CN111236834A - Self-balancing torque drilling method and device for coiled tubing - Google Patents
Self-balancing torque drilling method and device for coiled tubing Download PDFInfo
- Publication number
- CN111236834A CN111236834A CN201811442187.5A CN201811442187A CN111236834A CN 111236834 A CN111236834 A CN 111236834A CN 201811442187 A CN201811442187 A CN 201811442187A CN 111236834 A CN111236834 A CN 111236834A
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- Prior art keywords
- coiled tubing
- drilling
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- drill
- motor
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/16—Plural down-hole drives, e.g. for combined percussion and rotary drilling; Drives for multi-bit drilling units
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/28—Enlarging drilled holes, e.g. by counterboring
Abstract
The invention provides a self-balancing torque drilling method and a self-balancing torque drilling device for a coiled tubing, and relates to the field of petroleum and natural gas drilling and well completion. The self-balancing torque drilling method and device for the coiled tubing provided by the invention can reduce the reactive torque acting on the coiled tubing string in the drilling process and avoid buckling of the coiled tubing in the drilling process of the coiled tubing.
Description
Technical Field
The invention relates to the field of petroleum and natural gas drilling and completion, in particular to a self-balancing torque drilling method and device for a coiled tubing.
Background
The coiled tubing drilling technology is a main means for mining potential increase and storage of long-term shut-in wells and low-yield low-efficiency wells in the middle and later stages of development of many oil fields in China. The coiled tubing is adopted to replace the traditional drill pipe for well drilling operation, has the characteristics of high efficiency, small occupied area, low cost and convenient control of bottom hole pressure, combines the coiled tubing with underbalanced fluid, is convenient for realizing the technical advantages of continuous circulation and the like, can be widely used for lateral drilling of old wells, deepening of old wells and development of unconventional oil and gas reservoirs, can improve the recovery ratio of residual oil and gas, reduces operation risks and reduces the production cost of crude oil.
However, the coiled tubing is easy to buckle when bearing large torque, so that the conventional coiled tubing drilling operation cannot be performed at high drilling pressure and high torque as the conventional drill rod drilling operation. The conventional coiled tubing drilling operation generally adopts low bit pressure and high rotating speed operation, and the drilling efficiency is low.
In view of the above, the present inventors have designed a self-balancing torque drilling method and apparatus for coiled tubing through trial and error based on production design experience in and relating to the field for many years, in order to solve the problems of the prior art.
Disclosure of Invention
The invention aims to provide a self-balancing torque drilling method and device for a coiled tubing, which can reduce the reaction torque acting on a coiled tubing string in the drilling process and avoid buckling of the coiled tubing in the drilling process of the coiled tubing.
In order to achieve the above objects, the present invention provides a self-balancing torque drilling method for coiled tubing, wherein a connector, a drill pipe, a first drilling unit and a second drilling unit are sequentially connected in series at an end of the coiled tubing, and a rotation direction of the first drilling unit is opposite to a rotation direction of the second drilling unit.
The self-balancing torque drilling method for coiled tubing as described above, wherein the first drilling unit comprises a first drill bit and a first motor for driving the first drill bit, and the second drilling unit comprises a second drill bit and a second motor for driving the second drill bit, the first motor rotating in a direction opposite to the second motor.
The invention also provides a self-balancing torque drilling device for the coiled tubing, which is used for the self-balancing torque drilling method for the coiled tubing, wherein the self-balancing torque drilling device comprises the coiled tubing, a connector, a drill pipe, a first drilling unit and a second drilling unit which are sequentially connected in series, and the rotation direction of the first drilling unit is opposite to that of the second drilling unit so as to reduce the reactive torque acting on the coiled tubing during the drilling process.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the outer diameter of the first drilling unit is greater than the outer diameter of the second drilling unit.
The self-balancing torque drilling device for coiled tubing as described above, wherein the first motor is a right-handed screw drill and the second motor is a left-handed screw drill.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the first drill bit has a right-handed cutting configuration and the second drill bit has a left-handed cutting configuration, and the first motor is coupled to the drill pipe via a right-handed thread.
The self-balancing torque drilling device for coiled tubing as described above, wherein the first motor is a left-handed screw drill and the second motor is a right-handed screw drill.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the first drill bit has a left-handed cutting configuration, the second drill bit has a right-handed cutting configuration, and the first motor is coupled to the drill pipe via a left-handed thread.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the first drill bit is a reamer and the second drill bit is a pilot drill bit.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the rotational speed of the second drilling unit is greater than the rotational speed of the first drilling unit.
The self-balancing torque drilling apparatus for coiled tubing as described above, wherein the drill pipe is a weighted drill pipe.
The self-balancing torque drilling device for the coiled tubing comprises a connecting body, a connecting bushing and a plurality of fixing bolts, wherein the connecting body and the connecting bushing are cylindrical, the connecting bushing is arranged at one end of the connecting body and sleeved in the connecting body, an interval is formed between the outer wall of the connecting bushing and the inner wall of the connecting body, an annular mounting space is formed between the outer wall of the connecting bushing and the inner wall of the connecting body, the coiled tubing is inserted in the mounting space, a plurality of mounting holes communicated with the mounting space are formed in the outer wall of the connecting body, the fixing bolts are correspondingly inserted into the mounting holes and abut against the outer wall of the coiled tubing, the outer wall of the fixing bolts is in threaded fit with the inner wall of the mounting holes, and the other end of the connecting body is in threaded connection with the drill rod.
Compared with the prior art, the invention has the following characteristics and advantages:
according to the self-balancing torque well drilling method and device for the coiled tubing, the first drilling unit and the second drilling unit are used for simultaneously performing well drilling operation, and in the well drilling process, the rotating direction of the first drilling unit is opposite to that of the second drilling unit, so that the direction of the counter torque generated by the first drilling unit is opposite to that of the counter torque generated by the second drilling unit, and the counter torques can be mutually offset, the counter torque acting on a coiled tubing string in the well drilling process can be greatly reduced, and buckling of the coiled tubing in the high-bit-pressure and high-torque coiled tubing well drilling process is avoided.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.
FIG. 1 is a schematic structural view of a self-balancing torque drilling apparatus for coiled tubing according to the present invention;
fig. 2 is a schematic structural view of the connector of the present invention.
Description of reference numerals:
100. a self-balancing torque drilling device; 10. A coiled tubing;
20. a connector; 21. A connecting body;
22. connecting the bushing; 23. Fixing the bolt;
30. a drill stem; 40. A first drilling unit;
41. a first drill bit; 42. A first motor;
50. a second drilling unit; 51. A second drill bit;
52. a second motor; 24. And (7) installing holes.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
The present invention provides a self-balancing torque drilling method for coiled tubing, as shown in fig. 1, a connector 20, a drill rod 30, a first drilling unit 40 and a second drilling unit 50 are sequentially connected in series at the end of a coiled tubing 10, and the rotation direction of the first drilling unit 40 is opposite to the rotation direction of the second drilling unit 50.
The present invention also proposes a self-balancing torque drilling apparatus 100 for coiled tubing, the self-balancing torque drilling apparatus 100 comprising a coiled tubing 10, a connector 20, a drill rod 30, a first drilling unit 40 and a second drilling unit 50 connected in series in this order, the rotation direction of the first drilling unit 40 and the rotation direction of the second drilling unit 50 being opposite.
According to the self-balancing torque well drilling method and device for the coiled tubing, well drilling operation is carried out by utilizing the first drilling unit 40 and the second drilling unit 50 at the same time, and in the well drilling process, the rotating direction of the first drilling unit 40 is opposite to that of the second drilling unit 50, so that the reaction torque generated by the first drilling unit 40 is opposite to that generated by the second drilling unit 50, and can be counteracted with each other, the reaction torque acting on the coiled tubing string in the well drilling process can be greatly reduced, and buckling of the coiled tubing in the high-bit-pressure and high-torque coiled tubing well drilling process is avoided.
In an alternative example of the invention, the second drilling unit 50 is rotated at a higher speed than the first drilling unit 40, further ensuring efficient operation.
In an alternative example of the present invention, the first drilling unit 40 includes a first drill bit 41 and a first motor 42 for driving the first drill bit 41 to rotate, and the second drilling unit 50 includes a second drill bit 51 and a second motor 52 for driving the second drill bit 52 to rotate, and the first motor 42 rotates in a direction opposite to the second motor 52.
In an alternative example of the present invention, the first drill bit 41 is a reamer and the second drill bit 51 is a pilot bit.
Further, the first drill bit 41 may be a fixed wing reamer having a male thread formed at one end for connection to the first motor 42 and a female thread formed at the other end for connection to the second motor 52. Of course, the first bit 41 is not limited to being fixed to a reamer, and one skilled in the art may select other types of reamers that are available.
Further, the outer diameter of the first drill 41 is larger than that of the second drill 51, and preferably, the outer diameter of the first drill 41 is 120mm, and the outer diameter of the second drill 51 is 89 mm.
In an alternative example, as shown in FIG. 1, the first motor 42 is a right-hand auger, the first motor 42 has an outer diameter of 95mm and a rated rotational speed of 150 rpm; the second motor 52 is a left-hand screw drill, and the second motor 52 has an outer diameter of 73mm and a rated rotation speed of 150 rpm.
Preferably, the first drill 41 has a right-hand cutting configuration and the second drill 51 has a left-hand cutting configuration.
Preferably, first motor 42 is threadably coupled to drill rod 30 with a right-hand turn to ensure that first motor 42 is threadably coupled to drill rod 30 with sufficient security during drilling.
In the embodiment, as shown in fig. 1, during drilling, the first motor 42 drives the first drill bit 41 (reamer) to rotate right to break rock, so as to generate a left-handed reaction torque; the second motor 52 drives the second drill bit 51 (pilot drill bit) to rotate left to break rock, and a right-hand reaction torque is generated. The two reaction torques in opposite directions are mutually offset, so that the reaction torque on the coiled tubing string in the drilling process can be greatly reduced, and the buckling of the coiled tubing in the drilling process of the coiled tubing with high drilling pressure and high torque is avoided.
In another alternative example of the present invention, the first motor 42 is a left-hand screw drill and the second motor 52 is a right-hand screw drill.
Preferably, the first drill 41 has a left-handed cutting configuration and the second drill 51 has a right-handed cutting configuration.
Preferably, the first motor 42 is coupled to the drill rod 30 by left hand threads.
During drilling, the first motor 42 drives the first drill bit 41 (reamer) to rotate left to break rock, and a right-handed counter torque is generated; the second motor 52 drives the second drill bit 51 (pilot bit) to rotate rightwards to break the rock, and a left-handed counter torque is generated. The two reaction torques in opposite directions are mutually offset, so that the reaction torque on the coiled tubing string in the drilling process can be greatly reduced, and the buckling of the coiled tubing in the drilling process of the coiled tubing with high drilling pressure and high torque is avoided.
In an alternative example of the present invention, drill pipe 30 is a weighted drill pipe. The primary function of drill pipe 30 is to provide weight-on-bit for drilling, which is a key parameter in the achievement of a well. The weighted drill rod can bear larger drilling pressure, and further ensures the smooth operation of high drilling pressure and high torque drilling operation. The structure of the weighted drill rod can adopt the prior art and is not described in detail herein.
In an alternative example of the present invention, as shown in fig. 2, the connector 20 includes a connecting body 21, a connecting bush 22 and a plurality of fixing bolts 23, the connecting body 21 and the connecting bush 22 are both cylindrical, the connecting bush 22 is disposed at one end of the connecting body 21 and is sleeved in the connecting body 21, an annular mounting space is formed between an outer wall of the connecting bush 22 and an inner wall of the connecting body 21, the coiled tubing 10 is inserted into the mounting space, a plurality of mounting holes 24 communicated with the mounting space are formed in an outer wall of the connecting body 21, the fixing bolts 23 are correspondingly inserted into the mounting holes 24 and abut against an outer wall of the coiled tubing 10, an outer wall of the fixing bolt 23 is in threaded fit with an inner wall of the mounting hole 14, and the other end of the connecting body 21 is in threaded fit with the drill rod 30.
In an alternative example, the outer diameter of the connecting body 21 is 102mm, a plurality of mounting holes 24 are formed on the outer wall of one end of the connecting body 21, and a male thread capable of being connected to the drill rod 30 is formed on the other end of the connecting body 21. The outer wall of the connecting bush 22 is provided with a round concave; one end of the fixing bolt 23 is provided with an external thread, and the other end of the fixing bolt 23 is provided with a spherical bulge which can be abutted against the outer wall of the continuous pipe 10.
The self-balancing torque drilling method and apparatus for coiled tubing according to the present invention will now be described in detail using an 27/8 "coiled tubing drilling example:
first, a tool string is assembled at the wellhead: the second drill bit 51 is connected to the second motor 52 by a screw thread; the second motor 52 is screwed to the first drill 41; the first drill 41 is in threaded connection with a first motor 42; the first motor 42 is in threaded connection with the drill rod 30; the drill rod 30 is in threaded connection with the connecting body 21 of the connector 20; a connecting bush 22 is arranged in an inner hole of the continuous pipe 10 in advance and then inserted into the connecting body 21, a fixing bolt 23 is screwed into the mounting hole 24, and the continuous pipe 10 is radially extruded and fixed through the fixing bolt 23.
As shown in fig. 1, the first motor 42 is a right-handed screw drill, the first drill 41 is a reamer, the second motor 52 is a left-handed screw drill, and the second drill 51 is a pilot drill.
Then, the self-balancing torque drilling device 100 is put into a well and drilling is started, and in the drilling process, firstly, the first motor 42 drives the first drill bit 41 to rotate rightwards to break rock and generate a left-handed counter torque; forming a borehole in the ground after a period of drilling by the first drilling unit 40; then, the second drilling unit 50 is lowered into the hole, the second motor 52 drives the second drill bit 51 to rotate left, the second drill bit 51 acts on the inner wall of the hole to expand the inner diameter of the hole due to the fact that the outer diameter of the second drill bit 51 is larger than the outer diameter of the first drill bit 41, and rock breaking is performed by the left-handed rotation of the second drill bit 51, so that a right-handed counter torque is generated. The two reaction torques in opposite directions are mutually offset, so that the reaction torque on the coiled tubing string in the drilling process can be greatly reduced, and the buckling of the coiled tubing in the drilling process of the coiled tubing with high drilling pressure and high torque is avoided.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (12)
1. A self-balancing torque drilling method for coiled tubing is characterized in that a connector, a drill rod, a first drilling unit and a second drilling unit are sequentially connected in series at the tail end of the coiled tubing, and the rotation direction of the first drilling unit is opposite to that of the second drilling unit so as to reduce reactive torque acting on the coiled tubing during drilling.
2. The method of self-balancing torque drilling for coiled tubing of claim 1, wherein the first drilling unit has an outer diameter greater than an outer diameter of the second drilling unit.
3. A self-balancing torque drilling apparatus for coiled tubing for use in the self-balancing torque drilling method for coiled tubing of claim 1 or 2, wherein the self-balancing torque drilling apparatus comprises a coiled tubing, a connector, a drill pipe, a first drilling unit and a second drilling unit connected in series in that order, the direction of rotation of the first drilling unit and the direction of rotation of the second drilling unit being opposite.
4. The self-balancing torque drilling apparatus for coiled tubing of claim 3, wherein the first drilling unit comprises a first drill bit and a first motor for driving the first drill bit, and the second drilling unit comprises a second drill bit and a second motor for driving the second drill bit, the first motor rotating in a direction opposite to the second motor.
5. The self-balancing torque drilling apparatus for coiled tubing of claim 4, wherein the first motor is a right-handed screw drill and the second motor is a left-handed screw drill.
6. The self-balancing torque drilling apparatus for coiled tubing of claim 5, wherein the first drill bit has a right-handed cutting configuration and the second drill bit has a left-handed cutting configuration, the first motor being coupled to the drill pipe via right-handed threads.
7. The self-balancing torque drilling apparatus for coiled tubing of claim 4, wherein the first motor is a left-hand screw drill and the second motor is a right-hand screw drill.
8. The self-balancing torque drilling apparatus for coiled tubing of claim 7, wherein the first drill bit has a left-handed cutting configuration and the second drill bit has a right-handed cutting configuration, the first motor being coupled to the drill pipe via left-handed threads.
9. The self-balancing torque drilling apparatus for coiled tubing of claim 4, wherein the first drill bit is a reamer and the second drill bit is a pilot drill bit.
10. The self-balancing torque drilling apparatus for coiled tubing of claim 3, wherein the rotational speed of the second drilling unit is greater than the rotational speed of the first drilling unit.
11. The self-balancing torque drilling apparatus for coiled tubing of claim 3, wherein the drill pipe is a weighted drill pipe.
12. The self-balancing torque drilling apparatus for coiled tubing of claim 3, the connector comprises a connecting body, a connecting bush and a plurality of fixing bolts, wherein the connecting body and the connecting bush are cylindrical, the connecting bushing is arranged at one end of the connecting body and sleeved in the connecting body, a space is arranged between the outer wall of the connecting bushing and the inner wall of the connecting body, and an annular mounting space is formed, the continuous pipe is inserted in the installation space, a plurality of installation holes communicated with the installation space are arranged on the outer wall of the connecting body, the fixing bolt is correspondingly inserted into the mounting hole and abuts against the outer wall of the continuous pipe, the outer wall of the fixing bolt is in threaded fit with the inner wall of the mounting hole, and the other end of the connecting body is in threaded connection with the drill rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811442187.5A CN111236834A (en) | 2018-11-29 | 2018-11-29 | Self-balancing torque drilling method and device for coiled tubing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811442187.5A CN111236834A (en) | 2018-11-29 | 2018-11-29 | Self-balancing torque drilling method and device for coiled tubing |
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|---|---|
| CN111236834A true CN111236834A (en) | 2020-06-05 |
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| CN201811442187.5A Pending CN111236834A (en) | 2018-11-29 | 2018-11-29 | Self-balancing torque drilling method and device for coiled tubing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943112A (en) * | 2021-03-08 | 2021-06-11 | 苗芷芃 | Anti-torque balancing device for petroleum drilling coiled tubing and use method thereof |
-
2018
- 2018-11-29 CN CN201811442187.5A patent/CN111236834A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112943112A (en) * | 2021-03-08 | 2021-06-11 | 苗芷芃 | Anti-torque balancing device for petroleum drilling coiled tubing and use method thereof |
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