Online cleaning device for bearing box of direct-drive screw pump

Abstract

The invention relates to the technical field of oil field oil extraction mechanical equipment, in particular to an online cleaning device for a direct-drive screw pump bearing box. The cleaning device comprises a protective cover and an air pump, a motor is mounted at the lower end of the protective cover, a bearing box is mounted at the lower end of the motor, a bearing is mounted in the bearing box, a Christmas tree is mounted at the lower end of the bearing box, a scavenging assembly, an oil discharge assembly and a nozzle pipe are mounted on the bearing box, the nozzle pipe is arranged at the lower end of the scavenging assembly, and the oil discharge assembly is arranged at the lower end of the nozzle pipe. The air pump is connected with the scavenging assembly or the oil discharge assembly, and the nozzle pipe is connected with the rotary connector. The cleaning device provided by the invention is safe, reliable, convenient and rapid in operation process, can thoroughly remove deteriorated lubricating oil adhered to the inner wall of the bearing box and the bearing, effectively avoids the problem of long downtime of the screw pump caused by slow pollution discharge, ensures the crude oil yield, prolongs the service life of the bearing, reduces the failure rate of the bearing box of the screw pump, and improves the working efficiency. The oil pumping time rate is improved; and the oil yield is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of oilfield oil production mechanical equipment, and particularly to an on-line cleaning device for a direct drive screw pump bearing box. Background Art

[0002] The direct drive screw pump is an oil production mechanical equipment in the petroleum industry. It has a simple structure, high efficiency and energy saving, and has been widely used in many oilfields in China, and its application scale is also expanding year by year.

[0003] To ensure the normal production of the direct drive screw pump, lubricating oil needs to be added to the bearing box of the direct drive screw pump to lubricate and cool the bearings. As the service time of the screw pump increases, the lubricating oil in the bearing box will deteriorate due to high temperature and oxidation. If not replaced in time, it will accelerate bearing wear, affect its service life and pose potential safety hazards in production. At present, the commonly used method for replacing lubricating oil on site is to open the plug of the oil filling hole at the top of the bearing box and the plug of the oil drain hole at the bottom, and drain the deteriorated lubricating oil under the action of gravity, and then add new lubricating oil. However, the deteriorated lubricating oil adhering to the bearing surface and the inner wall of the bearing box cannot be drained completely, resulting in the mixing of the newly added lubricating oil and the residual deteriorated lubricating oil, accelerating the deterioration of the lubricating oil. This greatly shortens the lubricating oil replacement cycle and seriously affects the normal production of the direct drive screw pump. To solve the problem of residual deteriorated lubricating oil, the oilfield has proposed a hot washing method to improve the removal effect of the deteriorated lubricating oil by injecting hot steam. However, this method cannot completely remove the deteriorated lubricating oil, and the residual water in the bearing box after hot washing will also contaminate the replaced lubricating oil and accelerate its deterioration. Therefore, there is still no reliable measure for cleaning the deteriorated lubricating oil in the bearing box on site. Therefore, in view of the above deficiencies, an on-line cleaning device for a direct drive screw pump bearing box is proposed. Summary of the Invention

[0004] (1) Technical Problems to be Solved The present invention provides an on-line cleaning device for a direct drive screw pump bearing box to overcome the defects of poor cleaning effect, new impurities being incorporated in the prior art, resulting in re-contamination of the newly replaced lubricating oil, high production cost, excessive labor intensity of workers for replacing lubricating oil, low bearing service life, high failure rate of the direct drive screw pump, low oil pumping rate and low oil production rate.

[0005] (2) Technical Solutions To solve the above problems, the present invention provides an on-line cleaning device for a direct drive screw pump bearing box, including: Protective cover and air pump. The motor is installed at the lower end of the protective cover, the bearing box is installed at the lower end of the motor, the bearing is installed inside the bearing box, the Christmas tree is installed at the lower end of the bearing box, the scavenging assembly, the oil drainage assembly and the nozzle pipe are installed on the bearing box. The lower end of the scavenging assembly is the nozzle pipe, and the lower end of the nozzle pipe is the oil drainage assembly. The air pump is connected to the scavenging assembly or the oil drainage assembly, and the nozzle pipe is connected to the rotary joint; The cleaning agent is added to the bearing box through an oil filling tool. The speed of the dirty oil discharge is controlled by the scavenging assembly in the bearing box. The angle of the nozzle pipe is adjusted by the rotary joint. The nozzle pipe realizes 360° cleaning by adjusting the depth and angle inserted into the bearing box. Both the oil drainage assembly and the scavenging assembly can control the air intake of the air pump. The gas input by the air pump is used to clean the inner wall of the bearing box and the bearing by mixing with the cleaning agent. The dirty oil after cleaning is discharged from the bearing box through the oil drainage assembly.

[0006] Preferably, an oil filling hole, an oil drainage hole and an oil level viewing window are provided at the upper end of the bearing box. The outer wall of the bearing box is provided with an oil filling hole and an oil drainage hole. The oil filling hole is connected to the flushing line assembly, the oil drainage hole is connected to the oil drainage assembly. The lower end of the oil filling hole is the oil drainage hole, and one side of the oil filling hole is the oil level viewing window.

[0007] Preferably, an oil filling hole plug is installed on the bearing box through the oil filling hole, and an oil drainage hole plug is installed on the bearing box through the oil drainage hole.

[0008] Preferably, the scavenging assembly includes a short tee, a flushing line joint, a flushing line valve and an exhaust valve. The bottom end of the short tee is connected to the oil filling hole of the bearing box. The flushing line valve and the exhaust valve are respectively installed on both sides of the short tee. The other end of the flushing line valve is connected to the flushing line joint.

[0009] Preferably, the flushing line joint is connected to the air pump. The flushing line valve controls the gas of the air pump to enter the bearing box, and the speed of the dirty oil discharge is controlled by adjusting the opening degree of the flushing line valve.

[0010] Preferably, the oil drainage assembly includes a short tee, an oil drainage valve, a cleaning valve and a gas supply joint. The lower end of the short tee is connected to the oil drainage hole of the bearing box. The two ends of the short tee are respectively the oil drainage valve and the cleaning valve. The other end of the cleaning valve is connected to the gas supply joint.

[0011] Preferably, the gas supply joint is connected to the air pump. The intake air flow of the air pump is controlled by adjusting the cleaning valve, and the mixture of the dirty oil and the cleaning agent after cleaning is discharged through the oil drainage valve.

[0012] Preferably, the air pump includes an air pump main body and an air pump power cord. The air pump main body is connected to the distribution box through the air pump power cord, and the distribution box is connected to the leakage protector through the power cord.

[0013] (III) Beneficial effects The on-line cleaning device for the bearing box of the direct-drive screw pump provided by the present invention is safe, reliable, convenient and fast in the operation process, can thoroughly remove the deteriorated lubricating oil adhering to the inner wall of the bearing box and the bearing, effectively avoids the problem of long downtime of the screw pump caused by slow sewage discharge, ensures the crude oil output, prolongs the service life of the bearing, reduces the failure rate of the bearing box of the screw pump, and improves the pumping time rate and increases the oil output. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is the first structural schematic diagram of the on-line cleaning device for the bearing box of the direct-drive screw pump of the present invention; Figure 2 is the second structural schematic diagram of the on-line cleaning device for the bearing box of the direct-drive screw pump of the present invention.

[0015] Legend: 1 - protective cover; 2 - motor; 3 - plug for oil filling hole; 4 - plug for oil drain hole; 5 - Christmas tree; 6 - oil level viewing window; 7 - bearing box; 8 - pipeline flushing joint; 9 - pipeline flushing valve; 10 - exhaust valve; 11 - nozzle pipe; 12 - rotary joint; 13 - oil drain valve; 14 - cleaning valve; 15 - gas supply joint. EMBODIMENTS

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0017] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by "upper", "lower", "inner", "outer", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. The purpose is only to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0018] Figure 1 is the first structural schematic diagram of the on-line cleaning device for the bearing box of the direct-drive screw pump of the present invention, Figure 2 is the second structural schematic diagram of the on-line cleaning device for the bearing box of the direct-drive screw pump of the present invention, as Figure 1 and Figure 2As shown in the figure, an on-line cleaning device for a direct-drive screw pump bearing box provided by the present invention specifically includes: a protective cover 1 and an air pump. The lower end of the protective cover 1 is equipped with a motor 2. The lower end of the motor 2 is equipped with a bearing box 7. Bearings are installed inside the bearing box 7. The lower end of the bearing box 7 is equipped with a Christmas tree 5. A scavenging assembly, an oil drainage assembly and a nozzle pipe 11 are installed on the bearing box 7. The lower end of the scavenging assembly is the nozzle pipe 11. The lower end of the nozzle pipe 11 is the oil drainage assembly. The air pump is connected to the scavenging assembly or the oil drainage assembly. The nozzle pipe 11 is connected to a rotary joint 12.

[0019] In practical applications, the bearing box 7 adds cleaning agent through an oil filling tool. The bearing box 7 controls the sewage oil discharge speed through the scavenging assembly. The rotary joint 12 adjusts the angle of the nozzle pipe 11 through rotation. The nozzle pipe 11 realizes 360° cleaning by adjusting the depth and angle of insertion into the bearing box 7. Both the oil drainage assembly and the scavenging assembly can control the air intake of the air pump. The gas input by the air pump is used to clean the inner wall of the bearing box 7 and the bearings by mixing with the cleaning agent. The bearing box 7 discharges the cleaned sewage oil through the oil drainage assembly.

[0020] In this cleaning device, the upper end of the bearing box 7 is provided with an oil filling hole, an oil drainage hole and an oil level sight glass 6. The outer wall of the bearing box 7 is provided with an oil filling hole and an oil drainage hole. The oil filling hole is connected to the scavenging line assembly. The oil drainage hole is connected to the oil drainage assembly. The lower end of the oil filling hole is the oil drainage hole. One side of the oil filling hole is the oil level sight glass 6. In addition, the bearing box 7 installs an oil filling hole plug 3 through the oil filling hole, and the bearing box 7 installs an oil drainage hole plug 4 through the oil drainage hole.

[0021] In practical applications, the scavenging assembly includes a short joint tee, a scavenging line joint 8, a scavenging valve 9 and an exhaust valve 10. The bottom end of the short joint tee is connected to the oil filling hole of the bearing box 7. The scavenging valve 9 and the exhaust valve 10 are respectively installed on both sides of the short joint tee. The other end of the scavenging valve 9 is connected to the scavenging line joint 8.

[0022] In this cleaning device, the oil drainage assembly includes a short joint tee, an oil drainage valve 13, a cleaning valve 14 and a gas supply joint 15. The lower end of the short joint tee is connected to the oil drainage hole of the bearing box 7. The two ends of the short joint tee are respectively the oil drainage valve 13 and the cleaning valve 14. The other end of the cleaning valve 14 is connected to the gas supply joint 15.

[0023] In practical applications, the scavenging line joint 8 is connected to the air pump. The scavenging valve 9 controls the gas of the air pump to enter the bearing box 7, and controls the sewage oil discharge speed by adjusting the opening degree of the scavenging valve 9; the gas supply joint 15 is connected to the air pump. The air intake flow of the air pump is controlled by adjusting the cleaning valve 14, and the mixture of the cleaned sewage oil and the cleaning agent is discharged through the oil drainage valve 13.

[0024] In this cleaning device, the air pump includes an air pump main body and an air pump power cord. The air pump main body is connected to the distribution box through the air pump power cord. The distribution box is connected to the leakage protector through the power cord. The air pump main body is provided with an air pump outlet joint, and the air pump is connected to the line sweeping joint 8 or the air supply joint 15 through the air pump outlet joint.

[0025] In practical applications, the nozzle pipe 11 is provided with an air outlet. The air outlet of the nozzle pipe 11 has a certain inclination angle, and the range of the inclination angle is about 30°-60°, which enhances the shear force of the airflow inside the bearing box 7. The angle of the air outlet of the nozzle pipe 11 is adjusted synchronously through the rotation of the rotary joint 12. The nozzle pipe 11 can adjust the depth of insertion into the bearing box 7 through the air outlet. The nozzle pipe 11 realizes 360° cleaning by adjusting the depth and angle of insertion into the bearing box 7.

[0026] In this cleaning device, an air pump is used as the air source. The air pump is connected to the line sweeping joint 8 of the line sweeping assembly. The air pump is turned on during the gravity sewage discharge process to increase the pressure inside the bearing box 7 and improve the discharge speed of the deteriorated lubricating oil. The intake air volume is adjusted through the cleaning valve 14 installed on the oil drain hole. The gas is injected into the bearing box 7 through the nozzle pipe 11 and is fully mixed with the added cleaning agent. The addition of the gas can make the cleaning agent fully foam. Moreover, the inclination angle set at the air outlet of the nozzle pipe 11 generates a strong shear force at the inner wall of the bearing box 7, enhancing the cleaning effect on the adhered lubricating oil. At the same time, after running for a period of time, by adjusting the angle of the rotary joint 12, the air outlet of the nozzle pipe 11 can be synchronously rotated at multiple angles, and the depth of insertion of the nozzle pipe 11 into the bearing box 7 can be adjusted at the same time, realizing a 360-degree full-angle and non-dead-angle cleaning of the adhered deteriorated lubricating oil inside the bearing box 7. The intake air volume is adjusted through the line sweeping valve 9 installed on the oil filling hole, so that the gas is injected into the bearing box 7. The airflow is used to blow the lubricating oil and cleaning agent adhered to the inner wall of the bearing box 7 and the bearing, and then it is discharged by the oil drain valve 13, so that there is no impurity residue inside the cleaned bearing box 7, effectively preventing the newly added lubricating oil from being polluted again.

[0027] The on-line cleaning device for the bearing box of the direct-drive screw pump provided by the present invention is safe, reliable, convenient and fast in the operation process. It can thoroughly remove the deteriorated lubricating oil adhered to the inner wall of the bearing box and the bearing, effectively avoiding the problem of long downtime of the screw pump caused by slow sewage discharge, ensuring the crude oil output, prolonging the service life of the bearing, reducing the failure rate of the bearing box of the screw pump, improving the pumping time rate and increasing the oil output. The specific working process of this on-line cleaning device for the bearing box of the direct-drive screw pump is described in detail below: In this embodiment, a motor 2 is installed at the lower end of the protective cover 1, a bearing box 7 is installed at the lower end of the motor 2, bearings are installed inside the bearing box 7, a Christmas tree 5 is installed at the lower end of the bearing box 7, an oil filling hole and an oil drain hole are provided on the outer wall of the bearing box 7, the lower end of the oil filling hole is the oil drain hole, and an oil level viewing window 6 is provided on one side of the oil filling hole. When not being cleaned usually, an oil filling hole plug 3 is installed on the oil filling hole, and an oil drain hole plug 4 is installed on the oil drain hole. When cleaning, the air pump is connected to the flushing joint 8 or the air supply joint 15 through the air pump outlet joint of the air pump main body. The other side of the flushing joint 8 is successively connected to a flushing valve 9, a short joint tee, and an exhaust valve 10. The other side of the air supply joint 15 is successively connected to a cleaning valve 14, a short joint tee, and an oil drain valve 13. Among them, the short joint tee connected to the flushing valve 9 is usually connected to the oil filling hole of the bearing box 7, and the short joint tee connected to the cleaning valve 14 is usually connected to the oil drain hole of the bearing box 7.

[0028] In practical applications, first, after the direct drive screw pump stops operating, cut off the power supply. First, remove the oil filling hole plug 3, then remove the oil drain hole plug 4, install the scavenging assembly, connect the power cord and the leakage protector at the distribution box, and connect the power cord of the air pump.

[0029] Secondly, start the air pump, connect the air pump outlet joint to the flushing joint 8, open the flushing valve 9 to allow gas to enter the bearing box 7, and quickly discharge the dirty oil. The discharge speed of the dirty oil can be controlled by adjusting the opening degree of the flushing valve 9.

[0030] Thirdly, after the dirty oil is initially drained, install the oil drain assembly, add cleaning agent through the oil filling hole with an oil filling tool, then install the oil filling assembly, connect the air pump outlet joint to the air supply joint 15, first open the exhaust valve 10, then open the cleaning valve 14 to allow gas to enter the bearing box 7, and adjust the cleaning valve 14 to control the intake air flow. The injection of gas causes the cleaning agent in the bearing box 7 to foam fully, and efficiently cleans the deteriorated lubricating oil adhering to the inner wall of the bearing box 7 and the bearing surface.

[0031] Next, after the screw pump runs for about 5 minutes, the angle of the swivel joint 12 can be adjusted to make the air outlet of the nozzle pipe 11 rotate synchronously at multiple angles inside the bearing box 7. At the same time, adjust the depth of the nozzle pipe 11 inserted into the bearing box 7 to achieve a 360° full - range and dead - angle - free cleaning of the deteriorated lubricating oil in the bearing box 7.

[0032] Then, repeat adjusting the angle of the swivel joint 12 every 5 minutes. After several adjustments, stop the screw pump. First, close the cleaning valve 14 and the exhaust valve 10, then connect the air pump outlet joint to the flushing joint 8, open the oil drain valve 13, adjust the flushing valve 9 to control the intake air volume, conduct an air purge on the cleaning agent and the residual deteriorated lubricating oil in the bearing box 7, and discharge them cleanly through the oil drain valve 13.

[0033] Subsequently, new cleaning agent is added back into the bearing housing 7, and the above operations are repeated multiple times while observing the color of the discharged cleaning agent until the color of the cleaning agent is normal. After that, air purging is carried out through an air pump. After draining the fluid in the bearing housing 7 completely, it is ready to be filled with lubricating oil.

[0034] Finally, the scavenging assembly and the oil drain assembly are disassembled, the oil drain hole plug 4 is installed, lubricating oil is added, and finally the oil filling hole plug 3 is installed. The screw pump is started according to the operation requirements.

[0035] The on-line cleaning device for the bearing housing of the direct drive screw pump provided by the present invention has a safe, reliable, convenient and fast operation process. By turning on the air pump during the gravity sewage discharge process to increase the pressure in the bearing housing and accelerate the discharge speed of the deteriorated lubricating oil, it not only avoids the problem of long shutdown time of the screw pump caused by slow sewage discharge, but also effectively avoids the bearing running in the contaminated and deteriorated lubricating oil. Thus, it can thoroughly remove the deteriorated lubricating oil adhering to the inner wall of the bearing housing and the bearing, and prevent the phenomenon that the newly added lubricating oil is mixed with the residual deteriorated lubricating oil and accelerates deterioration. It can not only ensure the crude oil output, but also save the cost of lubricating oil replacement, further reduce the workload of the staff in replacing the lubricating oil, effectively reduce the failure rate of the bearing housing of the screw pump, thereby improving the management level of the direct drive screw pump, prolonging the service life of the bearing, increasing the oil production rate during oil pumping and increasing the oil output, and having good economic and social benefits.

[0036] The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention. The patent protection scope of the present invention shall be defined by the claims.

Claims

1. An on-line cleaning device for the bearing box of a direct-drive screw pump, characterized in that, Including: A protective cover (1) and an air pump. The lower end of the protective cover (1) is equipped with a motor (2). The lower end of the motor (2) is equipped with a bearing box (7). A bearing is installed inside the bearing box (7). The lower end of the bearing box (7) is equipped with a Christmas tree (5). A scavenging assembly, an oil draining assembly, and a nozzle pipe (11) are installed on the bearing box (7). The lower end of the scavenging assembly is the nozzle pipe (11), and the lower end of the nozzle pipe (11) is the oil draining assembly. The air pump is connected to the scavenging assembly or the oil draining assembly, and the nozzle pipe (11) is connected to a rotary joint (12). The bearing box (7) adds a cleaning agent through an oil filling tool. The bearing box (7) controls the speed of dirty oil discharge through the scavenging assembly. The rotary joint (12) adjusts the angle of the nozzle pipe (11) through rotation. The nozzle pipe (11) realizes 360° cleaning by adjusting the depth and angle of insertion into the bearing box (7). Both the oil draining assembly and the scavenging assembly can control the air intake volume of the air pump. The gas input by the air pump cleans the inner wall of the bearing box (7) and the bearing by fusing with the cleaning agent. The bearing box (7) discharges the cleaned dirty oil through the oil draining assembly.

2. The on-line cleaning device for the direct drive screw pump bearing box according to claim 1, characterized in that, The upper end of the bearing box (7) is provided with an oil filling hole, an oil draining hole, and an oil level sight glass (6). The outer wall of the bearing box (7) is provided with an oil filling hole and an oil draining hole. The oil filling hole is connected to a line scavenging assembly, and the oil draining hole is connected to the oil draining assembly. The lower end of the oil filling hole is the oil draining hole, and one side of the oil filling hole is the oil level sight glass (6).

3. The on-line cleaning device for the bearing box of the direct-drive screw pump according to claim 2, characterized in that, The bearing box (7) installs an oil filling hole plug (3) through the oil filling hole and an oil draining hole plug (4) through the oil draining hole.

4. The on-line cleaning device for the direct drive screw pump bearing box according to claim 2, characterized in that, The scavenging assembly includes a short joint tee, a line scavenging joint (8), a line scavenging valve (9), and an exhaust valve (10). The bottom end of the short joint tee is connected to the oil filling hole of the bearing box (7). A line scavenging valve (9) and an exhaust valve (10) are respectively installed on both sides of the short joint tee. The other end of the line scavenging valve (9) is connected to the line scavenging joint (8).

5. The on-line cleaning device for the bearing housing of a direct drive screw pump according to claim 4, characterized in that, The line scavenging joint (8) is connected to the air pump. The line scavenging valve (9) controls the gas of the air pump to enter the bearing box (7), and controls the speed of dirty oil discharge by adjusting the opening degree of the line scavenging valve (9).

6. The on-line cleaning device for the bearing box of the direct drive screw pump according to claim 2, characterized in that, The oil draining assembly includes a short joint tee, an oil draining valve (13), a cleaning valve (14), and a gas supply joint (15). The lower end of the short joint tee is connected to the oil draining hole of the bearing box (7). The two ends of the short joint tee are respectively an oil draining valve (13) and a cleaning valve (14). The other end of the cleaning valve (14) is connected to the gas supply joint (15).

7. The on-line cleaning device for the bearing box of the direct-drive screw pump according to claim 6, characterized in that, The gas supply joint (15) is connected to the air pump. The air intake flow rate of the air pump is controlled by adjusting the cleaning valve (14), and the mixture of the cleaned dirty oil and the cleaning agent is discharged through the oil draining valve (13).

8. The on-line cleaning device for the direct-drive screw pump bearing box according to claim 7, wherein The air pump includes an air pump main body and an air pump power cord. The air pump main body is connected to a distribution box through the air pump power cord, and the distribution box is connected to a leakage protector through a power cord.

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