CN113530488A - Packing sealing system in shaft of ultra-long stroke oil pumping machine - Google Patents
Packing sealing system in shaft of ultra-long stroke oil pumping machine Download PDFInfo
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- CN113530488A CN113530488A CN202010321877.6A CN202010321877A CN113530488A CN 113530488 A CN113530488 A CN 113530488A CN 202010321877 A CN202010321877 A CN 202010321877A CN 113530488 A CN113530488 A CN 113530488A
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- 238000012856 packing Methods 0.000 title claims abstract description 141
- 238000005086 pumping Methods 0.000 title claims abstract description 48
- 238000007789 sealing Methods 0.000 title claims abstract description 44
- 239000000725 suspension Substances 0.000 claims abstract description 41
- 239000003129 oil well Substances 0.000 claims abstract description 23
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000011084 recovery Methods 0.000 abstract 1
- 230000003139 buffering effect Effects 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 241000191291 Abies alba Species 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 244000147058 Derris elliptica Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000002035 prolonged effect Effects 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
- F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
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- Mining & Mineral Resources (AREA)
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Abstract
The utility model provides a packing sealing system in overlength stroke beam-pumping unit pit shaft belongs to oil development technical field. The device comprises a winch, a wellhead device and an underground packing device; a suspension rope is wound on the winch, the first end of the suspension rope is fixed on the winch, and the second end of the suspension rope penetrates through the wellhead device and is positioned in the underground packing device; the wellhead device is positioned at the top of the underground packing device; the packing device in pit includes oil pipe in the pit, packing box and rigidity polished rod in the pit, oil pipe's top is located the bottom of wellhead assembly in the pit, packing box in the pit connects on oil pipe in the pit, the rigidity polished rod passes packing box in the pit, and sealed cooperation between rigidity polished rod and the packing box in the pit, the top of rigidity polished rod and the second end of hanging rope link together, the bottom of rigidity polished rod links together with the pump rod of oil-well pump, the oil-well pump is located oil pipe's in the pit bottom, the oil-well pump communicates with wellhead assembly through oil pipe in the pit. The present disclosure facilitates control of oil recovery costs.
Description
Technical Field
The utility model belongs to the technical field of oil development, in particular to packing sealing system in overlength stroke beam-pumping unit pit shaft.
Background
The ultra-long stroke oil pumping system is a special oil pumping system, which is mainly applied to oil wells with pump depth over 2500 meters and wells with higher gas content (gas-oil ratio).
In the related art, because a common rigid polished rod is easy to break and difficult to retract when the length of the rigid polished rod is too long, a flexible polished rod is usually configured in an ultra-long stroke oil pumping system, extends out of a winch and penetrates through a packing box arranged at a wellhead until the flexible polished rod is connected with a pump rod in a well, so that the function of transmitting power is achieved. The main body of the flexible polished rod is composed of a plurality of steel wire ropes wound together, and a layer of resin material is covered outside the flexible polished rod to ensure the roundness and the smoothness of the flexible polished rod, thereby ensuring the sealing performance of the flexible polished rod and the packing box.
However, the thermal expansion and bending stress resistance of the resin material and the steel wire rope are different, and the binding property between the resin material and the steel wire rope is poor, so that the resin material is often stripped from the steel wire rope, the sealing property of the packing box is affected, the problem can be solved only by replacing the flexible polished rod, and the control of the oil exploitation cost is affected.
Disclosure of Invention
The embodiment of the disclosure provides a packing sealing system in a shaft of an ultra-long stroke pumping unit, which is beneficial to controlling the cost of oil exploitation. The technical scheme is as follows:
the embodiment of the disclosure provides a packing sealing system in a shaft of an ultra-long stroke pumping unit, which comprises a winch, a wellhead device and an underground packing device;
a suspension rope is wound on the winch, the first end of the suspension rope is fixed on the winch, and the second end of the suspension rope penetrates through the wellhead device and is positioned in the underground packing device;
the wellhead device is positioned at the top of the downhole packing device;
the packing device in pit includes oil pipe, packing box and rigidity polished rod in the pit, oil pipe's top in the pit is located the bottom of wellhead assembly, packing box in the pit is located on the oil pipe in the pit, the rigidity polished rod passes packing box in the pit, just the rigidity polished rod with sealed cooperation between the packing box in the pit, the top of rigidity polished rod with the second end of hanging rope links together, the bottom of rigidity polished rod is passed through the pump rod and is connected with the oil-well pump transmission, the oil-well pump is located oil pipe's bottom in the pit, the oil-well pump passes through oil pipe in the pit with wellhead assembly intercommunication.
Optionally, the downhole oil pipe comprises a casing and a first oil pipe, the casing and the top of the first oil pipe are both located below the wellhead device, the first oil pipe is located in the casing, the downhole packing box is located in the first oil pipe, and the outer wall of the downhole packing box is in sealing fit with the inner wall of the first oil pipe.
Optionally, a first sieve tube is arranged at a position, below the downhole packing box, on the first oil pipe, the downhole packing device further comprises a packer, the packer is located between the first oil pipe and the casing, the packer separates an annular space between the first oil pipe and the casing into an upper annular space and a lower annular space, and the oil well pump is communicated with the wellhead device sequentially through the first oil pipe, the first sieve tube and the upper annular space.
Optionally, the downhole oil pipe comprises a sleeve, a second oil pipe and a third oil pipe, the sleeve, the second oil pipe and the top of the third oil pipe are both located below the wellhead device, the second oil pipe is located in the sleeve, the third oil pipe is located in the second oil pipe, the downhole packing box is located in the third oil pipe, and the outer wall of the downhole packing box is in sealing fit with the inner wall of the third oil pipe.
Optionally, a second sieve tube is arranged at a position, below the downhole packing box, on the third oil pipe, the downhole packing device further comprises a setting sealer, the setting sealer is arranged between the second oil pipe and the third oil pipe, an oil conveying annulus is formed between the setting sealer and the second oil pipe and between the setting sealer and the third oil pipe, and the oil well pump is communicated with the wellhead device sequentially through the second oil pipe, the second sieve tube and the oil conveying annulus.
Optionally, the rigid polished rod and the suspension rope are connected together through a rope hanger.
Optionally, the rigid polished rod and the pump rod are connected together by a screw thread.
Optionally, the bottom of the pump has a bell mouth.
Optionally, the wellhead assembly includes a closure plate located on the wellhead, the suspension rope passing through the closure plate.
Optionally, the packing sealing system in the ultra-long stroke pumping unit shaft further comprises a buffering and centering wheel, the buffering and centering wheel is located above the wellhead device, the suspension rope is wound on the buffering and centering wheel, and a tangent between the suspension rope and the buffering and centering wheel coincides with an axis of the rigid polished rod.
The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:
when carrying out oil exploitation through the coiled root sealing system in the super long stroke beam-pumping unit pit shaft that this disclosure provided, the winch is through the first end of convoluteing the polished rod to second end through the polished rod drives the rigidity polished rod and is axial motion in the pit, thereby drives the pump rod and is axial motion, and then makes the oil-well pump pass through the oil pipe pump sending to ground in with the oil in the oil reservoir in the pit. Because the packing box in the pit is located a definite position below the well head, and the part is connected with the winch by the polished rod in the pit of aboveground part and part, so the overlength that the length of rigid polished rod can be done as required, when having avoided the rupture risk, still does not have the problem that resin material peeled off in the flexible polished rod to and sealed inefficacy leads to the well head to reveal the problem of polluted environment. Because the rigid polished rod has a longer service life and can ensure long-time sealing fit between the rigid polished rod and the underground packing box, the rigid polished rod can be used for a long time and is beneficial to controlling the petroleum exploitation cost.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a packing seal system in a shaft of an ultra-long stroke pumping unit provided in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a downhole packing apparatus according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another downhole packing apparatus provided in an embodiment of the present disclosure.
The symbols in the drawings represent the following meanings:
1. a winch; 11. a base; 12. a motor; 13. a reel; 2. a wellhead assembly; 21. closing the plate; 3. an underground packing device; 31. a downhole tubing; 311. a sleeve; 312. a first oil pipe; 313. a first sieve tube; 314. a bell mouth; 315. a sleeve; 316. a second oil pipe; 317. a third oil pipe; 318. a second sieve tube; 32. an underground packing box; 33. a rigid polish rod; 34. an oil well pump; 341. a pump rod; 342. a pump barrel; 343. a pump plunger; 35. a packer; 36. setting a sealer; 4. a suspension rope; 5. a buffer righting wheel; 6. a rope hanger; 100. an underground oil layer; a. an upper annulus; b. a lower annulus; c. oil transportation annular space.
Detailed Description
To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
The embodiment of the disclosure provides a packing sealing system in a shaft of an ultra-long stroke pumping unit, and the packing sealing system in the shaft of the ultra-long stroke pumping unit belongs to an ultra-long stroke pumping system. Fig. 1 is a schematic structural diagram of the packing sealing system in the shaft of the ultra-long stroke pumping unit, and with reference to fig. 1, the packing sealing system in the shaft of the ultra-long stroke pumping unit comprises a winch 1, a wellhead device 2 and a downhole packing device 3. The winch 1 and the wellhead device 2 are matched equipment of the underground packing device 3.
In this embodiment, a suspension rope 4 is wound on the winch 1, a first end of the suspension rope 4 is fixed on the winch 1, and a second end of the suspension rope 4 passes through the wellhead assembly 2 and is located in the downhole packing assembly 3.
The wellhead 2 is located on top of the downhole packing 3.
Fig. 2 is a schematic structural diagram of a downhole packing device provided in an embodiment of the present disclosure, with reference to fig. 2, in this embodiment, the downhole packing device 3 includes a downhole oil pipe 31, a downhole packing box 32, and a rigid polished rod 33, a top of the downhole oil pipe 31 is located at a bottom of the wellhead 2, the downhole packing box 32 is located on the downhole oil pipe 31, the rigid polished rod 33 passes through the downhole packing box 32, and the rigid polished rod 33 and the downhole packing box 32 are in sealing fit, a top of the rigid polished rod 33 is connected with a second end of the suspension rope 4, a bottom of the rigid polished rod 33 is connected with a pump rod 341 of the oil pump 34, the oil pump 34 is located at the bottom of the downhole oil pipe 31, and the oil pump 34 is communicated with the wellhead 2 through the downhole oil pipe 31.
When carrying out oil exploitation through the coiled root sealing system in the super long stroke beam-pumping unit pit shaft that this disclosure provided, winch 1 is through the first end of coiling polished rod 4 to second end through polished rod 4 drives rigidity polished rod 33 and is axial motion in the pit, thereby drives pump rod 341 and is axial motion, and then makes oil-well pump 34 with the oil in the oil reservoir 100 in the pit through oil pipe 31 pump sending to wellhead assembly 2 in the pit. Because the packing box 32 is located at a certain position below the wellhead, and the part above the well and the part below the well are connected with the winch 1 by the suspension ropes 4, the length of the rigid polished rod 33 can be overlong as required, so that the risk of breakage is avoided, and meanwhile, the problem of stripping of resin materials in the flexible polished rod and the problem of environment pollution caused by wellhead leakage due to sealing failure do not exist. Because the rigid polished rod 33 has a long service life and can ensure long-time sealing fit between the rigid polished rod and the underground packing box 32, the rigid polished rod can be used for a long time and is beneficial to controlling the oil exploitation cost.
In addition, the frequent replacement of the underground packing devices 3 such as the rigid polished rod 33 is reduced, so that the pollution generated during operation is avoided, and the oil yield of the oil well is improved.
Referring again to fig. 1, in this embodiment, the winch 1 is located at the surface. The winch 1 comprises a base 11, a motor 12 and a winding drum 13, wherein the base 11 is fixed on the bottom surface, the motor 12 and the winding drum 13 are both positioned on the base 11, an output shaft of the motor 12 is in transmission connection with the winding drum 13 through a cross spline, and the first end of the suspension rope 4 is fixed and wound on the winding drum 13.
In the above implementation, the motor 12 powers the drum 13 such that the drum 13 can rotate to effect the pay out and retraction of the suspension ropes 4.
Optionally, the suspension rope 4 may be a high-strength steel wire rope to ensure its reliability, and to improve the service life of the suspension rope 4, which is beneficial to the cost control of oil exploitation.
In this embodiment, the packing sealing system in the shaft of the ultra-long stroke pumping unit further comprises a buffering and centering wheel 5, the buffering and centering wheel 5 is located above the wellhead device 2, the suspension rope 4 is wound on the buffering and centering wheel 5, and a tangent line between the suspension rope 4 and the buffering and centering wheel 5 coincides with the axis of the rigid polished rod 33.
In the above implementation, the suspension rope 4 extends out of the winch 1 and extends into the underground after bypassing the buffering and centralizing wheel 5. That is to say, can change the direction of pulling of polished rod 4 through buffering righting wheel 5, can realize polished rod 4 and the coincidence of the axis of rigidity polished rod 33 to rigidity polished rod 33 can be better promoted, transferred, avoided because of polished rod 4 and rigidity polished rod 33 skew, and lead to wearing and tearing.
In this embodiment the wellhead 2 includes a closure plate 21, the closure plate 21 being located on the wellhead and the suspension ropes 4 being located in the closure plate 21.
In the above implementation, the closing plate 21 is fixedly installed at the wellhead for preventing sundries from falling into the well.
Illustratively, the inner diameter of the inner hole of the closing plate 21 may be slightly larger than the outer diameter of the suspension wire 4, so as to ensure that the suspension wire 4 can smoothly pass through the closing plate 21 and move. In addition, abrasion between the suspension rope 4 and the closing plate 21 can be avoided, and the service life of the suspension rope 4 is further ensured.
Of course, the inner diameter of the inner hole of the closing plate 21 can be adjusted according to the outer diameter of the suspension rope 4 and the actual requirement, which is not limited by the present disclosure.
In the above implementation, the oil pumped by the pump 34 directly flows to the christmas tree through the downhole tubing 31, and can be output through the christmas tree.
Referring again to fig. 2, in this embodiment, rigid polished rod 33 may be a high strength metal piece to further improve the reliability and service life of rigid polished rod 33 to facilitate control of oil production costs.
In addition, the rigid polished rod 33 is designed to be a high-strength metal piece, so that the roughness of the outer wall surface of the rigid polished rod 33 can be well controlled, the abrasion between the rigid polished rod 33 and the downhole packing box 32 is reduced, and the service life between the rigid polished rod 33 and the downhole packing box 32 is further prolonged.
Optionally, the rigid polished rod 33 and the polished rod 4 are connected together by the polished rod eye 6.
In above-mentioned implementation, connect the second end of polished rod 4 and the top of rigidity polished rod 33 through polished rod eye 6, the dismouting between realization rigidity polished rod 33 and the polished rod 4 that can be comparatively convenient to the polished rod 4 of different specifications of quick change, with the suitability of realizing the interior root of a plate sealing system of overlength stroke beam-pumping unit pit shaft.
Alternatively, the rigid body 33 and the pump rod 341 are threaded together.
With continued reference to FIG. 2, in this embodiment, the downhole tubing 31 includes a casing 311 and a first tubing 312, the top of the casing 311 and the first tubing 312 are both located at the bottom of the wellhead 2, the first tubing 312 is located within the casing 311, the downhole packing box 32 is located within the first tubing 312, and the outer wall of the downhole packing box 32 is in sealing engagement with the inner wall of the first tubing 312.
In the above implementation manner, the casing 311 is located downhole to play a role of fixing a well wall, and the working stability of the packing sealing system in the shaft of the ultra-long stroke pumping unit is ensured. The first tubing 312 functions to provide a mounting base for the downhole packing box 32 and the like. The downhole packing box 32 seals the first tubing 312 to prevent oil from leaking directly from the first tubing 312.
Illustratively, first tubing 312 is suspended at the bottom of wellhead 2 so as to communicate with the tree of wellhead 2, enabling pumping of oil.
And, first tubing 312 and casing 311 are coaxially disposed therebetween.
Optionally, the first tubing 312 and the downhole packing box 32 are threadably connected.
In this way, a removable connection between the first tubing 312 and the downhole packing box 32 may be achieved.
It is readily appreciated that while the present disclosure provides a packing system in a well bore for an ultra-long stroke pumping unit that improves the service life of the downhole packing box 32, as the service life increases, the downhole packing box 32 inevitably needs to be replaced. At this moment, just can utilize the screw thread to dismantle packing box 32 in the pit from first oil pipe 312 through oil well workover, through changing packing box 32 in the pit, can realize the continuation normal work of packing sealing system in the overlength stroke beam-pumping unit pit shaft. In addition, since the downhole packing box 32 needs to match the specification of the rigid polished rod 33, the corresponding downhole packing box 32 needs to be replaced if the rigid polished rod 33 needs to be replaced.
Optionally, the first tubing 312 is provided with a first sieve tube 313 at a position below the downhole packing box 32, the downhole packing device 3 further comprises a packer 35, the packer 35 is positioned between the first tubing 312 and the casing 311, the packer 35 divides an annulus between the first tubing 312 and the casing 311 into an upper annulus a and a lower annulus b, and the oil well pump 34 is communicated with the wellhead 2 through the first tubing 312, the first sieve tube 313 and the upper annulus a in sequence.
In the above implementation, the first screen 313 functions primarily to communicate the first oil pipe 312 with the upper annulus a, providing a passage for oil to circulate. In addition, the first screen 313 may also function as a sand control screen to filter sand carried in the oil.
Illustratively, the first screen 313 provided by embodiments of the present disclosure may be a drilled screen.
It will be readily appreciated that in other embodiments, other types of screens may be selected according to actual needs, and the present disclosure is not limited thereto.
The pumping process of oil is briefly described as follows:
the oil pump 34 pumps the oil in the downhole oil layer 100 to the first oil pipe 312, the oil flows upwards along the bottom of the first oil pipe 312 to the first screen pipe 313, the oil flows into the upper annulus a through the first screen pipe 313 because the downhole packing box 32 is arranged above the first screen pipe 313, the oil in the upper annulus a continues to flow upwards to the wellhead device 2 under the sealing action of the packer 35 and flows out through the Christmas tree in the wellhead device 2, so that the whole oil pumping process is completed.
Optionally, the first tubing 312 and the first screen 313 are threaded.
Therefore, the detachable connection between the first oil pipe 312 and the first sieve pipe 313 can be realized, so that the first sieve pipe 313 can be replaced, and the applicability of the packing sealing system in the shaft of the ultra-long stroke pumping unit is improved.
With continued reference to fig. 2, in the present embodiment, the pump 34 includes a pump cylinder 342 and a pump plunger 343, the top of the pump cylinder 342 communicates with the bottom of the first oil pipe 312, the bottom of the pump cylinder 342 communicates with the downhole oil layer 100, and the pump plunger 343 is located in the pump cylinder 342 and is driven by the pump rod 341.
Optionally, the bottom of the pump plunger 343 has a bell mouth 314, and the pump plunger 343 communicates with the downhole reservoir 100 through the bell mouth 314.
In the above implementation, the bell mouth 314 is located at the lowest end of the whole downhole packing device 3, and it mainly plays a role of marking so that an operator can judge whether the whole downhole packing device 3 is completely taken out from the downhole.
For example, when a workover rig trips out of the tubular string, it may be observed whether the flare 314 has been tripped out, and if the flare 314 has been tripped out, it indicates that all of the downhole packing 3 has been tripped out. On the other hand, if the bell mouth 314 is not seen, it indicates that some of the oil pipes and the like are dropped down the well, and the oil pipes and the like dropped down the well need to be salvaged by a salvage means so as to avoid affecting the normal production of the oil well.
Of course, in other embodiments, other components may be used for marking, such as a thread having a special shape for identification, and the like, and the disclosure is not limited thereto.
The operation of the packing system in a wellbore of an ultra-long stroke pumping unit having the downhole packing 3 of fig. 2 will now be briefly described:
when oil extraction is carried out through the packing sealing system in the ultra-long stroke oil pumping unit shaft, the winch 1 winds the first end of the suspension rope 4 to drive the rigid polished rod 33 to do axial movement in the well through the second end of the suspension rope 4, so as to drive the pump rod 341 to do axial movement, further the oil pump 34 enables oil in the underground oil layer 100 to flow upwards to the first sieve tube 313 through the bottom of the first oil pipe 312, because the underground packing box 32 is arranged above the first sieve tube 313, the oil flows into the upper annular space a through the first sieve tube 313, the oil in the upper annular space a continues to flow upwards to the wellhead device 2 under the sealing action of the packer 35, and flows out through the Christmas tree in the wellhead device 2, so as to finish the whole oil pumping process.
Because the packing box 32 is located at a certain position below the wellhead, and the part above the well and the part below the well are connected with the winch 1 by the suspension ropes 4, the length of the rigid polished rod 33 can be overlong as required, so that the risk of breakage is avoided, and meanwhile, the problem of stripping of resin materials in the flexible polished rod and the problem of environment pollution caused by wellhead leakage due to sealing failure do not exist. Because the rigid polished rod 33 has a long service life and can ensure the sealing fit between the rigid polished rod and the underground packing box 32, the rigid polished rod can be used for a long time and is beneficial to controlling the oil exploitation cost.
In addition, the frequent replacement of the underground packing devices 3 such as the rigid polished rod 33 is reduced, so that the pollution generated during operation is avoided, and the oil yield of the oil well is improved.
Fig. 3 is a schematic structural diagram of another downhole packing device 3 provided in the embodiment of the present disclosure, and with reference to fig. 3, in this embodiment, the downhole packing device 3 is also applicable to the packing system in the shaft of the ultra-long stroke pumping unit provided in the present disclosure, that is, when the downhole packing device is applied to the packing system in the shaft of the ultra-long stroke pumping unit, the winch 1 and the wellhead 2 which are matched with each other may be the same as those in fig. 1, so the assembly relationship and the beneficial effects are not described herein again.
Also, the difference between the downhole packing 3 of the alternative type shown in fig. 3 and the downhole packing 3 of the alternative type shown in fig. 2 is mainly the oil pumping path and the foundation for the installation of the downhole packing box 32. The rest parts are basically the same and are not described in detail herein.
Referring to FIG. 3, in the present embodiment, the downhole tubing 31 includes casing 315, second tubing 316 and third tubing 317, the top of the casing 315, the top of the second tubing 316 and the top of the third tubing 317 are located at the bottom of the wellhead 2, the second tubing 316 is located in the casing 315, the third tubing 317 is located in the second tubing 316, the downhole packing box 32 is located in the third tubing 317, and the outer wall of the downhole packing box 32 is in sealing engagement with the inner wall of the third tubing 317.
In the above implementation, the casing 315 is located downhole to play a role in fixing the well wall, and the working stability of the packing sealing system in the shaft of the ultra-long stroke pumping unit is ensured. The second oil pipe 316 is used to communicate with the pump 34 to provide a passage for pumping oil. The third tubing 317 functions to provide a mounting base for the downhole packing box 32 and the like. The downhole packing box 32 seals the third tubing 317 to prevent oil from leaking directly from the third tubing 317.
It should be noted that the structure of the sleeve 315 may be the same as that of the sleeve 311, and different reference numerals are used for convenience of distinction only. The manner in which the casing 315 and wellhead 2 are assembled may also be the same as the casing 311 and will not be described further herein.
And, the casing 315, the second oil pipe 316 and the third oil pipe 317 are coaxially arranged.
Optionally, the third tubing 317 and the downhole packing box 32 are threaded.
In this way, a removable connection between the third tubing 317 and the downhole packing box 32 may be achieved.
Optionally, a second screen pipe 318 is arranged on the third oil pipe 317 below the downhole packing box 32, the downhole packing device 3 further comprises a setting sealer 36, the setting sealer 36 is arranged between the second oil pipe 316 and the third oil pipe 317, an oil conveying annulus c is formed among the setting sealer 36, the second oil pipe 316 and the third oil pipe 317, and the oil well pump 34 is communicated with the wellhead device 2 sequentially through the second oil pipe 316, the second screen pipe 318 and the oil conveying annulus c.
In the above implementation, the second screen 318 serves primarily to communicate the second tubing 316 with the oil annulus c, providing a passage for oil to flow through.
It is to be understood that the optional variety of the second screen 318 may be the same as the optional variety of the first screen 313, and each may be selected according to actual needs, which is not limited by the disclosed embodiments.
The pumping process of oil is briefly described as follows:
the oil pump 34 pumps the oil in the downhole reservoir 100 to the second oil pipe 316, the oil flows up to the second sieve pipe 318 along the bottom of the second oil pipe 316, because the downhole packing box 32 is arranged above the second sieve pipe 318, the oil does not enter the third oil pipe 317, but flows into the oil conveying annulus c through the second sieve pipe 318, the oil in the oil conveying annulus c continues to flow up to the wellhead device 2 under the sealing action of the setting sealer 36, and flows out through the Christmas tree in the wellhead device 2, so as to complete the whole oil pumping process.
Optionally, a third tubing 317 and a second screen 318 are threaded.
In this way, the third oil pipe 317 and the second screen pipe 318 can be detachably connected, so that the second screen pipe 318 can be replaced, and the applicability of the packing sealing system in the shaft of the ultra-long stroke pumping unit is improved.
Similar to the downhole packing 3 shown in FIG. 2, the top of the pump barrel 342 of the pump 34 communicates with the bottom of the second tubing 316 to pump oil through the second tubing 316 to the wellhead 2.
The operation of the packing system in a wellbore of an ultra-long stroke pumping unit having the downhole packing 3 of fig. 3 will now be briefly described:
when oil is produced by the packing sealing system in the shaft of the ultra-long stroke pumping unit provided by the present disclosure, the winch 1 winds the first end of the suspension rope 4 to drive the rigid polished rod 33 to axially move in the well through the second end of the suspension rope 4, so as to drive the pump rod 341 to axially move, further the oil pump 34 enables the oil in the downhole oil layer 100 to flow upwards to the second sieve tube 318 along the bottom of the second oil tube 316, and because the downhole packing box 32 is arranged above the second sieve tube 318, the oil does not enter the third oil tube 317 but flows into the oil conveying annulus c through the second sieve tube 318, and the oil in the oil conveying annulus c continues to flow upwards to the wellhead device 2 under the sealing action of the setting sealer 36 and flows out through the oil tree in the wellhead device 2, so as to complete the whole oil pumping process.
Because the packing box 32 is located at a certain position below the wellhead, and the part above the well and the part below the well are connected with the winch 1 by the suspension ropes 4, the length of the rigid polished rod 33 can be overlong as required, so that the risk of breakage is avoided, and meanwhile, the problem of stripping of resin materials in the flexible polished rod and the problem of environment pollution caused by wellhead leakage due to sealing failure do not exist. Because the rigid polished rod 33 has a long service life and can ensure long-time sealing fit between the rigid polished rod and the underground packing box 32, the rigid polished rod can be used for a long time and is beneficial to controlling the oil exploitation cost.
In addition, the frequent replacement of the underground packing devices 3 such as the rigid polished rod 33 is reduced, so that the pollution generated during operation is avoided, and the oil yield of the oil well is improved.
The above description is meant to be illustrative of the principles of the present disclosure and not to be taken in a limiting sense, and any modifications, equivalents, improvements and the like that are within the spirit and scope of the present disclosure are intended to be included therein.
Claims (10)
1. A packing sealing system in a shaft of an ultra-long stroke pumping unit is characterized by comprising a winch (1), a wellhead device (2) and an underground packing device (3);
a suspension rope (4) is wound on the winch (1), the first end of the suspension rope (4) is fixed on the winch (1), and the second end of the suspension rope (4) penetrates through the wellhead device (2) and is positioned in the underground packing device (3);
the wellhead device (2) is positioned at the top of the underground packing device (3);
the downhole packing device (3) comprises a downhole oil pipe (31), a downhole packing box (32) and a rigid polished rod (33), the top of the downhole oil pipe (31) is located at the bottom of the wellhead device (2), the downhole packing box (32) is located on the downhole oil pipe (31), the rigid polished rod (33) penetrates through the downhole packing box (32), the rigid polished rod (33) and the downhole packing box (32) are in sealing fit, the top of the rigid polished rod (33) is connected with the second end of the suspension rope (4), the bottom of the rigid polished rod (33) is in transmission connection with an oil well pump (34) through a pump rod (341), the oil well pump (34) is located at the bottom of the downhole oil pipe (31), and the oil well pump (34) is communicated with the wellhead device (2) through the downhole oil pipe (31).
2. The system of claim 1, wherein the downhole tubing (31) comprises casing and first tubing (312), a top of the casing and the first tubing (312) are both located below the wellhead (2), the first tubing (312) is located within the casing, the downhole packing box (32) is located within the first tubing (312), and an outer wall of the downhole packing box (32) is in sealing engagement with an inner wall of the first tubing (312).
3. The packing seal system in a super long stroke pumping unit well bore according to claim 2, characterized in that a first screen (313) is provided on the first tubing (312) at a position below the downhole packing box (32), the downhole packing device (3) further comprises a packer (35), the packer (35) is positioned between the first tubing (312) and the casing, and the packer (35) divides an annulus between the first tubing (312) and the casing into an upper annulus (a) and a lower annulus (b), the pump (34) is communicated with the wellhead (2) sequentially through the first tubing (312), the first screen (313) and the upper annulus (a).
4. The system of claim 1, wherein the downhole tubing (31) comprises casing, second tubing (316), and third tubing (317), the top of the casing, the second tubing (316), and the third tubing (317) are each positioned below the wellhead (2), the second tubing (316) is positioned within the casing, the third tubing (317) is positioned within the second tubing (316), the downhole packing box (32) is positioned within the third tubing (317), and the outer wall of the downhole packing box (32) is in sealing engagement with the inner wall of the third tubing (317).
5. The packing seal system in a super long stroke pumping unit well bore according to claim 4, characterized in that a second screen pipe (318) is arranged on the third oil pipe (317) at a position below the downhole packing box (32), the downhole packing device (3) further comprises a setting sealer (36), the setting sealer (36) is arranged between the second oil pipe (316) and the third oil pipe (317), an oil conveying annulus (c) is formed among the setting sealer (36), the second oil pipe (316) and the third oil pipe (317), and the oil well pump (34) is communicated with the wellhead device (2) sequentially through the second oil pipe (316), the second screen pipe (318) and the oil conveying annulus (c).
6. The packing system in a very long stroke pumping unit well bore according to any of claims 1 to 5 wherein the rigid polished rod (33) and the pendant (4) are connected together by a pendant (6).
7. The packing system in a very long stroke pumping unit well bore according to any of claims 1 to 5 wherein the rigid polished rod (33) and the pump rod (341) are threaded together.
8. The packing system in a very long stroke pump well bore according to any of claims 1 to 5 wherein the bottom of the pump (34) has a bell (314).
9. The packing system in a super long stroke pumping unit well bore according to any of claims 1 to 5 wherein the wellhead assembly (2) includes a closure plate (21), the closure plate (21) being located on the wellhead and the catenary (4) passing through the closure plate (21).
10. The packing system in a very long stroke pumping well bore according to any of claims 1 to 5, characterized in that it further comprises a buffer centralizing wheel (5), the buffer centralizing wheel (5) is located above the wellhead device (2), the suspension rope (4) is wound on the buffer centralizing wheel (5), and the tangent between the suspension rope (4) and the buffer centralizing wheel (5) coincides with the axis of the rigid polished rod (33).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010321877.6A CN113530488A (en) | 2020-04-22 | 2020-04-22 | Packing sealing system in shaft of ultra-long stroke oil pumping machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010321877.6A CN113530488A (en) | 2020-04-22 | 2020-04-22 | Packing sealing system in shaft of ultra-long stroke oil pumping machine |
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| US4714110A (en) * | 1984-11-04 | 1987-12-22 | Dysarz Edward D | Device to relieve sucker rod torque below ground level in a petroleum well |
| CN1375617A (en) * | 2002-04-29 | 2002-10-23 | 盘锦金盘科技有限责任公司 | Multiple well interactive autobalance integral intelligent oil pumping unit |
| CN204436334U (en) * | 2014-05-04 | 2015-07-01 | 鄂德刚 | A kind of short ultra-long-stroke Based Intelligent Control winch type pulling oil production system |
| CN105625973A (en) * | 2014-10-28 | 2016-06-01 | 中国石油天然气股份有限公司 | Wellhead oil extraction sealing device |
| CN106958430A (en) * | 2016-01-08 | 2017-07-18 | 于立成 | Rod beam-pumping unit well head sealing apparatus |
| CN108397162A (en) * | 2018-05-18 | 2018-08-14 | 青岛新胜石油机械有限公司 | Oil production equipment and oil extraction system |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4714110A (en) * | 1984-11-04 | 1987-12-22 | Dysarz Edward D | Device to relieve sucker rod torque below ground level in a petroleum well |
| CN1375617A (en) * | 2002-04-29 | 2002-10-23 | 盘锦金盘科技有限责任公司 | Multiple well interactive autobalance integral intelligent oil pumping unit |
| CN204436334U (en) * | 2014-05-04 | 2015-07-01 | 鄂德刚 | A kind of short ultra-long-stroke Based Intelligent Control winch type pulling oil production system |
| CN105625973A (en) * | 2014-10-28 | 2016-06-01 | 中国石油天然气股份有限公司 | Wellhead oil extraction sealing device |
| CN106958430A (en) * | 2016-01-08 | 2017-07-18 | 于立成 | Rod beam-pumping unit well head sealing apparatus |
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