CN115637927A

CN115637927A - Double pipe

Info

Publication number: CN115637927A
Application number: CN202110814021.7A
Authority: CN
Inventors: 徐梓辰
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2023-01-24

Abstract

The invention provides a double pipe, which comprises an inner pipe column and an outer pipe column, wherein the lower end of the inner pipe column is connected with a guide device, the lower end of the guide device is connected with a drill bit, the guide device can drive the drill bit to deflect by a preset angle, and a through flow channel for circulating drilling media to circulate is arranged in the inner pipe column; the flexible outer pipe column is sleeved outside the inner pipe column, an annular space for circulation of drilling circulation media is formed between the flexible outer pipe column and the inner pipe column, and the upper portion of the guide device or the lower portion of the inner pipe column is hinged to the lower portion of the flexible outer pipe column. The double pipe can drive the drill bit to deflect a preset angle according to a preset direction through the guide device under the rotating condition so as to change the track of a well hole, thereby realizing short build slope; the flexible outer pipe column can well bear axial pressure so as to transmit torque for driving the drill bit to rotate to the guiding device, and therefore guiding drilling with a certain well hole extending length is achieved.

Description

Double pipe

Technical Field

The invention relates to the technical field of drilling and oil and gas exploitation, in particular to a double pipe.

Background

Exploration and development of underground material resources and space resources requires extensive application of drilling techniques. The existing steering drilling technology mainly comprises a downhole motor steering drilling technology and a rotary steering drilling technology. The maximum build-up rate of the technology can not exceed 15 degrees/30 meters generally, and the short-radius pilot drilling of the drilling controllable track cannot be realized or the pilot drilling can be continued at the bottom end of the existing short-radius well section. In the prior art, a plurality of radial or short-radius drilling technologies which cannot effectively control the well track exist, and the technologies have poor effects on developing and utilizing underground resources.

Disclosure of Invention

It is an object of the present invention to provide a dual pipe enabling guided drilling with a certain wellbore extension.

To achieve the above object, the present invention provides a double pipe comprising:

the lower end of the inner pipe column is connected with a guide device, the lower end of the guide device is connected with a drill bit, the guide device can drive the drill bit to deflect for a preset angle, and a through flow channel for circulation of a drilling circulation medium is arranged inside the inner pipe column;

the flexible outer pipe column is sleeved outside the inner pipe column, an annular space for circulation of drilling circulating media is formed between the flexible outer pipe column and the inner pipe column, and the upper portion of the guide device or the lower portion of the inner pipe column is hinged to the corresponding position of the lower portion of the flexible outer pipe column.

The double pipe as above, wherein, flexible outer tubular column includes a plurality of outer joint nipple joints of articulated in proper order from top to bottom, adjacent two meet through outer hinge structure between the outer joint nipple joint, be located the below outer joint nipple joint with guider meets.

The double pipe as described above, wherein a plurality of centralizing devices are provided between the flexible outer pipe string and the inner pipe string at intervals.

The double tube as described above, wherein the righting device is a righting bearing or a roller centralizer.

The double pipe comprises an outer connecting short section and an inner pipe column, wherein the outer connecting short section is connected with the inner pipe column through a connecting device, and the outer connecting short section is connected with the inner pipe column through a connecting device.

The double pipe as described above, wherein the inner pipe string is a pressure-bearing hose or a rigid pipe string.

The double pipe as described above, wherein a suspension device is connected between the inner pipe string and the flexible outer pipe string, and the suspension device is located at an upper portion of the inner pipe string.

The dual pipe as described above, wherein the guide is connected to the wellhead control endpoint by a jumper line.

The double pipe comprises a transmission shaft, a bearing body and a sleeve, wherein the transmission shaft, the bearing body and the sleeve are sequentially sleeved from inside to outside, the upper end of the sleeve is hinged with the lower end of the flexible outer pipe column, the upper end of the bearing body is connected with the lower end of the inner pipe column, the lower end of the transmission shaft is connected with the drill bit, an annular movable space is arranged between the transmission shaft and the bearing body, and a deflection mechanism is arranged in the annular movable space and can drive the transmission shaft and the bearing body to move relatively.

The double tube as described above, wherein the upper portion of the sleeve is connected to the bearing body through a first hinge structure, the deflection mechanism includes at least three sets of driving hydraulic cylinders circumferentially spaced along the lower portion of the bearing body, the driving hydraulic cylinders include piston structure accommodating cavities disposed in the outer wall of the bearing body and driving piston structures disposed in the piston structure accommodating cavities, and the driving piston structures can push the transmission shaft and the bearing body to move relatively.

The double pipe as described above, wherein the deflection mechanism includes an eccentric ring and an electrically driven actuator, the electrically driven actuator is disposed on the bearing body, the eccentric ring is disposed between the transmission shaft and the bearing body, a lower portion of the transmission shaft is connected to the bearing body through a second hinge structure, the electrically driven actuator can drive the eccentric ring to rotate, the rotation of the eccentric ring can drive the transmission shaft and the bearing body to move relatively, a first centering structure is disposed between an upper portion of the bearing body and the sleeve, a second centering structure is disposed between a lower portion of the bearing body and the sleeve, and the second hinge structure is located between the first centering structure and the second centering structure.

Compared with the prior art, the invention has the following advantages:

according to the double pipe, the guide device is arranged, so that the drill bit can be driven by the guide device to deflect a preset angle in a preset direction under the rotating condition, the track of a well hole is changed, and the short build slope is realized; through the arrangement of the flexible outer pipe column, under the rotating condition, the torque for driving the drill bit to rotate can be well transmitted to the guide device, and therefore the guide drilling with a certain well hole extension length is achieved.

Drawings

The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention. Wherein:

FIG. 1 is a schematic view of a double pipe of the present invention;

FIG. 2 is another schematic construction of the double tube of the present invention;

fig. 3 is a schematic view of another structure of the double pipe of the present invention.

The reference numbers illustrate:

1. an inner tubular column; 11. a through flow channel; 111. a pressure-bearing hose; 112. a rigid tubular string;

2. a guide device; 21. a sleeve; 22. a load-bearing body; 23. a drive shaft; 24. a first hinge structure; 25. driving the hydraulic cylinder; 26. an eccentric ring; 27. an electrically driven actuator; 28. a second hinge structure; 291. a first righting structure; 292. a second righting structure;

3. a drill bit;

4. a flexible outer tubing string; 41. an external connection short section; 42. an outer hinge structure;

5. an annular space;

6. a suspension device;

7. a righting device; 71. righting the bearing; 72. a roller centralizer;

9. and (6) connecting the jumper wires.

Detailed Description

In order to clearly understand the technical solution, the purpose and the effect of the present invention, a detailed description of the present invention will be described with reference to the accompanying drawings. Where adjective or adverbial modifiers "upper" and "lower", "inner" and "outer" are used merely to facilitate relative reference between groups of terms, and do not describe any particular directional limitation on the modified terms. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

As shown in fig. 1, 2 and 3, the present invention provides a dual pipe comprising an inner pipe string 1 and a flexible outer pipe string 4, wherein:

the lower end of the inner pipe column 1 is connected with a guide device 2, the lower end of the guide device 2 is connected with a drill bit 3, the guide device 2 can drive the drill bit 3 to deflect a preset angle, namely the guide device 2 can drive the drill bit 3 to deflect the preset angle in a preset direction, so that the well track is changed, and a short build slope is realized, a through flow passage 11 for circulating a drilling circulation medium is arranged in the inner pipe column 1, and the drilling circulation medium can flow to the drill bit 3 through the through flow passage 11 to drive the drill bit 3 to perform drilling operation, wherein the specific structure and the working principle of the drill bit 3 are the prior art, and are not described herein again;

the flexible outer tubular column 4 is sleeved outside the inner tubular column 1, an annular space 5 for circulation of drilling circulation media is formed between the flexible outer tubular column 4 and the inner tubular column 1, the drilling circulation media can return to a wellhead from the annular space 5, and the upper portion of the guide device 2 or the lower portion of the inner tubular column 1 is hinged to the corresponding position of the lower portion of the flexible outer tubular column 4, so that the flexible outer tubular column 4 can transmit drilling pressure torque to the guide device 2 and can play a role in protecting the inner tubular column 1.

According to the double-pipe, the guide device 2 is arranged, so that the drill bit 3 can be driven by the guide device 2 to deflect by a preset angle according to a preset direction under the rotating condition, the track of a well hole is changed, and the short build-up rate is realized; through the arrangement of the flexible outer tubular column 4, under the condition of rotation, the torque for driving the drill bit 3 to rotate can be well transmitted to the steering device 2, and therefore the steering drilling with a certain well hole extension length is achieved.

Further, as shown in fig. 1, fig. 2 and fig. 3, the flexible outer tubular column 4 includes a plurality of outer connection short sections 41 hinged from top to bottom in sequence, two adjacent outer connection short sections 41 are connected through an outer hinge structure 42, the outer connection short section 41 located at the bottom is connected with the upper end of the guiding device 2, that is, the flexible outer tubular column 4 is of a hinge structure, because the diameter of the flexible outer tubular column 4 is large, in order to meet the requirement of deflection, the flexibility of the flexible outer tubular column 4 can be increased to the maximum extent by adopting a hinge mode, wherein, the outer hinge structure 42 can be a matching structure of a universal joint and a sleeve 21 in the prior art, and can also be a matching structure of a ball seat and a ball head in the prior art, which is not repeated herein.

Of course, the flexible outer tubular string 4 may also be a slotted tube, and in order to ensure the sealing of the annular space 5, the slots of the slotted tube are filled with a sealing material.

Further, the inner pipe column 1 is a pressure-bearing hose 111 or a rigid pipe column 112, and when in use, the pressure-bearing hose 111 or the rigid pipe column 112 can be selected as the inner pipe column 1 according to the track of a drilled well.

Further, as shown in fig. 1, fig. 2 and fig. 3, a plurality of centering devices 7 are arranged between the flexible outer tubular column 4 and the inner tubular column 1 at intervals, and the centering devices 7 can keep an annular space 5 formed between the inner tubular column 1 and the flexible outer tubular column 4 all the time, so as to ensure that a circulating medium can flow to the drill bit 3 from the inside of the inner tubular column 1 and then return to the wellhead from the annular space 5 between the inner tubular column 1 and the flexible outer tubular column 4.

Further, all be equipped with righting device 7 between each outer coupling nipple 41 and the inner string 1 to produce bucking or distortion between each outer coupling nipple 41, hinder the weight on bit moment of torsion transmission, thereby make the weight on bit moment of torsion can transmit smoothly.

Still further, as shown in fig. 1 and 2, the centralizer 7 is a centralizer bearing 71 or a roller centralizer 72, and specifically, the centralizer bearing 71 and the roller centralizer 72 both enable the inner string 1 to rotate relative to the flexible outer string 4 to transmit drilling power during insertion into a mud or other rheological formation, and preferably, the roller centralizer 72 also plays a supporting role.

Further, as shown in fig. 2, a suspension device 6 is connected between the inner tubular column 1 and the flexible outer tubular column 4, and the suspension device 6 is located at the upper portion of the inner tubular column 1, specifically, when the inner tubular column 1 is the rigid tubular column 112, the suspension device 6 includes a thrust bearing and a centering bearing 71, or a composite bearing having both centering and thrust functions, so that the inner tubular column 1 and the flexible outer tubular column 4 do not axially move relative to each other, and the inner tubular column 1 is not prevented from rotating inside the flexible outer tubular column 4.

Further, as shown in fig. 1, 2 and 3, the guiding device 2 is connected with a wellhead control end point through a jumper 9, a control end of the wellhead can issue a control command to the guiding device 2, and in addition, the control end of the wellhead can also transmit electric power to the guiding device 2 so as to avoid extra cost and power failure risks caused by underground power generation.

Further, as shown in fig. 1, 2 and 3, the guiding device 2 includes a transmission shaft 23, a bearing body 22 and a sleeve 21, which are sequentially sleeved from inside to outside, an upper end of the sleeve 21 is hinged to a lower end of the flexible outer tubular column 4, an upper end of the bearing body 22 is connected to a lower end of the inner tubular column 1, a lower end of the transmission shaft 23 is connected to the drill bit 3, an annular moving space is disposed between the transmission shaft 23 and the bearing body 22, a deflecting mechanism is disposed in the annular moving space, and the deflecting mechanism can drive the transmission shaft 23 and the bearing body 22 to move relatively so as to drive the drill bit 3 to deflect a preset angle in a preset direction, thereby changing a well track and further realizing a short build slope.

In an embodiment of the present invention, as shown in fig. 1 and fig. 2, the upper portion of the sleeve 21 is connected to the bearing body 22 through a first hinge structure 24, the deflection mechanism includes at least three sets of driving hydraulic cylinders 25 circumferentially spaced along the lower portion of the bearing body 22, preferably, the driving hydraulic cylinders 25 are uniformly arranged along the circumference of the bearing body 22, the driving hydraulic cylinders 25 include a piston structure accommodating cavity disposed in the outer wall of the bearing body 22 and a driving piston structure disposed in the piston structure accommodating cavity, and the driving piston structure can push the transmission shaft 23 and the bearing body 22 to move relatively, so that the drill bit 3 at the lower end of the bearing body 22 laterally cuts off the formation in a symmetrical orientation.

In another embodiment of the present invention, as shown in fig. 3, the deflecting mechanism includes an eccentric ring 26 and an electrically driven actuator 27, the electrically driven actuator 27 is disposed on the bearing body 22, the eccentric ring 26 is disposed between the transmission shaft 23 and the bearing body 22, a lower portion of the transmission shaft 23 is connected to the bearing body 22 through a second hinge structure 28, the electrically driven actuator 27 can drive the eccentric ring 26 to rotate, and rotation of the eccentric ring 26 can drive the transmission shaft 23 and the bearing body 22 to move relatively, specifically, the electrical actuator is a driving motor, the driving motor can drive the eccentric ring 26 to rotate, and rotation of the eccentric ring 26 can drive the transmission shaft 23 to swing around the second hinge structure 28 and/or rotate around the axis of the bearing body 22; a first righting structure 291 is arranged between the upper portion of the bearing body 22 and the sleeve 21, a second righting structure 292 is arranged between the lower portion of the bearing body 22 and the sleeve 21, the second hinge structure 28 is located between the first righting structure 291 and the second righting structure 292, and the first righting structure 291 and the second righting structure 292 can guarantee that the controllable flexible weight-on-bit torque transmission string and the well bore are always coaxial.

It should be noted that the specific working principle of the above-mentioned deflecting mechanism is the prior art, and is not described herein again, and of course, the deflecting mechanism may also adopt any other existing structure capable of driving the drill bit to deflect by a preset angle according to a preset direction.

In summary, the guide device is arranged in the double pipe, so that the drill bit can be driven by the guide device to deflect a preset angle in a preset direction under the rotating condition to change the track of the well hole, thereby realizing a short build-up rate; through the flexible outer tubular column, under the rotating condition, the torque for driving the drill bit to rotate can be well transmitted to the guiding device, and therefore the guided drilling with a certain well hole extension length is achieved.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications of the invention without departing from the spirit and principles of the invention should be considered within the scope of the invention. It should be noted that the components of the present invention are not limited to the above-mentioned whole application, and the technical features described in the present specification can be selected individually or in combination according to actual needs, so that the present invention naturally covers other combinations and specific applications related to the invention.

Claims

1. A duplex tube, comprising:

the lower end of the inner pipe column is connected with a guide device, the lower end of the guide device is connected with a drill bit, the guide device can drive the drill bit to deflect by a preset angle, and a through flow passage for circulation of a drilling circulation medium is arranged inside the inner pipe column;

2. The double pipe of claim 1,

the flexible outer tubular column comprises a plurality of outer connecting short sections which are sequentially hinged from top to bottom, two adjacent outer connecting short sections are connected through an outer hinge structure, and the outer connecting short sections positioned at the lowest part are connected with the guide device.

3. The double tube of claim 2,

a plurality of centralizing devices arranged at intervals are arranged between the flexible outer tubular column and the inner tubular column.

4. The double pipe of claim 3,

the righting device is a righting bearing or a roller centralizer.

5. The double pipe of claim 3,

the righting device is arranged between each external connection short section and the inner pipe column.

6. The double tube of claim 1,

the inner pipe column is a pressure-bearing hose or a rigid pipe column.

7. The double tube of claim 1,

and a suspension device is connected between the inner pipe column and the flexible outer pipe column and is positioned at the upper part of the inner pipe column.

8. The double pipe of claim 1,

the guiding device is connected with a wellhead control end point through a jumper wire.

9. The double tube according to any one of claims 1 to 8,

the guide device comprises a transmission shaft, a bearing body and a sleeve, wherein the transmission shaft, the bearing body and the sleeve are sequentially sleeved from inside to outside, the upper end of the sleeve is hinged with the lower end of the flexible outer pipe column, the upper end of the bearing body is connected with the lower end of the inner pipe column, the lower end of the transmission shaft is connected with the drill bit, an annular movable space is arranged between the transmission shaft and the bearing body, and a deflection mechanism is arranged in the annular movable space and can drive the transmission shaft and the bearing body to move relatively.

10. The double tube of claim 9,

the upper portion of the sleeve is connected with the bearing body through a first hinge structure, the deflection mechanism comprises at least three groups of driving hydraulic cylinders which are arranged along the circumferential direction of the lower portion of the bearing body at intervals, each driving hydraulic cylinder comprises a piston structure accommodating cavity arranged in the outer wall of the bearing body and a driving piston structure arranged in the piston structure accommodating cavity, and the driving piston structure can push the transmission shaft and the bearing body to move relatively.

11. The double tube of claim 9,

the deflection mechanism comprises an eccentric ring and an electric drive actuator, the electric drive actuator is arranged on the bearing body, the eccentric ring is arranged between the transmission shaft and the bearing body, the lower portion of the transmission shaft is connected with the bearing body through a second hinge structure, the electric drive actuator can drive the eccentric ring to rotate, the rotation of the eccentric ring can drive the transmission shaft and the bearing body to move relatively, a first righting structure is arranged between the upper portion of the bearing body and the sleeve, a second righting structure is arranged between the lower portion of the bearing body and the sleeve, and the second hinge structure is located between the first righting structure and the second righting structure.