CN211524741U - Middle-long barrel core-taking expansion piece - Google Patents

Abstract

The utility model relates to a medium and long barrel core-taking expansion piece. The problem that the core claw is damaged and the core harvesting rate is influenced by repeated core cutting when the existing medium and long cylinder is used for coring is mainly solved. The method is characterized in that: the upper end of the spline joint (1) is provided with female threads, the middle of the spline joint is externally provided with a spline, the lower end of the spline is provided with a guide tip, and the spline sleeve (2) is arranged outside the spline of the spline joint (1); the lower end of the spline joint (1) is connected with an inner pipe (4); a spline is arranged in the spline sleeve (2), and a guide tip is arranged at the upper end of the spline; the lower part of the spline housing (2) is in threaded connection with an outer pipe (5); a cylindrical baffle ring (3) is arranged in the spline housing (2), and the upper end and the lower end of the baffle ring (3) are respectively limited by a spline on the spline housing and the end surface of the outer pipe thread; the lower part of the inner pipe (4) is in threaded connection with a sealing piston (6); the lower part of the outer pipe (5) is in threaded connection with a lower joint (7). This well long tube core taking expansion bend can guarantee to need not many times to cut the heart when connecing single, can avoid the destruction to the rock core claw.

Description

Middle-long barrel core-taking expansion piece

Technical Field

The utility model relates to an oil field drilling engineering technical field, in particular to long and medium section of thick bamboo core expansion bend.

Background

Medium and long barrel coring refers to coring with a single coring length of 2 single or more, and is generally only applied to the conditions of good formation rock drillability and cementation. Medium barrel coring can also be used on top drive equipped rigs that add a drill in the form of a column (3 singles) without lifting the core up to sever it. When a drilling machine driven by a square drill rod performs long and medium barrel core taking in a hard stratum with poor cementation and drillability, a core needs to be cut once when a single joint is connected every time, and a core claw needs to be contracted and expanded for many times, so that the core claw is easily damaged, and further the core harvesting rate is influenced.

Disclosure of Invention

The utility model aims to solve the technical problem that need cut the heart many times and cause the problem of destruction and influence the rock core rate of harvest to the rock core claw when overcoming the long section of thick bamboo core in the current that exists among the background art, and provide a long section of thick bamboo core expansion bend, this long section of thick bamboo core expansion bend can guarantee to be got the instrument and keep motionless when connecing single, and the drill bit does not leave the shaft bottom, need not to cut the heart many times, can avoid the destruction to the rock core claw.

The utility model provides a its problem accessible reach as follows technical scheme: the middle and long barrel core-taking expansion piece comprises a spline joint, wherein female threads are arranged at the upper end of the spline joint, a spline is arranged outside the middle of the spline joint, a guide tip is arranged at the lower end of the spline, and a spline sleeve is arranged outside the spline of the spline joint; the lower end of the spline joint is connected with an inner pipe; a spline is arranged in the spline sleeve, and a guide tip is arranged at the upper end of the spline; the lower part of the spline housing is in threaded connection with an outer pipe; a cylindrical baffle ring is arranged in the spline housing, and the upper end and the lower end of the baffle ring are respectively limited by a spline on the spline housing and the threaded end surface of the outer tube; the lower part of the inner pipe is in threaded connection with a sealing piston; the lower part of the outer pipe is in threaded connection with a lower joint.

Compared with the above background art, the utility model can have following beneficial effect: according to the middle-long barrel core-taking expansion piece, the spline joint and the spline on the spline housing are provided with the guide tips, so that the drilling tool can be ensured to smoothly transmit torque and bit pressure during core-taking; when a single is connected, the coring tool is ensured to be immobile, and multiple core cutting is not needed, so that the damage of the core claw is avoided. The sealing joint adopts bidirectional sealing, so that the inside and the outside of the drilling tool are ensured to be in a sealing state when the expansion piece works, and the expansion piece is prevented from being punctured.

Drawings

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

FIG. 2 is a schematic structural view of the telescopic device of the present invention when pulled open;

figure 3 is the utility model discloses outside spline housing half-section.

In the figure: 1, spline joint; 2. a spline housing; 3. a baffle ring; 4. an inner tube; 5. an outer tube; 6. a sealing piston; 7. a lower joint; 8. an inner pipe sealing ring; 9. and a Y-shaped sealing ring.

The specific implementation mode is as follows:

the invention will be further explained with reference to the drawings:

as shown in attached figures 1 and 2, the middle-long barrel core-taking expansion piece comprises a spline joint 1, wherein the upper end of the spline joint 1 is provided with female threads and is connected with a drilling tool; the middle outer part is a spline, the lower end of the spline is provided with a guide tip, and the spline sleeve 2 is arranged outside the spline of the spline joint 1; the lower end of the spline joint 1 is a male thread and is connected with the inner pipe 4; as shown in fig. 3, the spline housing 2 is internally provided with a spline, and the upper end of the spline is provided with a guide tip; the lower part of the spline housing 2 is provided with female threads and is connected with the outer tube 5, and a space for accommodating the baffle ring is formed after the spline housing 2 is connected with the outer tube 5; the spline housing 2 is internally provided with a cylindrical baffle ring 3, and the upper end and the lower end of the baffle ring 3 are respectively limited by a spline on the spline housing and the threaded end surface of the outer tube, so that the baffle ring can not move axially. The telescopic device has the functions of limiting the axial movement of the sealing piston when the telescopic device is in an opening state and ensuring that the inner pipe cannot be pulled out; the lower part of the inner tube 4 is connected with a sealing piston 6 through threads; the lower part of the outer pipe 5 is in threaded connection with a lower joint 7, the lower part of the lower joint 7 is male thread, and the lower joint is connected with a coring tool; the outside of the sealing piston is provided with 2 grooves of Y-shaped sealing rings, a Y-shaped sealing ring 9 is arranged between the outer tube 5 and the sealing piston 6, and the sealing piston is matched with the Y-shaped sealing ring to ensure the sealing inside and outside the drilling tool; and inner pipe sealing rings 8 are arranged between the spline joint 1 and the upper end of the inner pipe 4 and between the lower end of the inner pipe 4 and the sealing piston 6, so that the sealing property inside and outside the inner pipe is ensured. The spline joint and the spline on the spline sleeve are provided with guide tips, so that smooth matching of the underground splines can be ensured, and smooth transmission of torque is ensured. The sealing joint adopts bidirectional sealing, so that the inside and the outside of the drilling tool are ensured to be in a sealing state when the expansion piece works, and the expansion piece is prevented from being punctured.

When the medium-long barrel core-taking expansion piece is assembled: a seal ring is arranged on the spline joint and connected with the inner pipe; the spline sleeve and the baffle ring are inserted outside the inner pipe; an O-shaped sealing ring and a Y-shaped sealing ring are arranged on the sealing piston; inserting the outer tube and connecting the spline housing and the outer tube; and finally, connecting the outer pipe with the lower joint threads.

When the middle-long barrel core-taking telescopic device is used, the lower part is connected with a middle-long barrel core-taking tool, and the upper part is connected with a drilling tool. During the drill-down procedure, the jack is in tension, as shown in fig. 2. And after the drill bit contacts the bottom of the well, the drilling tool is continuously lowered, and finally the expansion piece is in a closed state, so that coring can be performed at the moment. During coring, the transmission of the bit pressure and the torque is transmitted from the drilling tool to the spline joint, then transmitted to the spline sleeve, the outer pipe and the lower joint respectively, and finally transmitted to a coring tool and a drill bit. As coring proceeds, the length of the kelly leaking out of the face of the drill is shorter and shorter. When a single joint needs to be connected, stopping the pump by stopping the rotary disc, lifting the drilling tool, and driving the spline joint, the inner pipe and the sealing piston to move upwards by the drilling tool; the spline housing, the outer pipe and the lower joint overcome the friction force of the Y-shaped sealing ring and keep still under the action of the gravity of the centering tool and the spline housing, the outer pipe and the lower joint. After a single bit is connected, the drilling tool is put down, and the expansion piece is closed to continue coring. The single joint can be connected by lifting for multiple times, core claw core cutting is not needed in the single joint connection operation, and damage caused by core claw core cutting for multiple times can be avoided.

Claims (5)

1. The utility model provides a long and medium section of thick bamboo core-taking expansion bend, includes spline joint (1), its characterized in that: the upper end of the spline joint (1) is provided with female threads, the middle of the spline joint is externally provided with a spline, the lower end of the spline is provided with a guide tip, and the spline sleeve (2) is arranged outside the spline of the spline joint (1); the lower end of the spline joint (1) is connected with an inner pipe (4); a spline is arranged in the spline sleeve (2), and a guide tip is arranged at the upper end of the spline; the lower part of the spline housing (2) is in threaded connection with an outer pipe (5); a cylindrical baffle ring (3) is arranged in the spline housing (2), and the upper end and the lower end of the baffle ring (3) are respectively limited by a spline on the spline housing and the end surface of the outer pipe thread; the lower part of the inner pipe (4) is in threaded connection with a sealing piston (6); the lower part of the outer pipe (5) is in threaded connection with a lower joint (7).

2. The long and medium barrel core telescope of claim 1, wherein: the outside of the sealing piston (6) is provided with 2 grooves of Y-shaped sealing rings, and a Y-shaped sealing ring (9) is arranged between the outer tube (5) and the sealing piston (6).

3. The long and medium barrel core telescope of claim 1, wherein: inner pipe sealing rings (8) are arranged between the spline joint (1) and the upper end of the inner pipe (4) and between the lower end of the inner pipe (4) and the sealing piston (6).

4. The long and medium barrel core telescope of claim 1, wherein: the upper end of the spline joint (1) is provided with female threads and is connected with a drilling tool.

5. The long and medium barrel core telescope of claim 1, wherein: the lower part of the lower joint (7) is a male thread and is connected with a coring tool.

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