CN110725660B - Multistage releasable water-swelling packer and method - Google Patents
Multistage releasable water-swelling packer and method Download PDFInfo
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- CN110725660B CN110725660B CN201910925540.3A CN201910925540A CN110725660B CN 110725660 B CN110725660 B CN 110725660B CN 201910925540 A CN201910925540 A CN 201910925540A CN 110725660 B CN110725660 B CN 110725660B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 230000000903 blocking effect Effects 0.000 claims description 18
- 239000011347 resin Substances 0.000 claims description 18
- 229920005989 resin Polymers 0.000 claims description 18
- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000002250 absorbent Substances 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- 210000001624 hip Anatomy 0.000 claims description 11
- 230000000694 effects Effects 0.000 claims description 7
- 238000012856 packing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- 238000003801 milling Methods 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 abstract description 2
- 230000008961 swelling Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 235000019198 oils Nutrition 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 230000001066 destructive effect Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002535 acidifier Substances 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000019476 oil-water mixture Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/122—Multiple string packers
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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)
- Revetment (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Gasket Seals (AREA)
Abstract
The invention relates to a multi-stage releasable water-swelling packer and a method. The technical scheme is as follows: the water-swelling rubber is processed on the outer sides of the three sections of central tubes and the two groups of sealing devices, a first group of sealing devices are arranged between the first section of central tube and the second section of central tube, and a second group of sealing devices are arranged between the second section of central tube and the third section of central tube; and the outer walls of the first section of central pipe, the second section of central pipe, the third section of central pipe, the first group of unsealing devices and the second group of unsealing devices are processed with water-swellable rubber. The beneficial effects are that: according to the invention, by designing the multi-stage deblocking structure, the shrinkage of longer water-swellable rubber can be realized, deblocking can be realized, the condition that the water-swellable rubber cannot be pulled due to large resistance in well repair can be avoided, and the drawing by forcibly increasing the tensile force is also avoided; the problems of high cost and long operation period caused by the milling operation through the milling shoe are also avoided.
Description
Technical Field
The invention relates to a petroleum underground operation tool and a method, in particular to a multistage releasable water-swelling packer and a method.
Background
The packer is a special tool for underground layered packing composed of steel body, packing part and control part, and is used in petroleum industry for meeting the requirements of oil-water well for certain technological purpose or oil layer technological measure. The packer comprises a self-sealing type, an expanding type, a compression type and a combined type structure, the application fields of the packer are different, when an open hole well and an oil well with a damaged sleeve are met, the four packers cannot achieve a sealing effect through mechanical seat sealing or hydraulic seat sealing, and the water-swelling packer developed in recent years can be adopted. At present, the existing water swelling packer is generally used for multiple layers and layers which cannot be hydraulically or mechanically set, and can be smoothly put into a well to realize water swelling.
For example, the chinese patent publication No. 202832366U, entitled "packer expandable in water when encountering oil", includes two tubing couplings respectively disposed at two ends of the packer, and the outer ends of the two tubing couplings are respectively connected to a tail pipe or a screen pipe; the two ends of the packer base body are respectively connected with the inner side ends of the two tubing couplings; one end of each limiting seat is fixed between the tubing coupling and the packer base body, and the other end of each limiting seat is provided with an embedded groove along the extension direction of the packer base body; and the two ends of the oil-water self-expansion rubber are respectively embedded into the oppositely arranged embedded grooves and fixed outside the packer matrix. Effectively prevent to meet the condition that oil meets water self-expanding formula rubber friction damage and tip outwards turned, strengthen sealed effect. It has the problems that: because there is always an oil-water mixture downhole, the packer is always inflated. When the well is repaired, the whole tubular column needs to be taken out, and the original water-swelling packer is always in a swelling state, so that the existing water-swelling packer has large resistance and cannot be pulled; if the pulling force is increased forcibly for drawing, the destructive force on the stratum is too large due to the pumping action of the packer, and even the original formed curing structure of the cross-linking agent, curing agent, acidifying agent, sand and the like injected into the stratum before is destroyed, thereby causing the waste well of the oil well seriously; another method is to mill the packer by means of a milling shoe, which has the problem of high cost, long cycle time and the tendency to damage the well wall or casing.
In addition, the length of the water-swelling rubber adopted by the existing water-swelling packer is generally short, and sometimes complete sealing cannot be realized; after the water-swellable rubber is lengthened, because the existing technology can not realize deblocking, the well repairing operation time is longer, and the possibility of wearing the well wall or the casing is higher, the packer with the lengthened water-swellable rubber is rarely adopted in actual production.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a multi-stage releasable water-swelling packer and a method thereof, which can solve the problem of shrinkage of water-swelling rubber and realize release, can also enhance the sealing property of the water-swelling rubber and ensure the packing effect.
The invention provides a multistage releasable water swelling packer, which adopts the technical scheme that: the water-swelling rubber is processed on the outer sides of the three sections of central tubes and the two groups of sealing devices, a first group of sealing devices (a) is arranged between the first section of central tube and the second section of central tube, and a second group of sealing devices (b) is arranged between the second section of central tube and the third section of central tube; wherein each group of deblocking devices comprises a first retaining ring (3), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a second retaining ring (7),
the middle part of the deblocking lining pipe (4) is fixed with a first section of central pipe (9) through a first deblocking shear pin (5), a second section of central pipe (10) is fixed through a second deblocking shear pin (6), a first baffle ring (3) is fixed on the outer wall of the middle part of the first section of central pipe (9), the upper end of the first section of central pipe (9) is provided with an upper joint (1), the outer wall of the middle part of the second section of central pipe (10) is fixed with a second baffle ring (7), the outer wall of a third section of central pipe (18) is provided with a third baffle ring (19), and the lower end of the third section of central pipe (18) is provided with a lower joint (8);
and the outer walls of the first section of central tube (9), the second section of central tube (10), the third section of central tube (18), the first group of unsealing devices (a) and the second group of unsealing devices (b) are processed with water-swellable rubber (2).
Preferably, the lower extreme of foretell first section center tube (9) is equipped with first deblocking and keeps off ring (12), the both ends inboard of deblocking bushing pipe (4) be equipped with first convex shoulder (11) and second convex shoulder (14) respectively, the upper end of second section center tube (10) is equipped with second deblocking and keeps off ring (13), first convex shoulder (11) and second convex shoulder (14) of deblocking bushing pipe (4) keep off ring (12) and the second deblocking of second section center tube (10) and keep off ring (13) cooperation with the first deblocking of first section center tube (9) respectively.
Preferably, the inner edge of the first shoulder (11) is provided with a convex inner steel ring (16) for being firmly matched with the first deblocking ring (12), and the inner edge of the second shoulder (14) is provided with a convex inner steel ring (16) for being firmly matched with the second deblocking ring (13).
Preferably, the outer edges of the first deblocking ring (12) and the second deblocking ring (13) are respectively provided with a convex outer steel ring (15).
Preferably, the first baffle ring (3) and the second baffle ring (7) have isosceles trapezoid cross sections, the lower bottom of the first baffle ring (3) is fixedly connected with the outer wall of the first section of central tube (9), the lower bottom of the second baffle ring (7) is fixedly connected with the outer wall of the second section of central tube (10), and the inner cavities of the first baffle ring (3) and the second baffle ring (7) are hollow structures.
Preferably, the two waists of the first retaining ring (3) and the second retaining ring (7) are provided with communicating holes (7.1), the inner cavities of the first retaining ring (3) and the second retaining ring (7) are filled with water-absorbent resin, the water-absorbent resin is communicated with the water-swellable rubber (2), and the bulge (17) is formed after the water-swellable rubber is swelled.
Preferably, the length of the deblocking lining (4) is less than one third of the expansion length between the first retaining ring (3) and the second retaining ring (7).
The invention provides a using method of a multi-stage releasable water-swelling packer, which comprises the following steps:
firstly, assembling a multi-stage releasable water-swelling packer, which comprises three sections of central pipes, one group of water-swelling rubber and two groups of deblocking devices, wherein the water-swelling rubber is processed on the outer sides of the three sections of central pipes and the two groups of deblocking devices, a first group of deblocking devices (a) is arranged between the first section of central pipe and the second section of central pipe, and a second group of deblocking devices (b) is arranged between the second section of central pipe and the third section of central pipe; each group of deblocking devices comprises a first retaining ring (3), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a second retaining ring (7);
the middle part of the deblocking lining pipe (4) is fixed with a first section of central pipe (9) through a first deblocking shear pin (5), a second section of central pipe (10) is fixed through a second deblocking shear pin (6), a first baffle ring (3) is fixed on the outer wall of the middle part of the first section of central pipe (9), an upper joint (1) is arranged at the outer end of the first section of central pipe (9), a second baffle ring (7) is fixed on the outer wall of the middle part of the second section of central pipe (10), a third baffle ring (19) is arranged on the outer wall of the third section of central pipe (18), and a lower joint (8) is arranged at the outer end of the third section of central pipe (18);
the outer walls of the first section of central tube (9), the second section of central tube (10), the third section of central tube (18), the first group of unsealing devices (a) and the second group of unsealing devices (b) are processed with water-swellable rubber (2);
secondly, the device is put into a preset position to be sealed in a barefoot well or a sleeve, the water-swellable rubber (2) begins to swell when meeting water, and the first, second and third baffle rings are filled with water-absorbent resin due to the fact that the interior of the first, second and third baffle rings is filled with the water-absorbent resin, and communication holes are formed in the two waist portions respectively, the water-swellable rubber (2) is driven to further swell when meeting water by the water-absorbent resin, so that bulge bulges (17) are formed, and the sealing effect on the well wall is further enhanced;
thirdly, when the well is repaired and is unsealed, the first section of the central pipe (9) is lifted, the first section of the central pipe (9) moves upwards and cuts the first unsealing shear pin, the first section of the central pipe (9) continues to move upwards, when the first unsealing stop ring (12) moves upwards to the first shoulder (11) of the unsealing liner pipe (4), the first section of the central pipe (9) drives the unsealing liner pipe (4) to move upwards, the second unsealing shear pin (6) is cut simultaneously, the unsealing liner pipe (4) continues to move upwards, and when the second shoulder (14) contacts the second unsealing stop ring (13), the unsealing liner pipe (4) stops moving upwards; at the moment, a deblocking distance is kept between the first section of central pipe (9) and the second section of central pipe (10), the water-swelling rubber (2) is pulled apart by the length of the deblocking distance, the thickness of the water-swelling rubber (2) is narrowed, the pressure of bulge (17) is released, the packer is moved upwards, after the packer is continuously lifted upwards, the second section of central pipe (9) drives the third section of central pipe (18) to realize deblocking and lifting, the second section of packer is moved upwards, and finally the overall lifting of the multi-stage deblocking type water-swelling packer is realized.
The invention has the beneficial effects that: the multi-stage deblocking structure is designed, so that the shrinkage of the water-swellable rubber can be realized, deblocking can be realized, the situation that the water-swellable rubber cannot be pulled due to high resistance in well repair can be avoided, the situation that pulling force is increased forcibly for pulling can also be avoided, and huge destructive force is generated on a stratum due to the pumping action of the packer; the problems of high cost and long operation period caused by the milling operation through the milling shoe are also avoided;
according to the invention, the plurality of baffle rings are arranged, and the cavity is filled with the water-absorbent resin, so that when water is absorbed and expanded, the water-swellable rubber is extruded along the two waist directions to form the bulge, thereby enhancing the sealing property of the water-swellable rubber and avoiding the problem of poor sealing caused by uneven expansion;
the deblocking liner tube is matched with the shearing pin, and the deblocking liner tube is connected with each section of central tube to drive the water-swelling rubber to narrow, so that the acting force between the packer and the well wall is greatly reduced, the pumping action in the lifting process is eliminated, and the damage to the solidification structure of the stratum is avoided;
furthermore, the length design of deblocking bushing pipe has certain requirement, and the length of deblocking distance is less than the third that expands length between first fender ring and the second fender ring specifically says so, avoids meeting the condition that water inflation rubber was broken by the stretch, and each fender ring also plays the additional action moreover to guaranteed that the packer wholly lifts the completion.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a first step of deblocking according to the present invention;
FIG. 3 is a schematic diagram of the fully deployed configuration of the present invention when unsealed;
FIG. 4 is an enlarged schematic view of the first embodiment at the release liner and shear pin;
FIG. 5 is an enlarged schematic view of a second embodiment of the release liner and shear pin;
FIG. 6 is an enlarged view of the retainer ring prior to expansion;
FIG. 7 is an enlarged view of the retainer ring after expansion;
FIG. 8 is an enlarged view of the retainer ring in an alternate configuration prior to expansion;
in the upper diagram: the water-swellable rubber pipe comprises an upper connector 1, water-swellable rubber 2, a first blocking ring 3, a deblocking liner pipe 4, a first deblocking shear pin 5, a second deblocking shear pin 6, a second blocking ring 7, a lower connector 8, a first section of central pipe 9, a second section of central pipe 10, a first shoulder 11, a first deblocking blocking ring 12, a second deblocking blocking ring 13, a second shoulder 14, an outer steel ring 15, an inner steel ring 16, a bulge 17 and a third section of central pipe 18; a first set of unsealing means (a), a second set of unsealing means (b), and a communication hole 7.1.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Embodiment 1, referring to fig. 1 and 4, the invention provides a multi-stage releasable water-swellable packer, which adopts the following technical scheme: the water-swelling rubber is processed on the outer sides of the three sections of central tubes and the two groups of sealing devices, a first group of sealing devices a are arranged between the first section of central tube and the second section of central tube, and a second group of sealing devices b are arranged between the second section of central tube and the third section of central tube; wherein each group of deblocking devices comprises a first retaining ring 3, a deblocking liner pipe 4, a first deblocking shear pin 5, a second deblocking shear pin 6 and a second retaining ring 7,
the middle part of the deblocking lining pipe 4 is fixed with a first section of central pipe 9 through a first deblocking shear pin 5, a second section of central pipe 10 is fixed through a second deblocking shear pin 6, a first baffle ring 3 is fixed on the outer wall of the middle part of the first section of central pipe 9, an upper joint 1 is arranged at the upper end of the first section of central pipe 9, a second baffle ring 7 is fixed on the outer wall of the middle part of the second section of central pipe 10, a third baffle ring 19 is arranged on the outer wall of a third section of central pipe 18, and a lower joint 8 is arranged at the lower end of the third section of central pipe 18;
the outer walls of the first section of central tube 9, the second section of central tube 10, the third section of central tube 18, the first group of unsealing devices a and the second group of unsealing devices b are processed with water-swellable rubber 2.
Referring to fig. 4, a first deblocking ring 12 is arranged at the lower end of a first section of a base pipe 9, a first shoulder 11 and a second shoulder 14 are respectively arranged on the inner sides of two ends of a deblocking lining pipe 4, a second deblocking ring 13 is arranged at the upper end of a second section of the base pipe 10, and the first shoulder 11 and the second shoulder 14 of the deblocking lining pipe 4 are respectively matched with the first deblocking ring 12 of the first section of the base pipe 9 and the second deblocking ring 13 of the second section of the base pipe 10; similarly, the deblocking device between the second section of central pipe and the third section of central pipe is the same as the deblocking device between the first section of central pipe and the second section of central pipe, and a plurality of stages of deblocking devices and a plurality of sections of central pipes can be added according to the length of the well-descending pipe column.
Referring to fig. 6, a first baffle ring 3 and a second baffle ring 7 of the present invention have isosceles trapezoid cross sections, the lower bottom of the first baffle ring 3 is fixedly connected to the outer wall of a first section of central tube 9, the lower bottom of the second baffle ring 7 is fixedly connected to the outer wall of a second section of central tube 10, and the inner cavities of the first baffle ring 3 and the second baffle ring 7 are hollow structures;
first keep off and be equipped with intercommunicating pore 7.1 on two waists that ring 3 and second kept off ring 7, keep off the inner chamber packing that ring 3 and second kept off ring 7 at first and have water-absorbing resin, resin and water-swelling rubber 2 intercommunication will absorb water, form the swell after the water-swelling protruding 17 to the expansibility has been strengthened in two waists department, thereby the extending direction who makes two waists has formed the inflation arch, water-swelling rubber's leakproofness has further been strengthened, the not good problem of sealing that inhomogeneous inflation appears has been avoided.
The third baffle ring outside the third section of the central tube is also of the structure and is not described in detail.
In addition, the length of the deblocking liner 4 is less than one third, preferably one fifth, of the deployed length between the first baffle ring 3 and the second baffle ring 7, so that the water-swellable rubber is prevented from being broken, and the second baffle ring and the third baffle ring play an auxiliary role, so that the whole packer is ensured to be lifted; in addition, the deblocking liner installed between the second retaining ring 7 and the third retaining ring is also the same as the deblocking liner installed between the first retaining ring 3 and the second retaining ring 7.
During the deblocking, refer to figures 2 and 3, first deblocking shear pin 5 and second deblocking shear pin 6 cut off in proper order, and the water-swelling rubber that has expanded constantly narrows down at the in-process that shifts up of deblocking bushing pipe 4, and the attenuation, and then released expanding pressure, when lifting in addition, the third of second fender ring and lower part keeps off the ring and also plays the supporting role to meeting water-swelling rubber, and the effectual lifting of whole packer that has guaranteed.
The invention provides a using method of a multi-stage releasable water-swelling packer, which adopts the technical scheme that the using method comprises the following steps:
firstly, assembling a multi-stage releasable water-swelling packer, which comprises three sections of central pipes, one group of water-swelling rubber and two groups of deblocking devices, wherein the water-swelling rubber is processed on the outer sides of the three sections of central pipes and the two groups of deblocking devices; each group of deblocking devices comprises a first retaining ring 3, a deblocking liner pipe 4, a first deblocking shear pin 5, a second deblocking shear pin 6 and a second retaining ring 7;
the middle part of the deblocking lining pipe 4 is fixed with a first section of central pipe 9 through a first deblocking shear pin 5, a second section of central pipe 10 is fixed through a second deblocking shear pin 6, a first baffle ring 3 is fixed on the outer wall of the middle part of the first section of central pipe 9, an upper joint 1 is arranged at the upper end of the first section of central pipe 9, a second baffle ring 7 is fixed on the outer wall of the middle part of the second section of central pipe 10, a third baffle ring 19 is arranged on the outer wall of a third section of central pipe 18, and a lower joint 8 is arranged at the lower end of the third section of central pipe 18;
the outer walls of the first section of central tube 9, the second section of central tube 10, the third section of central tube 18, the first group of unsealing devices a and the second group of unsealing devices b are processed with water-swellable rubber 2;
secondly, the device is put into a preset position to be sealed in a barefoot well or a sleeve, the water-swellable rubber 2 begins to swell when meeting water, the first blocking ring, the second blocking ring and the third blocking ring are filled with water-absorbent resin, the two waist parts of the first blocking ring, the second blocking ring and the third blocking ring are respectively provided with a communication hole 7.1, and the water-swellable rubber 2 is driven to further swell when meeting water by the water-absorbent resin to form a bulge 17, so that the sealing effect on the well wall is further enhanced;
thirdly, when the well is repaired and is unsealed, the first section of the base pipe 9 is lifted, the first section of the base pipe 9 moves upwards and cuts the first unsealing shear pin, the first section of the base pipe 9 continues to move upwards, when the first unsealing stop ring 12 moves upwards to the first shoulder 11 of the unsealing liner pipe 4, the first section of the base pipe 9 drives the unsealing liner pipe 4 to move upwards, the second unsealing shear pin 6 is cut, the unsealing liner pipe 4 continues to move upwards, and when the second shoulder 14 contacts the second unsealing stop ring 13, the unsealing liner pipe 4 stops moving upwards; at this moment, a deblocking distance is kept between the first section of central tube 9 and the second section of central tube 10, the water-swellable rubber 2 is pulled apart by a deblocking distance, the thickness of the water-swellable rubber 2 is narrowed, so that the pressure of the bulge 17 of the swelling bag is released, the packer moves upwards, after the packer continues to be lifted upwards, the second section of central tube 9 drives the third section of central tube 18 to realize deblocking and lifting of the second section of packer upwards, and finally, the overall lifting of the multi-stage deblocking type water-swellable packer is realized, which is specifically referred to fig. 2 and fig. 3.
In embodiment 3, referring to fig. 8, the cavities of the first, second, and third baffle rings of the present invention are filled with water-absorbent resin, the cross sections of the baffle rings are isosceles triangles, and the two waists are provided with communicating holes in the shape of a bell mouth, which are wider at the outside and narrower at the inside, so that the structure is more favorable for water absorption, and the water-absorbent resin in the inner cavity can be slowly released to play a local slow release role. When water is expanded, the water-swelling rubber 2 can form an extrusion effect along the directions of the two edges due to the action of the water-absorbing resin in the baffle ring, and further extrusion is carried out, so that the water-swelling rubber forms bulge bulges 17 along the extending directions of the two waists.
The above description is only a few of the preferred embodiments of the present invention, and any person skilled in the art may modify the above-described embodiments or modify them into equivalent ones. Therefore, any simple modifications or equivalent substitutions made in accordance with the technical solution of the present invention are within the scope of the claims of the present invention.
Claims (5)
1. The utility model provides a multistage formula of can deblocking meets water inflation packer which characterized by: the water-swelling rubber is processed on the outer sides of the three sections of central tubes and the two groups of sealing devices, a first group of sealing devices (a) is arranged between the first section of central tube and the second section of central tube, and a second group of sealing devices (b) is arranged between the second section of central tube and the third section of central tube; the first group of deblocking devices comprise a first blocking ring (3), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a second blocking ring (7), and the second group of deblocking devices comprise a second blocking ring (7), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a third blocking ring;
the middle part of the deblocking lining pipe (4) is fixed with a first section of central pipe (9) through a first deblocking shear pin (5), a second section of central pipe (10) is fixed through a second deblocking shear pin (6), a first baffle ring (3) is fixed on the outer wall of the middle part of the first section of central pipe (9), the upper end of the first section of central pipe (9) is provided with an upper joint (1), the outer wall of the middle part of the second section of central pipe (10) is fixed with a second baffle ring (7), the outer wall of a third section of central pipe (18) is provided with a third baffle ring, and the lower end of the third section of central pipe (18) is provided with a lower joint (8);
the outer walls of the first section of central tube (9), the second section of central tube (10), the third section of central tube (18), the first group of unsealing devices (a) and the second group of unsealing devices (b) are processed with water-swellable rubber (2);
the lower end of the first section of the central pipe (9) is provided with a first deblocking ring (12), the inner sides of two ends of the deblocking lining pipe (4) are respectively provided with a first shoulder (11) and a second shoulder (14), the upper end of the second section of the central pipe (10) is provided with a second deblocking ring (13), and the first shoulder (11) and the second shoulder (14) of the deblocking lining pipe (4) are respectively matched with the first deblocking ring (12) of the first section of the central pipe (9) and the second deblocking ring (13) of the second section of the central pipe (10);
the inner edge of the first shoulder (11) is provided with a convex inner steel ring (16) which is used for being firmly matched with the first deblocking stop ring (12), and the inner edge of the second shoulder (14) is provided with a convex inner steel ring (16) which is used for being firmly matched with the second deblocking stop ring (13);
the outer edges of the first deblocking baffle ring (12) and the second deblocking baffle ring (13) are respectively provided with a convex outer steel ring (15).
2. The multi-stage, deblockable, water-swellable packer of claim 1, wherein: the first baffle ring (3) and the second baffle ring (7) are of isosceles trapezoid structures in cross section, the lower bottom of the first baffle ring (3) is fixedly connected with the outer wall of the first section of central tube (9), the lower bottom of the second baffle ring (7) is fixedly connected with the outer wall of the second section of central tube (10), and inner cavities of the first baffle ring (3) and the second baffle ring (7) are of hollow structures.
3. The multi-stage releasable water-swellable packer of claim 2, wherein: first keep off and be equipped with intercommunicating pore (7.1) on two waists of ring (7) and second fender ring (3), keep off the inner chamber packing that ring (7) had at first fender ring (3) and second and have water-absorbing resin, with water-absorbing resin and water-swelling rubber (2) intercommunication, water-swelling rubber (2) form the swell after water-swelling protruding (17).
4. The multi-stage releasable water-swellable packer of claim 2, wherein: the length of the deblocking lining pipe (4) is less than one third of the expansion length between the first retaining ring (3) and the second retaining ring (7).
5. The use method of the multi-stage releasable water-swellable packer according to claim 3, characterized by comprising the steps of:
firstly, assembling a multi-stage releasable water-swelling packer, which comprises three sections of central pipes, one group of water-swelling rubber and two groups of deblocking devices, wherein the water-swelling rubber is processed on the outer sides of the three sections of central pipes and the two groups of deblocking devices, a first group of deblocking devices (a) is arranged between the first section of central pipe and the second section of central pipe, and a second group of deblocking devices (b) is arranged between the second section of central pipe and the third section of central pipe; the first group of deblocking devices comprise a first blocking ring (3), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a second blocking ring (7), and the second group of deblocking devices comprise a second blocking ring (7), a deblocking liner tube (4), a first deblocking shear pin (5), a second deblocking shear pin (6) and a third blocking ring;
the middle part of the deblocking lining pipe (4) is fixed with a first section of central pipe (9) through a first deblocking shear pin (5), a second section of central pipe (10) is fixed through a second deblocking shear pin (6), a first baffle ring (3) is fixed on the outer wall of the middle part of the first section of central pipe (9), an upper joint (1) is arranged at the outer end of the first section of central pipe (9), a second baffle ring (7) is fixed on the outer wall of the middle part of the second section of central pipe (10), a third baffle ring is arranged on the outer wall of the third section of central pipe (18), and a lower joint (8) is arranged at the outer end of the third section of central pipe (18);
the outer walls of the first section of central tube (9), the second section of central tube (10), the third section of central tube (18), the first group of unsealing devices (a) and the second group of unsealing devices (b) are processed with water-swellable rubber (2);
secondly, the device is put into a preset position to be sealed in a barefoot well or a sleeve, the water-swellable rubber (2) begins to swell when meeting water, and the first, second and third baffle rings are filled with water-absorbent resin due to the fact that the interior of the first, second and third baffle rings is filled with the water-absorbent resin, and communication holes are formed in the two waist portions respectively, the water-swellable rubber (2) is driven to further swell when meeting water by the water-absorbent resin, so that bulge bulges (17) are formed, and the sealing effect on the well wall is further enhanced;
thirdly, when the well is repaired and is unsealed, the first section of the central pipe (9) is lifted, the first section of the central pipe (9) moves upwards and cuts the first unsealing shear pin, the first section of the central pipe (9) continues to move upwards, when the first unsealing stop ring (12) moves upwards to the first shoulder (11) of the unsealing liner pipe (4), the first section of the central pipe (9) drives the unsealing liner pipe (4) to move upwards, the second unsealing shear pin (6) is cut simultaneously, the unsealing liner pipe (4) continues to move upwards, and when the second shoulder (14) contacts the second unsealing stop ring (13), the unsealing liner pipe (4) stops moving upwards; at the moment, a deblocking distance is kept between the first section of central pipe (9) and the second section of central pipe (10), the water-swelling rubber (2) is pulled apart by the length of the deblocking distance, the thickness of the water-swelling rubber (2) is narrowed, the pressure of bulge (17) is released, the packer is moved upwards, after the packer is continuously lifted upwards, the second section of central pipe (9) drives the third section of central pipe (18) to realize deblocking and lifting, the second section of packer is moved upwards, and finally the overall lifting of the multi-stage deblocking type water-swelling packer is realized.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910925540.3A CN110725660B (en) | 2017-11-27 | 2017-11-27 | Multistage releasable water-swelling packer and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201711205975.8A CN107989568B (en) | 2017-11-27 | 2017-11-27 | A kind of multistage can desealed water-swelling packer and method |
| CN201910925540.3A CN110725660B (en) | 2017-11-27 | 2017-11-27 | Multistage releasable water-swelling packer and method |
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| CN109915068B (en) * | 2019-03-12 | 2020-07-07 | 煤科集团沈阳研究院有限公司 | Device and method for automatic water absorption and plugging of near-horizontal coal seam gas drainage boreholes |
| CN111811059B (en) * | 2020-08-07 | 2021-06-22 | 东阳市天杨建筑工程设计有限公司 | Air conditioner installation machine position of building body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2441973Y (en) * | 2000-07-25 | 2001-08-08 | 杨朝杰 | Water injection packet for oil field |
| CN2535548Y (en) * | 2001-05-30 | 2003-02-12 | 杨朝杰 | Double-valve pressure difference water-filling expansion-packing packer |
| CN2540507Y (en) * | 2002-03-04 | 2003-03-19 | 杨朝杰 | Integral waterflooding device consisting of packer and eccentric injection well down-hole flow |
| GB2428263B (en) * | 2004-03-12 | 2008-07-30 | Schlumberger Holdings | Sealing system and method for use in a well |
| RU2413836C2 (en) * | 2006-09-11 | 2011-03-10 | Хэллибертон Энерджи Сервисиз, Инк. | Procedure for forming circular barrier in underground well, procedure for making well packer and design of well packer |
| US20100163254A1 (en) * | 2007-06-07 | 2010-07-01 | Saltel Industries | Device For Sealing Off A Well And A Pipe And A Fitting Method |
| CN202176305U (en) * | 2011-04-29 | 2012-03-28 | 中国石油化工股份有限公司 | Self-expandable packer with protrusion-resisting protective device |
| CN202273637U (en) * | 2011-10-29 | 2012-06-13 | 中国石油集团西部钻探工程有限公司 | Overlapping type oil swelling packer |
| CN202381031U (en) * | 2011-12-28 | 2012-08-15 | 中国石油天然气股份有限公司 | Horizontal Well Packer |
| CN202544801U (en) * | 2012-01-04 | 2012-11-21 | 中国石油化工股份有限公司 | Assembled fluid-swelling packer |
| CN202882841U (en) * | 2012-09-28 | 2013-04-17 | 中国石油化工股份有限公司 | Pipe external packer capable of being self-expandable when encountering water or oil |
| CN104100227B (en) * | 2013-04-03 | 2016-08-10 | 中国石油天然气股份有限公司 | Method for preventing falling objects of horizontal well |
| CN104213865A (en) * | 2013-06-05 | 2014-12-17 | 中国石油天然气集团公司 | Self-expansion method improving sealing ability and self-expansion packer |
| CN203570259U (en) * | 2013-08-16 | 2014-04-30 | 深圳市百勤石油技术有限公司 | Anchoring packer |
| CN203716919U (en) * | 2013-12-31 | 2014-07-16 | 安东石油技术（集团）有限公司 | Open hole packer |
| CN204457580U (en) * | 2014-12-12 | 2015-07-08 | 中国石油天然气股份有限公司 | Composite packer |
| CN204532229U (en) * | 2015-01-20 | 2015-08-05 | 中国石油天然气股份有限公司 | Water self-expansion pipe external packer |
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| CN110725660A (en) | 2020-01-24 |
| CN107989568B (en) | 2019-11-22 |
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