CN107143298A - Oil well head annular space sealing device - Google Patents

Oil well head annular space sealing device Download PDF

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Publication number
CN107143298A
CN107143298A CN201710446421.0A CN201710446421A CN107143298A CN 107143298 A CN107143298 A CN 107143298A CN 201710446421 A CN201710446421 A CN 201710446421A CN 107143298 A CN107143298 A CN 107143298A
Authority
CN
China
Prior art keywords
sealing
ring
annular space
annular groove
well head
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710446421.0A
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Chinese (zh)
Inventor
李海庆
唐建平
薛庆华
程贵华
侯祖刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DEZHOU UNITED PETROLEUM MACHINERY Co Ltd
Original Assignee
DEZHOU UNITED PETROLEUM MACHINERY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DEZHOU UNITED PETROLEUM MACHINERY Co Ltd filed Critical DEZHOU UNITED PETROLEUM MACHINERY Co Ltd
Priority to CN201710446421.0A priority Critical patent/CN107143298A/en
Publication of CN107143298A publication Critical patent/CN107143298A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/02Surface sealing or packing
    • E21B33/03Well heads; Setting-up thereof

Abstract

The invention discloses a kind of oil well head annular space sealing device, for the sealing of annular space between wellhead sealing body and petroleum pipeline, at least one 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, is flush-mounted in the annular groove, and the sealing ring is used in radial seal annular groove by being engaged with annular groove wall, and is used for by being engaged with oil pipe outer wall to annular space sealing;Power ring, in the annular groove, and between annular groove bottom land and sealing ring;And fill assembly, the entrance loaded on hand-hole, the fluid for injecting given pressure, so that power ring promotes sealing ring to compress petroleum pipeline.Require relatively low according to seal deformability of the present invention, but sealability can be effectively improved.

Description

Oil well head annular space sealing device
Technical field
The present invention relates 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- (the reason for petroleum pipeline seal clearance is much larger than the seal clearance of Hydraulic Industry is outside the sealing surface i.e. petroleum pipeline of petroleum pipeline to 0.5%D Footpath tolerance is very big), wherein D is 5.5 inches of outside dimension.Thus produced petroleum pipeline and the sealing sheet being enclosed on petroleum pipeline An annular space can be formed between body (i.e. wellhead assembly), should at least have the sealing energy in 2.495 millimeters of gaps to the sealing of annular section 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.
It has the disadvantage:
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 bear at these elevated temperatures 0 to 138MPa pressure and be that corrosive fluid pressure under the conditions of wide arc gap then seals mistake Lose rate very high.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, based on metallic framework Positioning, it is domestic to use post-cure technique mostly, although to solve the problem of metallic framework is fixed, but also make the resistance to height of seal Warm nature can decline to a great extent with intensity.
The A of Chinese patent literature CN 101984214 disclose one kind and sealedly mended for annular space 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, makes blowout prevention gum cover distending, so as to realize the sealing of annular space.Blowout prevention gum cover is acquisition than larger Radial direction distending degree it is necessary to have than larger 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.
Chinese patent literature CN205823223U depends on pushing for clamping nut for the sealing of well head annular space, makes packing Unit is produced and is radially expanded, so that the radial space for filling well head annular space realizes sealing.However, being based on being radially expanded reality to realize Now seal, on the one hand need packing units that there is relatively high 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 than larger, simple being radially expanded realizes the sealed difficulty of annular space than larger, in addition Packing units are elastic components, and the controllability being radially expanded is inherently poor, it is desirable to which 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.
In addition, in such as Chinese patent literature CN202673223U, itself and Chinese patent literature CN205823223U, and The radial deformation that CN204252908U all relies on rubber parts realizes that annular space is sealed.To realize that sealed actuator is two hard Packing element is, it is necessary to by hydraulic coupling or mechanical forces compress the two ebonites cylinder 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 deflection than larger rubber parts, as it was previously stated, rubber parts is to environment temperature Tolerance level is than relatively low, easily failure.
The content of the invention
In view of this, relatively low is required to seal deformability it is an object of the invention to provide a kind of, but can be effective Improve the oil well head annular space sealing device of sealability.
According to embodiments of the invention there is provided a kind of oil well head annular space sealing device, for wellhead sealing body and stone The sealing of annular space between oil pipe, at least one annular groove is provided with the internal face of seal body, and is provided with and is communicated in seal body Annular groove centrifuges the hand-hole at end;So as to which oil well head annular space sealing device further comprises:
Sealing ring, is flush-mounted in the annular groove, and 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, the fluid for injecting 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 two 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, and 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 and sealing ring is two discrete parts or are structure as a whole;
If during discrete two parts, during assembling in annular groove, two parts are fixedly connected, or power ring inner face 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 and connect a pressure testing mouthful.
According to embodiments of the invention, constrained by annular groove, the controllability of the deformation of sealing ring is relatively good, in addition, sealing Circle is guided by annular groove in radial direction, and it, which is deformed, only needs to consider the deformation in sealed body radial direction, and the requirement to deflection is relative It is smaller, so as to select the deformability more preferable material of not high but temperature tolerance, corrosion resistance relatively.Power ring and annular groove bottom land Space stiffness it is relatively large, and space it is also relatively small (than blowout prevention gum cover in Chinese patent literature CN101984214A with Space between sealed cylinder block is much smaller) fluid of given pressure that is injected by fill assembly is to the start effect of 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 testings mouthful, 9. casing head of well head.
11. sealing cap, 12. heads, 13. connectors.
Embodiment
It is a set of oil well head casing head with reference to Figure of description 1, 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 is vertically arranged, and is hanged in Process of Oil Well Drilling The device of hanging sleeve tube head and sealing sleeve pipe annular space, casing head therein is the seal body 6 shown in figure, is oil well head (oil well head includes a part:Casing head, tubing head and the part of production tree three).
As described in the background section, because the tolerance range of petroleum pipeline 5 is relatively wide between seal body 6 and petroleum pipeline 5, and have Than larger 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 that is 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 relatively wide tolerance range, there is the annular space of one fixed width between seal body 6 and petroleum pipeline 5.
Seal body 6, which has, is used for the centre bore that petroleum pipeline 5 is passed 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, makes power ring 3 possess relatively large bearing area, so as to obtain than larger motive force.
In certain embodiments, if the outside of power ring 3 centrifuge in other words side for cylinder, based on annular groove bottom land Engagement, still with the larger compression area that compares.
It should be appreciated that compression area is malleation area in the radial direction, or the face perpendicular with radial direction throwing 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 be using hand-hole 2 as indicated in figs. 1 and 3, it would however also be possible to employ 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, the annular groove is flush-mounted in, it is specifically, close Seal 4 be located at annular groove notch end, so as to petroleum pipeline 5, pass through mechanically engage realize sealing.
Sealing is by 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 than larger, but high temperature resistant, corrosion resistance are than relatively low rubber seal.But can select to become Shape amount is relatively small, but the relatively good material of high temperature resistant, corrosion resistance, and such as polytetrafluoroethylene (PTFE) is close so as to extend well head The maintenance period of seal apparatus.
One layer can also be covered with sealing ring 4 on the surface of conventional hermetic circle using teflin ring is covered 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 is received between annular groove bottom land and sealing ring 4 there is provided sealing ring 4 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 is loaded on the entrance of hand-hole 2, the centrifugation end in seal body 6 of hand-hole 2 as shown in Figure 1.
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, such as stop-leak compound can be filled using ascending pipe, 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 be the sheet of fill assembly 1 Body, the two 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 construction is on body, and it includes a valve ball, in fluid note Enter the reverse there is provided a spring compression valve ball of direction, 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 Sideways, so that annular space has than larger seal interface area.
In addition, the seal of rectangular end face, make the top and bottom of sealing ring 4 also has relatively large connect with the wall of annular groove Conjunction face area.
Further, the section of the seal of sealing ring 4 is square, and the section of the seal of power ring 3 is circle, so that 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
, can be using conventional O-shaped rubber seal for power ring 3, it is different from sealing ring 4, not with annular space Gas is contacted.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, it would however also be possible to employ integrative-structure, using integral knot During structure, preferably both use identical material.
If during discrete two parts, during assembling in annular groove, two parts are fixedly connected, or power ring 3 is interior Face is engaged 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 mouthful 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 mouthful 8, the outlet of pressure testing mouthful 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 annular groove in the internal face of seal body, and be provided with seal body and to be communicated to the note that annular groove centrifuges end Enter hole;So as to which oil well head annular space sealing device further comprises:
Sealing ring, is flush-mounted in the annular groove, and 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, the fluid for injecting 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 two 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;
If during discrete two parts, during assembling in annular groove, two parts are fixedly connected, or power ring inner face 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.
CN201710446421.0A 2017-06-07 2017-06-07 Oil well head annular space sealing device Pending CN107143298A (en)

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Application publication date: 20170908