CN103775062A - Pressure type piston conveying device and method for continuous oil pipe - Google Patents
Pressure type piston conveying device and method for continuous oil pipe Download PDFInfo
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- CN103775062A CN103775062A CN201310316747.3A CN201310316747A CN103775062A CN 103775062 A CN103775062 A CN 103775062A CN 201310316747 A CN201310316747 A CN 201310316747A CN 103775062 A CN103775062 A CN 103775062A
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- 238000000034 method Methods 0.000 title claims description 9
- 238000007789 sealing Methods 0.000 claims abstract description 44
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 38
- 239000010959 steel Substances 0.000 claims abstract description 38
- 239000010985 leather Substances 0.000 claims abstract description 31
- 229920000742 Cotton Polymers 0.000 claims description 12
- 206010058109 Hangnail Diseases 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 8
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000004636 vulcanized rubber Substances 0.000 claims description 7
- 239000004809 Teflon Substances 0.000 claims description 6
- 229920006362 Teflon® Polymers 0.000 claims description 6
- 238000003754 machining Methods 0.000 claims description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 230000006978 adaptation Effects 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 4
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 210000003205 muscle Anatomy 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 230000007306 turnover Effects 0.000 claims description 4
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract 1
- 210000003781 tooth socket Anatomy 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 241000209094 Oryza Species 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 238000009960 carding Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
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Abstract
A coiled tubing pressure type piston conveying device belongs to the technical field of oil fields. The right end of the three-way device is a coiled tubing connector; the left end of the three-way device is a wire inlet, the pressing cap is connected with the wire inlet of the three-way device, the right end of the three-way device is connected with a back cap, a coiled tubing interface is connected with a coiled tubing, a sealing O-shaped ring is connected between a sealing clamping groove of the three-way device and the coiled tubing, a conical tooth socket is connected between the back cap and the coiled tubing, a piston is connected in an inner hole of the coiled tubing and is connected with a pull rod, the other end of the pull rod is connected with a steel wire or a rope, the rubber piston is connected with an arc-shaped leather cup or a pointed leather cup, a splicing port of another rubber piston is connected with a splicing tail to form a multistage rubber piston, one end of the piston is a wire fixing port, the outer circumference of the other end of the piston is provided with. The invention effectively reduces the labor intensity and the operation cost, and can carry out the operations of flaw detection and the like on the coiled tubing.
Description
Technical field
The present invention relates to a kind of coiled tubing pressure type piston conveying device and method, belong to oilfield technology field.
Background technology
Coiled tubing is a kind of flexible minor-diameter steel-tube that has of low-carbon alloy steel making, the operation of oilfield horizontal well downhole testing need to be used for thermometric at inner thermocouple or the capillary tube placed of uninterrupted long oil pipe continuously, at this moment need to be lowered to 1000 meters of coiled tubings at vertical empty well cylinder, rely on gravity to drop into the steel wire of 1000 meters of long extension verticals, taking out coiled tubing tiles to well site again, use one, steel wire to pull 1000 meters of thermocouples and enter coiled tubing, finally use and prefabricated coiled tubing is lowered to horizontal well carries out temperature and pressure test, utilize empty well cylinder gravity to throw steel wire sometimes because the restriction that is subject to other factors such as region cannot be implemented, it is long that this work implements the time, labour intensity is large, need 10 people, crane, carding engine coordinates the work of 8 hours to complete.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of coiled tubing pressure type piston conveying device and method.
A kind of coiled tubing pressure type piston conveying device, the right-hand member of three-way device is coiled tubing interface, the left end of three-way device is incoming line, the incoming line of pressure cap connecting tee device, the right-hand member of three-way device connects back of the body cap, coiled tubing interface connects coiled tubing, between the sealing draw-in groove of three-way device and coiled tubing, be connected with sealing O type circle, between back of the body cap and coiled tubing, be connected with taper facing, in the endoporus of coiled tubing, connect piston, piston cylinder lever connecting rod, the other end of pull bar connects steel wire or rope, between pressure cap and three-way device, be connected with sealing mat, there is gas injection port three-way device upper end, steel wire or lightweight rope are through the through wires hole of the left end endoporus of three-way device, the endoporus of taper facing has tooth shape hangnail, the circumference of taper facing has fluting,
Coiled tubing inside has the weld seam muscle 90 of a <2mm, has irregular burr, length 500-1000 rice;
The piston of tension skeleton: piston carries out the sealing of MULTI CONTACT formula with vulcanized rubber ring, the anti-canting cap of steel prevents that rubber ring from being blown and turns over, and miniature instrument is installed in the top boring of anti-canting cap, and pull bar is tightly connected with cage construction and rubber ring, skeleton is connected with cage construction with rubber ring sealing
One end of rubber piston is grafting tail, and the other end of rubber piston is interface, and rubber piston is connected with arc leather cup or pointed leather cup, and the interface that grafting tail connects another rubber piston forms multistage rubber piston,
One end of piston is line fixing port, and the other end excircle of piston has horizontal segment, and the excircle of piston has track and weld seam by groove, and there is through wires hole at the center of line fixing port.
A method for coiled tubing pressure type piston conveying device, contains following steps;
Use gas as driving force, promote piston and move in coiled tubing inside, steel wire, lightweight rope or micromodule equipment are divided and bring once or twice long coiled tubing into,
Piston carries out the sealing of MULTI CONTACT formula with vulcanized rubber ring, can produce micro-deformation seals gas effectively, the anti-canting cap of steel can prevent that rubber ring from being blown and turn over, the top boring of anti-canting cap is installed miniature instrument additional and is met the needs of producing or detect a flaw, pull bar is tightly connected with cage construction and rubber ring, and skeleton is connected with cage construction with rubber ring sealing, and this kind of mode frictional force is bigger than normal, wear-resisting, be applicable to traction steel wire;
Multistage leather cup type structure can reduce the difficulty of Piston Machining, connected progression can effectively be controlled the size of leather cup and coiled tubing frictional force, each leather cup junction vertical open pores insertion metal tube is fixing can make leather cup air pressure share equally, stressed more even, single piston also can use, be applicable to band lightweight rope and miniature instrument, the various environment of flexible adaptation, this kind of piston is less demanding to air pump;
While using high-power air compressor machine or blast fan, use the teflon piston of non-contacting seal to be with line,
Three-way device the right connected with coiled tubing connects coiled tubing, and sealing ring can bear certain pressure, squeezes into gas by top, and left part is to cotton rope press seal;
Facing locking device uses tooth shape steel ladder hangnail, locks coiled tubing with the distortion of steel ring;
Gas push piston-advance step;
Piston is sent into coiled tubing, tie up cotton rope or instrument, cotton rope penetrates pressure cap and tightens sealing;
Connecting tee device, use conical teeth cover locking coiled tubing, O type circle carries out 2 grades of sealings;
Connect injecting hole, use strength to promote piston-advance;
The anti-canting cap that its front portion of rubber seal piston of ring type structure installs additional is connected with pull bar skeleton, and top connects miniature instrument;
Its multistage end to end pointed and arc leather cup of coiled tubing pressure type piston, the perforate air pressure of junction, side is shared equally;
The pre-small post-large non-contacting seal with horizontal segment fluting of coiled tubing pressure type piston conveying device, before and after it, perforate is easy to threading and glue fixing seal;
The three way type structure of threading and gas injection common-use tunnel, is used the distortion of taper facing as back of the body cap locking coiled tubing, and left part pressure cap compresses draught line is sealed.
The present invention uses gas as driving force, promoting piston moves in coiled tubing inside, steel wire, lightweight rope or micromodule equipment are divided and bring once or twice long coiled tubing into, in operation process, remove the operation of empty well cylinder and crane, effectively reduce labour intensity and operating cost, and can be to the coiled tubing operation such as detect a flaw.
Accompanying drawing explanation
When considered in conjunction with the accompanying drawings, by the detailed description with reference to below, can more completely understand better the present invention and easily learn wherein many advantages of following, but accompanying drawing described herein is used to provide a further understanding of the present invention, form a part of the present invention, schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention, as schemed wherein:
Fig. 1 is combination unit structural representation of the present invention.
Fig. 2 is coiled tubing structural representation of the present invention.
Fig. 3 is rubber annular rubber contact seal piston structure schematic diagram of the present invention.
Fig. 4 is single packed-piston structural representation of the present invention.
Fig. 5 is multistage connected leather bucket structural representation of the present invention.
Fig. 6 a is non-contacting seal fluting band line teflon piston structural representation of the present invention.
Fig. 6 b is non-contacting seal fluting band line teflon piston structural representation of the present invention.
Fig. 7 is coiled tubing three-way device structural representation of the present invention.
Fig. 8 is distortion facing steel ring structure schematic diagram of the present invention.
Fig. 9 is distortion facing steel ring cross section structure schematic diagram of the present invention.
Below in conjunction with drawings and Examples, the present invention is further described.
The specific embodiment
Obviously the many modifications and variations that, those skilled in the art do based on aim of the present invention belong to protection scope of the present invention.
Embodiment 1: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6 a, Fig. 6 b, Fig. 7, Fig. 8 and Fig. 9,
The present invention uses gas as driving force, promoting piston moves in coiled tubing inside, steel wire, lightweight rope or micromodule equipment are divided and bring once or twice long coiled tubing into, in operation process, remove the operation of empty well cylinder and crane, effectively reduce labour intensity and operating cost, and can be to the coiled tubing operation such as detect a flaw.
As shown in Fig. 1, Fig. 7, Fig. 8 and Fig. 9, the right-hand member of three-way device 9 is coiled tubing interface 34, the left end of three-way device 9 is incoming line 31, the incoming line 31 of pressure cap 1 connecting tee device 9, the right-hand member of three-way device 9 connects back of the body cap 7, coiled tubing interface 34 connects coiled tubing 5, between the sealing draw-in groove 33 of three-way device 9 and coiled tubing 5, be connected with sealing O type circle 3, between back of the body cap 7 and coiled tubing 5, be connected with taper facing 4, in the endoporus of coiled tubing 5, connect piston 6, piston 6 cylinder lever connecting rods 8, the other end of pull bar 8 connects steel wire or lightweight rope 11, between pressure cap 1 and three-way device 9, be connected with sealing mat 10, there is gas injection port 2 three-way device 9 upper ends, steel wire or lightweight rope 11 are through the through wires hole 32 of the left end endoporus of three-way device 9, the endoporus of taper facing 4 has tooth shape hangnail 35, the circumference of taper facing 4 has fluting 36.
As shown in Fig. 2 coiled tubing schematic diagram, coiled tubing 5 inside have the weld seam muscle 90 of a <2mm, have some small-sized irregular burrs, and length 500-1000 rice is not etc.;
As shown in Figure 3, the piston 6 of tension skeleton: piston 6 use vulcanized rubber rings carry out the sealing of MULTI CONTACT formula, can produce micro-deformation seals gas effectively, the anti-canting cap 13 of steel can prevent that rubber ring from being blown and turn over, the top boring of anti-canting cap 13 is installed miniature instrument 15 additional and is met the needs of producing or detect a flaw, pull bar 8 is connected with rubber ring sealing 12 with skeleton 14 structures, skeleton 14 is connected with skeleton 14 structures with rubber ring sealing 12, this kind of mode frictional force is bigger than normal, wear-resisting, be applicable to traction steel wire.
As shown in Figure 4,
One end of rubber piston is grafting tail 19, and the other end of rubber piston is interface 21, and rubber piston is connected with arc leather cup or pointed leather cup 20, and the interface 21 that grafting tail 19 connects another rubber piston forms multistage rubber piston,
Multistage leather cup type structure can reduce the difficulty of Piston Machining, connected progression can effectively be controlled the size of leather cup and coiled tubing frictional force, each leather cup junction vertical open pores insertion metal tube is fixing can make leather cup air pressure share equally, stressed more even, single piston also can use, be applicable to band lightweight rope and miniature instrument, the various environment of flexible adaptation, this kind of piston is less demanding to air pump.
As shown in Fig. 6 a, Fig. 6 b,
One end of piston 6 is line fixing port 41, and the other end excircle of piston 6 has horizontal segment 43, and the excircle of piston 6 has track 42 and weld seam by groove 45, and there is through wires hole 44. at line fixing port 41 center
Light-duty hard piston: can use the teflon piston of non-contacting seal to be with line while using high-power air compressor machine or blast fan, this kind of Piston Machining is simple, and frictional force is very little, band line efficiency is high, send lightweight rope for band.
5, connect coiled tubing with the connected three-way device the right of coiled tubing, sealing ring can bear certain pressure, squeezes into gas by top, and left part is to cotton rope press seal.
6, facing locking device uses tooth shape steel ladder hangnail, locks coiled tubing with the distortion of steel ring.
Gas push piston-advance step;
Piston is sent into coiled tubing, tie up cotton rope or instrument, cotton rope penetrates pressure cap and tightens sealing.
Connecting tee device, use conical teeth cover locking coiled tubing, O type circle carries out 2 grades of sealings
Connect injecting hole, use strength to promote piston-advance.
Coiled tubing pressure type piston conveying device: shown in Fig. 2, the rubber seal piston structure of its ring type structure, the structure that the anti-canting cap that its front portion installs additional is connected with pull bar skeleton, and top can connect the helicitic texture of miniature instrument.
Shown in coiled tubing pressure type piston conveying device Fig. 4, Fig. 5, its multistage end to end pointed and arc leather bowl structure, the perforate air pressure of junction, side is shared structure equally.
Coiled tubing pressure type piston conveying device: shown in Fig. 6, the solid structure of its pre-small post-large non-contacting seal with horizontal segment fluting, before and after it, perforate is easy to the structure of threading and glue fixing seal.
Coiled tubing pressure type piston conveying device: shown in Fig. 7, Fig. 8 and Fig. 9, the three way type structure of its threading and gas injection common-use tunnel, and use the structure of taper facing distortion as back of the body cap locking coiled tubing, left part pressure cap compresses the structure to draught line sealing.
Embodiment 2: as shown in Figure 1, Figure 2, shown in Fig. 3, Fig. 4, Fig. 5, Fig. 6 a, Fig. 6 b, Fig. 7, Fig. 8 and Fig. 9,
A kind of coiled tubing pressure type piston conveying device, the right-hand member of three-way device 9 is coiled tubing interface 34, the left end of three-way device 9 is incoming line 31, the incoming line 31 of pressure cap 1 connecting tee device 9, the right-hand member of three-way device 9 connects back of the body cap 7, coiled tubing interface 34 connects coiled tubing 5, between the sealing draw-in groove 33 of three-way device 9 and coiled tubing 5, be connected with sealing O type circle 3, between back of the body cap 7 and coiled tubing 5, be connected with taper facing 4, in the endoporus of coiled tubing 5, connect piston 6, piston 6 cylinder lever connecting rods 8, the other end of pull bar 8 connects steel wire or lightweight rope 11, between pressure cap 1 and three-way device 9, be connected with sealing mat 10, there is gas injection port 2 three-way device 9 upper ends, steel wire or lightweight rope 11 are through the through wires hole 32 of the left end endoporus of three-way device 9, the endoporus of taper facing 4 has tooth shape hangnail 35, the circumference of taper facing 4 has fluting 36,
The piston 6 of tension skeleton: piston 6 use vulcanized rubber rings carry out the sealing of MULTI CONTACT formula, the anti-canting cap 13 of steel prevents that rubber ring from being blown and turns over, miniature instrument 15 is installed in the top boring of anti-canting cap 13, pull bar 8 is connected with rubber ring sealing 12 with skeleton 14 structures, skeleton 14 is connected with skeleton 14 structures with rubber ring sealing 12
One end of rubber piston is grafting tail 19, and the other end of rubber piston is interface 21, and rubber piston is connected with arc leather cup or pointed leather cup 20, and the interface 21 that grafting tail 19 connects another rubber piston forms multistage rubber piston,
One end of piston 6 is line fixing port 41, and the other end excircle of piston 6 has horizontal segment 43, and the excircle of piston 6 has track 42 and weld seam by groove 45, and there is through wires hole 44 at line fixing port 41 center.
A method for coiled tubing pressure type piston conveying device, is characterized in that containing following steps;
Use gas as driving force, promote piston and move in coiled tubing inside, steel wire, lightweight rope or micromodule equipment are divided and bring once or twice long coiled tubing into,
Piston 6 use vulcanized rubber rings carry out the sealing of MULTI CONTACT formula, can produce micro-deformation seals gas effectively, the anti-canting cap 13 of steel can prevent that rubber ring from being blown and turn over, the top boring of anti-canting cap 13 is installed miniature instrument 15 additional and is met the needs of producing or detect a flaw, pull bar 8 is connected with rubber ring sealing 12 with skeleton 14 structures, and skeleton 14 is connected with skeleton 14 structures with rubber ring sealing 12, and this kind of mode frictional force is bigger than normal, wear-resisting, be applicable to traction steel wire;
Multistage leather cup type structure can reduce the difficulty of Piston Machining, connected progression can effectively be controlled the size of leather cup and coiled tubing frictional force, each leather cup junction vertical open pores insertion metal tube is fixing can make leather cup air pressure share equally, stressed more even, single piston also can use, be applicable to band lightweight rope and miniature instrument, the various environment of flexible adaptation, this kind of piston is less demanding to air pump;
While using high-power air compressor machine or blast fan, use the teflon piston of non-contacting seal to be with line,
Three-way device the right connected with coiled tubing connects coiled tubing, and sealing ring can bear certain pressure, squeezes into gas by top, and left part is to cotton rope press seal;
Facing locking device uses tooth shape steel ladder hangnail, locks coiled tubing with the distortion of steel ring;
Gas push piston-advance step;
Piston is sent into coiled tubing, tie up cotton rope or instrument, cotton rope penetrates pressure cap and tightens sealing;
Connecting tee device, use conical teeth cover locking coiled tubing, O type circle carries out 2 grades of sealings;
Connect injecting hole, use strength to promote piston-advance;
The anti-canting cap that its front portion of rubber seal piston of ring type structure installs additional is connected with pull bar skeleton, and top connects miniature instrument;
Its multistage end to end pointed and arc leather cup of coiled tubing pressure type piston, the perforate air pressure of junction, side is shared equally;
The pre-small post-large non-contacting seal with horizontal segment fluting of coiled tubing pressure type piston conveying device, before and after it, perforate is easy to threading and glue fixing seal;
The three way type structure of threading and gas injection common-use tunnel, is used the distortion of taper facing as back of the body cap locking coiled tubing, and left part pressure cap compresses draught line is sealed.
As mentioned above, embodiments of the invention are explained, but as long as not departing from fact inventive point of the present invention and effect can have a lot of distortion, this will be readily apparent to persons skilled in the art.Therefore, within such variation is also all included in protection scope of the present invention.
Claims (2)
1. a coiled tubing pressure type piston conveying device, the right-hand member that it is characterized in that three-way device is coiled tubing interface, the left end of three-way device is incoming line, the incoming line of pressure cap connecting tee device, the right-hand member of three-way device connects back of the body cap, coiled tubing interface connects coiled tubing, between the sealing draw-in groove of three-way device and coiled tubing, be connected with sealing O type circle, between back of the body cap and coiled tubing, be connected with taper facing, in the endoporus of coiled tubing, connect piston, piston cylinder lever connecting rod, the other end of pull bar connects steel wire or rope, between pressure cap and three-way device, be connected with sealing mat, there is gas injection port three-way device upper end, steel wire or lightweight rope are through the through wires hole of the left end endoporus of three-way device, the endoporus of taper facing has tooth shape hangnail, the circumference of taper facing has fluting,
Coiled tubing inside has the weld seam muscle of a <2mm, has irregular burr, length 500-1000 rice;
The piston of tension skeleton: piston carries out the sealing of MULTI CONTACT formula with vulcanized rubber ring, the anti-canting cap of steel prevents that rubber ring from being blown and turns over, and miniature instrument is installed in the top boring of anti-canting cap, and pull bar is tightly connected with cage construction and rubber ring, skeleton is connected with cage construction with rubber ring sealing
One end of rubber piston is grafting tail, and the other end of rubber piston is interface, and rubber piston is connected with arc leather cup or pointed leather cup, and the interface that grafting tail connects another rubber piston forms multistage rubber piston,
One end of piston is line fixing port, and the other end excircle of piston has horizontal segment, and the excircle of piston has track and weld seam by groove, and there is through wires hole at the center of line fixing port.
2. the method for a kind of coiled tubing pressure type piston conveying device according to claim 1, is characterized in that containing following steps;
Use gas as driving force, promote piston and move in coiled tubing inside, steel wire, lightweight rope or micromodule equipment are divided and bring once or twice long coiled tubing into,
Piston carries out the sealing of MULTI CONTACT formula with vulcanized rubber ring, can produce micro-deformation seals gas effectively, the anti-canting cap of steel can prevent that rubber ring from being blown and turn over, the top boring of anti-canting cap is installed miniature instrument additional and is met the needs of producing or detect a flaw, pull bar is tightly connected with cage construction and rubber ring, and skeleton is connected with cage construction with rubber ring sealing, and this kind of mode frictional force is bigger than normal, wear-resisting, be applicable to traction steel wire;
Multistage leather cup type structure can reduce the difficulty of Piston Machining, connected progression can effectively be controlled the size of leather cup and coiled tubing frictional force, each leather cup junction vertical open pores insertion metal tube is fixing can make leather cup air pressure share equally, stressed more even, single piston also can use, be applicable to band lightweight rope and miniature instrument, the various environment of flexible adaptation, this kind of piston is less demanding to air pump;
While using high-power air compressor machine or blast fan, use the teflon piston of non-contacting seal to be with line,
Three-way device the right connected with coiled tubing connects coiled tubing, and sealing ring can bear certain pressure, squeezes into gas by top, and left part is to cotton rope press seal;
Facing locking device uses tooth shape steel ladder hangnail, locks coiled tubing with the distortion of steel ring;
Gas push piston-advance step;
Piston is sent into coiled tubing, tie up cotton rope or instrument, cotton rope penetrates pressure cap and tightens sealing;
Connecting tee device, use conical teeth cover locking coiled tubing, O type circle carries out 2 grades of sealings;
Connect injecting hole, use strength to promote piston-advance;
The anti-canting cap that its front portion of rubber seal piston of ring type structure installs additional is connected with pull bar skeleton, and top connects miniature instrument;
Its multistage end to end pointed and arc leather cup of coiled tubing pressure type piston, the perforate air pressure of junction, side is shared equally;
The pre-small post-large non-contacting seal with horizontal segment fluting of coiled tubing pressure type piston conveying device, before and after it, perforate is easy to threading and glue fixing seal;
The three way type structure of threading and gas injection common-use tunnel, is used the distortion of taper facing as back of the body cap locking coiled tubing, and left part pressure cap compresses draught line is sealed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310316747.3A CN103775062B (en) | 2013-07-25 | 2013-07-25 | Pressure type piston conveying device and method for continuous oil pipe |
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| CN201310316747.3A CN103775062B (en) | 2013-07-25 | 2013-07-25 | Pressure type piston conveying device and method for continuous oil pipe |
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