CN108489839B - Packing wearing state monitoring device - Google Patents
Packing wearing state monitoring device Download PDFInfo
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- CN108489839B CN108489839B CN201810526093.XA CN201810526093A CN108489839B CN 108489839 B CN108489839 B CN 108489839B CN 201810526093 A CN201810526093 A CN 201810526093A CN 108489839 B CN108489839 B CN 108489839B
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- 238000012856 packing Methods 0.000 title claims abstract description 163
- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 230000007246 mechanism Effects 0.000 claims abstract description 41
- 229920001971 elastomer Polymers 0.000 claims abstract description 39
- 238000003825 pressing Methods 0.000 claims description 23
- 230000008054 signal transmission Effects 0.000 claims description 14
- 238000006073 displacement reaction Methods 0.000 claims description 12
- 239000012530 fluid Substances 0.000 claims description 12
- 238000012545 processing Methods 0.000 claims description 9
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 210000004907 gland Anatomy 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000605 extraction Methods 0.000 abstract description 4
- 239000003208 petroleum Substances 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 description 27
- 230000009471 action Effects 0.000 description 10
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 206010019233 Headaches Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 231100000869 headache Toxicity 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013643 reference control Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/56—Investigating resistance to wear or abrasion
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
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- Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
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- Engineering & Computer Science (AREA)
- Immunology (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Biochemistry (AREA)
- Pathology (AREA)
- Analytical Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
Abstract
The invention belongs to the technical field of tools on petroleum exploitation wells, and particularly relates to a packing wear state monitoring device which comprises a filling bin (1), a metering mechanism (4) and a pressure matching cylinder (5); the packing bin (1) comprises a shell (104), a shield (106), a rubber cylinder (105) and a packing (2); the rubber cylinder (105) and the packing (2) are respectively arranged in the shell (104); the cursor (3) is positioned on the central axis of the shell (104); the packing (2) and the rubber cylinder (105) are sequentially sleeved with the cursor (3); the end part of the shield (106) is fixedly connected with the end part of the rubber cylinder (105); the inner wall of the shell (104) and the outer wall of the rubber cylinder (105) form a pressure cavity E. The invention can prolong the service life of the packing, provide the on-site information and the remote information of the working abrasion state of the packing, control the underground burst pressure rise in real time, lighten the working intensity of oil extraction workers and reduce the production risk.
Description
Technical Field
The invention belongs to the technical field of tools on petroleum exploitation wells, and particularly relates to a packing wear state monitoring device.
Background
The oil extraction pumping unit is distributed and dispersed, the area is wide, the polished rod sealing state of each well has no accurate dynamic data, the oil extraction workers need to constantly run the well to observe and master the polished rod sealing condition, the sealing quality is basically judged by observing and controlling the sealing leakage state on site, after the polished rod packing box is maintained for one time, the next time is not controlled, the polished rod sealing state can only be monitored by increasing the inspection frequency, and the workload and the working strength are large.
In order to prevent running, blowing and blowout, fastening or replacing a polish rod sealing packing becomes an important work, meanwhile, the underground exploitation process is more and more complex, the stratum pressure change is unusual, the polish rod packing box used at present cannot increase the sealing force along with sudden pressure rise in a well, the phenomenon that the polish rod packing box is inspected in the daytime is frequently generated, the running, blowing and blowout occur at night, the environment pollution causes production accidents, and great mind and management pressure are also formed for oil workers.
In the oil extraction process, the polish rod can shake, twist and deviate from the horsehead position of the pump, so that the packing is severe in service condition, the packing cannot adapt to the dynamic state of the polish rod when being sealed, the service life of the packing is shortened, and the packing is replaced frequently.
At present, the existing polish rod sealer, the packing work relies on the axial compression force that the pressure cap on the packing box promotes and produces, radial expansion and hugs the polish rod and produces sealing force under the axial compression force, when the polish rod moves down, the packing overlaps with friction force of the polish rod and packing axial compression force, packing lower part pressure is increased, packing lower part and friction force of the polish rod are also increased, packing sealing state is tight and loose at this moment, similarly, when the polish rod moves up, packing box packing can produce and tight and loose state, the repetitive cycle, fluid in the well will spill over from the polish rod, the traditional packing box compresses the sealing mode of packing, make the control of fastening packing force, become the scene workman operation and compare the headache, the packing compression force is too big, packing friction force of both ends is big about the packing box, thereby lead to the polish rod lubrication bad, packing wearing seriously, the service life is shortened, also harm the polish rod, simultaneously friction resistance is too big, increase the motor power, cause the waste; too small packing tightening force can cause packing leakage, and pollute the wellhead and the atmosphere; the packing is replaced on site according to the sealing condition, the packing is required to be replaced when the packing is fastened with the maximum fastening force and still leaks, and the packing is convenient to replace by experience, but the packing is low in utilization efficiency and short in service life, the labor intensity of workers is improved, and the production cost is increased.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the packing wear state monitoring device which can prolong the service life of packing, provide on-site information and remote information of packing work wear state, control the underground burst pressure rise in real time, lighten the working strength of oil production workers and reduce the production risk.
In order to solve the technical problems, the invention is realized as follows:
The packing wear state monitoring device comprises a filling bin, a metering mechanism and a pressure matching cylinder; the bottom of the packing bin is fixedly connected with the wellhead component; the packing bin comprises a shell, a shield, a rubber cylinder and packing; the rubber cylinder and the packing are respectively arranged in the shell; the cursor is positioned on the center axis of the shell; the packing and the rubber cylinder are sequentially sleeved with the cursor; the end part of the shield is fixedly connected with the end part of the rubber cylinder; the inner wall of the shell and the outer wall of the rubber cylinder form a pressure cavity E; an oil injection valve is fixedly arranged on the shell; the oil injection valve is communicated with the pressure cavity E;
The metering mechanism comprises a cylinder body, a piston and a piston rod; the piston divides the cylinder body into a metering cavity C and a metering cavity D; the metering cavity D is communicated with the pressure cavity E; a spring is arranged above the piston rod in the metering cavity C; a piston rod displacement measuring mechanism is arranged on the piston rod and the cylinder body;
The pressure matching cylinder comprises a shell and a piston group; the piston group divides the shell into a matching cylinder B cavity and a matching cylinder A cavity; the cavity of the matching cylinder B is communicated with the metering cavity C; the cavity A of the matching cylinder is communicated with the cavity K of the well fluid through a three-way valve.
As a preferable scheme, the piston rod displacement measuring mechanism comprises a pointer and a scale corresponding to the pointer; the pointer is vertically and fixedly arranged at the end part of the piston rod; the scale is transversely fixed on the cylinder body.
Further, the piston rod displacement measuring mechanism comprises a signal acquisition module, a code bar, a signal processing module and a signal transmission module; the signal acquisition module is fixedly arranged at the end part of the piston rod; the code strip is transversely fixed on the cylinder body; the signal transmission port of the signal acquisition module is connected with the signal transmission port of the signal transmission module through the signal processing module.
Further, the packing bin is also provided with an upper end seat, a lower end seat, a pressing pad and a pressing cap; the upper end and the lower end of the rubber cylinder are fixedly clamped with the upper end seat and the lower end seat respectively; the upper end and the lower end of the shield are fixedly clamped with the upper end seat and the lower end seat respectively; the pressing pad is arranged on the packing and is positioned between the upper end seat and the cursor; the press cap is arranged on the press pad and is in threaded connection with the shell (104).
Furthermore, the oiling pressure F of the pressure cavity E is more than or equal to 0.2 and less than or equal to 0.8Mpa.
Further, the metering cavity C is provided with a plug.
Further, the rubber cylinder can be made of rubber, plastic or soft metal materials.
When the packing is installed, the packing bin pressing cap is screwed by a pretightening moment of about 15 kg force/m, the packing is compressed by the pressing pad, and the packing is installed, so that the installation strength is low compared with the existing polish rod packing sealing device; during normal operation, the pressure stored in the metering cavity D of the metering mechanism is transferred into the pressure cavity E of the packing bin through liquid, the packing element radially contracts under the action of the liquid pressure of the pressure cavity E, radial contraction pressure is generated on packing elements in the inner cavity of the packing element, under the action of the radial contraction pressure, the packing element and the polish rod generate sealing action, and the sealing action of the packing element is generated through radial force applied by the packing element, so that the traditional axial compression sealing mode is changed, and during reciprocating motion of the polish rod, superposition of axial compression force for sealing the packing element is avoided, friction force of the packing element in reciprocating motion is reduced, lubrication environment of the polish rod is improved, friction loss of the packing element is reduced, and service life of the packing element is prolonged; furthermore, when the packing is worn under the reciprocating motion of the polish rod, the inner diameter of the packing is increased, and the radial shrinkage pressure generated by the rubber cylinder under the energy storage pressure is used, so that the packing is continuously shrunk radially for automatic compensation sealing; further, the packing element in the packing bin is an elastomer, the external pressure cavity E of the packing element is filled with control oil, the physical deformation of the polish rod and the shaking generated during the reciprocating motion of the polish rod are caused, the packing element is driven by the polish rod to carry out abnormal extrusion on the dynamic state of the packing element, and the packing element drives the displacement motion of the packing element in the pressure cavity E to carry out compensation elimination; further, the pressure of the fluid in the well in the fluid K cavity enters the cavity of the matching cylinder A through the three-way valve, acts on the piston group of the pressure matching mechanism, obtains new pressure in the cavity of the matching cylinder B of the piston group of the pressure matching mechanism, transmits control oil to the metering cavity C of the metering mechanism and acts on the piston of the metering mechanism, and transmits the pressure obtained in the metering cavity D at the right part of the piston and the energy storage pressure generated by the spring of the metering mechanism to the pressure cavity E of the packing through oil, and the pressure acts on the packing outside the packing rubber cylinder to compress packing seal, so that packing sealing force of the packing is controlled by two pressures, one is the energy storage pressure formed by the compression spring of the piston of the metering mechanism, the pressure provides a reference sealing pressure for packing sealing, ensures no pressure or over-low pressure in the well and prevents packing from overflowing due to no sealing force; the other is that the pressure of the fluid in the well is transferred to the pressure cavity E of the packing bin through the metering mechanism after being converted by the matching mechanism, the pressure is changed along with the change of the pressure in the well, the pressure finally acting on the packing bin rubber cylinder is the optimal pressure after being matched by the matching mechanism, so that the friction force between the reciprocating motion of the polish rod and the packing is minimum on the premise of ensuring the packing bin packing sealing effect, the problem that the packing fastening force of the traditional packing box is not the basis is effectively solved, and the difficult problem that the leakage and even out-of-control blowout of the traditional packing box are extremely easy to occur when the pressure in the well is suddenly increased can be prevented; further, when packing in the packing bin is worn, the radial thickness of the packing becomes smaller, the outer packing is gradually contracted under the action of the pressure cavity E, the volume of the packing cavity E becomes larger, control oil in the metering cavity D of the metering mechanism flows into the pressure cavity E of the packing bin to be supplemented, the piston of the metering mechanism moves rightwards under the action of spring thrust and in-well conversion pressure, the piston rod of the metering mechanism drives the pointer to move rightwards, the pointer indicates scales on the scale, the scales on the scale correspond to the radial dimension wear degree of the packing bin, the more serious packing is worn, the larger the volume of the packing cavity E becomes, the larger the distance of the piston 407 of the metering mechanism moves rightwards, the leftmost scale on the scale 410 is expressed as a new packing state, the middle scale is expressed as an early warning state, the bottommost scale is in an immediate shutdown state, the pointer indicates that on-site inspection personnel provides visual packing use data, and the electrical signal converter corresponding to the lower side of the pointer can convert the finger state into a wired or wireless control signal.
Drawings
The invention is further described below with reference to the drawings and the detailed description. The scope of the present invention is not limited to the following description.
Fig. 1 is a schematic diagram of the overall structure of the present invention.
FIG. 2 is a schematic structural view of another embodiment of the piston rod displacement measuring mechanism of the present invention.
In the figure: 1. a filling bin; 2. packing; 3. a cursor; 4. a metering mechanism; 5. a pressure matching cylinder; 101. a pressing pad; 102. pressing the cap; 103. an upper end seat; 104. a housing; 105. a rubber cylinder; 106. a shield; 107. a lower gland; 108. a lower end seat; 109. an oil filling valve; 401. a cylinder cover; 402. a first seal ring; 403. a spring; 404. a cylinder; 405. plugging; 406. a second seal ring; 407. a piston; 408. a pointer; 409. fixing nails; 410. a ruler; 411. an electrical signal converter; 412. a piston rod; 413. a signal acquisition module; 414. coding bars; 415. a signal processing module; 416. a signal transmission module; 501. an upper cylinder cover; 502. a housing; 503. a third seal ring; 504. a fourth seal ring; 505. a piston group; 506. a lower cylinder cover; 507. and a three-way valve.
Detailed Description
As shown in fig. 1, the packing wear state monitoring device comprises a packing bin 1, a metering mechanism 4 and a pressure matching cylinder 5; the bottom of the filling bin 1 is fixedly connected with a wellhead component; the packing bin 1 comprises a shell 104, a shield 106, a rubber cylinder 105 and packing 2; the rubber cylinder 105 and the packing 2 are respectively arranged in the shell 104; the cursor 3 is positioned on the central axis of the shell 104; the packing 2 and the rubber cylinder 105 are sequentially sleeved with the cursor 3; the end part of the shield 106 is fixedly connected with the end part of the rubber cylinder 105; the inner wall of the shell 104 and the outer wall of the rubber cylinder 105 form a pressure cavity E; an oil filling valve 109 is fixedly arranged on the shell 104; the oil filling valve 109 communicates with the pressure chamber E.
The metering mechanism 4 comprises a cylinder 404, a piston 407 and a piston rod 412; the piston 407 divides the cylinder 404 into a metering chamber C and a metering chamber D; the metering cavity D is communicated with the pressure cavity E; within the metering chamber C, a spring 403 is provided above the piston rod 412; a piston rod displacement measuring mechanism is provided on the piston rod 412 and the cylinder 404.
The pressure matching cylinder 5 comprises a housing 502 and a piston group 505; the set of pistons 505 divides the housing 502 into a mating cylinder B cavity and a mating cylinder a cavity; the cavity of the matching cylinder B is communicated with the metering cavity C; the cavity A of the matching cylinder is communicated with the cavity K of the well fluid through a three-way valve 507.
The piston rod displacement measuring mechanism comprises a pointer 408 and a scale 410 corresponding to the pointer; the pointer 408 is vertically and fixedly arranged at the end part of the piston rod 412; the scale 410 is laterally fixed on the cylinder 404.
Referring to fig. 2, the piston rod displacement measuring mechanism of the present invention includes a signal acquisition module 413, a code bar 414, a signal processing module 415, and a signal transmission module 416; the signal acquisition module is fixedly arranged at the end part of the piston rod 412; the code strip 414 is transversely fixed on the cylinder 404; the signal transmission port of the signal acquisition module 413 is connected with the signal transmission port of the signal transmission module 416 through the signal processing module 415. When the piston rod 412 moves linearly, the piston rod 412 drives the signal acquisition module 413 (which may be a reflective photoelectric switch), and when the code bars with alternate brightness pass through the signal acquisition module 413, a corresponding pulse is generated, and the pulse signal is sent to the signal processing module 415 for processing, and then is transmitted remotely through the signal transmission module 416.
The packing bin 1 is also provided with an upper end seat 103, a lower end seat 108, a pressing pad 101 and a pressing cap 102; the upper end and the lower end of the rubber cylinder 105 are fixedly clamped with the upper end seat 103 and the lower end seat 108 respectively; the upper end and the lower end of the shield 106 are fixedly clamped with the upper end seat 103 and the lower end seat 108 respectively; the pressing pad 101 is arranged on the packing 2 and is positioned between the upper end seat 103 and the cursor 3; the press cap 102 is disposed on the press pad 101 and is screwed with the housing 104.
The oiling pressure F of the pressure cavity E is more than or equal to 0.2 and less than or equal to 0.8Mpa. The invention is provided with a plug 405 on the metering chamber C. The rubber cylinder 105 is made of rubber, plastic or soft metal materials.
The packing wear state monitoring device mainly comprises a filling bin 1, a metering mechanism 4 and a pressure matching cylinder 5; the packing bin 1 is connected with a wellhead component through threads at the left end of a lower gland 107, the lower gland 107 is connected with a shell 104 through threads, and a lower end seat 108, a shield 106, a rubber cylinder 105 and an upper end seat 103 are arranged in the shell 104 and the lower gland 107. The lower end seat 108 is connected with an inner boss at the lower end of the rubber cylinder 105 through an outer groove at the upper end, the rubber cylinder 105 is connected with an outer groove at the upper end of the upper end seat 103 through an inner boss at the upper end, the shield 106 is respectively connected with the lower end seat 108 and an outer clamping groove of the upper end seat 103 through inner bosses at the two ends, the shield 106 is integrally arranged in the shell 104, the upper end is limited with the shell 104 through the boss of the upper end seat 103, the lower end is pressed in the shell 104 through a lower pressing cover 107, further, the packing 2 is arranged on the cursor 3, the lower end is the lower end seat 108, the upper end is the pressing pad 101, the upper part of the pressing pad 101 is the pressing cap 102, the pressing cap 102 is connected with the shell 104 through threads, the pressing cap 102 is rotated downwards, the packing 2 can be compressed through the pressing pad 101, the adjustable packing 2 is provided with pre-tightening pressure, and the pre-tightening pressure is controlled to be about 15 kg; further, the shell 104 and the rubber cylinder 105 form a pressure cavity E, control oil can be injected through a one-way valve 109 on the right side of the shell 104, and the injection pressure is 0.2-0.8 Mpa and is used as the reference control pressure of the system; the metering mechanism 4 is positioned at the left side of the filling bin 1, is connected with a connector on the shell of the filling bin 1 through threads on the right side of the cylinder cover 401, the left end of the cylinder cover 401 is connected with the cylinder body 404 through threads, the piston 407 is arranged in the cylinder body 404, and a first sealing ring 402 is arranged between the piston 407 and the cylinder body 404; a second sealing ring 406 is arranged between the piston rod 412 and the cylinder 404; the spring 403 is installed on the piston rod 412, the pointer 408 is installed at the left end of the piston rod 412, fixed with the piston rod 412 through the fixing nail 409, the scale 410 is located at the lower side of the pointer 408, the pointer 408 is installed on the cylinder 404, the electric signal converter 411 is installed at the lower side of the scale, the pointer 408 can slide left and right in the scale range on the scale 410 under the drive of the left and right displacement of the piston rod 412, the electric signal converter 411 can convert the scale interval sliding of the pointer 408 on the scale into telecommunication for output, the telecommunication is transmitted to a remote control end through a wired or wireless means, the use state of the packing is remotely monitored, and remote management is carried out.
The packing wear state monitoring device of the invention has the working procedures that: installing the packing 2, fastening the pressing cap 102 downwards by using a force of about 15 kg, and compressing the packing by the pressing pad 101 under the action of the pushing force of the pressing cap 102 to finish the installation; the control oil is injected into the pressure cavity E through the check valve 109 on the right side of the filling bin 1, the control oil flows leftwards through the pressure cavity E to perform metering cavity D of the metering mechanism, the piston 407 in the metering mechanism 4 compresses the spring 403 to move leftwards under the action of the control oil, the piston rod 412 drives the pointer 408 to move leftwards, when the pointer 408 indicates the leftmost scale mark of the scale 410, the filling bin 1 finishes the injection of the control oil, the highest pressure is controlled to be about 0.8Mpa, and the pressure is stored by the metering mechanism 4; opening a plug 405 on a metering mechanism 4, injecting control oil into a metering cavity C, enabling the control oil to enter a matching cylinder B cavity of a pressure matching cylinder 5 through the metering cavity C, pushing a piston group 505 to move downwards to the lowest end of the matching cylinder B cavity, finishing the injection of the control oil into the metering cavity C of the metering mechanism, and fastening the plug 405 by taking full oil as a reference; when the polish rod 3 reciprocates to drive the underground oil pump to start working, the pressure in the well enters the matching cylinder A cavity from the well fluid K cavity through the three-way valve 507, the pressure in the fluid is converted through the piston group 505 and then is transferred to the metering cavity C through the matching cylinder B cavity, the metering cavity D obtains the resultant pressure force of the metering cavity C and the energy storage of the spring 403 and is transferred to the pressure cavity E through the control oil, the resultant pressure acts on the outside of the packing 105, the packing 2 generates shrinkage pressure under the action of the resultant force of the packing 105, the packing 2 generates sealing force on the polish rod 3 under the action of the shrinkage force of the packing 105, the fluid in the well is prevented from leaking, the sealing force is changed along with the pressure change in the well, the packing is prevented from being out of control under high pressure, the pressure of the packing is prevented from overflowing under the condition of about 0.8Mpa of the energy storage of the metering mechanism when the well is low pressure or no pressure, and the packing sealing work is controlled in the whole course; the packing 2 will wear normally under the friction of polished rod 3 reciprocating motion, after packing 2 wears, cause packing chamber volume to become smaller, rubber 105 takes place radial shrink under the control oil effect, pressure chamber E volume grow, metering chamber D control oil flows to pressure chamber E, piston 407 is under spring energy storage pressure and the pressure resultant force effect that the well fluid transmitted, piston 407 pole drives pointer 408 to move rightwards, so packing 2's wearing state is directly reacted to metering mechanism 4 pointer 408 end, and show with scale 410 scale, with signal conversion by the electrical signal converter, when pointer 408 moves rightwards and points to the early warning scale mark, packing 2 changes, the beam-pumping unit is shut down, the three-way valve 507 is closed, pressure matching jar 5 and well fluid passageway disconnection, simultaneously pressure matching jar A chamber is through three-way valve 507 and atmosphere, pressure cap 102 is released to matching jar A chamber, take out pressure pad 101 and packing 2, install new packing 2, down spin cap 102, new packing 2 produces radial promotion under the pressure effect of pad 101 and radially pushes packing 2 outwards, packing 2 changes, pressure cylinder diameter is opened to the scale 410, the packing is closed, the compression device is opened to the pressure is opened to the most, and the packing is compressed to the scale is opened, when packing 2 is compressed to the scale mark is opened, the normal state is opened, the packing is compressed to the packing is opened, the packing is closed, the packing is opened to be compressed to the volume is opened, and the packing is opened, and the pressure is opened.
In the description of the present invention, it should be understood that the terms "central axis," "bottom," "one end," "top," "middle," "other end," "upper," "one side," "top," "inner," "front," and "both ends," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "configured," "connected," "secured," "screwed," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The packing wear state monitoring device is characterized by comprising a filling bin (1), a metering mechanism (4) and a pressure matching cylinder (5); the bottom of the packing bin (1) is fixedly connected with a wellhead component through threads at the left end of a lower gland (107); the packing bin (1) comprises a shell (104), a shield (106), a rubber cylinder (105) and a packing (2); the rubber cylinder (105) and the packing (2) are respectively arranged in the shell (104); the cursor (3) is positioned on the central axis of the shell (104); the packing (2) and the rubber cylinder (105) are sequentially sleeved with the cursor (3); the end part of the shield (106) is fixedly connected with the end part of the rubber cylinder (105); the inner wall of the shell (104) and the outer wall of the rubber cylinder (105) form a pressure cavity E; an oil injection valve (109) is fixedly arranged on the shell (104); the oil filling valve (109) is communicated with the pressure cavity E;
The metering mechanism (4) comprises a cylinder body (404), a piston (407) and a piston rod (412); the piston (407) divides the cylinder body (404) into a metering cavity C and a metering cavity D; the metering cavity D is communicated with the pressure cavity E; a spring (403) is arranged above the piston rod (412) in the metering cavity C; a piston rod displacement measuring mechanism is arranged on the piston rod (412) and the cylinder body (404);
The pressure matching cylinder (5) comprises a shell (502) and a piston group (505); the piston group (505) divides the shell (502) into a matching cylinder B cavity and a matching cylinder A cavity; the cavity of the matching cylinder B is communicated with the metering cavity C; the cavity A of the matching cylinder is communicated with the cavity K of the well fluid through a three-way valve (507).
2. The packing wear state monitoring device of claim 1, wherein: the piston rod displacement measuring mechanism comprises a pointer (408) and a scale (410) corresponding to the pointer; the pointer (408) is vertically and fixedly arranged at the end part of the piston rod (412); the scale (410) is transversely fixed on the cylinder body (404).
3. The packing wear state monitoring device of claim 1, wherein: the piston rod displacement measuring mechanism comprises a signal acquisition module (413), a code strip (414), a signal processing module (415) and a signal transmission module (416); the signal acquisition module is fixedly arranged at the end part of the piston rod (412); the code strip (414) is transversely fixed on the cylinder body (404); the signal transmission port of the signal acquisition module (413) is connected with the signal transmission port of the signal transmission module (416) through the signal processing module (415).
4. A packing wear state monitoring device according to any one of claims 1 to 3, wherein: the packing bin (1) is also provided with an upper end seat (103), a lower end seat (108), a pressing pad (101) and a pressing cap (102); the upper end and the lower end of the rubber cylinder (105) are fixedly clamped with the upper end seat (103) and the lower end seat (108) respectively; the upper end and the lower end of the shield (106) are fixedly clamped with the upper end seat (103) and the lower end seat (108) respectively; the pressing pad (101) is arranged on the packing (2) and is positioned between the upper end seat (103) and the cursor (3); the press cap (102) is arranged on the press pad (101) and is in threaded connection with the shell (104).
5. The packing wear state monitoring device of claim 4, wherein: f is more than or equal to 0.2Mpa and less than or equal to 0.8Mpa.
6. The packing wear state monitoring device of claim 5, wherein: a plug (405) is provided on the metering chamber C.
7. The packing wear state monitoring device of claim 6, wherein: the rubber cylinder (105) is made of rubber, plastic or soft metal materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810526093.XA CN108489839B (en) | 2018-05-29 | 2018-05-29 | Packing wearing state monitoring device |
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| CN109990750B (en) * | 2019-04-18 | 2020-11-06 | 中铁隧道局集团有限公司 | Shield constructs machine cutter head wearing and tearing on-line measuring device |
| CN110006384B (en) * | 2019-04-18 | 2020-09-11 | 中铁隧道局集团有限公司 | Shield tunneling machine cutter head abrasion online measurement method |
| CN112067484A (en) * | 2020-09-10 | 2020-12-11 | 合肥普和普耐磨材料技术有限公司 | Rapid testing device and testing method for wear resistance of plastic product |
| CN114622895A (en) * | 2020-12-11 | 2022-06-14 | 中国石油化工股份有限公司 | Pumping unit polished rod eccentric wear alarm trigger device |
| CN113294114B (en) * | 2021-07-27 | 2021-10-08 | 东营浩辰石油技术开发有限公司 | Well head gate valve for oil development |
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