CN110821439B - Coiled tubing dynamic seal device - Google Patents
Coiled tubing dynamic seal device Download PDFInfo
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- CN110821439B CN110821439B CN201911189958.9A CN201911189958A CN110821439B CN 110821439 B CN110821439 B CN 110821439B CN 201911189958 A CN201911189958 A CN 201911189958A CN 110821439 B CN110821439 B CN 110821439B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/10—Wear protectors; Centralising devices, e.g. stabilisers
- E21B17/1078—Stabilisers or centralisers for casing, tubing or drill pipes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/02—Scrapers specially adapted therefor
Abstract
The invention provides a coiled tubing dynamic sealing device, which adopts the technical scheme that: the lower sealing oil scraping structure is connected with the upper righting structure through a limiting supporting plate and a connecting bolt, an inner cavity of the limiting supporting plate is a sealing cylinder, a sealing base sleeve, a sealing rubber core and an easily replaced rubber pad are added into an inner cavity of the sealing cylinder, the sealing rubber core is installed in the inner cavity of the sealing base sleeve, the limiting supporting plate is opened or closed, and the sealing base sleeve, the sealing rubber core or the easily replaced rubber pad in the inner cavity of the sealing cylinder are replaced. The beneficial effects are that: by adding a plurality of groups of positioning and centering steel balls, the effects of centering and reducing friction on the coiled tubing are achieved; through installing the sealing base sleeve, the sealing rubber core and the easily-replaced rubber pad that can be changed in a split manner in the sealing cylinder, not only can the dynamic seal of the continuous oil pipe be realized, but also the corresponding sealing element can be conveniently replaced, and the oil scraping device is additionally arranged, so that the dynamic seal effect is improved, the service life of the continuous oil pipe is prolonged, and the leakage accident of a well head is avoided.
Description
Technical Field
The invention relates to a device for the petroleum industry, in particular to a dynamic sealing device for a coiled tubing.
Background
The coiled tubing is a tubing made of low-carbon alloy steel, has good flexibility, is also called as flexible tubing, is wound on a roller, adopts special injection equipment, can be continuously put into a well or be taken out from the well, is a whole piece of long tubing without threaded connection, can solve the problem which can not be solved by the conventional operation mode, can be applied to the fields of well repair, well completion, well logging, pipeline gathering and transportation and the like, and has the main advantages that:
1. the operation efficiency is improved, and the well repairing time is shortened by more than 2/3 due to the fact that the number of coiled tubing equipment is small and the tripping speed is high;
2. the operation cost is reduced, the coiled tubing is used for drilling and repairing the well, the workload is small, the number of users is greatly reduced, and the cost is reduced by more than 30% compared with the cost of the traditional operation mode;
3. the safety operation is improved, the coiled tubing can be safely operated, the continuous operation can be carried out under pressure, and the stratum is prevented from being damaged by killing the well.
4. The environment-friendly operation is realized, the occupied area of the coiled tubing operation field is small, an oil-gas layer is protected, the blowout prevention operation under pressure can be avoided, the formation pollution is prevented, and the environment is protected.
5. The labor intensity is reduced, the equipment operation is centralized and convenient, the automation degree is high, and the operation workers can be relieved from heavy physical labor.
In addition, the coiled tubing mainly comprises an injector, a hydraulic station, a coil device, a control room, a wellhead blowout preventer stack and the like, wherein the wellhead blowout preventer stack comprises a four-gate blowout preventer and a coiled tubing dynamic sealer, the four-gate blowout preventer sequentially comprises a full sealer, a pipe cutter, a half sealer and a hanger from top to bottom, and the coiled tubing dynamic sealer is arranged on the upper part of the four-gate blowout preventer. For example, chinese patent publication No. 105064934a, entitled "a coiled tubing device capable of being remotely lifted and lowered" and an operation method thereof, is a coiled tubing four-ram blowout preventer and a coiled tubing dynamic seal blowout preventer suspended below an injector support and installed above an injection wellhead, a coiled tubing driving mechanism and a coiled tubing clamping mechanism connected to the injector support through a weighing sensor, coiled tubing wound on a coiled tubing drum, and passed through an injector gooseneck and lowered into a well through the injector and the blowout preventer. When the coiled tubing is operated, the coiled tubing four-ram blowout preventer only plays a connecting role at the moment, does not play a sealing and blowout preventing role, but realizes the dynamic sealing of the coiled tubing through the coiled tubing dynamic sealer, and after the operation is finished, the coiled tubing dynamic sealer, an injector bracket, a coil pipe device and the like are all taken away, the coiled tubing four-ram blowout preventer is reserved to seal an oil well, so that the blowout preventing function is played, and the coiled tubing four-ram blowout preventer belongs to a blowout preventing device in a static state.
The Chinese patent publication No. 201915888U, coiled tubing wellhead suspension sealing device, is applied to oil extraction wellheads of oil fields. The upper flange and the lower flange are oppositely connected together through nuts and bolts, a pipe joint is welded on the lower end face of the lower flange, external threads are arranged at the lower end of the pipe joint, a cylindrical shell is welded on the upper end face of the upper flange, a shell center hole is divided into a cylindrical lower cavity and a cylindrical upper cavity through an inner step, the cylindrical lower cavity is communicated with the cylindrical upper cavity through a center hole, a slip hanger is fixed in the lower cavity of the shell, an upper gasket, a sealing ring and a lower gasket are fixed in the upper cavity of the shell, the upper gasket, the sealing ring and the lower gasket are annular, internal threads are arranged at the end part of the upper cavity of the shell, and a compression nut is fixed at the upper end of the shell through threads. The coiled tubing hanging and sealing device has the advantages that the coiled tubing hanging and sealing device is installed at a wellhead, coiled tubing is put into a well, the coiled tubing hanging and sealing device can be hung at the wellhead and can play a role in sealing the coiled tubing, and the coiled tubing hanging and sealing device is compact in structure, reliable in hanging and reliable in sealing. The utility model discloses a blowout preventer when still is applied to the coiled tubing operation and accomplishes the back also, belongs to quiescent condition. Therefore, the technology also does not disclose a dynamic sealing device and method for coiled tubing injection or lifting.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the coiled tubing dynamic sealing device which not only can realize the dynamic sealing of the coiled tubing, but also is convenient to replace the corresponding sealing element, the whole sealing element is not required to be replaced every time, and the centering mechanism and the oil scraping device are added, so that the dynamic sealing effect is improved, the service life of the coiled tubing is prolonged, and the leakage accident of a wellhead is avoided.
The invention provides a coiled tubing dynamic sealing device, which adopts the technical scheme that: comprises a lower joint (1), a seat seal piston (2), a split ring oil scraper (3), oil swelling rubber (4) meeting, a seat seal hydraulic cylinder (5), a rubber press ring (6), a righting steel ball (7), an easy-to-replace rubber pad (8), a seal base sleeve (9), a seal rubber core (10), a positioning righting steel ball (11), a connecting bolt (12), a rubber replacing hydraulic cylinder (13), a seal cylinder (14), a rubber seat seal base ring (15), a hollow core shaft (16) and a limit support plate (18), wherein the split ring oil scraper (3) is arranged at an inner cavity boss of the lower joint (1), the upper part of the lower joint (1) is movably connected with the seat seal hydraulic cylinder (5), the seat seal piston (2) is arranged in an inner cavity of the seat seal hydraulic cylinder (5), the oil swelling rubber (4) meeting is arranged in an inner cavity of the seat seal piston (2), and the rubber press ring (6) is arranged at the top of the seat seal piston (2), forming a lower sealing oil scraping structure;
the rubber replacement hydraulic cylinder (13) is connected with the sealing cylinder (14), the hollow mandrel (16) is installed at the upper end of the sealing cylinder (14), the rubber base seal ring (15) penetrates into the inner cavity of the hollow mandrel (16) upwards along the bottom of the hollow mandrel (16), the outer wall of the upper portion of the hollow mandrel (16) is movably connected with the inner wall of the upper end of the rubber replacement hydraulic cylinder (13), and a plurality of groups of positioning and centering steel balls (11) are installed on the inner wall of the rubber base seal ring (15) to form an upper centering structure;
the lower sealing oil scraping structure is connected with the upper righting structure through a limiting support plate (18) and a connecting bolt (12), and the limiting support plate (18) is used for limiting the distance between the seat sealing hydraulic cylinder (5) and the rubber replacement hydraulic cylinder (13) and is fixedly connected with the seat sealing hydraulic cylinder through the connecting bolt (12); the inner cavity of the limiting support plate (18) is a sealing cylinder (14), a sealing base sleeve (9), a sealing rubber core (10) and an easily-replaceable rubber pad (8) are added in the inner cavity of the sealing cylinder (14), the sealing rubber core (10) is arranged in the inner cavity of the sealing base sleeve (9), and the easily-replaceable rubber pads (8) are respectively arranged at the upper end and the lower end of the sealing rubber core (10); the limit supporting plate (18) is opened or closed by controlling the up-and-down movement of the sealing cylinder (14), and the sealing base sleeve (9), the sealing rubber core (10) or the easily replaced rubber pad (8) in the inner cavity of the sealing cylinder (14) are replaced.
Preferably, the limit support plate (18) has an arc-shaped structure, and the limit support plate (18) covers the outer side of the sealing cylinder (14).
Preferably, the inner wall of the rubber replacement hydraulic cylinder (13) is provided with a first through hole (13.1) and a second through hole (13.2), a cavity formed between the inner wall of the rubber replacement hydraulic cylinder (13) and the outer wall of the hollow mandrel (16) is used for enabling the sealing cylinder (14) to move up and down, the telescopic cavity is communicated with the outside through the first through hole (13.1) in the inner wall of the rubber replacement hydraulic cylinder (13), and when pressure is injected from the outside, the sealing cylinder (14) moves down; the lower edge of the top protrusion of the sealing cylinder (14) is communicated with the outside through the second through hole (13.2), and when pressure is injected from the outside, the pressure pushes the lower edge of the top protrusion of the sealing cylinder (14) from bottom to top to push the sealing cylinder (14) to move upwards.
Preferably, the split ring oil wiper (3) is in a bell mouth shape, the outer wall of the lower joint (1) is provided with an oil injection and blow-off hole (17), and the oil injection and blow-off hole (17) is arranged at the lower side of the split ring oil wiper (3).
Preferably, the seat seal piston (2) is of a cylindrical structure, a piston bulge is arranged in the middle of the outer wall and is in contact with the top of the lower joint (1) through the piston bulge, and the outer wall of the piston bulge is movably connected with the inner wall of the seat seal hydraulic cylinder (5).
Preferably, the rubber pressing ring (6) is made of brass, the lower part of the rubber pressing ring (6) is pressed on the seat sealing piston (2), and the upper part of the rubber pressing ring is contacted with the easy-changing rubber pad (8); the rubber compression ring (6) is radially provided with a plurality of centering steel balls (7), and each centering steel ball (7) is arranged in the rubber compression ring (6) through a spring steel ball support (19).
The invention has the beneficial effects that: by adding a plurality of groups of positioning and centering steel balls, the coiled tubing can be centered and friction can be reduced under the action of the positioning and centering steel balls when moving, and sliding friction is replaced by rolling friction; the lower part of the rubber seat seal base ring and the upper part of the rubber compression ring are respectively provided with a centering steel ball and a spring steel ball support, so that the coiled tubing can be always in a centered state when moving;
the lower sealing oil scraping structure is connected with the upper righting structure through the limiting support plate and the connecting bolt, and the sealing base sleeve, the sealing rubber core and the easily replaced rubber pad are arranged in the sealing cylinder, so that sealing can be completed only by replacing the easily replaced rubber pad when slight sealing is not firm; when further sealing is not firm, the sealing rubber core can be replaced to complete sealing; if the sealing element can not be sealed, the sealing base sleeve, the sealing rubber core and the rubber pad which is easy to replace can be replaced, in a word, the sealing element can be replaced respectively, compared with the prior art, the time for replacing the sealing element is saved, the waste situation of the sealing element is reduced, and the working efficiency is improved;
in addition, the rubber which expands when being exposed to oil is arranged, so that the hanging effect of the crude oil can be improved when the coiled tubing is lifted, and the hanging effect of the crude oil can be improved by arranging the split ring oil scraper in the shape of a bell mouth at the bottom.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the seal base;
FIG. 3 is a schematic structural view of the split ring oil wiper;
FIG. 4 is a schematic view of a partial structure of a rubber seal ring;
FIG. 5 is a schematic structural view of embodiment 3 of the present invention;
in the upper diagram: the oil seal structure comprises a lower joint 1, a seat seal piston 2, a split ring oil scraper 3, oil swelling rubber 4, a seat seal hydraulic cylinder 5, a rubber compression ring 6, a centering steel ball 7, an easily replaced rubber pad 8, a seal base sleeve 9, a seal rubber core 10, a positioning centering steel ball 11, a connecting bolt 12, a rubber replacement hydraulic cylinder 13, a seal cylinder 14, a rubber seat seal base ring 15, a hollow core shaft 16, a sewage injection hole 17, a limit support plate 18, a spring steel ball support 19, a thread guard 20, a first through hole 13.1 and a second through hole 13.2, a wedge-shaped cavity 9.1 and a cylindrical hole 15.1.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
the rubber replacement hydraulic cylinder 13 is connected with the sealing cylinder 14, the hollow mandrel 16 is installed at the upper end of the sealing cylinder 14, the rubber base seal ring 15 penetrates into the inner cavity of the hollow mandrel 16 along the bottom of the hollow mandrel 16, the outer wall of the upper part of the hollow mandrel 16 is movably connected with the inner wall of the upper end of the rubber replacement hydraulic cylinder 13, and a plurality of groups of positioning and centering steel balls 11 are installed on the inner wall of the rubber base seal ring 15 to form an upper centering structure;
the lower sealing oil scraping structure is connected with the upper righting structure through a limiting support plate 18 and a connecting bolt 12, and the limiting support plate 18 is used for limiting the distance between the seat sealing hydraulic cylinder 5 and the rubber replacing hydraulic cylinder 13 and is fixedly connected with the seat sealing hydraulic cylinder through the connecting bolt 12; the inner cavity of the limiting support plate 18 is a sealing cylinder 14, a sealing base sleeve 9, a sealing rubber core 10 and an easily replaceable rubber pad 8 are added in the inner cavity of the sealing cylinder 14, the sealing rubber core 10 is arranged in the inner cavity of the sealing base sleeve 9, and the easily replaceable rubber pad 8 is respectively arranged at the upper end and the lower end of the sealing rubber core 10; the limit supporting plate 18 is opened or closed by controlling the up-and-down movement of the sealing cylinder 14, and the sealing base sleeve 9, the sealing rubber core 10 or the easy-replacing rubber pad 8 in the inner cavity of the sealing cylinder 14 are replaced.
Wherein, the limit supporting plate 18 is an arc structure, and the limit supporting plate 18 covers the outer side of the sealing cylinder 14.
The inner wall of the rubber replacement hydraulic cylinder 13 is provided with a first through hole 13.1 and a second through hole 13.2, a cavity formed between the inner wall of the rubber replacement hydraulic cylinder 13 and the outer wall of the hollow mandrel 16 can be used for the sealing cylinder 14 to move up and down, the first through hole 13.1 on the inner wall of the rubber replacement hydraulic cylinder 13 communicates the telescopic cavity with the outside, and when pressure is injected from the outside, the sealing cylinder 14 moves down; the second through hole 13.2 communicates the lower edge of the top projection of the sealing cylinder 14 with the outside, and when pressure is injected from the outside, the pressure pushes the lower edge of the top projection of the sealing cylinder 14 from bottom to top, and pushes the sealing cylinder 14 to move upwards.
In addition, regarding the rubber replacement cylinder 13, it is further explained that: an inlet 13.3 of the first through hole 13.1 is arranged on the outer wall of the lower side of the rubber replacement hydraulic cylinder 13, an outlet 13.4 is arranged on the inner wall of the upper side of the rubber replacement hydraulic cylinder 13, a cavity formed by the inner wall of the rubber replacement hydraulic cylinder 13 and the outer wall of the hollow mandrel 16 is a cavity with the sealing cylinder 14 moving up and down, and the sealing cylinder 14 moves down when pressure is injected into the cavity;
in addition, a second inlet 13.5 of the second through hole 13.2 is provided at the lower outer wall of the other end of the rubber-replacing cylinder 13, and a second outlet 13.6 is provided at the convex lower edge of the top of the sealing cylinder 14 to communicate the convex lower edge of the top of the sealing cylinder 14 with the outside, so that the sealing cylinder 14 is moved upward by the injection of pressure from the second inlet 13.5.
The split ring oil wiper 3 is in a bell mouth shape, the outer wall of the lower joint 1 is provided with an oil and sewage injection hole 17, the oil and sewage injection hole 17 is arranged at the lower side of the split ring oil wiper 3, the split ring oil wiper 3 is arranged at the boss of the inner cavity of the lower joint 1, the narrow part is downward, the wide part is upward, the upper surface is matched with rubber expanding when encountering oil, and crude oil on the outer wall of the continuous oil pipe is hung through the narrow bell mouth structure at the lower side.
The seat seal piston 2 is of a cylindrical structure, a piston bulge is arranged in the middle of the outer wall and is in contact with the top of the lower joint 1 through the piston bulge, and the outer wall of the piston bulge is movably connected with the inner wall of a seat seal hydraulic cylinder 5.
The rubber compression ring 6 is made of brass, the lower part of the rubber compression ring 6 is pressed on the seat seal piston 2, and the upper part of the rubber compression ring is contacted with the easy-changing rubber pad 8; a plurality of centering steel balls 7 are radially arranged on the rubber compression ring 6, and each centering steel ball 7 is arranged in the rubber compression ring 6 through a spring steel ball support 19.
The rubber seat seal ring 15 is provided with a plurality of groups of positioning and centering steel balls 11, the bottom of the rubber seat seal ring 15 is provided with a centering steel ball 7 and a spring steel ball support 19, the rubber seat seal ring 15 is made of brass, specifically, the rubber seat seal ring can be made of brass H69, the material is soft, and damage to rubber and a continuous oil pipe is avoided; in addition, the formula of the rubber expanding with oil is as follows: 70-100 parts of acrylic rubber particles, 0.2-0.3 part of tetraethylene glycol dimethacrylate, 0.3-0.5 part of 1, 3-butylene glycol dimethacrylate and 9-10 parts of white carbon black. The prior art formula can also be adopted, and the formula can also be adjusted according to different requirements.
In addition, the inner wall of the rubber seal base ring 15 is provided with a plurality of groups of cylindrical holes 15.1, the opening close to the inner wall is smaller than the diameter of the cylindrical holes, the cylindrical holes are stuffed with positioning and centering steel balls 11, the outer ends of the cylindrical holes are fixedly supported and positioned by bolts to center the steel balls 11, the bottom of the rubber seal base ring 15 is provided with an oblong hole, a centering steel ball 7 is arranged in the oblong hole, and a spring steel ball support 19 is arranged; in addition, the rubber compression ring 6 is also provided with an elongated cylindrical hole, a centering steel ball 7 is arranged in the elongated cylindrical hole, and a spring steel ball support 19 is arranged in the elongated cylindrical hole.
The invention provides a using method of a coiled tubing dynamic sealing device, which adopts the technical scheme that the using method comprises the following steps:
firstly, when a coiled tubing is put into a well, the coiled tubing passes through a rubber seat seal ring 15 in a hollow mandrel 16, a plurality of groups of positioning and centering steel balls 11 play a centering role, sliding friction is replaced by rolling friction, the coiled tubing is smoothly put into a seal base sleeve 9, a seal rubber core 10 and a replaceable rubber pad 8, the seal rubber core 10 and the replaceable rubber pad 8 play a dynamic seal role on the coiled tubing, the coiled tubing continuously goes downwards, and then the rubber press ring 6 and an oil-swelling rubber 4 are passed through, the outer wall of the coiled tubing does not contain crude oil, and the oil-swelling rubber 4 is in a shrinkage state, so that the coiled tubing is smoothly put into the well;
secondly, when the continuous oil pipe is lifted, the split ring oil scraper 3 is in a bell mouth shape, crude oil on the outer wall of the continuous oil pipe can be hung down, the hung crude oil is discharged through the oil injection blow-off hole 17, and the omitted crude oil passes through the oil-encountering expansion rubber 4 to expand the oil-encountering expansion rubber 4, so that the crude oil is further erased; the continuous oil pipe continuously passes through a sealing base sleeve 9, a sealing rubber core 10 and an easily replaceable rubber pad 8 in an inner cavity of a sealing cylinder 14 to realize dynamic sealing, when the sealing rubber core 10 or the easily replaceable rubber pad 8 is not tightly sealed, high pressure needs to be injected through a second through hole to push the sealing cylinder 14 upwards, a connecting bolt 12 is loosened, a limiting support plate 18 is opened, so that the easily replaceable rubber pad 8 is replaced, the limiting support plate 18 is closed after replacement is finished, the connecting bolt 12 is screwed down, high pressure is injected through the first through hole to push the sealing cylinder 14 downwards, and the work of replacing the easily replaceable rubber pad 8 is completed; at the moment, the coiled tubing continues to pass through the hollow mandrel 16 and the positioning and centering steel ball 11 until the coiled tubing is lifted out of the wellhead, and the coiled tubing is coiled by a coil device outside the wellhead;
if the easily replaced rubber pads 8 are still not tightly sealed after being replaced for many times, high pressure needs to be injected through the second through hole, the sealing cylinder 14 is pushed upwards for a large distance, the connecting bolt 12 is loosened, the limiting support plate 18 is opened, the sealing base sleeve 9 is taken out, the sealing rubber core 10 is replaced, and meanwhile the easily replaced rubber pads 8 at the two ends are replaced; then, the limiting support plate 18 is closed, the connecting bolt 12 is screwed down, high pressure is injected through the first through hole, the sealing cylinder 14 is pushed downwards, and the rubber gasket 8 easy to replace is replaced.
In the embodiment 2, the easily-replaced rubber pad 8 is of a circular structure, and a bevel cut is cut in the middle of the easily-replaced rubber pad, so that the easily-replaced rubber pad can be conveniently sleeved on a coiled tubing in work through the bevel cut; in addition, the sealing base sleeve 9 of the invention is a cylindrical structure, and the outer diameter of the sealing base sleeve is not larger than the inner diameter of the sealing cylinder 14; the outer diameter of the sealing rubber core 10 is not more than the inner diameter of the sealing base sleeve 9, so that the sealing rubber core 10 is arranged in the inner cavity of the sealing base sleeve 9, and two ends of the sealing rubber core 10 are respectively provided with one or more groups of easily replaced rubber pads 8; the hardness of the sealing base sleeve 9 is greater than that of the sealing rubber core 10.
The middle part of the sealing base sleeve 9 is contacted with the sealing rubber core 10, the inner diameters of two ends are larger than the inner diameter of the middle part, the sealing base sleeve is provided with the wedge-shaped cavity 9.1, the outer diameter of the easy-to-replace rubber gasket 8 is larger than the outer diameter of the sealing rubber core 10, the structure can enable the easy-to-replace rubber gasket 8 and the sealing rubber core 10 to have better sealing effect, and particularly after being extruded, the sealing effect of the easy-to-replace rubber gasket 8 and the sealing rubber core 10 is better than that of the direct connection of the easy-to-replace rubber gasket and the sealing rubber core.
Moreover, the split type sealing structure designed by the invention avoids the problems existing in the prior art that the whole rubber cylinder is adopted, firstly, when the rubber cylinder is damaged or broken in operation, the whole rubber cylinder needs to be replaced, so that the cost is increased, and the probability of environmental pollution is increased; and secondly, the original integral rubber cylinder may have the situation of sealing failure, and in the moving process of the coiled tubing, the dynamic sealing effect is not good due to back-and-forth friction. By adopting the split structure, the wedge-shaped cavity is also arranged at the contact part of the easily replaced rubber pad and the sealing rubber core, so that the problems can be solved, and the dynamic sealing effect is improved.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (2)
1. A coiled tubing dynamic seal device is characterized in that: comprises a lower joint (1), a seat seal piston (2), a split ring oil wiper (3), rubber (4) which expands when meeting oil, a seat seal hydraulic cylinder (5), a rubber press ring (6), an easily replaced rubber pad (8), a seal base sleeve (9), a seal rubber core (10), a positioning and centering steel ball (11), a connecting bolt (12), a rubber replacement hydraulic cylinder (13), a seal cylinder (14), a rubber seat seal base ring (15), a hollow core shaft (16) and a limit support plate (18), wherein the split ring oil wiper (3) is arranged at an inner cavity boss of the lower joint (1), the upper part of the lower joint (1) is movably connected with the seat seal hydraulic cylinder (5), a seat seal piston (2) is arranged in the inner cavity of the seat seal hydraulic cylinder (5), rubber (4) which expands when meeting oil is arranged in the inner cavity of the seat seal piston (2), a rubber pressure ring (6) is arranged at the top of the seat sealing piston (2) to form a lower sealing oil scraping structure;
the rubber replacement hydraulic cylinder (13) is connected with the sealing cylinder (14), the hollow mandrel (16) is installed at the upper end of the sealing cylinder (14), the rubber base seal ring (15) penetrates into the inner cavity of the hollow mandrel (16) upwards along the bottom of the hollow mandrel (16), the outer wall of the upper portion of the hollow mandrel (16) is movably connected with the inner wall of the upper end of the rubber replacement hydraulic cylinder (13), and a plurality of groups of positioning and centering steel balls (11) are installed on the inner wall of the rubber base seal ring (15) to form an upper centering structure;
the lower sealing oil scraping structure is connected with the upper righting structure through a limiting support plate (18) and a connecting bolt (12), the limiting support plate (18) is used for limiting the distance between the seat sealing hydraulic cylinder (5) and the rubber replacement hydraulic cylinder (13), and the seat sealing hydraulic cylinder (5) is fixedly connected with the rubber replacement hydraulic cylinder (13) through the connecting bolt (12); the inner cavity of the limiting support plate (18) is a sealing cylinder (14), a sealing base sleeve (9), a sealing rubber core (10) and an easily-replaceable rubber pad (8) are added in the inner cavity of the sealing cylinder (14), the sealing rubber core (10) is arranged in the inner cavity of the sealing base sleeve (9), and the easily-replaceable rubber pads (8) are respectively arranged at the upper end and the lower end of the sealing rubber core (10); the limiting support plate (18) is opened or closed by controlling the up-and-down movement of the sealing cylinder (14), the sealing base sleeve (9) and the sealing rubber core (10) or the easily replaced rubber pad (8) in the inner cavity of the sealing cylinder (14) are replaced, high pressure can be injected through the second through hole, the sealing cylinder (14) is pushed upwards, the connecting bolt (12) is loosened, the limiting support plate (18) is opened, the easily replaced rubber pad (8) is replaced, the limiting support plate (18) is closed after replacement, the connecting bolt (12) is screwed, high pressure is injected through the first through hole, the sealing cylinder (14) is pushed downwards, and the work of replacing the easily replaced rubber pad (8) is completed;
the easy-to-replace rubber pad (8) is of a circular structure, and a bevel cut is cut in the middle of the easy-to-replace rubber pad, so that the easy-to-replace rubber pad can be conveniently sleeved on a continuous oil pipe in work through the bevel cut; in addition, the sealing base sleeve (9) is of a cylindrical structure, and the outer diameter of the sealing base sleeve is not larger than the inner diameter of the sealing cylinder (14); the outer diameter of the sealing rubber core (10) is not more than the inner diameter of the sealing base sleeve (9), so that the sealing rubber core (10) is arranged in the inner cavity of the sealing base sleeve (9), and more than one group of easily replaced rubber pads (8) are respectively arranged at two ends of the sealing rubber core (10); the hardness of the sealing base sleeve (9) is greater than that of the sealing rubber core (10).
2. The coiled tubing dynamic seal of claim 1, wherein: the rubber seal ring (15) is provided with a plurality of groups of positioning and centering steel balls (11), the bottom of the rubber seal ring (15) is provided with the positioning and centering steel balls (11) and a spring steel ball support (19), and the rubber seal ring (15) is made of brass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911189958.9A CN110821439B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711248465.9A CN107989569B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
| CN201911189958.9A CN110821439B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711248465.9A Division CN107989569B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110821439A CN110821439A (en) | 2020-02-21 |
| CN110821439B true CN110821439B (en) | 2021-10-08 |
Family
ID=62034942
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911190696.8A Active CN110725662B (en) | 2017-12-01 | 2017-12-01 | Device for petroleum industry |
| CN201911189958.9A Active CN110821439B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
| CN201711248465.9A Active CN107989569B (en) | 2017-12-01 | 2017-12-01 | Coiled tubing dynamic seal device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109356547A (en) * | 2018-11-30 | 2019-02-19 | 成都托克密封件有限责任公司 | A kind of high-temperature and high-presure resistent small size packer |
| CN109403952B (en) * | 2018-12-14 | 2020-05-12 | 东营职业学院 | Split fit testing device for coiled tubing well logging |
| CN110374553A (en) * | 2019-07-23 | 2019-10-25 | 建湖县帅牛机械有限公司 | A kind of sucker rod of effectively anti-sway leakproof |
| CN111485846A (en) * | 2020-04-28 | 2020-08-04 | 黄汝芬 | Convenient to use's blowout preventer for subsea tree |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN110725662A (en) | 2020-01-24 |
| CN110821439A (en) | 2020-02-21 |
| CN110725662B (en) | 2021-11-05 |
| CN107989569A (en) | 2018-05-04 |
| CN107989569B (en) | 2020-05-01 |
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Inventor after: Li Fusong Inventor after: Wang Luyang Inventor before: Wang Luyang |
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Effective date of registration: 20210916 Address after: 276000 west of Fengguo Road, economic development zone, Yishui County, Linyi City, Shandong Province Applicant after: SHANDONG JINGGONG SEALING TECHNOLOGY Co.,Ltd. Address before: 257091 No. 105, Liaohe Road, Dongying District, Dongying City, Shandong Province Applicant before: Wang Luyang |
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Denomination of invention: Coiled tubing dynamic sealing device Effective date of registration: 20220104 Granted publication date: 20211008 Pledgee: Shandong Yishui Rural Commercial Bank Co., Ltd Pledgor: SHANDONG JINGGONG SEALING TECHNOLOGY Co.,Ltd. Registration number: Y2021980017328 |
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