CN112177551B - Double-seal-structure pipe flushing assembly, pipe flushing device, lubricating system and lubricating process - Google Patents
Double-seal-structure pipe flushing assembly, pipe flushing device, lubricating system and lubricating process Download PDFInfo
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- CN112177551B CN112177551B CN202010901174.0A CN202010901174A CN112177551B CN 112177551 B CN112177551 B CN 112177551B CN 202010901174 A CN202010901174 A CN 202010901174A CN 112177551 B CN112177551 B CN 112177551B
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- 230000001050 lubricating effect Effects 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000008569 process Effects 0.000 title claims abstract description 11
- 238000011010 flushing procedure Methods 0.000 title claims description 44
- 238000007789 sealing Methods 0.000 claims abstract description 172
- 239000003921 oil Substances 0.000 claims abstract description 159
- 239000010687 lubricating oil Substances 0.000 claims abstract description 70
- 239000002002 slurry Substances 0.000 claims abstract description 61
- 238000005406 washing Methods 0.000 claims abstract description 48
- 238000005461 lubrication Methods 0.000 claims abstract description 29
- 239000012080 ambient air Substances 0.000 claims abstract description 3
- 238000002955 isolation Methods 0.000 claims description 51
- 238000003825 pressing Methods 0.000 claims description 27
- 244000261422 Lysimachia clethroides Species 0.000 claims description 17
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 238000005553 drilling Methods 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 4
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims description 2
- 238000004080 punching Methods 0.000 description 13
- 238000012423 maintenance Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 239000003570 air Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000012208 gear oil Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000003746 surface roughness Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009837 dry grinding Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/34—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member
- F16J15/3404—Sealings between relatively-moving surfaces with slip-ring pressed against a more or less radial face on one member and characterised by parts or details relating to lubrication, cooling or venting of the seal
Abstract
The invention relates to a double-seal structure wash pipe assembly, a wash pipe device, a lubricating system and a process thereof. The fixing member is sleeved on the peripheries of the sealing member and the upper punch pipe, the upper end of the fixing member is connected with the upper punch pipe in a sealing mode, and the lower end of the fixing member is connected with the sealing member in a sealing mode, so that a lubricating oil cavity is formed among the upper punch pipe, the sealing member, the lower punch pipe and the fixing member. The sealing member is provided with a first sealing surface and a second sealing surface, the first sealing surface is used for isolating the slurry channel and the lubricating oil cavity, and the second sealing surface is used for isolating the lubricating oil cavity and ambient air. The lubricating oil cavity is used for filling oil. On the one hand, the oil provides lubrication for the rotating parts in the washpipe assembly. On the other hand, the pressure in the lubricating oil cavity is more than or equal to the pressure of the slurry in the slurry channel, so that the outward leakage of the slurry is avoided. The problems that the slurry leakage amount is large, the washing pipe device cannot idle for a long time and is inconvenient to maintain due to a single sealing mode are solved.
Description
Technical Field
The invention relates to the technical field of sealing of a pipe flushing device for petroleum and natural gas drilling, in particular to a double-seal structure pipe flushing assembly, a pipe flushing device, a lubricating system and a lubricating process.
Background
The washpipe device is one of important parts of an oil and gas drilling top drive and is used for connecting a gooseneck and a central pipe rotating relative to the gooseneck and conveying high-pressure slurry output by a drilling pump to a downhole drill bit. Along with the lengthening of the well depth and the horizontal section of the well and the improvement of the requirement of the acceleration and the efficiency improvement of the well drilling, the pumping pressure of the slurry and the rotating speed of the central tube are continuously improved, and the mechanical sealing and pipe flushing device gradually replaces the traditional packing sealing and pipe flushing device at the present stage due to the convenient and fast installation, the small maintenance time, the high working pressure and the long service life.
The existing mechanical sealing washing pipe device adopts a single sealing mode, and is convenient and quick to install, short in maintenance time, high in working pressure and long in service life relative to a packing sealing washing pipe device. However, due to the requirements of lubrication and cooling, the single-seal mechanical seal washpipe device needs to keep a certain slurry leakage amount on a sealing surface, leaked slurry can be accumulated in the top drive bell jar, and personnel are required to clean and maintain in time; in particular, as the physical properties (such as viscosity, density and the like) of the slurry are greatly changed along with different well sections, the leakage rate on the sealing surface of the single-seal mechanical seal washpipe device is also greatly changed; in addition, the single-sealing type mechanical sealing washing pipe device needs to adopt an embedded sealing ring (a silicon carbide or tungsten carbide ring is embedded in a metal ring) because the pressure of slurry is on the inner wall, residual stress exists in the embedded sealing ring, the processing of a sealing surface with high flatness is difficult, and the manufacturing cost is high; in addition, when the slurry pump stops, the sealing surface is required to be prevented from being dry-ground, and the single-sealing type mechanical sealing pipe flushing device does not allow the top drive central pipe to rotate for a long time.
Disclosure of Invention
Technical problem to be solved
The invention relates to a double-seal structure washing pipe assembly, a washing pipe device, a lubricating system and a lubricating process thereof, and solves the problems of large slurry leakage amount and inconvenience in maintenance caused by a single-seal structure of the washing pipe assembly in the prior art.
Disclosure of the invention
Aiming at the defects in the prior art, the invention provides a double-seal structure pipe flushing assembly, a pipe flushing device, a lubricating system and a lubricating process, and the specific technical scheme is as follows:
a double-seal structure washing pipe assembly comprises an upper washing pipe, a lower washing pipe, a sealing component and a fixing component; the upper flushing pipe and the lower flushing pipe are hermetically connected through a sealing component to form a slurry channel inside;
the fixing member is sleeved on the peripheries of the sealing member and the upper punch pipe, the upper end of the fixing member is connected with the upper punch pipe in a sealing mode, and the lower end of the fixing member is connected with the sealing member in a sealing mode, so that a lubricating oil cavity is formed among the upper punch pipe, the sealing member and the fixing member;
the sealing component comprises a double-ring seat, an upper push ring, a lower push ring, a first sealing ring embedded on the upper end surface of the double-ring seat and a second sealing ring embedded on the lower end surface of the double-ring seat;
the upper push ring is sleeved at the lower end of the upper punching pipe, and a third sealing ring is connected between the upper push ring and the upper punching pipe in a sealing manner;
the double-ring seat and the lower push ring are sequentially sleeved on the lower punching pipe from top to bottom, the double-ring seat is hermetically connected with the lower punching pipe, and a fourth sealing ring is arranged between the lower push ring and the lower punching pipe;
the upper push ring is in compression connection with the upper end face of the double-ring seat through a plurality of groups of upper compression devices so as to form a first sealing face on the contact face of the first sealing ring and the third sealing ring, and the first sealing face is used for isolating a slurry channel and a lubricating oil cavity;
two ends of the upper pressing device are respectively fixedly connected with the upper washing pipe and the upper push ring;
the lower push ring is in compression connection with the lower end face of the double-ring seat through a plurality of groups of lower compression devices so as to form a second sealing surface on the contact surface of the second sealing ring and the fourth sealing ring, and the second sealing surface is used for isolating the lubricating oil cavity from ambient air;
two ends of the lower pressing device are respectively fixedly connected with the lower push ring and the lower flange.
Further, the fixed component comprises an upper flange, an outer cylinder and a lower flange which are fixedly connected from top to bottom in sequence; the upper flange is sleeved between the upper punching pipe and the outer cylinder, the inner ring is hermetically connected with the upper punching pipe, and the outer ring is hermetically connected with the outer cylinder; the upper flange is fixedly connected with the upper nut; the lower flange is sleeved on the lower push ring and is connected with the lower push ring in a sealing way; the upper flange is provided with an exhaust hole, and the outer barrel is provided with an oil inlet.
Further, the device also comprises an upper nut and a lower nut; the upper nut is hermetically connected with the upper end of the upper washing pipe through a positioning boss, and the lower nut is hermetically connected with the lower end of the lower washing pipe through a positioning boss;
the upper nut is fixedly connected with the upper flange through a hoop, and the lower nut is fixedly connected with the lower punching pipe through the hoop.
Further, a plurality of groups of upper pressing devices are uniformly arranged on the periphery of the upper washing pipe; the lower pressing devices are uniformly arranged on the periphery of the lower push ring;
the upper pressing device and the lower pressing device have the same structure and comprise a pressure spring and two spring guide pins; two spring guide pins of the upper pressing device are respectively arranged on the upper punching pipe and the upper push ring; two spring guide pins of the lower pressing device are respectively arranged on the lower push ring and the lower flange; the pressure spring is sleeved between the two spring guide pins and is in a compressed state.
Further, the first sealing ring, the second sealing ring, the third sealing ring and the fourth sealing ring are silicon carbide or tungsten carbide sealing rings, and the mirror surfaces face outwards;
the outer peripheries of the upper push ring and the lower push ring are respectively provided with an anti-rotation pin, and the inner peripheries of the upper flange and the lower flange are respectively provided with an anti-rotation groove;
one end of an anti-rotation pin of the push-up ring is sleeved in an anti-rotation groove of the upper flange and used for limiting the rotation of the push-up ring; one end of an anti-rotation pin of the lower push ring is sleeved in an anti-rotation groove of the lower flange and used for limiting the rotation of the lower push ring; the anti-rotation groove is a long hole or a straight groove.
The invention also provides a washing pipe device which comprises a bell jar, a gooseneck and the washing pipe assembly with the double-seal structure;
the flushing pipe assembly with the double-sealing structure is fixed in the bell jar, the lower end of the flushing pipe assembly is connected with the central pipe, and the upper end of the flushing pipe assembly is connected with the gooseneck pipe; the central tube can drive the lower nut, the lower flushing tube and the double ring seat to synchronously rotate;
the upper end of the gooseneck is also connected with a tee union, and the tee union, the gooseneck and the slurry channel are sequentially communicated from top to bottom.
The invention also provides a lubricating system of the pipe flushing device, which comprises an isolation oil cylinder and a throttle valve manifold;
the isolation oil cylinder and the throttle valve are arranged on the washing pipe device;
the isolation piston divides the isolation oil cylinder into an isolation oil cavity and a slurry cavity, and the isolation oil cavity is arranged above the slurry cavity; the oil isolating cavity is respectively communicated with the throttle valve manifold and an oil inlet of the lubricating oil cavity through a hydraulic pipeline so as to ensure that the pressures of the lubricating oil cavity and the oil isolating cavity are equal;
the slurry cavity is communicated with the tee union through a hydraulic pipeline, and the pressure of the slurry cavity is equal to that of the slurry channel;
the throttle valve manifold is communicated with the top drive hydraulic system and/or the gear lubricating system and is used for supplying oil to the isolation oil cavity and the lubricating oil cavity according to set pressure so as to form positive pressure in the lubricating oil cavity.
Further, the throttle valve assembly comprises a valve block, a throttle valve, a pressure reducing valve and a one-way valve; the throttle valve, the pressure reducing valve and the one-way valve are fixed on the valve block in series; the valve block is provided with an oil inlet P, an oil outlet P1 and an oil return port T, the oil inlet P and the oil return port T are communicated with a top drive hydraulic system and/or a lubricating system, and the oil outlet P1 is communicated with an isolation oil cavity; an overflow port of the pressure reducing valve is communicated with the oil return port;
the throttle valve is used for adjusting the oil supply flow, and the pressure reducing valve is used for setting the oil pressure of the isolation oil cavity and the lubricating oil cavity;
when the oil pressure of the slurry cavity is greater than that of the oil isolating cavity, the check valve is used for preventing oil in the oil isolating cavity/the lubricating oil cavity from flowing back, and the oil pressure in the oil isolating cavity/the lubricating oil cavity is increased to be equal to that of the lubricating oil cavity.
Further, a pressure measuring port is further formed in the valve block, a pressure gauge is connected to the pressure measuring port, and the pressure gauge is used for monitoring oil pressure of the isolation oil cavity/the lubricating oil cavity.
The invention also provides a lubricating process of the pipe flushing device and the lubricating system, which comprises the following steps:
s01: starting a top drive hydraulic system and/or a gear lubricating system, setting the pressure of a pressure reducing valve to be minimum, adjusting a throttle valve to be at the maximum opening, injecting oil into a lubricating oil cavity and an isolation oil cavity, blocking an exhaust port after the oil is filled, and adjusting the throttle valve to be at the proper opening;
s02: connecting a pressure gauge to a pressure measuring port, adjusting a pressure reducing valve to a set pressure value, locking an adjusting knob of the pressure reducing valve, and after the set pressure of the system is adjusted, the first sealing surface and the second sealing surface are static seals, and the pressure of a lubricating oil cavity is greater than the pressure of slurry;
s03: when the slurry pump is started, slurry is not conveyed, the top drive hydraulic system and/or the gear lubricating system work, the central pipe rotates, the first sealing surface and the second sealing surface are dynamic seals, and oil in the lubricating oil cavity provides lubrication for the dynamic seals;
s04: the mud pump is started and conveys mud, the top drive hydraulic system and/or the gear lubrication system work, the central pipe rotates, and if the mud pressure is greater than the set pressure of the pressure reducing valve, the lubrication is realized under the action of the isolation piston
The pressure of the lubricating oil cavity is equal to the pressure of the slurry, and the slurry does not leak;
s05: the mud pump is started and continuously conveys mud, the central pipe does not rotate, the mud pressure is equal to the pressure of the lubricating oil cavity, and the mud does not leak;
s06: after drilling of one upright column, the slurry pump stops, the central pipe does not rotate, the top drive hydraulic system and/or the gear lubricating system work, and oil is continuously supplied to the isolation oil cavity until slurry in the slurry cavity is emptied.
(III) advantageous effects
By adopting the double-seal structure pipe flushing assembly, the pipe flushing device, the lubricating system and the process thereof, the defects of the prior art are effectively overcome.
The double-seal structure pipe punching assembly in the invention forms a first seal on the contact surface of the first seal ring and the third seal ring through the compression connection of the upper end surfaces of the push-up ring and the double pipe assembly, and forms a second seal on the contact surface of the second seal ring and the fourth seal ring through the compression connection of the lower end surfaces of the push-down ring and the double pipe assembly. A sealed lubricating oil cavity is formed through the two seals, and oil is filled in the lubricating oil cavity. On the one hand, the lubricating oil cavity provides lubrication for the rotating part, and on the other hand, the pressure in the lubricating oil cavity is ensured to be more than or equal to the pressure of slurry in the slurry channel, so that slurry leakage is avoided.
According to the invention, oil pressure acts on the outer diameter of the sealing ring, the sealing ring does not need to be embedded with a metal ring, the processing difficulty of the sealing ring can be greatly reduced, the surface roughness and the planeness of the sealing surface can be ensured to meet the requirements to the maximum extent, the leakage amount of the mechanical seal is greatly reduced, and the manufacturing cost and the maintenance cost of the flushing pipe assembly are greatly reduced.
The pipe flushing device provided by the invention adopts the pipe flushing assembly, so that the cleanness of a sealed medium is realized, the service life of the sealing ring can be greatly prolonged, the leakage amount of a mechanical sealing surface is reduced, the slurry is prevented from leaking into the bell jar from the pipe flushing device, and the long service life and the maintenance-free property of the pipe flushing device are realized.
In the lubricating system of the pipe flushing device, hydraulic oil or gear oil is introduced into the lubricating oil cavity by utilizing a hydraulic system or a gear lubricating system on the top drive equipment and adopting a throttle valve, a pressure reducing valve, a one-way valve, an isolation oil cylinder and a hydraulic pipeline to form a positive pressure isolation oil cavity.
In the invention, the isolating oil cavity is always filled with oil and kept at positive pressure to continuously supply oil for lubrication of the dynamic seal, and the central pipe can rotate for a long time under the condition that mud is not circulated.
Drawings
FIG. 1: a sectional view of a dual seal configuration washpipe assembly in a particular embodiment;
FIG. 2: the structural schematic diagram of the double-seal structure washing pipe assembly in the specific embodiment;
FIG. 3: the structure schematic diagram of the pipe flushing device and the lubricating system in the specific embodiment;
FIG. 4 is a schematic view of: a hydraulic schematic diagram of a lubrication system of a washpipe apparatus in a particular embodiment;
[ description of reference ]
A. A sealing member; B. a fixing member; C. a pressing device; 1. a gooseneck; 2. a bell jar; 3. a wash pipe assembly; 4. a hydraulic line; 5. a central tube; 6. a hydraulic line; 7. a throttle valve manifold; 8/8', hydraulic lines; 9. isolating the oil cylinder; 10. a hydraulic line; 11. a tee union; 21. screwing a nut; 22/22', a clamp; 23. an exhaust port; 24. an oil inlet; 25. a lower nut; 26. pressing and screwing; 30. washing the pipe upwards; 31 an upper flange; 32. pushing up the ring; 33. a double-ring seat; 34. an outer cylinder; 35. a push ring is pushed down; 36. a lower flange; 37. washing the pipe downwards; 38/38', anti-rotation pins; 39. a seal ring; 40/40', spring guide pins; 41/41', a spring; 42. a fourth seal ring; 43. a first seal ring; 46. a second seal ring; 44. a third seal ring; 101. a second sealing surface; 102. a lubricating oil cavity; 103. a first sealing surface; 104. a slurry channel; 105. isolating an oil cavity; 106. an isolation piston; 107. a slurry chamber; 108. a pressure gauge; 109. a one-way valve; 110. a throttle valve; 111. a pressure reducing valve 111.
Detailed Description
For the purpose of better explaining the present invention and to facilitate understanding, the present invention will be described in detail by way of specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, the present embodiment provides a double seal structure washpipe assembly 3 including an upper washpipe 30, a lower washpipe 37, a sealing member a, and a fixing member B.
Specifically, the upper and lower punches 30 and 37 are sealingly connected by a sealing member a to form a slurry passage 104 therein. The fixing member B is fitted around the outer peripheries of the sealing member a and the upper punch 30, and has an upper end sealingly connected to the upper punch 30 and a lower end sealingly connected to the sealing member a to form an annular lubricating oil chamber 102 between the upper punch 30, the sealing member a and the fixing member B.
Further, the seal member includes a push-up ring 32, a push-down ring 35, a double ring seat 33, a first seal ring 43, and a second seal ring 46. Specifically, the upper push ring 32 is sleeved on the lower end of the upper punch 30, a third sealing ring 44 is arranged between the upper push ring 32 and the upper punch 30, and a sealing ring 45 is arranged on the lower ends of the third sealing ring 44 and the upper punch 30 for sealing.
Specifically, the double ring seat 33 and the lower push ring 35 are sequentially sleeved on the lower wash pipe 37 from top to bottom. Wherein, the double-ring seat 33 is connected with the flushing pipe flange 37 through the back-off thread, and an O-shaped ring is arranged between the double-ring seat and the flushing pipe flange to play a sealing role, so as to ensure that the lower flushing pipe 37 can drive the double-ring seat 33 to rotate synchronously. The upper and lower end of double ring seat 33 has processed the sealing ring mounting groove respectively, and first sealing ring 43 and second sealing ring 46 are installed respectively in double ring seat 33's mounting groove, set up clearance fit between first sealing ring 43, second sealing ring 46 and the mounting groove, still dispose O type circle between first sealing ring 43, second sealing ring 46 and the mounting groove simultaneously and play sealed effect, and first sealing ring 43 and second sealing ring 46 mirror surface are outwards. The fourth sealing ring 42 is sleeved on the upper end of the lower push ring 35 in a clearance fit mode, an O-shaped ring is arranged between the fourth sealing ring 42 and the lower push ring 35 for sealing, the mirror surface of the fourth sealing ring 42 faces outwards, and a sealing ring 39 is arranged between the lower push ring 35 and the fixing component B for sealing.
In this embodiment, the upper pressing device C pushes the push-up ring 32 to press against the upper end surface of the double ring seat 33, so that the third sealing ring 44 and the first sealing ring 43 are closely attached to each other in a mirror surface manner, and a first sealing surface 103 is formed at a contact surface, where the first sealing surface 103 is used to isolate the slurry channel 104 from the lubricating oil cavity 102. The lower pressing device C' pushes the lower push ring 35 to press against the lower end surface of the double ring seat 33, so that the second seal ring 46 and the fourth seal ring 42 are closely attached to each other in a mirror surface manner, a second seal surface 101 is formed at the contact surface, and the second seal surface 101 is used for sealing the lubricating oil cavity 102 to prevent oil leakage. The lubricating oil cavity 102 is filled with oil, when the lower flushing pipe 37 and the double-ring seat 33 rotate, the first sealing surface 103 and the second sealing surface 101 become dynamic seals, and the oil provides lubrication for the dynamic seals, so that dry grinding is prevented, and the service life of the sealing rings is prolonged. The pressure in the lubricating oil cavity is greater than or equal to the pressure of slurry in the slurry channel, so that slurry leakage can be effectively avoided, and the maintenance is facilitated.
Further, the fixing member B in the present embodiment includes an upper flange 31, an outer cylinder 34, and a lower flange 36. The upper flange 31 is sleeved on the upper punching pipe 30, and an axial positioning step and an O-shaped ring are arranged at the joint of the upper flange 31 and the upper punching pipe 30 so as to ensure the coaxiality and static sealing when the upper flange 31 and the upper punching pipe 30 are assembled. The lower flange 36 is sleeved on the lower push ring 35, and a sealing ring is arranged between the lower flange and the lower push ring for sealing. The lower end of the upper flange 31 is sleeved in the upper end of the outer cylinder 34 and is tightly connected together through bolts, and an O-shaped ring is arranged between the upper flange 31 and the outer cylinder 34 for sealing. The upper end of the lower flange 36 is sleeved in the lower end of the outer cylinder 34 and is fastened and connected through bolts, and an O-shaped ring is arranged between the lower flange 36 and the outer cylinder 34 for sealing. Specifically, the upper flange 31 is further provided with an exhaust port 23, and the outer cylinder 34 is provided with an oil inlet 24. Oil is injected into the lubricating oil cavity 102 through the oil inlet 24, gas in the lubricating oil cavity 102 is discharged from the exhaust port 23, and the exhaust port 23 is blocked after the oil is filled.
Further, in the present embodiment, a plurality of sets of upper pressing devices C are uniformly arranged on the outer periphery of the upper punch 30, and both ends of the upper pressing devices C are respectively connected to the upper punch 30 and the push-up ring 32. The multiple groups of lower pressing devices C 'are uniformly arranged on the periphery of the lower push ring 35, and two ends of the lower pressing devices C' are respectively connected with the lower flange 36 and the lower push ring 35. Specifically, the upper and lower compression devices C and C' are identical in structure and each include two spring guide pins and a spring. Two spring guide pins 40 of the upper pressing device C are respectively fixed on the upper punch 30 and the lower push ring 32, and both ends of a spring 41 are respectively sleeved on the two spring guide pins 40 and abut against the upper punch 30 and the lower push ring 32. Further, the spring 41 is a compression spring, and is in a compressed state during normal use to press and connect the push-down ring 32 and the double ring seat 33. Two spring guide pins 40 ' of the lower pressing device C ' are respectively fixed on the lower flange 36 and the lower push ring 35, two ends of a spring 41 ' are respectively sleeved on the two spring guide pins 40 ' and are abutted against the lower flange 36 and the lower push ring 35, and the spring 41 ' is in a compressed state so as to tightly press and connect the lower push ring 35 and the double ring seat 33.
Further, the washpipe assembly in this embodiment further includes an upper nut 21 and a lower nut 25. Wherein, the upper nut 21 is arranged on the upper washing pipe 30 through an axial positioning step, and an oil O-shaped ring is also arranged between the upper nut and the upper washing pipe. The upper nut 21 is fixedly connected with the upper flange 31 through a clamp 22. The lower nut 25 is fixedly connected to the lower wash pipe 37 by a clamp 22', and a seal ring is disposed therebetween. Wherein, dispose a plurality of circular blind holes on the external diameter of upper nut 21 and lower nut 25, be the frock hole for install the torsion bar.
Further, in this embodiment, an anti-rotation pin 38 is further disposed on an outer periphery of the push-up ring 32, correspondingly, an anti-rotation slot is disposed on an inner periphery of a lower end of the upper flange 31, and one end of the anti-rotation pin 38 is sleeved in the anti-rotation slot, so that the push-up ring 32 can move relatively to the upper flange 31 in the axial direction but cannot rotate radially. Similarly, an anti-rotation pin 38 'is disposed on the outer periphery of the lower end of the lower push ring 35, an anti-rotation slot is disposed on the lower inner periphery of the lower flange 36, and one end of the anti-rotation pin 38' is fitted into the anti-rotation slot, so that the lower push ring 35 can move relatively to the lower flange 36 in the axial direction but cannot rotate radially.
Further, in the present embodiment, the first seal ring 43, the second seal ring 46, the third seal ring 44, and the fourth seal ring 42 are silicon carbide or tungsten carbide seal rings. Since the oil pressure in the oil chamber 102 acts on the outer diameter of the seal ring, the seal ring does not need to be lined with a metal ring. Therefore, the processing difficulty of the sealing ring is greatly reduced, the surface roughness and the planeness of the sealing surface can be guaranteed to meet the requirements to the maximum extent, the leakage rate of the mechanical seal is greatly reduced, and the manufacturing cost and the maintenance cost of the washing pipe assembly are greatly reduced.
Referring to fig. 2, the embodiment further provides a washpipe device, which includes a bell jar 2, a gooseneck 1 and the washpipe assembly 3 with the double-sealing structure. The washing tube assembly 3 is fixed in the bell jar 2, the lower end of the washing tube assembly is hermetically connected with the central tube 5, the upper end of the washing tube assembly is hermetically connected with the gooseneck tube 1, and the washing tube assembly is screwed tightly by a torsion bar. The central tube 5 can drive the lower nut 25, the lower punch tube 37 and the double ring seat 33 in the punch tube assembly 3 to synchronously rotate. The upper end of the gooseneck 1 is also connected with a tee union 11. Wherein, the tee joint union 11, the gooseneck 1 and the slurry channel 104 are communicated in sequence from top to bottom.
The mounting and dismounting process of the pipe washing device comprises the following steps: 1) screwing the lower nut 25 into the upper end of the central tube 5, and screwing the lower nut through the torsion bar; 2) screwing the upper nut 21 into the lower end of the gooseneck 1 and screwing the gooseneck with a torsion bar; 3) after the two pressing bolts 26 are synchronously screwed to press and fix the double-seal structure flushing pipe assembly 27, the flushing pipe assembly 27 is arranged between the lower end surface of the upper nut 21 and the upper end surface of the lower nut 25, so that the positioning step at the lower end of the lower flushing pipe 37 is inserted into the step hole at the upper end of the lower nut 25, and the O-shaped ring is confirmed to be installed in place; 4) gradually loosening the two pressing bolts 26 to enable the positioning step of the upper flange 30 to be inserted into the step hole at the lower end of the upper nut 21 and confirm that the O-shaped ring is installed in place; 5) the upper flange 31 and upper nut 21 of the washpipe assembly 27, and the lower wash pipe 37 and lower nut 25 are secured together by clamps 22, respectively. After the installation step is completed, the tubing pressure is removed and the bolts 26 are properly secured.
Referring to fig. 2 and 3, the embodiment further provides a lubricating system of the pipe flushing device, which includes the isolation oil cylinder 9, the throttle valve assembly 7 and the pipe flushing device.
Specifically, the isolation oil cylinder 9 and the throttle valve 7 are fixed on the washpipe device, the isolation oil cylinder 9 is divided into an isolation oil cavity 105 and a slurry cavity 107 by an isolation piston 106, the isolation oil cavity 105 is arranged above the slurry cavity 107, and the upper end of the isolation oil cavity 105 is further provided with an exhaust hole 112 for exhausting gas in the isolation oil cavity 105. The oil isolating chamber 105 is communicated with the throttle valve manifold 7 through a hydraulic pipeline 6 and is communicated with the oil inlet 24 of the lubricating oil chamber 102 through a hydraulic pipeline 4, so that the oil pressure in the lubricating oil chamber 102 is equal to that in the oil isolating chamber 105. The mud chamber 107 communicates with the three-way union 11 via hydraulic line 10 to ensure that the mud chamber 107 and mud channel 104 are at equal pressure. The throttle manifold is communicated with a top drive hydraulic system and/or a gear lubricating system through a hydraulic pipeline, and the top drive hydraulic system and/or the gear lubricating system are used for supplying oil to the oil isolating cavity 105 and the oil lubricating cavity 102 according to set pressure. Wherein, the top drive hydraulic system and the gear lubrication system are the existing ones and are used for providing power and lubrication for other mechanisms of the petroleum drilling top drive device.
Specifically, the throttle valve manifold 7 includes a valve block and a throttle valve 110, a pressure reducing valve 111, and a check valve 109 fixed to the valve block and connected in series in this order. The valve block is provided with an oil inlet P, an oil outlet P1 and an oil return port T. An overflow port of the pressure reducing valve 111 is communicated with the oil return port T, and is used for returning redundant oil to an oil tank of the top drive hydraulic system and/or the lubricating system. The oil inlet P is communicated with a top drive hydraulic system and/or a lubricating system through a hydraulic pipeline 8, and the oil outlet P1 is communicated with the isolation oil cavity 105. Further, a pressure measuring port is further formed in the valve block, and a pressure gauge 108 is connected to the pressure measuring port and used for monitoring oil pressure in the isolation oil cavity 105/the lubricating oil cavity 102, so that equipment maintenance is facilitated. The throttle valve 110 is used to adjust the flow rate of the oil supply and to cut off the oil supply when the flushing device and the lubrication sealing system are maintained. The pressure reducing valve 111 is used to set the oil pressures in the oil-separating chamber 105 and the oil-lubricating chamber 102, and the check valve 109 is used to prevent the oil in the oil-lubricating chamber 102 and the oil-separating chamber 107 from flowing back to the pressure reducing valve 111.
In this embodiment, the specific lubrication process of the pipe flushing device and the lubrication system includes the following steps:
1) and stopping the pump of the slurry pump, starting a top drive hydraulic system or a gear lubrication system, setting the pressure of a pressure reducing valve 111 to be minimum, and adjusting a throttle valve 110 to be maximum opening. Oil is injected into the lubricating oil chamber 102 and the oil isolating chamber 105 until the oil is discharged from the air outlet 23 provided above the lubricating oil chamber 102 and the air outlet 112 provided in the oil isolating chamber 105, respectively, and the air outlets are blocked by respective plugs.
2) And adjusting the throttle valve 110 to a proper opening degree, locking an adjusting knob of the throttle valve 110, connecting the pressure gauge to the pressure measuring port 108, and adjusting the pressure reducing valve 111 until the pressure gauge reads to a set value. At this time, the isolating piston 106 moves to the lowest position, the volume of the isolating oil cavity 105 is the largest, positive pressure is formed in the lubricating oil cavity 102 and the isolating oil cavity 105 and is filled with hydraulic oil or gear oil, the adjusting knob of the pressure reducing valve 111 is locked, and the pressure setting of the system is completed.
3) The mud pump stops pumping, the top drive hydraulic system and the gear lubricating system work, the central pipe 5 rotates, the volume of the isolated oil cavity 105 is maximum, and the lubricating oil cavity 102 and the isolated oil cavity 105 are filled with oil. The outer sides of the second sealing surface 101 and the first sealing surface 103 are subjected to the liquid pressure of a lubricating oil cavity 102, the inner diameter of the second sealing surface 103 is subjected to the atmospheric pressure, the first sealing surface 103 and the second sealing surface 101 are in a dynamic sealing state, oil in the lubricating oil cavity 102 provides lubrication for the dynamic sealing, and dry grinding cannot occur. Because the positive pressure in the lubricating oil cavity 102 is set reasonably, the sealed medium is oil, and the oil leaks from the outer diameter of the first sealing surface 103 and the second sealing surface 101 to the inner diameter direction during operation, but the leakage amount is very small and is ignored.
3) The mud pump is started and delivers mud, the central pipe 5 rotates, the top drive hydraulic system or the gear oil forced lubrication system works, the mud enters the mud cavity 107 from the mud channel 104 through the hydraulic pipeline 10, and the first sealing surface 103 and the second sealing surface 101 are in a dynamic sealing state. When the liquid pressure of the slurry cavity 107 is smaller than the liquid pressure of the isolation oil cavity 105, the isolation oil cavity 105 is in a maximum volume state, the outer sides of the first sealing surface 103 and the second sealing surface 101 are subjected to the liquid pressure of the lubricating oil cavity 102, the inner diameter of the first sealing surface 103 is subjected to atmospheric pressure, the inner diameter of the second sealing surface 101 is subjected to slurry pressure, and the first sealing surface 103 and the second sealing surface 101 cannot be dry-ground. Because the positive pressure in the lubricating oil cavity 102 is set reasonably, the sealed medium is oil, the oil leaks from the outer diameter of the sealing surface to the inner diameter direction during working, and the leakage amount is very small and is ignored. When the mud pressure is greater than the pressure set by the pressure reducing valve 111, the liquid pressure in the lubricating oil chamber 102 is equal to the mud pressure by the action of the isolating piston 106, at this time, the pressures inside and outside the first sealing surface 103 are equal, the pressure difference is zero, no leakage exists, the oil in the lubricating oil chamber 102 does not enter the mud passage 104, and the mud in the mud passage 104 does not enter the lubricating oil chamber 102. The inside of the second seal surface 101 is at atmospheric pressure, and the outside receives oil pressure, so that oil in the oil lubrication chamber 102 leaks to the atmosphere inside the second seal surface 101 during operation. As the oil in the oil chamber 102 leaks to the atmosphere, the oil in the oil isolating chamber 105 is replenished to the oil chamber 102 through the hydraulic line 4, and the slurry in the slurry passage 104 enters the slurry chamber 107. When the surface roughness and the planeness of the sealing surface meet the requirements and the material has good wear resistance, the sealing medium is oil, and the movable ring has good following performance to the stationary ring, the mechanical seal can keep a small leakage amount and even can not be observed by naked eyes.
4) And the mud pump continuously conveys mud, the central pipe 5 does not rotate, the second sealing surface 101 and the first sealing surface 103 are in a static sealing state at the moment, the pressure of the lubricating oil cavity 102 is equal to that of the mud channel 104, and the leakage amount is extremely low.
5) And after a stand is drilled, stopping the mud pump, enabling the top drive hydraulic system or the gear lubrication system to work, enabling the central pipe not to rotate, continuously pumping oil into the isolation oil cavity 105 until mud in the mud cavity 106 is emptied, and closing the top drive hydraulic system or the gear lubrication system.
When the amount of leakage of oil from the lubricating oil chamber 102 through the second sealing surface 101 continues to increase, the washpipe assembly 27 needs to be replaced.
In this embodiment, the oil is introduced into the lubricating oil chamber 102 and the isolation oil chamber 106 by using a top drive hydraulic system or a gear lubrication system, using a throttle valve 110, a pressure reducing valve 111, a check valve 109, the isolation cylinder 9, and a hydraulic line, to form a positive pressure isolation oil chamber 106. When the mud pump is stopped, the top drive hydraulic system or the gear lubrication system provides a suitable hydraulic pressure to the inside of the isolated oil chamber 105 and fills the isolated oil chamber 105 with oil. When the mud pump is started, the liquid pressure of the lubricating oil cavity 102 in the washing pipe device is smaller than or equal to the mud pressure in the mud channel 104 through the isolation oil cylinder 9, and therefore it is ensured that mud cannot enter the lubricating oil cavity 102 through the first sealing surface 103. Therefore, the cleanness of the sealed medium of the main seal of the mechanical sealing device is realized, the service life of the sealing ring can be greatly prolonged, the leakage amount of the mechanical sealing surface is greatly reduced, the slurry is prevented from leaking into the bell jar from the pipe washing device, and the long service life and the maintenance-free performance of the pipe washing device are realized.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution of the present invention and the inventive concept within the technical scope of the present invention.
Claims (10)
1. A double-seal structure washing pipe assembly is characterized by comprising an upper washing pipe (30), a lower washing pipe (37), a sealing component (A) and a fixing component (B);
the upper washing pipe (30) and the lower washing pipe (37) are hermetically connected through the sealing member (A) to form a slurry channel (104) inside;
the fixed member (B) is sleeved on the peripheries of the sealing member (A) and the upper washing pipe (30), the upper end of the fixed member (B) is connected with the upper washing pipe (30) in a sealing mode, and the lower end of the fixed member (B) is connected with the sealing member (A) in a sealing mode, so that a lubricating oil cavity (102) is formed among the upper washing pipe (30), the lower washing pipe (37), the sealing member (A) and the fixed member (B);
the sealing component (A) comprises a double-ring seat (33), an upper push ring (32), a lower push ring (35), a first sealing ring (43) embedded on the upper end face of the double-ring seat (33) and a second sealing ring (46) embedded on the lower end face of the double-ring seat (33);
the upper push ring (32) is sleeved at the lower end of the upper washing pipe (30), and a third sealing ring (44) is connected between the upper push ring (32) and the upper washing pipe (30) in a sealing manner;
the double-ring seat (33) and the lower push ring (35) are sequentially sleeved on the lower washing pipe (37) from top to bottom, the double-ring seat (33) is hermetically connected with the lower washing pipe (37), and a fourth sealing ring (42) is arranged between the lower push ring (35) and the lower washing pipe (37);
the push-up ring (32) is in compression connection with the upper end face of the double-ring seat (33) through a plurality of groups of upper compression devices (C) so as to form a first sealing face (103) on the contact face of the first sealing ring (43) and the third sealing ring (44), and the first sealing face (103) is used for isolating the slurry channel (104) and the lubricating oil cavity (102);
two ends of the upper pressing device (C) are respectively fixedly connected with the upper washing pipe (30) and the upper push ring (32);
the lower push ring (35) is in compression connection with the lower end face of the double-ring seat (33) through a plurality of groups of lower compression devices (C') so as to form a second sealing surface (101) on the contact surface of the second sealing ring (46) and the fourth sealing ring (42), and the second sealing surface (101) is used for isolating a lubricating oil cavity (102) from ambient air;
the fixing component (B) comprises an upper flange (31), an outer cylinder (34) and a lower flange (36) which are fixedly connected from top to bottom in sequence;
and two ends of the lower pressing device (C') are respectively fixedly connected with the lower push ring (35) and the lower flange (36).
2. The dual seal configuration washpipe assembly as claimed in claim 1, further comprising an upper nut (21) and a lower nut (25); the upper flange (31) is sleeved between the upper flushing pipe (30) and the outer cylinder (34), the inner ring is in sealing connection with the upper flushing pipe (30), and the outer ring is in sealing connection with the outer cylinder (34);
the upper flange (31) is fixedly connected with the upper nut (21);
the lower flange (36) is sleeved on the lower push ring (35) and is connected with the lower push ring (35) in a sealing manner;
the upper flange (31) is provided with an exhaust hole, and the outer cylinder (34) is provided with an oil inlet (24).
3. The double-seal structure wash pipe assembly as claimed in claim 2, characterized in that the upper nut (21) is connected to the upper end of the upper wash pipe (30) in a sealing manner through a positioning boss, and the lower nut (25) is connected to the lower end of the lower wash pipe (37) in a sealing manner through a positioning boss;
the upper nut (21) is fixedly connected with the upper flange (31) through a hoop (22), and the lower nut (25) is fixedly connected with the lower flushing pipe (37) through a hoop (22').
4. The double seal structure wash pipe assembly according to claim 1 or 2, wherein a plurality of sets of the upper pressing means (C) are uniformly arranged on the outer periphery of the upper wash pipe (30);
a plurality of groups of lower pressing devices (C') are uniformly arranged on the periphery of the lower push ring (35);
the upper pressing device (C) and the lower pressing device (C') are identical in structure and comprise a pressure spring and two spring guide pins;
the two spring guide pins of the upper pressing device (C) are respectively arranged on the upper flushing pipe (30) and the upper pushing ring (32);
the two spring guide pins of the lower hold-down device (C') are arranged on the lower push ring (35) and the lower flange (36), respectively;
the compression spring is sleeved between the two spring guide pins and is in a compressed state.
5. The double seal structure washpipe assembly as in claim 1, wherein the first seal ring (43), the second seal ring (46), the third seal ring (44), and the fourth seal ring (42) are silicon carbide or tungsten carbide seal rings, mirror-facing outward;
the outer peripheries of the upper push ring (32) and the lower push ring (35) are respectively provided with an anti-rotation pin, and the inner peripheries of the upper flange (31) and the lower flange (36) are respectively provided with an anti-rotation groove;
one end of the anti-rotation pin (38) of the push-up ring (32) is sleeved in the anti-rotation groove of the upper flange (31) and used for limiting the rotation of the push-up ring (32);
one end of the anti-rotation pin (38') of the lower push ring (35) is sleeved in the anti-rotation groove of the lower flange (36) and used for limiting the rotation of the lower push ring (35);
the anti-rotation groove is a long hole or a straight groove.
6. A washpipe device, comprising a bell jar (2), a gooseneck (1) and a washpipe assembly (3) of double seal structure according to any one of claims 2 to 3;
the double-seal structure washpipe assembly (3) is fixed in the bell jar (2), the lower end of the double-seal structure washpipe assembly is connected with the central pipe (5), and the upper end of the double-seal structure washpipe assembly is connected with the gooseneck pipe (1);
the central pipe (5) can drive a lower nut (25), the lower washing pipe (37) and the double-ring seat (33) to synchronously rotate;
the upper end of gooseneck (1) still is connected with tee bend union (11), tee bend union (11) gooseneck (1) with mud passageway (104) from top to bottom communicate in proper order.
7. The lubrication system of a washpipe apparatus as claimed in claim 6, comprising an isolation cylinder (9) and a choke manifold (7);
the isolation oil cylinder (9) and the throttle valve manifold (7) are fixed on the washing pipe device;
an isolation piston (106) divides the isolation oil cylinder (9) into an isolation oil cavity (105) and a slurry cavity (107), wherein the isolation oil cavity (105) is arranged above the slurry cavity (107);
the oil isolation chamber (105) is respectively communicated with the throttle valve manifold (7) and an oil inlet (24) of the lubricating oil chamber (102) through hydraulic pipelines so as to ensure that the pressures of the lubricating oil chamber (102) and the oil isolation chamber (105) are equal;
the mud cavity (107) is communicated with the three-way union (11) through a hydraulic pipeline, and the mud cavity (107) and the mud channel (104) are equal in pressure;
the throttle valve manifold (7) is communicated with a top drive hydraulic system and/or a gear lubricating system and is used for supplying oil to the isolation oil cavity (105) and the lubricating oil cavity (102) according to set pressure so as to form positive pressure in the lubricating oil cavity (102).
8. The lubrication system of a washpipe device according to claim 7, characterized in that the throttle manifold (7) comprises a valve block, a throttle valve (110), a pressure reducing valve (111) and a check valve (109);
the throttle valve (110), the pressure reducing valve (111) and the one-way valve (109) are fixed on the valve block in series;
an oil inlet P, an oil outlet P1 and an oil return port T are formed in the valve block, the oil inlet P and the oil return port T are communicated with the top drive hydraulic system and/or the lubricating system, and the oil outlet P1 is communicated with the isolation oil cavity (105);
an overflow port of the pressure reducing valve (111) is communicated with the oil return port T;
the throttle valve (110) is used for adjusting oil supply flow, and the reducing valve (111) is used for setting oil pressure of the isolation oil cavity (105) and the lubricating oil cavity (102);
when the oil pressure of the slurry cavity (107) is larger than that of the isolation oil cavity (105), the one-way valve is used for preventing oil in the isolation oil cavity (105)/the lubricating oil cavity (102) from flowing back, and the oil pressure in the isolation oil cavity (105)/the lubricating oil cavity (102) is increased to be equal to that of the slurry cavity (107).
9. The lubrication system of a washpipe apparatus as claimed in claim 8, wherein the valve block is further provided with a pressure tap (108), the pressure tap (108) being adapted to be connected to a pressure gauge for monitoring the oil pressure in the isolation oil chamber (105)/the lubrication oil chamber (102).
10. The lubrication system lubrication process of claim 7, comprising the steps of:
s01: starting a top drive hydraulic system and/or a gear lubricating system, not starting a slurry pump, setting the pressure of a reducing valve (111) to be minimum, adjusting a throttle valve (110) to be at the maximum opening degree, filling oil into a lubricating oil cavity (102) and an isolation oil cavity (105), blocking an exhaust port (23) after filling, and adjusting the throttle valve (110) to be at the proper opening degree;
s02: connecting a pressure gauge to a pressure measuring port (108), adjusting a pressure reducing valve (111) to a set pressure value, locking an adjusting knob of the pressure reducing valve (111), finishing adjustment of the set pressure of the system, enabling a first sealing surface (103) and a second sealing surface (101) to be static seals, and forming positive pressure inside a lubricating oil cavity (102);
s03: the mud pump is not started, the top drive hydraulic system and/or the gear lubricating system work, the central pipe (5) rotates, the first sealing surface (103) and the second sealing surface (101) are in dynamic sealing, and oil in the lubricating oil cavity (102) provides lubrication for the dynamic sealing;
s04: the mud pump is started and conveys mud, a top drive hydraulic system and/or a gear lubricating system work, the central pipe (5) rotates, if the mud pressure is greater than the set pressure of the pressure reducing valve (111), the pressure of the lubricating oil cavity (102) is equal to the mud pressure under the action of the isolation piston (106), and the mud does not leak;
s05: the mud pump is started and continuously conveys mud, the central pipe (5) does not rotate, the mud pressure is equal to the pressure of the lubricating oil cavity (102), and the mud does not leak;
s06: after drilling of one upright column, the slurry pump stops, the central pipe (5) does not rotate, the top drive hydraulic system and/or the gear lubricating system work, and oil is continuously supplied to the oil isolation cavity (105) until slurry in the slurry cavity (107) is emptied.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901174.0A CN112177551B (en) | 2020-08-31 | 2020-08-31 | Double-seal-structure pipe flushing assembly, pipe flushing device, lubricating system and lubricating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010901174.0A CN112177551B (en) | 2020-08-31 | 2020-08-31 | Double-seal-structure pipe flushing assembly, pipe flushing device, lubricating system and lubricating process |
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| Publication Number | Publication Date |
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| CN112177551A CN112177551A (en) | 2021-01-05 |
| CN112177551B true CN112177551B (en) | 2022-06-14 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6969071B2 (en) * | 2002-08-13 | 2005-11-29 | Perkinelmer, Inc. | Face seal assembly |
| US7487848B2 (en) * | 2006-04-28 | 2009-02-10 | Varco I/P, Inc. | Multi-seal for top drive shaft |
| CN102297264B (en) * | 2011-08-08 | 2014-04-09 | 艾迪机器(杭州)有限公司 | Container-type mechanical shaft seal piece and double-end surface shaft seal piece comprising same |
| CN202228416U (en) * | 2011-09-07 | 2012-05-23 | 武汉船用机械有限责任公司 | Pump shaft sealing device for cargo oil pump |
| CN202501010U (en) * | 2012-03-15 | 2012-10-24 | 成都一通密封有限公司 | Ultrahigh pressure drilling mechanical seal |
| CN206234157U (en) * | 2016-11-22 | 2017-06-09 | 南京林业大学 | Double End packaging type pumps Hydrodynamic pressure type mechanical seal certainly |
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Address after: Room 328, Haishunde building, A1 Donghuan North Road, Daxing Economic and Technological Development Zone, Beijing 100176 Patentee after: Beijing Jiejie West Technology Co.,Ltd. Address before: Room 328, Haishunde building, A1 Donghuan North Road, Daxing Economic and Technological Development Zone, Beijing 100176 Patentee before: Beijing Jiejiexi Petroleum Equipment Co.,Ltd. |
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