CN115434674B - Multifunctional throttling blanking plug at tail end of speed pipe and use method - Google Patents
Multifunctional throttling blanking plug at tail end of speed pipe and use method Download PDFInfo
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- CN115434674B CN115434674B CN202211203018.2A CN202211203018A CN115434674B CN 115434674 B CN115434674 B CN 115434674B CN 202211203018 A CN202211203018 A CN 202211203018A CN 115434674 B CN115434674 B CN 115434674B
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 51
- 210000002445 nipple Anatomy 0.000 claims abstract description 27
- 230000006835 compression Effects 0.000 claims abstract description 23
- 238000007906 compression Methods 0.000 claims abstract description 23
- 238000005096 rolling process Methods 0.000 claims abstract description 22
- 238000010008 shearing Methods 0.000 claims abstract description 9
- 239000007788 liquid Substances 0.000 claims description 33
- 230000008569 process Effects 0.000 claims description 23
- 210000000078 claw Anatomy 0.000 claims description 22
- 238000013461 design Methods 0.000 claims description 20
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 5
- 238000007689 inspection Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 230000005389 magnetism Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 description 24
- 238000007789 sealing Methods 0.000 description 15
- 230000000903 blocking effect Effects 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
-
- 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
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
-
- 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
- E21B33/128—Packers; Plugs with a member expanded radially by axial pressure
-
- 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
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/08—Valve arrangements for boreholes or wells in wells responsive to flow or pressure of the fluid obtained
-
- 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
- E21B34/142—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools unsupported or free-falling elements, e.g. balls, plugs, darts or pistons
-
- 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
- E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
- E21B2200/06—Sleeve valves
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Pipe Accessories (AREA)
Abstract
The invention relates to a multifunctional throttling plug at the tail end of a speed pipe and a use method thereof, wherein the throttling plug comprises a drop-in type seating plug rod, a rolling joint, a seating nipple, an outer shell, a sliding sleeve, a throttling nozzle, a throttling outer cylinder, a plugging sleeve, a sieve tube and a lower joint; the drop-in type seating plug rod is placed in the rolling joint, the rolling joint is connected with the seating nipple, the seating nipple is connected with the outer shell through threads, the outer shell is connected with the throttling outer cylinder through threads, and a plurality of single-flap valves are installed in the outer shell along the circumference; the sliding sleeve is arranged in a cavity formed by a plurality of single-flap valves, the sliding sleeve is provided with a spring pad, the lower end of the sliding sleeve is sequentially provided with a sliding sleeve shearing ring and a throttling mouth shearing ring, and the bottom of the sliding sleeve is connected with the throttling mouth through a first shear pin; a throttle rod, a piston rod, a compression spring and a threaded ring are sequentially arranged in the throttle outer cylinder from top to bottom; the lower end of the throttling outer cylinder is sequentially connected with a plugging sleeve, a sieve tube and a lower joint, and a plug is arranged in the plugging sleeve. The invention solves the problems of blockage at the tail end of the speed pipe and throttle production.
Description
Technical Field
The invention relates to the technical field of drainage and gas production of a speed pipe, in particular to a multifunctional throttling blanking plug at the tail end of the speed pipe and a use method thereof.
Background
The speed string completion process has been implemented for large-scale applications. At present, the main body of the vertical well/directional well and the horizontal well of the domestic gas field adopts 4 1 / 2 ″、5 1 / 2 The casing well cementation is carried out, and when partial wells are put into production, an snubbing operation machine is adopted to press down an phi 60.3*4.83mm EU N80 oil pipe to serve as a well completion production pipe column. The advantages are as follows: the method is beneficial to protecting and maintaining the original productivity of the stratum; the well killing is not needed, the cost of well killing is saved, and the environment is protected. There are still disadvantages: the number of the snubbing serving machines is limited, and the phi 60.3*4.83mm EU N80 oil pipe is difficult to meet the requirement of large-scale development of the gas field; when the oil pipe with phi 60.3 mm is used for well completion without killing, the drilling speed is low, and the operation efficiency is low; phi 60.3 x 4.83mm tubing versus phi 48.26 x 3.68mm tubing and 2 ", 1 1 / 2 The 'speed pipe column' has larger pipe diameter and limited liquid carrying capacity, and can only meet the production requirement in the initial stage of production, and other auxiliary measures are needed in the later stage of production. Therefore, at home and abroad, 2', 1 are mostly adopted 1 / 2 And the equal continuous oil pipe is used as a speed pipe column for drainage and gas production operation. Through years of research, a technology of hanging a well completion in a well by adopting a continuous pipe is formed in China, the problems of pressurized operation and quick tripping are solved, and the speed string well completion technology is applied in a large scale.
In the process, for a continuous pipe throttling and blocking system, domestic scholars propose an application number 202011223623.7 of a preset downhole throttle; research such as application number 202210256998.6 of three-stage adjustable throttling pressure measurement preset downhole throttler shows that most students currently study throttling in an oil pipe of a conventional tool; for continuous pipe throttling, the device can be compared with patent number CN 215632914U of downhole throttler for continuous oil pipe, and the like, and is only remained on the throttling research at present, and no related throttling and blocking integrated tool is remained in China, and particularly, the continuous pipe tail end throttling and blocking integrated tool is left in China. Because some key tools in the process have some defects, the current speed tube completion process technology has the following three main defects:
1. the existing tool functions can not simultaneously meet the plugging and throttling functions, so that different working conditions or process requirements are caused, and the tubular column in the well is required to be replaced, so that a plurality of inconveniences are brought to cost control, production preparation, safe operation and the like.
2. When partial high-pressure gas wells are put into production for low-pressure gas collection, the throttling and depressurization production cannot be realized in the existing speed pipe column, the application range of the process is severely limited, the in-well throttler needs to be replaced, and the cost control and the full life cycle of the gas well are also influenced.
3. After the production of the speed pipe column in the well for a long time, when the pipe column needs to be replaced, the plugging of the wellhead end can only be realized, the reliable plugging of the whole pipe string can not be realized, and the large well control risk and the potential safety hazard exist during the pipe lifting operation.
According to the reasons, the novel multifunctional throttling pipe end blanking plug is urgent to develop, overcomes the defects of underground tools, and has great significance in realizing the functional requirements of plugging a speed pipe column into a well, throttling production along with bottom hole pressure, bottom hole blocking when a pipe is lifted up under pressure and the like.
Disclosure of Invention
The invention aims to provide a multifunctional throttling blanking plug for the tail end of a speed pipe and a use method thereof, which aim to solve the problems of blocking the tail end of the speed pipe and throttling production. The packer disclosed by the invention can realize four functions of plugging in a pipe when the packer is integrated to lift and lower a speed pipe, automatic throttling and depressurization production in a high-pressure period of a gas well, full-drift-diameter production of a speed pipe column in a low-pressure period, and plugging at a bottom of the well when the speed pipe is lifted under pressure in a well repairing operation.
The technical scheme of the invention is as follows:
the invention relates to a multifunctional throttling blanking plug at the tail end of a speed pipe, which comprises a drop-in type seating plug rod, a rolling joint, a seating nipple, an outer shell, a sliding sleeve, a throttling nozzle, a throttling outer cylinder, a blanking sleeve, a sieve tube and a lower joint; the drop-in type seating plug rod is placed in the rolling joint, the lower end of the rolling joint is connected with the upper end of the seating nipple through threads, the lower end of the seating nipple is connected with the upper end of the outer shell through threads, the lower end of the outer shell is connected with the upper end of the throttling outer cylinder through threads, and a plurality of single flap valves are circumferentially arranged in the upper end of the outer shell; the sliding sleeve is arranged in a cavity formed by a plurality of single-flap valves, the upper end of the sliding sleeve is provided with a spring pad, the lower end of the sliding sleeve is sequentially provided with a sliding sleeve shearing ring and a throttling mouth shearing ring, and the bottom of the sliding sleeve is connected with the throttling mouth through a first shear pin; a throttle rod, a piston rod, a compression spring and a thread ring are sequentially arranged in the throttle outer cylinder from top to bottom; the lower end of the throttling outer cylinder is connected with the plug sleeve and the screen pipe through threads in sequence, and a plug is arranged in the plug sleeve.
Further, the throttle lever comprises a connecting rod and a throttle sleeve, one end of the connecting rod is connected with the throttle nozzle, the other end of the connecting rod is connected with the throttle sleeve, the throttle sleeve is connected with a thread ring, and the thread ring is arranged at the lower end of the throttle outer cylinder; the compression spring is arranged in the throttling sleeve, the upper end of the piston rod can slide up and down in the connecting rod, and the lower end of the piston rod is arranged on the compression spring; the throttle sleeve is provided with a through hole in sequence along the shaft, the center of the upper end of the piston rod is provided with an airflow channel along the axial direction, the side wall of the piston rod is provided with an airflow hole, and the airflow channel can be communicated with the throttle sleeve through the airflow hole.
Further, the plug is fixedly connected with the plug sleeve through a second shear pin, and magnetism is arranged at the bottom of the plug.
Further, the drop-in type seating stopper includes: the upper end body, the claw joint, the jack catch and draw the awl, upper end body lower extreme link to each other with drawing the awl, the claw joint cover is established on drawing the awl, the claw joint lower extreme is connected with the jack catch, and the jack catch can slide on drawing the awl.
Further, the upper end body set up at least one annular seal groove, be provided with first O type rubber ring in the annular seal groove.
Further, the cone is an integrated structure composed of a cone structure at the bottom end, a conical structure at the middle part and a cylinder at the upper end, wherein the small end of the conical structure is connected with the cylinder, and the large end of the conical structure is connected with the cone structure.
Further, a fourth O-shaped rubber ring is arranged at the joint of the lower end of the sitting nipple and the outer shell; the fifth O-shaped rubber ring is arranged at the joint of the lower end of the outer shell and the upper end of the throttling outer cylinder.
The invention also provides a use method of the multifunctional throttling blanking plug at the tail end of the speed pipe, which comprises the following steps:
step one: the multifunctional throttling plug at the tail end of the speed pipe is installed before entering the well;
step two: logging in a well of the multifunctional throttling plug at the tail end of the speed pipe;
step three: opening a multifunctional throttling blanking plug at the tail end of the speed pipe;
after the multifunctional throttling plug at the tail end of the speed pipe is lowered to the design position, injecting liquid from the speed pipe, when the pressure is raised to the design pressure of the plug at the lower end of the multifunctional throttling plug at the tail end of the speed pipe, suddenly reducing the pressure, indicating that the plug is opened, entering a production stage, and if the pressure exceeds 1.5-2 times of the design pressure of the plug, when no pressure drop occurs, lifting the multifunctional throttling plug at the tail end of the speed pipe, and re-entering the well after inspection;
step four: production is carried out by means of the pressure in the well;
in the production process, the pressure outside the speed pipe is kept to be more than 6MPa higher than the pressure inside the speed pipe, and if the pressure outside the speed pipe is less than the pressure inside the speed pipe, the next work is needed;
step five: removing the throttle 17 for secondary production;
step six: when the speed pipe is required to be lifted out, the speed pipe is plugged once;
step seven: when the primary plugging fails, secondary plugging in the pipe is carried out;
step eight: and (3) lifting out the speed pipe and a multifunctional throttling blanking plug at the tail end of the speed pipe.
Further, the specific process of the step six is as follows: the second steel ball is put into the speed pipe, then liquid is injected into the oil pipe, when the pressure rises to the design pressure of the multifunctional throttling plug at the tail end of the speed pipe, the pressure suddenly drops, the sliding sleeve falls into the bottom of the multifunctional throttling plug at the tail end of the speed pipe, the well is opened and the pressure is released, if the pressure in the speed pipe drops to 0, the well is closed again for observation, and if the pressure is still 0, the single-flap valve plays a role, and a speed pipe column can be started; if the pressure in the speed pipe is not 0, the single-flap valve is not operated, and secondary plugging can be performed;
further, the drop-in type seating stopper includes: the upper end body is connected with the guide cone, the jaw joint is sleeved on the guide cone, the lower end of the jaw joint is connected with the jaw, and the jaw can slide on the guide cone; the specific process of the step seven is as follows: when primary plugging fails, when the speed pipe is required to be lifted up with pressure, the input type seating plug rod is input from a wellhead, and gravity is utilized for a vertical well to enable the input type seating plug rod to enter a seating nipple in the speed pipe, so that the plugging of the speed pipe in the well is realized; and (3) pumping the speed pipe which is lowered to a high inclination or a horizontal well section by the speed pipe, pushing the input type sitting stopper rod into the sitting nipple, closing the well, and pushing the upper end body, the first O-shaped rubber ring and the guiding cone to ascend by means of bottom hole pressure, wherein the claw joint is connected with the claw to expand at the outer diameter of the large end of the cone of the guiding cone, so that the plugging in the oil pipe is realized. The specific process of the step seven is as follows: when primary plugging fails, when the speed pipe is required to be lifted up with pressure, the input type seating plug rod 1 is input from a wellhead, and gravity is utilized for a vertical well to enable the input type seating plug rod to enter a seating nipple in the speed pipe, so that the plugging of the speed pipe in the well is realized; for a speed pipe which is lowered to a high inclination or a horizontal well section of the speed pipe, pumping is needed, a drop-in type sitting stopper rod is pushed into a sitting nipple, well closing is performed, the upper end body, an O-shaped rubber ring and a guiding cone are pushed to ascend by means of bottom hole pressure, and a claw joint is connected with a claw to expand at the outer diameter of the large end of the cone of the guiding cone, so that plugging in an oil pipe is realized.
Compared with the prior art, the invention has the advantages that:
1. the invention realizes the functional requirements of plugging the multifunctional restrictor, throttling, plugging the bottom of the pipe when the speed pipe column is pressed, and the like. The method is characterized by mainly comprising the following steps:
(1) The underground tools are reduced, but the underground tools have the functions of plugging, throttling, sand prevention and anti-blocking.
(2) The number of times of lifting and lowering the speed pipe can be reduced at least twice in the whole exploitation process.
(3) The construction process is reduced, the construction cost is saved, and the secondary pollution of the gas well is avoided.
(4) The construction safety is improved, and the safety and reliability of the operation under pressure are ensured.
2. The automatic adjustment of the throttle production by the pressure in the well is realized for the first time. The pressure in the well is high, the drift diameter of the throttling nozzle is small, and when the pressure in the well is low, the drift diameter of the throttling nozzle is increased, so that the liquid carrying capacity of gas can be effectively ensured, and the whole life production cycle of the gas well is prolonged.
3. After the long-time production of the speed pipe, a sliding sleeve or a single-valve (failure, the secondary plugging operation can be performed by using a drop-in type sitting stopper rod) is preset, so that the problem that the inside of the pipe cannot be plugged when the pipe is lifted up when the speed pipe is used for producing a long-time production well under pressure in China is solved.
4. The bottom end of the plug is provided with magnetism, and the magnetic material falls into the bottom end of the multifunctional throttling blanking plug at the tail end of the speed pipe after the plug is removed, so that the blocking head can be prevented from ascending and a gas-liquid flow channel is blocked in the exploitation process.
Drawings
FIG. 1 is a block diagram of a multi-function throttle plug at the tail end of a speed tube;
FIG. 2 is a view of a plunge-type seating stopper configuration;
FIG. 3 is a schematic illustration of a multi-functional choke plug connection well at the tail end of a velocity stack;
FIG. 4 is a state of maximum compression, a state of motion of the piston rod;
FIG. 5 is a 20MPa state, a piston rod movement state;
FIG. 6 is a 10MPa state, a piston rod movement state;
fig. 7 is a state of movement of the piston rod in the absence of pressure.
In the figure: 1. throw-in type seating stopper rod; 1-1, an upper end body; 1-2, a first O-shaped rubber ring; 1-3, claw joints; 1-4, clamping jaws; 1-5, leading cone; 2. rolling the joint; 3. the second O-shaped rubber ring; 4. a screw; 5. a third O-shaped rubber ring; 6. a short joint is located; 7. an outer housing; 8. a fourth O-shaped rubber ring; 9. a spring pad; 10. a single-flap valve; 11. a sliding sleeve; 12. a first steel ball; 13. a second steel ball; 14. a sliding sleeve shear ring; 15. a choke shear ring; 16. a first shear pin; 17. a throttle nozzle; 18. a fifth O-shaped rubber ring; 19. a sixth O-shaped rubber ring; 20. a throttle lever; 21. seventh O-shaped rubber ring; 22. a piston rod; 23. eighth O-shaped rubber ring; 24. a compression spring; 25. a ninth O-shaped rubber ring; 26. a threaded ring; 27. a throttle outer cylinder; 28. plugging the sleeve; 29. tenth O-shaped rubber ring; 30. a plug; 31. a second shear pin; 32. a screen pipe; 33. a lower joint; 34. a multifunctional throttling blanking plug at the tail end of a speed pipe.
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, but are not limited thereto. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the multifunctional throttling plug at the tail end of a speed pipe comprises a drop-in type seating plug rod 1, a rolling joint 2, a seating nipple 6, an outer shell 7, a sliding sleeve 11, a throttling nozzle 17, a throttling outer cylinder 27, a plug sleeve 28, a screen pipe 32 and a lower joint 33; the drop-in type seat stopper rod 1 is arranged in the rolling joint 2, the lower end of the rolling joint 2 is connected with the upper end of the seat nipple 6 through threads, the lower end of the seat nipple 6 is connected with the upper end of the outer shell 7 through threads, the lower end of the outer shell 7 is connected with the upper end of the throttling outer barrel 27 through threads, and a plurality of single flap valves 10 are circumferentially arranged in the upper end of the outer shell 7; the sliding sleeve 11 is arranged in a cavity formed by a plurality of single-flap valves 10, the upper end of the sliding sleeve 11 is provided with a spring pad 9, the lower end of the sliding sleeve 11 is sequentially provided with a sliding sleeve shearing ring 14 and a throttling mouth shearing ring 15, and the bottom of the sliding sleeve 11 is connected with a throttling mouth 17 through a first shearing pin 16; the throttle outer cylinder 27 is internally provided with a throttle rod 20, a piston rod 22, a compression spring 24 and a threaded ring 26 in sequence from top to bottom; the lower end of the throttling outer cylinder 27 is connected with a plug sleeve 28 and a screen pipe 32 and a lower joint 33 sequentially through threads, and a plug 30 is arranged in the plug sleeve 28.
As shown in fig. 3, the invention also provides a method for using the multifunctional throttling blanking plug at the tail end of the speed pipe, which comprises the following steps:
step one: the multifunctional throttling plug 34 at the tail end of the speed pipe is installed before entering the well;
step two: logging in a well of the multifunctional throttling plug at the tail end of the speed pipe;
step three: opening a multifunctional throttling blanking plug at the tail end of the speed pipe;
after the multifunctional throttling plug at the tail end of the speed pipe is lowered to the design position, injecting liquid from the speed pipe, when the pressure is raised to the design pressure of the plug at the lower end of the multifunctional throttling plug at the tail end of the speed pipe, suddenly reducing the pressure, indicating that the plug 30 is opened, entering a production stage, and if the pressure exceeds 1.5-2 times of the design pressure of the plug, when no pressure drop occurs, taking out the multifunctional throttling plug at the tail end of the speed pipe, and re-entering the well after inspection;
step four: production is carried out by means of the pressure in the well;
in the production process, the pressure outside the speed pipe is kept to be more than 6MPa higher than the pressure inside the speed pipe, and if the pressure outside the speed pipe is less than the pressure inside the speed pipe, the next work is needed;
step five: removing the throttle 17 for secondary production;
step six: when the speed pipe is required to be lifted out, the speed pipe is plugged once;
step seven: when the primary plugging fails, secondary plugging in the pipe is carried out;
step eight: and (3) lifting out the speed pipe and a multifunctional throttling blanking plug at the tail end of the speed pipe.
Example 2
On the basis of the embodiment 1, as shown in fig. 1, further, the throttle lever 20 comprises a connecting rod and a throttle sleeve, one end of the connecting rod is connected with the throttle 17, the other end of the connecting rod is connected with the throttle sleeve, the throttle sleeve is connected with a threaded ring 26, and the threaded ring 26 is arranged at the lower end of the throttle outer cylinder 27; the compression spring 24 is arranged in the throttling sleeve, the upper end of the piston rod 22 can slide up and down in the connecting rod, and the lower end of the piston rod is arranged on the compression spring 24; the throttle sleeve is sequentially provided with 2-5 through holes along the shaft, the center of the upper end of the piston rod 22 is axially provided with an air flow channel, the side wall of the piston rod 22 is provided with an air flow hole, and the air flow channel can be communicated with the throttle sleeve through the air flow hole.
Further, the plug 30 is fixedly connected with the plug sleeve 28 through a second shear pin 31, and the bottom of the plug 30 is provided with magnetism.
As shown in fig. 2, the plunge-type seating stopper 1 includes: the upper end body 1-1, the claw joint 1-3, the claw 1-4 and the guiding cone 1-5, wherein the lower end of the upper end body 1-1 is connected with the guiding cone 1-5, the claw joint 1-3 is sleeved on the guiding cone 1-5, the lower end of the claw joint 1-3 is connected with the claw 1-4, and the claw 1-4 can slide on the guiding cone 1-5.
The upper end body 1-1 is provided with at least one annular sealing groove, and a first O-shaped rubber ring 1-2 is arranged in the annular sealing groove.
The cone guiding device is characterized in that the cone guiding device 1-5 is an integrated structure composed of a cone structure at the bottom end, a conical structure at the middle part and a cylinder at the upper end, wherein the small end of the conical structure is connected with the cylinder, and the large end of the conical structure is connected with the cone structure.
A fourth O-shaped rubber ring 8 is arranged at the joint of the lower end of the seating nipple 6 and the outer shell 7; a fifth O-shaped rubber ring 18 is arranged at the joint of the lower end of the outer shell 7 and the upper end of the throttling outer cylinder 27.
The application method of the multifunctional throttling blanking plug at the tail end of the speed pipe comprises the following steps:
step one: the multifunctional throttling plug 34 at the tail end of the speed pipe is installed before entering the well;
the multifunctional throttling plug at the tail end of the speed pipe needs to be carefully inspected and maintained before entering the well, and other parts except the drop-in type seating stopper rod 1, the first steel ball 12 and the second steel ball 13 are connected in sequence to ensure the fastening of the parts;
step two: logging in a well of the multifunctional throttling plug at the tail end of the speed pipe;
after the multifunctional throttling plug at the tail end of the speed pipe is checked to be qualified on the ground, the rolling joint 2 is installed at the lowest end of the speed pipe column, the pipe column is slowly lowered, the speed is not more than 5m/min, the multifunctional throttling plug at the tail end of the speed pipe is ensured to be in the well, the speed pipe is continuously lowered, 50m is slowly lowered to observe the running condition of equipment, the lowering speed is controlled within 25m/min after the equipment runs normally, and the lifting suspension weight test is carried out once every 500m lower in the lowering process;
step three: opening a multifunctional throttling blanking plug at the tail end of the speed pipe;
after the multifunctional throttling plug at the tail end of the speed pipe is lowered to the design position, injecting liquid from the speed pipe, when the pressure rises to the design pressure of the plug 30 at the lower end of the multifunctional throttling plug at the tail end of the speed pipe, the opening pressure of the plug is generally 2-5MPa, the pressure suddenly drops, the plug 30 is opened, the production stage can be started, if the pressure exceeds 1.5-2 times of the design pressure of the plug 30, the multifunctional throttling plug at the tail end of the speed pipe is required to be started when no pressure drop exists, and the well is restarted after inspection;
step four: production is carried out by means of the pressure in the well;
in the production process, the pressure outside the speed pipe is kept to be more than 6MPa higher than the pressure inside the speed pipe, and if the pressure outside the speed pipe is less than the pressure inside the speed pipe, the next work is needed;
step five: removing the throttle 17 for secondary production;
the first steel ball 12 is put into the speed pipe, then liquid is injected from the speed pipe, when the pressure rises to the design pressure of the multifunctional throttling plug at the tail end of the speed pipe, the pressure is generally 20MPa, the pressure suddenly drops, the throttling nozzle 17 falls into the inner cavity of the throttling outer cylinder 27, and secondary production can be carried out;
step six: when the speed pipe is required to be lifted out, the speed pipe is plugged once;
the second steel ball 13 is put into the speed pipe, then liquid is injected into the oil pipe, when the pressure rises to the design pressure of the multifunctional throttling plug at the tail end of the speed pipe, the pressure is generally 30MPa, the sliding sleeve 11 drops into the bottom of the multifunctional throttling plug at the tail end of the speed pipe, the well is opened for pressure release, and the observation is carried out, if the drop in the speed pipe is 0, the well is closed for observation, and if the pressure is still 0, the single-flap valve 10 acts, so that the speed pipe column can be started; if the pressure in the speed pipe is not 0, the single-flap valve 10 is not operated, and secondary plugging can be performed;
step seven: when the primary plugging fails, secondary plugging in the pipe is carried out;
when primary plugging fails, when the speed pipe is required to be lifted up with pressure, the input type seating plug rod 1 is input from a wellhead, and gravity is utilized for a vertical well to enable the input type seating plug rod 1 to enter a seating nipple 6 in the speed pipe, so that the plugging of the speed pipe in the well is realized; for a speed pipe which is lowered to a high inclination or a horizontal well section of the speed pipe and needs pumping, the input type sitting stopper rod 1 is pushed into the sitting nipple 6, the well is closed, the upper end body 1-1, the O-shaped rubber ring 1-2 and the guiding cone 1-5 are pushed to ascend by virtue of bottom hole pressure, and the claw joint is connected with the claw 1-4 and expands at the outer diameter of the large end of the cone of the guiding cone 1-5, so that the plugging in an oil pipe is realized;
step eight: and (3) lifting out the speed pipe and a multifunctional throttling blanking plug at the tail end of the speed pipe.
Preferably, the liquid is liquid nitrogen.
Example 3
On the basis of the embodiment 2, further, the inner diameter of the through hole on the throttling sleeve is 0.1-1mm; preferably, the inner diameter is 0.5 or 1mm; the distance between two adjacent through holes is 7-20mm; the preferred distance is 10 or 15mm. Preferably, the number of the through holes is 4.
Further, the inner diameter of the air flow passage of the piston rod 22 should be larger than the total diameter of the through hole provided in the throttle sleeve.
Further, a cylindrical piston is disposed at the lower end of the piston rod 22, and a compression spring 24 is fixed to the piston at one end and abuts against the inner end surface of the upper end of the throttle sleeve at the other end.
Further, a seventh O-shaped rubber ring 21 is arranged outside the upper end of the piston rod 22 and is used for sealing the connecting rod; an eighth O-shaped rubber ring 23 and a ninth O-shaped rubber ring 25 are respectively arranged on the piston rod 22 at the position which is in up-down contact with the throttling sleeve and are used for realizing the sealing of the upper end and the lower end of the throttling sleeve, wherein the ninth O-shaped rubber ring 25 is arranged on the piston.
Further, after the rolling joint 2 is in threaded connection with the seat nipple 6, the rolling joint is fixed by a screw 4, and meanwhile, the outer diameter of the input type seat stopper rod 1 is slightly smaller than or equal to the inner diameter of the rolling joint 2; the inner diameter of the locating nipple 6 is slightly larger than the outer diameter of the drop type locating stopper 1, a certain gap is formed, the length is larger than the length of the drop type locating stopper 1, a step is arranged at the lower end of the rolling joint 2, the rolling joint is used for pushing the upper end body 1-1 of the drop type locating stopper 1, the O-shaped rubber ring 1-2 and the leading cone 1-5 to ascend by means of bottom hole pressure, the claw joint 1-3 is connected with the claw 1-4 to expand on the outer diameter of the cone large end of the leading cone 1-5, and the inner sealing of an oil pipe is realized by clamping the step.
Further, the upper end and the lower end of the rolling joint 2 are respectively provided with an annular sealing groove, and sealing rings are arranged in the annular sealing grooves.
Preferably, a plurality of annular sealing grooves at the upper end of the rolling joint 2 can be arranged, the sealing rings are second O-shaped rubber rings 3, and a plurality of sealing rings are sequentially arranged to achieve multi-layer safety sealing; the sealing ring at the lower end of the rolling joint 2 is a third O-shaped rubber ring 5, and one sealing ring is needed.
Further, the spring pad 9 is sleeved on the upper end face of the sliding sleeve 11.
Further, the first shear pins 16 are two groups, and the sliding sleeve 11 and the throttle mouth 17 are connected through the two groups of first shear pins 16. The two groups of first shear nails 16 are arranged in an upper layer and a lower layer, and 3-5 shear nails in each group are: 3-5 shear nails are arranged on each layer; the first layer of shear pins connect the sliding sleeve shear ring 14 with the sliding sleeve 11; the second layer of shear pins connects the choke shear ring 15 with the choke 17.
The opening pressure of the two groups of first shear nails 16 should be different, and preferably, the opening pressure of the throttle mouth 17 does not exceed 20MPa; preferably, the opening pressure of the sliding sleeve 11 is not more than 30MPa. But the opening pressure of the choke 17 must be less than the opening pressure of the sliding sleeve 11.
Further, a sixth O-shaped rubber ring 19 is arranged at the lower end of the throttle nozzle 17, and the outer diameter of the throttle nozzle 17 is smaller than the inner diameter of the sliding sleeve 11 by 2-3mm.
Preferably, the connecting rod of the throttle lever 20 is connected with the throttle 17 through threads.
Preferably, the plug 30 is disposed at the lower end of the plug sleeve 28, and the pressure for opening the plug is not more than 3MPa. The opening pressure is not easy to be too high, liquid is arranged outside the plug, and the pressure is very high along with the increase of the well depth.
The invention relates to a speed pipe tail end multifunctional throttling blanking plug, which comprises the following specific working procedures:
1. plugging during well logging:
the multifunctional throttling plug at the tail end of the speed pipe is connected to the lowest end of the speed pipe to enter a well, at the moment, gas and liquid in the well enter the bottom end of the plug through holes of the sieve tube, and under the action of the plug, the gas and the liquid are prevented from entering the speed pipe through the multifunctional throttling plug at the tail end of the speed pipe, and when the speed pipe is put into the speed pipe, the inside of the speed pipe is plugged.
2. Opening the inside of the multifunctional throttling blanking plug at the tail end of the speed pipe and the gas-liquid channel:
after the multifunctional throttling plug at the tail end of the speed pipe is lowered to the design position, injecting liquid from the speed pipe, and when the pressure is raised to the design pressure of the plug at the lower end of the multifunctional throttling plug at the tail end of the speed pipe, suddenly reducing the pressure to indicate that the plug is opened and can enter the production stage; the plug falls into the inner cavity of the lower joint along the inner wall of the sieve tube, and the bottom of the plug is adsorbed with the lower joint all the time under the magnetic action, so that the multifunctional throttling plug at the tail end of the speed tube is prevented from being pushed by gas and liquid to cause the plug to return upwards and back to block the production channel in the production process.
If the pressure exceeds 1.5-2 times of the design pressure of the plug, and no pressure drop exists, the multifunctional throttling plug at the tail end of the speed pipe needs to be lifted out, and the well is restarted after inspection.
3. Throttling production as pressure in the well changes at high pressure:
in the initial stage of production, the pressure in the oil gas well is high, and the multifunctional throttling plug at the tail end of the speed pipe can perform throttling production. The gas and liquid in the well enter the cavity of the multifunctional throttling plug at the tail end of the speed pipe through the holes of the sieve tube, and the ninth O-shaped sealing ring 25 is arranged on the piston to prevent the gas and liquid from passing through, so that a certain thrust is generated on the bottom of the piston end by part of the gas and liquid, the compression spring 24 is compressed, and the compression distance generated is large due to high pressure in the well; after the other part of gas-liquid flow enters the inner cavities of the throttle rod and the throttle outer cylinder, the gas-liquid flow enters the inner cavity of the throttle rod through a through hole at the uppermost end of the throttle rod, and then enters a gas-liquid channel at the upper part of the piston rod to enter the speed pipe; because only one passage is opened, the throttle effect is well achieved.
In the exploitation process, the pressure in the well gradually becomes smaller, gas and liquid in the well enter the cavity of the multifunctional throttling plug at the tail end of the speed pipe through the holes of the sieve tube, the force acting on the cylindrical piston becomes smaller, the compression spring starts to stretch under the action of self elasticity, when the compression spring stretches to a certain distance, the piston is opened, the second through hole at the uppermost end of the throttling rod is opened, so that the gas and liquid enter the inner cavity of the throttling rod, at the moment, the total diameter of a runner on the throttling rod is increased, and compared with the production of one through hole, the throttling is reduced.
And as the pressure in the well is reduced, a third through hole and a fourth through hole on the throttle rod are sequentially opened, and only until the stroke of the spring is completely reset, all channels on the throttle rod are opened to start production.
3. Full-drift diameter production:
if the gas well production process needs full-diameter production, a first steel ball is put into the speed pipe, then liquid or liquid nitrogen is injected into the oil pipe, and the liquid or liquid nitrogen acts on the first shear pin. Because the first shear pin has an upper layer and a lower layer, the lower layer shear pin is lower than the upper layer shear pin, so the lowest layer shear pin is opened first, when the pressure is suddenly reduced, the throttle mouth shear ring 15 is separated from the throttle mouth 17, the throttle mouth, the throttle rod, the piston rod, the spring, the threaded ring and the like are enabled to descend, and after entering the inner cavity of the throttle outer cylinder, the full-diameter production can be performed.
4. The speed tube is required to be lifted out, so that the speed tube can be plugged once.
The second steel ball 13 is put into the speed pipe, and then the liquid is injected into the oil pipe to act on the upper layer of the first shear pin. When the pressure rises to the design pressure of the multifunctional throttling plug at the tail end of the speed pipe, and the pressure suddenly drops, the sliding sleeve 11 falls into the bottom of the multifunctional throttling plug at the tail end of the speed pipe, at the moment, the single-flap valve is opened under the action of the self spring structure, and the inner channel of the multifunctional throttling plug at the tail end of the speed pipe is closed, so that the single-flap valve is a conventional technology and will not be described. Opening the well, releasing pressure, observing, if the pressure in the speed pipe is 0, closing the well, and if the pressure is 0, indicating that the single-flap valve 10 plays a role, namely, a speed pipe column can be started; if the pressure in the speed pipe is not 0, the single-flap valve 10 is not activated, and secondary plugging can be performed.
5. The speed tube is required to be lifted out, so that the inside of the speed tube can be plugged secondarily.
The single-valve is extremely easy to fail under long-time production in the well, and can cause first plugging failure, and the first plugging failure is used for secondary plugging. The drop-in type sitting stopper rod is dropped into the speed pipe from the wellhead, and gravity is utilized to enable the drop-in type sitting stopper rod 1 to enter the sitting nipple 6 for a vertical well, so that the plugging of the speed pipe in the well is realized; for a speed pipe down to a high slope or horizontal well section, pumping is required, and the drop-in type landing plug is pushed into the landing nipple by liquid. And closing the well, pushing the upper end body, the rubber ring and the guide cone to move upwards by means of bottom hole pressure, and expanding the claw joint at the outer diameter of the large end of the cone of the guide cone by connecting the claw, so as to realize secondary plugging in the oil pipe.
Application example:
the compression spring is designed into a spiral spring with a circular section, the maximum load is set to 1200N, the effective piston area is designed to be 50.26mm, and the compression spring is designed in a size of: spring material 70-C, material diameter 6mm, shear modulus 79000MPa, effective turns 18, allowable shear stress 660MPa, total turns 20:
1. maximum compression state: when the down-hole pressure reaches over 23.9MPa, the piston rod is pressed to the bottom end, the compression distance is 70mm, and only the first through hole phi 1.5mm on the left side is opened, as shown in fig. 4.
In the state of 2.20MPa, the piston moves backwards, the compression distance is shortened by 10mm, the second through hole phi 1.5mm runner is opened, and the total diameter of the two runners is equivalent to phi 2.12mm at the moment, as shown in fig. 5.
In the state of 3.10MPa, the piston moves backwards, the compression distance is shortened by 30mm, the flow passage with the third through hole phi of 2.1mm is opened, and the total diameter of the three flow passages is equivalent to phi of 2.97mm at the moment, as shown in fig. 6.
4. When no pressure is applied, the spring returns to its natural length and the piston rod is restrained by the threaded ring as shown in fig. 7.
Aiming at the defects existing in the prior art, the invention effectively solves the problems of the speed string well completion process under the condition of not changing the speed string well completion process and the operation process by effectively solving the difficult problems. The multifunctional throttling blanking plug at the tail end of the speed pipe belongs to a combination tool, has strong functionality and wider treatment problem range, and can realize the blocking in the pipe when the speed pipe is put down; when the pressure of a gas well is high in the initial stage of exploitation, the gas well has the functions of throttling and depressurization production; during the exploitation process, the sand control and blocking-back functions are provided; in the later period of exploitation, the full-drift diameter exploitation of the speed pipe can be realized; when the pipe column needs to be replaced, the plugging function in the pipe column can be realized. The invention has the main significance of:
(1) Reducing downhole tools, but having the functions of plugging, throttling, sand prevention and blocking prevention;
(2) In the whole exploitation process, the times of lifting and lowering the speed pipe at least twice can be reduced; the invention can reduce the times of lifting and lowering the speed pipe at least twice in the whole exploitation process. Because the cost of the continuous oil pipe vehicle for 1 hour is about 0.58 ten thousand yuan, the next time is more than 10 hours, and only the continuous oil pipe vehicle can save 11.6 ten thousand yuan; if other costs such as relocation, installation, well killing or operation under pressure are added; the single well saves at least 30 ten thousand yuan. 500 times are expected to be used within 3-5 years: 30 x 500=15000 (ten thousand yuan). The operation cost is comprehensively reduced by 15000 ten thousand yuan.
(3) The construction process is reduced, the construction cost is saved, and the secondary pollution of a gas well is avoided;
(4) The construction safety is improved, and the safety and reliability of the operation under pressure are ensured.
The foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention. The components and structures not specifically described in this embodiment are well known in the art and are not described in detail herein.
Claims (6)
1. A multifunctional throttling plug at the tail end of a speed pipe is characterized in that: comprises a drop-in type seating stopper, a rolling joint, a seating nipple, an outer shell, a sliding sleeve, a throttling nozzle, a throttling outer cylinder, a plugging sleeve, a sieve tube and a lower joint; the drop-in type seating plug rod is placed in the rolling joint, the lower end of the rolling joint is connected with the upper end of the seating nipple through threads, the lower end of the seating nipple is connected with the upper end of the outer shell through threads, the lower end of the outer shell is connected with the upper end of the throttling outer cylinder through threads, and a plurality of single flap valves are circumferentially arranged in the upper end of the outer shell; the sliding sleeve is arranged in a cavity formed by a plurality of single-flap valves, the upper end of the sliding sleeve is provided with a spring pad, the lower end of the sliding sleeve is sequentially provided with a sliding sleeve shearing ring and a throttling mouth shearing ring, and the bottom of the sliding sleeve is connected with the throttling mouth through a first shear pin; a throttle rod, a piston rod, a compression spring and a thread ring are sequentially arranged in the throttle outer cylinder from top to bottom; the lower end of the throttling outer cylinder is connected with a plug sleeve and a screen pipe through threads in sequence, and a plug is arranged in the plug sleeve;
the throttle rod comprises a connecting rod and a throttle sleeve, one end of the connecting rod is connected with the throttle mouth, the other end of the connecting rod is connected with the throttle sleeve, the throttle sleeve is connected with a thread ring, and the thread ring is arranged at the lower end of the throttle outer cylinder; the compression spring is arranged in the throttling sleeve, the upper end of the piston rod can slide up and down in the connecting rod, and the lower end of the piston rod is arranged on the compression spring; 2-5 through holes are sequentially formed in the throttle sleeve along the shaft, an air flow channel is axially formed in the center of the upper end of the piston rod, air flow holes are formed in the side wall of the piston rod, and the air flow channel can be communicated with the throttle sleeve through the air flow holes;
the plug is fixedly connected with the plug sleeve through a second shear pin, and the bottom of the plug is provided with magnetism;
the drop-in type sitting stopper rod comprises: the upper end body is connected with the guide cone, the jaw joint is sleeved on the guide cone, the lower end of the jaw joint is connected with the jaw, and the jaw can slide on the guide cone;
the upper end body set up at least one annular seal groove, be provided with first O type rubber ring in the annular seal groove.
2. A speed tube tail end multifunctional throttle plug as claimed in claim 1, characterized in that: the cone is an integrated structure composed of a cone structure at the bottom end, a conical structure at the middle part and a cylinder at the upper end, wherein the small end of the conical structure is connected with the cylinder, and the large end of the conical structure is connected with the cone structure.
3. A speed tube tail end multifunctional throttle plug as claimed in claim 1, characterized in that: a fourth O-shaped rubber ring is arranged at the joint of the lower end of the sitting nipple and the outer shell; the fifth O-shaped rubber ring is arranged at the joint of the lower end of the outer shell and the upper end of the throttling outer cylinder.
4. A method for using a multifunctional throttling blanking plug at the tail end of a speed pipe according to any one of claims 1-3, which is characterized in that: the method comprises the following steps:
step one: the multifunctional throttling plug at the tail end of the speed pipe is installed before entering the well;
step two: logging in a well of the multifunctional throttling plug at the tail end of the speed pipe;
step three: opening a multifunctional throttling blanking plug at the tail end of the speed pipe;
after the multifunctional throttling plug at the tail end of the speed pipe is lowered to the design position, injecting liquid from the speed pipe, when the pressure is raised to the design pressure of the plug at the lower end of the multifunctional throttling plug at the tail end of the speed pipe, suddenly reducing the pressure, indicating that the plug is opened, entering a production stage, and if the pressure exceeds 1.5-2 times of the design pressure of the plug, when no pressure drop occurs, lifting the multifunctional throttling plug at the tail end of the speed pipe, and re-entering the well after inspection;
step four: production is carried out by means of the pressure in the well;
in the production process, the pressure outside the speed pipe is kept to be more than 6MPa higher than the pressure inside the speed pipe, and if the pressure outside the speed pipe is less than the pressure inside the speed pipe, the next work is needed;
step five: the throttle nozzle is knocked off for secondary production;
step six: when the speed pipe is required to be lifted out, the speed pipe is plugged once;
step seven: when the primary plugging fails, secondary plugging in the pipe is carried out;
step eight: and (3) lifting out the speed pipe and a multifunctional throttling blanking plug at the tail end of the speed pipe.
5. The method for using the multifunctional throttling blanking plug at the tail end of the speed pipe according to claim 4, wherein the method comprises the following steps: the specific process of the step six is as follows: the second steel ball is put into the speed pipe, then liquid is injected into the oil pipe, when the pressure rises to the design pressure of the multifunctional throttling plug at the tail end of the speed pipe, the pressure suddenly drops, the sliding sleeve falls into the bottom of the multifunctional throttling plug at the tail end of the speed pipe, the well is opened and the pressure is released, if the pressure in the speed pipe drops to 0, the well is closed again for observation, and if the pressure is still 0, the single-flap valve plays a role, and a speed pipe column can be started; if the pressure in the speed pipe is not 0, the single flap valve is not operated, and secondary plugging can be performed.
6. The method for using the multifunctional throttling blanking plug at the tail end of the speed pipe according to claim 4, wherein the method comprises the following steps: the drop-in type sitting stopper rod comprises: the upper end body is connected with the guide cone, the jaw joint is sleeved on the guide cone, the lower end of the jaw joint is connected with the jaw, and the jaw can slide on the guide cone; the specific process of the step seven is as follows: when primary plugging fails, when the speed pipe is required to be lifted up with pressure, the input type seating plug rod is input from a wellhead, and gravity is utilized for a vertical well to enable the input type seating plug rod to enter a seating nipple in the speed pipe, so that the plugging of the speed pipe in the well is realized; and (3) pumping the speed pipe which is lowered to a high inclination or a horizontal well section by the speed pipe, pushing the input type sitting stopper rod into the sitting nipple, closing the well, and pushing the upper end body, the first O-shaped rubber ring and the guiding cone to ascend by means of bottom hole pressure, wherein the claw joint is connected with the claw to expand at the outer diameter of the large end of the cone of the guiding cone, so that the plugging in the oil pipe is realized.
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