CN110700779B - Integral water plugging pipe column suitable for plugging shale gas horizontal well - Google Patents
Integral water plugging pipe column suitable for plugging shale gas horizontal well Download PDFInfo
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- CN110700779B CN110700779B CN201911038468.9A CN201911038468A CN110700779B CN 110700779 B CN110700779 B CN 110700779B CN 201911038468 A CN201911038468 A CN 201911038468A CN 110700779 B CN110700779 B CN 110700779B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 27
- 230000000903 blocking effect Effects 0.000 claims abstract description 11
- 238000000926 separation method Methods 0.000 claims abstract description 3
- 210000000078 claw Anatomy 0.000 claims description 21
- 238000003801 milling Methods 0.000 claims description 14
- 238000007789 sealing Methods 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 5
- 238000010168 coupling process Methods 0.000 claims description 5
- 238000005859 coupling reaction Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 claims description 2
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 15
- 238000010276 construction Methods 0.000 abstract description 5
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 238000005553 drilling Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001012 protector Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 241000251468 Actinopterygii Species 0.000 description 1
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000009699 differential effect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/06—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for setting packers
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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
- E21B17/02—Couplings; joints
- E21B17/021—Devices for subsurface connecting or disconnecting by rotation
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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
- E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
- E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1204—Packers; Plugs permanent; drillable
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/129—Packers; Plugs with mechanical slips for hooking into the casing
- E21B33/1291—Packers; Plugs with mechanical slips for hooking into the casing anchor set by wedge or cam in combination with frictional effect, using so-called drag-blocks
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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 an integral water plugging pipe column suitable for plugging a shale gas horizontal well, which comprises an oil pipe, a seat booster, a drillable packer and a soluble plugging core which are sequentially connected from top to bottom, wherein the lowest end of the seat booster is connected with the drillable packer through a setting push cylinder and a soluble centralizing sleeve, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with a central pipe of the seat booster, the lower end of the releasing mechanism is connected with the drillable packer, and when the soluble centralizing sleeve and the soluble plugging core are dissolved, the separation of the seat booster and the packer can be realized through hydraulic releasing. The tubular column has high temperature resistance and pressure resistance, can realize hydraulic setting, setting and blocking and water plugging production by utilizing one-trip tubular column, firstly releases hydraulic pressure when relieving, takes out the small-diameter seat aid, then drills and mills the packer which is relatively short and easy to drill, recovers the original drift diameter of the casing, is safe and reliable to use, and improves the construction efficiency.
Description
Technical Field
The invention relates to a water plugging pipe column for shale gas development, in particular to an integral water plugging pipe column suitable for plugging a shale gas horizontal well.
Background
Aiming at the water outlet of the upper part of the shale gas horizontal well, a tubular column is adopted for water shutoff, namely, an oil pipe is connected with a permanent packer to be clamped and sealed below a water outlet section, and the oil pipe is used as a production channel. But in view of the current relatively low international oil and gas prices, the search for lower cost, efficiency and risk strings is the primary direction of consideration for domestic oil and gas enterprises. The adoption of mechanical setting can not meet the requirement, and the main tubular columns for water plugging of gas production wells at home and abroad at present are as follows: 1. the oil pipe is connected with a seat aid and a permanent packer, the packer is set to a designed depth, the packer is released after hydraulic setting, the pipe column is lifted out, then the pipe column with the insertion pipe is set, the pipe column with the insertion pipe is inserted into the permanent packer to complete the well, and the insertion pipe can be rotated, unscrewed and replaced. 2. The oil pipe is connected with a permanent packer, and after the permanent packer is put in, the permanent packer is directly hydraulically set and clamped, and a ball seat is punched for production. The hydraulic piston of the permanent packer is positioned below a rubber sleeve slip, the upper part of the rubber sleeve is connected with a rotatable tripping insertion pipe, and the insertion pipe can be replaced. These two hydraulic permanent packers are not suited for shale gas horizontal wells: 1. shale gas wells are usually operated under pressure instead of killing, for example, in the first operation mode, the cost of two times of pipe columns without pressing is lower than 30 ten thousand, if the shale gas wells are pressed under pressure, the cost of one time is over 200 thousand, the cost of two times is close to 500 thousand, and for the cost, petroleum enterprises are difficult to satisfy. 2. The second kind is one time to accomplish the tubular column of setting and setting the completion of block, its hydraulic piston is located below the packing element slips, and permanent packer all adopts integral slips, reliable shoulder outburst prevention mechanism, and its setting thrust needs great power, inquiry data, and there is single-stage piston also to have multistage piston mechanism in the existing market, and single-stage piston probably will encroach more internal diameters and improve piston area, nevertheless no matter that kind of mode, and this kind of structure still needs salvage when finally drilling and milling to the piston, and the construction risk is great. It is relatively difficult to salvage objects with irregular fish tops and non-rotation prevention in the horizontal section. In addition, the rotation back-off and disengagement mode adopted by the insertion pipe is not beneficial to releasing in the horizontal section under-pressure operation.
The invention provides a technical scheme of a tubular column capable of safely and reliably blocking water outlet at the upper part of a shale gas horizontal well. The pipe column has high temperature resistance and pressure resistance, can realize hydraulic setting, blocking and water plugging production by utilizing the pipe column once, firstly releases hydraulic pressure when releasing, takes out the small-diameter seat assisting device, then drills and mills the packer which is relatively short and easy to drill, and recovers the original drift diameter of the casing pipe.
Disclosure of Invention
The technical problem to be solved by the invention is to provide an integral water plugging tubular column suitable for plugging a shale gas horizontal well, which can realize hydraulic setting, setting and blocking production by utilizing a tubular column once, firstly release hydraulic pressure when releasing, take out a small-diameter seat aid, then drill and mill a relatively short and easily drilled packer, recover the original drift diameter of a casing pipe, and greatly improve the construction efficiency.
The technical scheme adopted by the invention is as follows: the utility model provides an integral water shutoff tubular column of adaptation shale gas horizontal well shutoff, its includes from last oil pipe, the seat ware of helping, the packer that can bore and soluble core that blocks up that connects gradually down, its characterized in that: the packer-aid device is boosted by a plurality of stages of hydraulic pistons, each stage of hydraulic piston comprises a central pipe and a piston sleeve, the lowest end of the packer-aid device is connected with a drillable packer through a setting push cylinder and a soluble centralizing sleeve, hydraulic pressure enters a corresponding piston cavity through a pressure transmission hole in the central pipe, a lower-level piston structure and the setting push cylinder are pushed under the action force of set pressure difference, so that the drillable packer is set, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with the central pipe of the packer-aid device, the lower end of the releasing mechanism is connected with the drillable packer, and after the soluble centralizing sleeve and the soluble plugging core are dissolved, the separation of the packer-aid device and the packer can be realized through the hydraulic releasing mechanism.
According to the technical scheme, the outer diameter of the insoluble part of the seat aid is smaller than the outer diameter of the drillable packer and larger than the outer diameter of the tubing coupling, so that the soluble centralizer can be conveniently pulled out after being released, the outer diameter of the soluble centralizer is larger than the outer diameter of the drillable packer, the soluble centralizer plays a role in centralization and impact resistance in the process of going down a well, the packer is prevented from being set in advance, and normal water plugging production can be automatically dissolved within a period of time.
According to the technical scheme, the releasing mechanism comprises a releasing central pipe, a supporting sleeve connected with the lower end of the releasing central pipe through a releasing pin, a setting push cylinder sleeved outside the releasing central pipe, and a claw-type locking finger arranged between the supporting sleeve and the setting push cylinder, wherein the lower end of the claw-type locking finger is connected with an internal thread sleeve, a claw of the claw-type locking finger is hermetically pressed in a locking groove at the upper end of the internal thread sleeve through the supporting sleeve, the internal thread sleeve is fixedly connected with the drillable packer, a radial pressure relief channel is arranged on the supporting sleeve, when the supporting sleeve goes down, a side pressure relief channel is formed between the supporting sleeve and the claw-type locking finger, pressure relief is carried out through the side pressure relief channel and the radial pressure relief channel, and the lower end of the setting push cylinder is connected with the drillable packer through a soluble centering sleeve.
According to the technical scheme, the inverted cone-shaped sealing surface is arranged inside the upper end of the support sleeve, and the lower end of the support sleeve extends into the center tube of the drillable packer and can slide relative to the center tube.
According to the technical scheme, the claw type lock finger comprises an upper section, a terminal and a lower section, the upper end is in sealed configuration with the central tube, the middle section and the lower end form a plurality of lock fingers which are circumferentially arranged, the lower end is connected with the internal thread sleeve through right-handed threads, an inner groove with the gradually increased inner diameter is arranged in the middle section, the inner groove is located below the releasing pin, and when the supporting sleeve falls into the inner groove downwards, the supporting sleeve can be hung.
According to the technical scheme, an annular gap is arranged between the internal thread sleeve and the supporting sleeve, and the upper end of the internal thread sleeve is provided with a locking groove which is connected with a locking finger on the claw type locking finger in a sealing manner.
According to the technical scheme, the outer wall of the upper end of the supporting sleeve is provided with a flange, the flange is in sealing connection with the claw-type lock finger, and the radial pressure relief channel comprises an upper pressure relief opening arranged below the flange and a lower pressure relief opening arranged below the supporting sleeve.
According to the technical scheme, the upper pressure relief port is a support sleeve milling groove, and the lower pressure relief port is a support sleeve slotting.
According to the technical scheme, the drillable packer comprises a central lock tooth pipe, wherein an upper lock tooth sleeve, an upper slip component, a rubber cylinder, a shoulder protecting component and a lower slip component are sequentially arranged outside the central lock tooth pipe, the upper lock tooth sleeve is matched with a ratchet wheel lock ring, an internal thread sleeve is connected with the central lock tooth pipe, and a soluble blocking core is hermetically connected with the lower end part of the central lock tooth pipe.
According to the technical scheme, the internal thread sleeve is connected and sealed with the conical thread of the central lock gear pipe, and the upper lock gear sleeve is fixed with the milling groove pin of the internal thread sleeve.
The beneficial effects obtained by the invention are as follows:
1. the tubular column has high temperature resistance and pressure resistance, can realize hydraulic setting, setting and blocking and water plugging production by utilizing the tubular column once, firstly releases hydraulic pressure when relieving, takes out the small-diameter seat aid, then drills and mills the packer which is relatively short and easy to drill, recovers the original drift diameter of the casing, is safe and reliable to use, and greatly improves the construction efficiency.
2. The claw type lock finger of the releasing mechanism adopts claw type conical right screw to be mutually embedded and connected with the internal thread sleeve, the non-releasing state is maintained under the support of the support sleeve, the threaded connection type mutual embedding surface is large, the depth is shallow, the releasing is reliable, and the connection strength is high.
3. The slotting type pressure relief channel is adopted, so that production gas carrying sand grains are effectively prevented from entering the releasing mechanism, and the releasing reliability is improved.
Drawings
Fig. 1 is a structural diagram of an integral water shutoff pipe column of the invention.
FIG. 2 is a block diagram of the invention showing the integral configuration of a landing aid and drillable packer (two separate blocks).
Fig. 3 is a schematic view of a pressure relief channel of the release mechanism of the present invention.
Fig. 4 is a schematic view of a groove milling structure of the support sleeve of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1-4, the present embodiment provides an integral water plugging string suitable for plugging shale gas horizontal wells, which comprises an oil pipe, a mandrel 1, a seat aid 2, a releasing mechanism 3, a drillable packer 4 and a soluble plugging core 28, which are connected in sequence from top to bottom.
The seat aid is a multi-stage piston mechanism, each stage of piston mechanism comprises a central pipe 6 and a piston sleeve 5 which are sequentially connected inside and outside, and the lower end of the multi-stage piston is sequentially connected with a setting push cylinder 8 and a soluble centralizing sleeve14. The seat aid that this embodiment provided is level four piston mechanism, and hydraulic pressure passes the pressure hole by on the center tube and gets into the piston chamber that corresponds, under the effort of setting for the pressure differential effect, promotes subordinate's piston structure and sits and seal the pusher, and then realizes drillable packer and sits and seal. The seat aid device is used as a production channel after completing the seat aid function in production. The setting pusher 8 is an adjustable connection gap between the drillable packer 4 and the setting aid 2. The external diameter of the insoluble part of the seat aid is less than that of the drillable packer and is more than 27/8The outer diameter of the UP TBG tubing coupling is larger than that of a drillable packer, and the soluble centralizer sleeve can be dissolved within a period of time after setting, so that the raising safety is good.
The releasing mechanism comprises a releasing central tube 7, a supporting sleeve 12 connected with the lower end of the releasing central tube 7 through a releasing pin 10, a setting push cylinder 8 sleeved outside the releasing central tube, and a claw type locking finger 11 arranged between the supporting sleeve 12 and the setting push cylinder 8, wherein the releasing central tube 7 is connected with the lower end of a four-stage piston central tube, the claw type locking finger 11 is mutually embedded and connected with an internal thread sleeve 13 through a claw type conical right screw, a claw of the claw type locking finger 11 is sealed and pressed in a locking groove at the upper end of the internal thread sleeve through the supporting sleeve 12, and a non-releasing state is maintained under the supporting of the supporting sleeve 12. The internal thread sleeve 13 is fixedly connected with an upper lock tooth sleeve 15 of the drillable packer, a radial pressure relief channel is arranged on the support sleeve 12, when the support sleeve goes down, a side pressure relief channel is formed between the support sleeve 12 and the claw-type lock finger, and pressure relief is carried out through the side pressure relief channel and the radial pressure relief channel. The lower end of the setting pusher 8 is connected with a drillable packer by a soluble centralizing sleeve 14. As shown in fig. 3, the claw lock finger 11 is engaged with the female screw sleeve 13 by a claw-type tapered right-hand screw, and is held in a non-releasing state by the support of the support sleeve 12. And (3) putting the steel ball 9 at the later stage, pushing the support sleeve 12 to descend hydraulically, enabling the seal ring of the support sleeve to leave the seal surface and enter the large-diameter concave space 30, losing the seal, and releasing the pressure from the support sleeve slit 31 through the support sleeve milling groove 29. The support sleeve is finally hung by the step in the claw-type lock finger 11, and can be carried and taken out when the releasing is separated.
In this embodiment, an inverted conical sealing surface is arranged inside the upper end of the support sleeve 12, and the lower end of the support sleeve extends into the central latch pipe 23 of the drillable packer and can slide relative to the central latch pipe.
In this embodiment, the claw-type locking finger 11 includes an upper section, a terminal, and a lower section, the upper end is configured to seal with the central tube 7, the middle section and the lower end form a plurality of circumferentially arranged locking fingers, the lower end is connected to the internal thread sleeve through a right-handed thread, an inner groove 30 with gradually increasing inner diameter is provided in the middle section, the inner groove is located below the releasing pin 10, and when the supporting sleeve 12 descends into the inner groove, the supporting sleeve 12 can be hung.
An annular gap is arranged between the internal thread sleeve 13 and the support sleeve 12, and the upper end of the internal thread sleeve is provided with a lock groove which is connected with a lock finger on the claw type lock finger in a sealing way.
The outer wall of the upper end of the support sleeve 12 is provided with a flange, the flange is in sealing connection with the claw-type lock finger, and the radial pressure relief channel comprises an upper pressure relief opening arranged below the flange and a lower pressure relief opening arranged below the support sleeve. Specifically, the upper pressure relief opening is a support sleeve milling groove 29, and the lower pressure relief opening is a support sleeve cutting groove 31. The support sleeve slot 31 adopts a slot with the diameter less than or equal to 0.5mm, which is a pressure relief channel on one hand and is used for preventing sand grains from entering the releasing mechanism on the other hand.
The soluble centralizing sleeve 14 in this embodiment has an outer diameter greater than the packer. The packer has the functions of centralizing and impact resistance in the process of descending into the well, prevents the packer from descending into the well and setting in advance, and prevents the packer from dissolving automatically in normal water plugging production for a period of time.
The drillable packer is processed by high-strength nodular cast iron and aluminum alloy. The drillable packer comprises a central latch tooth pipe 23, an upper latch tooth sleeve 15, an upper slip component (comprising an upper slip 17 and an upper cone 18), a rubber cylinder and shoulder pad component (a middle rubber cylinder 22 and end rubber cylinders 21 at two sides of the middle rubber cylinder, a deformable soft metal shoulder pad 20, a split shoulder pad 19) and a lower slip component (comprising a lower slip and a lower cone 24) are sequentially arranged outside the central latch tooth pipe 23, the upper latch tooth sleeve 15 is matched with a ratchet locking ring 16, and an internal thread sleeve 13 is in tapered threaded connection and sealing with the central latch tooth pipe 23. The slip and the cone are combined by adopting a six-equal-divided inclined plane, the root part of the slip is mutually embedded with the upper lock gear sleeve 15 and the lower joint 26, a ratchet wheel lock ring is arranged in the upper lock gear sleeve of the drillable packer for locking, and meanwhile, the lower cone 24 is also internally provided with anti-rotation locking, so that the packer has better anti-rotation drillable performance. Wherein the upper lock tooth sleeve 15 is fixed with the internal thread sleeve milling groove pin. The soluble plugging core is hermetically connected with the lower end part of the central latch pipe, fixed by a setting shear pin 27 and connected with a lower joint 26, and an anti-rotation lock ring 25 is installed in the lower cone 24. The internal thread sleeve 13 is connected and sealed with the central latch tooth pipe 23 by taper thread. The upper lock gear sleeve 15 is fixed with the milling groove pin of the internal thread sleeve. The soluble occlusive wick 28 dissolves itself over a period of time after being knocked off.
During construction, the pipe column is sealed through the soluble plugging core 28, the designed depth is set under pressure operation, the oil pipe is hydraulically set, the drillable packer 4 is clamped, a water outlet layer and a gas production layer are separated, the soluble plugging core 28 is knocked off by continuously increasing the pressure, the soluble plugging core is dissolved automatically after production for a period of time, and meanwhile, the soluble centering sleeve on the seat assisting device is also dissolved automatically. The produced gas is produced through the drillable packer 4, the seat aid 2 and the oil pipe. When needing to be relieved in the later period, a phi 50.8mm steel ball 9 is thrown in and falls into the releasing mechanism 3, the minimum inner diameter of 2 working cylinders is 58mm, the inner diameter of the seat aid is 60mm, and the minimum inner diameter of the releasing mechanism is 50 mm. The outer diameter of the hydraulic releasing and seating aid is 96mm and is slightly larger than 27/8The UP TBG tubing coupling is 93mm, and the pull-out safety is good.
The method specifically comprises the following steps: the tubular column is lowered to the designed depth, under the sealing condition of the soluble blocking core 28, hydraulic pressure is transmitted from a four-stage central tube pressure transmitting hole to enter a four-stage piston cavity, under the strong acting force of the pressure difference, the setting push cylinder 8, the soluble centralizing sleeve 14, the upper locking tooth sleeve 15, the ratchet locking ring 16, the slip 17, the upper cone 18, the split shoulder protector 19 and the like are pushed, the rubber cylinder is compressed, the shoulder protector system is expanded and protected, the ratchet locking ring 16 and the anti-rotation locking ring 25 are locked in a one-way motion mode, after the designed pressure is reached, the pressure is continuously increased to knock off the soluble blocking core 28, and the setting and the blocking can be completed. The soluble plugging core 28 dissolves itself over a period of time and the drillable packer and booster internal channel is the production channel. The soluble centralizing sleeve 14 to which the setting pusher 8 is tightly attached also dissolves itself over a subsequent period of time.
When the pipe column clamping state needs to be relieved, a phi 50.8mm steel ball 9 is thrown in, falls into a sealing inclined plane with the minimum inner diameter of 50mm of the releasing mechanism, the hydraulic pressure drops suddenly until the pressure drops suddenly, the hydraulic pressure pushes the support sleeve 12 to descend, and the seal ring of the support sleeve is separated from the seal ringThe open sealing surface enters the large-diameter concave space 30, the sealing is lost, and the pressure is relieved from the support sleeve slit 31 through the lateral pressure relief channel (the annular gap between the support sleeve and the concave space 30) and the support sleeve milling groove 29. See figure 3 release mechanism pressure relief channel and support sleeve mill grooves. At this time, the claw lock finger 11 and the internal thread sleeve 13 are separated from each other due to the loss of support, and the support sleeve is hung by the step in the claw lock finger 11 and can be carried and taken out. Since the soluble centralizing sleeve is dissolved, the maximum external diameter of the seat aid is only 96mm and is slightly more than 27/8The UP TBG tubing coupling has the outer diameter of 93mm and has better pulling-out safety.
When drilling and milling, because prevent changeing the slips down of catch 25 fastening, keep the structure when drilling and milling and prevent changeing, when drilling and milling to preventing changeing catch 25 department, surplus and not hard up throw off, can adopt the formula of can backing off to drag for lance or strong magnetism to salvage, perhaps adopt to push to the artificial shaft bottom, because the lower clutch sets up two closed angles, but the artificial shaft bottom of anchoring prevents to rotate, is convenient for continue to bore and mill.
Claims (8)
1. The utility model provides an integral water shutoff tubular column of adaptation shale gas horizontal well shutoff, its includes from last oil pipe, the seat ware of helping, the packer that can bore and soluble core that blocks up that connects gradually down, its characterized in that: the seat assisting device is assisted by a multi-stage hydraulic piston structure, each stage of hydraulic piston structure comprises a central pipe and a piston sleeve, the bottommost end of the seat aid is connected with the drillable packer through a setting push cylinder and a soluble centralizing sleeve, hydraulic pressure enters a corresponding piston cavity through a pressure transfer hole on a central pipe, under the action of the set pressure difference, the lower-level hydraulic piston structure and the setting push cylinder are pushed, so that the setting of the drillable packer is realized, a releasing mechanism is arranged in a cylindrical structure formed by the setting push cylinder and the soluble centralizing sleeve, the upper end of the releasing mechanism is connected with a central pipe of the seat aid, the lower end of the releasing mechanism is connected with the drillable packer, after the soluble centralizing sleeve and the soluble blocking core are dissolved, the separation of the seat aid and the packer can be realized through hydraulic release, the outer diameter of the insoluble part of the seat aid is smaller than the outer diameter of the drillable packer and larger than the outer diameter of the tubing coupling, and the outer diameter of the soluble centralizing sleeve is larger than the outer diameter of the drillable packer;
the releasing mechanism comprises a releasing central pipe, a supporting sleeve connected with the lower end of the releasing central pipe through a releasing pin, a setting push cylinder sleeved outside the releasing central pipe, and a claw-type locking finger arranged between the supporting sleeve and the setting push cylinder, wherein the lower end of the claw-type locking finger is connected with an internal thread sleeve, a claw of the claw-type locking finger is hermetically pressed in a locking groove at the upper end of the internal thread sleeve through the supporting sleeve, the internal thread sleeve is fixedly connected with the drillable packer, a radial pressure relief channel is arranged on the supporting sleeve, when the supporting sleeve goes down, a side pressure relief channel is formed between the supporting sleeve and the claw-type locking finger, pressure relief is carried out through the side pressure relief channel and the radial pressure relief channel, and the lower end of the setting push cylinder is connected with the drillable packer through a soluble centering sleeve.
2. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 1, wherein: the inside sealed face of back taper that is equipped with of the upper end of supporting the cover, the lower extreme stretches into in the center tube that can bore the packer to can slide rather than it.
3. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 1, wherein: the claw type lock finger comprises an upper section, a terminal and a lower section, the upper end of the claw type lock finger is in sealed configuration with the central tube, the middle section and the lower end of the claw type lock finger form a plurality of lock fingers which are circumferentially arranged, the lower end of the claw type lock finger is connected with the internal thread sleeve through right-handed threads, an inner groove with the inner diameter gradually increased is arranged in the middle section of the claw type lock finger, the inner groove is located below the releasing pin, and when the supporting sleeve falls into the inner groove downwards, the supporting sleeve can be hung.
4. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 2, wherein: an annular gap is arranged between the internal thread sleeve and the supporting sleeve, and the upper end of the internal thread sleeve is provided with a locking groove which is connected with a locking finger on the claw type locking finger in a sealing way.
5. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 1, wherein: the outer wall of the upper end of the support sleeve is provided with a flange, the flange is in sealing connection with the claw-type lock finger, and the radial pressure relief channel comprises an upper pressure relief opening arranged below the flange and a lower pressure relief opening arranged below the support sleeve.
6. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 5, wherein: the upper pressure relief port is a support sleeve milling groove, and the lower pressure relief port is a support sleeve cutting groove.
7. The integral water plugging tubular column adapted for plugging shale gas horizontal wells according to claim 1, wherein: the drillable packer comprises a central lock tooth pipe, wherein an upper lock tooth sleeve, an upper slip component, a rubber cylinder, a shoulder guard component and a lower slip component are sequentially arranged outside the central lock tooth pipe, the upper lock tooth sleeve is matched with a ratchet wheel lock ring, an internal thread sleeve is connected with the central lock tooth pipe, and a soluble blocking core is hermetically connected with the lower end part of the central lock tooth pipe.
8. The integral water shutoff tubular column adapted for plugging shale gas horizontal wells according to claim 6, wherein: the internal thread sleeve is connected and sealed with the conical thread of the central lock gear pipe, and the upper lock gear sleeve is fixed with the milling groove pin of the internal thread sleeve.
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| CN201911038468.9A CN110700779B (en) | 2019-10-29 | 2019-10-29 | Integral water plugging pipe column suitable for plugging shale gas horizontal well |
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| CN201911038468.9A CN110700779B (en) | 2019-10-29 | 2019-10-29 | Integral water plugging pipe column suitable for plugging shale gas horizontal well |
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| CN111502594B (en) * | 2020-04-28 | 2024-05-10 | 大庆兴华天义石油钻采设备制造有限公司 | Double-tube separate injection tool capable of drilling bridge plug |
| CN113914813A (en) * | 2021-09-28 | 2022-01-11 | 四川省威沃敦化工有限公司 | Small-diameter water plugging tool |
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