CN207017968U - Oil well head annular space sealing device - Google Patents
Oil well head annular space sealing device Download PDFInfo
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- CN207017968U CN207017968U CN201720694857.7U CN201720694857U CN207017968U CN 207017968 U CN207017968 U CN 207017968U CN 201720694857 U CN201720694857 U CN 201720694857U CN 207017968 U CN207017968 U CN 207017968U
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- sealing
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- annular space
- annular groove
- seal
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Abstract
The utility model discloses a kind of oil well head annular space sealing device, and for the sealing of annular space between wellhead sealing body and petroleum pipeline, at least one of annular groove is provided with the internal face of seal body, and the hand-hole for being communicated to annular groove centrifugation end is provided with seal body;So as to which oil well head annular space sealing device further comprises:Sealing ring, flush-mounted in the annular groove, the sealing ring is used in radial seal annular groove by being engaged with annular groove wall, and is used to seal annular space by engaging with oil pipe outer wall;Power ring, in the annular groove, and between annular groove bottom land and sealing ring;And fill assembly, the entrance loaded on hand-hole, for injecting the fluid of given pressure, so that power ring promotes sealing ring to compress petroleum pipeline.Require relatively low according to the utility model seal deformability, but sealability can be effectively improved.
Description
Technical field
It the utility model is related to a kind of oil well head annular space sealing device.
Background technology
Oil drilling and the scope KU (- 60 DEG C to 121 DEG C) for the most frequently used operating temperature of recovering the oil, operating temperature range compares
Greatly, and OCTG cylindrical tolerance based on 5.5 inches of petroleum pipelines, its cylindrical tolerance be its diameter dimension+1%D to-
(it is the sealing surface of petroleum pipeline i.e. outside petroleum pipeline that petroleum pipeline seal clearance is much larger than the reason for seal clearance of Hydraulic Industry to 0.5%D
Footpath tolerance is very big), wherein D is 5.5 inches of outside dimension.Thus caused petroleum pipeline and the sealing sheet being enclosed on petroleum pipeline
An annular space can be formed between body (i.e. wellhead assembly), the sealing to annular section should at least have the sealing energy in 2.495 millimeters of gaps
Power.So big gap is all test to any rubber seal, and operating mode is extremely severe, such as -60 DEG C to 121 DEG C of work
Condition, and medium to be sealed contains the corrosive fluids such as hydrogen sulfide.
The existing encapsulating method of annular space mainly has three kinds between wellhead assembly and petroleum pipeline:BT sealings, p-type sealing, FS sealings.
These three sealing devices use rubber parts as body seal, in rubber parts plus metallic framework, using inject stop-leak compound or
Embedded spring provides the annular space that sealed motive force comes between well top sealing device and petroleum pipeline.This several encapsulating method is oil well head
Industry forerunners survey and draw to the seventies in the sixties in last century and copy that imported from America sealing ring is improved to be formed.
Its shortcoming is:
1. the resistance to elevated temperatures of rubber is poor, although nominally high-grade rubber can be resistant to more than 121 degree Celsius of high temperature,
But if bearing 0 to 138MPa pressure at these elevated temperatures and being that corrosive fluid pressure under the conditions of wide arc gap then seals mistake
It is very high to lose rate.Import or the domestic import producer that substitutes cause percent defective higher because its processing technology is complicated, and cost also compares
The sealing ring of height, such as 5-1/2 " specification, its market price also nearly 1,000 yuan RMB.
2. the metallic framework of seal further increases the difficulty of processing of rubber seal, in addition, being based on metallic framework
Positioning, the country use post-cure technique, although solving the problems, such as metallic framework fixation, also make the resistance to height of seal mostly
Warm nature can decline to a great extent with intensity.
The A of Chinese patent literature CN 101984214 disclose a kind of benefit for being used for annular space sealing between well mouth oil pipe and sleeve pipe
Formula annular preventer is repaid, its seal is annular blowout prevention gum cover, blowout prevention gum cover peripheral hardware sealing cylinder, so as to be formed between sealing cylinder
Fliud flushing space, using fluid pressure, make blowout prevention gum cover distending, so as to realize the sealing of annular space.Blowout prevention gum cover is bigger to obtain
Radial direction distending degree it is necessary to have bigger axial length, it is necessary to the space occupied is larger, and as it was previously stated, its material
It is rubber, under conditions of skeleton (i.e. metallic framework) is not configured, although reducing difficulty of processing, itself also easily failure.
Sealings of the Chinese patent literature CN205823223U for well head annular space depends on pushing for clamping nut, makes packing
Unit is produced and is radially expanded, and sealing is realized so as to fill the radial space of well head annular space.However, it is based on being radially expanded reality to realize
Now seal, on the one hand need packing units that there is higher deformability, on the other hand, it is deformed should have it is relatively good can
Control property.However, as it was previously stated, well head annular space is bigger, simple being radially expanded realizes that the difficulty of annular space sealing is bigger, in addition
Packing units are elastic components, and the controllability being radially expanded is inherently poor, it is desirable to packing units have high isotropism,
Otherwise it is difficult to the controllability of radial deformation.
Similarly, such as Chinese patent literature CN204252908U is also realized pair by the way of by plug extruding glue core
The sealing of well head annular space.
Such as Chinese patent literature CN202673223U in addition, itself and Chinese patent literature CN205823223U, and
The radial deformation that CN204252908U all relies on rubber parts realizes that annular space seals.To realize that the actuator of sealing is two hard
Packing element is, it is necessary to by the hydraulic coupling or mechanical forces compress the two ebonite cylinders of axial direction, and axial movable part is more, assembly space
Smaller, ebonite cylinder drive device assembly difficulty is relatively large.
Above prior art is generally using the bigger rubber parts of deflection, as it was previously stated, rubber parts is to environment temperature
Tolerance level is than relatively low, easily failure.
Utility model content
In view of this, the purpose of this utility model be to provide it is a kind of relatively low is required to seal deformability, but can
Effectively improve the oil well head annular space sealing device of sealability.
According to embodiment of the present utility model, there is provided a kind of oil well head annular space sealing device, for wellhead sealing body
The sealing of annular space between petroleum pipeline, at least one of annular groove, and the company of being provided with seal body is provided with the internal face of seal body
Lead to the hand-hole at annular groove centrifugation end;So as to which oil well head annular space sealing device further comprises:
Sealing ring, flush-mounted in the annular groove, the sealing ring is used in radial seal annular groove by being engaged with annular groove wall, and
It is used to seal annular space by engaging with oil pipe outer wall;
Power ring, in the annular groove, and between annular groove bottom land and sealing ring;And
Fill assembly, the entrance loaded on hand-hole, for injecting the fluid of given pressure, so that power ring promotes sealing ring
Compress petroleum pipeline.
Above-mentioned oil well head annular space sealing device, alternatively, the fill assembly include a check valve.
Alternatively, the fill assembly includes a body, and the both ends of the body are respectively provided with connection screw thread;
Wherein, one end connection screw thread is used for being fixedly connected for body and hand-hole, and other end connection screw thread is then used to be equipped with
Sealing cap, to block pipe fitting by sealing cap.
Alternatively, the check valve is located in body.
Alternatively, the section of the seal of sealing ring is rectangle.
Alternatively, the section of the seal of sealing ring is square that the section of the seal of power ring is circle;
Wherein, power ring engages realization sealing radial seal with the wall of annular groove.
Alternatively, the sealing ring is teflin ring or covers teflin ring;
Power ring is O-shaped rubber seal, O-shaped teflin ring or O-shaped covers teflin ring.
Alternatively, power ring for two discrete parts or is structure as a whole with sealing ring;
During if two discrete parts, during assembling in annular groove, two parts are fixedly connected, or the inner face of power ring
Engaged with the outside of sealing ring.
Alternatively, the annular groove has twice.
Alternatively, hand-hole is the radial hole of seal body radial direction;Twice annular groove is equipped with the annular space constrained after sealing ring
Axial space pass through a radial hole connect a pressure testing mouth.
According to embodiment of the present utility model, being constrained by annular groove, the controllability of the deformation of sealing ring is relatively good, in addition,
Sealing ring is guided by annular groove in radial direction, and it, which is deformed, only needs to consider the deformation in sealed body radial direction, the requirement to deflection
It is relatively small, so as to select deformability relatively not high but the more preferable material of temperature tolerance, corrosion resistance.Power ring and annular groove
The space stiffness of bottom land is relatively large, and space is also relatively small (than anti-glue spraying in Chinese patent literature CN101984214A
Cover sealed cylinder block between space it is much smaller) by fill assembly inject given pressure fluid acting to power ring
Directionality is stronger, and the uncertainty of deformation is smaller, so as to be easily achieved relatively reliable sealing.
Brief description of the drawings
Fig. 1 is embodiment petrochina well head annular space sealing device assembling structure schematic diagram on wellhead equipment.
Fig. 2 is Fig. 1 A portions enlarged drawing.
Fig. 3 is that an embodiment petrochina well head ring control sealing device master cuts open structural representation.
Fig. 4 is Fig. 3 Z portions enlarged drawing.
In figure:1. fill assembly, 2. hand-holes, 3. power rings, 4. sealing rings, 5. petroleum pipelines, 6. seal bodies, 7. pressure testings
Mouthful, 8. pressure testing mouths, 9. casing head of well head.
11. sealing cap, 12. heads, 13. connectors.
Embodiment
With reference to Figure of description 1, it is a set of oil well head casing head, is that well head annular space sealing device exists in some embodiments
Assembling structure on wellhead equipment, it is vertical structure on the whole, or perhaps be vertically arranged, it is to be hanged in Process of Oil Well Drilling
The device of hanging sleeve tube head and sealing sleeve pipe annular space, casing head therein are the seal body 6 shown in figure, are oil well heads
(oil well head includes a part:Casing head, tubing head and production tree three parts).
As described in the background section, because the tolerance range of petroleum pipeline 5 is wider between seal body 6 and petroleum pipeline 5, and have
Bigger annular space.
It is understood that the miscellaneous part being equipped with based on pipe fitting and around pipe fitting, radially, axially with circumference generally
Using the pipe fitting surrounded as reference data.
Oil well head annular space sealing device so as shown in Figure 3 is used for annular space between wellhead sealing body 6 and petroleum pipeline 5
Sealing, seal body 6 shown in figure and the coaxial line of petroleum pipeline 5, and seal body 6 is enclosed on petroleum pipeline 5, due to petroleum pipeline
5 have wider tolerance range, the annular space that one fixed width between seal body 6 and petroleum pipeline 5 be present.
Seal body 6, which has, is used for the centre bore that petroleum pipeline 5 passes through, and internal circular-grooves are provided with as shown in Figure 4 in the centre bore,
Abbreviation annular groove, internal circular-grooves are typically processed by internal circular-grooves cutting knife or boring cutter, and annular groove can at least house sealing ring 4 and power
Certain space is preferably left in circle 3, the wherein outside of power ring 3, that is, the centrifugation side of radial direction, rather than is close to annular groove
Bottom land, power ring 3 is set to possess relatively large bearing area, so as to obtain bigger motive force.
In certain embodiments, if the outside of power ring 3 centrifuges side in other words when being cylinder, based on annular groove bottom land
Engagement, still there is the larger compression area that compares.
It should be appreciated that compression area is malleation area in the radial direction, or the throwing in the face perpendicular with radial direction
Shadow area.
Annular groove durability shown in Fig. 4 is rectangle, and bottom land is vertical plane.And then introduced by fluid passage for pushing away
The fluid of dynamic power ring 3, fluid passage can use hand-hole 2 as indicated in figs. 1 and 3, can also use other kinds of
Fluid passage form, it will additionally be appreciated that because the processing of fluid passage is typically to be formed using depth drill lead plug, because
This, the hand-hole 2 shown in Fig. 1 and Fig. 3 is simple as far as possible, such as the radial hole shown in Fig. 1, and one time lead plug can be complete
Into.
In certain embodiments, fluid passage can be completed by lead plug twice, and it includes horizontal component and vertical portion,
Horizontal component therein can be exactly the hand-hole 2 shown in Fig. 1, so from the upper surface trip-out lead plug one of seal body 6 with
The vertical vertical hole of hand-hole 2, fluid piping is in the upper end of seal body 6.
On the fluid, the relatively large lipid sealant of preferred viscosities, it is not easy to produce from the centripetal side of sealing ring 4
Leakage.Certainly also it is not excluded for the use of other fluids.
On the sealing ring 4, in certain embodiments, as shown in figure 4, it is flush-mounted in the annular groove, it is specifically, close
Seal 4 is located at the notch end of annular groove, so as to petroleum pipeline 5, pass through mechanically engage realize sealing.
Sealing passes through the mobile holding petroleum pipeline of radial direction, and comparatively, the deflection of sealing ring 4 requires relatively small, from
And deflection may not necessarily be selected bigger, but high temperature resistant, corrosion resistance are than relatively low rubber seal.But it can select to become
Shape amount is relatively small, but the material that high temperature resistant, corrosion resistance are relatively good, such as polytetrafluoroethylene (PTFE), close so as to extend well head
The maintenance period of seal apparatus.
It can also be used on sealing ring 4 and cover teflin ring, i.e., be covered with one layer on the surface of conventional hermetic circle
Polytetrafluoroethylene (PTFE).
Sealing ring 4 is used with the structure that lower wall surface on annular groove is constrained and is interference fitted, and can be one based on self-deformation
Determine centripetal motion under thrust and hold petroleum pipeline 5 tightly.
On power ring 3, it is also contained in the annular groove, and between annular groove bottom land and sealing ring 4, there is provided sealing ring 4 is received
Tight extruding force.
Match somebody with somebody tube portion on hand-hole 2, its part-structure can be structured as fill assembly 1, as shown in figure 1, injection group
Part 1 be loaded on hand-hole 2 entrance, hand-hole 2 as shown in Figure 1 at the centrifugation end of seal body 6.
It is used for the fluid for importing given pressure by fill assembly 1, so that the centrifugation side of power ring 3 is pressurized and shunk,
And then banding sealing ring 4, sealing ring 4 is shunk, so as to hold petroleum pipeline 5 tightly, and is realized to annular space in the close of the axial direction of petroleum pipeline 5
Envelope.
In certain embodiments, as shown in Fig. 2 the fill assembly 1 includes a check valve, check valve can be reduced effectively
The influence of back-pressure.
In certain embodiments, ascending pipe can be used to fill such as stop-leak compound, pressure is held using the filling pressure of ascending pipe.
Controllable check valve can be used for check valve, you can to control valve element, but check valve reverse-conducting.
In the structure shown in Fig. 2, the fill assembly 1 includes a body, it is understood that is the sheet of fill assembly 1
Body, the both ends of the body are respectively provided with connection screw thread.
Wherein, one end connection screw thread is used for being fixedly connected for body and hand-hole 2, and other end connection screw thread is then for being equipped with
Sealing cap 11, to block pipe fitting by sealing cap 11.
Correspondingly, female thread portion is contained at the centrifugation end of hand-hole 2, for being attached with body by screw thread.
As shown in Fig. 2 one-way valve structures are relatively easy, directly for construction on body, it includes a valve ball, is noted in fluid
Enter the reverse of direction, there is provided a spring compression valve ball, so as to construct check valve.
The section of the seal of sealing ring 4 is preferably rectangular, especially the medial surface of sealing ring 4, i.e., towards petroleum pipeline 5
Side, so that annular space has bigger seal interface area.
In addition, the seal of rectangular end face, makes the top and bottom of sealing ring 4 also have relatively large connect with the wall of annular groove
Conjunction face area.
Further, the section of the seal of sealing ring 4 is square that the section of the seal of power ring 3 is circle, so as to
The depth of annular groove can be reduced, before this principle is explained, i.e. starting stage, power ring 3 is had relatively
Big bearing area.
Correspondingly, power ring 3 engages realization sealing radial seal with the wall of annular groove.
Preferably, the sealing ring 4 is teflin ring
For power ring 3, conventional O-shaped rubber seal can be used, it is different from sealing ring 4, not with annular space
Gas contacts.In certain embodiments, the preferably O-shaped teflin ring of power ring 3.
Power ring 3 can use two discrete parts with sealing ring 4, integrative-structure can also be used, using integral knot
During structure, preferably both use identical material.
During if two discrete parts, during assembling in annular groove, two parts are fixedly connected, or power ring 3 is interior
Face engages with the outside of sealing ring 4.
As shown in figure 1, in a preferred embodiment, the annular groove has twice.
Preferably, hand-hole 2 is the radial hole of the radial direction of seal body 6;Twice annular groove is equipped with the ring constrained after sealing ring 4
Empty axial space connects a pressure testing mouth 7 by a radial hole, in order to be detected to ring control sealing.
In certain embodiments, as shown in figure 1, being also equipped with pressure testing mouth 8, the outlet of pressure testing mouth 8 is located at bottom hand-hole 2
Downside, can be used for the sealing detection at initial stage.
Claims (10)
1. a kind of oil well head annular space sealing device, for the sealing of annular space between wellhead sealing body and petroleum pipeline, its feature exists
In being provided with least one of annular groove in the internal face of seal body, and be provided with seal body the note for being communicated to annular groove centrifugation end
Enter hole;So as to which oil well head annular space sealing device also includes:
Sealing ring, flush-mounted in the annular groove, the sealing ring is used in radial seal annular groove by being engaged with annular groove wall, and is passed through
Engaged with oil pipe outer wall and be used to seal annular space;
Power ring, in the annular groove, and between annular groove bottom land and sealing ring;And
Fill assembly, the entrance loaded on hand-hole, for injecting the fluid of given pressure, so that power ring promotes sealing ring to compress
Petroleum pipeline.
2. oil well head annular space sealing device according to claim 1, it is characterised in that it is single that the fill assembly includes one
To valve.
3. oil well head annular space sealing device according to claim 2, it is characterised in that the fill assembly includes a pipe
Body, the both ends of the body are respectively provided with connection screw thread;
Wherein, one end connection screw thread is used for being fixedly connected for body and hand-hole, and other end connection screw thread is then used to be equipped with sealing cap,
To block pipe fitting by sealing cap.
4. oil well head annular space sealing device according to claim 3, it is characterised in that the check valve is located at body
It is interior.
5. according to any described oil well head annular space sealing device of Claims 1 to 4, it is characterised in that the sealing of sealing ring
The section of body is rectangle.
6. oil well head annular space sealing device according to claim 5, it is characterised in that the section of the seal of sealing ring
To be square, the section of the seal of power ring is circle;
Wherein, power ring engages realization sealing radial seal with the wall of annular groove.
7. according to any described oil well head annular space sealing device of Claims 1 to 4, it is characterised in that the sealing ring is
Teflin ring covers teflin ring;
Power ring is O-shaped rubber seal, O-shaped teflin ring or O-shaped covers teflin ring.
8. oil well head annular space sealing device according to claim 7, it is characterised in that power ring is discrete with sealing ring
Two parts or be structure as a whole;
During if two discrete parts, during assembling in annular groove, two parts are fixedly connected, or the inner face of power ring with it is close
The outside engagement of seal.
9. according to any described oil well head annular space sealing device of Claims 1 to 4, it is characterised in that the annular groove has two
Road.
10. oil well head annular space sealing device according to claim 9, it is characterised in that hand-hole is seal body footpath
To radial hole;The axial space that twice annular groove is equipped with the annular space constrained after sealing ring connects a pressure testing by a radial hole
Mouthful.
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