CN204532192U - Drilling rig is decomposed in a kind of wellheadpressure cutting - Google Patents

Drilling rig is decomposed in a kind of wellheadpressure cutting Download PDF

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Publication number
CN204532192U
CN204532192U CN201520046062.6U CN201520046062U CN204532192U CN 204532192 U CN204532192 U CN 204532192U CN 201520046062 U CN201520046062 U CN 201520046062U CN 204532192 U CN204532192 U CN 204532192U
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China
Prior art keywords
cutting
house
shell
rotating seat
wellheadpressure
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CN201520046062.6U
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Chinese (zh)
Inventor
刘毅
郭自新
魏克颖
任越飞
徐小建
曹晓敏
谭军
周建
康勇
李林清
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Petrochina Co Ltd
China Petroleum and Natural Gas Co Ltd
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China Petroleum and Natural Gas Co Ltd
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Priority to CN201520046062.6U priority Critical patent/CN204532192U/en
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Abstract

The utility model provides the cutting of a kind of wellheadpressure and decomposes drilling rig, comprise upper shell, lower house, the centre of upper shell and lower house arranges cutting chamber with one heart, oil pocket is provided with in lower house, bottom oil pocket, rotating seat is installed, rotating seat is connected with lower house by bearing, rotating seat is provided with knife rest, cutter head installed by knife rest, back-moving spring is connected with between knife rest and cutter head, driving shaft is connected with rotating seat by gear, upper shell is provided with pouring orifice B and water filling port A, cutting is provided with air ring around chamber, air ring is connected with water filling port A end, pouring orifice C and cutting chamber interface D is provided with bottom lower house, pouring orifice C two ends communicate with oil pocket and the external world respectively, cutting interface D two ends, chamber communicate with cutting chamber and the external world respectively.This device cuts technological principle according to cold cut, carries out hydraulic pressure cutting decompose at well head to drilling tool, solves drilling tool because of the large shackle difficulty of moment of torsion, and the difficult problem that during drilling tool seal fails, " release method " back-off operation cannot be implemented.

Description

Drilling rig is decomposed in a kind of wellheadpressure cutting
Technical field
The utility model belongs to gas well workover treatment technical field with pressure, is specifically related to the cutting of a kind of wellheadpressure and decomposes drilling rig.
Background technology
Along with Oil/gas Well Development life increases, there is tubing deformation in Soviet Union's Sulige gas field part gas well, restriction choke fault, testing tool fall the problems such as well in production maintenance process in pit shaft, affect gas well liquid loading.Due to " three the is low " characteristic in this gas field, adopt the conventional Well Killing well workover later stage to reproduce difficulty, formation can cause injury in various degree, and Sulige gas field of in recent years reviving introduces the workover treatment with pressure of well workover new technology-gas well.
Gas well well workover technology with pressure utilizes well-control equipment control well mouth pressure exactly, when no killing well, solve oil sets annular space dynamic seal (packing) and tubing string blowout prevention problem in construction operation process, overcome fluid matasomatism in the upper top power of tubing string, realize safety and play lower tubular column.This technology does not need kill-job, without the need to pressure release open flow, does not need to inject foreign liquid in well, effectively can keep reservoir pressure, non-contaminated oil gas-bearing formation, raising stablize individual well daily output, shorten operation construction period, effective increase gas well liquid loading time, saving kill-job material, is the important means reducing workover treatment integrated cost, improve recovery ratio.
But there is following shortcoming in the workover treatment with pressure of this gas well:
(1) current domestic introduction and research and development operation device under pressure due to cavity length with pressure limited, be only applicable to carry out workover treatment with pressure with the gas well of simple drilling assembly completion that list " seal ".
(2) " release method " back-off is adopted to play tubing string when breaking for restriction choke fishing neck in well the gas well workover treatment cannot salvaged or block and have other junk, this operational method has been bound round to Operating Pressure operating platform by oil pipe joint, first screw thread is loosened 1 ~ 2 circle with pipe wrench, then transfer tubing string and play flowline at Operating Pressure cavity back-off; If but below tubing string weight is comparatively large, and return in Operating Pressure cavity process transferring tubing string, dropout may occur and cause pipe column falling well or damage wellhead blowout preventor equivalent risk.
(3) Sulige gas field gas reservoir buried depth of reviving is distributed in 2000 ~ 4000m, vertical all kinds of reservoir is stacked alternately, many cover gassiness series of strata are generally grown in gas field, there is the feature of a well multilayer, adopt the drilling tool of multilayer separate pressure production production integration completion, achieved 11 layers of continuous mechanical separate stratum fracfturing at most at present, drilling tool is complicated, length is large, cannot trip out completion drilling tool during Operating Pressure well workover.
Utility model content
The purpose of this utility model overcomes above shortcomings in prior art, solves the problem of multilayer separate pressure production production integration completion tubular column Operating Pressure difficulty in natural gas well workover treatment with pressure.
For this reason, the utility model provides the cutting of a kind of wellheadpressure and decomposes drilling rig, comprise upper shell, lower house, knife rest, cutter head, back-moving spring, rotating seat, bearing, gear, driving shaft and air ring, the centre of described upper shell and lower house is provided with the cutting chamber for placing tubing string to be cut with one heart, oil pocket is provided with around cutting chamber in described lower house, the bottom of described oil pocket is provided with rotating seat, rotating seat is connected with lower house by bearing, described rotating seat is installed with knife rest, knife rest is provided with cutter head, back-moving spring is connected with between described knife rest and cutter head, described driving shaft is connected with rotating seat by gear through lower house side, described upper shell is provided with the pouring orifice B communicated with oil pocket top, described upper shell side is provided with water filling port A, water filling port A crosses upper shell, air ring is provided with around cutting chamber in described upper shell, described air ring is connected with water filling port A end, pouring orifice C and cutting chamber interface D is provided with bottom described lower house, described pouring orifice C one end communicates with bottom oil pocket, the other end communicates with the external world through lower house, one end of described cutting chamber interface D communicates with cutting chamber, the other end communicates with the external world through lower house.
Be bolted to connection between above-mentioned upper shell and lower house.
Above-mentioned cutter head is provided with wiper block.
Above-mentioned bearing is rolling bearing units.
Above-mentioned driving shaft is fixed by bolt and lower house.
Above-mentioned cutting chamber interface D is positioned at the below of pouring orifice C.
The beneficial effects of the utility model:
(1) this wellheadpressure cutting that the utility model provides is decomposed drilling rig and is cut technological principle according to cold cut, carry out hydraulic pressure cutting at well head to oil pipe or drilling tool when achieving the well workover with pressure of complicated drilling tool completion gas well to decompose, in conjunction with fishing tool, drilling tool is tripped out, reach the object of well workover with pressure.
(2) this wellheadpressure cutting that the utility model provides is decomposed drilling rig and is solved drilling tool because of the large shackle difficulty of moment of torsion, and the difficult problem that during drilling tool seal fails, " release method " back-off operation cannot be implemented, be complicated drilling tool well workover with pressure " sharp weapon ", decompose safer in cavity internal cutting.
(3) it is easy to operate that drilling rig is decomposed in this wellheadpressure cutting that the utility model provides, and has that otch is neat, chipless, oil pipe after cutting or drilling tool are easy to the feature that captures when cutting oil pipe or drilling tool.
Below with reference to accompanying drawing, the utility model is described in further details.
Accompanying drawing explanation
Fig. 1 is the structural representation that drilling rig is decomposed in the cutting of the utility model wellheadpressure.
Description of reference numerals: 1, upper shell; 2, lower house; 3, knife rest; 4, wiper block; 5, cutter head; 6, back-moving spring; 7, rotating seat; 8, bearing; 9, gear; 10, driving shaft; 11, air ring; 12, chamber is cut; 13, oil pocket.
Detailed description of the invention
Embodiment 1:
In order to overcome the deficiencies in the prior art, solve the problem of multilayer separate pressure production production integration completion tubular column Operating Pressure difficulty in natural gas well workover treatment with pressure, present embodiments provide a kind of wellheadpressure cutting as shown in Figure 1 and decompose drilling rig, comprise upper shell 1, lower house 2, knife rest 3, cutter head 5, back-moving spring 6, rotating seat 7, bearing 8, gear 9, driving shaft 10 and air ring 11, the centre of described upper shell 1 and lower house 2 is provided with the cutting chamber 12 for placing tubing string to be cut with one heart, oil pocket 13 is provided with around cutting chamber 12 in described lower house 2, the bottom of described oil pocket 13 is provided with rotating seat 7, rotating seat 7 is connected with lower house 2 by bearing 8, described rotating seat 7 is installed with knife rest 3, knife rest 3 is provided with cutter head 5, back-moving spring 6 is connected with between described knife rest 3 and cutter head 5, described driving shaft 10 is connected with rotating seat 7 by gear 9 through lower house 2 side, described upper shell 1 is provided with the pouring orifice B communicated with oil pocket 13 top, described upper shell 1 side is provided with water filling port A, water filling port A crosses upper shell 1, air ring 11 is provided with around cutting chamber 12 in described upper shell 1, described air ring 11 is connected with water filling port A end, pouring orifice C and cutting chamber interface D is provided with bottom described lower house 2, described pouring orifice C one end communicates with bottom oil pocket 13, the other end communicates with the external world through lower house 2, one end of described cutting chamber interface D communicates with cutting chamber 12, the other end communicates with the external world through lower house 2.
The technical data that drilling rig is decomposed in this wellheadpressure cutting that the present embodiment provides is as shown in table 1.
Table 1:
Sequence number Title Design parameters
1 Pressure-bearing grade 35MPa
2 Operating pressure 14MPa
3 Inside nominal diameter 180mm
4 Be suitable for tubing size 2 3/ 8 ,2 7/ 8 ,3 1/ 2
5 Activity duration 30min
During use, the oil pipe decompose required cutting or drilling tool are vertically placed in cutting chamber 12, the external hydraulic line of pouring orifice B, hydraulic line installs four-way, a termination pressure meter of four-way, one termination relief valve, one end connects one-way quick connector, from one-way quick connector to injection liquid force feed in oil pocket 13, makes to be full of hydraulic oil in oil pocket 13, because the pressure in oil pocket 13 is greater than the pressure in cutting chamber 12, thus cutter head 5 is driven to be close to oil pipe to be cut or drilling tool.
On the other hand, described gear 9 is external gear, the horizontal component of external gear is connected with rotating seat 7, the vertical component of external gear is connected with driving shaft 10, rotated along oil pipe or drilling tool circumference at horizontal plane by gear 9 driven rotary seat 7 when driving shaft 10 rotates on vertical plane, thus the cutter head 5 on driven rotary seat 7 also rotates along the circumference of oil pipe or drilling tool; Controlled the radial displacement of cutter head 5 simultaneously by the pressure reduction controlled between pouring orifice C and cutting chamber interface D, realize the object that cutter head 5 radially does circumferential movement cutting oil pipe or drilling tool.
In cutting process, from water filling port A, inject cooling fluid, cooling fluid is sprayed on the oil pipe cut or drilling tool and cutter head 5 by air ring 11, realizes refrigerating function, reaches the object that cold cut is cut.
After cutting completes, release the pressure in oil pocket 13 from the relief valve of pouring orifice B end, reset under the pressure effect of cutter head 5 in back-moving spring 6 and cutting chamber 12, complete and once cut.
This wellheadpressure cutting that the present embodiment provides is decomposed drilling rig and is cut technological principle according to cold cut, carry out hydraulic pressure cutting at well head to oil pipe or drilling tool when achieving the well workover with pressure of complicated drilling tool completion gas well to decompose, in conjunction with fishing tool, drilling tool is tripped out, reach the object of well workover with pressure, solve drilling tool because of the large shackle difficulty of moment of torsion simultaneously, and the difficult problem that during drilling tool seal fails, " release method " back-off operation cannot be implemented, be complicated drilling tool well workover with pressure " sharp weapon ", decompose safer in cavity internal cutting; In addition, this device is easy to operate, has that otch is neat, chipless, oil pipe after cutting or drilling tool are easy to the feature that captures when cutting oil pipe or drilling tool.
Embodiment 2:
On the basis of embodiment 1, be bolted to connection between described upper shell 1 and lower house 2, described driving shaft 10 is also fixed by bolt and lower house 2 simultaneously.Described bearing 8 is rolling bearing units.
In order to make cutter head 5 not offset in cutting process, make the oil pipe that cuts or drilling mouth neat, described cutter head 5 is provided with wiper block 4.
And described cutting chamber interface D is positioned at the below of pouring orifice C.
This wellheadpressure cutting that the utility model provides decomposes drilling rig according to " cold cut is cut " technological principle, the basis of single cutter in the past is creatively set up righting, fixing, reset, hydraulic gear, feature in conjunction with Operating Pressure devises the housing of energy pressure-bearing, through structure optimization, fit together ingenious for each parts in an orderly manner, structure is simple, easy to operate.
More than exemplifying is only illustrate of the present utility model, does not form the restriction to protection domain of the present utility model, everyly all belongs within protection scope of the present invention with the same or analogous design of the utility model.

Claims (6)

1. drilling rig is decomposed in a wellheadpressure cutting, it is characterized in that: comprise upper shell (1), lower house (2), knife rest (3), cutter head (5), back-moving spring (6), rotating seat (7), bearing (8), gear (9), driving shaft (10) and air ring (11), the centre of described upper shell (1) and lower house (2) is provided with the cutting chamber (12) for placing tubing string to be cut with one heart, cutting chamber (12) in described lower house (2) is provided with oil pocket (13) around, the bottom of described oil pocket (13) is provided with rotating seat (7), rotating seat (7) is connected with lower house (2) by bearing (8), described rotating seat (7) is installed with knife rest (3), knife rest (3) is provided with cutter head (5), back-moving spring (6) is connected with between described knife rest (3) and cutter head (5), described driving shaft (10) is connected with rotating seat (7) by gear (9) through lower house (2) side, described upper shell (1) is provided with the pouring orifice B communicated with oil pocket (13) top, described upper shell (1) side is provided with water filling port A, water filling port A crosses upper shell (1), cutting chamber (12) in described upper shell (1) is provided with air ring (11) around, described air ring (11) is connected with water filling port A end, described lower house (2) bottom is provided with pouring orifice C and cutting chamber interface D, described pouring orifice C one end communicates with oil pocket (13) bottom, the other end communicates with the external world through lower house (2), one end of described cutting chamber interface D communicates with cutting chamber (12), the other end communicates with the external world through lower house (2).
2. drilling rig is decomposed in wellheadpressure cutting as claimed in claim 1, it is characterized in that: be bolted to connection between described upper shell (1) and lower house (2).
3. drilling rig is decomposed in wellheadpressure cutting as claimed in claim 1, it is characterized in that: described cutter head (5) is provided with wiper block (4).
4. drilling rig is decomposed in wellheadpressure cutting as claimed in claim 1, it is characterized in that: described bearing (8) is rolling bearing units.
5. drilling rig is decomposed in wellheadpressure cutting as claimed in claim 1, it is characterized in that: described driving shaft (10) is fixed by bolt and lower house (2).
6. drilling rig is decomposed in wellheadpressure cutting as claimed in claim 1, it is characterized in that: described cutting chamber interface D is positioned at the below of pouring orifice C.
CN201520046062.6U 2015-01-23 2015-01-23 Drilling rig is decomposed in a kind of wellheadpressure cutting Active CN204532192U (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108104761A (en) * 2018-01-17 2018-06-01 宋协翠 For the application method of the circular cutout device of four ram preventer of coiled tubing
CN108286419A (en) * 2018-01-17 2018-07-17 宋协翠 A kind of circular cutout device for four ram preventer of coiled tubing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108104761A (en) * 2018-01-17 2018-06-01 宋协翠 For the application method of the circular cutout device of four ram preventer of coiled tubing
CN108286419A (en) * 2018-01-17 2018-07-17 宋协翠 A kind of circular cutout device for four ram preventer of coiled tubing
CN108104761B (en) * 2018-01-17 2020-06-23 东营市元捷石油机械有限公司 Using method of circular shearing device for coiled tubing four-ram blowout preventer

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