CN116498258B - Floating collar floating shoe with backflow preventing function for well cementation construction - Google Patents
Floating collar floating shoe with backflow preventing function for well cementation construction Download PDFInfo
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- CN116498258B CN116498258B CN202310777309.0A CN202310777309A CN116498258B CN 116498258 B CN116498258 B CN 116498258B CN 202310777309 A CN202310777309 A CN 202310777309A CN 116498258 B CN116498258 B CN 116498258B
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- sliding
- fixedly connected
- connecting plate
- shell
- valve seat
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- 238000007667 floating Methods 0.000 title claims abstract description 19
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 49
- 238000007789 sealing Methods 0.000 claims abstract description 35
- 238000001125 extrusion Methods 0.000 claims abstract description 29
- 230000008878 coupling Effects 0.000 claims abstract description 24
- 238000010168 coupling process Methods 0.000 claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 claims abstract description 24
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 21
- 230000002265 prevention Effects 0.000 claims abstract description 13
- 230000000670 limiting effect Effects 0.000 claims description 23
- 230000007246 mechanism Effects 0.000 claims description 19
- 239000003921 oil Substances 0.000 claims description 8
- 239000013013 elastic material Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000001174 ascending effect Effects 0.000 abstract 1
- 239000002002 slurry Substances 0.000 description 32
- 238000000034 method Methods 0.000 description 12
- 230000008569 process Effects 0.000 description 11
- 239000011440 grout Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Earth Drilling (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention relates to the technical field of downhole tools, and discloses a floating collar floating shoe with a backflow prevention function for well cementation construction. Including the connection shell, the inner wall rigid coupling of connection shell has the disk seat, the inner wall rigid coupling of connection shell has the backup pad, the backup pad is located the below of disk seat, backup pad sliding connection has the slip post, the slip post rigid coupling has the case with disk seat sealing fit, the inner ring face of disk seat is provided with the ring channel, ring channel department rigid coupling and sealing connection of disk seat have annular diaphragm, annular diaphragm and disk seat cooperation form an annular cavity in ring channel department, the annular cavity intussuseption of ring channel and annular diaphragm is filled with hydraulic oil, the upside rigid coupling of case has the fixed block, annular diaphragm and fixed block extrusion fit. The annular diaphragm is extruded on the inclined plane of fixed block, and the fixed block receives ascending extrusion force, makes the fixed block drive the case upwards to extrude the disk seat, and then improves the leakproofness between disk seat and the case, has improved the quality of well cementation, prevents that cement paste from flowing backward in the sleeve pipe again.
Description
Technical Field
The invention relates to the technical field of downhole tools, and particularly discloses a floating collar floating shoe with a backflow prevention function for well cementation construction.
Background
The well cementation is an important link in petroleum drilling operation, cement slurry is required to be injected into a well hole to strengthen the well wall during petroleum drilling operation, in the process, the floating collar floating shoe is used as an auxiliary tool, cement slurry can be prevented from flowing into a measuring tool and flowing back to the well surface, the efficiency and quality of well cementation construction can be improved by using the floating collar floating shoe, and the safety and stability of well cementation are ensured.
After grouting is completed, the sealing valve core simply abuts against the sealing valve seat to block the grouting hole by means of the elasticity of the spring, under the complex working condition of high temperature and high pressure in the pit, the problem that the sealing is not tight exists when the existing float collar float shoe is applied, leakage of cement paste and even backflow of the cement paste are easily caused, well cementation quality is affected, and well cementation operation failure can be caused when the existing float collar float shoe is severe.
Disclosure of Invention
In order to overcome the defects in the background art, the invention provides a floating collar floating shoe with a backflow prevention function for well cementation construction.
The technical scheme of the invention is as follows: the floating collar float shoe with the anti-backflow function for well cementation construction comprises a connecting shell, wherein the inner wall of the connecting shell is fixedly connected with a valve seat, the inner wall of the connecting shell is fixedly connected with a supporting plate, the supporting plate is positioned below the valve seat, a sliding column is slidably connected with the supporting plate, the sliding column is fixedly connected with a valve core matched with the valve seat in a sealing manner, a first elastic piece is sleeved on the sliding column, two ends of the first elastic piece are in extrusion contact with the supporting plate and the valve core, an annular groove is formed in the inner annular surface of the valve seat, an annular diaphragm is fixedly connected with the annular groove of the valve seat in a sealing manner, the annular diaphragm and the valve seat are matched at the annular groove to form an annular cavity, hydraulic oil is filled in the annular groove and the annular cavity of the annular diaphragm, the upper side of the valve core is fixedly connected with a fixed block, the annular diaphragm is in extrusion fit with the fixed block, the valve seat is provided with a pressure sealing assembly, and the pressure sealing assembly adjusts the pressure of the hydraulic oil in the annular cavity of the annular diaphragm according to the pressure of cement paste on the upper side and lower side of the valve seat;
the pressure seal assembly comprises sliding pipes distributed at equal intervals in the circumferential direction, the sliding pipes distributed at equal intervals in the circumferential direction are connected to the valve seat in a penetrating mode, the valve seat is provided with cylindrical cavities at equal intervals in the circumferential direction, the sliding pipes penetrate through the adjacent cylindrical cavities, the cylindrical cavities are communicated with the annular grooves, piston plates are fixedly connected to the sliding pipes, the piston plates are connected to the adjacent cylindrical cavities in a sliding mode, second elastic pieces are arranged in the cylindrical cavities in a sleeved mode, the two ends of the second elastic pieces are fixedly connected with the adjacent piston plates and the valve seat respectively, first connecting plates are fixedly connected to the upper ends of the sliding pipes distributed at equal intervals in the circumferential direction, second connecting plates are fixedly connected to the lower ends of the sliding pipes distributed at equal intervals in the circumferential direction, and the first connecting plates and the second connecting plates are all connected with the connecting shells in a sliding mode.
Further, the annular diaphragm is made of polyurethane elastic materials and used for improving the tightness between the annular diaphragm and the fixed block.
Further, the fixed block is arranged in a frustum shape and is used for changing the extrusion direction of the annular diaphragm to the fixed block.
Further, sealing rings are arranged on the outer ring surfaces of the first connecting plate and the second connecting plate, and are used for improving the tightness of the first connecting plate, the second connecting plate and the connecting shell.
Further, the valve seat is provided with the protection subassembly that is used for protecting annular diaphragm, and the protection subassembly is including the protecting crust, and protecting crust sliding connection is in the valve seat, and the upper end and the first connecting plate rigid coupling of protecting crust, the downside rigid coupling of valve seat have first fixed shell, second connecting plate and first fixed shell sliding connection and sealed cooperation.
Further, still including the anti-pressure failure mechanism that prevents first elastic component inefficacy, anti-pressure failure mechanism sets up in the disk seat, anti-pressure failure mechanism is including the equidistant slide bar that distributes in circumference, equidistant slide bar of circumference is sliding connection respectively in adjacent slide tube, the slide bar passes first connecting plate and second connecting plate, slide bar and first connecting plate and second connecting plate sliding fit, the upper end rigid coupling of equidistant slide bar of circumference has the third connecting plate, the lower extreme rigid coupling of equidistant slide bar of circumference has the fourth connecting plate, fourth connecting plate and first fixed shell and coupling shell sliding connection and sealing fit, the lower part cover of slide bar is equipped with the third elastic component, the both ends of third elastic component are respectively with fourth connecting plate and second connecting plate rigid coupling, the third connecting plate has the connecting rod through the mounting panel rigid coupling, connecting rod and fixed block rigid coupling.
Further, still including the extrusion mechanism of adjusting first elastic component elasticity, the extruder constructs and sets up in the connection shell, extrusion mechanism is including the telescopic cylinder of symmetrical distribution, telescopic cylinder rigid coupling in the backup pad of symmetrical distribution, sliding column sliding connection has first backup pad, telescopic end and the first backup pad rigid coupling of telescopic cylinder, the lower extreme and the first backup pad rigid coupling of first elastic component, the inner wall rigid coupling of connection shell has symmetrical second fixed shell, second fixed shell sliding connection has the slip stopper, be provided with the fourth elastic component in the second fixed shell, the both ends and the adjacent second fixed shell of fourth elastic component and adjacent slip stopper rigid coupling, the intercommunication has oil pipe between second fixed shell and the adjacent telescopic cylinder, oil pipe and second fixed shell intussuseption are filled with hydraulic oil, the case is provided with the spacing subassembly that is used for prescribing a limit to the slip stopper position.
Further, the spacing subassembly is including the second backup pad that the symmetry distributes, and second backup pad rigid coupling in the case of symmetry distributes, and second backup pad sliding connection has the spline pole, and the lower part rigid coupling of spline pole has the limiting plate, and the spline pole cover is equipped with the fifth elastic component, and the both ends of fifth elastic component respectively with adjacent second backup pad and adjacent limiting plate rigid coupling, the lower extreme rigid coupling of spline pole has the stopper, and the stopper is used for spacing adjacent slip stopper.
Further, the lower part of the limiting block is provided with a groove for being tightly matched with the adjacent sliding plug.
In summary, the beneficial effects of the invention are as follows:
1. the annular diaphragm is deformed and extruded on the fixed block, the annular diaphragm and the fixed block are in resealing fit, the sealing effect between the valve core and the valve seat is improved, abrasion is prevented in the process of grouting slurry, gaps are generated between valve core valve seats, cement is caused to flow backward into the sleeve from the gaps between the valve core valve seats, meanwhile, the annular diaphragm is extruded on the inclined surface of the fixed block, the fixed block is extruded by the upward extrusion force, the fixed block drives the valve core to upwards extrude the valve seat, the sealing performance between the valve seat and the valve core is improved, the cementing quality is improved, and cement slurry is prevented from flowing backward into the sleeve again.
2. The protection shell moves downwards to protect the annular diaphragm, so that abrasion is avoided to the annular diaphragm in the process of downward flowing of cement slurry, the service life of the annular diaphragm is prolonged, the first connecting plate is matched with the protection shell, cement slurry is prevented from entering between the valve seat and the first connecting plate, the second connecting plate is matched with the first fixed shell, the cement slurry is prevented from entering between the valve seat and the second connecting plate, the second connecting plate and the first connecting plate can be prevented from being influenced by the cement slurry, and the second connecting plate and the first connecting plate can be prevented from being rapidly moved to the appointed position.
3. The fourth connecting plate upwards promotes the third connecting plate through the slide bar, and the third connecting plate passes through the mounting panel and drives the connecting rod and upwards remove, and connecting rod upwards pulls fixed block and case, and then makes the inseparable extrusion of case on the disk seat, further improves the leakproofness of disk seat and case, has prevented that first elastic component from inefficacy leading to disk seat and case to seal incompletely.
4. The extrusion force of cement slurry in the connecting shell to both sides acts on the slip stopper, makes the pressure of the interior hydraulic oil of telescopic cylinder increase, and then the flexible end of telescopic cylinder drives first backup pad upward movement, and first backup pad makes first elastic component further compress along the slip post upward movement, has improved the elasticity of first elastic component, prevents that first elastic component from inefficacy under high temperature environment from leading to elasticity to reduce.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a schematic cross-sectional perspective view of the connection housing of the present invention.
FIG. 3 is a schematic perspective view of a valve seat and other parts of the present invention in cross-section.
Fig. 4 is an enlarged perspective view of fig. 3 a according to the present invention.
Fig. 5 is a schematic perspective view of the pressure failure prevention mechanism of the present invention.
Fig. 6 is a schematic perspective view of the extrusion mechanism of the present invention.
Fig. 7 is a schematic perspective view of a limiting assembly according to the present invention.
In the reference numerals: 101-connection shell, 102-valve seat, 103-support plate, 104-sliding column, 105-valve core, 1051-first elastic piece, 106-annular groove, 107-annular diaphragm, 108-cylindrical cavity, 109-sliding tube, 110-piston plate, 111-second elastic piece, 112-first connection plate, 113-protective shell, 114-second connection plate, 115-first fixed shell, 116-fixed block, 201-sliding rod, 202-third connection plate, 203-fourth connection plate, 204-third elastic piece, 205-connection rod, 301-telescopic cylinder, 302-first support plate, 303-second fixed shell, 304-sliding plug, 305-fourth elastic piece, 306-oil guide tube, 307-second support plate, 308-spline rod, 309-limit plate, 310-fifth elastic piece, 311-limit block.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
Example 1: 1-4, a float collar float shoe with anti-backflow function for well cementation construction comprises a connecting shell 101, wherein the inner wall of the connecting shell 101 is fixedly connected with a valve seat 102, the middle part of the valve seat 102 is provided with a circular through hole, cement paste flows downwards through the circular through hole of the valve seat 102, the inner wall of the connecting shell 101 is fixedly connected with a supporting plate 103, the supporting plate 103 is positioned below the valve seat 102, the supporting plate 103 is slidably connected with a sliding column 104, the sliding column 104 is fixedly connected with a valve core 105 which is in sealing fit with the valve seat 102, the valve core 105 is used for sealing the circular through hole of the valve seat 102, after the valve core 105 is extruded by cement paste, the sliding column 104 slides downwards along the supporting plate 103, the sliding column 104 is sleeved with a first elastic piece 1051, the first elastic piece 1051 is arranged as a spring, two ends of the first elastic piece 1051 are in extrusion contact with the supporting plate 103 and the valve core 105, and the elasticity of the first elastic piece 1051 is utilized, when the cement paste injection is stopped, the valve core 105 moves upwards to be contacted with the valve seat 102 again, the cement paste is prevented from flowing backwards into the sleeve, the annular groove 106 is arranged on the inner ring surface of the valve seat 102, the annular groove 106 of the valve seat 102 is fixedly connected with the annular diaphragm 107, the annular diaphragm 107 is deformed after being extruded, the annular diaphragm 107 and the valve seat 102 are matched at the annular groove 106 to form an annular cavity, the annular cavity of the annular diaphragm 107 is filled with hydraulic oil, the state of the annular diaphragm 107 is changed by changing the pressure of the hydraulic oil in the annular cavity of the annular groove 106 and the annular diaphragm 107, the upper side of the valve core 105 is fixedly connected with the fixed block 116, the fixed block 116 is arranged in a frustum shape and is used for changing the extrusion direction of the annular diaphragm 107 to the fixed block 116, when the annular diaphragm 107 is extruded on the inclined surface of the fixed block 116, the annular diaphragm 107 enables the fixed block 116 to be subjected to upward extrusion force, the annular diaphragm 107 is matched with the fixed block 116 in an extrusion mode, the annular diaphragm 107 is made of polyurethane elastic materials and used for improving tightness between the annular diaphragm 107 and the fixed block 116, the valve seat 102 is provided with a pressure sealing assembly, the pressure sealing assembly adjusts pressure of hydraulic oil in the annular cavity of the annular groove 106 and the annular diaphragm 107 according to pressure of cement paste on the upper side and the lower side of the valve seat 102, and the valve seat 102 is provided with a protection assembly used for protecting the annular diaphragm 107.
As shown in fig. 3 and 4, the pressure sealing assembly comprises four sliding pipes 109 distributed at equal intervals in the circumferential direction, the four sliding pipes 109 distributed at equal intervals in the circumferential direction are connected to the valve seat 102 in a penetrating and sliding manner, the four sliding pipes 109 are in sealing fit with the valve seat 102, the valve seat 102 is provided with four cylindrical cavities 108 at equal intervals in the circumferential direction, the sliding pipes 109 penetrate through the adjacent cylindrical cavities 108, the cylindrical cavities 108 are communicated with the annular grooves 106, the sliding pipes 109 are fixedly connected with piston plates 110, after the sliding pipes 109 are subjected to the extrusion force of cement paste, the sliding pipes 109 drive the piston plates 110 on the sliding pipes to move downwards along the cylindrical cavities 108, the piston plates 110 are connected in the adjacent cylindrical cavities 108 in a sliding manner, the piston plates 110 move up and down, the pressure of hydraulic oil in the annular cavities of the annular grooves 106 and the annular diaphragms 107 is changed, second elastic pieces 111 are arranged in the cylindrical cavities 108, two ends of the second elastic piece 111 are fixedly connected with the adjacent piston plate 110 and the valve seat 102 respectively, the second elastic piece 111 is sleeved on the adjacent sliding pipes 109, the upper ends of the four sliding pipes 109 are fixedly connected with the first connecting plates 112, when cement slurry starts to be injected, the first connecting plates 112 are subjected to the extrusion force of the cement slurry to move downwards, the lower ends of the four sliding pipes 109 are fixedly connected with the second connecting plates 114, when the cement slurry stops being injected, the cement slurry at the lower side of the valve seat 102 can upwards extrude the second connecting plates 114 to enable the second connecting plates 114 to move upwards, the first connecting plates 112 and the second connecting plates 114 are both connected with the connecting shell 101 in a sliding way, sealing rings are arranged on the outer annular surfaces of the first connecting plates 112 and the second connecting plates 114 and the connecting shell 101 to improve the tightness of the first connecting plates 112 and the second connecting plates 114 and the valve seat 102 and prevent the cement slurry from flowing into the space between the first connecting plates 112 and the second connecting plates 114 and the valve seat 102, resulting in the first connection plate 112 and the second connection plate 114 not being completely restored.
As shown in fig. 3, the protection assembly comprises a protection shell 113, the protection shell 113 is slidably connected to the valve seat 102, the upper end of the protection shell 113 is fixedly connected with a first connecting plate 112, the protection shell 113 moves downwards along the valve seat 102, so that the protection shell 113 protects the annular diaphragm 107, abrasion to the annular diaphragm 107 in the process of downwards flowing cement slurry is avoided, the service life of the annular diaphragm 107 is prolonged, a first fixing shell 115 is fixedly connected to the lower side of the valve seat 102, and a second connecting plate 114 is slidably connected with the first fixing shell 115 and is in sealing fit with the first fixing shell 115.
When the cement slurry is injected into the sleeve by a worker, the cement slurry flows downwards and presses the valve core 105 downwards, the valve core 105 drives the sliding column 104 to move downwards along the supporting plate 103, the first elastic piece 1051 is compressed, the valve core 105 is pressed and then moves downwards to lose contact with the valve seat 102, the sealing of the valve seat 102 is released, in the process, the cement slurry simultaneously presses the first connecting plate 112 downwards, the first connecting plate 112 drives the four sliding pipes 109 to move downwards, the sliding pipes 109 drive the piston plate 110 on the sliding pipes to move downwards, the four sliding pipes 109 drive the second connecting plate 114 to synchronously move downwards, hydraulic oil between the annular groove 106 and the annular diaphragm 107 is pumped into the four cylindrical cavities 108 in the process of moving the piston plate 110 downwards, the annular diaphragm 107 deforms and is recessed inwards in the annular groove 106 due to the pressure reduction of the hydraulic oil in the annular groove 106, the annular diaphragm 107 is released from pressing the fixed block 116 at the moment, and then the cement slurry flows downwards through the valve seat 102 until the lower end of the connecting shell 101 flows out, and grouting between the oil well and the sleeve is completed.
In the process that second connecting plate 114 and first connecting plate 112 move downwards, first connecting plate 112 drives protection shell 113 to move downwards, protection shell 113 moves downwards along the inside of disk seat 102, protection shell 113 moves downwards and protects annular diaphragm 107, avoid causing wearing and tearing to annular diaphragm 107 at the in-process that grout flows downwards, the life of annular diaphragm 107 has been improved, first connecting plate 112 cooperates with protection shell 113 simultaneously, prevent that grout from entering into between disk seat 102 and the first connecting plate 112, second connecting plate 114 cooperates with first fixed shell 115 simultaneously, prevent that grout from entering into disk seat 102 and second connecting plate 114, and then can guarantee that second connecting plate 114 and first connecting plate 112 do not receive the influence of grout, the quick travel arrives the assigned position.
After grouting is finished, a worker stops injecting cement paste into the sleeve, the pressure of the cement paste is reduced, under the action of the elastic force of the first elastic piece 1051, the valve core 105 and the sliding column 104 move upwards to reset, the valve core 105 is used for plugging the valve seat 102 again, when the valve core 105 and the sliding column 104 move upwards, the second connecting plate 114 receives the pressure of cement paste at the lower part of the valve seat 102, the second connecting plate 114 drives the four sliding pipes 109 to move upwards, the four sliding pipes 109 drive the first connecting plate 112 to synchronously move upwards, the four sliding pipes 109 respectively drive the piston plates 110 on the four sliding pipes to move upwards along the adjacent cylindrical cavities 108 until the four sliding pipes 109 reset, the first connecting plate 112 drives the protective shell 113 to move upwards in the process of moving upwards, the protective shell 113 is used for sealing the annular diaphragm 107, simultaneously, the second elastic piece 111 resets, further hydraulic oil in the four cylindrical cavities 108 flows back into the annular groove 106 again, the annular diaphragm 107 deforms and is extruded on the fixed block 116, the annular diaphragm 107 is matched with the fixed block 116 again in a sealing mode, the sealing effect between the annular diaphragm 105 and the valve seat 102 is improved, the cement paste is prevented from being extruded between the valve core 105 and the valve seat 102, and the cement paste is prevented from being extruded between the valve core 105 and the valve seat 102.
Example 2: on the basis of embodiment 1, as shown in fig. 5, the device further comprises a pressure failure prevention mechanism for preventing the first elastic piece 1051 from failing, the pressure failure prevention mechanism is arranged on the valve seat 102, the pressure failure prevention mechanism comprises four sliding rods 201 distributed at equal intervals in the circumferential direction, the four sliding rods 201 distributed at equal intervals are respectively connected in adjacent sliding tubes 109 in a sliding mode, the sliding rods 201 penetrate through the first connecting plate 112 and the second connecting plate 114, the sliding rods 201 are in sliding fit with the first connecting plate 112 and the second connecting plate 114, a third connecting plate 202 is fixedly connected to the upper ends of the four sliding rods 201, the third connecting plate 202 is located on the upper side of the first connecting plate 112, when cement slurry injection begins, the third connecting plate 202 moves downwards synchronously with the first connecting plate 112, a fourth connecting plate 203 is fixedly connected with the lower end of the fourth connecting plate 203, the fourth connecting plate 203 is in sliding connection with the first fixing shell 115 and the connecting shell 101 and is in sealing fit, when cement slurry injection stops, the fourth connecting plate 203 is subjected to extrusion force of cement slurry, the third connecting plate 202 is extruded upwards through the four sliding rods 201, a third connecting plate 204 is sleeved on the lower part 204 of the sliding rods 201, a third elastic piece 204 is fixedly connected with the third connecting plate 205, two ends of the third connecting plate 205 are fixedly connected with the third connecting plate 116 and the valve seat 116 are fixedly connected with the third connecting plate 116, and the valve seat is fixedly connected with the third connecting plate 205.
When cement slurry is injected into the sleeve by a worker, the third connecting plate 202 synchronously moves downwards along with the first connecting plate 112, the third connecting plate 202 drives the fourth connecting plate 203 to synchronously move downwards through the four sliding rods 201, at the moment, the third connecting plate 202 drives the connecting rod 205 to move downwards through the mounting plate, when cement slurry is stopped to be injected, the valve core 105 and other parts on the valve core 105 move upwards to reset, meanwhile, the fourth connecting plate 203 is subjected to the extrusion force of the cement slurry to move upwards, the fourth connecting plate 203 drives the second connecting plate 114 to synchronously move upwards through the third elastic piece 204 until the second connecting plate 114 is contacted with the valve seat 102, the pressure of the cement slurry at the lower part of the valve seat 102 continuously acts on the lower side of the fourth connecting plate 203, the cement slurry upwards extrudes the fourth connecting plate 203, the fourth connecting plate 203 upwards pushes the third connecting plate 202 through the four sliding rods 201, the connecting rod 205 drives the connecting rod 205 to upwards move the fixing block 116 and the valve core 105 through the mounting plate, the valve core 105 is tightly extruded on the valve seat 102, the sealing performance of the valve seat 102 and the valve core 105 is further improved, and the sealing performance of the valve seat 102 and the valve core 105 is prevented from being incompletely failed due to the failure of the first elastic piece 1051.
Example 3: based on embodiment 2, as shown in fig. 6 and 7, the hydraulic oil pump further comprises an extrusion mechanism for adjusting the elasticity of the first elastic piece 1051, the extrusion mechanism is arranged on the connecting shell 101, the extrusion mechanism comprises two symmetrical telescopic cylinders 301, the two symmetrical telescopic cylinders 301 are fixedly connected with the supporting plate 103, the sliding column 104 is slidably connected with the first supporting plate 302, the telescopic ends of the telescopic cylinders 301 are fixedly connected with the first supporting plate 302, the lower ends of the first elastic piece 1051 are fixedly connected with the first supporting plate 302, the telescopic ends of the two telescopic cylinders 301 drive the first supporting plate 302 to move upwards when moving upwards, the first elastic piece 1051 is further compressed, the elasticity of the first elastic piece 1051 is improved, the inner wall of the connecting shell 101 is fixedly connected with two symmetrical second fixed shells 303, the second fixed shells 303 are slidably connected with sliding plugs 304, fourth elastic pieces 305 are arranged in the second fixed shells 303, two ends of the fourth elastic pieces 305 are fixedly connected with the adjacent second fixed shells 303 and the adjacent sliding plugs 304, after cement paste 304 is stopped, the extrusion plugs 304 in the connecting shell 101 act on the two sides of the two adjacent sliding plugs 306 to the second fixed shells 306, and the hydraulic oil guide plugs 306 are fixedly connected with the adjacent oil guide shells, and the hydraulic oil guide shells are fixedly connected with the adjacent sliding shells 303, and the hydraulic oil guide plugs are fixedly arranged between the two sliding shells and the adjacent oil guide shells are used for sliding along the second fixed shells 303, and the adjacent sliding plug guide shells are fixedly connected with the sliding plug 303, and the sliding plug rods are arranged.
As shown in fig. 7, the limiting component comprises two second supporting plates 307 which are symmetrically distributed, the two second supporting plates 307 which are symmetrically distributed are fixedly connected to the valve core 105, the second supporting plates 307 move downwards synchronously with the valve core 105 in the opening process of the valve core 105, spline rods 308 are slidably connected to the second supporting plates 307, limiting plates 309 are fixedly connected to the lower portions of the spline rods 308, fifth elastic pieces 310 are sleeved on the spline rods 308, two ends of each fifth elastic piece 310 are fixedly connected with the adjacent second supporting plates 307 and the adjacent limiting plates 309 respectively, limiting blocks 311 are fixedly connected to the lower ends of the spline rods 308, limiting blocks 311 limit the adjacent sliding plugs 304, the sliding plugs 304 are not compressed in the grouting process, the limiting blocks 311 are used for limiting the adjacent sliding plugs 304, and grooves are formed in the lower portions of the limiting blocks 311 and are used for tightly matching with the adjacent sliding plugs 304.
When cement slurry is injected into the sleeve, the valve core 105 drives the second support plates 307 on two sides to move downwards, the second support plates 307 drive the spline rods 308 on the second support plates 307 to move downwards, and then the limiting blocks 311 press the adjacent sliding plugs 304, in the process, the pressure of the cement slurry does not act on the sliding plugs 304, along with the downward movement of the valve core 105, the second support plates 307 move downwards along the adjacent spline rods 308 and press the adjacent fifth elastic pieces 310, after the valve seat 102 and the valve core 105 are completely out of engagement, the pressure of the cement slurry acts on the two sliding plugs 304, but under the limiting effect of the limiting blocks 311, the sliding plugs 304 cannot move along the adjacent second fixed shells 303, when the cement slurry is stopped being injected into the sleeve, the valve core 105 drives the second support plates 307 on two sides to move upwards to reset, the limiting blocks 311 immediately contact and limit the adjacent sliding plugs 304, then the extrusion force of cement slurry in the connecting shell 101 to two sides acts on the two sliding plugs 304, so that the sliding plugs 304 slide along the adjacent second fixed shells 303, the two fourth elastic pieces 305 are compressed, hydraulic oil in the two second fixed shells 303 respectively flows into the adjacent telescopic cylinders 301 along the adjacent oil guide pipes 306, the pressure of the hydraulic oil in the telescopic cylinders 301 is increased, the telescopic ends of the telescopic cylinders 301 move upwards under the pushing of the hydraulic oil, the telescopic ends of the two telescopic cylinders 301 drive the first supporting plates 302 to move upwards, the first supporting plates 302 move upwards along the sliding columns 104, the first elastic pieces 1051 are further compressed, the elastic force of the first elastic pieces 1051 is improved, and the first elastic pieces 1051 are prevented from being invalid under a high-temperature environment to cause the elastic force to be reduced.
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 (9)
1. The floating collar floating shoe with the backflow prevention function for well cementation construction comprises a connecting shell (101), wherein a valve seat (102) is fixedly connected to the inner wall of the connecting shell (101), and is characterized in that a supporting plate (103) is fixedly connected to the inner wall of the connecting shell (101), the supporting plate (103) is positioned below the valve seat (102), a sliding column (104) is slidably connected to the supporting plate (103), a valve core (105) in sealing fit with the valve seat (102) is fixedly connected to the sliding column (104), a first elastic piece (1051) is sleeved on the sliding column (104), two ends of the first elastic piece (1051) are in extrusion contact with the supporting plate (103) and the valve core (105), an annular groove (106) is formed in the inner annular surface of the valve seat (102), an annular groove (106) is fixedly connected with an annular diaphragm (107) in sealing connection with the annular groove (106), an annular diaphragm (107) and the valve seat (102) are matched with each other to form an annular cavity, a fixed block (116) is fixedly connected to the upper side of the valve core (105), the annular diaphragm (107) is matched with the fixed block (103) in a sealing mode, cement paste is extruded on two sides of the valve seat (102) in a sealing mode, regulating the pressure of hydraulic oil in the annular cavity of the annular groove (106) and the annular diaphragm (107);
the pressure seal assembly comprises sliding pipes (109) distributed at equal intervals in the circumferential direction, the sliding pipes (109) distributed at equal intervals in the circumferential direction are connected with the valve seat (102) in a penetrating mode, the valve seat (102) is provided with cylindrical cavities (108) distributed at equal intervals in the circumferential direction, the sliding pipes (109) penetrate through adjacent cylindrical cavities (108), the cylindrical cavities (108) are communicated with the annular grooves (106), piston plates (110) are fixedly connected with the sliding pipes (109), the piston plates (110) are connected in the adjacent cylindrical cavities (108) in a sliding mode, second elastic pieces (111) are arranged in the cylindrical cavities (108) in a sliding mode, the second elastic pieces (111) are sleeved on the adjacent sliding pipes (109), two ends of each second elastic piece (111) are fixedly connected with the adjacent piston plates (110) and the valve seat (102) respectively, first connecting plates (112) are fixedly connected with the upper ends of the sliding pipes (109) distributed at equal intervals in the circumferential direction, and second connecting plates (114) are fixedly connected with the lower ends of the sliding pipes (109) distributed at equal intervals in the circumferential direction.
2. A float collar float shoe with anti-backflow function for well cementation construction as claimed in claim 1, wherein the annular diaphragm (107) is made of polyurethane elastic material for increasing the tightness between the annular diaphragm and the fixed block (116).
3. A float collar float shoe with anti-backflow function for well cementation construction as claimed in claim 1, wherein the fixed block (116) is arranged in a frustum shape for changing the extrusion direction of the annular diaphragm (107) to the fixed block (116).
4. A float collar float shoe with anti-backflow function for well cementation construction as claimed in claim 3, wherein the outer annular surfaces of the first connecting plate (112) and the second connecting plate (114) are provided with sealing rings for improving the tightness between the first connecting plate (112) and the second connecting plate (114) and the connecting shell (101).
5. A float collar float shoe with anti-backflow function for well cementation construction as claimed in claim 3, characterized in that the valve seat (102) is provided with a protection component for protecting the annular diaphragm (107), the protection component comprises a protection shell (113), the protection shell (113) is slidably connected with the valve seat (102), the upper end of the protection shell (113) is fixedly connected with the first connecting plate (112), the lower side of the valve seat (102) is fixedly connected with the first fixing shell (115), and the second connecting plate (114) is slidably connected with the first fixing shell (115) and is in sealing fit.
6. The floating shoe with the backflow prevention function for well cementation construction according to claim 5, further comprising a pressure failure prevention mechanism for preventing the first elastic piece (1051) from being failed, wherein the pressure failure prevention mechanism is arranged on the valve seat (102), the pressure failure prevention mechanism comprises sliding rods (201) distributed at equal intervals in the circumferential direction, the sliding rods (201) distributed at equal intervals are respectively and slidably connected in adjacent sliding tubes (109), the sliding rods (201) penetrate through the first connecting plate (112) and the second connecting plate (114), the sliding rods (201) are in sliding fit with the first connecting plate (112) and the second connecting plate (114), a third connecting plate (202) is fixedly connected to the upper ends of the sliding rods (201) distributed at equal intervals in the circumferential direction, a fourth connecting plate (203) is fixedly connected to the lower ends of the sliding rods (201) distributed at equal intervals in the circumferential direction, the fourth connecting plate (203) is in sliding connection with the first fixing shell (115) and the connecting shell (101) in sealing fit, third elastic pieces (204) are sleeved on the lower parts of the sliding rods (201), and two ends of each third elastic piece (204) are fixedly connected with the third connecting plate (202) and the third connecting plate (116) respectively.
7. The floating collar shoes with the backflow prevention function for well cementation construction according to claim 1, further comprising an extrusion mechanism for adjusting the elasticity of the first elastic piece (1051), wherein the extrusion mechanism is arranged on the connecting shell (101), the extrusion mechanism comprises symmetrically distributed telescopic cylinders (301), the symmetrically distributed telescopic cylinders (301) are fixedly connected with the supporting plate (103), the sliding columns (104) are slidably connected with the first supporting plate (302), the telescopic ends of the telescopic cylinders (301) are fixedly connected with the first supporting plate (302), the lower ends of the first elastic pieces (1051) are fixedly connected with the first supporting plate (302), the inner wall rigid coupling of connection shell (101) has symmetrical second fixed shell (303), second fixed shell (303) sliding connection has slip stopper (304), be provided with fourth elastic component (305) in second fixed shell (303), the both ends and adjacent second fixed shell (303) of fourth elastic component (305) and adjacent slip stopper (304) rigid coupling, the intercommunication has oil pipe (306) between second fixed shell (303) and the adjacent telescopic cylinder (301), oil pipe (306) and second fixed shell (303) intussuseption are filled with hydraulic oil, case (105) are provided with the spacing subassembly that is used for prescribing a limit to slip stopper (304) position.
8. The float collar float shoe with anti-backflow function for well cementation construction according to claim 7, wherein the limiting component comprises a second supporting plate (307) which is symmetrically distributed, the second supporting plate (307) which is symmetrically distributed is fixedly connected with the valve core (105), the second supporting plate (307) is slidably connected with a spline rod (308), a limiting plate (309) is fixedly connected to the lower portion of the spline rod (308), a fifth elastic piece (310) is sleeved on the spline rod (308), two ends of the fifth elastic piece (310) are fixedly connected with the adjacent second supporting plate (307) and the adjacent limiting plate (309) respectively, a limiting block (311) is fixedly connected to the lower end of the spline rod (308), and the limiting block (311) is used for limiting the adjacent sliding plug (304).
9. A float collar and float shoe with anti-backflow function for well cementation construction as claimed in claim 8, wherein the lower part of the limiting block (311) is provided with a groove for being tightly matched with the adjacent sliding plug (304).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310777309.0A CN116498258B (en) | 2023-06-29 | 2023-06-29 | Floating collar floating shoe with backflow preventing function for well cementation construction |
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| CN202310777309.0A CN116498258B (en) | 2023-06-29 | 2023-06-29 | Floating collar floating shoe with backflow preventing function for well cementation construction |
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| CN116498258B true CN116498258B (en) | 2023-08-22 |
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| CN117005827B (en) * | 2023-09-26 | 2023-12-19 | 河北漫浩科技有限责任公司 | Cementing rubber plug capable of preventing cement paste from flowing upwards and flowing backwards |
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| SU1490255A1 (en) * | 1987-09-01 | 1989-06-30 | Всесоюзный научно-исследовательский институт по креплению скважин и буровым растворам | Arrangement for reverse cementing of casings |
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| CN115306348A (en) * | 2022-10-12 | 2022-11-08 | 东营市源鑫石油科技有限公司 | Self-filling type float collar float shoe for well cementation |
| CN115538973A (en) * | 2022-09-22 | 2022-12-30 | 李雪佳 | Float collar float shoe for well cementation construction |
| CN115977581A (en) * | 2023-03-20 | 2023-04-18 | 山东健源石油工程技术有限公司 | Automatic grouting floating shoe device for oil well construction and pouring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| SU1490255A1 (en) * | 1987-09-01 | 1989-06-30 | Всесоюзный научно-исследовательский институт по креплению скважин и буровым растворам | Arrangement for reverse cementing of casings |
| CN205225175U (en) * | 2015-11-20 | 2016-05-11 | 中国石油天然气股份有限公司 | Float collar device |
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