CN105089531B - Oil field horizontal well oil production pipe string breaking and falling prevention well device - Google Patents
Oil field horizontal well oil production pipe string breaking and falling prevention well device Download PDFInfo
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- CN105089531B CN105089531B CN201510219549.4A CN201510219549A CN105089531B CN 105089531 B CN105089531 B CN 105089531B CN 201510219549 A CN201510219549 A CN 201510219549A CN 105089531 B CN105089531 B CN 105089531B
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- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 230000002265 prevention Effects 0.000 title description 2
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 230000001133 acceleration Effects 0.000 claims abstract description 4
- 230000035945 sensitivity Effects 0.000 claims abstract description 4
- 230000001050 lubricating effect Effects 0.000 claims abstract description 3
- 241000239290 Araneae Species 0.000 claims description 32
- 238000012856 packing Methods 0.000 claims description 13
- 238000004873 anchoring Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 4
- 238000005381 potential energy Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 6
- 238000010276 construction Methods 0.000 abstract description 2
- 238000004146 energy storage Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 238000011084 recovery Methods 0.000 description 7
- 239000003129 oil well Substances 0.000 description 5
- 230000007774 longterm Effects 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
The invention provides a device for preventing an oil production pipe column from breaking and falling off a well in an oil field horizontal well. The device for preventing the oil production pipe from breaking off the well is designed to meet the requirements of preventing the oil production pipe from breaking off under various working conditions. The device is internally provided with a balance weight energy storage mechanism, a lubricating mechanism and an auxiliary return mechanism, utilizes physical characteristics such as object weightlessness and acceleration, is not limited by a mechanical structure, can protect the good working environment of equipment, improves the sensitivity of tools, and can realize easy unfreezing when fishing broken and disconnected pipe columns. The invention can meet the requirement of preventing the tubular column from breaking off under various working conditions of the oil field horizontal well oil production tubular column, changes the complex salvaging working condition of the horizontal section of the broken off tubular column into the simple salvaging working condition in the straight well section, fundamentally changes the salvaging process after breaking off, can greatly reduce the workload, shorten the well occupying period and save the construction cost.
Description
Technical field
The present invention relates to oilfield horizontal well oil recovery technique fields, in particular to a kind of anti-production pipe of oilfield horizontal well
The disconnected well device that falls off of column.
Background technology
The proportion of technical way of the horizontal well as raising well yield and transformation development scheme, quantity and yield
All it is in very fast ascendant trend.Currently, oilfield horizontal well flow string is consistent with straight well or directional well, and therefore, recovery process
In the inevitably disconnected well accident that falls off of flow string.Due to the particularity of Horizontal Well body structure, once production pipe
Column, which falls off, to be slid into horizontal segment, it will is increased and is salvaged difficulty, increases the cost and risk of salvaging.
ASSOCIATE STATISTICS shows that the cost of the common horizontal well of a bite is about 2 times of straight well or so, but its yield is up to straight well
It is 3~5 times, even more.The fishing tool of horizontal well generally requires special designing, it is contemplated that the particularity of horizontal casing programme,
Fishing string also needs additional centralizer, booster and bumper jar etc., and construction workload is big, and operating cost is high, about straight well
Or directional well salvages 5 times of cost.
The various mating oil pipe falling preventing devices or oil pipe column dropping prevention anchor for being presently used for flow string are only capable of realizing normal oil recovery
Breaking in the process is de- anti-fall, and it is anti-fall but to cannot be guaranteed that tubing string breaking in lower brill, trip-out process takes off, and the anchoring of tool, unfreezing
Mechanism long period of soaking (oil well pump is hereinafter, all liq of mechanical oil recovery is intended to through the device) below liquid level, in fouling and
Under the influence of the factors such as corrosion, the flexibility of tool anchoring and unfreezing is significantly reduced, is especially not suitable in oil field level
Scale promotes and applies in well.
Invention content
The main purpose of the present invention is to provide a kind of disconnected well devices that falls off of the anti-flow string of oilfield horizontal well, to meet
To the requirement of the anti-breaking of oilfield horizontal well flow string under various operating modes.
The particular technique content of the present invention is as follows：
It is provided with counterweight accumulating mechanism, lubricating structure and auxiliary return mechanism in the present apparatus, using object weightlessness and accelerates
The physical features such as degree can protect well-equipped working environment, improve the sensitivity of tool without being bound by mechanical structure, can be
Salvage the light unfreezing of realization of disconnected de- tubing string.
To achieve the goals above, according to an aspect of the present invention, it is disconnected to provide a kind of anti-flow string of oilfield horizontal well
Fall off well device, including：Connecting rod；Top connection, top connection is fixedly connected on the upper end of connecting rod, and top connection has the conical surface
Slot；Slips, slips are movably disposed in connecting rod, and with the cone match of top connection；Counterweight accumulating mechanism, with connecting rod
Connection, for accumulating potential energy using gravity and driving slips to move for mechanical energy the potential energy of accumulation under state of weightlessness
It is dynamic.
Further, the disconnected well device that falls off of the anti-flow string of oilfield horizontal well includes：Slip spider, slip spider are movably set
It sets in connecting rod, slips setting is moved on slip spider, and with slip spider.
Further, counterweight accumulating mechanism includes：Clump weight, clump weight are connect with slip spider, and slip spider can be driven to move
It is dynamic；Counterweight spring, counterweight spring are located at below clump weight, and with clump weight Elastic Contact；Spring base, spring base are located at counterweight bullet
The lower section of spring, and contacted with counterweight spring.
Further, counterweight accumulating mechanism further includes：Connector, connector are fixedly connected on the lower end of connecting rod；Piston
Bar, piston rod are movably threaded through in the circumferential apertures of connector, and top and slip spider rigid contact, clump weight and piston rod
Lower end rigid contact, and slip spider is driven by piston rod.
Further, the disconnected well device that falls off of the anti-flow string of oilfield horizontal well further includes：Lower contact, lower contact are located at spring
The lower section of seat is simultaneously contacted with spring base；Throttle packing element, and throttling packing element is set in lower contact.
Further, the disconnected well device that falls off of the anti-flow string of oilfield horizontal well further includes：It is adjustable to adjust ring position for regulation ring
It saves land and is arranged in lower contact, to adjust the throttling degree of throttling packing element.
Further, the disconnected well device that falls off of the anti-flow string of oilfield horizontal well further includes：Outer barrel, outer barrel are set in connector
With outside lower contact, one end of outer barrel is fixedly connected on connector, and the other end is fixedly connected in lower contact.
Further, circumferential hole is provided on the circumferential surface of clump weight, being anchored in circumferential hole has the idler wheel being sleeved on straight pin.
Further, wearing bush is arranged with outside connecting rod, slip spider is arranged outside wearing bush.
Further, it is provided with boss on the peripheral wall of connecting rod, the stopper protrusion coordinated with boss is provided on slip spider,
Connector sleeve is also fixedly connected on slip spider, driving portion is connect with connector sleeve, and is drivingly connected set movement.
Further, it is provided with support protrusion on connector sleeve, resetting spring is provided between support protrusion and boss.
Tubing string is disconnected de- anti-fall when the internal weights accumulating mechanism of the present apparatus can realize oil recovery and in lower brill and trip-out process,
Ensure the extensive adaptability of device without being bound by mechanical structure using physical features such as weightlessness, acceleration.Profit inside device
Sliding mechanism can make its critical component work in good environment always, can extend its service life, and ensure long-term work can
By property.The sensitivity of tool can be changed by adjusting throttling packing element, device maximum rigid body outer diameter is smaller, reduces in the process of making a trip
The chance card machine rate of middle device itself improves the ability that tool adapts to pit shaft.Auxiliary return spring can match when salvaging disconnected de- tubing string
It closes and realizes light unfreezing, entire anchoring, unfreezing mechanism can realize unlimited subjob.The present invention can meet oilfield horizontal well oil recovery
The complicated operating mode of salvaging of the horizontal segment of disconnected de- tubing string is changed into straight well section by the disconnected de- requirement of anti-tubing string of the tubing string under various operating modes
Interior simple salvaging operating mode fundamentally changes the fishing process resolved after taking off, and can greatly reduce workload, and shortening accounts for well week
Phase saves operating expenses.
Description of the drawings
The accompanying drawings which form a part of this application are used to provide further understanding of the present invention, and of the invention shows
Meaning property embodiment and its explanation are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 shows the disconnected well schematic device that falls off of the anti-flow string of oilfield horizontal well according to an embodiment of the invention；
And
Fig. 2 shows A-A sectional views in Fig. 1；
Fig. 3 shows B-B sectional views in Fig. 1.
Wherein, above-mentioned attached drawing includes the following drawings label：
1, top connection；2, connecting rod；3, slips；4, wearing bush；5, slip spider；6, resetting spring；7, connector sleeve；8, piston
Bar；9, gasket；10, sealing ring；11, connector；12, outer barrel；13, clump weight；14, idler wheel；15, straight pin；16, counterweight bullet
Spring；17, spring base；18, sealing ring；19, lower contact；20, throttle packing element；21, regulation ring.
Specific implementation mode
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Below in conjunction with Fig. 1 to 3 and embodiment, the present invention is further described：
The present apparatus includes mainly top connection 1, connecting rod 2, slips 3, wearing bush 4, slip spider 5, resetting spring 6, connector sleeve
7, piston rod 8, gasket 9, sealing ring 10, connector 11, outer barrel 12, clump weight 13, idler wheel 14, straight pin 15, counterweight spring
16, spring base 17, sealing ring 18, lower contact 19, throttling packing element 20 and regulation ring 21；
It is set with wearing bush 4 above 2 outer wall step of connecting rod, is set with resetting spring 6 below step and supports the company of the spring
Female connector 7, slip spider 5 snap connection 2 step of bar and are connect with 7 upper port inner wall of connector sleeve, three dovetails on 1 outer wall of top connection
The slips 3 supported by slip spider 5 is equipped in slot, 2 top and bottom ends of connecting rod connect top connection 1 and connection by external screw thread respectively
First 11.Three piston rods 8 sealed by gasket 9 are longitudinally installed on connector 11, connector outer wall is connected through a screw thread by sealing
The outer barrel 12 of 10 sealing of circle, 12 bottom end of outer barrel connects lower contact 19 by internal thread.It is set with section outside 19 lower section reducing pipe of lower contact
Gummosis cylinder 20 and threaded connection regulation ring 21, it is that the support of 19 top surface of lower contact is sealed by sealing ring 18, suit counterweight spring 16
Spring base 17,17 top surface of spring base support the clump weight 13 of T-type, and anchoring is sleeved in four circumferential holes on 13 circumferential surface of clump weight
Idler wheel 14 on straight pin 15.
When assembling the present apparatus, three pieces slips 3 is inserted into along 1 dovetail groove of top connection first and is stuck in 5 card slot of slip spider, then will
The threaded upper ends for being set with the connecting rod 2 of wearing bush 4 connect top connection 1, again even after suit resetting spring 6 below connecting rod 2
Female connector 7 (due to the fit clearance very little between 7 inner circle of connector sleeve and connecting rod 2, once immerses oil well liquid level, which is
Can keep long-term closed, ensure the long-term reliability of resetting spring 6) it is threadedly coupled with slip spider 5.Gasket 9 is embedded in and is connected
Sealing ring 10 is sleeved on rear thread in 11 peripheral groove of connector and connects outer barrel 12 by first 11 axial hole.Straight pin 15 is penetrated into idler wheel
It is inserted into the anchoring of 13 circumferential direction Kong Bingyu clump weights 13 of clump weight after 14, covers upper counterweight spring 16 from 13 lower end of clump weight.With spring base
17 support clump weights 13, penetrate from 12 lower end of outer barrel, lower contact 19 are threadedly connected in outer barrel 12, by throttling packing element 20 under
19 lower end of connector is inserted in, and finally, regulation ring 21 is threadedly coupled lower contact 19.It is when work, lubricating oil is axial from connector 11
Hole pours into, until liquid level rises to 11 lower face of connector, three piston rods 8 are penetrated from 11 upper surface of connector, finally will even
2 lower end of extension bar is threadedly coupled with connector 11 can start to work normally.
When field application, the present apparatus is mounted on the bottom of flow string, and according to pit shaft situation, (old well is logical according to gauguste cutter
Well situation) adjustment regulation ring 21, the maximum outside diameter of control throttling packing element 20.Such as 51/2", internal diameter 124.26mm cased hole completions
Oil well, if Φ 116mm gauguste cutters can pass through, the maximum outside diameter for the packing element 20 that throttles is adjusted to 114mm.
The mechanism of present apparatus anti-breaking is as follows：
1, during making a trip (flow string enters pit shaft, but more than oil well liquid level)
If flow string is disconnected suddenly de-, clump weight 13 is weightless, at this point, the elastic force moment that counterweight spring 16 stores above pushes away and matches
Pouring weight 13, upper top piston rod 8 push connector sleeve 7 (compression reseting spring 6), slip spider 5, slips 3 along 1 slot inner conical surface of top connection
It moves up, slips 3 is made finally to be anchored on internal surface of sleeve pipe, and then prevent disconnected de- tubing string from continuing traveling downwardly.After the anchoring of slips 3, clump weight
13 come downwards to rigging position in the presence of its gravity.It is only 1m from disconnected suddenly take off to anchoring theoretical braking distance of flow string,
Therefore, the de- tubing string that breaks is smaller for the impact force of casing, can protection sleeve pipe well, meanwhile, break de- tubing string and the present apparatus itself
The impact force born also very little, will not be deformed and damage.
2, in normal oil recovery process or during making a trip (below oil well liquid level)
If flow string is disconnected suddenly de-, tubing string will present acceleration and move downward, and the liquid of the device lower part is made to move up, this
When, liquid is only capable of moving up with the annular section in casing by the packing element 20 that throttles, and fluid meets with the pressure loss, what which generated
Lifting force can moment push the spring seat 17 move up, and the thrust can rapidly increase with the speed that disconnected de- tubing string falls.It is same with this
When, clump weight 13 is weightless, and the elastic force that counterweight spring 16 stores also will produce lifting force and play collective effect, and piston is pushed up on clump weight 13
Bar 8 pushes connector sleeve 7 (compression reseting spring 6), slip spider 5, slips 3 to be moved up along 1 slot inner conical surface of top connection, keeps slips 3 final
It is anchored on internal surface of sleeve pipe, and then prevents disconnected de- tubing string from continuing traveling downwardly.After the anchoring of slips 3, effect of the clump weight 13 in its gravity
Under come downwards to rigging position, at the same time, spring base 17 is also pushed into rigging position by clump weight 13 by counterweight spring 16.From adopting
Disconnected suddenly take off to anchoring theoretical braking distance of tubing string is only 0.8m, and therefore, the de- tubing string that breaks is smaller for casing impact force, can be very
Protection sleeve pipe well, meanwhile, the impact force that disconnected de- tubing string and the present apparatus are born also very little itself will not be deformed and damage.
3, the salvaging and unfreezing in later stage
When the later stage needing to salvage disconnected de- tubing string, drags for disconnected de- tubing string fish head and above carry, 2 uplink of connecting rod, slot inner conical surface
Forced slip 3 is detached with internal surface of sleeve pipe, and at the same time, resetting spring 6 freely extends, and pushes connector sleeve 7 (while to push work successively
8 return of stopper rod) and slip spider 5 (pulling down slips 3), 3 return of final slips, present apparatus unfreezing power theory itself be not more than
10KN, disconnected de- tubing string can be pulled out smoothly.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of disconnected well device that falls off of anti-flow string of oilfield horizontal well, it is characterised in that：
It is provided with counterweight accumulating mechanism, lubricating structure and auxiliary return mechanism in the present apparatus, utilizes object weightlessness and acceleration object
Reason feature can protect well-equipped working environment, improve the sensitivity of tool without being bound by mechanical structure, can break salvaging
Light unfreezing is realized when de- tubing string；
Suit wearing bush (4) above present apparatus connecting rod (2) outer wall step, step lower section suit resetting spring (6) and support should
The connector sleeve (7) of spring, slip spider (5) are clamped with the step of connecting rod (2) and are connect with connector sleeve (7) upper port inner wall, on
The slips (3) supported by slip spider (5) is equipped in conical surface slot on connector (1) outer wall, connecting rod (2) top and bottom ends connect respectively
Connect connector (1) and connector (11)；The piston rod (8) sealed by gasket (9), outer barrel are longitudinally installed on connector (11)
(12) it is sealed by sealing ring (10), the outer wall of connector (11) connects the sealed outer cylinder (12), under the connection of outer barrel (12) bottom end
Connector (19)；Throttling packing element (20) and connection regulation ring (21), lower contact (19) top are set with below lower contact (19) outside reducing pipe
Spring base (17) that face support is sealed by sealing ring (18), suit counterweight spring (16), spring base (17) top surface supports counterweight
Block (13), in the circumferential hole on clump weight (13) circumferential surface anchoring have the idler wheel (14) being sleeved on straight pin (15).
2. a kind of disconnected well device that falls off of anti-flow string of oilfield horizontal well, which is characterized in that including：
Connecting rod (2)；
Top connection (1), the top connection (1) is fixedly connected on the upper end of the connecting rod (2), and the top connection (1) has
Conical surface slot；
Slips (3), the slips (3) are movably disposed in the connecting rod (2), and with the conical surface of the top connection (1)
Cooperation；
Counterweight accumulating mechanism is connect with the connecting rod (2), for that will be accumulated using gravity accumulation potential energy and under state of weightlessness
Potential energy drive the slips (3) mobile for mechanical energy；
Slip spider (5), the slip spider (5) are movably disposed in the connecting rod (2), and the slips (3) is arranged in institute
It states on slip spider (5), and mobile with the slip spider (5), the counterweight accumulating mechanism includes：
Clump weight (13), the clump weight (13) connect with the slip spider (5), and the slip spider (5) can be driven mobile；
Counterweight spring (16), the counterweight spring (16) are located at below the clump weight (13), and with the clump weight (13) bullet
Property contact；
Spring base (17), the spring base (17) are located at the lower section of the counterweight spring (16), and with the counterweight spring (16)
Elastic Contact；
Connector (11), the connector (11) are fixedly connected on the lower end of the connecting rod (2)；
Piston rod (8), the piston rod (8) is movably threaded through in the circumferential apertures of the connector (11), and top and institute
Slip spider (5) rigid contact, the lower end rigid contact of the clump weight (13) and the piston rod (8) are stated, and passes through the work
Stopper rod (8) drives the slip spider (5).
3. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 2, which is characterized in that the oil field
The disconnected well device that falls off of the anti-flow string of horizontal well further includes：
Lower contact (19), the lower contact (19) are located at the lower section of the spring base (17) and are contacted with the spring base (17)；
Throttle packing element (20), and the throttling packing element (20) is set in the lower contact (19).
4. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 3, which is characterized in that the oil field
The disconnected well device that falls off of the anti-flow string of horizontal well further includes：
Regulation ring (21) is arranged in the lower contact (19) to regulation ring (21) position-adjustable, to adjust the section
The throttling degree of gummosis cylinder (20).
5. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 3, which is characterized in that the oil field
The disconnected well device that falls off of the anti-flow string of horizontal well further includes：
Outer barrel (12), the outer barrel (12) are set in the connector (11) and the lower contact (19) outside, the outer barrel (12)
One end be fixedly connected on the connector (11), the other end is fixedly connected in the lower contact (19).
6. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 2, which is characterized in that the counterweight
Circumferential hole is provided on the circumferential surface of block (13), being anchored in the circumferential direction hole has the idler wheel (14) being sleeved on straight pin (15).
7. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 2, which is characterized in that the connection
Be arranged with wearing bush (4) outside bar (2), slip spider (5) setting the wearing bush (4) outside.
8. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 7, which is characterized in that the connection
It is provided with boss on the peripheral wall of bar (2), the stopper protrusion coordinated with the boss, the card are provided on the slip spider (5)
It is also fixedly connected with connector sleeve (7) on watt seat (5), driving portion is connect with the connector sleeve (7), and drives the connector sleeve (7)
Movement.
9. the disconnected well device that falls off of the anti-flow string of oilfield horizontal well according to claim 8, which is characterized in that the connection
It is provided with support protrusion on set (7), resetting spring (6) is provided between the support protrusion and the boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510219549.4A CN105089531B (en) | 2014-05-14 | 2015-05-01 | Oil field horizontal well oil production pipe string breaking and falling prevention well device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410204637 | 2014-05-14 | ||
| CN2014102046372 | 2014-05-14 | ||
| CN201510219549.4A CN105089531B (en) | 2014-05-14 | 2015-05-01 | Oil field horizontal well oil production pipe string breaking and falling prevention well device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105089531A CN105089531A (en) | 2015-11-25 |
| CN105089531B true CN105089531B (en) | 2018-09-04 |
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|---|---|---|---|
| CN201510219549.4A Active CN105089531B (en) | 2014-05-14 | 2015-05-01 | Oil field horizontal well oil production pipe string breaking and falling prevention well device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109763785B (en) * | 2019-03-28 | 2024-01-26 | 中曼石油天然气集团股份有限公司 | Hydraulic anchoring device for heavy-duty fishing tool and application method thereof |
| CN110173616A (en) * | 2019-05-05 | 2019-08-27 | 中国石油天然气股份有限公司 | Lubricating resistance-reducing fishing method for injection cylinder and underground choke |
| CN111946290B (en) * | 2020-10-09 | 2022-07-19 | 宜宾学院 | Coiled tubing prevents falling well device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205078208U (en) * | 2014-05-14 | 2016-03-09 | 中国石油天然气股份有限公司 | Oil field horizontal well oil production pipe string breaking and falling prevention well device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2466345Y (en) * | 2001-01-10 | 2001-12-19 | 李�杰 | Oil pipe falling preventing device |
| CN201083095Y (en) * | 2007-09-27 | 2008-07-09 | 于海涛 | Tubing string anti-falling anchor |
| CN104033118B (en) * | 2014-06-18 | 2017-02-15 | 金湖县支点石油科技有限责任公司 | Tool and method for preventing fall in well |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205078208U (en) * | 2014-05-14 | 2016-03-09 | 中国石油天然气股份有限公司 | Oil field horizontal well oil production pipe string breaking and falling prevention well device |
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