Petroleum exploration drill rod

Abstract

The invention relates to the technical field of petroleum drill rods, and discloses a petroleum exploration drill rod which comprises a hollow rod body, internal threads are arranged at the upper end of the rod body, and external threads matched with the internal threads are arranged at the lower end of the rod body; a grabbing cage is arranged on the inner side of the lower end of the rod body, a lifting column sliding in the axial direction is arranged on the inner side of the upper end of the rod body, the upper end of the lifting column is rotationally connected with a grabbing assembly, and the grabbing assembly comprises a plurality of angle-adjustable grabbing hooks for grabbing the grabbing cage. A traction rope is connected between the grabbing cage and the lifting column; an elastic telescopic piece is arranged in the middle of the traction rope; the drill rod threaded connector is prevented from being separated and falling off, and the drill rod can also be prevented from being broken and falling off; in a normal state, the grabbing cage and the grabbing assembly are located on the inner side of the rod body, regular appearance of the rod body is guaranteed, and entering and exiting of drill rods from fingerboards and storage are not affected. And compared with a bolt reinforcing structure, operation is more convenient, and the influence on drill rod assembling and disassembling work is small.

Description

Technical Field

[0001] The invention relates to the technical field of oil drill pipes, in particular to an oil exploration drill pipe. Background Art

[0002] Oil exploration drill pipe is an important tool for oil drilling. It is a steel pipe with threads at the end. It mainly plays the role of transmitting torque, conveying drilling fluid and supporting drill bits. During the oil drilling process, the drill pipe needs to withstand huge tension, torsion and pressure. Therefore, during the use of oil drill pipe, there is a risk of falling off and breaking at the threaded connection of the joint and in the middle. Due to the limitations of geological conditions, the depth of oil drilling can reach thousands of meters or even tens of thousands of meters. If the connection of one end of the drill pipe falls off or the drill pipe body falls off, it will cause serious losses.

[0003] In the prior art, the oil drill pipe with the invention patent publication number CN111379527B reduces the possibility of slippage after the two oil drill pipes are connected by staggering the limit blocks and the limit grooves, thereby improving the stability of the connection. However, the drill pipe can only reduce the possibility of slippage. Once the threaded connection structure of the drill pipe is disengaged, since the drill pipe is not in a vertical state, during the process of lifting the drill pipe, once the limit blocks and the limit grooves are aligned, the drill pipe will be disengaged. Another example is the utility model patent with publication number CN214403459U, which is a hydraulic ring geological drilling drill rod structure with anti-slip, and the drill rod structure has a bolt connection structure. Since the drill rod needs to be frequently assembled and unassembled, the bolt connection structure makes the assembly and unassembly process of the drill rod more complicated, and when the drill rod is placed, the bolts extend to the outside of the drill rod body, affecting the integrity and mobile storage of the drill rod; the utility model patent with publication number CN210127830U is a hydraulic ring geological drilling aluminum alloy drill rod; in the above-mentioned prior art, the first two can only reduce the risk of joints falling off, and the latter can only prevent the risk of the middle part of the rod body breaking and falling off; Summary of the invention

[0004] The purpose of the present invention is to provide a petroleum exploration drill pipe in order to solve the above-mentioned problems in the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions: A petroleum exploration drill pipe comprises a hollow rod body, an internal thread is arranged at the upper end of the rod body, and an external thread matching the internal thread is arranged at the lower end of the rod body; a grab cage is arranged on the inner side of the lower end of the rod body, an axially sliding lifting column is arranged on the inner side of the upper end of the rod body, a grab assembly is rotatably connected to the upper end of the lifting column, and the grab assembly comprises a plurality of angle-adjustable grab hooks for grabbing the grab cage; a traction rope is connected between the grab cage and the lifting column, and an elastic telescopic part is arranged in the middle of the traction rope.

[0006] Furthermore, a fixing frame is provided at the lower end of the rod body, and the traction rope and the grab cage are respectively connected to the upper side and the lower side of the fixing frame.

[0007] Furthermore, the grab cage is a spherical shell frame structure; the grab cage includes a bottom ring, a plurality of arc-shaped rods are connected to the circumference of the upper side of the bottom ring, a reinforcement ring is provided in the middle of the arc-shaped rods, and the reinforcement ring is parallel to the bottom ring.

[0008] Furthermore, the traction rope is divided into two sections, and the elastic telescopic part is connected between the two sections of the traction rope. The elastic telescopic part is a tension spring, which causes the lifting column to slide downward and causes the grabbing assembly to be located on the inner side of the end of the rod body; a plurality of auxiliary ropes are also connected between the two sections of the traction rope, and the auxiliary ropes are evenly distributed around the circumference, and the length of the auxiliary ropes is not less than the maximum stretching length of the tension spring.

[0009] Furthermore, the traction rope and auxiliary rope are both steel wire ropes.

[0010] Furthermore, a core frame is provided at the upper end of the rod body, and a lifting column slides through the middle of the core frame, and the cross-sectional shape of the lifting column is an I-shape; a rotating support for supporting the rotation of the grabbing assembly is provided at the upper end of the lifting column.

[0011] Furthermore, the grabbing assembly includes a column, the cross-section of the column is an I-shaped column, and the lower end of the column is rotatably connected to the lifting column; an annular frame is connected to the outer side of the column, and a plurality of grabbing hooks are evenly arranged along the annular frame, and the grabbing hooks are rotatably connected to the annular frame.

[0012] Furthermore, the grab hook includes a U-shaped hook portion and a straight rod section connected to one end of the U-shaped hook portion, the end of the straight rod section is rotatably connected to the annular frame, the U-shaped hook portion faces the inner ring side, and the U-shaped hook portion extends into the inner side of the lower part of the grab cage to grab the grab cage.

[0013] Furthermore, a vertically lifting lifting cylinder is provided on the sliding sleeve on the outer side of the column, and a spring is connected between the lifting cylinder and the upper end of the column, so that the lifting cylinder is located at the lower part of the column; gears are provided at the rotation connection between the grab hook and the annular frame, and the gears are rotationally connected to the annular frame, and a plurality of vertical racks cooperating with the gears are provided on the outer side of the lifting cylinder; vertical strip holes are provided on the lifting cylinder between the racks, and the annular frame is connected to the middle part of the column through the strip holes.

[0014] Furthermore, handles are provided on both sides of the lower end of the lifting cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention prevents the drill pipe threaded joint from separating and falling off, and can also prevent the drill pipe from breaking and falling off; under normal circumstances, the grab cage and the grab assembly are located inside the rod body, ensuring that the appearance of the rod body is regular and does not affect the drill pipe from entering and exiting the finger beam and being stored; the grab hook is coordinated with the grab cage by rotating the grab hook, and the relative bolt-reinforced structure makes the loading and unloading buckle operation more convenient, with little impact on the drilling rod loading and unloading buckle work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1It is a schematic diagram of the cross-sectional structure of the present invention.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of the upper end.

[0018] Figure 3 It is a schematic diagram of the internal structure of the present invention.

[0019] Figure 4 for Figure 3 Schematic diagram of the upper structure.

[0020] Figure 5 for Figure 3 Schematic diagram of the central structure.

[0021] Figure 6 for Figure 3 Schematic diagram of the lower structure.

[0022] Figure 7 It is a schematic diagram of the side structure of the grabbing assembly of the present invention.

[0023] Figure 8 It is a schematic diagram of the three-dimensional structure of the grabbing assembly of the present invention from the first perspective.

[0024] Fig. 9 It is a schematic diagram of the stereoscopic structure of the grabbing assembly of the present invention from a second viewing angle.

[0025] Fig.10 It is a schematic diagram of the external structure of the present invention.

[0026] In the figure: 1, rod body; 2, grab cage; 3, lifting column; 4, grab assembly; 5, traction rope; 6, elastic telescopic member; 7, auxiliary rope; 8, fixed frame; 9, core frame; 10, rotating support; 21. bottom ring; 22. arc rod; 23. reinforcement ring; 41. Column; 42. Lifting cylinder; 421. Rack; 422. Strip hole; 43. Spring; 44. Handle; 45. Ring frame; 46. Gear; 47. Grab hook. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0028] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" that may appear should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "provided with" that may appear should be understood in a broad sense. For example, the object "provided with" may be a part of the body, or may be arranged separately from the body and connected to the body, and the connection may be a detachable connection or an inseparable connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The specific embodiment of the oil exploration drill pipe provided by the present invention is as follows: See also Figure 1-10 The oil exploration drill pipe includes a hollow rod body 1, an internal thread is arranged at the upper end of the rod body 1, and an external thread matching the internal thread is arranged at the lower end of the rod body 1; the threads at the upper and lower ends of the rod body 1 are mutually matching conical threads, which are connected to each other to transmit torque, and the interior of the hollow rod body 1 can be used to transport drilling fluid.

[0032] A gripping cage 2 is provided inside the lower end of the rod body 1. Specifically, a fixing frame 8 is provided at the lower end of the rod body 1. The fixing frame 8 has a plurality of vertical through holes for drilling fluid to pass through. The gripping cage 2 is connected to the lower middle side of the fixing frame 8. The gripping cage 2 is located inside the rod body 1 and corresponds to the position of the external thread.

[0033] The grab cage 2 is a spherical shell frame structure; the grab cage 2 includes a bottom ring 21, and a plurality of arc rods 22 are connected to the upper circumference of the bottom ring 21. A reinforcement ring 23 is provided in the middle of the arc rod 22, and the reinforcement ring 23 is parallel to the bottom ring 21; the diameter of the reinforcement ring 23 is larger than the bottom ring 21, and a hole for hanging is formed between the reinforcement ring 23, the bottom ring 21 and the arc rod 22, and the hole is inclined downward to facilitate the entry of the hanging structure. In this embodiment, the number of the arc rods 22 is eight, and eight holes for hanging are formed at the bottom of the grab cage 2. In this embodiment, the grab cage 2 also includes a top plate, and the upper ends of the arc rods 22 are connected to the top plate, and the top plate is connected to the lower side of the middle of the fixing frame 8.

[0034] An axially sliding lifting column 3 is provided on the inner side of the upper end of the rod body 1, and a grab assembly 4 is rotatably connected to the upper end of the lifting column 3. The grab assembly 4 includes a plurality of grab hooks 47 with adjustable angles for grabbing the grab cage 2. In the present embodiment, the number of the grab hooks 47 is eight, forming an eight-hook grab assembly 4. After the threaded connection of the rod body 1 fails, the grab assembly 4 can stably and accurately grab the grab cage 2 to form a hanging fit; the rotation direction of the grab assembly 4 is horizontal rotation around the upper end of the lifting column 3. Because the grab assembly 4 can rotate, it will not affect the rotation fit of the threads at both ends of the rod body 1.

[0035] A traction rope 5 is connected between the grab cage 2 and the lifting column 3, and the traction rope 5 is connected to the upper side of the fixing frame 8. An elastic telescopic part 6 is provided in the middle of the traction rope 5. The traction rope 5 is divided into two sections, and the elastic telescopic part 6 is connected between the two sections of the traction rope 5. The elastic telescopic part 6 is a tension spring. The lifting column 3 has an upper limit position and a lower limit position. When not subject to external force, the tension spring causes the lifting column 3 to slide downward to the lower limit position and causes the grab assembly 4 to be located on the inner side of the end of the rod body 1, that is, the grab assembly 4 is located on the inner side of the internal thread of the upper end of the rod body; a plurality of auxiliary ropes 7 are also connected between the two sections of the traction rope 5, and the traction rope 5 and the auxiliary rope 7 are both steel wire ropes. The auxiliary ropes 7 are evenly distributed around the tension spring, and the length of the auxiliary ropes 7 is not less than the maximum stretching length of the tension spring.

[0036] When the threaded connection structure of the adjacent rod body 1 fails and disengages, including accidental disengagement in the well and normal disengagement in the well; the grab assembly 4 is hooked with the grab cage 2, and the grab cage 2 of the upper rod body 1 causes the grab assembly 4 and the lifting column 3 to move upward and stretch the tension spring through the upper traction rope 5, the auxiliary rope 7 is tightened, the grab assembly 4 moves out of the lower rod body 1, and the lifting column 3 moves to the upper limit position. When an accident occurs in the well and the rod body 1 is disengaged, after the tension spring is stretched to the maximum length, the auxiliary rope 7 is tightened to assist the tension spring connection to prevent the lower rod body 1 from falling into the well; when the well is shackled, the grab assembly 4 is located outside the rod body 1, and the grab hook 47 is operated to separate the grab hook 47 from the grab cage 2 of the upper rod body 1 to achieve shackle. When the rod body 1 breaks in the middle of the well, the lifting column 3 maintains the lower limit position, the tension spring stretches and tightens the auxiliary rope 7, and the traction rope 5 and the auxiliary rope 7 connect the upper and lower ends of the rod body 1 to prevent the lower rod body 1 in the well from falling into the well; thus, comprehensive anti-falling protection of the rod body 1 is formed.

[0037] A core frame 9 is provided at the upper end of the rod body 1, and the lifting column 3 slides through the middle of the core frame 9. The core frame 9 is similar in structure to the fixed frame 8, and has a number of vertical through holes that do not affect the passage of drilling fluid; a light hole is provided in the middle of the core frame 9 for the lifting column 3 to slide and rise. The vertical cross-section of the lifting column 3 is an I-shaped shape, and the upper and lower ends of the lifting column 3 can limit the lifting and lowering of the lifting column 3, that is, limit the upper limit position and the lower limit position of the sliding of the lifting column 3.

[0038] The upper end of the lifting column 3 is provided with a rotating support 10 for supporting the rotation of the grab assembly 4. The grab assembly 4 includes a column 41. The vertical cross-section of the column 41 is an I-shaped column. The lower end of the column 41 is rotatably connected to the rotating support 10 at the upper end of the lifting column 3. The rotating support 10 wraps the lower end of the column 41 to support the rotation of the column 41. The cross-sectional shape of the column section of the lifting column 3 is a rectangle, and the cross-sectional shape of the light hole on the core frame 9 is a rectangle matching the column section of the lifting column 3, so that the lifting column 3 can only be lifted and lowered but not rotated.

[0039] An annular frame 45 is connected to the outer side of the middle part of the column 41, and a plurality of the above-mentioned grab hooks 47 are evenly arranged along the annular frame 45. The grab hooks 47 are rotatably connected to the annular frame 45. The annular frame 45 includes an octagonal frame-shaped annular rod and a plurality of radial rods. The radial rods are connected to the inner side of the annular rod, and the inner ends of the radial rods are connected to the outer side of the column 41.

[0040] A vertically lifting cylinder 42 is provided on the sliding sleeve outside the column 41, and a spring 43 is connected between the lifting cylinder 42 and the upper end of the column 41. The spring 43 causes the lifting cylinder 42 to be located at the lower part of the column 41, and the lower end of the lifting cylinder 42 is attached to the upper side of the rotating support 10. In some embodiments, a thrust bearing can be provided on the upper side of the rotating support 10 to reduce the friction between the upper side of the rotating support 10 and the lower side of the lifting cylinder 42; a gear 46 is provided at the rotation connection between the grab hook 47 and the annular frame 45, and the gear 46 is rotationally connected to the annular rod of the annular frame 45, that is, the gear 46 rotates around the outer side of the annular rod of the annular frame 45; a plurality of vertical racks 421 cooperating with the gears 46 are provided on the outer side of the lifting cylinder 42; a vertical strip hole 422 is provided on the lifting cylinder 42 between the racks 421, and the radial rod of the annular frame 45 passes through the strip hole 422 and is connected to the middle part of the column 41.

[0041] In this embodiment, the number of the racks 421 and the strip holes 422 are both eight, and the radial rods of the annular frame 45 cooperate with the strip holes 422, which does not affect the lifting of the lifting cylinder 42, and can also guide the lifting of the lifting cylinder 42 vertically. Handles 44 are provided on both sides of the lower end of the lifting cylinder 42; the lifting cylinder 42 compresses the spring 43 and moves upward through the handles 44, the racks 421 move upward synchronously, the gears 46 rotate, and all the grab hooks 47 open synchronously, so that the grab assembly 4 and the grab cage 2 can be separated, and the disassembly process is relatively simple, which has little impact on the oil well unbuckling work. On the contrary, when there is no external force, the spring 43 makes the lifting cylinder 42 descend, and the racks 421 and the gears 46 cooperate to make all the grab hooks 47 rotate synchronously, and the upper ends of the grab hooks 47 are close to each other, and the synchronous action of all the grab hooks 47 can be achieved through the lifting cylinder 42.

[0042] The grab hook 47 includes a U-shaped hook portion and a straight rod section connected to one end of the U-shaped hook portion. The straight rod section is a portion extending in the same direction as one end of the U-shaped portion. The end of the straight rod section is rotatably connected to the annular frame 45 through a gear 46. The U-shaped hook portion faces the inner ring side, and the U-shaped hook portion can extend into the inner side of the lower part of the grab cage 2 to grab the grab cage 2.

[0043] In the connection work of oil drilling, the iron roughneck makes the upper rod body 1 correspond to the lower rod body 1 at the wellhead position, rotates the upper rod body 1 to make the external thread of the upper rod body 1 match the internal thread of the lower rod body 1, and the grab cage 2 of the upper rod body 1 rotates and moves downward with the upper rod body 1. The downward movement of the grab cage 2 acts on the upper side of the grab hook 47, exerts on the upper side of the U-shaped hook part of the grab hook 47, and all the grab hooks 47 are stretched open, and the lifting cylinder 42 rises and compresses the spring 43; when the grab hook 47 corresponds to the lower hole of the grab cage 2, the spring 43 makes the lifting cylinder 42 descend, and the U-shaped hook part of the upper part of the grab hook 47 extends into the grab cage 2. After the upper rod body 1 is rotated continuously to make it firmly threaded with the lower rod body 1, refer to Figure 2 The bottom ring 21 of the cage 2 corresponds to the inner side of the U-shaped hook of the hook 47. When the threaded connection structure of the rod body 1 in the well fails, the lower rod body 1 falls, and the hook 47 moves down to grab the bottom ring 21 of the cage 2 to achieve hanging, so as to prevent the entire lower rod body 1 in the well from being completely separated from the upper rod body 1.

[0044] Compared with the prior art, the drill rod of the present invention has the following advantages: in the prior art, after the drill rod breaks and falls off, the upper drill rod continues to rotate, which will damage the anti-falling structure and cause the anti-falling structure to fail. However, when no accident is found in the present drill rod, when the threaded connection fails, the upper drill rod continues to rotate, so that the grabbing assembly 4 can rotate through the grab cage 2. When the middle part of the rod body 1 breaks, the multiple auxiliary ropes 7 structure in the middle of the traction rope 5 also has strong torsion adaptability. The rotation of the upper drill rod will not damage the hanging anti-falling structure, and it is not easy to damage the traction rope 5 and the auxiliary rope 7 structure, which significantly reduces the failure of the anti-falling structure due to the continued rotation of the upper drill rod, creating favorable conditions for salvage and rescue.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A petroleum exploration drill pipe, comprising a hollow rod body (1), the upper end of the rod body (1) being provided with an internal thread, and the lower end of the rod body (1) being provided with an external thread matching the internal thread; characterized in that: A grab cage (2) is provided on the inner side of the lower end of the rod body (1); an axially sliding lifting column (3) is provided on the inner side of the upper end of the rod body (1); a grab assembly (4) is rotatably connected to the upper end of the lifting column (3); the grab assembly (4) comprises a plurality of angle-adjustable grab hooks (47) for grabbing the grab cage (2); a traction rope (5) is connected between the grab cage (2) and the lifting column (3); an elastic telescopic member (6) is provided in the middle of the traction rope (5).

2. The oil exploration drill pipe according to claim 1, characterized in that: A fixing frame (8) is provided at the lower end of the rod body (1), and the traction rope (5) and the grab cage (2) are respectively connected to the upper side and the lower side of the fixing frame (8).

3. The oil exploration drill pipe according to claim 1 or 2, characterized in that: The grab cage (2) is a spherical shell frame structure; the grab cage (2) comprises a bottom ring (21), a plurality of arc-shaped rods (22) are connected to the upper circumference of the bottom ring (21), a reinforcement ring (23) is provided in the middle of the arc-shaped rods (22), and the reinforcement ring (23) is parallel to the bottom ring (21).

4. The oil exploration drill pipe according to claim 1, characterized in that: The traction rope (5) is divided into two sections, and the elastic telescopic member (6) is connected between the two sections of the traction rope (5). The elastic telescopic member (6) is a tension spring, and the tension spring causes the lifting column (3) to slide downward and causes the grabbing assembly (4) to be located inside the end of the rod body (1). A plurality of auxiliary ropes (7) are also connected between the two sections of the traction rope (5), and the auxiliary ropes (7) are evenly distributed around the circumference, and the length of the auxiliary ropes (7) is not less than the maximum stretching length of the tension spring.

5. The oil exploration drill pipe according to claim 4, characterized in that: The traction rope (5) and the auxiliary rope (7) are both steel wire ropes.

6. The oil exploration drill pipe according to claim 1, characterized in that: The upper end of the rod body (1) is provided with a core frame (9), the lifting column (3) slides through the middle of the core frame (9), and the cross-sectional shape of the lifting column (3) is an I-shaped; the upper end of the lifting column (3) is provided with a rotating support (10) for supporting the grabbing assembly (4) to rotate.

7. The oil exploration drill pipe according to claim 1, characterized in that: The grab assembly (4) comprises a column (41) having an I-shaped cross section, and the lower end of the column (41) is rotatably connected to the lifting column (3); an annular frame (45) is connected to the outer side of the column (41), and a plurality of grab hooks (47) are evenly arranged along the annular frame (45), and the grab hooks (47) are rotatably connected to the annular frame (45).

8. The oil exploration drill pipe according to claim 7, characterized in that: The grab hook (47) comprises a U-shaped hook portion and a straight rod section connected to one end of the U-shaped hook portion, the end of the straight rod section is rotatably connected to the annular frame (45), the U-shaped hook portion faces the inner ring side, and the U-shaped hook portion extends into the lower inner side of the grab cage (2) to grab the grab cage (2).

9. The oil exploration drill pipe according to claim 7, characterized in that: A vertically lifting cylinder (42) is provided on the sliding sleeve outside the column (41), and a spring (43) is connected between the lifting cylinder (42) and the upper end of the column (41), and the spring (43) enables the lifting cylinder (42) to be located at the lower part of the column (41); a gear (46) is provided at the rotation connection between the grab hook (47) and the annular frame (45), and the gear (46) is rotationally connected to the annular frame (45), and a plurality of vertical racks (421) cooperating with the gears (46) are provided on the outside of the lifting cylinder (42); the lifting cylinder (42) between the racks (421) is provided with vertical strip holes (422), and the annular frame (45) passes through the strip holes (422) and is connected to the middle part of the column (41).

10. The oil exploration drill pipe according to claim 9, characterized in that: Handles (44) are provided on both sides of the lower end of the lifting cylinder (42).

Images