Bridge plug pin cutting test device and operation method

Abstract

The invention relates to the technical field of pin cutting testing, in particular to a bridge plug pin cutting testing device and an operation method.The bridge plug pin cutting testing device comprises a workbench and a driving motor, the surface of the workbench is rotationally connected with a cutting driving mechanism, the driving motor is fixedly connected to the back face of the workbench, and the back face of the workbench is fixedly connected with a pressure adjusting mechanism; the back face of the workbench is slidably connected with a cutting mechanism. According to the invention, the pre-compression amount of the spring rod is changed, the total compression amount is changed, so that the pressure is changed, the pressure is increased when the two cutters cut the bridge plug pin again, a secondary pressurization test is carried out, the detection effect is further improved, the shape and the size of a pin sample can better meet the test requirements through secondary cutting, and the test efficiency is improved. The test error caused by the irregular sample is reduced, and the real shear strength of the sample is reflected more accurately.

Description

Technical Field

[0001] The present invention relates to the technical field of pin shearing tests, in particular to a bridge plug pin shearing test device and an operating method. Background Art

[0002] Bridge plugs are critical tools in oil and gas well completion and workover operations, primarily used to seal the wellbore or separate different reservoir formations. During the setting and release of the bridge plug, the pin plays a crucial role as a connecting or load-bearing component. Its shear strength and cutting performance directly impact the reliability and safety of the bridge plug.

[0003] In the existing technology, manual testing or simple equipment testing can only complete the test of a single pin each time, which cannot meet the needs of rapid evaluation of pin performance in mass production or R&D stages. At the same time, traditional devices can usually only test the performance of pins under a single load, which leads to inaccurate data. Therefore, secondary cutting is required to make the shape and size of the pin sample more in line with the test requirements and reduce the test errors caused by irregular samples. Summary of the Invention

[0004] The purpose of the present invention is to provide a bridge plug pin cutting test device and operating method to solve the problems raised in the above-mentioned background technology. To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a bridge plug pin cutting test device, comprising a workbench and a drive motor, wherein the surface of the workbench is rotatably connected to a cutting drive mechanism, the drive motor is fixedly connected to the back of the workbench, the back of the workbench is fixedly connected to a pressure adjustment mechanism, the back of the workbench is slidably connected to a cutting mechanism, and an auxiliary mechanism is provided between the workbench and the cutting drive mechanism.

[0005] Preferably, the cutting drive mechanism includes a rotating wheel, which is rotatably connected to the surface of the workbench, a circulating O-shaped groove is opened on the surface of the rotating wheel, a vertical slide groove is fixedly connected to the surface of the workbench, a sliding rod is slidably connected inside the vertical slide groove, and a slide rail is fixedly connected to the surface of the workbench, the sliding rod is slidably connected inside the vertical slide groove, and the sliding rod is also slidably connected inside the circulating O-shaped groove, and the front end of the sliding rod is slidably connected inside the slide rail.

[0006] Preferably, the pressure regulating mechanism includes a hollow rod, which is fixedly connected to the back of the workbench, and the interior of the hollow rod is slidably connected to a sliding rod, and a notch is provided on the surface of the sliding rod, and the interior of the hollow rod is fixedly connected to an inclined slide block, and the inclined slide block is provided in several groups inside the hollow rod, and there is a gap between them, which is set as slide groove one, and the lower end of the slide rod is fixedly connected to a tooth block rod, and the surface of the tooth block rod is fixedly connected to a limiting slider, and the tooth block rod slides in slide groove one in the hollow interior through the limiting slider, and the inner bottom end of the hollow rod is slidably connected to a tooth rod, and the bottom end of the tooth rod is rotatably connected to a connecting rod, and the connecting rod is simultaneously slidably connected to the side of the hollow rod, and the surface of the connecting rod is fixedly connected to a one-way telescopic rod.

[0007] The top end of the sliding box is fixedly connected to the limit slide, and the inner slidable end of the sliding box is slidingly connected to the extrusion rod, and the extrusion rod is fixedly connected to the telescopic end of the one-way telescopic rod. A spring rod is provided between the extrusion rod and the upper end of the sliding sleeve, and the surface of the extrusion rod is fixedly connected to the card block, and the card block is slidably connected to the inside of the limiting slide. The inner bottom end of the sliding box is rotatably connected to the oblique slot rod, and the card block is slidably connected to the inside of the oblique slot rod, and one side of the oblique slot rod is fixedly connected to the transmission block.

[0008] Preferably, the auxiliary mechanism includes an L-shaped support rod, which is fixedly connected to the lower end of the sliding rod. A thin wire placement groove is provided inside the workbench. One side of the workbench is fixedly connected to a support rod, and an inclined groove is provided inside the support rod. The plane of the L-shaped support rod cooperates with the side of the inclined groove to temporarily support the wire used for detection.

[0009] A method for operating a bridge plug pin shearing test device comprises the following steps:

[0010] S1. Place the bridge plug pin between the two cutting knives in the middle of the workbench and start the drive motor to drive the wheel to rotate;

[0011] S2, the sliding rod drives the cutter through the circulating O-groove to perform the first low-pressure cutting on the pin;

[0012] S3, the downward pressure rod pushes the slide rod downward, the tooth block rod engages with the latching gear rod to lift the one-way telescopic rod, increasing the pre-compression amount of the spring rod;

[0013] S4, the cutter performs a second high-pressure cutting to test the shear strength of the pins;

[0014] S5. The auxiliary mechanism releases the wire and determines the surface flatness by whether it is pulled out by the pin.

[0015] In the present invention, when the sliding rod slides, the sliding sleeve and the sliding box are driven to slide at the same time, the sliding box drives the cutter to slide, and the two cutters slide relative to each other at the same time, and the bridge plug pin is subjected to the first cutting test with a relatively low pressure to test the hardness of the bridge plug pin to ensure that the quality of the bridge plug pin is qualified.

[0016] In the present invention, by changing the pre-compression amount of the spring rod, the total compression amount will change accordingly, thereby causing the pressure to change. When the two cutters cut the bridge plug pin again, the pressure will increase, and a secondary pressurization test will be performed to further improve the detection effect. The secondary cutting can make the shape and size of the pin sample more in line with the test requirements, reduce the test error caused by the irregularity of the sample, and more accurately reflect its true shear strength.

[0017] In the present invention, the iron wire in the thin iron wire placement groove falls and enters the surface of the L-shaped support rod, and at the same time slides slightly downward through the inclined groove opened in the support rod. When the surface of the bridge plug pin is relatively flat, the iron wire cannot be pulled out. When the groove on the surface of the bridge plug pin is deep, the iron wire can be pulled out through the groove to remind the staff that the quality of the bridge plug pin is unqualified. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the three-dimensional appearance of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the three-dimensional appearance of the present invention Figure 2 ;

[0020] Figure 3 Schematic diagram of the cutting drive mechanism structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the front structure of the cutting mechanism of the present invention;

[0022] Figure 5 This is a schematic structural diagram of the pressure regulating mechanism of the present invention;

[0023] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the hollow rod of the present invention;

[0024] Figure 7 This is an enlarged structural diagram of the gear block rod of the present invention;

[0025] Figure 8 This is an enlarged structural diagram of the latching gear rod of the present invention;

[0026] Figure 9 This is a schematic side sectional view of the cutting mechanism of the present invention;

[0027] Figure 10 Schematic diagram of the internal structure of the cutting mechanism of the present invention Figure 1 ;

[0028] Figure 11 Schematic diagram of the internal structure of the cutting mechanism of the present invention Figure 2 ;

[0029] Figure 12 It is a schematic diagram of the auxiliary mechanism structure of the present invention.

[0030] In the figure: 1. workbench; 2. drive motor; 3. cutting drive mechanism; 4. pressure regulating mechanism; 5. cutting mechanism; 6. auxiliary mechanism; 31. rotating wheel; 32. circulating O-shaped groove; 33. vertical slide; 34. sliding rod; 35. slide rail; 41. hollow rod; 42. sliding rod; 43. notch; 44. pressing rod; 45. inclined slide block; 46. slide 1; 47. tooth block rod; 48. limiting slider; 49. tooth rod; 410. connecting rod; 411. one-way telescopic rod; 51. sliding box; 52. sliding sleeve; 53. cutting knife; 54. limiting slide; 55. squeezing rod; 56. spring rod; 57. block; 58. oblique groove rod; 59. transmission block; 61. L-shaped support rod; 62. thin iron wire placement groove; 63. support rod; 64. oblique groove. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] See also Figures 1 to 12 The present invention provides a technical solution: a bridge plug pin cutting test device, comprising a workbench 1 and a drive motor 2, the surface of the workbench 1 is rotatably connected to a cutting drive mechanism 3, the drive motor 2 is fixedly connected to the back of the workbench 1, the back of the workbench 1 is fixedly connected to a pressure adjustment mechanism 4, the back of the workbench 1 is slidably connected to a cutting mechanism 5, and an auxiliary mechanism 6 is arranged between the workbench 1 and the cutting drive mechanism 3.

[0033] The cutting drive mechanism 3 includes a rotating wheel 31, which is rotatably connected to the surface of the workbench 1. A circulating O-shaped groove 32 is opened on the surface of the rotating wheel 31. A vertical slide groove 33 is fixedly connected to the surface of the workbench 1. A sliding rod 34 is slidingly connected inside the vertical slide groove 33. A slide rail 35 is fixedly connected to the surface of the workbench 1. The sliding rod 34 is slidingly connected inside the vertical slide groove 33. The sliding rod 34 is also slidingly connected inside the circulating O-shaped groove 32. The front end of the sliding rod 34 is slidingly connected inside the slide rail 35.

[0034] The pressure regulating mechanism 4 includes a hollow rod 41, which is fixedly connected to the back of the workbench 1. The interior of the hollow rod 41 is slidably connected to a slide rod 42, and a notch 43 is provided on the surface of the slide rod 42. The interior of the hollow rod 41 is fixedly connected to an inclined slide block 45. The inclined slide block 45 is provided in several groups inside the hollow rod 41, and there is a gap between them, which is set as a slide groove 46. The lower end of the slide rod 42 is fixedly connected to a tooth block rod 47. The surface of the tooth block rod 47 is fixedly connected to a limit slider 48. The tooth block rod 47 slides in the interior of the hollow rod 41 and the slide groove 46 through the limit slider 48. The inner bottom end of the hollow rod 41 The sliding connection is with a tooth rod 49, and the bottom end of the tooth rod 49 is rotatably connected to a connecting rod 410. The connecting rod 410 is also slidably connected to the side of the hollow rod 41. The surface of the connecting rod 410 is fixedly connected with a one-way telescopic rod 411. By changing the pre-compression amount of the spring rod 56, the total compression amount will change accordingly, thereby causing the pressure to change. When the two cutters 53 cut the bridge plug pin again, the pressure will increase, and a secondary pressurization test will be performed to further improve the detection effect. The secondary cutting can make the shape and size of the pin sample more in line with the test requirements, reduce the test error caused by the irregularity of the sample, and more accurately reflect its true shear strength.

[0035] The cutting mechanism 5 includes a sliding box 51, which is slidably connected to the back of the workbench 1. The surface of the sliding box 51 is slidably connected to a sliding sleeve 52, and the sliding sleeve 52 is fixedly connected to the back of the sliding rod 34. The side of the sliding sleeve 52 is fixedly connected to a lower pressure rod 44, and the lower pressure rod 44 is slidably connected inside the notch 43. The bottom of the sliding box 51 is fixedly connected to a cutting knife 53. The interior of the sliding box 51 is fixedly connected to a limiting slide 54, and the interior of the limiting slide 54 is slidably connected to an extrusion rod 55. The extrusion rod 55 is fixedly connected to the telescopic end of the one-way telescopic rod 411, and the extrusion rod 55 is fixedly connected to the upper end of the inner part of the sliding sleeve 52. A spring rod 56 is arranged between them, and a block 57 is fixedly connected to the surface of the extrusion rod 55. The block 57 is also slidably connected inside the limiting slide groove 54. The inner bottom end of the sliding box 51 is rotatably connected to the bevel rod 58, and the block 57 is slidably connected inside the bevel rod 58. A transmission block 59 is fixedly connected to one side of the bevel rod 58. When the sliding rod 34 slides, the sliding sleeve 52 and the sliding box 51 are driven to slide at the same time. The sliding box 51 drives the cutter 53 to slide, and the two cutters 53 slide relative to each other at the same time, and the bridge plug pin is subjected to the first cutting test with a smaller pressure to test the hardness of the bridge plug pin to ensure the quality of the bridge plug pin.

[0036] The auxiliary mechanism 6 includes an L-shaped support rod 61, which is fixedly connected to the lower end of the sliding rod 34. A thin wire placement groove 62 is provided inside the workbench 1. A support rod 63 is fixedly connected to one side of the workbench 1. An inclined groove 64 is provided inside the support rod 63. The plane of the L-shaped support rod 61 cooperates with the side of the inclined groove 64 to temporarily support the detection wire. The wire falls through the thin wire placement groove 62 and enters the surface of the L-shaped support rod 61. At the same time, it slides slightly downward through the inclined groove 64 provided in the support rod 63. When the surface of the bridge plug pin is relatively flat, the wire cannot be brought out. When the groove on the surface of the bridge plug pin is deep, the wire can be brought out through the groove to remind the staff that the quality of the bridge plug pin is unqualified.

[0037] The use method and advantages of the present invention: The bridge plug pin cutting test device and operation method, when used, the working process is as follows:

[0038] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 、 Figure 12 As shown;

[0039] A method for operating a bridge plug pin shearing test device comprises the following steps:

[0040] S1. First, the bridge plug pin is smoothly transferred to the central positioning area of ​​the workbench 1 by the robotic arm to ensure that it is accurately placed in the predetermined gap between the two cutting knives 53. Then the driving motor 2 is started to drive the wheel 31 to rotate at a constant speed. The circulating O-shaped groove 32 on the wheel pushes the sliding rods 34 on both sides to perform synchronous reciprocating motion in the vertical slide groove 33 through the cam mechanism. The sliding rod 34 drives the sliding sleeve 52 and the sliding box 51 to slide smoothly along the precision linear slide rail 35 through the rigid connection, so that the two high-hardness cutting knives 53 move toward each other synchronously at a preset low pressure. The bridge plug pin is subjected to the first progressive light pressure cutting test to test the hardness of the bridge plug pin to ensure the quality of the bridge plug pin.

[0041] S2. When the sliding sleeve 52 begins to move downward under the action of the drive mechanism, its lower end drives the downward pressure rod 44 downward synchronously through the rigid connection. The downward pressure rod 44 slides smoothly along the precision guide rail on the inner wall of the slot 43 until its bottom limit surface fully contacts the bottom stop surface of the slot 43. During this process, the thrust of the downward pressure rod 44 is evenly transmitted to the upper end of the sliding rod 42 through the contact surface, forcing the sliding rod 42 to produce precise linear displacement within the composite guide channel formed by the slide groove 46 and the inclined slide block 45. As the sliding rod 42 continues to move downward, the tooth block rod 47 connected to its lower end also moves downward. The 45° inclined wedge surface designed on the front section of the tooth block rod 47 begins to gradually contact the corresponding inclined surface of the latching gear rod 49. Due to the initial constraint of the inclined slide block 45 on the latching gear rod 49, the latching gear rod 49 begins to experience gradually increasing lateral pressure. When the gear rod 47 moves downward to the critical position, the horizontal component of force exerted by its inclined surface on the latching gear rod 49 completely overcomes the preload of the return spring at the bottom of the latching gear rod 49, forcing the latching gear rod 49 to move radially outward, ultimately causing its locking boss to completely disengage from the restraining groove of the inclined surface chute block 45. After the mechanism reaches bottom dead center, as the sliding sleeve 52 begins its return stroke, the lower pressure rod 44 rises accordingly. At this point, under the restoring force of the spring at the bottom, the inclined surface of the latching gear rod 49 slides relative to the guide surface of the inclined surface chute block 45. Due to the precise design of the mechanism's geometrical relationships, the latching gear rod 49 undergoes radial displacement during the return stroke, allowing its locking end to precisely fall into the positioning groove of chute 1 46. At the end of the return stroke, the lower pressure rod 44, through the sliding rod 42, exerts an upward pulling force on the latching gear rod 49. Since the latching gear rod 49 is now in its new positioning position, the entire locking mechanism is ultimately positioned at a precise height, one tooth pitch higher than its initial position, achieving reliable stepped positioning with a fixed distance and constant pressure.

[0042] S3. When the toothed rod 49 moves upward under the action of the return spring, the connecting rod 410 connected to the top thereof by a pin rises synchronously therewith, and the upper end is rigidly connected to the one-way telescopic rod 411 by a precision thread. The one-way telescopic rod 411 moves upward smoothly in the guide sleeve, and the ratchet mechanism arranged inside it ensures the unidirectional movement to prevent accidental fall back. As the one-way telescopic rod 411 rises, its top pushes the extrusion rod 55 to move vertically upward in the limiting slide groove 54 through the ball joint. The upward movement of the extrusion rod 55 synchronously compresses the spring rod 56. The spring rod adopts a progressive variable pitch design. The stiffness is small in the initial compression stage. As the compression amount increases, the stiffness gradually increases, thereby realizing precise control of the pressure change. The block 57 is precisely matched with the guide groove of the inclined slot rod 58. When the block 57 moves upward, the inclined slot rod 58 is forced to rotate by the action of the inclined surface. The rotation of the inclined slot rod 58 The transmission block 59 is driven to rotate synchronously by the connecting rod. The surface of the transmission block 59 has been specially hardened to ensure wear resistance when in contact with the extrusion rod 55. When the transmission block 59 is rotated into place, its arc-shaped support surface is just below the pressure-bearing platform at the lower end of the extrusion rod 55, forming a rigid support structure. At this time, the system completes the pressure adjustment preparation, the pre-compression amount of the spring rod 56 has increased, and the overall stiffness is improved. When the cutter 53 performs the downward action again, due to the change in the energy storage state of the spring system, the maximum cutting pressure applied by the two cutters 53 to the bridge plug pin increases, and a secondary pressurization test is performed to further improve the detection effect. The secondary cutting can make the shape and size of the pin sample more in line with the test requirements, reduce the test error caused by the irregularity of the sample, and more accurately reflect its true shear strength, thereby ensuring that the bridge plug can smoothly shear the pin under the designed working pressure and achieve hand-release sealing.

[0043] When the sliding sleeve 52 moves downward again, it drives the pressing rod 44 to slide downward and presses the sliding rod 42 downward at the same time. When the sliding rod 42 is squeezed, it slides downward between the slide groove 1 46 and the inclined slide block 45 and drives the tooth block rod 47 to slide downward at the same time. Half of the inclined surface of the tooth block rod 47 squeezes the gear rod 49. When the gear rod 49 is squeezed, it will be squeezed out of the inclined slide block 45 and separated from the inclined slide block 45. When the gear rod 49 rebounds through the spring at the bottom, the inclined surface of the gear rod 49 will slide through the inclined surface of the inclined slide block 45 to the position between the inclined surfaces of the inclined slide block 45, the initial state.

[0044] S5. Finally, the robotic arm moves again, and the wire in the thin wire placement groove 62 falls and enters the surface of the L-shaped support rod 61. At the same time, it slides slightly downward through the inclined groove 64 opened in the support rod 63. When the surface of the bridge plug pin is relatively flat, the wire cannot be brought out. When the groove on the surface of the bridge plug pin is deep, the wire can be brought out through the groove to remind the staff that the quality of the bridge plug pin is unqualified. At the same time, automated detection can accurately control the detection process and reduce sample damage or waste of consumables due to improper manual operation.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and modifications fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A bridge plug pin cutting and testing device, comprising a workbench (1) and a drive motor (2), characterized in that: The surface of the workbench (1) is rotatably connected to a cutting drive mechanism (3), a drive motor (2) is fixed to the back of the workbench (1), a pressure adjustment mechanism (4) and a slidingly connected cutting mechanism (5) are fixedly connected to the back of the workbench (1), and an auxiliary mechanism (6) is provided between the workbench (1) and the cutting drive mechanism (3).

2. A bridge plug pin shearing test device according to claim 1, characterized in that: The cutting drive mechanism (3) comprises a rotating wheel (31), a circulating O-shaped groove (32), a vertical slide groove (33), a sliding rod (34) and a slide rail (35). The rotating wheel (31) is rotatably connected to the surface of the workbench (1) and drives the sliding rod (34) to slide in the vertical slide groove (33) through the circulating O-shaped groove (32). The front end of the sliding rod (34) is slidably matched with the slide rail (35).

3. A bridge plug pin shearing test device according to claim 2, characterized in that: The pressure regulating mechanism (4) comprises a hollow rod (41), a sliding rod (42), an inclined sliding groove block (45) and a latching gear rod (49); the sliding rod (42) is linked to the pressing rod (44) through a notch (43); and the latching gear rod (49) is connected to the one-way telescopic rod (411) through a connecting rod (410).

4. A bridge plug pin cutting test device according to claim 3, characterized in that: The cutting mechanism (5) comprises a sliding box (51), a cutting knife (53) and a spring rod (56); the sliding box (51) is connected to the sliding rod (34) via a sliding sleeve (52); the pre-compression amount of the spring rod (56) is adjusted by an extrusion rod (55); and the auxiliary mechanism (6) comprises an L-shaped support rod (61), a thin wire placement groove (62) and a support rod (63) with an oblique groove (64), which is used to detect the flatness of the pin surface.

5. The bridge plug pin shearing test device according to claim 4, characterized in that: In the pressure regulating mechanism (4), the slide rod (42) cooperates with the tooth rod (49) through the tooth block rod (47), and the limit slide block (48) slides in the slide groove (46) to achieve pressure graded regulation.

6. The bridge plug pin shearing test device according to claim 5, characterized in that: The cutting mechanism (5) further comprises an oblique slot rod (58) and a transmission block (59). The oblique slot rod (58) is linked to the extrusion rod (55) via a clamping block (57). The transmission block (59) is used to lock the position of the extrusion rod (55) to change the compression amount of the spring rod (56).

7. The method for operating the bridge plug pin shearing test device according to claim 6, characterized in that: In the auxiliary mechanism (6), the L-shaped support rod (61) cooperates with the inclined groove (64), and the iron wire released from the thin iron wire placement groove (62) is brought out through the groove on the pin surface to indicate quality defects.

8. A method for operating a bridge plug pin shearing test device, using the bridge plug pin shearing test device according to claim 7, characterized in that: The steps include: S1. Place the bridge plug pin between the two cutting knives (53) in the middle of the workbench (1), and start the drive motor (2) to drive the rotating wheel (31) to rotate; S2, the sliding rod (34) drives the cutting knife (53) through the circulating O-shaped groove (32) to perform the first low-pressure cutting on the pin; S3, the pressing rod (44) pushes the slide rod (42) downward, the tooth block rod (47) engages with the latching tooth rod (49) to lift the one-way telescopic rod (411), and the pre-compression amount of the spring rod (56) is increased; S4, the cutting knife (53) performs a second high-pressure cutting to test the shear strength of the pins; S5. The auxiliary mechanism (6) releases the wire and determines the surface flatness by whether the wire is pulled out by the pin.

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