CN107780875A - Blanking plug - Google Patents

Blanking plug Download PDF

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Publication number
CN107780875A
CN107780875A CN201610757692.3A CN201610757692A CN107780875A CN 107780875 A CN107780875 A CN 107780875A CN 201610757692 A CN201610757692 A CN 201610757692A CN 107780875 A CN107780875 A CN 107780875A
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CN
China
Prior art keywords
setting
piston
blanking plug
valve
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201610757692.3A
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Chinese (zh)
Other versions
CN107780875B (en
Inventor
张康卫
袁龙
彭军
戴国彬
罗永庆
张宏峰
苏明锁
姜艳
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Petrochina Co Ltd
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Petrochina Co Ltd
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Publication date
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Priority to CN201610757692.3A priority Critical patent/CN107780875B/en
Publication of CN107780875A publication Critical patent/CN107780875A/en
Application granted granted Critical
Publication of CN107780875B publication Critical patent/CN107780875B/en
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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/128Packers; Plugs with a member expanded radially by axial pressure
    • E21B33/1285Packers; Plugs with a member expanded radially by axial pressure by fluid pressure
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/10Valve arrangements in drilling-fluid circulation systems
    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21BEARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/12Packers; Plugs
    • E21B33/1208Packers; Plugs characterised by the construction of the sealing or packing means

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Pipe Accessories (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Abstract

The invention discloses a blanking plug, and belongs to the technical field of well repair operation. The blanking plug comprises: the device comprises a blocking cylinder mechanism, a seat sealing mechanism, a slide valve mechanism and a limiting mechanism; the blocking cylinder mechanism is connected with the seat sealing mechanism, the sliding valve mechanism is connected with the limiting mechanism, the limiting mechanism is connected with the blocking cylinder mechanism, the sliding valve mechanism is located inside the limiting mechanism, and the sliding valve mechanism and the limiting mechanism are located at the lower end of the seat sealing mechanism. According to the invention, the pressure energy provided by external equipment is converted into mechanical energy through the plugging cylinder mechanism in the plug, the seat sealing mechanism is compressed, the seat sealing mechanism seals the Christmas tree tubing hanger under the action of the plugging cylinder mechanism and the limiting mechanism, and the circulating well washing channel is established through the slide valve mechanism, so that the problems that the Christmas tree tubing hanger is not sealed and the circulating well washing cannot be carried out are solved.

Description

A kind of blanking plug
Technical field
The present invention relates to workover treatment technical field, more particularly to a kind of blanking plug.
Background technology
Workover treatment is that the important means that oil, gas and water well normally produce is kept in oilfield development process.In workover treatment In, generally require well-flushing.
At present, during Oil, Water, Gas well workover treatment, generally require to carry out circulation well cleanup, and circulation well cleanup is usually After working solution is injected into well by production tree oil pipe, working solution is in production tree oil pipe internal circulation flow.
Due to general blow-by at production tree tubing hanger, working solution is directly from production tree tubing hanger when can cause to circulate Place overflows, and causes working solution circulation short circuit, causes circulation well cleanup operation not reach assignment requirement.Therefore, in order in well-flushing When establish annular seal space in production tree oil pipe, working solution through production tree oil pipe is recycled to well head, it is necessary to which a kind of sealing is set It is standby that production tree tubing hanger is sealed.
The content of the invention
In order to solve problem of the prior art, the embodiments of the invention provide a kind of blanking plug.The technical scheme is as follows:
On the one hand, there is provided a kind of blanking plug, the blanking plug include:Block cylinder mechanism, setting mechanism, slide-valve gear and Position-limit mechanism;
The blocking cylinder mechanism is connected with the setting mechanism, and the blocking cylinder mechanism is used in well-flushing, and outside is set The standby pressure energy provided is converted into mechanical energy, and the setting mechanism is used to carry out by the mechanical energy that the blocking cylinder mechanism provides It is setting, to be sealed to production tree tubing hanger;
The slide-valve gear is connected with the position-limit mechanism, and the position-limit mechanism is connected with the blocking cylinder mechanism, described Slide-valve gear is located inside the position-limit mechanism, and the slide-valve gear and the position-limit mechanism are located under the setting mechanism End, the one end blocked described in the blanking plug residing for cylinder mechanism is upper end, and one end residing for the position-limit mechanism is lower end, The position-limit mechanism is used for the position for limiting the setting mechanism, and the slide-valve gear is used to open the blanking plug and production tree Passage between oil pipe establishes circulation well cleanup passage.
Alternatively, the blocking cylinder mechanism includes:Stroke cylinder, push piston, telescoping tube, cylinder pressure, setting piston, central tube With piston snap;
The piston that pushes is connected with one end of the telescoping tube, and is inserted in the stroke cylinder;
The other end of the telescoping tube is connected with one end of the central tube, one end of the central tube also with the cylinder pressure Connection, and be connected between the setting piston by setting shear pin, the setting piston is also connected with the piston snap, The other end of the central tube is connected with the position-limit mechanism, to pass through the stroke cylinder, the piston, described flexible of pushing The annular seal space that pipe, the cylinder pressure, the setting piston, the central tube, the slide-valve gear and the position-limit mechanism are formed, The pressure energy that external equipment is provided is converted into mechanical energy.
Alternatively, the setting mechanism includes:At least two packing elements, at least one pressure ring and pressure cap;
At least two packing element, at least one pressure ring and the pressure cap are sequentially arranged at the blocking cylinder mechanism On, and at least one pressure ring is located between the packing element that any two is adjacent at least two packing element, the pressure cap position In the lower end of at least two packing element, under the cooperation of the pressure ring and the pressure cap, to compress institute by the setting piston State packing element, and the expansion after being compressed by the packing element carry out it is setting.
Alternatively, the slide-valve gear includes:Guiding valve, valve pocket, steel ball and guiding valve snap;
The steel ball is placed in the valve pocket, and the valve pocket is connected with the guiding valve, the guiding valve snap respectively, the valve Set is also connected by guiding valve shear pin with the position-limit mechanism.
Alternatively, the position-limit mechanism includes:Stop collar and deck;
One end of the stop collar is connected with the other end of the central tube, and with the lower end in contact of the setting mechanism, To limit the position of the setting mechanism;
The other end of the stop collar is connected with the deck, and the stop collar also passes through guiding valve shear pin and the guiding valve machine Structure connects.
Alternatively, the blanking plug also includes well head joint;
One end of the well head joint is connected with the lower end of the stroke cylinder, and the well head joint and the stroke cylinder are same Axle, for connecting the blanking plug and the production tree oil pipe.
On the other hand, there is provided a kind of blanking plug provided based on first aspect is sealed to production tree tubing hanger Method, methods described includes:
After the blanking plug is placed in production tree oil pipe, external equipment is provided by blocking cylinder mechanism pressure energy Be converted to mechanical energy;
Restriction of the mechanical energy and position-limit mechanism provided by the blocking cylinder mechanism to setting mechanism position, to the seat Sealing mechanism is compressed, to seal the production tree tubing hanger;
After the setting mechanism is setting, the passage between the blanking plug and production tree oil pipe is opened by slide-valve gear To establish circulation well cleanup passage.
Alternatively, the limit of the mechanical energy provided by the blocking cylinder mechanism and position-limit mechanism to setting mechanism position It is fixed, the setting mechanism is compressed, including:
The mechanical energy provided by the blocking cylinder mechanism, promoted by the steel ball push piston, telescoping tube, cylinder pressure, Setting piston, piston snap, central tube, at least two packing elements, at least one pressure ring, pressure cap, stop collar, deck, guiding valve, valve pocket It is descending together with guiding valve snap;
When come downwards to it is described push the shoulder position of piston when, the setting piston continues under the driving of the mechanical energy Descending, setting shear pin is cut;
After the setting shear pin is cut, at least two packing element is compressed by the setting piston, make it is described extremely Few two packing elements expansion is setting to complete, and the shoulder position for pushing piston is the position in the well head upper end of joint face.
Alternatively, it is described that passage between the blanking plug and production tree oil pipe is opened to establish circulation by slide-valve gear Well-flushing passage, including:
Guiding valve and valve pocket is promoted to continue traveling downwardly by the steel ball, to cut between the guiding valve and the position-limit mechanism Guiding valve shear pin;
After guiding valve shear pin cutting, the formation passage between the blanking plug and the production tree oil pipe, to build Vertical circulation well cleanup passage.
The beneficial effect that technical scheme provided in an embodiment of the present invention is brought is:
In embodiments of the present invention, the pressure energy provided external equipment by the blocking cylinder mechanism in blanking plug is converted into Mechanical energy, compression mount sealing mechanism, setting mechanism are carried out in the presence of cylinder mechanism and position-limit mechanism is blocked to production tree tubing hanger Sealing, establishes circulation well cleanup passage by slide-valve gear, solves production tree tubing hanger blow-by, can not carry out circulation well cleanup Problem.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, make required in being described below to embodiment Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for For those of ordinary skill in the art, on the premise of not paying creative work, other can also be obtained according to these accompanying drawings Accompanying drawing.
Fig. 1 is a kind of schematic diagram for blanking plug that an illustrative examples of the invention provide;
Fig. 2 is a kind of schematic diagram for blocking cylinder mechanism that an illustrative examples of the invention provide;
Fig. 3 is a kind of schematic diagram for setting mechanism that an illustrative examples of the invention provide;
Fig. 4 is a kind of schematic diagram for slide-valve gear that an illustrative examples of the invention provide;
Fig. 5 is a kind of schematic diagram for position-limit mechanism that an illustrative examples of the invention provide;
Fig. 6 is that the state of slide-valve gear when another blanking plug passage that an illustrative examples of the invention provide is opened is shown It is intended to;
Fig. 7 is the schematic diagram for another blanking plug that an illustrative examples of the invention provide;
Fig. 8 be according to an exemplary embodiment it is a kind of based on blanking plug provided in an embodiment of the present invention to recover the oil The method flow diagram that tree tubing hanger is sealed;
Fig. 9 be according to an exemplary embodiment another kind based on blanking plug provided in an embodiment of the present invention to adopting The method flow diagram that oil tree tubing hanger is sealed.
Wherein, it is as follows to each label declaration in accompanying drawing:
1 blocking cylinder mechanism, 11 stroke cylinders, 12 push piston, 13 telescoping tubes, 14 cylinder pressures, 15 setting pistons, 16 central tubes, 17 piston snaps, 2 setting mechanisms, 21 packing elements, 22 pressure rings, 23 pressure caps, 3, slide-valve gear, 31 guiding valves, 32 valve pockets, 33 steel balls, 34 Guiding valve snap, 4 position-limit mechanisms, 41 stop collars, 42 decks, 5 well head joints.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing to embodiment party of the present invention Formula is described in further detail.
Fig. 1 is a kind of schematic diagram of blanking plug according to an exemplary embodiment, as shown in figure 1, blanking plug includes: Block cylinder mechanism 1, setting mechanism 2, slide-valve gear 3 and position-limit mechanism 4;
Block cylinder mechanism 1 to be connected with setting mechanism 2, block cylinder mechanism 1 and be used in well-flushing, the pressure that external equipment is provided Power can be converted into mechanical energy, and the mechanical energy progress that setting mechanism 2 is used for by blocking the offer of cylinder mechanism 1 is setting, with to production tree Tubing hanger is sealed;
Slide-valve gear 3 is connected with position-limit mechanism 4, and position-limit mechanism 4 is connected with blocking cylinder mechanism 1, and slide-valve gear 3 is positioned at spacing Inside mechanism 4, and slide-valve gear 3 and position-limit mechanism 4 are located at the lower end of setting mechanism 2, are blocked in blanking plug residing for cylinder mechanism 1 One end be upper end, one end residing for position-limit mechanism 4 is lower end, and position-limit mechanism 4 is used for the position for limiting setting mechanism, guiding valve machine Structure 3 is used to open the passage between blanking plug and production tree oil pipe to establish circulation well cleanup passage.
In embodiments of the present invention, the pressure energy provided external equipment by the blocking cylinder mechanism in blanking plug is converted into Mechanical energy, compression mount sealing mechanism, setting mechanism are carried out in the presence of cylinder mechanism and position-limit mechanism is blocked to production tree tubing hanger Sealing, establishes circulation well cleanup passage by slide-valve gear, solves production tree tubing hanger blow-by, can not carry out circulation well cleanup Problem.
Wherein, setting mechanism 2, which is enclosed on, blocks in cylinder mechanism 1, is positioned by position-limit mechanism 4, slide-valve gear 3 is placed in spacing In mechanism 4, it is connected through a screw thread, and squeezes into shear pin and fix, position-limit mechanism 4 is connected through a screw thread with blocking cylinder mechanism 1, and is squeezed into Pin is fixed.
Illustratively, during blanking plug work provided in an embodiment of the present invention, external equipment pressurizes to blanking plug inner chamber, blocks cylinder The pressure energy that mechanism 1 provides external equipment is converted into mechanical energy, compression mount sealing mechanism, complete it is setting, afterwards external equipment after Continuous pressurization, the guiding valve shear pin for connecting slide-valve gear 3 and position-limit mechanism 4 are cut, and the spiral of slide-valve gear 3 is descending, when guiding valve machine When structure 3 comes downwards to the bottom of position-limit mechanism 4, slide-valve gear 3 stops descending, and the passage between blanking plug and production tree oil pipe is beaten Open, establish circulation well cleanup passage.
Fig. 2 is a kind of schematic diagram of blocking cylinder mechanism 1 according to an exemplary embodiment, as shown in Fig. 2 blocking cylinder Mechanism includes:Stroke cylinder 11, push piston 12, telescoping tube 13, cylinder pressure 14, setting piston 15, central tube 16 and piston snap 17;
One end that piston 12 is pushed with telescoping tube 13 is connected, and is inserted in stroke cylinder 11;
The other end of telescoping tube 13 is connected with one end of central tube 16, and one end of central tube 16 is also connected with cylinder pressure 14, with And be connected between setting piston 15 by setting shear pin, setting piston 15 is also connected with piston snap 17, central tube 16 it is another One end is connected with position-limit mechanism, with by stroke cylinder 11, push piston 12, telescoping tube 13, cylinder pressure 14, setting piston 15, center The annular seal space that pipe 16, slide-valve gear 3 and position-limit mechanism 4 are formed, the pressure energy that external equipment is provided are converted into mechanical energy.
Wherein, the one end for pushing piston 12 and telescoping tube 13 is connected through a screw thread, and is squeezed into pin and fixed.Telescoping tube 13 One end of the other end and central tube 16 be connected through a screw thread, and squeeze into pin and fix, one end of central tube 16 also with cylinder pressure 14 Connection, connected mode is threaded connection, and squeezes into pin and fix, and central tube 16 also connects with setting piston 15, and connected mode is Threaded connection, connection screw thread is left-handed anti-back screw thread, and squeezes into setting shear pin and fix.Certainly, in actual applications, cylinder machine is blocked Parts in structure also have other connected modes, and the embodiment of the present invention is not especially limited to this.
Illustratively, stroke cylinder 11, push piston 12, telescoping tube 13, cylinder pressure 14, setting piston 15, central tube 16, guiding valve machine The annular seal space that structure 3 and position-limit mechanism 4 are formed, when external equipment pressurizes to blanking plug, the pressure energy that external equipment is provided turns Turn to mechanical energy, promotion pushes piston 12, telescoping tube 13, cylinder pressure 14, setting piston 15, central tube 16, piston snap 17, setting Mechanism 2, slide-valve gear 3 and position-limit mechanism 4 are descending together, when push piston 12 come downwards to push piston land when, push piston 12nd, under telescoping tube 13, cylinder pressure 14, central tube 16, piston snap 17, setting mechanism 2, slide-valve gear 3 and position-limit mechanism 4 stop OK, external equipment persistent pressure, the setting shear pin for connecting central tube 16 and setting piston 15 is cut, under the setting spiral of piston 15 OK, compression mount sealing mechanism 2, carry out setting.
Fig. 3 is a kind of schematic diagram of setting mechanism 2 according to an exemplary embodiment, as shown in figure 3, setting mechanism Including:Packing element 21, pressure ring 22 and pressure cap 23;
Packing element 21, pressure ring 22 and pressure cap 23, which are sequentially arranged at, to be blocked in cylinder mechanism, and to be located at any two adjacent for pressure ring 22 Packing element 21 between, pressure cap 23 is located at the lower end of packing element 21, under the cooperation of pressure ring 22 and pressure cap 23, to be pressed by setting piston 15 Contracting packing element 21, and the expansion after being compressed by packing element 21 carry out it is setting.
It should be noted that the mounting means of packing element 21, pressure ring 22 and pressure cap 23 as shown in figure 1, be inserted in blocking cylinder successively On central tube 16 in mechanism, and by set piston 15 and position-limit mechanism 4 carry out it is spacing.The number of packing element 21 in setting mechanism Amount at least two, the quantity of pressure ring 22 is at least one, it is preferable that the quantity of the packing element 21 in setting mechanism is three, pressure The quantity of ring 22 is two.
Illustratively, after setting shear pin is cut, the setting spiral of piston 15 is descending, in pressure ring 22, pressure cap 23 and position-limit mechanism 4 In the presence of, setting piston 15 compresses packing element 21, and packing element 21 expands after being compressed, contacted with production tree tube inner wall, to recovering the oil Tree tubing hanger is sealed, and piston snap 17 is worked after the completion of sealing, and setting piston 15 is locked in into current location, setting completion.
Fig. 4 is a kind of schematic diagram of slide-valve gear 3 according to an exemplary embodiment, as shown in figure 4, slide-valve gear Including:Guiding valve 31, valve pocket 32, steel ball 33 and guiding valve snap 34;
Steel ball 33 is placed in valve pocket 32, and valve pocket 32 is connected with guiding valve 31, guiding valve snap 34 respectively, and valve pocket 32 is gone back and position restrainer Structure 4 connects.
Wherein, valve pocket 32 and guiding valve 31 are connected through a screw thread, and are squeezed into pin and fixed, and guiding valve snap 34 is placed on valve pocket 32 On, valve pocket 32 is connected through a screw thread with position-limit mechanism 4, and connection screw thread is left-handed anti-back screw thread, and squeezes into guiding valve shear pin and fix.When So, in actual applications, the parts in slide-valve gear also have other connected modes, and the embodiment of the present invention is not made specifically to this Limit.
Fig. 5 is a kind of schematic diagram of position-limit mechanism according to an exemplary embodiment, as shown in figure 5, position-limit mechanism Including:Stop collar 41 and deck 42;
One end of stop collar 41 is connected with the other end of central tube 16, and with the lower end in contact of setting mechanism 2, to limit seat The position of sealing mechanism 2;
The other end of stop collar 41 is connected with deck 42, and stop collar 41 is also connected by guiding valve shear pin with valve pocket 32.
Wherein, one end of stop collar 41 is to be threadedly coupled with the connected mode of the other end of central tube 16, and squeezes into pin Fixed, the other end of stop collar 41 is to be threadedly coupled with the connected mode of deck 42, and squeezes into shear pin and fix, stop collar 41 and valve Set 32 is connected through a screw thread, and connection screw thread is left-handed anti-back screw thread, and squeezes into guiding valve shear pin and fix.Certainly, in actual applications, Parts in position-limit mechanism 4 also have other connected modes, and the embodiment of the present invention is not especially limited to this.
Illustratively, after the completion of setting, external equipment continues to pressurize to blanking plug, is now used for fixing valve pocket 32 and stop collar 41 guiding valve shear pin is cut, and the spiral of slide-valve gear 4 is descending, when the bottom of valve pocket 32 touches the upper surface of deck 42, is stopped Descending, guiding valve snap 34 is worked, and slide-valve gear 3 is locked in into current location, as shown in fig. 6, between blanking plug and production tree oil pipe Passage open.So far, the sealing of production tree tubing hanger and circulation well cleanup Path Setup are completed, during circulation well cleanup, well-flushing working solution Injected from well head, by the stroke cylinder 11 in blanking plug, telescoping tube 13, central tube 16 and stop collar 41, pass through the side of stop collar 41 Hole on wall enters oil pipe, carries out circulation well cleanup.
Further, as shown in fig. 7, blanking plug also includes well head joint 5;
One end of well head joint 5 is connected with the lower end of stroke cylinder 11, and well head joint 5 and stroke cylinder 11 are coaxial, for even Connect blanking plug and production tree oil pipe.
Wherein, one end of well head joint 5 is connected with the connected mode of the lower end of stroke cylinder 11 for pin, certainly, actual to answer In, one end of well head joint 5 can also be attached with the lower end of stroke cylinder 11 by other connected modes, and the present invention is real Applying example is illustrated so that pin connects as an example, this is not limited specifically.
It should be noted that in embodiments of the present invention, stroke cylinder 11 and push piston 12, push piston 12 and telescoping tube 13rd, telescoping tube 13 and well head joint 5, telescoping tube 13 and central tube 16, cylinder pressure 14 and setting piston 15, setting piston 15 and center Junction between pipe 16, central tube 16 and stop collar 41, stop collar 41 and guiding valve 31, guiding valve 31 and valve pocket 32 can install There is sealing ring, the sealing ring can seal to each connecting portion.
In embodiments of the present invention, the pressure energy provided external equipment by the blocking cylinder mechanism in blanking plug is converted into Mechanical energy, compression mount sealing mechanism, setting mechanism are carried out in the presence of cylinder mechanism and position-limit mechanism is blocked to production tree tubing hanger Sealing, establishes circulation well cleanup passage by slide-valve gear, solves production tree tubing hanger blow-by, can not carry out circulation well cleanup Problem.
Fig. 8 be according to an exemplary embodiment it is a kind of based on blanking plug provided in an embodiment of the present invention to recover the oil The method flow diagram that tree tubing hanger is sealed, as shown in figure 8, this method includes:
Step 801:After blanking plug is placed in production tree oil pipe, external equipment is provided by blocking cylinder mechanism pressure Power can be converted to mechanical energy.
Step 802:By blocking the restriction of the mechanical energy and position-limit mechanism of the offer of cylinder mechanism to setting mechanism position, to seat Sealing mechanism is compressed, to seal production tree tubing hanger.
Step 803:After present sealing mechanism is setting, the passage between blanking plug and production tree oil pipe is opened by slide-valve gear To establish circulation well cleanup passage.
In embodiments of the present invention, the pressure energy provided external equipment by the blocking cylinder mechanism in blanking plug is converted into Mechanical energy, compression mount sealing mechanism, setting mechanism are carried out in the presence of cylinder mechanism and position-limit mechanism is blocked to production tree tubing hanger Sealing, establishes circulation well cleanup passage by slide-valve gear, solves production tree tubing hanger blow-by, can not carry out circulation well cleanup Problem.
Fig. 9 be according to an exemplary embodiment another kind based on blanking plug provided in an embodiment of the present invention to adopting The method flow diagram that oil tree tubing hanger is sealed, as shown in figure 9, this method includes:
Step 901:After blanking plug is placed in production tree oil pipe, external equipment is provided by blocking cylinder mechanism pressure Power can be converted into mechanical energy.
For example the pressure energy that external equipment provides can be realized by injecting highly pressurised liquid into blanking plug, high pressure Pressure energy entrained by liquid is mechanical energy by blocking cylinder organisation conversion, driving blanking plug work.
Step 902:By block cylinder mechanism provide mechanical energy, by steel ball promote push piston, telescoping tube, cylinder pressure, Setting piston, piston snap, central tube, at least two packing elements, at least one pressure ring, pressure cap, stop collar, deck, guiding valve, valve pocket It is descending together with guiding valve snap.
As shown in fig. 7, the diameter of steel ball be more than valve pocket endoporus diameter, steel ball and stroke cylinder, push piston, telescoping tube, Central tube, setting piston, guiding valve, valve pocket, stop collar composition annular seal space, external equipment pressurize when, steel ball promote push piston, Telescoping tube, cylinder pressure, setting piston, piston snap, central tube, at least two packing elements, at least one pressure ring, pressure cap, stop collar, cunning Valve, valve pocket and guiding valve snap are descending together.Wherein, steel ball pushes directly on descending for valve pocket, and valve pocket connects with guiding valve, stop collar again Connect, stop collar is connected with deck, central tube again, and central tube is connected with setting piston, cylinder pressure, telescoping tube again, and telescoping tube is again with Piston connection is pressed, promotes at least two packing elements, at least one pressure ring and pressure cap descending during setting descent of piston.
Step 903:When coming downwards to the shoulder position for pushing piston, under setting piston continues under the driving of mechanical energy OK, setting shear pin is cut.
When coming downwards to the shoulder position for pushing piston, well head joint will push stuck piston, steel ball, push piston, be flexible Pipe, cylinder pressure, setting piston, piston snap, central tube, at least two packing elements, at least one pressure ring, pressure cap, stop collar, guiding valve, Valve pocket and the stopping of guiding valve snap are descending, and external equipment continues to pressurize to blanking plug, and the shear stress that setting shear pin is born is gradual Increase, when the shear stress that setting shear pin is born is more than the shear strength of setting shear pin, setting shear pin is cut.
Step 904:After the cutting of setting shear pin, at least two packing elements are compressed by setting piston, make at least two glue Cylinder expansion is setting to complete.
After setting shear pin is cut, setting descent of piston, its lower line mode is that spiral is descending, and at least two packing elements are carried out Compression, expanded after packing element compression, contact production tree tube inner wall, production tree tubing hanger is sealed, piston after the completion of sealing Snap works, and setting piston is locked, completes setting.
Step 905:Guiding valve and valve pocket is promoted to continue traveling downwardly by steel ball, to cut the guiding valve between guiding valve and position-limit mechanism Shear pin.
After the completion of setting, external equipment continues to pressurize, and the shear stress that guiding valve shear pin is subject to gradually increases, when guiding valve shear pin When the shear stress born is more than the shear strength of guiding valve shear pin, guiding valve shear pin is cut, and guiding valve, valve pocket and steel ball are descending, When the connected mode of valve pocket and stop collar is is threadedly coupled, its lower line mode is that spiral is descending.
It should be noted that the shear strength of guiding valve shear pin is more than the shear strength of setting shear pin, therefore in external equipment During pressurization, setting shear pin is first cut, and continues guiding valve shear pin cutting of pressurizeing.
Step 906:After the cutting of guiding valve shear pin, the formation passage between blanking plug and production tree oil pipe, followed with establishing Ring well-flushing passage.
As shown in fig. 6, guiding valve, valve pocket and steel ball spiral are descending, the position of valve pocket lower surface and deck upper surface is come downwards to After stop descending, guiding valve snap work, slide-valve gear is locked in current location, now between blanking plug and production tree oil pipe Passage is opened, and circulation well cleanup Path Setup is completed, and during circulation well cleanup, well-flushing working solution injects from well head, by blanking plug Stroke cylinder, telescoping tube, central tube and stop collar, oil pipe is entered by the hole in stop collar side wall, carries out circulation well cleanup.
In embodiments of the present invention, the pressure energy provided external equipment by the blocking cylinder mechanism in blanking plug is converted into Mechanical energy, compression mount sealing mechanism, setting mechanism are carried out in the presence of cylinder mechanism and position-limit mechanism is blocked to production tree tubing hanger Sealing, establishes circulation well cleanup passage by slide-valve gear, solves production tree tubing hanger blow-by, can not carry out circulation well cleanup Problem.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit the invention, it is all the present invention spirit and Within principle, any modification, equivalent substitution and improvements made etc., it should be included in the scope of the protection.

Claims (9)

1. a kind of blanking plug, it is characterised in that the blanking plug includes:Block cylinder mechanism, setting mechanism, slide-valve gear and spacing Mechanism;
The blocking cylinder mechanism is connected with the setting mechanism, and the blocking cylinder mechanism is used in well-flushing, and external equipment is carried The pressure energy of confession is converted into mechanical energy, and the setting mechanism is used to carry out seat by the mechanical energy that the blocking cylinder mechanism provides Envelope, to be sealed to production tree tubing hanger;
The slide-valve gear is connected with the position-limit mechanism, and the position-limit mechanism is connected with the blocking cylinder mechanism, the guiding valve Mechanism is located inside the position-limit mechanism, and the slide-valve gear and the position-limit mechanism are located at the lower end of the setting mechanism, The one end blocked described in the blanking plug residing for cylinder mechanism is upper end, and one end residing for the position-limit mechanism is lower end, institute The position that position-limit mechanism is used to limit the setting mechanism is stated, the slide-valve gear is used to open the blanking plug and production tree oil Passage between pipe establishes circulation well cleanup passage.
2. blanking plug as claimed in claim 1, it is characterised in that the blocking cylinder mechanism includes:Stroke cylinder, push piston, Telescoping tube, cylinder pressure, setting piston, central tube and piston snap;
The piston that pushes is connected with one end of the telescoping tube, and is inserted in the stroke cylinder;
The other end of the telescoping tube is connected with one end of the central tube, and one end of the central tube also connects with the cylinder pressure Connect, and be connected between the setting piston by setting shear pin, the setting piston is also connected with the piston snap, institute The other end for stating central tube is connected with the position-limit mechanism, with by the stroke cylinder, it is described push piston, the telescoping tube, The annular seal space that the cylinder pressure, the setting piston, the central tube, the slide-valve gear and the position-limit mechanism are formed, will The pressure energy that external equipment provides is converted into mechanical energy.
3. blanking plug as claimed in claim 1, it is characterised in that the setting mechanism includes:At least two packing elements, at least one Individual pressure ring and pressure cap;
At least two packing element, at least one pressure ring and the pressure cap are sequentially arranged in the blocking cylinder mechanism, and At least one pressure ring is located between the packing element that any two is adjacent at least two packing element, and the pressure cap is positioned at described The lower end of at least two packing elements, under the cooperation of the pressure ring and the pressure cap, to compress the packing element by the setting piston, And the expansion progress after being compressed by the packing element is setting.
4. blanking plug as claimed in claim 1, it is characterised in that the slide-valve gear includes:Guiding valve, valve pocket, steel ball and cunning Valve snap;
The steel ball is placed in the valve pocket, and the valve pocket is connected with the guiding valve, the guiding valve snap respectively, and the valve pocket is also It is connected by guiding valve shear pin with the position-limit mechanism.
5. blanking plug as claimed in claim 1, it is characterised in that the position-limit mechanism includes:Stop collar and deck;
One end of the stop collar is connected with the other end of the central tube, and with the lower end in contact of the setting mechanism, with limit The position of the fixed setting mechanism;
The other end of the stop collar is connected with the deck, and the stop collar is also connected by guiding valve shear pin and the slide-valve gear Connect.
6. blanking plug as claimed in claim 1, it is characterised in that the blanking plug also includes well head joint;
One end of the well head joint is connected with the lower end of the stroke cylinder, and the well head joint and the stroke cylinder are coaxial, For connecting the blanking plug and the production tree oil pipe.
7. a kind of method sealed by any blanking plugs of claim 1-6 to production tree tubing hanger, its feature exist In methods described includes:
After the blanking plug is placed in production tree oil pipe, the pressure energy for being provided external equipment by blocking cylinder mechanism is changed For mechanical energy;
Restriction of the mechanical energy and position-limit mechanism provided by the blocking cylinder mechanism to setting mechanism position, to the setting machine Structure is compressed, to seal the production tree tubing hanger;
After the setting mechanism is setting, the passage between the blanking plug and production tree oil pipe is opened by slide-valve gear to build Vertical circulation well cleanup passage.
8. method as claimed in claim 7, it is characterised in that the mechanical energy and limit provided by the blocking cylinder mechanism Restriction of the position mechanism to setting mechanism position, is compressed to the setting mechanism, including:
The mechanical energy provided by the blocking cylinder mechanism, promoted by steel ball push piston, telescoping tube, cylinder pressure, setting piston, Piston snap, central tube, at least two packing elements, at least one pressure ring, pressure cap, stop collar, deck, guiding valve, valve pocket and guiding valve lock Spring is descending together;
When come downwards to it is described push the shoulder position of piston when, under the setting piston continues under the driving of the mechanical energy OK, setting shear pin is cut;
After the setting shear pin is cut, at least two packing element is compressed by the setting piston, makes described at least two Individual packing element expansion is setting to complete, and the shoulder position for pushing piston is the position in the well head upper end of joint face.
9. method as claimed in claim 8, it is characterised in that described that the blanking plug and production tree are opened by slide-valve gear Passage between oil pipe establishes circulation well cleanup passage, including:
Guiding valve and valve pocket is promoted to continue traveling downwardly by the steel ball, to cut the guiding valve between the guiding valve and the position-limit mechanism Shear pin;
After guiding valve shear pin cutting, the formation passage between the blanking plug and the production tree oil pipe, followed with establishing Ring well-flushing passage.
CN201610757692.3A 2016-08-29 2016-08-29 Plug device Active CN107780875B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108661593A (en) * 2018-05-07 2018-10-16 中国海洋石油集团有限公司 A kind of blanking plug of cooperation continuous oil pipe operation
CN114075939A (en) * 2022-01-07 2022-02-22 胜利油田北方实业集团有限责任公司 Oil pipe plug convenient to operation

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CN104500015A (en) * 2014-10-21 2015-04-08 中国石油集团川庆钻探工程有限公司 Staged fracturing acidification controllable setting packer for oil-gas well
CN204252931U (en) * 2014-10-29 2015-04-08 中国石油天然气股份有限公司 Water injection packer
CN206016757U (en) * 2016-08-29 2017-03-15 中国石油天然气股份有限公司 Blanking plug

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US20110232899A1 (en) * 2010-03-24 2011-09-29 Porter Jesse C Composite reconfigurable tool
CN201810261U (en) * 2010-06-13 2011-04-27 中国石油化工股份有限公司 Water-injecting packer capable of being backwashed
CN202325386U (en) * 2011-12-01 2012-07-11 阜新驰宇石油机械有限公司 Stepped setting fracture packer
CN104500015A (en) * 2014-10-21 2015-04-08 中国石油集团川庆钻探工程有限公司 Staged fracturing acidification controllable setting packer for oil-gas well
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108661593A (en) * 2018-05-07 2018-10-16 中国海洋石油集团有限公司 A kind of blanking plug of cooperation continuous oil pipe operation
CN114075939A (en) * 2022-01-07 2022-02-22 胜利油田北方实业集团有限责任公司 Oil pipe plug convenient to operation

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