On-site drilling method for the center of the crank pin of a beam pumping unit

Abstract

A method for on-site drilling of the center of the crank pin of a beam pumping unit, wherein the bottom plate of the drilling device involved is rectangular, a center hole is provided on the left side, a guide sleeve is provided in the center hole, long groove-type clamping holes and fixing holes are evenly distributed on two concentric outer circles of the center guide hole of the guide sleeve, four threaded holes are provided on the right side of the guide hole for installing a bench drill, a support frame is provided at the lower part of the threaded hole, two top screws are provided at both ends of the support frame, a rib plate is provided in the middle and lower part of the support frame for strengthening support, a rubber pad is provided between the bottom plate and the end face of the crank pin, a magnetic seat drill is provided at the position of the four threaded holes on the upper part of the support frame, and is sucked together with the bottom plate by an electromagnetic suction cup, and the magnetic seat of the magnetic seat drill is supported by the top screw. The present invention is particularly suitable for on-site drilling of the center of the crank pin of an oil field beam pumping unit, and is convenient for installing a safety shaft, a pressure guide plate and a force sensor. When the crank pin is broken, the machine overturning accident caused by the crank pin breaking is avoided, materials are saved, production costs are reduced, and crude oil production is increased.

Description

Technical Field

[0001] The invention relates to oil production equipment technology in the petroleum industry, in particular to an on-site drilling operation method for the center of a crank pin of a beam pumping unit. Background Art

[0002] The crank pin of the oil field beam pumping unit is the main component connecting the crank and the connecting rod. In the four-bar linkage, it plays the role of bearing, rotating and connecting, and is an easily damaged component. If the crank pin of the pumping unit is disengaged, the crank pin of the pumping unit will fall out of the crank hole, or if the crank pin has quality defects and mechanical fatigue fracture, it will fall out of the crank hole instantly, and the forces on both sides will be transferred to the single connecting rod on one side. The donkey head load is very large, and the unidirectional force will pull the beam to one side, twist the tail bearing, and cause a rollover accident, resulting in the scrapping of the pumping unit, bending the bare rod, and damaging the wellhead, and causing pollution incidents. A crank pin assembly of an oil pump based on information technology has been developed, with application number: 201910746334.6. When the crank pin of the oil pump is disengaged or broken, the pressure plate generates thrust on the force sensor. The force sensor converts the thrust into an electrical signal and outputs it to the transmitter through a data line. The transmitter transmits the alarm back to the production command center through a wireless signal and stops the operation of the oil pump at the same time, avoiding further damage to the oil pump and the occurrence of overturning accidents, reducing economic losses and increasing crude oil production. This product is suitable for the manufacture or on-site replacement of new oil pump crank pin assemblies, but on-site replacement is a large workload and increases oil production costs. In order to save costs, it is necessary to drill a hole in the center of the existing crank pin to install the safety shaft, pressure plate and force sensor. The existing technology cannot solve the above problems. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a method for on-site drilling of a crank pin center of a beam pumping unit.

[0004] The present invention comprises: a bottom plate, a support frame, a guide sleeve, a rubber pad, an extended drill bit, a bench drill and a magnetic drill; the characteristics are as follows: the bottom plate is rectangular, a center hole is provided on the left side, a guide sleeve is provided in the center hole, the center of the guide sleeve is a guide hole, two concentric outer circles of the guide hole are respectively and evenly provided with long groove type clamping holes and fixing holes, four threaded holes are provided on the right side of the guide hole for installing the bench drill, a support frame is provided at the lower part of the threaded hole, two top screws are provided at both ends of the support frame, a rib plate is provided in the middle and lower part of the support frame for strengthening support, the rubber pad is provided in the middle of the bottom plate and the outer end surface of the crank pin, the magnetic drill is provided at the position of the four threaded holes on the upper part of the support frame, and is sucked together with the bottom plate by an electromagnetic suction cup, and the magnetic base of the magnetic drill is further supported by the top screw.

[0005] The bottom plate in the above-mentioned on-site drilling device for the center of the crank pin of the walking beam pumping unit is a long plate-shaped structure, and the four corners are all rounded or set to 45°.

[0006] The guide sleeve in the above-mentioned on-site drilling device for the center of the crank pin of the walking beam pumping unit is interference-fitted with the center hole on the left side of the bottom plate, and the guide sleeve is made of hard alloy wear-resistant material.

[0007] The guide hole at the center of the guide sleeve in the on-site drilling device for the center of the crank pin of the beam pumping unit is clearance-matched with the extended drill bit.

[0008] The drilling operation method of the on-site drilling device for the center of the crank pin of the beam pumping unit is as follows:

[0009] First, stop the crank of the pumping unit at the bottom dead center, apply the brake and cut off the power supply of the pumping unit;

[0010] Second, if a bench drill is used for drilling, remove the crank pin bearing end cover, bearing baffle, and connecting rod fixing bolts, place the rubber pad between the base plate and the end face of the crank pin, fix the bench drill to the base plate through the bench drill fixing screws, and align the extended drill bit with the guide hole, then pass the four crank pin bearing end cover fixing screws through the clamping holes to press the base plate onto the crank pin assembly seat of the oil pump, and then further fix it with four connecting rod fixing bolts through the fixing holes. The direction of the base plate should be suitable for convenient operation by personnel, start the bench drill to drill, add coolant during the drilling process, and retract the drill to remove chips several times until the safety shaft through hole in the center of the crank pin is opened.

[0011] Third, if a magnetic drill is used for drilling, place the rubber pad between the base plate and the end face of the crank pin, connect the base plate to the crank pin assembly seat of the oil pump through the four crank pin bearing end cover fixing screws through the clamping hole, and then further tighten the connection through the four connecting rod fixing bolts through the fixing holes. Then adsorb the magnetic drill on the base plate, adjust the height of the magnetic drill through the top screw, and adjust the magnetic drill so that the extended drill bit is centered with the guide hole, start the magnetic drill to drill, lubricate and cool with coolant during the drilling process, and repeatedly back off the drill to remove chips to drill through the safety shaft through the center of the crank pin.

[0012] The beneficial effects of the present invention are as follows: the present invention is suitable for on-site drilling of the crank pin center of an oil field walking beam pumping unit, and is convenient for installing a safety shaft, a pressure plate, and a force sensor. When the crank pin is broken off, a thrust is generated on the force sensor through the pressure plate, and the force sensor converts the thrust into an electrical signal and outputs it to the transmitter through a data line. The transmitter transmits an alarm back to the production command center through a wireless signal, and at the same time stops the operation of the pumping unit, thereby avoiding the occurrence of a rollover accident caused by the crank pin breaking off, saving materials, reducing production costs, and increasing crude oil production. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0014] Figure 1 - Main structural diagram of the present invention

[0015] Figure 2 - A schematic diagram of a partial cross-section structure of a bench drill used on site to drill a hole in the present invention

[0016] Figure 3 - A partial cross-sectional view of the present invention showing the on-site use of a magnetic drill for drilling holes

[0017] Figure 4 - The present invention relates to a schematic diagram of the application structure of a crank pin drilling for a beam pumping unit

[0018] The markings in the attached drawings are: 1. Base plate, 2. Support frame, 2-1. Rib plate, 2-2. Top screw, 3. Guide sleeve, 4. Rubber pad, 5. Extended drill bit, 6. Bench drill, 6-1. Bench drill seat, 6-2. Bench drill fixing screw, 7. Magnetic base drill, 7-1 magnetic base, 7-2. Electromagnetic suction cup, 8. Connecting rod connecting plate, 8-1. Connecting rod fixing bolt, 9. Crank, 10. Pumping unit crank pin assembly seat, 11. Crank pin, 12. Crown nut, 13. Safety shaft, 14. Pressure guide plate, 15. Transmitter, 16. Data cable, 17. Force sensor, 18. Safety nut, 19. Crank pin bearing end cover, 19-1. Crank pin bearing end cover fixing screw, 20. Bearing baffle; G. Fixing hole, M. Threaded hole, Q. Clamping hole, S. Safety shaft through hole, Z. Guide hole. DETAILED DESCRIPTION

[0019] The on-site drilling device for the center of the crank pin of a walking beam pumping unit consists of a base plate 1, a support frame 2, a guide sleeve 3, a rubber pad 4, an extended drill bit 5, a bench drill 6, and a magnetic base drill 7; the characteristic is that the base plate 1 is rectangular, a center hole is provided on the left side, a guide sleeve 3 is provided in the center hole, the center of the guide sleeve 3 is a guide hole Z, two concentric outer circles of the guide hole Z are respectively evenly distributed with long groove type clamping holes Q and fixing holes G, four threaded holes M are provided on the right side of the guide hole Z for installing the bench drill 6, a support frame 2 is provided at the lower part of the threaded hole M, two top screws 2-2 are provided at both ends of the support frame 2, a rib plate 2-1 is provided in the middle and lower part of the support frame 2 for strengthening support, the rubber pad 4 is provided in the middle of the base plate 1 and the outer end surface of the crank pin 11, the magnetic base drill 7 is provided at the position of the four threaded holes on the upper part of the support frame 2, and is sucked together with the base plate 1 through an electromagnetic suction cup 7-2, and the magnetic base 7-1 of the magnetic base drill 7 is further supported by the top screw 2-2.

[0020] The bottom plate 1 is a long plate-shaped structure, and the four corners are rounded or set to 45°.

[0021] The guide sleeve 3 is interference fit with the hole at the left center of the bottom plate 1 , and the guide sleeve 3 is made of hard alloy wear-resistant material.

[0022] The guide hole Z at the center of the guide sleeve 3 and the extended drill bit 5 are clearance-fitted.

[0023] The drilling operation method of the on-site drilling device for the center of the crank pin of the beam pumping unit is as follows:

[0024] First, stop the crank 9 of the pumping unit at a position close to the bottom dead center, apply the brake and cut off the power supply of the pumping unit;

[0025] Second, if the bench drill 6 is used for drilling, remove the crank pin bearing end cover 19, the bearing baffle 20, and the connecting rod fixing bolt 8-1, place the rubber pad 4 between the base plate 1 and the end face of the crank pin 11, fix the bench drill 6 on the base plate 1 through the bench drill fixing screws 6-2, and align the extended drill bit 5 with the guide hole Z, then press the base plate 1 on the crank pin assembly seat 10 of the oil pumping unit through the four crank pin bearing end cover fixing screws 19-1 through the clamping hole Q, and then further fix it through the four connecting rod fixing bolts 8-1 through the fixing hole G. The direction of the base plate 1 should be suitable for convenient operation by personnel, start the bench drill 6 to drill, add coolant during the drilling process, and back off the drill to remove chips several times until the safety shaft through hole S in the center of the crank pin 11 is opened.

[0026] Third, if a magnetic drill 7 is used for drilling, the rubber pad 4 is placed between the end faces of the bottom plate 1 and the crank pin 11, and the bottom plate 1 is connected to the crank pin assembly seat 10 of the oil pumping unit through the four crank pin bearing end cover fixing screws 19-1 through the clamping hole Q, and then the four connecting rod fixing bolts 8-1 are passed through the fixing hole G for further tightening connection, and then the magnetic drill 7 is adsorbed on the bottom plate 1, and the height of the magnetic drill 7 is adjusted by the top screw 2-2 and the magnetic drill 7 is adjusted so that the extended drill bit 5 is centered with the guide hole Z, and the magnetic drill 7 is started for drilling. During the drilling process, the coolant is used for lubrication and cooling, and the drill is repeatedly withdrawn and chip removal is performed to drill through the safety shaft through hole S in the center of the crank pin 11.

[0027] Fourth, pass the safety shaft 13 through the center hole S of the crank pin 11, install the pressure plate 14 and the force sensor 17 on the left end of the safety shaft 13 in sequence, tighten the safety nut 18, and connect the force sensor 17 to the transmitter 15 through the data line 16.

[0028] Fifth, tighten the bearing baffle 20 and the crank pin bearing end cover 19.

[0029] Sixth, close the switch, supply power, release the brake, press the start button, and use inertia to start the oil pump.

[0030] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for on-site drilling of the crank pin center of a beam pumping unit, the operating steps are as follows: First, the crank (9) of the pumping unit is stopped at a position close to the bottom dead center, the brake is applied and the power supply of the pumping unit is cut off; Second, if a bench drill (6) is used for drilling holes, remove the crank pin bearing end cover (19), the bearing baffle (20), and the connecting rod fixing bolt (8-1), place the rubber pad (4) between the bottom plate (1) and the end face of the crank pin (11), fix the bench drill (6) to the bottom plate (1) through the bench drill fixing screw (6-2), and align the extended drill bit (5) with the guide hole (Z), then pass the four crank pin bearing end cover fixing screws (19-1) through the clamping hole (Q) to press the bottom plate (1) onto the crank pin assembly seat (10) of the pumping unit, and then pass the four connecting rod fixing bolts (8-1) through the fixing hole (G) for further fixing. The direction of the bottom plate (1) should be suitable for convenient operation by personnel, start the bench drill (6) to drill holes, add coolant during the drilling process, and perform chip removal by retracting the drill several times until the safety shaft through hole (S) in the center of the crank pin (11) is opened; Third, if a magnetic drill (7) is used for drilling, the rubber pad (4) is placed between the end faces of the bottom plate (1) and the crank pin (11), and the bottom plate (1) is connected to the crank pin assembly seat (10) of the pumping unit through the four crank pin bearing end cover fixing screws (19-1) passing through the clamping hole (Q), and then the four connecting rod fixing bolts (8-1) are passed through the fixing hole (G) for further tightening. Then the magnetic drill (7) is adsorbed on the bottom plate (1), and the height of the magnetic drill (7) is adjusted by the top screw (2-2), and the magnetic drill (7) is adjusted so that the extended drill bit (5) is aligned with the guide hole (Z), and the magnetic drill (7) is started to drill. During the drilling process, the coolant is used for lubrication and cooling, and the drill is repeatedly withdrawn to remove chips to drill through the safety shaft through hole (S) in the center of the crank pin (11); The above-mentioned on-site drilling operation method for the crank pin center of the beam pumping unit, wherein the drilling device comprises: A base plate (1), a support frame (2), a guide sleeve (3), a rubber pad (4), an extended drill bit (5), a bench drill (6), and a magnetic base drill (7); characterized in that: the base plate (1) is rectangular, a center hole is provided on the left side, a guide sleeve (3) is provided in the center hole, the center of the guide sleeve (3) is a guide hole (Z), two concentric outer circles of the guide hole (Z) are respectively evenly provided with long groove type clamping holes (Q) and fixing holes (G), and four threaded holes (M) are provided on the right side of the guide hole (Z) for installing the bench drill ( 6), a support frame (2) is provided at the lower part of the threaded hole (M), two top screws (2-2) are provided at both ends of the support frame (2), a rib plate (2-1) is provided at the middle and lower part of the support frame for reinforcing support, a rubber pad (4) is provided between the bottom plate (1) and the outer end surface of the crank pin (11), a magnetic base drill (7) is provided at the position of the four threaded holes on the upper part of the support frame (2), and is sucked together with the bottom plate (1) by an electromagnetic suction cup (7-2), and the magnetic base (7-1) of the magnetic base drill (7) is further supported by the top screw (2-2).

2. The method for on-site drilling of the crank pin center of a beam pumping unit according to claim 1 is characterized in that: The bottom plate (1) of the punching device is a long plate-shaped structure, and the four corners are all rounded or set to 45°.

3. The method for on-site drilling of the crank pin center of a beam pumping unit according to claim 1 is characterized in that: The guide sleeve (3) of the punching device is interference-fitted with the hole at the center of the left side of the base plate (1), and the guide sleeve (3) is made of hard alloy wear-resistant material.

4. The method for on-site drilling of the crank pin center of a beam pumping unit according to claim 1 is characterized in that: The guide hole (Z) at the center of the guide sleeve (3) of the punching device and the extended drill bit (5) are clearance-matched.

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