Petroleum drilling tool and drill collar connecting device and using method thereof

Abstract

The invention provides a petroleum drilling tool and drill collar connecting device and a using method thereof.The petroleum drilling tool and drill collar connecting device comprises a drill collar, the head of the drill collar is connected with a petroleum drilling tool through conical threads, drilling fluid channels are machined in the center of the drill collar and the center of the petroleum drilling tool respectively, and drilling fluid channel threads are machined on the inner walls of the drilling fluid channels; a first hollow threaded sleeve is installed in the center of the drill collar in a matched mode, a second hollow threaded sleeve is installed in the center of the petroleum drilling tool in a matched mode, a drill collar end elastic expansion clamping connector is installed in the first hollow threaded sleeve in a sliding limiting matched mode, and a petroleum drilling tool end elastic expansion clamping connector is installed in the second hollow threaded sleeve in a sliding limiting matched mode. The drill collar end elastic expansion clamping connector and the petroleum drilling tool end elastic expansion clamping connector are connected through a steel wire rope. When the bit palm part of the petroleum drilling tool bit and the screw thread part of the down-the-hole bit are broken, the broken parts can still be connected with the drill collar through the connecting device, fishing, milling, sidetracking and the like can be avoided when the drilling tool is replaced, and therefore the process of replacing the drilling tool is simplified.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and natural gas engineering, and in particular to a connecting device for an oil drill tool and a drill collar and a use method thereof. Background Art

[0002] Drilling tools are indispensable tools in oil and gas extraction. They are used to break rocks and form wellbores during oil and gas drilling operations. The performance of drilling tools will directly affect the drilling quality, drilling efficiency and drilling costs.

[0003] Drill tool breakage is a common accident during drilling. The causes of drill tool breakage accidents are fatigue damage, corrosion damage, mechanical damage, and accidental damage. However, these factors are not independent of each other and are often interrelated and mutually reinforcing. A specific accident may be caused by one or more of these factors. To meet operational requirements, drill tools are designed with a large diameter drill bit and a smaller diameter threaded portion of the drill body. The significant difference in cross-sectional size between these two parts can easily lead to stress concentration, making drill tools prone to breakage during continuous high-intensity operations. Some situations are relatively simple and easy to handle, often resulting in a successful first-time solution. Others are more complex to handle, as drill tool breakage is often accompanied by drill sticking. Improper handling can lead to further accidents. Summary of the Invention

[0004] The purpose of the present invention is to design a connecting device for oil drilling tools and drill collars, so that when the palm portion of the oil drilling tool drill bit and the threaded portion of the down-the-hole drill bit are broken off, the broken portions can still remain connected to the drill collar through the connecting device, and when replacing the drilling tool, salvaging, milling and side drilling can be avoided, thereby simplifying the process of replacing the drilling tool.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: a connecting device for a petroleum drill tool and a drill collar, comprising a drill collar, the head of the drill collar being connected to the petroleum drill tool via a tapered thread, the center of the drill collar and the petroleum drill tool being respectively machined with a drilling fluid channel, the inner wall of the drilling fluid channel being machined with a drilling fluid channel thread; A first hollow screw sleeve is installed in the center of the drill collar, and a second hollow screw sleeve is installed in the center of the oil drill tool. An elastic expansion joint at the end of the drill collar is installed inside the first hollow screw sleeve through a sliding limit, and an elastic expansion joint at the end of the oil drill tool is installed inside the second hollow screw sleeve through a sliding limit. The elastic expansion joint at the end of the drill collar and the elastic expansion joint at the end of the oil drill tool are connected by a wire rope.

[0006] Preferably, the first hollow screw sleeve and the second hollow screw sleeve adopt the same structure, both including a circular through hole processed in the center and three evenly distributed waist-shaped holes with arcs. The circular through hole serves as a circulation channel for the drilling fluid between the drill collar and the oil drill tool on the one hand, and as a clamping part for the elastic expansion joint at the drill collar end and the elastic expansion joint at the oil drill tool end on the other hand; the waist-shaped holes with arcs serve as a circulation channel for the drilling fluid.

[0007] Preferably, the bottom end of the elastic expansion joint at the drill collar end is provided with a wire rope connector for fixing and connecting the wire rope, and the other end of the wire rope connector is evenly distributed on the circumference with three snap-on straight arms that can be squeezed and closed, and the ends of the snap-on straight arms are processed to form a snap joint; the three snap joints are combined to form a conical side surface, and the sharp connection points of the snap joints are all rounded; The buckle straight arm matches the circular through hole of the first hollow screw sleeve.

[0008] Preferably, the elastic expansion joint at the end of the oil drill tool has the same structure as the elastic expansion joint at the end of the drill collar, wherein a fan-shaped anti-fall baffle is provided in the middle of the straight arm of the buckle of the elastic expansion joint at the end of the oil drill tool, and the second hollow screw sleeve is provided between the fan-shaped anti-fall baffle and the buckle joint of the elastic expansion joint at the end of the oil drill tool.

[0009] Preferably, the length of the buckle straight arm of the elastic expansion joint at the drill collar end is longer than the length of the buckle straight arm of the elastic expansion joint at the oil drilling tool end.

[0010] Preferably, the drilling fluid channel thread in the oil drill tool extends from the top of the oil drill tool to the water hole and the nozzle, and the drilling fluid channel thread in the drill collar extends upward from the overlap of the drill collar and the oil drill tool to the height of at least one first hollow screw sleeve, and the first hollow screw sleeve and the second hollow screw sleeve are respectively fixed to the inside of the oil drill tool and the drill collar through threaded connection.

[0011] Preferably, the bottom wire rope connectors of the elastic expansion joint at the drill collar end and the elastic expansion joint at the oil drilling tool end are connected to the wire rope by clamping.

[0012] Preferably, the front and rear surfaces of the snap-on straight arms of the elastic expansion joint at the drill collar end and the elastic expansion joint at the oil drilling tool end are arc-shaped, wherein the front arc and the upper circular surface have the same circumferential curvature, and when the three snap-on joints are under pressure and contact, the top ends can hook to form a conical surface and can pass through the circular through holes in the centers of the first hollow screw sleeve and the second hollow screw sleeve.

[0013] Preferably, another aspect of the present invention provides a method for using a petroleum drilling tool and a drill collar connection device, comprising the following steps: Step 1: Before the oil drill tool starts drilling, the staff prepares the connection device, first clamps the elastic expansion joint at the oil drill tool end and the second hollow threaded sleeve, and then fixes the elastic expansion joint at the oil drill tool end and the threaded end of the drilling fluid channel of the oil drill tool together through threaded connection; Step 2: After completing step 1, use a tool to fix the first hollow threaded sleeve and the threaded end of the drilling fluid channel of the drill collar together through threaded connection, and then snap the elastic expansion joint of the drill collar end of the connecting device into the circular through hole in the first hollow threaded sleeve; Step 3: After completing steps 1 and 2, the drill collar and the oil drilling tool are fastened together through threaded connections, and finally the drilling operation is carried out; Step 4: When the oil drill tool breaks off in the well, the connecting device in the oil drill tool connects the two ends of the break off together through the connecting device, and the staff can remove the oil drill tool from the well according to the operation. At this time, the elastic expansion joint at the drill collar end and the elastic expansion joint at the oil drill tool end are clamped together with the first hollow screw sleeve and the second hollow screw sleeve. The elastic expansion joint at the drill collar end is connected to the elastic expansion joint at the oil drill tool end through the wire rope. In the process of removing the drill pipe and the drill collar upward, the connecting device lifts the broken part of the oil drill tool upward from the well until it is removed from the well.

[0014] The present invention has the following beneficial effects: 1. The connecting device has a simple structure and is easy to process. Only a few simple parts can be used to assemble the connecting device between the oil drilling tool and the drill collar.

[0015] 2. The connection device does not change the main processing procedures of the drill tool and drill collar. In some drilling fluid channels inside the drill tool and drill collar, threads are turned to connect with the connection device. This does not change other processing procedures and does not affect the main mechanical properties and working characteristics of the two.

[0016] 3. The connection device is easy to install and operate. The connection device has few parts and a simple structure, with few installation steps and simple operation.

[0017] 4. Traditional methods for dealing with broken drill tools include using tools to salvage the drill tools, using special tools to grind the drill tools, and performing side drilling. Compared with the above methods, the use of the connecting device in the present invention can save time, simplify steps, save material and financial resources, and improve production efficiency.

[0018] 5. The present invention has wide applicability, being applicable not only to oil drilling tools but also to other drilling tools of similar structure, such as down-the-hole drilling tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and examples.

[0020] Figure 1It is a cross-sectional view of the overall structure of the oil drilling tool and drill collar connection device of the present invention.

[0021] Figure 2 This is a three-dimensional diagram of the connection structure of the oil drilling tool and the drill collar connection device of the present invention.

[0022] Figure 3 This is a front view of the connection structure of the oil drilling tool and drill collar connection device of the present invention.

[0023] Figure 4 It is a cross-sectional view of the connection structure of the oil drilling tool and the drill collar connection device of the present invention.

[0024] Figure 5 This is a cross-sectional view of the location of the thread of the drilling fluid channel in the petroleum drilling tool of the present invention.

[0025] Figure 6 This is a three-dimensional diagram of the oil drilling tool of the present invention.

[0026] Figure 7 It is a cross-sectional view of the position of the thread of the drilling fluid channel in the drill collar of the present invention.

[0027] Figure 8 This is a three-dimensional diagram of the drill collar in the present invention.

[0028] Figure 9 This is the main view of the elastic expansion joint structure at the drill collar end.

[0029] Figure 10 This is a three-dimensional diagram of the elastic expansion joint structure at the drill collar end.

[0030] Figure 11 This is the front view of the elastic expansion joint at the end of the oil drilling tool.

[0031] Figure 12 This is a cross-sectional view of the elastic expansion joint at the end of the oil drilling tool.

[0032] Figure 13 This is a three-dimensional diagram of the elastic expansion joint at the end of the oil drilling tool.

[0033] Figure 14 It is the main view of the first hollow screw sleeve structure.

[0034] Figure 15 It is a cross-sectional view of the first hollow screw sleeve structure.

[0035] Figure 16 It is a three-dimensional diagram of the first hollow screw sleeve structure.

[0036] Figure 17 for Figure 1 Schematic diagram of the connection between the medium elastic expansion joint and the hollow threaded sleeve.

[0037] Figure 18 for Figure 1Schematic diagram of the connection between the drill collar and the hollow threaded sleeve.

[0038] Figure 19 for Figure 1 Schematic diagram of the connection between CNPC drilling tools and hollow threaded sleeves.

[0039] In the figure: drill collar 1, oil drilling tool 2, first hollow screw sleeve 3, elastic expansion joint at drill collar end 4, elastic expansion joint at oil drilling tool end 5, wire rope 6, drilling fluid channel 7, water hole and nozzle 8, drilling fluid channel thread 9, snap joint 10, snap straight arm 11, wire rope connector 12, fan-shaped anti-fall baffle 13, circular through hole 14, curved waist hole 15, connection between drill collar and hollow screw sleeve 16, connection between oil drilling tool and hollow screw sleeve 17, trace of clamping connection between elastic expansion joint and wire rope 18, second hollow screw sleeve 19. DETAILED DESCRIPTION

[0040] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] Example 1: See also Figure 1-19 A connecting device for an oil drill tool and a drill collar comprises a drill collar 1. The head of the drill collar 1 is connected to the oil drill tool 2 via a tapered thread. The centers of the drill collar 1 and the oil drill tool 2 are respectively processed with a drilling fluid channel 7, and the inner wall of the drilling fluid channel 7 is processed with a drilling fluid channel thread 9; a first hollow screw sleeve 3 is cooperatively installed at the center of the drill collar 1, and a second hollow screw sleeve 19 is cooperatively installed at the center of the oil drill tool 2. An elastic expansion joint 4 at the end of the drill collar is installed inside the first hollow screw sleeve 3 through a sliding limit fit, and an elastic expansion joint 5 at the end of the oil drill tool is installed inside the second hollow screw sleeve 19 through a sliding limit fit. The elastic expansion joint 4 at the end of the drill collar and the elastic expansion joint 5 at the end of the oil drill tool are connected by a wire rope 6.

[0042] Furthermore, the first hollow screw sleeve 3 and the second hollow screw sleeve 19 adopt the same structure, both including a circular through hole 14 processed in the center and three evenly distributed waist-shaped holes 15 with arcs. The circular through hole 14 serves as a circulation channel for the drilling fluid of the drill collar 1 and the oil drill tool 2 on the one hand, and as a clamping part of the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill tool end on the other hand; the waist-shaped holes 15 with arcs serve as a circulation channel for the drilling fluid.

[0043] Furthermore, the bottom end of the drill collar end elastic expansion joint 4 is provided with a wire rope connector 12 for fixing and connecting the wire rope 6. The other end of the wire rope connector 12 is evenly distributed on the circumference with three clamping straight arms 11 that can be squeezed and closed. The ends of the clamping straight arms 11 are processed to form a clamping joint 10. The three clamping joints 10 are combined to form a conical side surface, and the sharp connection points of the clamping joints 10 are all rounded. The buckle straight arm 11 matches with the circular through hole 14 of the first hollow screw sleeve 3 .

[0044] Furthermore, the structure of the elastic expansion joint 5 at the oil drill tool end is the same as that of the elastic expansion joint 4 at the drill collar end, wherein a fan-shaped anti-fall baffle 11 is provided in the middle of the snap straight arm 11 of the elastic expansion joint 5 at the oil drill tool end, and the second hollow screw sleeve 19 is provided between the fan-shaped anti-fall baffle 11 of the elastic expansion joint 5 at the oil drill tool end and the snap joint 10.

[0045] Furthermore, the length of the buckle straight arm 11 of the drill collar end elastic expansion joint 4 is longer than the length of the buckle straight arm 11 of the oil drilling tool end elastic expansion joint 5.

[0046] Furthermore, the drilling fluid channel thread 9 in the oil drill tool 2 extends from the top of the oil drill tool to the water hole and the nozzle 8, and the drilling fluid channel thread 9 in the drill collar 1 extends upward from the overlap of the drill collar and the oil drill tool to the height of at least one first hollow screw sleeve 3. The first hollow screw sleeve 3 and the second hollow screw sleeve 19 are respectively fixed to the inside of the oil drill tool 2 and the drill collar 1 through threaded connections.

[0047] Furthermore, the bottom wire rope connector 12 of the drill collar end elastic expansion joint 4 and the oil drilling tool end elastic expansion joint 5 is connected to the wire rope 6 by clamping, thereby simplifying the connection process and ensuring reliability.

[0048] Furthermore, the front and rear surfaces of the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drilling tool end are arc-shaped, wherein the front arc and the upper circular surface have the same circumferential curvature. When the three snap joints 10 are under pressure and contact, the top ends can hook to form a conical surface and can pass through the circular through holes in the centers of the first hollow screw sleeve 3 and the second hollow screw sleeve 19.

[0049] Example 2: A connecting device for oil drilling tools and drill collars, such as Figure 1 As shown in FIG, it is composed of a drill collar 1, an oil drilling tool 2 and a connecting device. Figure 2-4 As shown, the connecting device consists of a first hollow threaded sleeve 3, an elastic expansion joint 4 at the drill collar end, an elastic expansion joint 5 at the oil drill tool end, and a wire rope 6. The elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill tool end are connected by a wire rope 6 to form a connector in the connecting device; Figures 5 to 8 As shown, the oil drill 2 and the drilling fluid channel 7 in the drill collar 1 are threaded, wherein the drilling fluid channel thread 9 in the oil drill 2 extends from the top of the oil drill 2 to the water hole and the nozzle 8, and the drilling fluid channel thread 9 in the drill collar 1 extends upward from the overlap of the drill collar 1 and the oil drill 2 to the height of one and a half first hollow threaded sleeves 3; the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill end in the connecting device are respectively as shown in FIG. Figures 9 to 13As shown, the bottom wire rope connector 12 of the elastic expansion joint 5 at the oil drill end is cylindrical with a circular hole in the middle to connect the wire rope 6. Three buckle straight arms 11 are evenly distributed along the circumference on the upper circular surface of the wire rope connector 12. A fan-shaped anti-fall baffle 13 is provided in the middle of the buckle straight arm 11. The end of the buckle straight arm 11 is connected to a buckle joint 10. The three buckle joints 10 are combined to form a conical side. To reduce wear, the sharp connection points of the buckle joint 10 are all rounded; the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill end have the same structure, but there is no fan-shaped anti-fall baffle 13 in the middle of the buckle straight arm 11, and in order to facilitate assembly and disassembly, the length of the buckle straight arm 11 of the drill collar end elastic expansion joint 4 is much longer than the length of the buckle straight arm 11 of the oil drill end elastic expansion joint 5; the hollow screw sleeve in the connecting device, such as Figures 14-16 As shown, a circular through hole 14 is opened in the center to form an elastic expansion joint engaging portion and three arc-shaped waist-shaped holes 15 are evenly distributed between the stud threads to serve as the main channel for drilling fluid.

[0050] In this embodiment, the two hollow threaded sleeves are connected to the drilling fluid channel threads 9 at the drill collar 1 and the oil drilling tool 2 respectively.

[0051] In this embodiment, the diameters of the upper and lower circular surfaces of the bottom wire rope connector 12 in the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill tool end are both smaller than the diameter of the circular through hole of the elastic expansion joint engaging portion 14 of the hollow screw sleeve 3. When the oil drill tool is rotating, the connector does not rotate with the hollow screw sleeve 3.

[0052] In this embodiment, in order to prevent the elastic expansion joint 5 at the oil drill end from falling due to gravity and blocking the water hole and nozzle 8, thereby affecting the circulation of drilling fluid, a fan-shaped anti-fall baffle 13 is provided in the middle of the elastic expansion joint 5 at the oil drill end. When the elastic expansion joint 5 at the oil drill end and the wire rope 6 fall vertically downward under the action of gravity, the fan-shaped anti-fall baffle 13 in the elastic expansion joint 5 at the oil drill end is blocked by the hollow screw sleeve 3, thereby preventing them from falling further.

[0053] In this embodiment, in order to facilitate assembly and disassembly, the length of the buckle straight arm 11 of the elastic expansion joint 4 at the drill collar end is much longer than the length of the buckle straight arm 11 of the elastic expansion joint 5 at the oil drilling tool end.

[0054] In this embodiment, the three snap joints 10 can pass through the elastic expansion joint engaging portion 14 after being squeezed, so that the elastic expansion joint and the hollow screw sleeve 3 can be engaged together. When relaxed, the diameter of the conical bottom surface formed by the snap joint 10 is slightly larger than the elastic expansion joint engaging portion 14 in the hollow screw sleeve 3, so that the elastic expansion joint 4 at the drill collar end is blocked by the hollow screw sleeve 3 and will not fall off.

[0055] Example 3: Another aspect of the present invention provides a method for using a petroleum drilling tool and a drill collar connection device, comprising the following steps: Step 1: Before the oil drill tool starts drilling, the staff prepares the connection device, first clamps the elastic expansion joint 5 at the oil drill tool end and the second hollow screw sleeve 19, and then fixes the elastic expansion joint 5 at the oil drill tool end and the end of the drilling fluid channel thread 9 of the oil drill tool 2 together through threaded connection; Step 2: After completing step 1, use a tool to fix the first hollow screw sleeve 3 and the end of the drilling fluid channel thread 9 of the drill collar 1 together through threaded connection, and then snap the elastic expansion joint 4 at the drill collar end of the connecting device into the circular through hole 14 in the first hollow screw sleeve 3; Step 3: After completing steps 1 and 2, the drill collar 1 and the oil drilling tool 2 are fastened together by threaded connection, and finally the drilling operation is carried out; Step 4: When the oil drill tool 2 breaks off in the well, the connecting device in the oil drill tool 2 connects the two ends of the break off together through the connecting device, and the staff can remove the oil drill tool 2 from the well according to the operation. At this time, the elastic expansion joint 4 at the drill collar end and the elastic expansion joint 5 at the oil drill tool end are both engaged with the first hollow screw sleeve 3 and the second hollow screw sleeve 19. The elastic expansion joint 4 at the drill collar end is connected to the elastic expansion joint 5 at the oil drill tool end through the wire rope 6. In the process of removing the drill pipe and the drill collar 1 upward, the connecting device lifts the broken part of the oil drill tool 2 upward from the well until it is removed from the well.

Claims

1. A connecting device for a petroleum drilling tool and a drill collar, characterized in that: The drill collar (1) comprises a head portion of the drill collar (1) connected to a petroleum drilling tool (2) via a tapered thread, the center portions of the drill collar (1) and the petroleum drilling tool (2) are respectively machined with a drilling fluid channel (7), and the inner wall of the drilling fluid channel (7) is machined with a drilling fluid channel thread (9); A first hollow screw sleeve (3) is mounted in the center of the drill collar (1), a second hollow screw sleeve (19) is mounted in the center of the oil drilling tool (2), a drill collar end elastic expansion joint (4) is mounted in the interior of the first hollow screw sleeve (3) through a sliding limit, a oil drilling tool end elastic expansion joint (5) is mounted in the interior of the second hollow screw sleeve (19) through a sliding limit, and the drill collar end elastic expansion joint (4) and the oil drilling tool end elastic expansion joint (5) are connected via a wire rope (6).

2. The oil drilling tool and drill collar connection device according to claim 1, characterized in that: The first hollow screw sleeve (3) and the second hollow screw sleeve (19) have the same structure, both comprising a circular through hole (14) machined in the center and three evenly distributed waist-shaped holes (15) with arcs. The circular through hole (14) serves as a circulation channel for the drilling fluid of the drill collar (1) and the oil drilling tool (2) on the one hand, and as a clamping part of the elastic expansion joint (4) at the end of the drill collar and the elastic expansion joint (5) at the end of the oil drilling tool on the other hand; the waist-shaped holes (15) with arcs serve as a circulation channel for the drilling fluid.

3. The oil drilling tool and drill collar connection device according to claim 2, characterized in that: The bottom end of the drill collar end elastic expansion joint (4) is provided with a wire rope connector (12) for fixing and connecting the wire rope (6), and the other end of the wire rope connector (12) is evenly distributed in a circumference with three snap-on straight arms (11) that can be squeezed together, and the ends of the snap-on straight arms (11) are processed to form a snap-on joint (10); the three snap-on joints (10) are combined to form a conical side surface, and the sharp connection parts of the snap-on joints (10) are all rounded; The buckle straight arm (11) matches the circular through hole (14) of the first hollow screw sleeve (3).

4. The oil drilling tool and drill collar connection device according to claim 3, characterized in that: The structure of the drill collar end elastic expansion joint (4) of the oil drill end elastic expansion joint (5) is the same, wherein a fan-shaped anti-fall baffle (11) is provided in the middle of the buckle straight arm (11) of the oil drill end elastic expansion joint (5), and the second hollow screw sleeve (19) is provided between the fan-shaped anti-fall baffle (11) of the oil drill end elastic expansion joint (5) and the buckle joint (10).

5. The oil drilling tool and drill collar connection device according to claim 4, characterized in that: The length of the buckle straight arm (11) of the drill collar end elastic expansion joint (4) is longer than the length of the buckle straight arm (11) of the oil drilling tool end elastic expansion joint (5).

6. The oil drilling tool and drill collar connection device according to claim 3, characterized in that: The drilling fluid channel thread (9) in the oil drilling tool (2) extends from the top of the oil drilling tool to the water hole and the nozzle (8), and the drilling fluid channel thread (9) in the drill collar (1) extends upward from the overlap of the drill collar and the oil drilling tool to the height of at least a first hollow screw sleeve (3). The first hollow screw sleeve (3) and the second hollow screw sleeve (19) are respectively fixed to the inside of the oil drilling tool (2) and the drill collar (1) through threaded connection.

7. The oil drilling tool and drill collar connection device according to claim 4, characterized in that: The bottom wire rope connector (12) of the elastic expansion joint (4) at the drill collar end and the elastic expansion joint (5) at the oil drilling tool end is connected to the wire rope (6) by clamping.

8. The oil drilling tool and drill collar connection device according to claim 4, characterized in that: The front and rear surfaces of the snap-fit straight arms (11) of the elastic expansion joint (4) at the drill collar end and the elastic expansion joint (5) at the oil drilling tool end are arc-shaped, wherein the front arc and the upper circular surface have the same circumferential curvature. When the three snap-fit joints (10) are in contact under pressure, the top ends can be hooked to form a conical surface and can pass through the circular through holes in the centers of the first hollow screw sleeve (3) and the second hollow screw sleeve (19).

9. The method for using the oil drilling tool and drill collar connection device according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Before the oil drilling tool is used for drilling, the staff prepares the connection device, firstly engages the elastic expansion joint (5) at the oil drilling tool end and the second hollow screw sleeve (19), and then fixes the elastic expansion joint (5) at the oil drilling tool end and the end of the drilling fluid channel thread (9) of the oil drilling tool (2) together through threaded connection; Step 2: After completing step 1, use a tool to connect and fix the first hollow screw sleeve (3) and the end of the drilling fluid channel thread (9) of the drill collar (1) together through threaded connection, and then snap the elastic expansion joint (4) at the drill collar end of the connecting device into the circular through hole (14) in the first hollow screw sleeve (3); Step 3: After completing steps 1 and 2, the drill collar (1) and the oil drilling tool (2) are fastened together by threaded connection, and finally the drilling operation is carried out; Step 4: When the oil drill tool (2) breaks off in the well, the connecting device in the oil drill tool (2) connects the two ends of the broken part together through the connecting device, and the staff can remove the oil drill tool (2) from the well according to the operation. At this time, the elastic expansion joint (4) at the drill collar end and the elastic expansion joint (5) at the oil drill tool end are both engaged with the first hollow screw sleeve (3) and the second hollow screw sleeve (19). The elastic expansion joint (4) at the drill collar end is connected to the elastic expansion joint (5) at the oil drill tool end through the wire rope (6). In the process of removing the drill pipe and the drill collar (1) upward, the connecting device lifts the broken part of the oil drill tool (2) upward from the well until it is removed from the well.

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