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

Geological coring drilling tool capable of realizing continuous drilling with casing

Technical Field

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

Background

When the broken stratum and the gravel stratum are drilled, complex accidents such as block falling, shrinkage, even hole collapse and the like are extremely easy to occur, and the conventional methods such as mud wall protection and impact drilling clay wall protection cannot effectively stabilize the hole wall or when a large amount of mud is leaked, the following casing drilling technology is needed to maintain the hole wall stable.

At present, conventional casing drilling techniques are mainly divided into two types, namely eccentric casing drilling and concentric casing drilling. The eccentric casing drilling technology has higher efficiency, but the eccentric drill bit is easy to have hole accidents when the eccentric drill bit is folded and fails. The inner pipe of the concentric casing drilling technology can be reversely failed to be separated when being blocked by large rock fragments, and the drilling depth is limited. The common hard alloy buttons used in the casing drilling process are matched with a down-the-hole hammer for drilling, so that the formation drilling of the casing drilling technology, such as dry hot rock formation, is limited, besides the large buried depth and irregular impact rotary drilling well wall, the granite of the well wall is easy to crack under the action of thermal stress and quenching, and the drilling is very easy to clamp. In addition, due to the elasticity of the drill rod, the drill rod is in a twist shape in the underground, and is easy to rub with the casing so as to be damaged.

In combination, the existing casing drilling process cannot meet the deep well drilling requirements. Based on the above, a novel drilling tool is urgently needed to solve the defects of the prior art and improve the application range of the casing drilling technology.

Disclosure of Invention

Aiming at the problems and the disadvantages of the prior art, the utility model aims to provide a geological coring drilling tool capable of realizing continuous drilling with a casing, which is mainly used for meeting the technical requirements of deep well drilling with the casing and preventing friction damage between a drill rod and the casing.

The technical scheme adopted by the utility model for achieving the purpose is as follows:

a geological coring drilling tool capable of realizing continuous casing drilling comprises a drill rod assembly, a casing assembly and a rock crushing assembly;

the drill rod assembly comprises a conventional drill rod, a male connector, a female connector, a centralizing bearing, a special drill rod, a reducer union, a core in-place alarm, a drilling fluid channel and a baffle;

the two ends of the conventional drill rod are respectively welded with a male connector and a female connector, the female connector of each conventional drill rod is fastened with the male connector of an adjacent conventional drill rod or a special drill rod by mutual threads, a righting bearing is arranged on an annular step of the female connector, an inner ring of the righting bearing is in sliding fit with the outer wall of the conventional drill rod, an outer ring of the righting bearing is in sliding fit with the inner wall of a sleeve, the lower end of the special drill rod is fixedly connected with a reducer union, a through hole is formed in the middle of the reducer union and used for passing through a core in-place alarm, a circle of drilling fluid channels are circumferentially distributed around the through hole, and a baffle is fixed at the bottom of the core in-place alarm;

the sleeve assembly comprises a sleeve and a conical head welded at the lower end of the sleeve;

the rock crushing assembly comprises a reaming shell, a hinge shaft, a reaming block, a recycling cavity, a first axial channel, a positioning rod, a pilot bit, a second axial channel, a first diameter-keeping piece, a second diameter-keeping piece and a baffle;

the upper portion of the reaming shell is fixed with the reducer union, a plurality of recovery cavities are formed in the side wall of the reaming shell, the reaming blocks are fixed in the recovery cavities through hinge shafts, first diameter-preserving sheets are fixed on the side walls of the reaming blocks, the first axial channels are through holes in the bottoms of the recovery cavities and are used for being fixed at the lower end of the reaming shell through positioning rods, the second axial channels are through holes in the side walls of the reaming bits, the first axial channels are communicated with the second axial channels, the positioning rods are slidably connected in the first axial channels and the second axial channels, and the second diameter-preserving sheets are fixed on the side walls of the working layers of the reaming bits.

Preferably, the maximum diameter of the reamer housing and pilot bit is less than the minimum diameter of the bit.

Preferably, the reaming block is a diamond impregnated block material.

The utility model has the beneficial effects that:

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.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model, wherein:

FIG. 1 is a front view of the present utility model;

FIG. 2 is a cross-sectional view of the present utility model;

FIG. 3 is an enlarged schematic view of a portion of FIG. 2 at A;

FIG. 4 is an enlarged schematic view of a portion of FIG. 2 at B;

FIG. 5 is a schematic view of the reamer housing of the present utility model;

fig. 6 is a schematic view of the structure of the pilot bit according to the present utility model.

Detailed Description

In order to more clearly illustrate the present utility model, the present utility model will be further described with reference to preferred embodiments and the accompanying drawings. Those skilled in the art will appreciate that. The following detailed description is illustrative and not restrictive, and should not be taken as limiting the scope of the utility model. Well-known methods, procedures, flows, components and circuits have not been described in detail so as not to obscure the nature of the utility model.

In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

Referring to fig. 1 to 6, a geological coring drilling tool capable of realizing continuous casing drilling is composed of a drill rod assembly, a casing 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 specially-made drill rod 6, a reducing connector 7, a core in-place alarm 8, a drilling fluid channel 9 and a baffle 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 fastened with the male connector 3 of the adjacent conventional drill rod 2 or a specially-made drill rod 6 in a threaded manner, a righting bearing 5 is arranged on an annular step of the female connector 4, an inner ring of the righting bearing 5 is in sliding fit with the outer wall of the conventional drill rod 2, an outer ring of the righting bearing 5 is in sliding fit with the inner wall of a casing 1, the righting bearing 5 is arranged at the annular step of the female connector 4 of each conventional drill rod 2, the effect is that the distance between each conventional drill rod 2 and the casing 1 is righted for each interval of the conventional drill rod 2, the conventional drill rod 2 and the casing 1 are prevented from being worn, the upper end of the specially-made drill rod 6 is welded with a male connector 3, the lower end of the specially-made drill rod 6 is fixedly connected with a reducer union 7, a through hole is formed in the middle of the reducer union 7, a circle of drilling fluid channel 9 is annularly distributed around the through hole for filling drilling fluid into the hole from the ground, the bottom of the in the position alarm 8, the baffle 20 is fixed at the bottom of the position of the core 20, after the core is fully taken, the baffle 20 is used for the core is pushed against the baffle 20, and the core drilling fluid channel is fully pumped up in the state, and the core is prevented from the core dead state;

the sleeve assembly comprises a sleeve 1 and a cone head 21;

the lower end of the sleeve 1 is welded with a conical head 21, and the conical head 21 has the function of reducing the resistance of the sleeve 1 to downhole movement;

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

the upper part of the reaming shell 10 is fixed with the reducer union 7, the side wall of the reaming shell 10 is provided with a plurality of (four are taken as an example for illustration in the utility model) recovery cavities 13, the reaming blocks 12 are fixed inside the recovery cavities 13 through hinge shafts 11, the recovery cavities 13 are used for recovering the reaming blocks 12, the reaming blocks 12 are made of diamond-impregnated block materials, the side wall of each reaming block 12 is fixed with a first diameter-keeping sheet 18 which is used for realizing reaming and drilling of a drilling tool, the first axial channel 14 is a through hole at the bottom of the recovery cavity 13 and is used for fixing a pilot bit 16 at the lower end of the reaming shell 10 through positioning rods 15, and the pilot bit 16 can be a conventional diamond-impregnated bit or a polycrystalline diamond compact bit and is not limited by the type of the drilling tool. The second axial channel 17 is a through hole on the side wall of the pilot bit 16, and is axially communicated with the first axial channel 14, and is used for passing through the positioning rod 15, and the second gauge sheet 19 is fixed on the side wall of the working layer of the pilot bit 16, and is used for ensuring the drilling diameter of the pilot bit 16.

Further, the maximum diameter of the reamer housing 10 and pilot bit 16 is smaller than the minimum diameter of the bit 21 to facilitate passage of the drill through the casing 1 and bit 21 during lowering and lifting.

The working principle of the utility model is as follows:

when the drilling tool is lowered, the drilling tool is in a lifting state, at the moment, the positioning rod 15 is at the lowest position under the action of gravity and the extrusion action of the reaming block 12, the reaming block 12 is retracted into the recovery cavity 13, when the drilling tool is lowered to the bottom of a hole, the positioning rod 15 is in extrusion contact with rock at the bottom of the hole, the positioning rod 15 moves upwards relative to the whole drilling tool, the reaming block 12 is extruded, then the ground drives the conventional drilling rod 2 to drive the reaming block 12 and the pilot bit 16 to rotate, the reaming block 12 breaks the rock in the area below the casing pipe 1, and the pilot bit 16 is used for coring. The application of weight on bit 7 applies downward pressure to bit 21 to effect drilling with casing. After the full barrel is cored, the core is propped against the baffle 20 to block the drilling fluid channel 9, the surface pumping pressure is suddenly increased, the core is judged to be in a full state, at this time, the drill is lifted, the positioning rod 15 can return to the lowest position again due to the gravity action and the extrusion action of the reaming block 12, and the drill passes through the conical head 21 and then the casing 1.

In addition, the centralizing bearing 5 installed at the annular step of the female joint 4 of each section of the conventional drill rod 2 can centralize the conventional drill rod 2 and the casing 1 at each interval, so that the conventional drill rod 2 and the casing 1 are prevented from being worn.

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.