CN218439288U

CN218439288U - Simple coring device for soft and broken stratum

Info

Publication number: CN218439288U
Application number: CN202222985806.3U
Authority: CN
Inventors: 孟凡财; 袁红妍; 闫玉杰; 陈洪涛; 李子豪; 逯佳鑫; 张焰
Original assignee: Daqing Damei Petroleum Equipment Manufacturing Co ltd
Current assignee: Daqing Damei Petroleum Equipment Manufacturing Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-02-03
Anticipated expiration: 2032-11-09

Abstract

The utility model relates to a simple and easy corer for soft broken stratum. The coring device mainly solves the problem that when the existing coring device for the soft and broken stratum grabs the core rock, the core may be leaked to cause the failure of coring. The drill string is characterized in that a plurality of chuck grooves (6) are formed in the side wall of the drill string (1), a rotating shaft (2) is arranged in each chuck groove (6), a chuck (3) is connected to the rotating shaft (2), a torsion spring is arranged on the rotating shaft (2), and the chuck (3) turns to the inside of the drill string (1) in a free state. This a simple and easy corer for soft broken stratum snatchs the core more stable, can avoid the core leakage and the core that causes to get the core failure.

Description

Simple coring device for soft and broken stratum

Technical Field

A simple coring device for soft and broken stratums.

Background

In units such as petroleum geology, coal, ground and mines, in the underground geological core collection process, along with the continuous deep advance of resource exploitation at home and abroad, the difficulty of exploitation also gradually increases, and for better understanding of the geological conditions of the exploited area, the geology, the landform and the like of the exploited area need to be investigated by acquiring the core. In the existing coring device for soft and broken stratums, a mechanism for grabbing a core is conical and self-locking, and when the core meets broken stratums such as a mud stratum, the core can leak down to cause coring failure.

Disclosure of Invention

In order to overcome current coring device that is used for soft broken stratum when snatching the core rock, the core probably leaks and causes to get the not enough of core failure, the utility model provides a simple and easy corer for soft broken stratum, this simple and easy corer for soft broken stratum snatchs the core more stably, can avoid the core to leak and the core failure that gets that causes.

The technical scheme of the utility model is that: the utility model provides a simple and easy corer for soft broken stratum, includes the drilling string, it has a plurality of dop groove to open on the drilling string lateral wall, and the dop inslot is equipped with the pivot, is connected with the dop in the pivot, be equipped with torsion spring in the pivot, torsion spring dop turn to the drilling string inside under free state.

The outer side of the upper part of the chuck groove is provided with a retaining wall, the rotating shaft is positioned at the lower part of the chuck groove, the chuck upwards rotates under the thrust of a rock core below the chuck, and the front end of the chuck is positioned inside the retaining wall.

The outer side of the chuck is a straight surface, the inner side of the chuck is an inclined surface which inclines upwards, and the included angle between the front end surface and the inner side surface is larger than 90 degrees.

The distance between the rotating shaft and the bottom surface of the chuck groove is less than the length of the chuck.

The chuck grooves are 6 and are uniformly distributed along the circumferential direction.

The drill bit is connected to the bottom of the drill string.

The utility model discloses following beneficial effect has: by adopting the scheme, the core taking device is mainly suitable for soft and broken stratums, when the core is taken, the core enters the inner cylinder of the drill column to move upwards, and the chuck is turned upwards to not block the core from entering; when the drilling tool is lifted upwards, the rock core moves downwards relatively, the clamping head clamps the rock core and cuts off the rock core, the rock core is arranged in the inner barrel of the drill column, the rock core cannot fall downwards due to the blocking of the clamping head, the core taking failure caused by the leakage of the rock core is avoided, the core taking work is more stable, and the core taking efficiency is improved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure 1-drill string, 2-spindle, 3-chuck, 4-core, 5-bit, 6-chuck groove, 7-retaining wall.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in figure 1, the simple coring device for soft and broken ground comprises a drill string 1, wherein a drill bit 5 is connected to the bottom of the drill string 1. The drill string is characterized in that the side wall of the drill string 1 is provided with a plurality of chuck grooves 6, each chuck groove 6 is internally provided with a rotating shaft 2 in the horizontal direction, each rotating shaft 2 is connected with a chuck 3, each rotating shaft 2 is provided with a torsion spring, each chuck 3 turns to the inside of the drill string 1 in a free state, and each chuck 3 can be upwards turned under the upward pushing of the lower rock core 4.

6 chuck grooves 6 are evenly distributed along the circumferential direction. The lower part of the chuck groove 6 is a through groove, the outer side of the upper part is provided with a blocking wall 7, the rotating shaft 2 is positioned at the through groove at the lower part of the chuck groove 6, and when the chuck 3 rotates upwards under the thrust of the rock core 4 below, the blocking wall 7 can block the front end of the chuck 3 to prevent the chuck 3 from turning out of the chuck groove 6. The distance between the rotating shaft 2 and the bottom surface of the chuck groove 6 is smaller than the length of the chuck 3, so that the chuck 3 stops rotating downwards to a certain degree, a central channel cannot be completely emptied, and a core on the upper part of the chuck 3 can be prevented from falling downwards. The outside of dop 3 is the straight face, and the inboard inclined plane that is the tilt up, and the contained angle of preceding terminal surface and medial surface is greater than 90 degrees, and this kind of structure can make things convenient for core 4 to be upwards removed by 3 lower parts of dop. Meanwhile, the outer side surface of the chuck 3 and the front end surface form an acute angle, so that the rock core 4 is conveniently cut.

The core taker is mainly suitable for grabbing cores of soft and broken strata, when a drill bit 5 drills downwards, a core 4 enters a drill string 1 along the center of the drill bit 5, a chuck 3 is turned upwards to not block the core from entering, and the core 4 continues to move upwards along the interior of the drill string 1 along with the drilling of the drill bit 5; after the drilling is finished, the drill string 1 is lifted up, the rock core 4 moves downwards relative to the drill string 1, the chuck 3 is driven to turn inwards and downwards, the rock core 4 is clamped and cut off, and the rock core 4 is arranged in an inner cylinder of the drill string; and (3) continuing to lift the drill string 1, wherein the core 4 at the upper part cannot fall off under the blocking of the chuck 3, and is brought to the ground by the drill string 1 and the chuck, so that coring is completed. The core extractor can stably grab the soft and broken stratum core, avoids the core taking failure caused by the core leakage, and improves the core taking efficiency.

Claims

1. A simple corer for soft fractured formations comprising a drill string (1), characterized in that: the drill string is characterized in that a plurality of chuck grooves (6) are formed in the side wall of the drill string (1), a rotating shaft (2) is arranged in each chuck groove (6), a chuck (3) is connected to the rotating shaft (2), a torsion spring is arranged on the rotating shaft (2), and the chuck (3) turns to the inside of the drill string (1) in a free state.

2. The simple corer for soft fractured formations of claim 1 wherein: the outer side of the upper portion of the chuck groove (6) is provided with a blocking wall (7), the rotating shaft (2) is located on the lower portion of the chuck groove (6), the chuck (3) rotates upwards under the thrust of the rock core (4) below, and the front end of the chuck (3) is located inside the blocking wall (7).

3. The simplified coring apparatus for loosening and fracturing earth formations as set forth in claim 2, wherein: the outer side of the chuck (3) is a straight surface, the inner side of the chuck is an inclined surface which inclines upwards, and the included angle between the front end surface and the inner side surface is larger than 90 degrees.

4. The simple corer for soft fractured formations of claim 3 wherein: the distance between the rotating shaft (2) and the bottom surface of the clamping head groove (6) is smaller than the length of the clamping head (3).

5. The simple corer for soft fractured formations of claim 4 wherein: the number of the chuck grooves (6) is 6, and the chuck grooves are uniformly distributed along the circumferential direction.

6. The simple corer for soft fractured formations as recited in claim 5, wherein: the bottom of the drill stem (1) is connected with a drill bit (5).