Front-mounted eccentric double-tube directional drilling and injection tool

Abstract

The invention discloses a front-mounted eccentric double-tube guided drilling and injection machine, comprising a guide section, the guide section comprising an inner tube and an outer tube, one end of the inner tube being mounted on one end of the outer tube through a self-aligning bearing, and the other end being connected to a drum-shaped gear coupling, and the inner tube being eccentrically suspended in the outer tube through the self-aligning bearing and the drum-shaped gear coupling. The invention is that a double-layer drill pipe is driven by a double-power head drilling rig to rotate in opposite directions, and the inner drill pipe rotates continuously whether drilling a straight hole or directional deflection; and the outer drill pipe is directional deflection when not rotating, and acts as a casing when drilling a straight hole. The machine combines the structure of guided drilling and rotary spraying to realize the dual functions of guided drilling and back-dragging rotary spraying. The inner tube is connected to the inner shaft through a drum-shaped gear coupling to ensure that the axes of the inner tube and the outer tube at the rear end of the guide section coincide, and the inner and outer drill pipes are conveniently connected. The drum-shaped gear coupling can not only transmit drilling pressure and torque, but also has sealing properties to ensure that the fluid in the center hole of the inner tube does not leak into the annular space between the inner tube and the outer tube.

Description

Technical Field

[0001] The invention relates to drilling equipment, in particular to a front-mounted eccentric double-tube guiding drilling and injection machine. Background Art

[0002] Due to the complexity of the strata, the large differences in pollution levels, and the difficulty in remediating groundwater pollution, the remediation functional materials have the best remediation effect when they are precisely placed on the pollution. Therefore, whether the remediation functional materials can be accurately injected into the target groundwater layer is the prerequisite for the success of in-situ remediation. Precision drilling and intelligent injection are the two key technologies of injection remediation.

[0003] The current injection methods in China are: (1) drilling injection, such as injection using the GeoProbe drilling rig. The equipment is small in scale and flexible, but has low pressure and injection efficiency, and is mainly suitable for solution-type repair materials. Granular materials are prone to clogging grouting holes; (2) well injection, which can be injected at normal pressure or pressurized, is more suitable for sand layers or loose formations with liquid materials. It is greatly affected by site conditions and requires a thorough understanding of the site's geological conditions; (3) jet injection, which is often carried out in conjunction with the single-tube method and the double-tube method. It has the characteristics of small jet depth restrictions and can be injected at multiple angles.

[0004] Horizontal directional drilling can lay various pipelines in most strata, but when encountering easily collapsed strata such as gravel and fine sand, conventional single-tube drilling technology can no longer guide drilling normally. The main characteristics of this type of strata are loose structure, poor cementation, poor self-stabilization ability, and high strength of single rocks. Therefore, there are the following difficulties in horizontal directional drilling construction in gravel strata: First, the problem of well wall stability. When the loose gravel strata are drilled, the hole wall is very likely to collapse under the scouring of mud and the disturbance of drilling tools; second, the problem of guidance. When drilling with horizontal directional drilling technology in soft and hard gravel strata, it is difficult to control the direction of the borehole when encountering large boulders; third, the problem of rock crushing. Unlike drilling in rock strata, when drilling in gravel strata, the pebble particles will not be crushed by the drill bit but will rotate with the drill bit, which results in the energy transmitted from the ground not being effectively used to crush the rock. Summary of the invention

[0005] In view of the shortcomings and deficiencies in the above-mentioned prior art, the object of the present invention is to provide a front-mounted eccentric double-tube guided drilling and injection machine capable of guided drilling in loose formations and jetting to repair soil during the backhaul process.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A front-mounted eccentric double-tube guiding drilling and injection machine comprises a guiding section, wherein the guiding section comprises an inner tube and an outer tube sleeved on the inner tube, one end of the inner tube is mounted on one end of the outer tube via a self-aligning bearing, and the other end is connected to a drum-shaped gear coupling, and the inner tube is eccentrically suspended in the outer tube via the self-aligning bearing and the drum-shaped gear coupling.

[0008] Preferably, a plurality of jet nozzles are provided on the outer wall of one end of the outer tube provided with the self-aligning bearing, and the plurality of jet nozzles are evenly distributed in a ring shape along the circumference of the outer wall; the jet nozzles extend obliquely inward to communicate with the annular space between the outer tube and the inner tube.

[0009] Preferably, a groove is formed on the outer wall of the end of the outer tube provided with the self-aligning bearing, a beveling shoe is filled in the groove, and the beveling shoe is fixed in the groove by bolts; the bevel of the beveling shoe faces the end of the outer tube provided with the self-aligning bearing.

[0010] Preferably, the cylindrical surface of the outer tube is divided into N equal parts, a groove is provided at one of the division positions, and a jet nozzle is provided at the remaining division positions.

[0011] Preferably, it also includes a reducing joint, which is connected to the end of the outer tube away from the self-aligning bearing; and the drum-shaped gear coupling is arranged in the reducing joint.

[0012] Preferably, the drum gear coupling includes a connecting sleeve, the inner wall of which forms an annular boss; an inner pipe joint is installed at the port of the connecting sleeve facing the inner tube, the inner pipe joint is threadedly assembled into the connecting sleeve, and the inner pipe joint is inserted until it abuts against the annular step surface of the boss.

[0013] Preferably, it also includes an inner shaft, which is inserted into the connecting sleeve from the other port of the connecting sleeve, and the end of the inner shaft inserted into the connecting sleeve has an arc-shaped end face, and the inner pipe joint has an arc-shaped groove corresponding to the arc-shaped end face; the side wall of the inner shaft corresponding to the boss position forms an arc-shaped flange, and the vertex of the arc-shaped flange rolls with the inner wall of the boss; a sealing joint is threadedly assembled at the end of the connecting sleeve corresponding to the inner shaft inserted, and the sealing joint blocks the end of the inner shaft inserted into the connecting sleeve in the connecting sleeve.

[0014] Preferably, the position of the inner shaft corresponding to the sealing joint forms a circle of conical surface around the axis, and the sealing joint is processed with a clearance groove corresponding to the conical surface for the inner shaft to swing relative to the axis of its connecting sleeve.

[0015] Preferably, the mating surfaces of the inner pipe joint and the connecting sleeve as well as the mating surfaces of the arc-shaped end surface and the arc-shaped groove are all sealed by sealing rings.

[0016] Preferably, an annular step surface is provided on the inner wall of the outer tube corresponding to the self-aligning bearing, a bearing retaining ring of the self-aligning bearing rests on the annular step surface, and one end of the self-aligning bearing facing the outside of the outer tube is encapsulated at the end of the outer tube through a bearing end cover; a probe bin is provided on the outer tube, the probe bin is filled with a probe, and the probe bin is sealed by a wave-transmitting skin.

[0017] Compared with the prior art, the embodiments of the present invention have at least the following advantages:

[0018] This machine uses a double-power head drill rig to drive double-layer drill pipes to rotate in opposite directions. Whether drilling a straight hole or directional deflection, the inner drill pipe continues to rotate, while the outer drill pipe can be used for directional deflection and serve as casing.

[0019] Specific:

[0020] First, the guided drilling and injection machine combines the structural requirements of guided drilling and rotary injection, and can realize the dual functions of guided drilling and back-draft rotary injection.

[0021] Second, the inner tube is connected to the inner shaft through a drum-shaped gear coupling to ensure that the axes of the inner tube and the outer tube at the rear end of the guide joint coincide, making it convenient to connect the inner and outer drill rods.

[0022] Third, the drum gear coupling can not only transmit drilling pressure and torque, but also has sealing properties, which can ensure that the fluid in the center hole of the inner tube does not leak into the annular space between the inner tube and the outer tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a front-mounted eccentric double-tube guiding drilling and injection machine of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the structure in the middle AA direction;

[0025] Figure 3 for Figure 1 Schematic diagram of the structure in the middle BB direction;

[0026] Figure 4 for Figure 1 A partial enlarged view of the structure at A in the middle;

[0027] Figure 5 for Figure 1 A partial enlarged view of the structure at point B in the middle.

[0028] In the figure, 1, inner tube; 2, outer tube; 3, self-aligning bearing; 4, inner shaft; 5, connecting sleeve; 6, deflecting boot; 7, jet nozzle; 8, reducer; 9, boss; 10, inner tube joint; 11, plugging joint; 12, inner drill pipe joint; 13, arc flange; 14, tapered surface; 15, bearing end cover; 16, wave-transmitting skin; 17, conversion joint. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the embodiments and drawings. The following embodiments are only illustrative and not restrictive, and the protection scope of the present invention cannot be limited thereto.

[0030] A front-mounted eccentric double-tube guiding drilling and injection machine includes a guiding section, which includes an inner tube 1 and an outer tube 2 sleeved on the inner tube 1. One end of the inner tube 1 is installed on one end of the outer tube 2 through a self-aligning bearing 3, and the other end is connected to a drum-shaped gear coupling. The inner tube 1 is eccentrically suspended in the outer tube 2 through the self-aligning bearing 3 and the drum-shaped gear coupling.

[0031] A plurality of jet nozzles 7 are provided on the outer wall of one end of the outer tube 2 provided with the self-aligning bearing 3. The plurality of jet nozzles 7 are evenly distributed in a ring shape along the circumference of the outer wall. The jet nozzles 7 extend obliquely inwardly to communicate with the annular space between the outer tube 2 and the inner tube 1.

[0032] A groove is formed on the outer wall of one end of the outer tube 2 provided with the self-aligning bearing 3, and a beveling shoe 6 is filled in the groove. The beveling shoe 6 is fixed in the groove by bolts; the inclined surface of the beveling shoe 6 faces the end of the outer tube 2 provided with the self-aligning bearing 3.

[0033] The cylindrical surface of the outer tube 2 is divided into N equal parts, a groove is provided at one of the division positions, and a jet nozzle 7 is provided at the remaining division positions.

[0034] It also includes a reducer 8 , which is connected to one end of the outer tube 2 away from the self-aligning bearing 3 ; the drum-shaped gear coupling is arranged in the reducer 8 .

[0035] The drum gear coupling includes a connecting sleeve 5, the inner wall of which forms an annular boss 9; an inner pipe joint 10 is installed at the end of the connecting sleeve 5 facing the inner tube 1, and the inner pipe joint 10 is threadedly assembled into the connecting sleeve 5, and the inner pipe joint 10 is inserted until it abuts against the annular step surface of the boss 9.

[0036] It also includes an inner shaft 4, which is inserted into the connecting sleeve 5 from the other end of the connecting sleeve 5. The end of the inner shaft 4 inserted into the connecting sleeve 5 has an arc-shaped end face, and the inner pipe joint 10 has an arc-shaped groove corresponding to the arc-shaped end face; the side wall of the inner shaft 4 corresponding to the position of the boss 9 forms an arc-shaped flange 13, and the vertex of the arc-shaped flange 13 rolls with the inner wall of the boss 9; a plugging joint 11 is threadedly assembled at the end of the connecting sleeve 5 corresponding to the insertion of the inner shaft 4, and the plugging joint 11 blocks the end of the inner shaft 4 inserted into the connecting sleeve 5 in the connecting sleeve 5.

[0037] The position of the inner shaft 4 corresponding to the sealing joint 11 forms a circle of conical surface 14 around the axis, and the sealing joint 11 is processed with a clearance groove corresponding to the conical surface 14 for the inner shaft 4 to swing relative to the axis of its connecting sleeve 5. The clearance groove preferably has a conical inner wall, the large end opening allows the conical surface 14 to enter, and the small end opening diameter is sufficient to clamp the flange formed by the conical surface 14 to prevent the inner shaft 4 from escaping from the connecting sleeve 5.

[0038] The mating surfaces of the inner pipe joint 10 and the connecting sleeve 5 as well as the mating surfaces of the arc-shaped end surface and the arc-shaped groove are all sealed by sealing rings.

[0039] An annular step surface is formed on the inner wall of the outer tube 2 corresponding to the self-aligning bearing 3, and a bearing retaining ring of the self-aligning bearing 3 abuts against the annular step surface. One end of the self-aligning bearing 3 facing the outside of the outer tube 2 is encapsulated at the end of the outer tube 2 through a bearing end cover 15; a probe bin is formed on the outer tube 2, and a probe is loaded in the probe bin, and the probe bin is sealed by a wave-transmitting skin 16.

[0040] Working principle description:

[0041] The guide drilling injection machine is connected to the drill bit and the drill rod through a guide joint. The outer tube 2 protrudes from one end of the inner tube 1 corresponding to the self-aligning bearing 3, and a conversion joint 17 is installed at the end of the inner tube 1, and the conversion joint 17 is connected to the drill bit; an inner drill rod joint 12 is installed at one end of the inner shaft 4 protruding from the reducer 8, and the inner shaft 4 is inserted into the inner drill rod joint 12. Threads are machined on the outer wall of the inner shaft 4 inserted into the inner drill rod joint 12, and the inner drill rod joint 12 and the inner shaft 4 are threadedly connected.

[0042] Since the front end of the inner tube 1 is suspended on the outer tube 2 by the self-aligning bearing 3, the axis of the drill bit intersects with the axis of the outer tube 2 at a certain angle, thereby generating a deflecting force. In addition, the deflecting tool surface (deflecting shoe 6) set on the outer tube 2 can also provide additional deflecting force. When the drilling direction is to be changed, the deflecting surface is rotated to the corresponding position and fixed, and the inner drill rod is rotated alone; when drilling a straight hole, the inner and outer drill rods are rotated at the same time. When the repair agent is injected by back-dragging, the repair agent is pressed into the annular gap between the inner tube 1 and the outer tube 2 with high pressure, so that the repair agent is ejected from the nozzle at high speed, cutting and stirring the soil, so that it is evenly mixed with the soil to be repaired, and the purpose of repair is achieved.

[0043] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A front-mounted eccentric double-tube guiding drilling and injection tool, comprising a guiding section, the guiding section comprising an inner tube (1) and an outer tube (2) sleeved on the inner tube (1), characterized in that: One end of the inner tube (1) is mounted on one end of the outer tube (2) via a self-aligning bearing (3), and the other end is connected to a drum-shaped gear coupling. The inner tube (1) is eccentrically suspended in the outer tube (2) via the self-aligning bearing (3) and the drum-shaped gear coupling. It also comprises a reducing joint (8), wherein the reducing joint (8) is connected to an end of the outer tube (2) away from the self-aligning bearing (3); the drum-shaped gear coupling is arranged in the reducing joint (8); The drum gear coupling comprises a connecting sleeve (5), the inner wall of which forms an annular boss (9); an inner pipe joint (10) is installed at the end of the connecting sleeve (5) facing the inner pipe (1), the inner pipe joint (10) is threadedly assembled into the connecting sleeve (5), and the inner pipe joint (10) is inserted until it abuts against the annular step surface of the boss (9); The invention also comprises an inner shaft (4), the inner shaft (4) is inserted into the connecting sleeve (5) from the other end of the connecting sleeve (5), the end of the inner shaft (4) inserted into the connecting sleeve (5) has an arc-shaped end face, and the inner pipe joint (10) is provided with an arc-shaped groove corresponding to the arc-shaped end face; the side wall of the inner shaft (4) corresponding to the position of the boss (9) forms an arc-shaped flange (13), and the vertex of the arc-shaped flange (13) is rollingly matched with the inner wall of the boss (9); a plugging joint (11) is threadedly assembled at the end of the connecting sleeve (5) corresponding to the inner shaft (4) inserted, and the plugging joint (11) blocks the end of the inner shaft (4) inserted into the connecting sleeve (5) in the connecting sleeve (5).

2. The front-mounted eccentric double-tube guiding drilling and injection tool according to claim 1 is characterized in that: A plurality of jet nozzles (7) are provided on the outer wall of one end of the outer tube (2) provided with the self-aligning bearing (3), and the plurality of jet nozzles (7) are evenly distributed in a ring shape along the circumference of the outer wall; the jet nozzles (7) extend obliquely inwardly to communicate with the annular space between the outer tube (2) and the inner tube (1).

3. The front-mounted eccentric double-tube guiding drilling and injection tool according to claim 1 is characterized in that: An embedding groove is formed on the outer wall of one end of the outer tube (2) provided with the self-aligning bearing (3), and a bevel shoe (6) is filled in the embedding groove. The bevel shoe (6) is fixed in the embedding groove by bolts; the bevel surface of the bevel shoe (6) faces the end of the outer tube (2) provided with the self-aligning bearing (3).

4. The front-mounted eccentric double-tube guiding drilling and injection tool according to claim 3 is characterized in that: The cylindrical surface of the outer tube (2) is divided into N equal parts, a groove is provided at one of the division positions, and a jet nozzle (7) is provided at the remaining division positions.

5. The front-mounted eccentric double-tube guiding drilling and injection tool according to claim 1, characterized in that: The position of the inner shaft (4) corresponding to the sealing joint (11) forms a circle of conical surface (14) around the axis, and the sealing joint (11) is processed with a clearance groove corresponding to the conical surface (14) for the inner shaft (4) to swing relative to the axis of its connecting sleeve (5).

6. The front-mounted eccentric double-tube guiding drilling and injection tool according to claim 1, characterized in that: The matching surfaces of the inner pipe joint (10) and the connecting sleeve (5) as well as the matching surfaces of the arc-shaped end surface and the arc-shaped groove are all sealed by a sealing ring.

7. The front-mounted eccentric dual-tube guiding drilling and injection tool according to claim 1, characterized in that: The inner wall of the outer tube (2) is provided with an annular step surface corresponding to the self-aligning bearing (3), the bearing retaining ring of the self-aligning bearing (3) abuts against the annular step surface, and the end of the self-aligning bearing (3) facing the outside of the outer tube (2) is sealed at the end of the outer tube (2) through a bearing end cover (15); a probe chamber is provided on the outer tube (2), a probe is loaded in the probe chamber, and the probe chamber is sealed by a wave-transmitting skin (16).

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