hole 24, meanwhile, the pressure of drilling fluid in the coring tool is increased, a worker can judge that coring is finished, the sensitivity is high, and the core drilling machine is favorable for improving the working efficiency. It should be noted that when the core is not blocked in the outer liner 6, the core moves up to the rear push tray 283 along the inner cavity of the outer liner 6, and as drilling continues, the core pushes the rear push tray 283 to compress the spring 29, the front push tray 284 pushes the ball plug 26 to block the inclined diversion hole 24, the drilling fluid pressure in the coring tool rises, and the operator determines that coring is finished according to the situation.

In this embodiment, the outer diameter of the rear push plate 283 is larger than the inner diameter of the outer bushing 6.

Further, as shown in fig. 2 and 3, a first annular groove is formed in an end surface of the spindle sleeve 25 close to the outer bushing 6, and the first annular groove is communicated with an inner cavity of the spindle sleeve 25. A retainer ring 27 is disposed in the first annular groove, the inner diameter of the retainer ring 27 being smaller than the inner diameter of the spindle sleeve 25, and the inner diameter of the retainer ring 27 being larger than the outer diameter of the forward thrust disk 284. In this embodiment, the retainer ring 27 is used to retain the forward pushing disk 284 from disengaging from the spindle sleeve 25.

In the embodiment, an inner bushing 7 is embedded in the outer bushing 6, and the inner bushing 7 is connected with the core gripper assembly through an inner pin 12; the diameter of the outer pin 8 is larger than the diameter of the inner pin 12. When the core plugging device is used, a core is firstly contained in the inner bushing 7, and when plugging occurs, the inner pin 12 is firstly sheared, and the plugging is relieved; and (4) continuing drilling, when the rock core is blocked in the outer bushing 6, shearing the outer pin 8, and removing the blocked core again. It should be noted that the number of lining layers here may be set according to actual needs, and is not limited to two layers of the outer lining 6 and the inner lining 7.

In this embodiment, a flow passage 282 is disposed in the rod 281, and the flow passage 282 penetrates through the front push plate 284 and the rear push plate 283; the diameter of the ball plug 26 is larger than the diameter of the flow passage 282. Flow passage 282 is for the flow of drilling fluid.

As shown in fig. 1, the core gripper assembly includes a connecting sleeve 13 and a core gripper seat 9 connected to each other, the connecting sleeve 13 is connected to the inner cylinder 5, the outer liner 6 is connected to the connecting sleeve 13 by the outer pin 8, and the inner liner 7 is connected to the connecting sleeve 13 by the inner pin 12; one end of the core claw seat 9 close to the coring bit 11 is provided with ball bearings which are distributed between the core claw seat 9 and the outer cylinder assembly. The ball bearing is used for righting the inner barrel 5, and is beneficial to coring operation in a horizontal well section.

In this embodiment, the outer barrel assembly comprises a plurality of outer barrel nipples 4 connected to one another; two adjacent outer cylinder short joints 4 are connected through a difference short joint 3. The differential nipple 3 plays a stabilizing role, and is beneficial to stable drilling of the coring tool.

In the embodiment, as shown in fig. 1 and 2, a safety joint 1 is arranged between the outer cylinder component and the drilling tool; the rotating assembly 2 further comprises a bearing box 23, the bearing box 23 is sleeved outside the mandrel sleeve 25 and distributed away from the spring 29, and the bearing box 23 is fixedly connected with the safety joint 1; the inner wall of the bearing box 23 is provided with a second annular groove, the outer wall of the mandrel sleeve 25 is provided with a third annular groove matched with the second annular groove, and the second annular groove and the third annular groove form a rotating cavity for embedding the thrust bearing 22; the spindle sleeve 25 is rotatably connected to the bearing housing 23 via the thrust bearing 22. Further, the spindle sleeve 25 is provided with a retainer ring 21 for limiting the thrust bearing 22.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-clogging broken stratum coring tool comprises an outer barrel assembly, wherein one end of the outer barrel assembly is connected to a drilling tool, and the other end of the outer barrel assembly is provided with a coring bit (11); a rotating assembly (2) is arranged in the outer cylinder component; still include inner tube (5), this inner tube (5) distribute in rotatory assembly (2) with between coring bit (11), the one end of inner tube (5) is connected to rotatory assembly (2), its other end disposes the rock core claw subassembly, inner tube (5) are embedded to be equipped with outer liner (6), and outer liner (6) are connected its characterized in that through outer pin (8) and rock core claw subassembly:

the rotating assembly (2) at least comprises a spindle sleeve (25) which is rotatably connected with the outer barrel component, a ball plug (26) and a push rod component (28) are embedded in the spindle sleeve (25), and the push rod component (28) is distributed between the spindle sleeve (25) and the outer bushing (6); an oblique shunting hole (24) is formed in the side wall of the spindle sleeve (25);

the push rod assembly (28) comprises a rod body (281), one end of the rod body (281) embedded in the spindle sleeve (25) is provided with a front push disc (284), the other end of the rod body is provided with a rear push disc (283), a spring (29) is sleeved outside the rod body (281), and the spring (29) is distributed between the spindle sleeve (25) and the rear push disc (283); the ball plugs (26) are distributed between the inclined diversion holes (24) and the forward pushing disc (284).

2. The anti-coring fracture formation coring tool of claim 1, wherein: a first annular groove is formed in the end face, close to the outer bushing (6), of the spindle sleeve (25), and the first annular groove is communicated with an inner cavity of the spindle sleeve (25);

a retainer ring (27) is arranged in the first annular groove, the inner diameter of the retainer ring (27) is smaller than that of the mandrel sleeve (25), and the inner diameter of the retainer ring (27) is larger than the outer diameter of the forward pushing disc (284).

3. The tool of claim 1 or 2, wherein: an inner bushing (7) is embedded in the outer bushing (6), and the inner bushing (7) is connected with the core gripper assembly through an inner pin (12);

the diameter of the outer pin (8) is larger than the diameter of the inner pin (12).

4. The anti-coring fracture formation coring tool of claim 1, wherein: a flow passage (282) is arranged in the rod body (281), and the flow passage (282) simultaneously penetrates through the front push disc (284) and the rear push disc (283);

the diameter of the ball plug (26) is larger than the diameter of the flow passage (282).

5. The anti-coring fracture formation coring tool of claim 3, wherein: the core claw assembly comprises a connecting sleeve (13) and a core claw seat (9) which are connected with each other, the connecting sleeve (13) is connected to the inner cylinder (5), the outer bushing (6) is connected with the connecting sleeve (13) through the outer pin (8), and the inner bushing (7) is connected with the connecting sleeve (13) through the inner pin (12);

one end, close to the coring bit (11), of the core claw seat (9) is provided with a ball bearing, and the ball bearing is distributed between the core claw seat (9) and the outer cylinder assembly.

6. The anti-coring fracture formation coring tool of claim 1, wherein: the outer barrel assembly comprises a plurality of outer barrel nipples (4) connected to each other;

and two adjacent outer cylinder short joints (4) are connected through a difference short joint (3).

7. The anti-coring fracture formation coring tool of claim 1, wherein: a safety joint (1) is arranged between the outer barrel assembly and the drilling tool;

the rotating assembly (2) further comprises a bearing box (23), the bearing box (23) is sleeved outside the spindle sleeve (25) and distributed far away from the spring (29), and the bearing box (23) is fixedly connected with the safety joint (1);

a second annular groove is formed in the inner wall of the bearing box (23), a third annular groove matched with the second annular groove is formed in the outer wall of the mandrel sleeve (25), and the second annular groove and the third annular groove form a rotating cavity for embedding the thrust bearing (22);

the mandrel sleeve (25) is rotatably connected with the bearing box (23) through the thrust bearing (22).

8. The anti-coring fracture formation coring tool of claim 1, wherein: the outer diameter of the rear push disc (283) is larger than the inner diameter of the outer bushing (6).