CN114961656B - Gas lift production string with pressure limiting fracture plug device and oil well plugging operation method - Google Patents
Gas lift production string with pressure limiting fracture plug device and oil well plugging operation method Download PDFInfo
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- CN114961656B CN114961656B CN202210526289.5A CN202210526289A CN114961656B CN 114961656 B CN114961656 B CN 114961656B CN 202210526289 A CN202210526289 A CN 202210526289A CN 114961656 B CN114961656 B CN 114961656B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 50
- 230000000670 limiting effect Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003129 oil well Substances 0.000 title abstract description 9
- 238000003780 insertion Methods 0.000 claims abstract description 26
- 230000037431 insertion Effects 0.000 claims abstract description 26
- 239000000919 ceramic Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 32
- 238000007667 floating Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000000243 solution Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 2
- 229910052755 nonmetal Inorganic materials 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 239000007789 gas Substances 0.000 description 63
- 230000008569 process Effects 0.000 description 10
- 239000007788 liquid Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000002147 killing effect Effects 0.000 description 4
- 230000002829 reductive effect Effects 0.000 description 4
- 238000002627 tracheal intubation Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 210000005239 tubule Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
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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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells 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
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/063—Valve or closure with destructible element, e.g. frangible disc
-
- 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
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
-
- 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
- E21B43/121—Lifting well fluids
- E21B43/122—Gas lift
- E21B43/123—Gas lift valves
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a gas lift production string with a limited pressure fracture plug device and an oil well plugging operation method, comprising a releasing cannula packer, a full-diameter baffle switch and a screen pipe which are sequentially connected in series, wherein the releasing cannula packer is in sliding connection with the production string, the production string comprises a tubing hanger, a jacketed tubing, an underground safety valve, a plurality of gas lift valves, a tubing, a preset working cylinder and an insertion pipe which are sequentially connected in series, and the pressure limiting fracture plug device is arranged above each gas lift valve, and the insertion pipe is in sliding connection with the releasing cannula packer. The invention is provided with the jacketed oil pipe, so that the production channel of the underground safety valve can be closed in time through the ground, and the energy loss and the safety accidents are avoided. Meanwhile, the pressure limiting rupture plug device is internally provided with a bowl-shaped downward ceramic disc rupture disc, and the rupture disc can be broken and a thorough full-diameter structure for unblocking and opening can be realized only by driving a pressure value exceeding the limit of the pressure difference bearable by the concave surface of the rupture disc from a wellhead.
Description
Technical Field
The invention relates to the technical field of oil and gas well operation under pressure, in particular to a gas lift production string with a limited pressure fracture plug device and an oil well plugging operation method.
Background
Gas lift oil recovery refers to an artificial lifting method for artificially injecting high-pressure gas from the ground into an oil well with stopping-spraying (intermittent spraying or self-spraying capability is poor) so as to reduce the flow pressure gradient (gas-liquid mixture density) in a lifting pipe and lifting liquid by using the energy of the gas.
The working medium of gas lift can be high-pressure gas such as natural gas, nitrogen and the like, and the underground equipment is simple. Therefore, the method has stronger adaptability, is suitable for oil extraction and gas production of vertical wells, inclined wells, cluster wells, horizontal wells and slim-hole wells with high gas-liquid ratio, and can also be used for oil well blowout induction or fracturing acidification yield increase measure wells and workover drainage operations. The lifting depth and the displacement of the gas lift are flexible to change, and the wellhead and the underground equipment are simpler and convenient to manage. Under the oil well conditions of high gas-liquid ratio, sand and corrosive medium, the method has more advantages than other manual lifting modes.
The low-pressure low-energy well usually implements semi-closed gas lift tubular column production, so that the influence of gas injection pressure on the stratum can be eliminated, and the yield is improved. However, in the packer setting process and the fracturing, acidizing and yield increasing operation process, well repairing and killing liquid and corrosive medium are found to easily infiltrate into an oil-gas layer, so that the gas layer is polluted, and the yield of the oil-gas well is seriously influenced. Therefore, the matched plugging technology is perfected, and the stratum is protected from being polluted by well repairing well-killing liquid and corrosive medium in the pressurized operation or the non-well-killing operation.
In the embodiment 1 of the patent CN201921405984.6, since the arc ceramic disc is disposed between the upper joint 1 and the lower joint 2, and the pressures born by the two surfaces of the arc ceramic disc are different, the effect of sealing or communicating according to different pressure values is achieved, specifically, after the pipe string is put down, the fluid is pumped into the pipe to suppress the rupture of the arc ceramic disc, so that the purpose of communicating the pipe string with the well is achieved. The problem that the ceramic disc is exploded through pressure holding in a lower pressure state after the completion of part of the well can be effectively solved; however, when the underground pressure is greater than 35MPa, the pressure in the oil pipe is required to be greater than the pressure in the well and the pressure in the oil pipe is required to be greater than a certain explosion coefficient, and the explosion ceramic disc can be exploded, and the pressure-bearing coefficient of ground facilities is required to be higher, so that accidents are easily caused by the way of suppressing the pressure to the explosion ceramic disc; meanwhile, when the production pipe column descends or in the transportation process, the rupture disc is ruptured in advance.
Disclosure of Invention
The invention aims to: aiming at the prior art, a production string structure with a pressure lifting function is provided.
The technical scheme is as follows: the utility model provides a take pressure to play gas lift production tubular column structure down, includes the back-up intubate packer, full latus rectum baffle switch and the screen pipe of concatenating in proper order, back-up intubate packer sliding connection production tubular column, the production tubular column is including the oil pipe hanger, jacket formula oil pipe, downhole safety valve, a plurality of gas lift valves, oil pipe, preset working cylinder, the insert tube of concatenating in proper order, every the top of gas lift valve all is equipped with the pressure limiting and breaks the stopper device, insert tube sliding connection in the back-up intubate packer, the top of oil pipe hanger still is equipped with the operation machine device that presses in area.
Preferably, a capillary tube is further arranged on one side of the jacketed oil tube, one end of the capillary tube is connected with the underground safety valve, and the other end of the capillary tube penetrates through the oil tube hanger and is connected with the pressurized working machine device.
Preferably, the connection parts of the capillary tube, the oil pipe hanger and the underground safety valve are respectively provided with a clamping sleeve for sealing.
Preferably, the pressure limiting fracture plug device comprises an upper connector, the upper connector is connected with an oil pipe and connected with the pipe channeling at the lower end of the underground safety valve in parallel, the lower part of the upper connector is connected with a lower connector in a threaded manner, and a rupture disc is arranged in the lower connector.
Preferably, the lower part of the rupture disc is also in sealing connection with a first sealing ring, the lower part of the upper joint is also provided with a wave spring, the lower part of the wave spring is provided with a floating ring, the lower part of the floating ring is connected with the rupture disc, and a second sealing ring is arranged between the rupture disc and the floating ring.
Preferably, the rupture disc is made of ceramic.
Preferably, the lower part of the preset working cylinder is connected with a tail plug in a threaded manner, and a soluble fracture plug is arranged in the tail plug.
Preferably, the piston in the full-diameter baffle switch tube is connected with a mandrel, one end of the mandrel is in contact connection with the insertion tube, the other end of the mandrel is in contact with the connection valve, and the mandrel drives the valve to open and close.
An oil well plugging operation method comprises the following steps:
installing a blowout preventer and a ground pressurized working machine device on a wellhead oil pipe head; under the condition of pressurized operation, a releasing pipe inserting packer, a full-diameter baffle switch and a releasing pipe column connected in series with a sieve tube are arranged above an oil layer in a well bore, the releasing pipe inserting packer is sealed and anchored at the upper end of the oil layer casing through a rubber sleeve and a slip after the releasing pipe column releases, the full-diameter baffle switch and a baffle are in a closed state, and at the moment, the oil layer is sealed with the sleeve at the upper end of the packer;
taking out the oil pipe and the releasing tool after the releasing pipe column is released, sequentially lowering an insertion pipe, arranging a tail plug and a preset working cylinder on the insertion pipe, continuously lowering a plurality of gas lift valves connected with a limited pressure fracture plug device, wherein the gas lift valves are arranged between the limited pressure fracture plug device and the oil pipe, then lowering an underground safety valve and a jacket type oil pipe capable of realizing the pressurized lifting, sealing the underground safety valve with a clamping sleeve and a capillary tube, integrally lowering the underground safety valve and each jacket type oil pipe and an oil pipe hanger of an oil sealing sleeve annulus of a ground wellhead, pushing a mandrel to move downwards to jack up a baffle after the insertion pipe is inserted into a full-diameter baffle switch, opening a stratum passage at the moment, and completing the gas lift production pipe column;
after the underground safety valve is opened on the ground, pressurizing and sequentially knocking the nonmetal pressure limiting rupture plug device at the upper end of the pressure-lifting valve and the rupture plug in the tail plug at the tail end of the explosion-lifting valve from the wellhead to a through production layer, wherein a soluble rupture plug is arranged in the tail plug, pressurizing and knocking off the soluble rupture plug during well completion, the soluble rupture plug falls to the bottom of the well, the production layer is through, and is dissolved into powder with a medium after a few days, and is discharged together with a gas lifting solution;
after the gas lift production string is completed, annular gas injection is carried out until the gas lift well is used for normal production;
when the pipe is required to be lifted, the insertion pipe is pulled out, the releasing insertion pipe packer is pulled out, the mandrel uplink baffle is closed, an oil layer channel in the shaft is closed at the moment, and the upper end of the releasing pipe column is in an pressureless state because the oil layer is sealed at the moment, so that the gas lift pipe column can be lifted out quickly at the moment.
Advantageous effects
1. The packer is provided with the top-opening baffle valve at the lower end of the releasing cannula packer, so that the upper wellbore section is not pressurized, the setting of the packer, the releasing tubular column and the lifting of the gas lift production tubular column can be completed by adopting conventional well repairing operation equipment, the use frequency of the ground surface pressurizing device equipment is reduced, a large amount of labor operation cost is saved, and the construction risk and cost of the pressurized operation are avoided.
2. The pipe column related by the invention does not need well killing operation when being started and started in the shale gas well, and the pollution of well killing liquid to a production layer is avoided.
3. The jacketed oil pipe is arranged in the pipe column, so that the production channel of the underground safety valve can be closed timely through the ground when an emergency occurs, the gas-out lifting pipe column is ensured to be lifted under the state of pressure, and the energy loss and the safety accidents are avoided.
4. The pressure limiting rupture plug is internally provided with the bowl-shaped downward ceramic rupture disc, the rupture disc can be broken and the plugging removal and opening thorough full-diameter structure can be realized only by driving a pressure value exceeding the limit of pressure difference bearable on the concave surface of the rupture disc from a wellhead, the problems of frequent casting and fishing operations after the pressure is reduced, the deep casting and fishing operation process under a gas lift working cylinder, the limitation of the inner diameter of a tool and the like can be satisfied, and the problems of high-inclination wells and horizontal wells (more than 35 DEG) are solved.
Drawings
FIG. 1 is a schematic diagram of a gas lift pressurized operation well of the present invention;
FIG. 2 is a schematic diagram of a baffle switch connected to the lower part of a releasing cannula packer at the upper end of an oil layer;
FIG. 3 is an enlarged schematic view of a portion of a packing element of the present invention;
FIG. 4 is a schematic diagram of the structure of the jacketed oil pipe from the downhole safety valve to the wellhead under pressure;
FIG. 5 is an enlarged schematic view of a portion of FIG. 2 at B;
FIG. 6 is an enlarged schematic view of a portion of FIG. 2 at C;
FIG. 7 is a schematic diagram of a device for mounting a nonmetallic pressure limiting fracture plug at the upper end of a gas lift valve;
FIG. 8 is an enlarged schematic view of a portion of FIG. 7 at D;
FIG. 9 is a schematic illustration of a tail plug structure with a plug tail tube with a mandrel and a soluble rupture disc on a cannula according to the present invention;
FIG. 10 is a schematic diagram of a bottom seal testing device with an oil pipe inserted into a working cylinder on a cannula;
FIG. 11 is a schematic view of the closed state structure of the full-path baffle switch of the present invention;
fig. 12 is a schematic view of the open state structure of the full-path baffle switch of the present invention.
In the figure: tubing hanger 1, jacketed tubing 2, capillary 201, ferrule 202, downhole safety valve 3, safety valve baffle 301, pressure limiting rupture plug device 4, upper sub 401, lower sub 402, rupture disc 403, first seal 404, second seal 405, floating ring 406, wave spring 407, gas lift valve 5, tubing 6, pre-set mandrel 7, tail plug 8, soluble rupture plug 801, stinger 9, stinger packer 10, packing element 101, slips 102, full-path baffle switch 11, mandrel 111, baffle 112, screen 12, plugging device 13, tubing bottom seal measurement device 14.
Description of the embodiments
The invention is further explained below with reference to the drawings.
As shown in fig. 1, the gas lift production string with the limited pressure fracture plug device comprises a release insertion pipe packer 10, a full-diameter baffle switch 11 and a screen pipe 12 which are sequentially connected in series, the release insertion pipe packer 10 is connected with the production string in a sliding mode, the production string comprises an oil pipe hanger 1, a jacketed oil pipe 2, a downhole safety valve 3, a plurality of gas lift valves 5, an oil pipe 6, a preset working cylinder 7 and an insertion pipe 9 which are sequentially connected in series, the pressure limit fracture plug device 4 is arranged above each gas lift valve 5, the insertion pipe 9 is connected in the release insertion pipe packer 10 in a sliding mode, a pressure-bearing operation machine device is further arranged above the oil pipe hanger 1, the pressure limit fracture plug device 4 comprises an upper connector 401, the upper connector is connected with the downhole safety valve 3, the lower connector 402 is connected with the lower connector 402 in a threaded mode, and the lower connector 402 is internally provided with a fracture disc 403.
One side of the jacketed oil pipe 2 is also provided with a capillary 201, one end of the capillary 201 is connected with the underground safety valve 3, the other end of the capillary 201 is connected with the oil pipe hanger 1, and the joints of the capillary 201 and the oil pipe hanger 1, the underground safety valve 3 and the jacketed oil pipe 2 are respectively provided with a clamping sleeve 202 for sealing.
The lower side of the rupture disc 403 is also connected with a first sealing ring 404 in a sealing manner on the lower joint 402, a wave spring 407 is further arranged below the upper joint 401, a floating ring 406 is arranged below the wave spring 407, the rupture disc 403 is connected to the lower side of the floating ring 406, a second sealing ring 405 is arranged between the rupture disc 403 and the floating ring 406, and the rupture disc 403 is made of ceramic.
The lower side of the preset working cylinder 7 is connected with a tail plug 8 in a threaded manner, and a soluble fracture plug 801 is arranged in the tail plug 8.
The piston in the tube of the full-diameter baffle switch 11 is connected with a mandrel 111, one end of the mandrel 111 is in contact connection with the insertion tube 9, the other end of the mandrel is in contact with a baffle 112, a torsion spring is further arranged on the baffle 112, the torsion spring is arranged in the tube of the full-diameter baffle switch 11, and the mandrel 111 drives the baffle 112 to open and close.
A method for plugging an oil well comprises the following steps,
as shown in fig. 2 and 11, a blowout preventer and a ground pressure working machine device are installed on a wellhead oil pipe head; under the condition of operation under pressure, a releasing string in which a full-diameter baffle switch 11 of a releasing cannula packer 10 and a screen pipe 12 are connected in series is put into the well bore above an oil layer, after the string is released, a rubber cylinder 101 of the releasing cannula packer 10 is sealed with a slip 102 and anchored at the upper end of the oil layer casing, a baffle 112 of the full-diameter baffle switch 11 is in a closed state, and at the moment, the oil layer is sealed with the casing at the upper end of the packer, so that a tubing string process without killing the well can be realized, the use frequency of the equipment under pressure is reduced, and the operation risk is reduced;
as shown in fig. 1, 2, 11 and 12, after the releasing plugging pipe column is completely released and the oil pipe and the releasing tool are taken out, the gas lift production pipe column is put in, the tail plug 8 and the preset working cylinder 7 are arranged on the tail end insertion pipe 9 of the gas lift production pipe column, after the gas lift valves 5 connected with the limited pressure fracture plug devices 4 are continuously put in, the gas lift valves 5 are arranged between the limited pressure fracture plug devices 4 and the oil pipe 6, then the underground safety valve 3 and the jacket type oil pipe 2 capable of realizing the pressure are put in, after the cutting sleeve and capillary tube links seal the underground safety valve 3 and the oil pipe hanger 1 of each jacket type oil pipe 2 and the oil sealing sleeve annulus of the ground wellhead, the whole gas lift pipe column is put down, the tail end insertion pipe 9 of the pipe column is inserted into the full-diameter baffle switch 11 to push the mandrel 111 to downwards jack the baffle 112, at the moment, a stratum channel is opened, and the gas lift production pipe column is completed;
after the underground safety valve 3 is opened on the ground, pressurizing the underground safety valve from a wellhead to the oil pipe, sequentially blasting the nonmetallic pressure-limiting fracture plug device 4 at the upper end of the pressure-limiting gas lifting valve 5, and blasting the fracture plug in the tail plug 8 at the tail end until the fracture plug penetrates through the production layer;
after the completion of the gas lift production string, annular gas injection is realized until the gas lift well is normally produced;
as shown in fig. 2, a plugging device or an oil pipe bottom sealing and measuring device is put into a pipe before the production layer data are required to be measured or the pipe lifting is operated again, and plugging of the oil pipe in the process of lifting the gas lifting pipe column under pressure can be realized, when the pipe lifting is carried out, the tail end inserting pipe 9 of the gas lifting pipe column is pulled out from the releasing intubation packer 10, the central spindle 111 of the full-diameter baffle switch 11 is closed, at the moment, the oil layer channel in the shaft is closed, and because the oil layer is sealed, the upper end of the packer is in a non-pressure state, and at the moment, the gas lifting pipe column can be quickly lifted; the process reduces the operation load of the ground pressure operation machine and reduces the risks of reverse sealing of the check valve in the gas lift valve 5 and blocking and sealing in the insertion pipe 9;
as shown in fig. 8,9 and 10, a cable capable of sealing an oil separation sleeve annulus and suspending a tubular column is arranged in a wellhead four-way joint and penetrates through an oil pipe hanger 1, a jacketed oil pipe 2, a downhole safety valve 3, a pressure limiting fracture plug device 4, a gas lift valve 5, an oil pipe 6, a preset working cylinder 7, a tail plug 8, an insertion pipe 9, a releasing insertion pipe packer 10, a full-diameter baffle switch 11 and a screen pipe 12; the mandrel 111 of the full-diameter baffle switch 11 is pushed by the rubber cylinder 101, the slips 102 and the pipe column tail end insertion pipe 9 of the releasing cannula packer 10 to downwards jack up the baffle 112 and the screen pipe 12; the cable passes through the tubing hanger 1, the jacketed tubing 2, the downhole safety valve 3, the clamping sleeve 202, the capillary 201 and the safety valve baffle 301; the pressure limiting rupture plug device 4 is composed of an upper joint 401, a lower joint 402, a rupture disc 403, a first sealing ring 404, a second sealing ring 405, a floating ring 406 and a wave spring 407; a dissolvable rupture plug 801, a plugging device 13, or a tubing bottom seal 14.
As shown in fig. 9, the precondition for realizing the gas lift production string under pressure is that an oil layer and a sleeve at the upper end of a packer are sealed and inserted into a pipe 9, a releasing and inserting pipe packer 10, a full-diameter baffle switch 11 and a screen pipe 12; the full-diameter baffle switch 11 is connected under the releasing intubation packer 10 at the upper end of the oil layer, and the full-diameter baffle switch 11 is closed when the insertion pipe 9 is pulled out, and the oil layer is closed at the moment; the pipe column tail end insertion pipe 9 is inserted to push the full-diameter baffle switch 11, the mandrel 111 is pushed down to jack up the baffle 112 to open an oil layer channel, the full-diameter baffle switch 11 adopts a cannula to open the mandrel design, so that erosion of sand-related liquid to a sealing position is effectively avoided, and the service cycle is prolonged; the upper end of the cannula and the lower end of the oil pipe 6 are connected with a soluble fracture plug 801 in a tail plug 8 at the lower end of a preset working cylinder 7, the preset working cylinder 7 and the tail plug 8 are designed into a whole, the soluble fracture plug 801 is arranged in the middle, the soluble fracture plug 801 is pressed and knocked off during well completion, the soluble fracture plug 801 falls to the bottom of the well, a production layer is through, and the soluble fracture plug is dissolved with a medium to be in a powder shape after a few days and can be discharged together with a gas lifting solution; the plugging device 13 for plugging the oil layer or the oil pipe bottom sealing and measuring device 14 can realize the plugging of the pressurized lifting pipe or the logging function in the pipe; the working cylinder 7 is preset, the plugging device 13 is put into the preset working cylinder 7 in the pipe before the production layer data is required to be measured or the pipe lifting column is operated again, the plugging of the oil pipe in the process of lifting the gas lifting column with pressure can be realized, the tail end of the gas lifting production column is inserted into the pipe 9 to be pulled out of the releasing intubation packer 10 when the pipe lifting column is lifted, the core shaft 111 is closed by the ascending baffle 112, the oil layer channel in the shaft is closed at the moment, and the upper end of the releasing intubation packer 10 is in a non-pressure state because the oil layer is sealed at the moment, and the gas lifting column can be quickly lifted at the moment; the process reduces the operation load of the ground pressure operation machine and reduces the risks of reverse sealing of the check valve in the gas lift valve 5 and blocking and sealing in the insertion pipe; and the bottom of the cannula is provided with a preset working cylinder 7, and the plugging device 13 or the oil pipe bottom sealing and measuring device 14 can realize the functions of lifting the pipe under pressure and logging.
As shown in fig. 4,5 and 6, in order to realize that the part from the upper end of the subsurface safety valve 3 to the wellhead is lifted up under pressure, the premise is that a small tubule from the upper end of the subsurface safety valve 3 to the wellhead tubing hanger is put into the tubing to be processed into a jacketed tubing 2, so that the subsurface safety valve 3, the capillary of the jacketed tubing 2 and the wellhead tubing hanger are sealed; the underground safety valve 3 and the jacketed oil pipe 2 which can be pressed down are put into the well, the clamping sleeve 202 and the capillary 201 are linked and sealed, and the underground safety valve 3 and each jacketed oil pipe 2 and a cable of the oil sealing sleeve annulus of the ground wellhead pass through the oil pipe hanger 1 to complete the well; the jacket type oil pipe 2 is formed by pre-burying a capillary into a double-layer oil pipe, hydraulic cylinders are used for lifting and lowering the oil pipe by using pressurized operation equipment, slip teeth are clamped on the outer circle of the jacket type oil pipe 2 to form a sealing and blowout prevention function, and after a safety valve baffle 301 of the underground safety valve 3 is hydraulically controlled to be closed on the ground, the gas lift completion pipe column from the upper end of the underground safety valve 3 to the wellhead part under pressure is realized;
as shown in fig. 7, the precondition for realizing the pressurized lifting of the production string is the packing between the annulus of the gas lift valve and the oil pipe; the upper end of the gas lift valve 5 is provided with a pressure limiting rupture plug device 4, a bowl-shaped downward rupture disc 403 is arranged in an upper joint 401 and a lower joint 402 of the pressure limiting rupture plug device 4, a thorough full-path structure is opened, the pressure limiting rupture plug device is usually arranged at the upper end of the gas lift valve 5 or a water injector and the lower part of a downhole packer or the tail part of a tubing string, and the blowout prevention effect is realized when the well completion string is put down; the floating ring 406 and the wave spring 407 are arranged at the upper part of the first sealing ring 404 and the second sealing ring 405, and the floating structure and the rupture disc 403 determine that the convex surface can bear the pressure of more than 70MPa of the gas seal in the well or the lower part, but can not bear the pressure action of the upper part or the impact force of a pointed object to the concave surface. When the pressure difference from top to bottom of the pressure limiting and breaking plug device 4 reaches or exceeds 7MPa, the pressure limiting and breaking plug device is opened to meet the construction requirement of a gas well, or when the pressure limiting and breaking plug device is impacted by a pointed object to the bottom of a concave surface, the breaking disc 403 is broken or is broken and broken, and then falls into a special impact tool at the bottom of the well after being broken and broken, and the stress is concentrated; the root of the rupture disc 403 is opened in a neat way, and after the rupture disc is opened, the full diameter is realized with a corresponding oil pipe or a matched tool, so that the data and the process of the subsequent steel wire casting and fishing blockage production layer measurement are met, and the gas lift well completion pipe string is put in under the condition of pressurized operation.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (5)
1. The gas lift production pipe column with the pressure limiting fracture plug device is characterized by comprising a releasing pipe plug packer (10), a full-diameter baffle switch (11) and a screen pipe (12) which are sequentially connected in series, wherein the releasing pipe plug packer (10) is connected with the production pipe column in a sliding mode, the production pipe column comprises an oil pipe hanger (1), a jacketed oil pipe (2), a downhole safety valve (3), a plurality of gas lift valves (5), an oil pipe (6), a preset working cylinder (7) and an inserting pipe (9) which are sequentially connected in series, a pressure limiting fracture plug device (4) is arranged above each gas lift valve (5), the inserting pipe (9) is connected in the releasing pipe plug packer (10) in a sliding mode, a pressure-bearing operation machine device is further arranged above the oil pipe hanger (1), the pressure limiting fracture plug device (4) comprises an upper connector (401), the upper connector is connected with the downhole safety valve (3), the lower connector (402) is connected with the lower connector (402) in a threaded mode, and a fracture disc (403) is arranged in the lower connector (402); the lower side of rupture disc (403) still sealing connection has first sealing washer (404) on lower joint (402), the below of upper joint (401) still is equipped with wave spring (407), the below of wave spring (407) is equipped with floating ring (406), connect below of floating ring (406) rupture disc (403), rupture disc (403) with be equipped with second sealing washer (405) between floating ring (406), the material of rupture disc (403) is ceramic.
2. A gas lift production string with a pressure limited frac plug device according to claim 1, wherein a capillary (201) is further provided on one side of the jacketed tubing (2), one end of the capillary (201) being connected to the downhole safety valve (3) and the other end being connected to the tubing hanger (1); the connection parts of the capillary tube (201) and the oil pipe hanger (1), the subsurface safety valve (3) and the jacketed oil pipe (2) are respectively provided with a clamping sleeve (202) for sealing.
3. The gas lift production string with the limited pressure fracture plug device according to claim 1, wherein a tail plug (8) is connected to the lower side of the preset working cylinder (7) in a threaded mode, and a soluble fracture plug (801) is arranged in the tail plug (8).
4. The gas lift production tubular column with the limited pressure breaking plug device according to claim 1, wherein a piston in the tube of the full-diameter baffle switch (11) is connected with a mandrel (111), one end of the mandrel (111) is in contact connection with the insertion tube (9), the other end of the mandrel is in contact with the connection baffle (112), a torsion spring is further arranged on the baffle (112), the torsion spring is arranged in the tube of the full-diameter baffle switch (11), and the mandrel (111) drives the baffle (112) to open and close.
5. A method of performing well plugging operations using a gas lift production string with a pressure limited frac plug device according to any one of claims 1 to 4, wherein: the method comprises the following steps:
1) Installing a blowout preventer and a ground pressurized working machine device on a wellhead oil pipe head; under the condition of pressurized operation, a releasing pipe column which is formed by connecting a releasing pipe plug packer (10), a full-diameter baffle switch (11) and a screen pipe (12) in series is arranged above an oil layer in a well bore, the releasing pipe column seals the releasing pipe plug packer (10) through a rubber sleeve and a slip and anchors the releasing pipe plug packer to the upper end of the oil layer casing, the full-diameter baffle switch (11) and a baffle (112) are in a closed state, and at the moment, the oil layer is sealed with the casing at the upper end of the packer;
2) Taking out the oil pipe and the releasing tool after the releasing pipe column is released, sequentially releasing the inserting pipe (9), loading the oil pipe hanger (1) with the tail plug (8) and the preset working cylinder (7) on the inserting pipe (9), continuously releasing a plurality of gas lift valves (5) connected with the limited pressure fracture plug devices (4), wherein the gas lift valves (5) are arranged between the limited pressure fracture plug devices (4) and the oil pipe (6), then releasing the underground safety valve (3) and the jacket type oil pipe (2) capable of realizing the pressure release, sealing the underground safety valve (3), each jacket type oil pipe (2) and the oil pipe hanger (1) of the oil jacket annulus of the ground wellhead by using the cutting sleeve (202) and the capillary tube (201), integrally releasing the underground safety valve, pushing the mandrel (111) to move downwards to jack up the baffle (112) after the inserting pipe (9) into the full-diameter baffle switch (11), and opening a stratum channel at the moment, and completing the gas lift production pipe column;
3) The underground safety valve (3) is opened on the ground, then the wellhead is used for pressurizing and sequentially blasting the nonmetal pressure limiting fracture plug device (4) at the upper end of the pressure-limiting gas lifting valve (5) and the fracture plug in the tail plug (8) at the tail end of the fracture plug to a through production layer, the tail plug (8) is internally provided with a soluble fracture plug (801), the soluble fracture plug (801) is pressurized and blasted during well completion, the soluble fracture plug (801) falls to the bottom of the well, the production layer is through, and the soluble fracture plug is dissolved into powder with a medium after a plurality of days and is discharged together with a gas lifting solution;
4) After the gas lift production string is completed, annular gas injection is carried out until the gas lift well is used for normal production;
5) When the pipe is required to be lifted, the insertion pipe (9) is pulled out of the large-drift-diameter releasing insertion pipe packer (10), the mandrel uplink baffle of the full-drift-diameter baffle switch (11) is closed, at the moment, an oil layer channel in the shaft is closed, and the upper end of the releasing pipe column is in a non-pressure state because the oil layer is sealed at the moment, so that the gas lift production pipe column can be lifted out rapidly.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105545221A (en) * | 2016-03-04 | 2016-05-04 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | Shale gas well no-killing production tubular column capable of being lifted up and put down under no pressure and construction method |
| CN205605160U (en) * | 2016-05-05 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司 | Formula of breaking tail pipe blanking plug |
| CN109630060A (en) * | 2018-11-05 | 2019-04-16 | 中国石油化工股份有限公司 | A kind of complete well operation tubing string of repeatable no killing well and construction technology |
| CN209724295U (en) * | 2018-12-20 | 2019-12-03 | 中国石油集团川庆钻探工程有限公司 | A kind of one-way fashion underground shut-off valve |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110284242A1 (en) * | 2010-05-19 | 2011-11-24 | Frazier W Lynn | Isolation tool |
| US9593542B2 (en) * | 2013-02-05 | 2017-03-14 | Ncs Multistage Inc. | Casing float tool |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105545221A (en) * | 2016-03-04 | 2016-05-04 | 中国石油化工股份有限公司江汉油田分公司石油工程技术研究院 | Shale gas well no-killing production tubular column capable of being lifted up and put down under no pressure and construction method |
| CN205605160U (en) * | 2016-05-05 | 2016-09-28 | 中国石油集团川庆钻探工程有限公司 | Formula of breaking tail pipe blanking plug |
| CN109630060A (en) * | 2018-11-05 | 2019-04-16 | 中国石油化工股份有限公司 | A kind of complete well operation tubing string of repeatable no killing well and construction technology |
| CN209724295U (en) * | 2018-12-20 | 2019-12-03 | 中国石油集团川庆钻探工程有限公司 | A kind of one-way fashion underground shut-off valve |
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