CN111236881A - Large-drift-diameter treatment-free underground high-pressure temporary plugging device and method - Google Patents
Large-drift-diameter treatment-free underground high-pressure temporary plugging device and method Download PDFInfo
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- CN111236881A CN111236881A CN202010191220.2A CN202010191220A CN111236881A CN 111236881 A CN111236881 A CN 111236881A CN 202010191220 A CN202010191220 A CN 202010191220A CN 111236881 A CN111236881 A CN 111236881A
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000007246 mechanism Effects 0.000 claims abstract description 64
- 238000007789 sealing Methods 0.000 claims abstract description 54
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 230000001012 protector Effects 0.000 claims abstract description 14
- 238000013461 design Methods 0.000 claims abstract description 6
- 230000000903 blocking effect Effects 0.000 claims description 18
- 230000001681 protective effect Effects 0.000 claims description 14
- 230000009471 action Effects 0.000 claims description 7
- 239000002195 soluble material Substances 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 4
- 238000010008 shearing Methods 0.000 claims description 4
- 210000000664 rectum Anatomy 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 16
- 239000000463 material Substances 0.000 abstract description 3
- 230000000149 penetrating effect Effects 0.000 abstract 1
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- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
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Abstract
The invention belongs to the technical field of oil and gas field underground technical operation tools, and particularly relates to a large-drift-diameter treatment-free underground high-pressure temporary plugging tool and a method. The invention is formed by organically combining a releasing mechanism, a card sealing mechanism, a temporary plug, a supporting seat and a fixing piece. The invention is simple and reliable through the penetrating releasing structure, and makes the whole tool small and small, and fully utilizes the characteristic that the releasing load can be adjusted by changing the size of the releasing structure. The design of the invention avoids the stress on the central tube by bearing the main load through the bottom support seat, so that the central tube breaks through the limitation of material performance; the central pipe has a larger drift diameter with the pipe diameter being more than or equal to 50mm, and can be consistent with the inner diameter of a production oil pipe, so that later-stage liquid drainage and oil pipe passing operation can be smoothly carried out, and the construction safety is ensured. The cone, the umbrella protector, the retaining ring and the rubber cylinder are all made of self-releasing materials, the failure can be automatically released after construction is finished, and the full drift diameter of the shaft can be realized without special treatment subsequently.
Description
Technical Field
The invention belongs to the technical field of oil and gas field reservoir transformation, and particularly relates to a large-drift-diameter treatment-free underground high-pressure temporary plugging device and method.
Background
In the development of oil and gas fields in the prior art, after the fracturing construction of a coiled tubing of an oil and gas well is completed, a production string is usually required to be matched with pressurized equipment to perform production. The operation technology degree of difficulty is big under pressure, and the construction risk is high, utilizes the equipment under pressure to cooperate the production string down, often causes other high risk wells etc. to stop, is unfavorable for the quick development of oil gas resource. At present, two underground temporary plugging schemes based on the traditional bridge plug form appear, one is a fishable bridge plug with temporary plugging arranged inside, a cable is sealed inside a shaft to temporarily plug underground high pressure, then a production pipe column is normally tripped in by adopting a normal pressure tripping process, and the bridge plug is taken out by tripping a fishing drill at the later stage; the other scheme is a fully soluble bridge plug with a temporary plug arranged inside, and the full drift diameter of the shaft can be realized without processing and dissolving completely in the later period. However, the salvaging type temporary plugging bridge plug has higher requirement on the reliability of the tool during operation, so that the construction risk is higher, the later salvaging difficulty is gradually increased along with the lengthening of the production time, and the subsequent shaft operation is not utilized; the full-soluble temporary plugging bridge plug can keep the full drift diameter of a shaft without special post treatment, but the inner diameter of a central pipe is often smaller due to the limitation of the performance of the existing soluble material and the limitation of the pressure bearing capacity, so that the subsequent construction is not facilitated, and the interference of different working condition factors on a large number of soluble parts is larger, so that the construction safety is influenced.
Therefore, aiming at the requirement of temporarily blocking underground high pressure to realize the production of a well head under normal pressure after the fracturing construction of the continuous oil pipe of the oil-gas well is finished at present, a downhole high-pressure temporary blocking tool which is reliable in structure, simple to operate, large in inner drift diameter and free of treatment in the later stage needs to be developed, so that the construction efficiency and the operation safety of oil-gas field transformation are improved.
Disclosure of Invention
The invention provides a large-drift-diameter treatment-free underground high-pressure temporary plugging device and method, and aims to provide an underground temporary plugging device and method which are reliable in structure, simple to operate, large in inner drift diameter and free of treatment in the later period, so that the oil-gas field transformation construction efficiency and the operation safety are improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a large-drift-diameter treatment-free underground high-pressure temporary plugging tool comprises a releasing mechanism, a blocking mechanism, a temporary plug, a supporting seat and a fixing piece; the lower end of the releasing mechanism is detachably connected with the inner side wall of the temporary plug, and the outer side wall of the upper part of the releasing mechanism is contacted with the upper end face of the card sealing mechanism; the supporting seat is sleeved on the outer side wall of the lower end of the temporary plug and is fixed through a fixing piece; the card sealing mechanism is arranged on the periphery of the releasing mechanism, and the lower end of the card sealing mechanism is connected in a gap between the upper part of the supporting seat and the temporary plug and sealed with the temporary plug through a sealing piece.
The releasing mechanism comprises a releasing rod and a stress rod; the releasing rod and the stress rod are arranged up and down, and the outer side walls of the upper end and the lower end of the stress rod are respectively connected with the releasing rod and the inner side wall of the temporary plug through screw threads.
The hand throwing rod is a hollow cylindrical body consisting of an upper section of cylinder and a lower section of cylinder, the outer diameter of the upper end cylinder is larger than that of the lower section of cylinder, and the length of the upper end cylinder is smaller than that of the lower section of cylinder; the upper end surface of the card sealing mechanism is contacted with the joint of the upper section of the cylinder and the lower section of the cylinder of the hand throwing rod.
The stress rod is a cylindrical body with a ring-shaped groove in the middle for breaking.
The sealing and clamping mechanism comprises a movable sleeve, a slip, a cone, a second seat-prevention shear pin, an umbrella protector, a retaining ring, a rubber cylinder and a central pipe; the movable sleeve, the slips, the cone, the umbrella protector, the protective ring and the rubber cylinder are all sleeved outside the central pipe; the rubber cylinder is sleeved in the middle of the central pipe, and the retaining ring, the umbrella protector, the cone and the slips are sequentially and symmetrically arranged towards two sides by taking the rubber cylinder as a center; the cone is fixed with the central pipe through a second anti-seat shear pin; the movable sleeve is in contact with the slips at the upper part and is fixed with the central pipe through the first anti-seating shear pin; the upper end of the central tube is in contact with the releasing mechanism, and the lower end of the central tube is connected in a gap between the supporting seat and the temporary plug and is sealed with the temporary plug through a sealing ring.
The cone, the umbrella protector, the protective ring and the rubber cylinder are made of soluble materials.
The pipe diameter of the central pipe is larger than or equal to 50mm and is consistent with the inner diameter of the oil pipe for production.
The temporary plug is an integral structure formed by an upper section of columnar body and a lower section of columnar body with different outer diameters; the upper section of cylindrical body is a hollow cylindrical body, the outer diameter of the upper section of cylindrical body is smaller than that of the lower section of cylindrical body, and an inclined contact circular bead surface is arranged at the joint of the upper section of cylindrical body and the lower section of cylindrical body; the supporting seat is a hollow cylindrical body, and a boss matched with the contact circular bead surface is arranged in the middle of the inner side wall of the supporting seat.
The fixing piece adopts a starting shear pin.
A temporary plugging method of a large-drift-diameter treatment-free underground high-pressure temporary plugging tool comprises the following steps
The method comprises the following steps: the upper end of a releasing rod of the large-drift-diameter treatment-free underground high-pressure temporary plugging tool is connected with a setting tool joint through a screw thread, a push cylinder arranged on the setting tool is installed in place and then is contacted with the upper end face of a movable sleeve, and the upper end of the setting tool is connected with a cable to a wellhead;
step two: the movable sleeve moves downwards under the action of thrust of the setting tool, slips symmetrically arranged by taking the rubber sleeve as a center are pushed and expanded, the slips and the cone relatively slide and clamp the inner side wall of the sleeve, meanwhile, the umbrella is expanded under the pushing of the cone to fill an annular gap between the tool and the sleeve, the compressed rubber sleeve is further compacted together with the retaining ring, the rubber sleeve is tightly contacted with the inner side wall of the sleeve and the central pipe to form extrudable seal, after a preset load is reached, the handle bar is thrown to break the annular groove in the middle of the stress rod, the tool is completely released, and the inner channel of the central pipe is sealed by matching of a temporary plug and a sealing ring;
step three: after the shaft operation is finished, installing a wellhead facility in the oil-gas well, connecting a pump truck to pump pressure into the shaft, after the design pressure is reached, temporarily blocking the oil-gas well, shearing off a starting shear pin under the action of downward piston force, and enabling the temporarily blocking to fall into the bottom of the shaft, so that the oil-gas well normally drains liquid and is put into production;
step four: after normal liquid discharge and delivery of the oil-gas well, the cone, the umbrella, the retaining ring and the rubber cylinder are gradually dissolved and lose efficacy, and finally the residual part of the tool automatically falls into the well bottom.
Has the advantages that:
(1) the invention is formed by organically combining a releasing mechanism, a card sealing mechanism, a temporary plug, a supporting seat and a fixing piece. The lower end of the releasing mechanism is connected with the inner side wall of the temporary plug, the supporting seat is sleeved on the outer side wall of the lower end of the temporary plug and is fixed through a fixing piece, and a gap is formed between the upper part of the supporting seat and the temporary plug; the card sealing mechanism is sleeved on the periphery of the releasing mechanism, the upper end of the card sealing mechanism is in contact with the releasing mechanism, and the lower end of the card sealing mechanism is connected in a gap between the upper part of the supporting seat and the temporary plug and sealed with the temporary plug. The invention uses simple tool structure to realize high-pressure reliable temporary plugging of the shaft.
(2) The releasing structure adopts the technical scheme of the stress rod, so that the releasing load is adjustable.
(3) The central pipe has larger drift diameter, so that later-stage liquid drainage and oil pipe passing operation are smoothly carried out, and the construction safety is ensured.
(4) The cone, the umbrella protector, the retaining ring and the rubber cylinder are made of soluble materials, the tool is automatically dissolved and loses efficacy after construction is finished, and the full drift diameter of the shaft can be realized without special treatment subsequently.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the initial state of the present invention in operation;
FIG. 3 is a schematic view of the plugging status of the present invention in operation;
FIG. 4 is a schematic view of the pump on state of the present invention in operation;
FIG. 5 is a schematic view of the self-release state of the present invention in operation;
FIG. 6 is a schematic cross-sectional view of a stress beam of the present invention.
In the figure: 1-throwing a handle; 2-a movable sleeve; 3-first anti-seating shear pins; 4-slips; 5-a cone; 6-second anti-seating shear pins; 7-umbrella protection; 8-protecting the ring; 9-a rubber cylinder; 10-a central tube; 11-stress bar; 12-a sealing ring; 13-temporary plugging; 14-a support base; 15-starting the shear pin; 16-a cannula; 17-setting tool push cylinder; 18-setting the tool joint; 19-annular groove.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the large-drift-diameter treatment-free downhole high-pressure temporary plugging tool comprises a releasing mechanism, a blocking mechanism, a temporary plug 13, a supporting seat 14 and a fixing piece, wherein the releasing mechanism is arranged on the releasing mechanism; the lower end of the releasing mechanism is detachably connected with the inner side wall of the temporary plug 13, and the outer side wall of the upper part of the releasing mechanism is contacted with the upper end face of the card sealing mechanism; the supporting seat 14 is sleeved on the outer side wall of the lower end of the temporary plug 13 and is fixed through a fixing piece; the card sealing mechanism is arranged on the periphery of the releasing mechanism, and the lower end of the card sealing mechanism is connected in a gap between the upper part of the supporting seat 14 and the temporary plug 13 and sealed with the temporary plug 13 through a sealing piece.
Preferably the fastener is a trigger pin 15.
When the underground high-pressure temporary plugging tool is actually used, the upper end of the large-drift-diameter treatment-free underground high-pressure temporary plugging tool is connected with a base sealing tool joint screw thread in the prior art, a push cylinder arranged on the base sealing tool is installed in place and then is contacted with a sealing and clamping mechanism, and the upper end of the base sealing tool is connected with a cable to a wellhead; the blocking mechanism moves downwards under the thrust action of a blocking tool to complete contact and clamping with the inner side wall of the sleeve 16, and the sealing is extruded, and a part of the upper part of the releasing mechanism is released after a preset load is reached. The temporary plug 13 is matched with the blocking mechanism to realize sealing, and at the moment, the whole tool is in a shaft blocking working state. After the shaft operation is finished, the oil-gas well is provided with a wellhead facility, a pump truck is connected to pump pressure into the shaft, after the design pressure is reached, the temporary plug 13 is forced by a downward piston to cut off a fixing piece, namely, a shear pin 15 is started, and the temporary plug 13 falls into the bottom of the well, so that the oil-gas well normally drains liquid and is put into production.
The temporary plug 13 is installed together with the supporting seat 14 through the starting shear pin 15, is limited upwards, and can be opened by shearing the starting shear pin 15 downwards. The fixing piece adopts a starting shear pin 15, so that the replacement is quick and convenient, and the pump-on load of the temporary plug 13 can be controlled by adjusting the quantity and the size.
The invention realizes reliable temporary plugging of the shaft under high pressure by a simple structural tool. The drift diameter of the central pipe is not less than 50mm, so that later-stage liquid drainage and oil pipe passing operation are carried out smoothly, and the construction safety is ensured.
Example two:
the large-drift-diameter treatment-free downhole high-pressure temporary plugging tool shown in fig. 1-3 and 6 is different from the first embodiment in that: the releasing mechanism comprises a releasing rod 1 and a stress rod 11; releasing rod 1 and stress rod 11 set up from top to bottom, stress rod 11 upper and lower both ends lateral wall respectively with releasing rod 1 and temporary jam 13 inside wall screw thread connection.
Furthermore, the stress rod 11 is a cylindrical body with an annular groove 19 for breaking at the middle part.
In practical use, when the blocking mechanism moves downwards under the thrust action of the blocking tool to complete contact and clamping with the inner side wall of the sleeve 16 and squeeze and seal, and after a preset load is reached, the throwing rod 1 breaks a weak point arranged in the middle of the stress rod 11, namely the annular groove 19, and the tool is completely released.
In a specific application, the stress rod 11 adopts the prior art, and the stress rod 11 can be used for adjusting the releasing load through the set size of the stress rod 11.
By adopting the technical scheme, the tool is convenient to connect, and the strength meets the requirement. By adopting the technical scheme that the releasing structure is provided with the stress rod, the releasing load is adjustable.
By adopting the technical scheme of the invention, the characteristic that the change of the dimension of the releasing structure enables the releasing load to be adjustable is fully utilized, the overall dimension of the tool is shortened, and the characteristic that the change of the dimension of the releasing structure enables the releasing load to be adjustable is fully utilized. .
Example three:
the large-drift-diameter treatment-free downhole high-pressure temporary plugging tool shown in fig. 1-5 is different from the first embodiment in that: the blocking mechanism comprises a movable sleeve 2, a slip 4, a cone 5, a second anti-seat shear pin 6, an umbrella protector 7, a protective ring 8, a rubber cylinder 9 and a central pipe 10; the movable sleeve 2, the slips 4, the cone 5, the umbrella protector 7, the protective ring 8 and the rubber cylinder 9 are all sleeved outside the central tube 10; the rubber cylinder 9 is sleeved in the middle of the central tube 10, and the retaining ring 8, the umbrella 7, the cone 5 and the slips 4 are sequentially and symmetrically arranged towards two sides by taking the rubber cylinder 9 as the center; the cone 5 is fixed with a central tube 10 through a second anti-seating shear pin 6; the movable sleeve 2 is in contact with a slip 4 positioned at the upper part and is fixed with the central pipe 10 through a first anti-seating shear pin 3; the upper end of the central tube 10 is contacted with the releasing mechanism, and the lower end of the central tube 10 is connected in a gap between the upper part of the supporting seat 14 and the temporary plug 13 and sealed with the temporary plug 13.
In practical use, when the large-drift diameter treatment-free underground high-pressure temporary plugging tool is lowered to a designed depth, the movable sleeve 2 moves downwards under the thrust action of the seat sealing tool, slips 4 symmetrically arranged by taking the rubber sleeve 9 as a center are pushed and expanded, the slips 4 and the cone 5 slide relatively and clamp the inner side wall of the sleeve 16, the umbrella protector 7 is pushed by the cone 5 to expand an annular gap between the filling tool and the sleeve, the compressed rubber sleeve 9 is further compacted together with the protective ring 8, finally the rubber sleeve 9 is in close contact with the inner side wall of the sleeve 16 and the central tube 10 to form reliable extrusion sealing, after a preset load is reached, the releasing mechanism is pulled off at a weak point, the tool is completely released, a channel inside the central tube 10 is tightly matched with the central tube 10 through the temporary plug 13 to realize sealing, and at the moment, the whole tool is in a shaft plugging working state.
According to the technical scheme, the drift diameter of the central pipe 10 is large, so that later-stage liquid drainage and oil pipe passing operation can be smoothly carried out, and the construction safety is guaranteed.
Example four:
according to the large drift diameter treatment-free downhole high-pressure temporary plugging tool shown in fig. 1 and 5, the difference from the first embodiment is that: a sealing ring 12 is arranged between the central tube 10 and the releasing mechanism.
In practical use, the arrangement of the sealing ring 12 enables the temporary plug 13 to have a better sealing effect with the central tube 10, and the cost is lower.
Example five:
according to the large drift diameter treatment-free downhole high-pressure temporary plugging tool shown in fig. 1, 3 and 4, the difference from the first embodiment is that: the cone 5, the umbrella 7, the protective ring 8 and the rubber cylinder 9 are made of soluble materials.
Preferably, the pipe diameter of the central pipe 10 is more than or equal to 50mm and is consistent with the inner diameter of the oil pipe for production.
In practical use, the cone 5, the umbrella 7, the retaining ring 8 and the rubber sleeve 9 are made of soluble metal, the soluble parts of the cone 5, the umbrella 7, the retaining ring 8 and the rubber sleeve 9 are gradually dissolved and lose efficacy in a period of normal liquid drainage and production of an oil-gas well, finally, the residual part of the tool automatically falls into the bottom of the well, and the full drift diameter of the shaft can be realized without special treatment in the subsequent design.
The central tube 10 has a larger drift diameter with the tube diameter being more than or equal to 50mm, and can be consistent with the inner diameter of a production oil tube, so that later-stage liquid drainage and oil tube passing operation can be smoothly carried out, and the construction safety is ensured.
The soluble material in this embodiment is the prior art.
Example six:
according to the large drift diameter treatment-free downhole high-pressure temporary plugging tool shown in fig. 1, 4 and 5, the difference from the first embodiment is that: the temporary plug 13 is an integral structure formed by an upper section of columnar body and a lower section of columnar body with different outer diameters; the upper section of cylindrical body is a hollow cylindrical body, the outer diameter of the upper section of cylindrical body is smaller than that of the lower section of cylindrical body, and an inclined contact circular bead surface is arranged at the joint of the upper section of cylindrical body and the lower section of cylindrical body; the supporting seat 14 is a hollow cylindrical body, and a boss matched with the contact shoulder surface is arranged in the middle of the inner side wall of the supporting seat 14.
During the in-service use, supporting seat 14 and temporary jam 13 adopt this technical scheme for the releasing load that releasing mechanism transmitted for temporary jam 13 all acts on supporting seat 14, has avoided the center tube 10 atress of card sealing mechanism, thereby has broken through the restriction of material performance.
Example seven:
a temporary plugging method of a large-drift-diameter treatment-free underground high-pressure temporary plugging tool comprises the following steps
The method comprises the following steps: the upper end of a lost handle rod 1 of the large-drift-diameter treatment-free underground high-pressure temporary plugging tool is connected with a base sealing tool joint through a screw thread, a push cylinder arranged on the base sealing tool is installed in place and then is contacted with the upper end face of a movable sleeve 2, and the upper end of the base sealing tool is connected with a cable to a wellhead;
step two: the movable sleeve 2 moves downwards under the thrust action of a seat sealing tool, slips 4 symmetrically arranged by taking a rubber sleeve 9 as a center are pushed and opened, the slips 4 and a cone 5 slide relatively and are opened to clamp the inner side wall of a sleeve 16, meanwhile, an umbrella protector 7 is pushed by the cone 5 to open and fill an annular gap between the tool and the sleeve 16, the compressed rubber sleeve 9 is further compacted together with a retaining ring 8, the rubber sleeve 9 is tightly contacted with the inner side wall of the sleeve 16 and a central tube 10 to form extrudable seal, after a preset load is reached, a hand rod 1 is thrown to break an annular groove 19 in the middle of a stress rod 11, the tool is completely released, and a channel in the central tube 10 is sealed by matching of a temporary plug 13 and a sealing ring 12;
step three: after the shaft operation is finished, installing a wellhead facility in the oil-gas well, connecting a pump truck to pump pressure into the shaft, shearing a starting shear pin 15 by the downward piston force of a temporary plug 13 after the design pressure is reached, and enabling the temporary plug 13 to fall into the bottom of the well, so that the oil-gas well normally drains liquid and puts into production;
step four: after normal liquid discharge and delivery of the oil-gas well, the cone 5, the protective umbrella 7, the protective ring 8 and the rubber cylinder 9 are gradually dissolved and lose efficacy, and finally the residual part of the tool automatically falls into the well bottom.
The invention solves the technical problem of realizing normal-pressure drilling of a wellhead by temporarily blocking underground high pressure of a small-bore wellbore, realizes normal running of a production pipe column at the wellhead after temporarily blocking the high pressure in the wellbore through the large-drift-diameter treatment-free underground high-pressure temporary blocking tool with reliable structure and simple operation, presses and beats the temporary blockage 13 in the temporary blocking device in the wellbore, can communicate a liquid and gas drainage channel, finally the tool is dissolved in the wellbore environment by itself, can realize the full drift diameter of the wellbore without subsequent treatment, and improves the operation safety and the construction efficiency of liquid and gas drainage and gas production operation of the oil and gas well.
In conclusion, the invention is formed by organically combining the releasing mechanism, the card sealing mechanism, the temporary plug, the supporting seat and the fixing piece. The lower end of the releasing mechanism is connected with the inner side wall of the temporary plug, the supporting seat is sleeved on the outer side wall of the lower end of the temporary plug and is fixed through a fixing piece, and a gap is formed between the upper part of the supporting seat and the temporary plug; the card sealing mechanism is sleeved on the periphery of the releasing mechanism, the upper end of the card sealing mechanism is in contact with the releasing mechanism, and the lower end of the card sealing mechanism is connected in a gap between the upper part of the supporting seat and the temporary plug and sealed with the temporary plug. The invention uses simple tool structure to realize high-pressure reliable temporary plugging of the shaft.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. The utility model provides a temporary stifled instrument of big latus rectum exempts from to handle high pressure in pit which characterized in that: comprises a releasing mechanism, a card sealing mechanism, a temporary plug (13), a supporting seat (14) and a fixing piece; the lower end of the releasing mechanism is detachably connected with the inner side wall of the temporary plug (13), and the outer side wall of the upper part of the releasing mechanism is contacted with the upper end face of the card sealing mechanism; the supporting seat (14) is sleeved on the outer side wall of the lower end of the temporary plug (13) and is fixed through a fixing piece; the card sealing mechanism is arranged on the periphery of the releasing mechanism, and the lower end of the card sealing mechanism is connected in a gap between the upper part of the supporting seat (14) and the temporary plug (13) and sealed with the temporary plug (13) through a sealing piece.
2. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 1, wherein: the releasing mechanism comprises a releasing rod (1) and a stress rod (11); the hand throwing rod (1) and the stress rod (11) are arranged up and down, and the outer side walls of the upper end and the lower end of the stress rod (11) are respectively in threaded connection with the inner side walls of the hand throwing rod (1) and the temporary plug (13).
3. A large drift diameter treatment-free downhole high pressure temporary plugging tool according to claim 2, wherein: the hand throwing rod (1) is a hollow cylindrical body consisting of an upper section of cylinder and a lower section of cylinder, the outer diameter of the upper end cylinder is larger than that of the lower section of cylinder, and the length of the upper end cylinder is smaller than that of the lower section of cylinder; the upper end surface of the card sealing mechanism is contacted with the joint of the upper section of cylinder and the lower section of cylinder of the hand throwing rod (1).
4. A large drift diameter treatment-free downhole high pressure temporary plugging tool according to claim 2, wherein: the stress rod (11) is a cylindrical body with a ring-shaped groove (19) for breaking at the middle part.
5. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 1, wherein: the blocking mechanism comprises a movable sleeve (2), a slip (4), a cone (5), a second anti-seat shear pin (6), a protective umbrella (7), a protective ring (8), a rubber cylinder (9) and a central tube (10); the movable sleeve (2), the slips (4), the cone (5), the umbrella protector (7), the protective ring (8) and the rubber cylinder (9) are all sleeved outside the central tube (10); the rubber cylinder (9) is sleeved in the middle of the central tube (10), and the retaining ring (8), the umbrella protector (7), the cone (5) and the slips (4) are sequentially and symmetrically arranged towards two sides by taking the rubber cylinder (9) as a center; the cone (5) is fixed with the central tube (10) through a second anti-seating shear pin (6); the movable sleeve (2) is in contact with a slip (4) positioned at the upper part and is fixed with the central pipe (10) through a first anti-seat shear pin (3); the upper end of the central tube (10) is in contact with the releasing mechanism, and the lower end of the central tube (10) is connected in a gap between the supporting seat (14) and the temporary plug (13) and sealed with the temporary plug (13) through a sealing ring (12).
6. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 5, wherein: the cone (5), the umbrella protector (7), the protective ring (8) and the rubber cylinder (9) are made of soluble materials.
7. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 5, wherein: the pipe diameter of the central pipe (10) is larger than or equal to 50mm and is consistent with the inner diameter of the oil pipe for production.
8. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 1, wherein: the temporary plug (13) is an integrated structure consisting of an upper section of columnar body and a lower section of columnar body with different outer diameters; the upper section of cylindrical body is a hollow cylindrical body, the outer diameter of the upper section of cylindrical body is smaller than that of the lower section of cylindrical body, and an inclined contact circular bead surface is arranged at the joint of the upper section of cylindrical body and the lower section of cylindrical body; the supporting seat (14) is a hollow cylindrical body, and a boss matched with the contact shoulder surface is arranged in the middle of the inner side wall of the supporting seat (14).
9. The large-drift-diameter treatment-free downhole high-pressure temporary plugging tool according to claim 1, wherein: the fixing piece adopts a starting shear pin (15).
10. The temporary plugging method of the large-drift-diameter treatment-free underground high-pressure temporary plugging tool is characterized by comprising the following steps
The method comprises the following steps: the upper end of a hand throwing rod (1) of the large-drift-diameter treatment-free underground high-pressure temporary plugging tool is connected with a base sealing tool joint screw thread, a push cylinder arranged on the base sealing tool is installed in place and then is contacted with the upper end face of a movable sleeve (2), and the upper end of the base sealing tool is connected with a cable to a wellhead;
step two: the movable sleeve (2) moves downwards under the thrust action of a seat sealing tool, slips (4) symmetrically arranged by taking a rubber sleeve (9) as a center are pushed and spread, the slips (4) and a cone (5) relatively slide and spread to clamp the inner side wall of a sleeve (16), meanwhile, an umbrella protector (7) is pushed by the cone (5) to spread and fill an annular gap between the tool and the sleeve (16), the compressed rubber sleeve (9) is further compacted together with a retaining ring (8), the rubber sleeve (9) is tightly contacted with the inner side wall of the sleeve (16) and a central tube (10) to form extrudable sealing, after a preset load is reached, a hand throwing rod (1) breaks an annular groove (19) in the middle of a stress rod (11), the tool is completely released, and the internal channel of the central tube (10) is matched with a temporary plug (13) and a sealing ring (12) to realize sealing;
step three: after the shaft operation is finished, installing a wellhead facility in the oil-gas well, connecting a pump truck to pump pressure into the shaft, shearing a starting shear pin (15) by the downward piston force of a temporary plug (13) after the design pressure is reached, and normally draining the liquid and putting the oil-gas well into production when the temporary plug (13) falls into the bottom of the well;
step four: after normal liquid drainage and delivery of the oil-gas well, the cone (5), the protective umbrella (7), the protective ring (8) and the rubber sleeve (9) are gradually dissolved and lose efficacy, and finally the residual part of the tool automatically falls into the well bottom.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010191220.2A CN111236881A (en) | 2020-03-18 | 2020-03-18 | Large-drift-diameter treatment-free underground high-pressure temporary plugging device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010191220.2A CN111236881A (en) | 2020-03-18 | 2020-03-18 | Large-drift-diameter treatment-free underground high-pressure temporary plugging device and method |
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| CN111236881A true CN111236881A (en) | 2020-06-05 |
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| CN212428706U (en) * | 2020-03-18 | 2021-01-29 | 中国石油天然气集团有限公司 | Large-drift-diameter treatment-free underground high-pressure temporary plugging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN204899847U (en) * | 2015-07-20 | 2015-12-23 | 中国石油集团渤海钻探工程有限公司 | Rapid degradation bridging plug |
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