CN102828716B - Sealed type hydraulic driving adjustable speed cutter of oil pipe string with diameter being phi 73mm or greater - Google Patents

Sealed type hydraulic driving adjustable speed cutter of oil pipe string with diameter being phi 73mm or greater Download PDF

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Publication number
CN102828716B
CN102828716B CN201210346765.1A CN201210346765A CN102828716B CN 102828716 B CN102828716 B CN 102828716B CN 201210346765 A CN201210346765 A CN 201210346765A CN 102828716 B CN102828716 B CN 102828716B
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CN
China
Prior art keywords
pipe
diameter
rotatably
piston
threaded
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CN201210346765.1A
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Chinese (zh)
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CN102828716A (en
Inventor
刘巨保
李治淼
张强
徐世博
岳欠杯
罗敏
陈建业
娄勇
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东北石油大学
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Priority to CN201210346765.1A priority Critical patent/CN102828716B/en
Publication of CN102828716A publication Critical patent/CN102828716A/en
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Publication of CN102828716B publication Critical patent/CN102828716B/en

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Abstract

The invention discloses a sealed type hydraulic driving adjustable speed cutter of an oil pipe string with the diameter being phi 73mm or greater and solves the problem of cutting incapability of oil pipes and sleeve pipes in small sizes. The cutter consists of a speed regulating system, a motive power driving system and a spraying system, wherein a motive power pipe in the motive power system consists of two internal reducer pipes wound on a spiral groove of a pipe support body, when cutting liquid flows through the internal reducer pipes, the corresponding piston force is generated, the piston force is resolved in the axial direction and the annular direction, the two internal reducer pipes are in symmetrical arrangement, and the force couple is formed in the annular direction, so the torque is output, and the cutting goal is reached. The tool has the advantages that the pipe string with the minimum inner diameter being 62mm can be cut, in addition, the cutter can be used as a tool for cleaning the inner wall of the pipe string, and the blank of the small-diameter pipe string cutting is filled.

Description

The closed hydraulic drive adjustable speed cutter of Φ 73mm and above tubing string
Technical field
The present invention relates to a kind of tubing string cutting tool, particularly jet cutting tool.
Background technology
In the engineering accident of Oil/gas Well, it is modal for being hampered, meeting card, is also that intractability is larger simultaneously.Along with the development of oilfield exploitation, the phenomenon such as distortion, bad break of the down-hole oil tube in oil field in all parts of the country also increases year by year, and the flexural deformation of tubing string, makes construction in later period operation more difficult.Therefore, after workover treatment needs to cut oil pipe, just can carry out salvaging, the subsequent job such as reparation.Conventional tubing string cutting technique mainly contains the cutting of machine cuts, chemical cleavage and waterpower.Chemical cleavage is entered instrument under referring to and using cable or coiled tubing and is cut by corrosion or blasting method.Chemical cleavage tool assemble process is more dangerous, uses the consumption of the accurate chemical agent of middle needs, if the subjob again of unsuccessful needs, and operating condition requires that hole deviation can not be too large.Machine cuts enters motor under using drilling rod or coiled tubing and mechanical cutter cuts, when cutting oil pipe, the sleeve pipe of different model, need the mechanical cutter using correspondingly-sized, and instrument easily weares and teares and lost efficacy, the wall thickness dimension that cutter can cut is also limited.Jet cutting enters cutting tool under referring to and using drilling rod or coiled tubing and utilizes the fluid of belt grinding character to carry out cutting operation, not only simple, the safely cleaning of operating process, and same specification instrument can meet the tubing string cutting of many sizes and different wall, can use on High angle and horizontal well.Therefore in oilfield downhole operation, very wide application prospect is had.
China University Of Petroleum Beijing Wang Ruihe teaches team and designs a set of abradant jet and cut bushing installation under water, and its internal cutting system is applicable to the sleeve pipe and 30 of 7 " ~ 20 " " marine riser cut, but " small size sleeve pipe below and oil pipe then cannot cut for 7.Its structure provides rotary power by hydraulic motor, is transferred torque on main shaft, then be delivered to rotary cutting head by main shaft by transition pipe nipple by motor spindle, flat key.Cutting liquid is then connected in the chamber of core barrel by high pressure line joint, enters rotary cutting head by the perforate of central axis and the centre bore of transition pipe nipple, is sprayed realize cutting by nozzle.Be characterized in providing moment of torsion by the hydraulic motor of known speed, will cut liquid and introduce in rotating drum, rotation speed constant cannot regulate.Its structure is owing to being subject to hydraulic motor restriction, and size is comparatively large, and complex structure, need have fluid motor-driven liquid and circumgyration incision liquid two to overlap liquid instrument, operation inconvenience.Owing to there is above defect, this kind of equipment cannot carry out cutting operation in small size caliber.
Summary of the invention
The object of the invention is for Problems existing in background technology, a kind of instrument that can carry out jet cutting to small size sleeve pipe or oil pipe is provided.
For achieving the above object, the technical scheme that the application adopts is: the closed hydraulic drive adjustable speed cutter of Φ 73mm and above tubing string, from top to bottom successively by governing system, power drive line unify spraying system composition, wherein governing system comprises crossover sub, dummy piston, on to be rotatably connected body, decelerating casing, spring mechanism, movable friction plate and static friction sheet, crossover sub is threaded with decelerating casing, on the body that is rotatably connected be positioned at decelerating casing center by axle sleeve, crossover sub and on the Ti Zhou center that is rotatably connected centre bore is set respectively, on be rotatably connected body top cover have dummy piston, the sidewall of above-mentioned decelerating casing sets out oilhole, and the chamber of dummy piston bottom is lubricating cavity, and the chamber that cutting liquid flows through is cutting chamber, on be rotatably connected body and movable friction plate and static friction sheet and spring mechanism form disc brake mechanism.
Described power-driven system, comprise pipe dish, power pipe, lower pipe dish, taper roll bearing, shell and lower rotation connector, shell is threaded with decelerating casing, upper pipe dish is threaded in the lower end of the body that is rotatably connected, lower pipe dish is threaded in the upper end of lower rotation connector, the two ends of power pipe are fixing in the enclosure by upper, lower tube dish, lower rotation connector is fixing in the enclosure by taper roll bearing, the lower sides of shell arranges oil filler point, the lower port of shell is threaded end cap, and lower rotation connector is through end cap; Above-mentioned power pipe is made up of two inner-diameter changeable pipes and pipe supporter, inner-diameter changeable pipe inside wherein forms some sections of diameter-changing cavities, be connected chamber between every two sections of diameter-changing cavities, each section of diameter-changing cavity adopts the cylindric of undergauge structure respectively into, outlet, and connected chamber is cylindric; Pipe supporter is that external surface has two spiral fluted cylinders, and two inner-diameter changeable pipes are symmetrical in the central axis of pipe supporter and are coiled in two helicla flutes of pipe supporter respectively, and the both ends open of two inner-diameter changeable pipes is stuck on pipe dish and lower pipe dish.
Described spraying system, comprise sprayer body, nozzle and nozzle block, sprayer body is threaded in the tail end of lower rotation connector, and the sidewall of sprayer body is by nozzle block fixed nozzle, the axle center of lower rotation connector arranges centre bore, and the centre bore of lower rotation connector is communicated with nozzle.
Described dummy piston comprises interior sealing fixed body, piston body and external seal fixed body, the inner side of piston body and outside arrange external seal parts and interior seal member respectively, in, the quantity of external seal parts is respectively twice, in twice, interior seal stopper ring is set between seal member, between twice external seal parts, external seal baffle ring is set, in above-mentioned, external seal parts are respectively by interior, external seal fixed body is fixing on the piston body, aperture is had in the middle of interior seal stopper ring and external seal baffle ring, connect on the piston body by pin, piston body and interior, external seal fixed body adopts and is threaded.
Described disc brake mechanism, comprise the body that is rotatably connected, spring mechanism and some kinematics and static friction sheets, wherein static friction sheet and movable friction plate are alternately placed, static friction sheet is connected with decelerating casing key, movable friction plate with on the body key that is rotatably connected be connected, static friction sheet top is rotatably connected externally is fixed with spring mechanism.
Beneficial effect: this tool construction is simply ingenious, safe and reliable, and it possesses following characteristics:
1) small size: this instrument can realize the tubing string internal cutting that minimum diameter is 62mm, and cutting equipment outside dimension is in the past large, cannot enter down small size tubing string, can not realize the internal cutting of pipe with small pipe diameter;
2) closed: the fluid cutting liquid in this tool interior working chamber and tubing string string is separated by dummy piston, and wherein working chamber inner part works under machine oil environment, does not affect by cutting liquid;
3) adjustable speed: when rotary speed is lower, this instrument can be used as cutting tool and uses; When rotary speed is higher, can be used as pipe string internal wall cleaning means and use.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of tubing string cutter of the present invention.
Fig. 2 is cutter upper semisection structural representation.
Fig. 3 is cutter lower semisection structural representation.
Fig. 4 is the structural representation of dummy piston.
Fig. 5 is the perspective view of power pipe.
Fig. 6 is the structural representation of power pipe.
Fig. 7 be Fig. 6 partly cut open figure.
Fig. 8 is the structural representation of reducer pipe.
Fig. 9 is the A-A view in Fig. 1 and Fig. 3.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is further illustrated:
By Fig. 1 composition graphs 2, shown in Fig. 3: the Φ 73mm of the application and the closed hydraulic drive adjustable speed cutter of above tubing string, from top to bottom successively by governing system, power drive line unify spraying system composition, wherein governing system comprises crossover sub 1, dummy piston 2, on to be rotatably connected body 3, decelerating casing 6, spring mechanism 7, movable friction plate 8 and static friction sheet 9, crossover sub 1 is threaded with decelerating casing 6, on the body 3 that is rotatably connected be positioned at decelerating casing 6 center by axle sleeve 5, crossover sub 1 and on the be rotatably connected axle center of body 3 centre bore is set respectively, on be rotatably connected body 3 top cover have dummy piston 2, as shown in Figure 4: described dummy piston 2 comprises interior sealing fixed body 21, piston body 22 and external seal fixed body 28, the inner side of piston body 22 and outside arrange external seal parts 23 and interior seal member 27 respectively, in, the quantity of external seal parts is respectively twice, interior seal stopper ring 26 is set between seal member in twice, between twice external seal parts, external seal baffle ring 24 is set, in above-mentioned, external seal parts are respectively by interior, external seal fixed body 21, 28 are fixed on piston body 22, aperture is had in the middle of interior seal stopper ring 26 and external seal baffle ring 24, be connected on piston body 22 by pin 25, piston body 22 is with interior, external seal fixed body 21, 28 employings are threaded.The sidewall of above-mentioned decelerating casing 6 sets out oilhole 4, and the chamber of dummy piston less than 2 forms lubricating cavity 10, and the chamber that cutting liquid flows through is cutting chamber 11; Dummy piston 2 is by moving axially the pressure balanced between lubricating cavity 10 and cutting chamber 11.On be rotatably connected body 3 and movable friction plate 8 and static friction sheet 9 and spring mechanism 7 form disc brake mechanism.
Described power-driven system, comprise pipe dish 31, power pipe 32, lower pipe dish 33, taper roll bearing 34, shell 36 and lower rotation connector 38, shell 36 is threaded with decelerating casing 6, upper pipe dish 31 is threaded in the lower end of the body 3 that is rotatably connected, lower pipe dish 33 is threaded in the upper end of lower rotation connector 38, the two ends of power pipe 32 are by upper, lower pipe dish 31, 33 are fixed in shell 36, lower rotation connector 38 is fixed in shell 36 by taper roll bearing 34, the lower sides of shell 36 arranges oil filler point 35, the lower end of shell 36 is threaded end cap 37, lower rotation connector 38 is through end cap 37, shown in Fig. 5,6,7,8: above-mentioned power pipe 32 is made up of two inner-diameter changeable pipes 41 and pipe supporter 42, inner-diameter changeable pipe 41 inside wherein forms some sections of diameter-changing cavities 43, be connected chamber 44 between every two sections of diameter-changing cavities 43, each section of diameter-changing cavity 43 adopts the cylindric of undergauge structure into, outlet, and connected chamber 44 is cylindric, pipe supporter 42 is cylinders that external surface has two helicla flutes 45, two inner-diameter changeable pipes 41 are symmetrical in the central axis of pipe supporter 42 and are coiled in two helicla flutes 45 of pipe supporter 42 respectively, and the both ends open of two inner-diameter changeable pipes 41 is stuck on pipe dish 31 and lower pipe dish 33.Lower rotation connector 38 is used for connecting spraying system equipment, power pipe 32 produces corresponding piston force under the effect of liquid, and this piston force is decomposed into axis and hoop both direction, because two inner-diameter changeable pipes are arranged symmetrically with, so form couple on hoop, thus output torque.Axial load by the righting of lower rotation connector 38, and is delivered on shell 36 by taper roll bearing 34.On the body 3 that is rotatably connected transfer torque to governing system, lower rotation connector 38 transfers torque to spraying system.
As shown in Figure 9: described spraying system, comprise sprayer body 53, nozzle 52 and nozzle block 51, sprayer body 53 is threaded in the tail end of lower rotation connector 38, the sidewall of sprayer body 53 is by nozzle block 51 fixed nozzle 52, the axle center of lower rotation connector 38 arranges centre bore, and the centre bore of lower rotation connector 38 is communicated with nozzle 52.
This instrument injects cutting liquid by ground pump truck to provide rotary power and jet pressure, particularly cutting liquid enters from the centre bore of crossover sub, through the centre bore of the centre bore of the body that is above rotatably connected, the inner-diameter changeable pipe of power pipe and lower rotation connector, the airtight chamber that above-mentioned cutting liquid flows through is referred to as cutting chamber 11, the oil pressure in lubricating cavity 10 is greater than due to the pressure in cutting chamber 11, dummy piston 2 produces axial displacement under the effect of pressure reduction, compress the lubricating fluid of in lubricating cavity 10, until pressure at two ends balance.Cutting liquid enters the centre bore of the body 3 that is rotatably connected, when being entered in power pipe 32 by upper pipe dish 31, due to the change of power pipe 32 inner flow passage, liquid produces certain piston force to power pipe 32, and piston force in power pipe 32 and central axis exist certain angle, produce moment of torsion so promote to rotate.After cutting liquid flows through power pipe 32, enter sprayer body 53 from nozzle 52 injection at a high speed by lower rotation connector 38, realize circumgyration incision.The rotating speed of this instrument controls to be made up of the friction plate organized and spring mechanism 7 more, the frictional force between friction plate can be regulated by the control of the decrement of spring mechanism 7, wherein static friction sheet 9 and movable friction plate 8 are alternately placed, static friction sheet 9 is connected with decelerating casing 6 key, and movable friction plate 8 with on body 3 key that is rotatably connected be connected, produce frictional force by the relative motion between them, by controlling the size of frictional force to the adjustment of spring mechanism 7, realize the control of rotating speed.

Claims (2)

1. the closed hydraulic drive adjustable speed cutter of Φ 73mm and above tubing string, from top to bottom successively by governing system, power drive line unify spraying system composition, it is characterized in that: described governing system, comprise crossover sub, dummy piston, on to be rotatably connected body, decelerating casing, spring mechanism, movable friction plate and static friction sheet, crossover sub is threaded with decelerating casing, on the body that is rotatably connected be positioned at decelerating casing center by axle sleeve, crossover sub and on the Ti Zhou center that is rotatably connected centre bore is set respectively, on be rotatably connected body top cover have dummy piston, the sidewall of above-mentioned decelerating casing sets out oilhole, and the chamber of dummy piston bottom is lubricating cavity, and the chamber that cutting liquid flows through is cutting chamber, on be rotatably connected body and movable friction plate and static friction sheet and spring mechanism form disc brake mechanism, wherein static friction sheet and movable friction plate are respectively several, the two is alternately placed, static friction sheet is connected with decelerating casing key, movable friction plate with on the body key that is rotatably connected be connected, static friction sheet top is rotatably connected externally is fixed with spring mechanism, described power-driven system, comprise pipe dish, power pipe, lower pipe dish, bearing, shell and lower rotation connector, shell is threaded with decelerating casing, upper pipe dish is threaded in the lower end of the body that is rotatably connected, lower pipe dish is threaded in the upper end of lower rotation connector, the two ends of power pipe are fixing in the enclosure by upper, lower tube dish, lower rotation connector is fixing in the enclosure by bearing, the lower sides of shell arranges oil filler point, the lower end of shell is threaded end cap, and lower rotation connector is through end cap, above-mentioned power pipe is made up of two inner-diameter changeable pipes and pipe supporter, and inner-diameter changeable pipe wherein inside forms some sections of diameter-changing cavities, be connected chamber between every two sections of diameter-changing cavities, and each section of diameter-changing cavity is cylindric into, outlet employing undergauge structure, and connected chamber is cylindric, pipe supporter is that external surface has two spiral fluted cylinders, and two inner-diameter changeable pipes are symmetrical in the central axis of pipe supporter and are coiled in two helicla flutes of pipe supporter respectively, and the both ends open of two inner-diameter changeable pipes is stuck in pipe dish and lower pipe dish, described spraying system, comprise sprayer body, nozzle and nozzle block, sprayer body is threaded in the tail end of lower rotation connector, and the sidewall of sprayer body is by nozzle block fixed nozzle, the axle center of lower rotation connector arranges centre bore, and the centre bore of lower rotation connector is communicated with nozzle.
2. the closed hydraulic drive adjustable speed cutter of Φ 73mm according to claim 1 and above tubing string, it is characterized in that: described dummy piston comprises interior sealing fixed body, piston body and external seal fixed body, the inner side of piston body and outside arrange external seal parts and interior seal member respectively, in, the quantity of external seal parts is respectively twice, in twice, interior seal stopper ring is set between seal member, between twice external seal parts, external seal baffle ring is set, in above-mentioned, external seal parts are respectively by interior, external seal fixed body is fixing on the piston body, aperture is had in the middle of interior seal stopper ring and external seal baffle ring, connect on the piston body by pin, piston body and interior, external seal fixed body adopts and is threaded.
CN201210346765.1A 2012-09-18 2012-09-18 Sealed type hydraulic driving adjustable speed cutter of oil pipe string with diameter being phi 73mm or greater CN102828716B (en)

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CN103089181B (en) * 2013-01-14 2015-09-09 中国石油大学(华东) Hydraulic cutter in pipe
CN105003221B (en) * 2015-06-16 2017-05-24 东北石油大学 Double-concentric controllable-speed cutter using abrasive jets
CN105134118A (en) * 2015-07-22 2015-12-09 中国石油化工股份有限公司 Cutting method for coiled tubing cutting tool string
CN105134117B (en) * 2015-09-22 2017-07-14 中海油能源发展股份有限公司 Integral rotary high-pressure jet cutting head
CN105298422B (en) * 2015-10-21 2019-05-07 中国石油天然气集团公司 Continuous pipe waterpower driven rotary diced system
CN105298421B (en) * 2015-10-21 2018-05-04 中国石油天然气集团公司 Continuous pipe abradant jet speed limit rotary cutting tool

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157742B (en) * 1984-04-19 1987-05-20 Camco Inc Fluid actuated energy charged well service line cutter
CN2725508Y (en) * 2004-08-30 2005-09-14 邹钢 Pnoumatic pushing device used for oil well casing pipe sealing
CN201232532Y (en) * 2008-07-04 2009-05-06 中国石油化工股份有限公司江苏油田分公司石油工程技术研究院 Hydraulic combination window opening tool
WO2010017139A2 (en) * 2008-08-04 2010-02-11 Radjet Llc Apparatus and method for controlling the feed-in speed of a high pressure hose in jet drilling operations
RU2410525C1 (en) * 2009-11-02 2011-01-27 Общество с ограниченной ответственностью "ИНКОС" Arrangement of cutting tools of side opening in casing pipe of well and method of azimuthal orientation and attachment of wedge-diverter
CN201786301U (en) * 2010-08-11 2011-04-06 山东正元地质资源勘查有限责任公司烟台分公司 Three-head hydraulic cutting knife
CN202108447U (en) * 2011-05-26 2012-01-11 安丘市石油钻采机械厂 Casing milling tool assembly

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157742B (en) * 1984-04-19 1987-05-20 Camco Inc Fluid actuated energy charged well service line cutter
CN2725508Y (en) * 2004-08-30 2005-09-14 邹钢 Pnoumatic pushing device used for oil well casing pipe sealing
CN201232532Y (en) * 2008-07-04 2009-05-06 中国石油化工股份有限公司江苏油田分公司石油工程技术研究院 Hydraulic combination window opening tool
WO2010017139A2 (en) * 2008-08-04 2010-02-11 Radjet Llc Apparatus and method for controlling the feed-in speed of a high pressure hose in jet drilling operations
RU2410525C1 (en) * 2009-11-02 2011-01-27 Общество с ограниченной ответственностью "ИНКОС" Arrangement of cutting tools of side opening in casing pipe of well and method of azimuthal orientation and attachment of wedge-diverter
CN201786301U (en) * 2010-08-11 2011-04-06 山东正元地质资源勘查有限责任公司烟台分公司 Three-head hydraulic cutting knife
CN202108447U (en) * 2011-05-26 2012-01-11 安丘市石油钻采机械厂 Casing milling tool assembly

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