CN106639958B - Wellhead steam injection puncture-proof sealing device - Google Patents
Wellhead steam injection puncture-proof sealing device Download PDFInfo
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- CN106639958B CN106639958B CN201710016599.1A CN201710016599A CN106639958B CN 106639958 B CN106639958 B CN 106639958B CN 201710016599 A CN201710016599 A CN 201710016599A CN 106639958 B CN106639958 B CN 106639958B
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- 238000007789 sealing Methods 0.000 title claims abstract description 118
- 238000010793 Steam injection (oil industry) Methods 0.000 title claims abstract description 24
- 238000012856 packing Methods 0.000 claims abstract description 66
- 230000002265 prevention Effects 0.000 claims abstract description 22
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 239000007921 spray Substances 0.000 claims description 30
- 238000003466 welding Methods 0.000 claims description 30
- 238000003825 pressing Methods 0.000 claims description 27
- 230000007704 transition Effects 0.000 claims description 19
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 13
- 230000006835 compression Effects 0.000 claims description 13
- 238000007906 compression Methods 0.000 claims description 13
- 229910052802 copper Inorganic materials 0.000 claims description 13
- 239000010949 copper Substances 0.000 claims description 13
- 239000003795 chemical substances by application Substances 0.000 claims description 11
- 230000001050 lubricating effect Effects 0.000 claims description 11
- 239000010687 lubricating oil Substances 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 6
- 229920006389 polyphenyl polymer Polymers 0.000 claims description 5
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 230000003746 surface roughness Effects 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 239000007770 graphite material Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 239000003921 oil Substances 0.000 description 8
- 239000010410 layer Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009837 dry grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- 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)
Abstract
The invention relates to the technical field of wellhead blowout preventers, in particular to a wellhead steam injection anti-puncture sealing device; the packing seal assembly comprises a packing seal assembly, a flexible pipe and a secondary seal assembly; the lower end of the packing seal assembly is connected with a secondary seal assembly through a flexible pipe; the secondary seal assembly comprises a blowout preventer barrel and a seal; the lower end of the flexible pipe is fixedly installed with the upper end of the blowout prevention barrel, at least one sealing element is arranged in the blowout prevention barrel, and the sealing element is a high-temperature and high-pressure resistant sealing element. The invention has reasonable and compact structure and convenient use; the blowout prevention barrel is connected to the packing seal assembly through the flexible pipe, so that the eccentric wear of a polish rod and a sealing element cannot occur; meanwhile, the high-temperature and high-pressure resistant sealing ring can be used for a long time in a high-temperature and high-pressure environment for steam injection, so that puncture and leakage are avoided, and effective sealing is guaranteed; the packing is changed conveniently, can the self-lubricating, and downhole pressure is prejudged, improves the effect with the dynamic seal performance of the packing seal assembly of well head.
Description
Technical Field
The invention relates to the technical field of wellhead blowout preventers, in particular to a wellhead steam injection anti-puncture sealing device.
Background
The polish rod sealing device of the general oil production well with the rod basically comprises a polish rod sealing box, a polish rod and a rubber gate valve, and has the following defects respectively:
1. polish rod sealing box
1. The packing is troublesome to replace, and the labor intensity is high;
the packing sealing cavity and the polish rod are matched to form an annular counter bore, the space is narrow and deep, rubber sealing elements and the like are difficult to take out or put in, the replacement work is troublesome, and the strength is high;
2. a pressure observation valve or a lubricating oil nozzle is not designed on the sealing box, so that the downhole pressure cannot be pre-judged; when the underground liquid supply is insufficient, lubricating oil cannot be added into the packing cavity, so that packing dry grinding failure is easily caused, and the sealing period is short;
3. the eccentric wear problem cannot be effectively solved, and the sealing period is short;
4. under the high temperature and high pressure of steam injection, accidents such as puncture, steam injection blowout at a well mouth and the like are easy to occur due to the problem of sealing packing materials.
2. Polish rod
Polished rods for oil fields are roughly classified into two types: the common polished rod and the surface spray-welded polished rod respectively have the following defects:
common polish rod
1. The surface of a common polished rod is not provided with a protective layer, so that clamping marks are easily formed on the surface when a clamp is fastened, the packing is severely abraded, and the sealing is ineffective;
(II) surface anticorrosion polish rod
1. The tolerance range of the outer diameter is large, and is generally-0.25 mm to +0.13mm; the sealing effect with the inner hole of the packing is poor;
2. the surface of the polished rod is not provided with a limit mark, so that the position of the lower end is difficult to judge in the lifting process, and well repair accidents are easy to cause;
3. the hardness of the surface spray welding layer or the plating layer is high, and the polished rod clip is easy to slip, so that potential safety hazards are formed.
Disclosure of Invention
The invention provides a wellhead steam injection anti-puncture sealing device, which overcomes the defects of the prior art and can effectively solve the problem that puncture is easy to occur due to the problem of sealing packing materials under the high-temperature and high-pressure steam injection.
The technical scheme of the invention is realized by the following measures: a kind of well head steam injection defends the sealing means of the puncture, including packing seal assembly, flexible pipe and second seal assembly; the lower end of the packing seal assembly is connected with a secondary seal assembly through a flexible pipe; the secondary seal assembly comprises a blowout preventer barrel and a seal; the lower end of the flexible pipe is fixedly installed with the upper end of the blowout prevention barrel, at least one sealing element is arranged in the blowout prevention barrel, and the sealing element is a high-temperature and high-pressure resistant sealing element.
The following is further optimization or/and improvement of the technical scheme of the invention:
the high-temperature and high-pressure resistant sealing element can be an inverted L-shaped flexible sealing ring with the cross section of the inverted L-shaped flexible sealing ring, and the lower end of the vertical section of the flexible sealing ring is inclined inwards to form a frustum; threads are arranged in the lower side of the blowout prevention barrel, a lower compression ring is fixedly installed on the lower compression ring through the threads, at least one flexible sealing ring is fixedly installed in the blowout prevention barrel at the upper end of the lower compression ring at intervals from bottom to top in sequence, and a support ring is installed in the blowout prevention barrel between the adjacent flexible sealing rings; the cross section of the support ring is L-shaped, and the support ring and the flexible sealing ring at the upper end of the support ring are mutually buckled and installed together; the upper end of the horizontal section of the support ring is provided with a conical clamping groove corresponding to the frustum, and the frustum is clamped in the conical clamping groove; the upper side of the blowout prevention barrel is internally provided with threads, and an upper clamp ring capable of pressing the flexible seal ring and the support ring downwards on the lower clamp ring is fixedly installed through the threads.
The upper side of the flexible pipe can be provided with external threads, and the upper side of the flexible pipe is fixedly installed with the packing seal assembly through threads; the lower side of the flexible pipe is provided with external threads, and the lower side of the flexible pipe is fixedly installed with the blowout preventing barrel through the threads; an upper tightening nut which can be tightly propped against the top end of the blowout preventing barrel is fixedly arranged outside the lower side of the flexible pipe through threads; or/and a lower tightening nut is fixedly arranged on a lower pressing ring at the lower end of the blowout prevention barrel through threads.
The packing seal assembly can comprise a lower base box body, an upper box body and a pressing block; a counter bore with an upward opening is arranged in the upper part of the lower box body of the base, the upper end of the lower box body of the base is fixedly connected with an upper box body, a through hole corresponding to the counter bore is arranged in the upper box body, a packing groove is formed between the through hole and the counter bore, and a pressing block capable of tightly pressing and fixing a packing in the packing groove is fixedly arranged in the upper part of the through hole; a lubricating and emptying channel which is communicated up and down is arranged in the base of the lower box body, and a radial agent injection hole which is communicated with the lubricating and emptying channel is arranged on the lower box body of the base; the upper end of the flexible pipe is fixedly arranged in the lower side of the box body under the base.
Copper sleeves capable of centering the polish rods can be respectively arranged at the bottoms of the counter bores of the lower box body of the base, packing bearing grooves can be arranged at the upper ends of the copper sleeves, and the packing bearing grooves are flat-bottom conical grooves with wide upper parts and narrow lower parts; copper pads capable of centering the polish rod are respectively fixed at the lower ends of the pressing blocks; or/and at least one handle sleeve with an outward opening is fixedly arranged on the outer circumference of the middle part of the upper box body; the handle sleeves are respectively provided with a handle rod which can be disassembled and assembled.
A lubricating oil nozzle can be fixedly arranged at the position of the agent injection hole; or, an emptying valve is fixedly arranged at the agent injection hole; or the outer port of the injection hole is provided with an internal thread, the injection emptying nozzle is fixedly installed with an injection emptying nozzle through a thread, a horizontal channel communicated with the injection hole is arranged in the injection emptying nozzle, the injection emptying nozzle at the right part of the horizontal channel is provided with a side hole, and a plug capable of plugging the side hole is fixedly installed in the right part of the horizontal channel through a thread.
The above may also include a polish rod; the upper end of the polish rod is a sticking section, the polish rod on the lower side of the sticking section is a spray welding section, and the packing seal assembly, the flexible pipe and the seal assembly are arranged outside the spray welding section of the polish rod; a pier thick rod head is fixed at the lower end of the spray welding section; and the outside of the polished rod and the outside of the upset rod head of the spray welding section are provided with spray welding layers.
An arc transition section can be arranged between the top end of the pier thick rod head and the polished rod, and the cylindricity of the arc transition section is 0.01-0.03; the coaxiality of the arc transition section is 0.01-0.03; the surface roughness of the circular arc transition section is 0.4 to 6.3.
The high-temperature and high-pressure resistant sealing element can be a sealing ring made of polyphenyl, a sealing ring made of polytetrafluoroethylene or a sealing ring made of graphite; or/and an outer protecting pipe is fixedly arranged on the packing seal assembly outside the flexible pipe at intervals, a limiting ring platform is arranged in the lower end of the outer protecting pipe, and the limiting ring platform is positioned right above the secondary seal assembly; and a flexible pipe compression space is formed between the lower end of the limiting ring table and the top end of the secondary sealing assembly.
The invention has reasonable and compact structure and convenient use; the blowout prevention barrel is connected to the packing seal assembly through the flexible pipe, so that the blowout prevention barrel can move along with the deviation of the oil pumping polished rod, and the condition that the polished rod and a sealing element are eccentrically worn is avoided; meanwhile, the high-temperature and high-pressure resistant sealing ring can be used for a long time in a high-temperature and high-pressure environment for steam injection, so that puncture and leakage are avoided, and effective sealing is guaranteed; in addition, the sealing device also has the advantages that the packing is convenient to replace, self-lubricating is realized, and the downhole pressure is prejudged; the polished rod surface spray welding improves the dynamic sealing performance of the packing seal assembly with the wellhead.
Drawings
FIG. 1 is a schematic cross-sectional view of a preferred embodiment of the present invention.
The codes in the figures are respectively: the flexible pipe is 1, the blowout preventer is 2, the flexible sealing ring is 3, the horizontal channel is 4, the upper pressing ring is 5, the lower pressing ring is 6, the frustum is 7, the support ring is 8, the arc transition section is 9, the upset rod head is 10, the upper backup nut is 11, the lower backup nut is 12, the backup ring is 13, the outer protective pipe is 14, the limit ring platform is 15, the lower base box body is 16, the upper box body is 17, the pressing block is 18, the lubricating emptying channel is 19, the injection hole is 20, the handle sleeve is 21, the copper sleeve is 22, the copper pad is 23, the injection emptying nozzles are 24 and 25 respectively used as plugs, the side hole is 26, the clamping section is 27, the spray welding section is 28, and the handle rod 29 is 34.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
In the present invention, for convenience of description, the description of the relative positional relationship of the components is described according to the layout pattern of fig. 1 of the specification, such as: the positional relationship of up, down, left, right, etc. is determined in accordance with the layout direction of fig. 1 in the specification.
The invention is further described with reference to the following examples and figures:
as shown in the attached figure 1, the wellhead steam injection puncture-proof sealing device comprises a packing sealing assembly, a flexible pipe 1 and a secondary sealing assembly; the lower end of the packing seal assembly is connected with a secondary seal assembly through a flexible pipe 1; the secondary seal assembly comprises a blowout preventer barrel 2 and a seal; the lower end of the flexible pipe 1 is fixedly installed with the upper end of the blowout preventer 2, at least one sealing element is arranged in the blowout preventer 2, and the sealing element is a high-temperature and high-pressure resistant sealing element. When the packing and blowout preventing device is used, a polish rod penetrates into the packing seal assembly, the flexible pipe 1 and the blowout preventing cylinder 2 from top to bottom, and a high-temperature and high-pressure resistant sealing element in the blowout preventing cylinder 2 can seal the polish rod; because the blowout prevention barrel 2 is connected to the packing seal assembly through the flexible pipe 1, the blowout prevention barrel 2 can move along with the deviation of the polished rod, the eccentric wear of the polished rod and a sealing element can not occur, the sealing effect of the high-temperature and high-pressure resistant sealing element is improved, the blowout prevention barrel can be used in a high-temperature and high-pressure environment of steam injection for a long time, the puncture is avoided, and the effective sealing is ensured.
According to actual needs, the wellhead steam injection anti-puncture sealing device can be further optimized or/and improved:
as shown in the attached figure 1, the high-temperature and high-pressure resistant sealing element is an inverted L-shaped flexible sealing ring 3 with the cross section of the inverted L-shaped flexible sealing ring, and the opening of the flexible sealing ring faces the outer side of the lower part; the lower end of the vertical section of the flexible sealing ring is inclined inwards to form a frustum 7; threads are arranged in the lower side of the blowout preventing barrel 2, a lower pressing ring 6 is fixedly installed on the lower side of the blowout preventing barrel 2 through the threads, at least one flexible sealing ring 3 is sequentially and fixedly installed in the blowout preventing barrel 2 at the upper end of the lower pressing ring 6 from bottom to top at intervals, and a supporting ring 8 is installed in the blowout preventing barrel 2 between every two adjacent flexible sealing rings 3; the cross section of the support ring 8 is L-shaped, and the support ring 8 and the flexible sealing ring 3 at the upper end of the support ring are mutually buckled and installed together; a conical clamping groove corresponding to the frustum 7 is formed in the upper end of the horizontal section of the support ring 8, and the frustum 7 is clamped in the conical clamping groove; threads are arranged in the upper side of the blowout prevention barrel 2, and an upper clamp ring 5 capable of pressing the flexible seal ring 3 and the support ring 8 downwards on the lower clamp ring 6 is fixedly installed through the threads. The upper compression ring 5 and the lower compression ring 6 can compress and fix the flexible sealing ring 3 in the blowout prevention barrel 2, so that the sealing effect of the flexible sealing ring 3 can be further improved, and leakage is avoided; the support ring 8 can improve the rigidity of the secondary sealing assembly; the flexible sealing ring 3 is supported, so that the flexible sealing ring 3 is convenient to disassemble and assemble; wherein, the tapered clamping groove of the support ring 8 is used for installing and positioning the flexible sealing ring 3.
As shown in the attached figure 1, the upper side of the flexible pipe 1 is provided with external threads, and the upper side of the flexible pipe 1 is fixedly installed with a packing seal assembly through the threads; the lower side of the flexible pipe 1 is provided with external threads, and the lower side of the flexible pipe 1 is fixedly installed with the blowout preventer 2 through threads; an upper tightening nut 11 which can be tightly propped against the top end of the blowout preventer 2 is fixedly arranged outside the lower side of the flexible pipe 1 through threads; the flexible pipe 1 is connected by the screw thread, so that the sealing of the flexible pipe 1 can be ensured, and the flexible pipe 1 is convenient to disassemble and assemble; and/or a lower backup nut 12 is fixedly arranged on the lower pressing ring 6 at the lower end of the blowout preventer 2 through threads. The upper tightening nut 11 and the lower tightening nut 12 respectively play a role in preventing loosening of threads.
As shown in the attached figure 1, the packing seal assembly comprises a lower base box body 16, an upper box body 17 and a pressing block 18; a counter bore with an upward opening is arranged in the upper part of the lower box body 16 of the base, the upper end of the lower box body 16 of the base is fixedly connected with an upper box body 17, a through hole corresponding to the counter bore is arranged in the upper box body 17, a packing groove is formed between the through hole and the counter bore, and a pressing block 18 capable of pressing and fixing a packing in the packing groove is fixedly arranged in the upper part of the through hole; a lubricating emptying channel 19 which is communicated up and down is arranged in the base of the lower box body, and a radial agent injection hole 20 communicated with the lubricating emptying channel 19 is arranged on the lower box body 16 of the base; the upper end of the flexible pipe 1 is fixedly arranged in the lower side of the base lower box body 16. When the packing is replaced by using the packing seal assembly, the lower base box body 16, the upper base box body 17 and the pressing block 18 can be detached respectively, and then the old packing is taken out and the new packing is replaced, so that time and labor are saved; particularly, after the depth of the counter bore of the disassembled lower box body becomes obviously shallow, not only is the cleaning of the old packing facilitated, but also the coiling installation of the new packing facilitated, and the labor intensity of packing replacement is reduced; a lubricating nozzle can be arranged at the position of the agent injection hole 20 to realize the effect of oil injection and lubrication; or an emptying valve is arranged at the position of the agent injection hole 20 to prejudge the underground pressure and improve the safety.
As shown in fig. 1, copper sleeves 22 capable of centering the polish rod are respectively arranged at the bottom of the counter bores of the base lower box body 16; the copper sleeve 22 and the copper pad 23 not only play a role in assisting the centering of the polished rod, but also can protect the polished rod, and prevent the polished rod from directly contacting and rubbing with the unit component lower box body 21, the base lower box body 16, the pressing block 18 and the unit component pressing block 23; the upper end of the copper sleeve 22 is provided with a packing pressure-bearing groove which is a flat-bottom conical groove with a wide upper part and a narrow lower part; therefore, the packing can be increased to bear pressing force, and the sealing period of the packing is prolonged; copper pads 23 capable of centering the polish rod are respectively fixed at the lower ends of the pressing blocks 18.
As shown in fig. 1, at least one handle sleeve 21 with an outward opening is fixedly arranged on the outer circumference of the middle part of the upper box body 17; a handle lever 29 is detachably fixed to each handle cover 21. Torque can be applied to the upper box body 17, the unit assembly lower box body 21 and the unit assembly upper box body 22 by using the handle rod 29 to realize the tightening and loosening operation; handle bar 29 can be followed handle cover 21 and dismantled at ordinary times to reduce occupation space, reduce the radius of gyration of this seal box, it is better to field installation and operating space adaptability.
As shown in fig. 1, a lubricating nozzle is fixedly arranged at the agent injection hole 20; the lubricating nozzle is used for filling lubricating oil, and the underground pressure can be judged according to the condition of air flow sprayed out from the lubricating nozzle; or, the emptying valve is fixedly arranged at the position of the agent injection hole 20; or, the outer port of the injection hole 20 is provided with an internal thread, and is fixedly provided with an injection emptying nozzle 24 through a thread, the injection emptying nozzle 24 is internally provided with a horizontal channel 4 communicated with the injection hole 20, the injection emptying nozzle 24 at the right part of the horizontal channel 4 is provided with a side hole 26, and the right part of the horizontal channel 4 is fixedly provided with a plug 25 capable of plugging the side hole 26 through a thread; when the lubricating oil is emptied and injected, the lubricating oil is injected or deflated through the side hole 26; therefore, the plug 25 does not need to be taken down, the side hole 26 can be quickly tightened and closed through the plug 25, the problem that the side hole is difficult to close due to high pressure during air bleeding is solved, and the field safety is improved; in addition, the injection emptying nozzle 24 is connected by adopting a threaded connection, so that the sealing performance is further improved.
As shown in figure 1, also comprises a polish rod; the upper end of the polish rod is a sticking section 27, the polish rod on the lower side of the sticking section 27 is a spray welding section 28, and the packing seal assembly, the flexible pipe 1 and the seal assembly are arranged outside the spray welding section 28 of the polish rod; the lower end of the spray welding section 28 is fixed with a pier thick rod head 10; and a spray welding layer is arranged outside the polish rod of the spray welding section 28 and outside the upset rod head 10. When in use, the clipping section 27 of the polished rod is connected with the oil pumping unit by installing a polished rod clip; the lower end of the polish rod is connected with an oil pump plunger through a heading rod joint 10; the spray welding section 28 of the polish rod is in sealing contact with a packing of a wellhead to form dynamic seal; the spray welding layer is added on the spray welding section 28 of the polish rod, so that the surface of the polish rod can be prevented from being damaged, the smooth surface is kept, and the sealing is more ideal; the surface of the clamping section 27 of the polish rod is not subjected to spray welding, so that the polish rod clamp is reliably locked, and slipping accidents are prevented; the thickness of the spray welding layer is 0.2 mm to 0.4 mm, so that the protection of the outside of a polished rod of the spray welding section 28 and the upsetting rod head 10 can be further enhanced; the tolerance range of the outer diameter of the polished rod of the spray welding section 28 is-0.1 mm to 0 mm, the size is more accurate, the dynamic sealing performance of a packing seal assembly with a wellhead is improved, the use is more convenient, and the service life is prolonged.
As shown in the attached figure 1, an arc transition section 9 is arranged between the top end of the upsetting rod head 10 and the polished rod, and the cylindricity of the arc transition section 9 is 0.01-0.03; the coaxiality of the arc transition section 9 is 0.01-0.03; the surface roughness of the circular arc transition section 9 is 0.4 to 6.3. When in use, a sealing element is required to be arranged at the arc transition section 9 to seal a gap between the oil pump plunger and the polish rod; therefore, the cylindricity, the coaxiality and the surface roughness of the arc transition section 9 are further limited, namely the cylindricity of the arc transition section 9 is 0.01 to 0.03; the coaxiality of the arc transition section 9 is 0.01-0.03; the surface roughness of the arc transition section 9 is 0.4 to 6.3; therefore, effective sealing at the arc transition section 9 can be ensured, and the sealing effect between the oil pump plunger and the polish rod is improved.
As shown in the attached figure 1, the high-temperature and high-pressure resistant sealing element is a sealing ring made of p-polyphenyl material, a sealing ring made of polytetrafluoroethylene material or a sealing ring made of graphite material; sealing rings made of p-polyphenylacetylene, teflon or graphite are known in the art.
As shown in the attached drawing 1, an outer protecting pipe 14 is fixedly installed on the packing seal assembly outside the flexible pipe 1 at intervals, a limit ring platform 15 is arranged in the lower end of the outer protecting pipe 14, and the limit ring platform 15 is positioned right above the secondary seal assembly; and a compression space of the flexible pipe 1 is formed between the lower end of the limit ring platform 15 and the top end of the secondary sealing assembly. When the polish rod moves upwards, the friction force can be resisted, and the flexible pipe 1 is protected from being compressed excessively.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (11)
1. A kind of well head injects the vapour and defends the sealing means of the puncture, characterized by including packing seal assembly, flexible pipe and second seal assembly; the lower end of the packing seal assembly is connected with a secondary seal assembly through a flexible pipe; the secondary seal assembly comprises a blowout preventer barrel and a seal; the lower end of the flexible pipe is fixedly installed with the upper end of the blowout preventing barrel, at least one sealing element is arranged in the blowout preventing barrel, the sealing element is a high-temperature and high-pressure resistant sealing element, the cross section of the high-temperature and high-pressure resistant sealing element is an inverted L-shaped flexible sealing ring with an opening facing the outer side of the lower part, and the lower end of the vertical section of the flexible sealing ring inclines inwards to form a frustum; threads are arranged in the lower side of the blowout prevention barrel, a lower compression ring is fixedly installed on the lower compression ring through the threads, at least one flexible sealing ring is fixedly installed in the blowout prevention barrel at the upper end of the lower compression ring at intervals from bottom to top in sequence, and a support ring is installed in the blowout prevention barrel between the adjacent flexible sealing rings; the cross section of the support ring is L-shaped, and the support ring and the flexible sealing ring at the upper end of the support ring are mutually buckled and installed together; the upper end of the horizontal section of the support ring is provided with a conical clamping groove corresponding to the frustum, and the frustum is clamped in the conical clamping groove; threads are arranged in the upper side of the blowout prevention barrel, and an upper clamp ring capable of pressing the flexible seal ring and the support ring downwards on the lower clamp ring is fixedly installed through the threads.
2. The wellhead steam injection and puncture-proof sealing device according to claim 1, wherein the upper side of the flexible pipe is provided with external threads, and the upper side of the flexible pipe is fixedly installed with the packing seal assembly through the threads; the lower side of the flexible pipe is provided with external threads, and the lower side of the flexible pipe is fixedly installed with the blowout prevention barrel through threads; an upper tightening nut which can be tightly propped against the top end of the blowout preventing barrel is fixedly arranged outside the lower side of the flexible pipe through threads; or/and a lower tightening nut is fixedly arranged on a lower pressing ring at the lower end of the blowout preventing barrel through threads.
3. The wellhead steam injection puncture-proof sealing device according to claim 1 or 2, characterized in that the packing seal assembly comprises a base lower box body, an upper box body and a pressing block; a counter bore with an upward opening is formed in the upper part of the lower box body of the base, the upper end of the lower box body of the base is fixedly connected with an upper box body, a through hole corresponding to the counter bore is formed in the upper box body, a packing groove is formed between the through hole and the counter bore, and a pressing block capable of tightly pressing and fixing a packing in the packing groove is fixedly arranged in the upper part of the through hole; a lubricating emptying channel which is communicated up and down is arranged in the base of the lower box body, and a radial agent injection hole communicated with the lubricating emptying channel is arranged on the lower box body of the base; the upper end of the flexible pipe is fixedly arranged in the lower side of the box body under the base.
4. A wellhead steam injection anti-puncture sealing device according to claim 3, characterized in that copper sleeves capable of centering a polish rod are respectively arranged in the bottom of counter bores of a lower box body of a base, a packing bearing groove is arranged at the upper end of each copper sleeve, and each packing bearing groove is a flat-bottom conical groove with a wide upper part and a narrow lower part; copper pads capable of centering the polish rod are respectively fixed at the lower ends of the pressing blocks; or/and at least one handle sleeve with an outward opening is fixedly arranged on the outer circumference of the middle part of the upper box body; the handle sleeves are respectively provided with a handle rod which can be disassembled and assembled.
5. A wellhead steam injection puncture-proof sealing device according to claim 4, characterized in that a lubricating oil nozzle is fixedly arranged at the injection agent hole; or, an emptying valve is fixedly arranged at the position of the agent injection hole; or the outer port of the injection hole is provided with an internal thread, the injection emptying nozzle is fixedly installed with an injection emptying nozzle through a thread, a horizontal channel communicated with the injection hole is arranged in the injection emptying nozzle, the injection emptying nozzle at the right part of the horizontal channel is provided with a side hole, and a plug capable of plugging the side hole is fixedly installed in the right part of the horizontal channel through a thread.
6. A wellhead steam injection anti-puncture sealing device according to claim 1, 2, 4 or 5, characterized by further comprising a polish rod; the upper end of the polish rod is a punch-clamping section, the polish rod on the lower side of the punch-clamping section is a spray welding section, and the packing seal assembly, the flexible pipe and the seal assembly are arranged outside the spray welding section of the polish rod; a pier thick rod head is fixed at the lower end of the spray welding section; and the outside of the polished rod and the outside of the upset rod head of the spray welding section are provided with spray welding layers.
7. A wellhead steam injection puncture-proof sealing device according to claim 3, characterized by further comprising a polish rod; the upper end of the polish rod is a sticking section, the polish rod on the lower side of the sticking section is a spray welding section, and the packing seal assembly, the flexible pipe and the seal assembly are arranged outside the spray welding section of the polish rod; a pier thick rod head is fixed at the lower end of the spray welding section; and the outside of the polished rod and the outside of the upset rod head of the spray welding section are provided with spray welding layers.
8. A wellhead steam injection puncture-proof sealing device according to claim 7, characterized in that an arc transition section is arranged between the top end of the upsetting rod head and the polish rod, and the cylindricity of the arc transition section is 0.01 to 0.03; the coaxiality of the arc transition section is 0.01-0.03; the surface roughness of the circular arc transition section is 0.4 to 6.3.
9. A wellhead steam injection puncture-proof sealing device according to claim 1, 2, 4, 5, 7 or 8, characterized in that the high temperature and high pressure resistant sealing element is a sealing ring made of polyphenyl, polytetrafluoroethylene or graphite; or/and an outer protecting pipe is fixedly arranged on the packing seal assembly outside the flexible pipe at intervals, a limiting ring table is arranged in the lower end of the outer protecting pipe, and the limiting ring table is positioned right above the secondary seal assembly; and a flexible pipe compression space is formed between the lower end of the limiting ring table and the top end of the secondary sealing assembly.
10. A wellhead steam injection and puncture-proof sealing device according to claim 3, wherein the high-temperature and high-pressure resistant sealing element is a sealing ring made of polyphenyl, polytetrafluoroethylene or graphite; or/and an outer protecting pipe is fixedly arranged on the packing seal assembly outside the flexible pipe at intervals, a limiting ring platform is arranged in the lower end of the outer protecting pipe, and the limiting ring platform is positioned right above the secondary seal assembly; and a flexible pipe compression space is formed between the lower end of the limiting ring table and the top end of the secondary sealing assembly.
11. A wellhead steam injection puncture-proof sealing device according to claim 6, characterized in that the high temperature and high pressure resistant sealing element is a sealing ring made of p-polyphenyl material, a sealing ring made of polytetrafluoroethylene material or a sealing ring made of graphite material; or/and an outer protecting pipe is fixedly arranged on the packing seal assembly outside the flexible pipe at intervals, a limiting ring table is arranged in the lower end of the outer protecting pipe, and the limiting ring table is positioned right above the secondary seal assembly; and a flexible pipe compression space is formed between the lower end of the limiting ring table and the top end of the secondary sealing assembly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016599.1A CN106639958B (en) | 2017-01-10 | 2017-01-10 | Wellhead steam injection puncture-proof sealing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710016599.1A CN106639958B (en) | 2017-01-10 | 2017-01-10 | Wellhead steam injection puncture-proof sealing device |
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| CN106639958A CN106639958A (en) | 2017-05-10 |
| CN106639958B true CN106639958B (en) | 2023-04-07 |
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| CN201710016599.1A Active CN106639958B (en) | 2017-01-10 | 2017-01-10 | Wellhead steam injection puncture-proof sealing device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109322636A (en) * | 2017-07-31 | 2019-02-12 | 克拉玛依胜利高原机械有限公司 | A kind of oil field shaft mouth blowout hookup |
| CN109184582B (en) * | 2018-09-17 | 2023-09-08 | 克拉玛依胜利高原机械有限公司 | Split polish rod, polish rod replaceable assembly and polish rod replacement process |
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