Drill rod

Abstract

The drill rod comprises a middle drill rod body, an upper connector and a lower connector, the upper connector and the lower connector are fixed to the two ends of the middle drill rod body, the upper connector is a hollow pipe body and sleeved with a first coupling and a second coupling which are arranged at a preset interval, and the lower connector is a hollow pipe body and sleeved with a third coupling; the free end of the upper connector is provided with a first connecting part, and the free end of the lower connector is provided with a second connecting part matched with the first connecting part. The drill rod disclosed by the utility model can be suitable for an ultra-deep well, has the advantages of being convenient to sit and clamp, high in drilling tool protectiveness, capable of improving the production time efficiency and capable of meeting on-site complex operation, not only can protect a wellhead drilling tool body, but also can achieve the purpose of optimal and fast drilling, so that the wellhead drill rod can sit on an elevator, a top drive screw thread can be directly disassembled, and a drill bit is far away from the well bottom.

Description

Technical Field

[0001] The utility model relates to the technical field of oil drilling equipment, and more specifically, to a drill rod. Background Art

[0002] With the continuous development of the oil industry, oil and gas reservoirs are gradually advancing to deep layers and deep seas, facing difficulties such as multiple layers, ultra-deep well depth, ultra-high temperature and ultra-high pressure, high difficulty in well control, large wellbore size, and heavy overhang of drill string. The continuous increase in the overhang of drill string has led to increasingly stringent requirements for drill pipes. In the early drilling construction process, there were defects when using the top drive device. The column drilling method was adopted. The whole column was drilled. After drilling the column, the eye was raised and the drill tool was lowered to the wellhead. The drill pipe slip was seated for seating, and then the top drive buckle was removed. The drill tool was lifted to remove the slip, and the pump was turned on to start the top drive to continue drilling. This method has certain risks and causes certain damage to the drill. During the column connection process, the suspended weight of the drilling tool in the well will be hung on the wellhead drill pipe slips, and the drilling tool will be clamped by multiple slip teeth embedded in the drill pipe body. As the wellbore continues to deepen, the suspended weight will continue to increase. The greater the clamping force of the slips, the deeper the depth of the slip teeth embedded in the drill tool teeth will continue to increase, and the position of the drill tool is basically fixed, which will cause permanent damage to the drill tool body and reduce its tensile strength. Now there are more and more ultra-deep wells, and some wells have exceeded 8,000 meters, and the deepest well can reach 9,300 meters. In this case, the requirements for the strength and management of the drilling tools entering the well are getting higher and higher. At present, there is no effective ultra-deep well drilling construction method. In the current method, the drill pipe slips are used to clamp the thickened part of the drill pipe, and the extrusion force of the slip teeth is used to complete the suspension of the drilling tool in the well, and then the wellhead operation is completed. Under the condition of small tonnage of suspended weight, the damage to the drilling tool is relatively small. Once the suspended weight of the drilling tool exceeds 120t, the slip teeth will cause greater damage to the thickened part of the drilling tool. In order to protect the drilling tools, the deep well section does not allow the use of drill pipe slips, but requires the use of drill pipe elevators. However, due to the height restrictions of the top drive lower end clamp and the bell mouth, the existing drill pipe coupling directly sits on the elevator, which cannot meet the top drive buckle operation, and can only be connected in double roots. That is, during drilling, after drilling a column, a single root elevator is lifted up, the top drive buckle and the first single root buckle are removed, and after the single root is thrown off, another column is connected to continue drilling. Therefore, the existing technology can improve the production time efficiency in the shallow well section, but it has certain damage to the drill. In the deep well section, the production process is increased, the production time efficiency of the wellhead is reduced, the static time of the wellhead is increased, and the risk of drill stuck underground is increased. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a drill pipe which can be suitable for ultra-deep wells and has the advantages of convenient clamping, high protection for drilling tools, improved production efficiency and satisfaction of complex on-site operations. It can not only protect the wellhead drilling tool body, but also achieve the purpose of fast drilling, so that the wellhead drill pipe can be clamped, the top drive thread can be directly disassembled and the drill bit is away from the bottom of the well.

[0004] The utility model provides a drill rod, comprising an intermediate drill rod body and an upper joint and a lower joint fixed at both ends thereof, wherein the upper joint is a hollow tube body and is externally sleeved with a first coupling and a second coupling with preset intervals, the lower joint is a hollow tube body and is externally sleeved with a third coupling, the free end of the upper joint has a first connecting portion, and the free end of the lower joint has a second connecting portion matching the first connecting portion.

[0005] Preferably, in the above-mentioned drill pipe, the lower ends of the first coupling and the second coupling both have shoulder surfaces matching the load-bearing inclined surfaces of the elevators; and the upper ends of the second coupling and the third coupling have shoulder transition surfaces.

[0006] Preferably, in the above-mentioned drill rod, the outer diameters of the first coupling and the second coupling are equal, and the slope angles between the shoulder surface at the lower end of the first coupling, the shoulder surface at the lower end of the second coupling and the side surface of the upper joint are both in the range of 17° to 19°.

[0007] Preferably, in the above-mentioned drill pipe, the slope angle range between the shoulder transition surface at the upper end of the second coupling and the side surface of the upper joint is 23° to 30°, and the slope angle range between the shoulder transition surface at the upper end of the third coupling and the side surface of the lower joint is 23° to 30°.

[0008] Preferably, in the above-mentioned drill rod, the diameter of the through hole in the upper joint and the diameter of the through hole in the lower joint are both 2 mm to 3 mm smaller than the diameter of the through hole in the intermediate drill rod body, and the through hole in the upper joint and the through hole in the intermediate drill rod body transition smoothly, and the through hole in the lower joint and the through hole in the intermediate drill rod body transition smoothly.

[0009] Preferably, in the above-mentioned drill rod, the outer diameter of the upper joint is equal to the outer diameter of the lower joint, and both are 2 mm to 3 mm larger than the outer diameter of the middle drill rod body.

[0010] Preferably, in the above-mentioned drill rod, the first connecting portion is an internal thread, and the second connecting portion is an external thread.

[0011] Preferably, in the above-mentioned drill rod, the upper joint and the intermediate drill rod body are fixed by friction welding, and the lower joint and the intermediate drill rod body are fixed by friction welding.

[0012] Preferably, in the above drill pipe, a preset interval between the first coupling and the second coupling is 0.5 m to 0.8 m.

[0013] Preferably, in the above-mentioned drill pipe, the intrinsic length of the first coupling is 15 cm to 25 cm greater than the intrinsic length of the second coupling.

[0014] It can be seen from the above technical scheme that the above drill rod provided by the utility model includes an intermediate drill rod body and an upper joint and a lower joint fixed at both ends thereof, wherein the upper joint is a hollow tube body and is externally sleeved with a first coupling and a second coupling with a preset interval, the lower joint is a hollow tube body and is externally sleeved with a third coupling, the free end of the upper joint has a first connecting portion, and the free end of the lower joint has a second connecting portion matching the first connecting portion. It can be seen that the upper joint has two couplings on the outside, so it can be connected to the drill rod by directly sitting on the second coupling of the upper joint. The shoulder surface between the rod bodies can directly perform the top drive make-up and make-down operations, which can avoid damage to the drill rod body during the column connection process, especially the problem that the top drive cannot be connected normally after the wellhead is hung during the drilling process, and only a single rod or column can be connected to the top drive. Therefore, the drill rod can be suitable for ultra-deep wells, has the advantages of convenient hanging, high protection for drilling tools, improved production efficiency and meeting complex on-site operations, which can not only protect the wellhead drilling tool body, but also achieve the purpose of fast drilling, so that the wellhead drill rod can be hung, the top drive thread can be directly disassembled and the drill bit is far away from the bottom of the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0016] Figure 1 This is a schematic diagram of an embodiment of a drill rod provided by the utility model. DETAILED DESCRIPTION

[0017] The core of the utility model is to provide a drill rod which can be suitable for ultra-deep wells and has the advantages of convenient clamping, high protection for drilling tools, improved production efficiency and satisfaction of complex on-site operations. It can not only protect the wellhead drilling tool body, but also achieve the purpose of fast drilling, so that the wellhead drill rod can be clamped, the top drive thread can be directly disassembled and the drill bit is far away from the bottom of the well.

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] The utility model provides a drill rod implementation example Figure 1 As shown, Figure 1 The present invention provides a schematic diagram of an embodiment of a drill rod, the drill rod may include an intermediate drill rod body 1 and an upper joint 2 and a lower joint 3 fixed at both ends thereof, the upper joint 2 and the intermediate drill rod body 1 may be fixed by, but not limited to, welding, the lower joint 3 and the intermediate drill rod body 1 may also be fixed by, but not limited to, welding, wherein the upper joint 2 is a hollow tube and is externally sleeved with a first coupling hoop 4 and a second coupling hoop 5 with a preset interval, the preset interval may be selected according to actual needs, as long as the functional needs are met, it can be seen that the focus of the scheme is that the upper joint 2 has one more coupling hoop than the prior art, so that there are two positions for hanging the weight and placing the hanging card, which is more convenient for the hanging card operation, and there is no need to fix the drill rod by a slip method that damages the drill rod, and the lower joint 3 is a hollow tube and is externally sleeved with a third coupling hoop 6, so There is a margin on the diameter, so that the requirements of connection strength and repair can be met. The free end of the upper joint 2 has a first connecting part 7, and the free end of the lower joint 3 has a second connecting part 8 matching the first connecting part 7. The first connecting part 7 and the second connecting part can be used to connect and fix the two drill pipes in the vertical direction. That is to say, the first connecting part 7 of the drill pipe at the lower part can be connected and fixed with the second connecting part 8 of the drill pipe at the upper part, so as to fix the two drill pipes together. As long as the two connecting parts can match each other, the specific method adopted is not limited. The first connecting part can preferably be an internal thread, and the second connecting part can preferably be an external thread. The two need to be processed into the same type of thread so that the internal and external thread threads can fit in place and meet the tensile strength and sealing effect after tightening. In this way, the connection through the internal thread at the top of the upper joint and the external thread at the bottom of the lower joint can meet the increasing depth of the wellbore.

[0020] It can be seen from the above technical scheme that in the embodiment of the above drill pipe provided by the utility model, since it includes an intermediate drill pipe body and an upper joint and a lower joint fixed at both ends thereof, wherein the upper joint is a hollow tube body and the outer sleeve is provided with a first coupling and a second coupling with a preset interval, the lower joint is a hollow tube body and the outer sleeve is provided with a third coupling, the free end of the upper joint has a first connecting portion, and the free end of the lower joint has a second connecting portion matching the first connecting portion. It can be seen that the outer portion of the upper joint has two couplings, so the second coupling of the upper joint can be directly connected to the drill pipe body by hanging the second coupling of the upper joint. The shoulder surface between the top drive and the top drive can be directly connected and broken out by the top drive, which can avoid damage to the drill pipe body during the column connection process, especially the problem that the top drive cannot be connected normally after the wellhead is hung during the drilling process, and only a single root or column can be connected to the top drive. Therefore, the drill pipe can be suitable for ultra-deep wells, has the advantages of convenient hanging, high protection for drilling tools, improved production efficiency and meeting complex on-site operations, which can not only protect the wellhead drilling tool body, but also achieve the purpose of fast drilling, so that the wellhead drill pipe can be hung and the top drive thread can be directly disassembled, and the drill bit is far away from the bottom of the well.

[0021] In a specific embodiment of the above drill rod, continue to refer to Figure 1 The lower ends of the first coupling 4 and the second coupling 5 both have shoulder surfaces 9 and 10 that match the load-bearing slope of the elevator, so that they can ensure close contact with the elevator; and the upper ends of the second coupling 5 and the third coupling 6 can have shoulder transition surfaces 11 and 12, so that the occurrence of stress concentration problems can be avoided. Further, the outer diameters of the first coupling 4 and the second coupling 5 are preferably equal, and they can also be preferably equal to the outer diameter of the third coupling 6, so as to ensure that the upper and lower joints are buckled continuously, and the couplings are evenly stressed, and the slope angle range between the shoulder surface 9 at the lower end of the first coupling 4 and the shoulder surface 10 at the lower end of the second coupling 5 and the side surface of the upper joint 2 can be preferably 17° to 19°, and further preferably 18°, so that it can be closely fitted with the existing 18° slope elevator load-bearing slope, and of course, the slope angle can also be adaptively adjusted according to elevators with different slopes.

[0022] In another specific embodiment of the above-mentioned drill pipe, the slope angle range between the shoulder transition surface 11 at the upper end of the second coupling and the side surface of the upper joint 2 can preferably be 23° to 30°, and the slope angle range between the shoulder transition surface 12 at the upper end of the third coupling 6 and the side surface of the lower joint 3 can preferably be 23° to 30°. It should be noted that this slope angle can avoid the problem of stress concentration at the diameter change point.

[0023] In another specific embodiment of the drill rod, the diameter of the through hole 201 in the upper joint 2 and the diameter of the through hole 301 in the lower joint 3 are 2mm to 3mm smaller than the diameter of the through hole 101 in the middle drill rod body 1, so as to ensure that the service life of the upper and lower joints is longer, and the through hole in the upper joint 2 and the through hole in the middle drill rod body 1 are smoothly transitioned, and the through hole in the lower joint 3 and the through hole in the middle drill rod body 1 are smoothly transitioned, so that the force is more uniform, and there will be no excessive force at a certain position and breakage. Further, the outer diameter of the upper joint 2 and the outer diameter of the lower joint 3 are preferably equal, and both are preferably 2mm to 3mm larger than the outer diameter of the middle drill rod body 1, so that the wall thickness of the upper joint and the lower joint is greater than the wall thickness of the middle drill rod body, which is manifested as thickening inside and outside, so as to ensure that the tonnage requirements of the sitting and hanging drilling tools are met, and the service life of the upper and lower joints is longer. Of course, it can also be adjusted to be larger according to the actual tonnage requirements, which is not limited here.

[0024] In a preferred embodiment of the above-mentioned drill rod, the upper joint 2 and the middle drill rod body 1 are preferably fixed by friction welding, and the lower joint 3 and the middle drill rod body 1 are preferably fixed by friction welding, which can ensure a more secure connection. Of course, other fixing methods can also be selected according to actual needs, which is not limited here.

[0025] In another preferred embodiment of the drill pipe, the preset interval between the first coupling 4 and the second coupling 5 can be preferably 0.5m to 0.8m, and this distance requirement is greater than the drill pipe elevator used. This preferred interval can meet the requirements of hanging the drill pipe elevator. Further, the length of the first coupling 4 itself can be preferably 15cm to 25cm greater than the length of the second coupling 5 itself. This is because the length of the first coupling 4 itself must not only meet the needs of hanging, but also meet the size of the internal thread processing and the distance of the later repair, while the height of the second coupling 5 only needs to meet the needs of hanging. After the second coupling 5 is hung, the height can meet the requirements of connecting the top drive, and can also be connected to the drill tool for drilling. It can be further preferably 20cm, so that the height of the top of the drill pipe after hanging can be reduced to the turntable surface, which is convenient for the wellhead drill pipe and the square drill pipe to be connected and buckled, and can achieve the purpose of repairing.

[0026] By using the above-mentioned drill pipe, when using the top drive to drill or reaming the column on site, after drilling the column, the drill tool is lifted up and directly sits on the shoulder surface under the second coupling of the upper joint, and the drill tool is suspended and hung on the shoulder surface between the second coupling and the middle drill pipe body. On the one hand, the drill bit can be kept away from the bottom of the well, and on the other hand, the top drive can be directly connected and disconnected. During the process of pulling out and drilling, the drill tool can be directly connected and disconnected by sitting on the shoulder surface under the first coupling of the upper joint, and the drill tool is suspended and hung on the shoulder surface between the first coupling and the middle drill pipe body. When the underground is complex, the drill bit can be kept away from the complex layer at the bottom of the well by directly sitting on the shoulder surface under the second coupling of the upper joint, reducing the safety risk at the bottom of the well, and can easily connect and disconnect. This operation can effectively avoid damage to the drill tool, reduce the time for connecting and unloading the top drive of the drill tool, connect the column to improve the safety of the drill tool and production timeliness, and can connect and unload the top drive at any time to deal with abnormalities underground, improve the ability to handle on-site abnormalities, quickly achieve wellhead integrity, improve on-site safety, keep the drill bit away from the bottom of the well to prevent sticking, and ensure safe operation at the wellhead, effectively prevent the wellhead drill tool from falling into the well, avoid the risk of the drill tool falling into the well due to the jar in the drill tool assembly, and flexibly sit on the elevator during tripping and drilling, and connect the top drive at any time to drill and clean the sand.

[0027] In summary, the use of the above-mentioned drill pipe can not only solve the damage to the drill pipe body in the connection column in the prior art, but also solve the problem that the top drive cannot be normally connected after the wellhead is directly seated and hung. When using the top drive to drill or reaming the column, after drilling the entire column, the hanging card can be directly seated on the shoulder surface of the second coupling of the upper joint to bear the hanging weight of the drill string in the well, and the wellhead can directly perform the top drive buckle operation; in the drilling and lowering operation, the hanging card can be directly seated on the shoulder surface of the first coupling of the upper joint to bear the hanging weight of the drill string in the well. , directly carry out the operation of making and breaking the buckle. Once the downhole is complicated, the drill bit can be lifted up and the hanging card can be placed on the shoulder surface of the second coupling of the upper joint, connected to the top drive and directly buckled, and the pump can be immediately turned on for circulation treatment, which makes making and breaking the buckle convenient, and directly connecting the column improves production efficiency. The drill bit is far away from the bottom of the well, which reduces the static time of the drill bit at the bottom of the well, effectively prevents sticking, improves the safety of the downhole drill bit, and avoids the risk of the drill bit falling into the well by the jar in the drill bit assembly. The hanging card can be flexibly placed during the drilling, and the top drive can be connected at any time to clear the sand. The above-mentioned drill rod solves the problem of permanent damage to the drill bit by connecting the column on site, and can be connected to the top drive for circulation treatment at any time when the downhole is abnormal. It is scientific and practical, simple in structure, easy to operate, and easy to promote and use on a large scale.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A drill pipe, characterized in that: It includes an intermediate drill pipe body and an upper joint and a lower joint fixed at both ends thereof, wherein the upper joint is a hollow tube body and is externally sleeved with a first coupling and a second coupling with preset intervals, the lower joint is a hollow tube body and is externally sleeved with a third coupling, the free end of the upper joint has a first connecting portion, and the free end of the lower joint has a second connecting portion matching the first connecting portion.

2. The drill pipe according to claim 1, characterized in that: The lower ends of the first coupling and the second coupling both have shoulder surfaces matching the load-bearing inclined surfaces of the elevators; the upper ends of the second coupling and the third coupling have shoulder transition surfaces.

3. The drill pipe according to claim 2, characterized in that: The outer diameters of the first coupling and the second coupling are equal, and the slope angles between the shoulder surface at the lower end of the first coupling, the shoulder surface at the lower end of the second coupling and the side surface of the upper joint are both in the range of 17° to 19°.

4. The drill pipe according to claim 2, characterized in that: The slope angle between the shoulder transition surface at the upper end of the second coupling and the side surface of the upper joint is in the range of 23° to 30°, and the slope angle between the shoulder transition surface at the upper end of the third coupling and the side surface of the lower joint is in the range of 23° to 30°.

5. The drill pipe according to claim 1, characterized in that: The diameter of the through hole in the upper joint and the diameter of the through hole in the lower joint are both 2mm to 3mm smaller than the diameter of the through hole in the intermediate drill rod body, and the through hole in the upper joint and the through hole in the intermediate drill rod body are smoothly transitioned, and the through hole in the lower joint and the through hole in the intermediate drill rod body are smoothly transitioned.

6. The drill pipe according to claim 5, characterized in that The outer diameter of the upper joint is equal to the outer diameter of the lower joint, and both are 2 mm to 3 mm larger than the outer diameter of the middle drill pipe body.

7. The drill pipe according to claim 1, characterized in that The first connection portion is an internal thread, and the second connection portion is an external thread.

8. The drill pipe according to claim 1, characterized in that The upper joint and the middle drill pipe body are fixed by friction welding, and the lower joint and the middle drill pipe body are fixed by friction welding.

9. The drill pipe according to claim 1, characterized in that The preset interval between the first coupling and the second coupling is 0.5 m to 0.8 m.

10. The drill pipe according to any one of claims 1 to 9, characterized in that: The intrinsic length of the first coupling is 15 cm to 25 cm greater than the intrinsic length of the second coupling.

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