CN110306949B - Well head anti-theft sampling device - Google Patents
Well head anti-theft sampling device Download PDFInfo
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- CN110306949B CN110306949B CN201910584055.4A CN201910584055A CN110306949B CN 110306949 B CN110306949 B CN 110306949B CN 201910584055 A CN201910584055 A CN 201910584055A CN 110306949 B CN110306949 B CN 110306949B
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- fixed sleeve
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- 238000005070 sampling Methods 0.000 title claims abstract description 64
- 230000007246 mechanism Effects 0.000 claims abstract description 26
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims description 18
- 238000003780 insertion Methods 0.000 claims description 14
- 230000037431 insertion Effects 0.000 claims description 14
- 238000007789 sealing Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 8
- 210000002445 nipple Anatomy 0.000 description 8
- 239000003921 oil Substances 0.000 description 5
- 230000002265 prevention Effects 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- 230000008014 freezing Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000002627 tracheal intubation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B13/00—Spanners; Wrenches
- B25B13/48—Spanners; Wrenches for special purposes
- B25B13/50—Spanners; Wrenches for special purposes for operating on work of special profile, e.g. pipes
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- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/086—Withdrawing samples at the surface
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- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/04—Ball valves
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to an anti-theft sampling device for a wellhead, which comprises a sampling tube, wherein a three-way plug valve is fixed in the sampling tube, the three-way plug valve comprises a valve body, a spherical valve core and a valve rod for controlling the spherical valve core, a sheath is arranged at the periphery of the valve rod, the inner end of the sheath is in sealing connection with the valve body, the outer end of the sheath extends out of the sampling tube and exceeds the outer end of the valve rod, a valve rod square tenon is arranged at the outer end of the valve rod, a fixing sleeve is arranged at the middle section of the sheath, the fixing sleeve is coaxial with the sheath, the valve rod penetrates out of the center of the bottom wall of the fixing sleeve, and a valve rod control mechanism is arranged in the inner cavity of the fixing sleeve. The valve rod control mechanism comprises a lock cylinder coaxial with the fixed sleeve, the lock cylinder is of a T-shaped section, the large end of the lock cylinder is rotatably embedded in the inner cavity of the fixed sleeve, the small end of the lock cylinder is rotatably embedded in the inner cavity of the sheath, and the center of the lock cylinder is fixedly connected with the valve rod; the lock core is internally provided with a plurality of lock cavities, and the lock cavities are internally provided with locking mechanisms capable of locking or unlocking the lock core and the fixed sleeve. The wellhead anti-theft sampling device is convenient to operate and good in anti-theft performance.
Description
Technical Field
The invention relates to a sampling valve, in particular to a wellhead anti-theft sampling device, and belongs to the technical field of oil well wellhead sampling valves.
Background
At present, the sampling valve at the wellhead of an oil well is arranged on a vertical pipeline at the wellhead, any person on site can open the sampling valve by using a hand wheel or a wrench, and a thief can easily steal crude oil by opening the sampling valve, so that enterprises suffer unnecessary economic loss and the on site environmental pollution is easy to cause.
The Chinese patent application with the publication number of CN 104179500A discloses a built-in sampling device, which comprises a sampling tube, wherein two ends of the sampling tube are respectively connected with clamp heads, a three-way plug valve is fixed in the sampling tube and comprises a valve body, a spherical valve core and a valve rod, a horizontal inlet, a horizontal outlet on the same straight line with the horizontal inlet and a vertical outlet vertical to the horizontal inlet are arranged on the valve body, the horizontal inlet and the horizontal outlet of the three-way plug valve are coaxial with the sampling tube, a vertical output port of the three-way plug valve is connected with a sampling nipple, and the sampling nipple extends out of the sampling tube. The three-way plug valve is built-in, has a good heat preservation effect, is vertically arranged in the sampling nipple, does not leave residues in the sampling nipple after the sampling is completed, and avoids freezing blockage.
Because oil extraction plants are located in remote areas, the valve rod of the sampling valve is arranged in the sheath, but a thief can easily turn to the valve rod by adopting a simple tool to steal crude oil, so that the national assets are lost, and the improvement of the oil theft prevention performance of the sampling valve is a big problem of the oil extraction plants.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provide a wellhead anti-theft sampling device which has anti-freezing and anti-theft performances and is convenient and quick to sample.
In order to solve the technical problems, the wellhead anti-theft sampling device comprises a sampling tube, wherein a three-way plug valve is fixed in the sampling tube, the three-way plug valve comprises a valve body, a spherical valve core and a valve rod for controlling the spherical valve core, a sheath is arranged on the periphery of the valve rod, an inner end head of the sheath is fixed on the valve body, an outer end head of the sheath extends out of the sampling tube and exceeds an outer end head of the valve rod, a valve rod square tenon is arranged at the outer end head of the valve rod, a fixing sleeve is arranged in the middle section of the sheath, the fixing sleeve and the sheath are coaxial, the valve rod penetrates out from the center of the bottom wall of the fixing sleeve, and a valve rod control mechanism is arranged in an inner cavity of the fixing sleeve.
Compared with the prior art, the invention has the following beneficial effects: the three-way plug valve comprises an axial inlet and an axial outlet which are positioned on the axis of the sampling tube, and the radial output port is perpendicular to the axis of the sampling tube. In a non-sampling state, the axial inlet and the axial outlet of the three-way plug valve are communicated; during sampling, the spherical valve core is rotated by the valve rod, so that the axial inlet is communicated with the radial output port, and crude oil flows out from the sampling nipple. The valve rod is positioned in the inner cavity of the sheath, so that freezing and blocking are avoided; because the valve rod square tenon is positioned in the inner cavity of the sheath, the sealing cover is required to be removed, an operator can insert the valve rod square tenon into the inner cavity of the sheath by means of a special tool, and the valve rod square tenon rotates the valve rod, so that the sampling is smoothly carried out. The valve rod square tenon is internally provided with a first oil-theft prevention measure, the valve rod control mechanism and the fixed sleeve are provided with a second oil-theft prevention measure, and even if a thief uses a self-made tool to sleeve the valve rod square tenon, the valve rod control mechanism can not be operated, so that the valve rod can not be rotated, and the anti-theft performance is better.
As an improvement of the invention, the valve rod control mechanism comprises a lock cylinder coaxial with the fixed sleeve, the lock cylinder is in a T-shaped section, the large end of the lock cylinder is rotatably embedded in the inner cavity of the fixed sleeve, the small end of the lock cylinder is rotatably embedded in the inner cavity of the sheath, and the center of the lock cylinder is fixedly connected with the valve rod; the lock cylinder is internally provided with a plurality of lock cylinder lock cavities, and the lock cylinder lock cavities are internally provided with a locking mechanism capable of locking or unlocking the lock cylinder and the fixed sleeve. The lock cylinder with the T-shaped section automatically obtains axial positioning in the fixed sleeve, the lock cylinder can rotate in the fixed sleeve only after the locking mechanism is unlocked, and the valve rod can be operated to rotate because the lock cylinder is fixedly connected with the valve rod. When the locking mechanism is not unlocked, the lock cylinder is fixed in the fixed sleeve, and even if the valve rod is subjected to torsion, the valve rod still cannot be rotated.
As a further improvement of the invention, each lock cylinder lock cavity comprises a first lock core cavity and a second lock core cavity which are communicated with each other, wherein the first lock core cavity extends along the axial direction of the small end of the lock cylinder, and the second lock core cavity extends along the radial direction of the large end of the lock cylinder; the locking mechanism comprises pressing blocks, connecting rods and ejector blocks, wherein each pressing block is respectively positioned in a corresponding first core locking cavity and can slide along the axial direction of the first core locking cavity, the matched ejector block is positioned in a corresponding second core locking cavity and can slide along the radial direction of the second core locking cavity, one end of each connecting rod is hinged with the inner end surface of each pressing block, and the other end of each connecting rod is hinged with the inner end surface of each corresponding ejector block; the fixed sleeve is internally provided with a plurality of fixed sleeve lock cavities extending along the radial direction of the fixed sleeve, each fixed sleeve lock cavity is coaxial with the corresponding second lock cylinder cavity and is communicated smoothly, one fixed sleeve lock cavity is internally provided with a lock block capable of sliding along the fixed sleeve lock cavity, the front surface of the lock block is abutted against the corresponding jacking block, and the back surface of the lock block is supported at the bottom of the fixed sleeve lock cavity through a lock block spring; and a pressing block spring is respectively arranged between the inner end face of each pressing block and the bottom wall of the lock cylinder, each pressing block spring is close to the valve rod, and the axis of each pressing block spring is parallel to the axis of the valve rod. The fixed sleeve lock cavity provided with the lock block is a true lock cavity, and the rest is a false lock cavity; when the pressing block corresponding to the locking piece is extruded by external force, the pressing block slides along the first locking core cavity towards the large end direction of the lock cylinder, the pushing block is pushed to slide along the second locking core cavity towards the direction far away from the valve rod through the connecting rod, the locking piece is extruded by the pushing block, the locking piece is retracted towards the direction far away from the axis of the valve rod in the fixed sleeve locking cavity, when the locking piece just completely retracts into the fixed sleeve locking cavity, the contact surface of the locking piece and the pushing block is just positioned on the interface of the lock cylinder and the fixed sleeve, namely, the locking piece does not span between the interfaces of the lock cylinder and the fixed sleeve any more, and at the moment, the locking piece is in an unlocking state. And if any pressing block corresponding to the false lock cavity is extruded by external force, the corresponding top block is inserted into the empty fixed sleeve lock cavity, namely the top block stretches across the interface between the lock cylinder and the fixed sleeve to lock the lock cylinder. Only if the lock block of the true lock cavity is in an unlocking state, and meanwhile, the other false lock cavities cannot be inserted with the top blocks, the lock cylinder can be unlocked, and the valve rod can rotate under the unlocking state. When the pressing block is subjected to external pressure, the pressing block spring is compressed to store energy; when the pressure born by the pressing block disappears, the tension of the pressing block spring pushes the pressing block to automatically reset; the tension of the lock block spring pushes the lock block out, and the lock block returns to a state crossing the interface between the lock cylinder and the fixed sleeve to lock the lock cylinder again. The thief faces four elastic pressing blocks, and it is difficult to think that three pressing blocks cannot be pressed, and if any pressing block matched with the false lock cavity is pressed, the top block is inserted into the false lock cavity, and then the lock cylinder is locked. The pressing block matched with the true lock cavity is required to be pressed to an accurate depth, the lock block is not unlocked if the pressing block is not pressed in place, and the lock core is locked if the pressing block is too much inserted into the lock cavity, so that the anti-theft performance is more excellent.
As a further improvement of the invention, the inner end surface of the pressing block is fixedly connected with a cannula inserted into the pressing block spring, the inner cavity of the free end of the cannula is inserted with a plunger rod coaxial with the cannula, and the root of the plunger rod is fixedly connected to the bottom wall of the lock cylinder. When the pressing block is pressed to compress the pressing block spring, the depth of the free end of the inserted rod inserted into the insertion pipe is increased; when the pressing block is pressed and disappears, the pressing block spring pushes the pressing block to reset, and the inserting depth of the inserting rod in the insertion pipe becomes shallow; under the action of the insertion pipe and the insertion rod, the pressing block spring is always compressed or stretched along the axis of the pressing block spring, and the skew failure phenomenon can not occur.
As a further improvement of the invention, the periphery of the valve rod is provided with a valve rod groove extending along the axial direction of the valve rod, and the side surface of each pressing block contacted with the valve rod is respectively embedded in the corresponding valve rod groove. The valve rod groove plays a guiding role in sliding of the pressing block, and meanwhile, the step at the outer end of the valve rod groove limits the pressing block, so that the pressing block is prevented from continuously sliding outwards, and the outer limit position of the pressing block is formed.
As a further improvement of the invention, the locking mechanism is matched with a special spanner, the special spanner comprises a spanner body, a spanner hole which is matched with and communicated with the square tenon of the valve rod is arranged in the center of the spanner body, the outer end face of the spanner body is connected with a handle, and a spanner pressing rod is arranged on the circumference of the inner end face of the spanner body; when the spanner press rod pushes the press block corresponding to the lock block to the bottom, the front surface of the lock block is flush with the port of the lock cavity of the fixed sleeve towards the core side. The operator holds the handle, aim at the briquetting inwards extrusion that corresponds with true lock chamber with spanner depression bar, the in-process that the briquetting forced retreats, spanner hole cover is on valve rod square tenon and continue to advance to the root of valve rod square tenon, when spanner hole impels to the bottom, spanner depression bar impels the briquetting to interior extreme position, the briquetting is with the kicking block impel into place through the connecting rod this moment, the front of each locking piece is in parallel and level with the core side port of fixed cover lock chamber this moment, lock core is in the unblock position promptly, rotate handle can twist valve rod square tenon and lock core, make the valve rod rotate spherical case to the oil position of taking a sample.
As a further improvement of the invention, the front surface of the locking piece is provided with a locking piece mushroom head with high middle and low periphery, and the outer end of the top piece matched with the locking piece is provided with a top piece mushroom head with high middle and low periphery. The top block mushroom head and the locking block mushroom head not only ensure good contact between the top block and the locking block, but also allow reasonable errors in the positions of the locking blocks, namely if the top points of the locking blocks are not absolutely flush with the core side ports of the fixed sleeve lock cavity, small errors exist, the outer ports of the second lock core cavity are contacted with the cambered surfaces of the locking block mushroom head, and the locking blocks can be completely pushed into the fixed sleeve lock cavity, so that the lock cylinder can rotate. Similarly, if the top block mushroom head slightly protrudes into the fixed sleeve lock cavity, when the lock cylinder rotates, the cambered surface of the top block mushroom head scrapes to the port of the fixed sleeve lock cavity and can be propped back into the second lock core cavity; the problem that an operator can hardly open the three-way plug valve to sample due to too high matching precision is avoided.
As a further improvement of the invention, the shape, the size and the initial position of each pressing block are the same, the length of each connecting rod is the same, and the outer end face of the top block of the non-matched locking block is a plane and is flush with the outer end face of the corresponding second locking core cavity. The initial state of each briquetting is the same, has the confusing nature more, and when special spanner used, must guarantee the exact orientation, makes spanner depression bar must aim at accurate briquetting, just probably unblock lock core. Because the three jacking blocks matched with the false lock cavity are provided with the flat end heads and are in critical positions, the length of the three jacking blocks is longer than that of the jacking block attached to the lock block, and the jacking block with the flat end heads is inserted into the false lock cavity only by slightly being pressed, so that the lock cylinder is firmly locked, and the anti-theft performance is better.
Drawings
The invention will now be described in further detail with reference to the drawings and the detailed description, which are provided for reference and illustration only and are not intended to limit the invention.
FIG. 1 is a schematic diagram of a wellhead anti-theft sampling device.
Fig. 2 is an enlarged view of the portion a in fig. 1.
Fig. 3 is an enlarged view of the portion of the lock cylinder of fig. 2.
Fig. 4 is a port view of the sheath of fig. 1 with the cover removed.
Fig. 5 is a front view of the special wrench.
Fig. 6 is a right side view of the wrench body of fig. 5.
In the figure: 1. a sampling tube; 2. a three-way plug valve; 2a, a valve body; 2b, a spherical valve core; 2c, valve rod; 2c1, valve rod square tenons; 2c2, a valve rod groove; 3. sampling pup joint; 4. a sheath; 5. a fixed sleeve; 5a, fixing a sleeve lock cavity; 6. a lock core; 6a, a first lock core cavity; 6b, a second lock core cavity; 7. briquetting; 8. a connecting rod; 9. a top block; 9a, top mushroom head; 10. a briquetting spring; 10a, intubation; 10b, inserting a rod; 11. a locking piece; 11a, locking a mushroom head; 12. a lock block spring; 13. a cover; 14a, a wrench body; 14b, spanner holes; 14c, a spanner pressing rod; 14d, a handle.
Detailed Description
As shown in fig. 1 to 4, the wellhead anti-theft sampling device comprises a sampling tube 1, a three-way plug valve is fixed in the sampling tube 1, the three-way plug valve 2 comprises a valve body 2a, a spherical valve core 2b and a valve rod 2c for controlling the spherical valve core 2b, a sampling nipple 3 is arranged in a radial output port of the three-way plug valve 2, an outer end of the sampling nipple 3 extends out of the sampling tube 1 along the radial direction of the sampling tube 1, a sheath 4 is arranged on the periphery of the valve rod 2c, an inner end of the sheath 4 is fixed on the valve body 2a, an outer end of the sheath 4 extends out of the sampling tube 1 and exceeds an outer end of the valve rod 2c, a valve rod square tenon 2c1 is arranged at an outer end of the valve rod 2c, and a sealing cover 13 is screwed on an outer port of the sheath 4. The middle section of the sheath 4 is provided with a fixed sleeve 5, the fixed sleeve 5 is coaxial with the sheath 4, the valve rod 2c penetrates out of the center of the bottom wall of the fixed sleeve 5, and the inner cavity of the fixed sleeve 5 is provided with a valve rod control mechanism.
The three-way plug valve 2 comprises an axial inlet and an axial outlet which are positioned on the axis of the sampling tube, and the radial output port is perpendicular to the axis of the sampling tube. In the non-sampling state, the axial inlet and the axial outlet of the three-way plug valve 2 are communicated; during sampling, the spherical valve core 2b is rotated through the valve rod 2c, so that the axial inlet is communicated with the radial outlet, and crude oil flows out from the sampling nipple 3. The valve rod 2c is positioned in the inner cavity of the sheath 4, so that freezing and blocking are avoided; since the valve stem square tenon 2c1 is positioned in the inner cavity of the sheath 4, the sealing cover 13 must be removed, an operator can insert the valve stem square tenon 2c1 into the inner cavity of the sheath by means of a special tool, and the valve stem square tenon 2c1 rotates the valve stem 2c, so that the sampling can be smoothly performed. The valve rod square tenon 2c1 is internally provided with a first oil-theft prevention measure, the fixed sleeve 5 and the valve rod control mechanism are provided with a second oil-theft prevention measure, and even if a thief uses a self-made tool to sleeve the valve rod square tenon 2c1, the valve rod control mechanism can not be operated, so that the valve rod 2c can not be rotated, and the anti-theft performance is better.
The valve rod control mechanism comprises a lock cylinder 6 coaxial with the fixed sleeve 5, the lock cylinder 6 is of a T-shaped section, the large end of the lock cylinder 6 is rotatably embedded in the inner cavity of the fixed sleeve 5, the small end of the lock cylinder 6 is rotatably embedded in the inner cavity of the sheath 4, and the center of the lock cylinder 6 is fixedly connected with the valve rod 2 c; the lock core 6 is provided with a plurality of lock core lock cavities, and a locking mechanism capable of locking or unlocking the lock core 6 and the fixed sleeve 5 is arranged in the lock core lock cavities. The lock cylinder 6 with the T-shaped section automatically obtains axial positioning in the fixed sleeve 5, and the lock cylinder 6 can rotate in the fixed sleeve 5 only after the locking mechanism is unlocked, and the valve rod 2c can be operated to rotate because the lock cylinder 6 is fixedly connected with the valve rod 2c. When the locking mechanism is not unlocked, the lock cylinder 6 is fixed in the fixed sleeve 5, and cannot be rotated even if the valve stem 2c is subjected to torsion.
Each lock cylinder lock cavity comprises a first lock core cavity 6a and a second lock core cavity 6b which are communicated with each other, wherein the first lock core cavity 6a extends along the axial direction of the small end of the lock cylinder, and the second lock core cavity 6b extends along the radial direction of the large end of the lock cylinder; the locking mechanism comprises pressing blocks 7, connecting rods 8 and ejector blocks 9, each pressing block 7 is respectively positioned in a corresponding first core locking cavity 6a and can slide along the axial direction of the first core locking cavity 6a, the matched ejector block 9 is positioned in a corresponding second core locking cavity 6b and can slide along the radial direction of the second core locking cavity 6b, one end of each connecting rod 8 is hinged with the inner end surface of each pressing block 7, and the other end of each connecting rod 8 is hinged with the inner end surface of the corresponding ejector block 9; the fixed sleeve 5 is provided with a plurality of fixed sleeve lock cavities 5a extending along the radial direction of the fixed sleeve 5, each fixed sleeve lock cavity 5a is coaxial with and is communicated with a corresponding second lock core cavity 6b in a smooth way, one fixed sleeve lock cavity 5a is provided with a lock block 11 capable of sliding along the fixed sleeve lock cavity 5a, the front surface of the lock block 11 is propped against a corresponding top block 9, and the back surface of the lock block 11 is supported at the bottom of the fixed sleeve lock cavity 5a through a lock block spring 12; a pressing block spring 10 is respectively arranged between the inner end surface of each pressing block 7 and the bottom wall of the lock cylinder 6, each pressing block spring 10 is close to the valve rod 2c, and the axis of each pressing block spring 10 is parallel to the axis of the valve rod 2c.
The fixed sleeve lock cavity 5a provided with the lock block 11 is a true lock cavity, and the rest are false lock cavities; when the pressing block 7 corresponding to the locking block 11 is extruded by external force, the pressing block 7 slides along the first core cavity 6a towards the large end direction of the lock cylinder 6, and pushes the top block 9 to slide along the second core cavity 6b towards the direction away from the valve rod 2c through the connecting rod 8, the locking block 11 is extruded by the top block 9, and is retracted in the fixed sleeve lock cavity 5a towards the direction away from the axis of the valve rod, when the locking block 11 is just completely retracted into the fixed sleeve lock cavity 5a, the contact surface of the locking block 11 and the top block 9 is just positioned on the interface of the lock cylinder 6 and the fixed sleeve 5, namely, the locking block 11 does not span between the interfaces of the lock cylinder 6 and the fixed sleeve 5 any more, and at the moment, the locking block 11 is in an unlocking state.
Any pressing block 7 corresponding to the false lock cavity is also extruded by external force, and the corresponding top block 9 is inserted into the empty fixed sleeve lock cavity 5a, namely the top block 9 spans across the interface between the lock cylinder 6 and the fixed sleeve 5 to lock the lock cylinder 6. Only if the lock block 11 of the true lock cavity is in the unlocking state, and the rest of the false lock cavities cannot be inserted by the top block 9, the lock cylinder 6 can be unlocked, and the valve rod 2c can be rotated only when the lock cylinder 6 is in the unlocking state.
When the pressing block 7 is subjected to external pressure, the pressing block spring 10 is compressed to store energy; when the pressure born by the pressing block 7 disappears, the tension of the pressing block spring 10 pushes the pressing block 7 to reset automatically; the tension of the lock block spring 12 pushes the lock block 11 out, and the lock block 11 returns to a state crossing the interface of the lock cylinder 6 and the fixing sleeve 5 to re-lock the lock cylinder 6.
The thief faces four elastic pressing blocks 7, and it is difficult to think that three pressing blocks cannot be pressed, and if any pressing block matched with the false lock cavity is pressed, the top block 9 is inserted into the false lock cavity, so that the lock cylinder 6 is locked. The pressing block matched with the true lock cavity is required to be pressed to an accurate depth, the lock block 11 is not unlocked if the pressing block is not pressed in place, and the lock core 6 is locked after the top block 9 is inserted into the lock cavity if the pressing block is pressed too far, so that the anti-theft performance is more excellent.
The inner end surface of the pressing block 7 is fixedly connected with a cannula 10a inserted into the pressing block spring 10, the inner cavity of the free end of the cannula 10a is inserted with a plunger rod 10b coaxial with the cannula 10a, and the root of the plunger rod 10b is fixedly connected to the bottom wall of the lock cylinder 6. When the pressing block 7 is pressed to compress the pressing block spring 10, the free end of the inserted rod 10b is inserted into the insertion tube 10a to a deeper depth; when the pressing block 7 is pressed and disappears, the pressing block spring 10 pushes the pressing block 7 to reset, and the insertion depth of the inserted rod 10b in the insertion tube 10a becomes shallow; under the action of the insertion tube 10a and the insertion rod 10b, the pressing block spring 10 is always compressed or stretched along the axis of the pressing block spring, and no skew failure phenomenon occurs.
The outer periphery of the valve rod 2c is provided with a valve rod groove 2c2 extending along the axial direction of the valve rod, and the side surface of each pressing block 7 contacted with the valve rod 2c is respectively embedded in the corresponding valve rod groove 2c. The valve rod groove 2c2 plays a guiding role in sliding of the pressing block 7, and meanwhile, the step at the outer end of the valve rod groove 2c2 limits the pressing block 7, so that the pressing block 7 is prevented from continuously sliding outwards, and the outer limit position of the pressing block 7 is formed.
The front of the locking piece 11 is provided with a locking piece mushroom head 11a with high middle and low periphery, and the outer end of the top piece 9 matched with the locking piece 11 is provided with a top piece mushroom head 9a with high middle and low periphery. The top block mushroom head 9a and the locking block mushroom head 11a not only ensure good contact between the top block 9 and the locking block 11, but also allow reasonable errors in the position of the locking block 11, i.e. if the top point of the locking block 11 is not absolutely flush with the core-side port of the fixed sleeve lock cavity 5a, but there is a small error, the outer port of the second lock core cavity 6b contacts the cambered surface of the locking block mushroom head 11a, so that the locking block 11 can be completely pushed into the fixed sleeve lock cavity 5a, and the lock core 6 can rotate. Similarly, if the top block mushroom head 9a slightly protrudes into the fixed sleeve lock cavity 5a, when the lock cylinder 6 rotates, the cambered surface of the top block mushroom head 9a scrapes the port of the fixed sleeve lock cavity 5a and can be pushed back into the second lock core cavity 6 b; the problem that an operator can hardly open the three-way plug valve 2 to sample due to too high matching precision is avoided.
The shape and the size of each pressing block 7 are the same as those of the initial positions, the lengths of the connecting rods 8 are the same, and the outer end surfaces of the top blocks 9 of the non-matched locking blocks 11 are plane and are flush with the outer end surfaces of the corresponding second locking core cavities 6b. The initial state of each press block 7 is the same, so that the lock core 6 can be unlocked more easily, and when the special spanner is used, the correct direction must be ensured, so that the spanner press rod 14c must be aligned with the accurate press block 7. Because the three jacking blocks matched with the false lock cavity are provided with the flat end heads and are in critical positions, the length of the three jacking blocks is longer than that of the jacking block 9 attached to the lock block 11, and the jacking block 9 with the flat end heads is inserted into the false lock cavity only by slightly being pressed, so that the lock cylinder 6 is firmly locked, and the anti-theft performance is better.
As shown in fig. 5 and 6, the locking mechanism is provided with a special wrench, the special wrench comprises a wrench body 14a, a wrench hole 14b which is matched with and penetrates through the valve rod square tenon 2c1 is formed in the center of the wrench body 14a, and a handle 14d is connected to the outer end face of the wrench body 14a. A wrench pressing rod 14c is arranged on the circumference of the inner end surface of the wrench body 14 a; when the key lever 14c pushes the pressing block 7 corresponding to the lock block 11 to the bottom, the front face of the lock block 11 is flush with the core-facing side port of the fixed boot lock chamber 5a.
The operator holds the handle 14d, the spanner pressure bar 14c is aligned with the pressing block 7 corresponding to the true lock cavity and is pressed inwards, in the process that the pressing block 7 is forced to retreat, the spanner hole 14b is sleeved on the valve rod square tenon 2c1 and continuously pushes the spanner pressure bar to the root of the valve rod square tenon 2c1, when the spanner hole 14b is pushed to the bottom, the spanner pressure bar 14c pushes the pressing block 7 to an inner limit position, at the moment, the pressing block 7 pushes the jacking block 9 to be in place through the connecting rod 8, at the moment, the front face of each locking block 11 is flush with a core side port of the fixed sleeve lock cavity 5a, namely, the lock cylinder 6 is in an unlocking position, and the valve rod square tenon 2c1 and the lock cylinder 6 can be screwed by rotating the handle 14d, so that the valve rod 2c rotates the spherical valve core 2b to a sampling oil outlet position.
The foregoing description is only of a preferred embodiment of the invention and is not intended to limit the scope of the invention. In addition to the embodiments described above, other embodiments of the invention are possible. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention. The technical features of the present invention that are not described may be implemented by or using the prior art, and are not described herein.
Claims (6)
1. The utility model provides a well head theftproof sampling device, includes the sampling tube, be fixed with the tee bend plug valve in the sampling tube, the tee bend plug valve includes valve body, spherical case and the valve rod of control spherical case, its characterized in that: the periphery of the valve rod is provided with a sheath, the inner end head of the sheath is fixed on the valve body, the outer end head of the sheath extends out of the sampling tube and exceeds the outer end head of the valve rod, the outer end head of the valve rod is provided with a valve rod square tenon, the middle section of the sheath is provided with a fixed sleeve, the fixed sleeve and the sheath are coaxial, the valve rod penetrates out of the center of the bottom wall of the fixed sleeve, and the inner cavity of the fixed sleeve is provided with a valve rod control mechanism;
the valve rod control mechanism comprises a lock cylinder coaxial with the fixed sleeve, the lock cylinder is of a T-shaped section, the large end of the lock cylinder is rotatably embedded in the inner cavity of the fixed sleeve, the small end of the lock cylinder is rotatably embedded in the inner cavity of the sheath, and the center of the lock cylinder is fixedly connected with the valve rod; the lock cylinder is internally provided with a plurality of lock cylinder lock cavities, and the lock cylinder lock cavities are internally provided with a locking mechanism capable of locking or unlocking the lock cylinder and the fixed sleeve;
each lock core lock cavity comprises a first lock core cavity and a second lock core cavity which are communicated with each other, wherein the first lock core cavity extends along the axial direction of the small end of the lock core, and the second lock core cavity extends along the radial direction of the large end of the lock core; the locking mechanism comprises pressing blocks, connecting rods and ejector blocks, wherein each pressing block is respectively positioned in a corresponding first core locking cavity and can slide along the axial direction of the first core locking cavity, the matched ejector block is positioned in a corresponding second core locking cavity and can slide along the radial direction of the second core locking cavity, one end of each connecting rod is hinged with the inner end surface of each pressing block, and the other end of each connecting rod is hinged with the inner end surface of each corresponding ejector block; the fixed sleeve is internally provided with a plurality of fixed sleeve lock cavities extending along the radial direction of the fixed sleeve, each fixed sleeve lock cavity is coaxial with the corresponding second lock cylinder cavity and is communicated smoothly, one fixed sleeve lock cavity is internally provided with a lock block capable of sliding along the fixed sleeve lock cavity, the front surface of the lock block is abutted against the corresponding jacking block, and the back surface of the lock block is supported at the bottom of the fixed sleeve lock cavity through a lock block spring; and a pressing block spring is respectively arranged between the inner end face of each pressing block and the bottom wall of the lock cylinder, each pressing block spring is close to the valve rod, and the axis of each pressing block spring is parallel to the axis of the valve rod.
2. The wellhead anti-theft sampling device of claim 1, wherein: the inner end face of the pressing block is fixedly connected with an insertion pipe inserted into the pressing block spring, an insertion rod coaxial with the insertion pipe is inserted into the inner cavity of the free end of the insertion pipe, and the root of the insertion rod is fixedly connected to the bottom wall of the lock cylinder.
3. The wellhead anti-theft sampling device of claim 1, wherein: the periphery of the valve rod is provided with a valve rod groove extending along the axial direction of the valve rod, and the side surfaces of the pressing blocks, which are contacted with the valve rod, are respectively embedded in the corresponding valve rod groove.
4. The wellhead anti-theft sampling device of claim 1, wherein: the locking mechanism is matched with a special spanner, the special spanner comprises a spanner body, a spanner hole which is matched with and communicated with the square tenon of the valve rod is formed in the center of the spanner body, the outer end face of the spanner body is connected with a handle, and a spanner pressing rod is arranged on the circumference of the inner end face of the spanner body; when the spanner press rod pushes the press block corresponding to the lock block to the bottom, the front surface of the lock block is flush with the port of the lock cavity of the fixed sleeve towards the core side.
5. The wellhead anti-theft sampling device according to any of claims 1 to 4, characterized in that: the front of the locking piece is provided with a locking piece mushroom head with high middle and low periphery, and the outer end of the top piece matched with the locking piece is provided with a top piece mushroom head with high middle and low periphery.
6. The wellhead anti-theft sampling device according to any of claims 1 to 4, characterized in that: the shape and the size of each pressing block are the same as the initial position, the lengths of the connecting rods are the same, and the outer end face of the top block of the non-matched locking block is a plane and is flush with the outer end face of the corresponding second locking core cavity.
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| CN201910584055.4A CN110306949B (en) | 2019-07-01 | 2019-07-01 | Well head anti-theft sampling device |
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| CN201910584055.4A CN110306949B (en) | 2019-07-01 | 2019-07-01 | Well head anti-theft sampling device |
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| CN113153217B (en) * | 2021-05-24 | 2022-08-26 | 重庆新泰机械有限责任公司 | Remote control-based oil testing and oil and gas production wellhead device |
| CN116255106B (en) * | 2022-12-12 | 2024-05-24 | 江苏金石机械集团有限公司 | Anti-theft integrated oil extraction gas wellhead device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1865652A (en) * | 2005-05-16 | 2006-11-22 | 盐城市三正机械有限公司 | Anti-theft sampling valve |
| CN201031695Y (en) * | 2007-01-20 | 2008-03-05 | 张雪明 | Anti-theft enclosed sample valve |
| US8181931B2 (en) * | 2009-01-06 | 2012-05-22 | Vetco Gray Inc. | Mechanically operated hydraulic valve actuator |
| CN203239280U (en) * | 2013-03-01 | 2013-10-16 | 中国石油天然气股份有限公司 | Anti-theft anti-freezing sampling valve |
| CN103266866A (en) * | 2013-03-01 | 2013-08-28 | 中国石油天然气股份有限公司 | Key needle tube type anti-theft anti-freezing sampling valve |
| CN104453885A (en) * | 2013-09-18 | 2015-03-25 | 中国石油天然气股份有限公司 | Antifreezing, antitheft and emptying-free oil well sampling device |
| CN104179500A (en) * | 2014-07-25 | 2014-12-03 | 中国石油化工股份有限公司 | Built-in type sampling device |
| GB2546390B (en) * | 2015-12-17 | 2020-04-22 | Schlumberger Technology Bv | Double rod lock system |
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