CN220059488U - Geological coring drilling tool capable of realizing continuous drilling with casing - Google Patents

Abstract

The utility model discloses a geological coring drilling tool capable of realizing continuous drilling with a casing, which belongs to the technical field of exploration drilling tools and comprises a drill rod assembly, a casing assembly and a rock crushing assembly; the drill rod assembly is used for providing rotary torque for a well bottom rock breaking assembly, the casing assembly realizes casing drilling through the action of the reducer union, and the rock breaking assembly can realize extension and retraction of the reaming blocks through the locating rod. In addition, the centralizing bearing can centralize the drill rod and the casing pipe, so that abrasion of the drill rod is prevented. In a comprehensive view, the utility model can effectively realize the drilling with the casing pipe in deep well operation, does not influence the core extracting work of the drill, has simple structure and easy replacement of vulnerable parts, and has high practical value.

Description

A geological coring drilling tool capable of continuous casing drilling

Technical field

The utility model belongs to the technical field of exploration drilling tools, and particularly relates to a geological coring drilling tool that can realize continuous casing drilling.

Background technique

When drilling into broken formations and pebble formations, complex accidents such as block falling, shrinkage or even hole collapse are very easy to occur. Conventional mud wall protection and impact drilling clay wall protection and other methods cannot effectively stabilize the hole wall or a large amount of mud is lost, which is required. Casing drilling technology is used to maintain hole wall stability.

At present, conventional casing drilling technology is mainly divided into two types, one is eccentric casing drilling, and the other is concentric casing drilling. Although the eccentric pipe drilling technology is more efficient, in-hole accidents are prone to occur when the eccentric drill bit fails to retract. When the inner tube of the concentric tube drilling technology is stuck by large cuttings, it will reverse and fail, unable to separate, and its drilling depth is limited. In the pipe-following drilling process, carbide ball teeth are commonly used in combination with down-the-hole hammer drilling. This limits the drilling ability of pipe-following drilling technology into formations, such as hot dry rock formations. In addition to large burial depths and irregular well walls in impact-rotation drilling, In addition, the granite on the well wall is prone to cracking under the action of thermal stress and sudden cooling, and it is very easy for the drill to get stuck. In addition, due to the elasticity of the drill pipe, it appears twisted downhole, which can easily cause friction with the casing and cause damage.

Taken together, the existing casing drilling technology can no longer meet the needs of deep well drilling. Based on this, there is an urgent need for a new drilling tool to solve the shortcomings of the existing technology and improve the application scope of casing drilling technology.

Utility model content

In view of the problems and shortcomings of the existing technology, the purpose of this utility model is to provide a geological coring drill that can realize continuous casing drilling, which is mainly used to meet the technical needs of deep well and casing drilling, and to prevent Friction damage between drill pipe and casing.

The technical solution adopted by this utility model to achieve the above purpose is:

A geological coring drilling tool capable of continuous casing drilling, consisting of a drill pipe assembly, a casing assembly and a broken rock assembly;

Drill pipe components include conventional drill pipe, male joints, female joints, centralizing bearings, special drill pipes, reducing joints, core in-place alarms, drilling fluid channels and baffles;

Conventional drill pipes are welded with male and female joints at both ends respectively. The female joint of each conventional drill pipe is threadedly fastened to the male joint of the adjacent conventional drill pipe or special drill pipe. The centering bearing is set on the annular step of the female joint. , the inner ring of the centering bearing slides with the outer wall of the conventional drill pipe, the outer ring of the centering bearing slides with the inner wall of the casing, the lower end of the special drill pipe is fixedly connected to the reducing joint, and there is a through hole in the middle of the reducing joint for passing the core in place alarm. There is also a circle of drilling fluid channels distributed around the through hole, and the baffle is fixed at the bottom of the core in-place alarm;

The casing assembly includes a casing and a cone head welded to the lower end of the casing;

The rock crushing assembly includes a reaming shell, a hinged shaft, a reaming block, a recovery chamber, a first axial channel, a positioning rod, a pilot drill bit, a second axial channel, a first gauge piece, a second gauge piece and baffle;

The upper part of the expansion shell is fixed to the reducing joint. There are multiple recovery cavities on the side wall of the expansion shell. The expansion block is fixed inside the recovery cavity through a hinged shaft. The first diameter guard is fixed on the side wall of the expansion block. The first axial channel is a through hole at the bottom of the recovery chamber, which is used to pass the positioning rod. The pilot drill bit is fixed at the lower end of the expansion housing. The second axial channel is a through hole on the side wall of the pilot drill bit. The first The axial channel is connected with the second axial channel, the positioning rod is slidingly connected in the first axial channel and the second axial channel, and the second gauge piece is fixed on the side wall of the working layer of the pilot drill bit.

Preferably, the maximum diameter of the reaming shell and the pilot drill bit is smaller than the minimum diameter of the cone head.

Preferably, the hole expansion block is an impregnated diamond block material.

Beneficial effects of this utility model:

The drill pipe assembly is used to provide rotational torque for the bottom-hole rock-breaking assembly. The casing assembly realizes drilling with the casing through the reducing joint. The rock-breaking assembly can extend and retract the reaming block through the positioning rod. In addition, the centering bearing can center the drill pipe and casing to prevent wear of the drill pipe. Taken together, the utility model can effectively realize casing drilling in deep well operations without affecting the drilling and coring work. It has a simple structure, easy replacement of wearing parts, and has high practical value.

Description of the drawings

The drawings described here are used to provide a further understanding of the present utility model and constitute a part of the present application. The illustrative embodiments of the present utility model and their descriptions are used to understand the present utility model and do not constitute an improper limitation of the present utility model. In the attached picture:

Figure 1 is a front view of the utility model;

Figure 2 is a cross-sectional view of the utility model;

Figure 3 is a partially enlarged schematic diagram of position A in Figure 2;

Figure 4 is a partially enlarged schematic diagram of B in Figure 2;

Figure 5 is a schematic structural diagram of the enlarged hole shell of the utility model;

Figure 6 is a schematic structural diagram of the pilot drill bit of the present utility model.

Detailed ways

In order to explain the utility model more clearly, the utility model will be further described below in conjunction with the preferred embodiments and the accompanying drawings. Those skilled in the art will understand. The content described below is illustrative rather than restrictive, and should not be used to limit the scope of the present invention. In order to avoid obscuring the essence of the present invention, well-known methods, processes, flows, components and circuits are not described in detail.

In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically limited.

Referring to Figures 1 to 6, a geological coring drilling tool capable of continuous casing drilling is composed of a drill pipe assembly, a casing assembly and a rock-crushing assembly;

The drill pipe assembly includes conventional drill pipe 2, male joint 3, female joint 4, centering bearing 5, special drill pipe 6, reducing joint 7, core in place alarm 8, drilling fluid channel 9 and baffle 20;

The two ends of the conventional drill pipe 2 are respectively welded with a male joint 3 and a female joint 4. The female joint 4 of each conventional drill pipe 2 is threadedly fastened to each other with the male joint 3 of the adjacent conventional drill pipe 2 or the special drill pipe 6, and the bearings are aligned. 5 is arranged on the annular step of the female joint 4. The inner ring of the centering bearing 5 is in sliding fit with the outer wall of the conventional drill pipe 2. The outer ring of the centering bearing 5 is in sliding fit with the inner wall of the casing 1. The centering bearing 5 is installed on each section of the conventional drill pipe 2. The annular step of the female joint 4 has the function of centering the conventional drill pipe 2 and the casing 1 every distance of a regular drill pipe 2 to prevent the conventional drill pipe 2 and the casing 1 from wearing. A male joint 3 is welded to the upper end of the special drill pipe 6, and the lower end of the special drill pipe 6 is fixedly connected to the reducing joint 7. There is a through hole in the middle of the reducing joint 7 for passing the core in place alarm 8, and there are also rings around the through hole. There is a circle of drilling fluid channels 9 distributed for injecting drilling fluid from the surface into the well. The baffle 20 is fixed at the bottom of the core in-position alarm 8. When the core is full, the baffle 20 is held against the baffle 20 to block the drilling fluid channel 9. The surface If the pump pressure suddenly increases, it can be judged that the core is full;

The casing assembly includes casing 1 and cone head 21;

The lower end of the casing 1 is welded with a cone head 21. The function of the cone head 21 is to reduce the resistance of the casing 1 moving downhole;

The rock crushing assembly includes a reaming shell 10, a hinged shaft 11, a reaming block 12, a recovery chamber 13, a first axial channel 14, a positioning rod 15, a pilot drill bit 16, a second axial channel 17, and a first diameter guard. piece 18, the second gauge piece 19 and the baffle 20;

The upper part of the expanded hole housing 10 is fixed to the reducing joint 7. The side wall of the expanded hole housing 10 is provided with multiple (four are used as examples for illustration) recovery cavities 13. The expanded hole block 12 passes through the hinge shaft 11. It is fixed inside the recovery chamber 13. The recovery chamber 13 is used to recover the expansion block 12. The expansion block 12 is made of impregnated diamond block material. The first diameter guard 18 is fixed on the side wall of the expansion block 12. Its function is to achieve For reaming drilling of a drilling tool, the first axial channel 14 is a through hole at the bottom of the recovery chamber 13 and is used to pass the positioning rod 15. The pilot drill bit 16 is fixed on the lower end of the reaming housing 10, and can It is a conventional impregnated diamond drill bit or a polycrystalline diamond composite drill bit, etc., and is not limited by the type of drill bit. The second axial channel 17 is a through hole on the side wall of the pilot drill bit 16 and is axially connected with the first axial channel 14 for passing the positioning rod 15. The second gauge piece 19 is fixed on the pilot hole. The side wall of the working layer of the drill bit 16 is used to ensure the drilling diameter of the pilot drill bit 16.

Furthermore, the maximum diameter of the reaming housing 10 and the pilot drill bit 16 should be smaller than the minimum diameter of the cone head 21 to facilitate the passage of the casing 1 and the cone head 21 when the drilling tool is lowered and lifted.

The working principle of this utility model:

When the drilling tool is lowered, the drilling tool is in a pulling state. At this time, the positioning rod 15 is at the lowest position due to gravity and the extrusion of the reaming block 12. The reaming block 12 is retracted into the recovery chamber 13. When the drilling tool is lowered, At the bottom of the hole, the positioning rod 15 is first in extrusion contact with the rock at the bottom of the hole. The positioning rod 15 moves upward relative to the entire drilling tool, extruding the reaming block 12, and then the ground drives the conventional drill pipe 2 to drive the reaming block 12 and the pilot drill bit. 16 rotations, the reaming block 12 breaks the rock in the area below the casing 1, and the pilot drill bit 16 is used for coring. When the drilling weight is applied to the reducing joint 7, it will exert downward pressure on the cone head 21 to achieve casing drilling. When the core is full, the core resists the baffle 20 to block the drilling fluid channel 9, and the surface pump pressure suddenly increases. It can be judged that the core is full. At this time, when the drill is lifted, the positioning rod 15 will be moved due to gravity and reaming. The squeezing action of the block 12 returns to the lowest position, and the drilling tool passes through the cone head 21 and then through the casing 1.

In addition, the centering bearing 5 installed at the annular step of the female joint 4 of each section of conventional drill pipe 2 will perform centering between the conventional drill pipe 2 and the casing 1 at intervals of one section of conventional drill pipe 2. Prevent conventional drill pipe 2 and casing 1 from wearing.

Claims (3)

1. Geological coring drilling tool capable of realizing continuous drilling with casing, and is characterized in that: the drill rod assembly comprises a drill rod assembly, a sleeve assembly and a rock crushing assembly;

the drill rod assembly comprises a conventional drill rod (2), a male connector (3), a female connector (4), a centralizing bearing (5), a special drill rod (6), a reducing connector (7), a core in-place alarm (8), a drilling fluid channel (9) and a baffle plate (20);

the two ends of the conventional drill rods (2) are respectively welded with a male connector (3) and a female connector (4), the female connector (4) of each conventional drill rod (2) is mutually screwed and fastened with the male connector (3) of the adjacent conventional drill rod (2) or the special drill rod (6), a centralizing bearing (5) is arranged on an annular step of the female connector (4), an inner ring of the centralizing bearing (5) is in sliding fit with the outer wall of the conventional drill rod (2), an outer ring of the centralizing bearing (5) is in sliding fit with the inner wall of the sleeve (1), the lower end of the special drill rod (6) is fixedly connected with a reducer union (7), a through hole is formed in the middle of the reducer union (7) and used for passing through a core in-place alarm (8), a circle of drilling fluid channel (9) is circumferentially distributed around the through hole, and a baffle plate (20) is fixed at the bottom of the core in-place alarm (8);

the sleeve assembly comprises a sleeve (1) and a conical head (21) welded at the lower end of the sleeve (1);

the rock crushing assembly comprises a reaming shell (10), a hinge shaft (11), a reaming block (12), a recycling cavity (13), a first axial channel (14), a positioning rod (15), a pilot bit (16), a second axial channel (17), a first diameter-keeping piece (18), a second diameter-keeping piece (19) and a baffle plate (20);

the upper portion of the reaming shell (10) is fixed with the reducer union (7), a plurality of recovery cavities (13) are formed in the side wall of the reaming shell (10), the reaming blocks (12) are fixed inside the recovery cavities (13) through hinge shafts (11), first diameter-keeping pieces (18) are fixed on the side walls of the reaming blocks (12), a first axial channel (14) is a through hole in the bottom of the recovery cavities (13) and is used for being fixed at the lower end of the reaming shell (10) through positioning rods (15), a pilot bit (16) is fixed at the lower end of the reaming shell (10), a second axial channel (17) is a through hole in the side wall of the pilot bit (16), the first axial channel (14) is communicated with the second axial channel (17), the positioning rods (15) are connected in the first axial channel (14) and the second axial channel (17) in a sliding mode, and the second diameter-keeping pieces (19) are fixed on the side walls of the working layers of the pilot bit (16).

2. A geological coring drilling tool for continuous casing drilling as set forth in claim 1, wherein: the maximum diameter of the reamer housing (10) and the pilot bit (16) is smaller than the minimum diameter of the bit (21).

3. A geological coring drilling tool for continuous casing drilling as set forth in claim 1, wherein: the reaming block (12) is impregnated with a diamond block material.