CN115704282A - Independent deblocking water injection packer - Google Patents
Independent deblocking water injection packer Download PDFInfo
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- CN115704282A CN115704282A CN202110923514.4A CN202110923514A CN115704282A CN 115704282 A CN115704282 A CN 115704282A CN 202110923514 A CN202110923514 A CN 202110923514A CN 115704282 A CN115704282 A CN 115704282A
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- sleeve
- water injection
- backwashing
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 238000002347 injection Methods 0.000 title claims abstract description 94
- 239000007924 injection Substances 0.000 title claims abstract description 94
- 238000011001 backwashing Methods 0.000 claims abstract description 62
- 230000007246 mechanism Effects 0.000 claims abstract description 55
- 238000007789 sealing Methods 0.000 claims description 173
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- 238000011084 recovery Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses an independent deblocking water injection packer, and relates to the field of petroleum injection and production. Comprises a deblocking mechanism and a backwashing mechanism; the deblocking mechanism comprises an upper joint, a deblocking shear pin, a shear ring and a releasing section arranged on the lower rubber cylinder base; the deblocking shear pin is arranged in a radial threaded hole in the middle upper part of the upper joint; the shear rings are two semicircular rings and are arranged in the rabbet grooves at the end parts of the upper joints; the embodiment of the disclosure is applied to oilfield separate layer water injection, can perform dual independent deblocking and releasing, solves the problems that the existing packer deblocking load is large, and the blockage cannot be caused when deblocking so that the overhaul rate is high, and reduces the operation cost.
Description
Technical Field
The invention relates to the field of petroleum injection and production, in particular to an independent deblocking water injection packer.
Background
Water injection is an important exploitation mode for oil field development, and is an effective method for supplementing stratum energy and maintaining long-term high and stable yield of an oil field. For oil fields with multiple oil layers, in order to adjust the contradiction between layers, control the rising of the water content of crude oil and improve the recovery ratio of crude oil, separate layer water injection should be carried out. In this regard, a water injection packer is usually used in conjunction with a water injection string to perform zonal water injection in an oil field during water injection.
The existing water injection packer mainly comprises an upper joint, a central pipe, an upper outer sleeve, an outer sleeve, a deblocking shear pin, a locking assembly, a backwashing assembly, a sealing assembly, a setting assembly, a lower central pipe, a lower joint and other parts. The upper joint, the central pipe, the lower central pipe and the lower joint are concentrically connected through threads in sequence to form an inner tool cylinder; the outer part of the inner cylinder is sequentially and concentrically provided with an upper outer sleeve, an outer sleeve, a locking assembly, a backwashing assembly, a sealing assembly and a setting assembly from top to bottom; the upper end of the upper outer sleeve is connected with an upper connector, and the lower end of the upper outer sleeve is concentrically sleeved outside the outer sleeve and fixed through a deblocking shear pin. When the sealing rubber tube is unsealed, the upper joint is lifted, the tool inner tube and the upper outer sleeve are driven to move upwards, the unsealing pin is cut off, the locking assembly moves downwards, and the sealing rubber tube is recovered and unsealed under the action of the elasticity of the sealing rubber tube.
However, when the existing water injection packer lifts the pipe string after being lifted up, each level of water injection packer simultaneously releases to enable the release load to be larger, and the pipe string cannot be released when being blocked in the release process, so that the pipe lifting overhaul rate of a multi-level separate injection well is high, and the development cost of an oil field is seriously influenced.
Disclosure of Invention
The invention discloses an independent deblocking water injection packer which is used as a matched tool of a separate-layer water injection string, and aims to solve the problems that the existing water injection packer has large deblocking load and the string cannot be released when being blocked, so that the overhaul rate is high, and reduce the operation cost.
The invention provides an independent deblocking water injection packer which comprises a backwashing mechanism and a deblocking mechanism; the backwashing mechanism comprises a backwashing closing mechanism and a backwashing sealing mechanism; the backwashing closing mechanism is designed by adopting a combined structure of a pre-tightening spring and two-stage pistons which are connected in series; the backwashing sealing mechanism adopts a combined structure design of steel body linear sealing and rubber interference extrusion sealing;
the backwashing mechanism is used for communicating the upper layer with the lower layer to realize backwashing, and comprises a central pipe, an outer central pipe, a lower rubber cylinder seat, a sealing ring sleeve, an upper piston and a spring; the outer central tube is sleeved outside the central tube; the central pipe is spliced with the upper connector, the upper part of the outer wall is provided with 1 annular groove, the middle part is provided with a large section of reducing diameter, an annular backwashing channel is formed with the inner wall of the outer central pipe, the lower end is provided with a liquid outlet I, and the lower central pipe is connected with the lower central pipe through threads; the middle part of the lower rubber cylinder seat is provided with internal threads which are connected with the outer central pipe, the lower end of the lower rubber cylinder seat is sequentially provided with a releasing section and a sealing outer inclined plane, and the lower end of the lower rubber cylinder seat is abutted against the upper piston; the lower rubber cylinder seat is connected with the sealing ring sleeve through threads; the sealing ring is arranged in an annular space formed by the lower rubber cylinder seat and the sealing ring sleeve;
the deblocking mechanism is used for double independent deblocking and releasing after blockage, and comprises the upper joint, a central pipe, a shear ring, a shear pin sleeve, deblocking shear pins, a lower rubber cylinder seat, a support sleeve and the outer central pipe; the deblocking shear pin is used for being sheared to finish double deblocking when deblocking is carried out; the shear ring is used for being sheared to realize double deblocking when one-time deblocking is not realized when the shear ring is blocked, and meanwhile, the plug of the central pipe is separated from the slot of the upper joint to realize the communication of the oil sleeve; the lower rubber barrel seat is provided with a releasing section for breaking the releasing section to realize releasing when a lower packer cannot be released; the shear rings are two semicircular rings and are sleeved in the central pipe ring grooves; the shear pin sleeve is in a stepped annular shape, and through holes matched with the diameter and the number of the deblocking shear pins are circumferentially arranged at the lower end of the shear pin sleeve.
Optionally, the backwashing closing mechanism adopts a combined structure design of a pre-tightening spring and a two-stage piston in series, and the combined structure design is as follows: the upper part of the upper piston is provided with a sealing inner inclined plane, a sealing arc surface and a sealing circular surface, an inner hole at the lower part is provided with a spring cavity which is sleeved on the outer wall of the central tube, the spring is arranged in an annular space formed by the upper piston and the central tube, and the lower end of the annular space is abutted against the lower piston; the lower piston is in a concentric step cylinder shape, is sleeved on the outer wall of the lower central pipe and is sealed by an O-shaped sealing ring; the pre-tightening spring is the spring arranged in the inner cavity of the upper piston; the upward thrust formed when the spring is reset and extended can be adjusted by adjusting the screwing length of the connecting thread pair of the central pipe and the lower central pipe; the two-stage pistons are respectively the upper piston and the lower piston and are used for enabling water to enter the upper piston and the lower piston to respectively form upward thrust when water is injected; and the upward thrust formed when the spring is reset and extended and the upward thrust formed when the upper piston and the lower piston are filled with water act together to close the backwashing channel.
Optionally, the backwashing sealing mechanism is designed by adopting a combined structure of steel body linear sealing and rubber interference extrusion sealing: the sealing ring is arranged in an annular space formed by the lower rubber cylinder seat and the sealing ring sleeve, and all generated contact surfaces are in interference extrusion sealing; the sealing circular surface of the upper piston and the inner sealing surface I of the sealing ring are in interference extrusion sealing; the sealing cambered surface II of the upper piston and the sealing inclined surface of the sealing ring are in end face extrusion sealing; the upper inclined plane of the upper piston and the lower inclined plane of the lower rubber cylinder seat are steel body line seals formed by different angles.
Optionally, the upper joint is in a stepped ring shape, an oil pipe internal thread is arranged at the upper part of the hole wall and used for connecting an oil pipe, 2 arc-shaped slots are symmetrically arranged in the middle of the hole wall, 2 annular grooves are arranged on the hole wall at the lower part and used for mounting an O-shaped sealing ring, a spigot groove is arranged at the end part and used for accommodating the shear ring, and the lower part of the upper joint is connected with the upper outer sleeve through a thread; the upper outer sleeve is tubular, the upper part of the upper outer sleeve is provided with internal threads connected with the upper joint, the middle upper part of the upper outer sleeve is provided with radial threaded holes matched with the number of the deblocking shear pins and used for installing the deblocking shear pins, the lower part of the upper outer sleeve is provided with internal threads connected with the upper cylinder seat, and the middle lower part of the upper outer sleeve is provided with radial threaded holes used for installing the setting shear pins and long circular outer liquid inlet holes used for enabling well washing liquid to smoothly enter the backwashing channel; go up the feed cylinder seat and be the ladder cyclic annular, upper portion sets up the external screw thread for connect go up the overcoat, the lower part hole with outer center tube outer wall cooperation is sealed through O shape sealing washer.
Optionally, the spring is a compression spring made of an anticorrosive material.
Optionally, the outer diameter of the sealing circular surface of the upper piston is larger than the inner diameter of the inner sealing surface I of the sealing ring, and a radial extrusion seal is formed through interference fit; the sealing arc surface II of the upper piston props against the sealing inclined surface of the sealing ring under the action of the closing power of the backwashing channel to form end surface extrusion sealing; the inner seal of the upper piston is propped against the outer seal inclined plane of the lower rubber cylinder seat under the action of the closing power of the backwashing channel to form steel body line seal.
Optionally, the outer diameter of the sealing inner inclined plane is larger than that of the sealing outer inclined plane; the acute angle included by the central line of the sealing inner inclined plane and the independent deblocking water injection packer is larger than the acute angle included by the central line of the sealing outer inclined plane and the independent deblocking water injection packer.
Optionally, the upper part of the central tube is plugged with the upper joint, and the lower part of the central tube is concentrically connected with the lower central tube and the lower joint through threads in sequence to form an inner tube; the periphery is concentrically provided with the deblocking mechanism, the locking mechanism, the sealing mechanism, the backwashing mechanism, the setting mechanism and the anti-setting mechanism.
Optionally, the inner hole of the center tube is a through hole, and 2 arc plugs are arranged at the upper end of the center tube and are inserted into 2 arc slots of the upper joint.
Optionally, the maximum diameter of the outer circle of the upper part of the central tube is smaller than the inner diameters of the shear pin seat and the outer central tube and is larger than the minimum inner diameter of the lower rubber cylinder seat, so that the central tube is clamped at the minimum inner diameter of the lower rubber cylinder seat in the process of moving downwards relatively.
In the embodiment of the disclosure, by matching with the separate-zone water injection string, each packer has double deblocking functions, so that the deblocking success rate is improved; the combined sealing structure of steel body linear sealing and rubber interference extrusion is adopted, so that the backwashing channel has reliable sealing performance; the design of a combined structure of a pre-tightening spring and two-stage piston series connection is adopted to ensure that the backwashing channel is reliably closed; the device has the functions of independent unsealing and step-by-step unsealing, and the unsealing load is reduced; the oil jacket communication function is achieved, and the pipe lifting load is reduced; the device has the function of releasing when the pipe is blocked, improves the success rate of minor repair, meets the requirement of safe pipe lifting of the separated layer water injection pipe column, and effectively reduces the operation cost.
The foregoing description is only an overview of the technical solutions of the present disclosure, and the embodiments of the present disclosure are described below in order to make the technical means of the present disclosure more clearly understood and to make the above and other objects, features, and advantages of the present disclosure more clearly understandable.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an independent unset water injection packer provided in an embodiment of the present invention;
FIG. 2 is a schematic view of a lower rubber cylinder base structure provided in an embodiment of the present invention;
FIG. 3 is a schematic view of an upper piston structure provided in an embodiment of the present invention;
FIG. 4 is a schematic illustration of a center tube configuration provided in an embodiment of the present invention;
FIG. 5 is a schematic illustration of a centertube plug construction provided in an embodiment of the present invention;
FIG. 6 is a schematic view of a seal ring structure provided in an embodiment of the present invention;
FIG. 7 is a schematic view of a seal ring sleeve configuration provided in an embodiment of the present invention;
FIG. 8 is a schematic view of a shear ring provided in an embodiment of the present invention;
FIG. 9 is a schematic view of a header structure provided in an embodiment of the present invention;
FIG. 10 is a schematic view of a top connector socket structure provided in an embodiment of the present invention;
FIG. 11 is a schematic view of an independently unset water injection packer set state as provided in an embodiment of the present invention;
FIG. 12 is a schematic diagram illustrating a primary unset state of an independent unset water injection packer according to an embodiment of the present disclosure;
FIG. 13 is a schematic diagram illustrating a secondary unset state of an independent unset water injection packer according to an embodiment of the present disclosure;
FIG. 14 is a schematic illustration of a portion of a well that exits after a separate unset water injection packer is tripped in accordance with an embodiment of the invention;
FIG. 15 is a schematic illustration of a well-retention section after release of an independent de-packer provided in an embodiment of the invention;
FIG. 16 is a schematic view of a backwash channel outlet sealing structure of an independent deblocking water injection packer provided in an embodiment of the invention;
FIG. 17 is a schematic structural diagram of a three-stage three-section separate zone water injection string provided in an embodiment of the present invention;
FIG. 18 is a flow chart illustrating the operation of an independent unset water injection packer provided in an embodiment of the present invention;
FIG. 19 is a flow chart illustrating unsetting of an independent unset water injection packer of FIG. 18;
FIG. 20 is a flow chart of an embodiment of a process for implementing an independent unset water injection packer provided in an embodiment of the present invention;
FIG. 21 is a flow chart of a pipe-lifting operation in the practice of the embodiment shown in FIG. 20.
The elements in the figures are numbered:
1 upper joint, 1-1 internal thread, 1-2 slot, 1-3 ring groove, 1-4 stopping groove, 2 central tube, 2-1 plug, 2-2 ring groove, 2-3 excircle, 2-4 liquid outlet I, 3O-shaped sealing ring, 4 upper coat, 5 shear ring, 6 shear pin sleeve, 7 deblocking shear pin, 8 support sleeve, 9 lock ring, 10 lock sleeve, 11 shear pin seat, 12 setting shear pin, 13 upper rubber cylinder seat, 14 outer central tube, 15 protective bowl, 16 end rubber cylinder, 17 spacer ring, 18 middle rubber cylinder, 19 lower rubber cylinder seat, 19-1 releasing cross section, 19-2 sealing outer inclined plane, 20 sealing ring, 20-1 sealing inclined plane, 20-2 inner sealing plane I, 20-3 dovetail angle, 21 sealing ring sleeve, 21-1 inner sealing plane II 21-2 dovetail grooves, 22 upper pistons, 22-1 sealing inner inclined planes, 22-2 sealing arc surfaces, 22-3 sealing circular surfaces, 22-4 spring cavities, 23 springs, 24 lower central pipes, 24-1 liquid outlet II, 25 lower pistons, 26 lower joints, 27 protection rings, 28 backwashing channels, 29 inner liquid inlet holes, 30 outer liquid inlet holes, 31 oil pipes, 32 anchors, 33-1 first-stage independent deblocking water injection packers, 33-2 second-stage independent deblocking water injection packers, 33-3 third-stage independent deblocking water injection packers, 34 eccentric water distributors, 35 fixing ball seats, 36 sieve pipes, 37 plugs, 38-1 first water injection layers, 38-2 second water injection layers, 38-3 third water injection layers and 39 artificial well bottoms.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides an independent deblocking water injection packer which comprises an upper connector 1, a central pipe 2, an O-shaped sealing ring 3, an upper outer sleeve 4, a shear ring 5, a shear pin sleeve 6, a deblocking shear pin 7, a supporting sleeve 8, a locking ring 9, a locking sleeve 10, a shear pin seat 11, a setting shear pin 12, an upper cylinder seat 13, an outer central pipe 14, a protection bowl 15, an end rubber cylinder 16, a spacer ring 17, a middle rubber cylinder 18, a lower rubber cylinder seat 19, a sealing ring 20, a sealing ring sleeve 21, an upper piston 22, a spring 23, a lower central pipe 24, a lower piston 25, a lower connector 26 and a protection ring 27, as shown in figure 1. The upper part of the central tube 2 is spliced with the upper joint 1, and the lower part of the central tube is concentrically connected with the lower central tube 24 and the lower joint 26 through threads in sequence to form an inner tube; the periphery is concentrically provided with an unsealing mechanism, a locking mechanism, a sealing mechanism, a backwashing mechanism, a setting mechanism and an anti-setting mechanism.
The sealing mechanism acts under the action of external force to seal an annular space and prevent fluid from passing through, and comprises at least 1 protective bowl 15, 2 end rubber cylinders 16, 2 spacer rings 17 and 1 middle rubber cylinder 18, wherein the protective bowl 15 is bowl-shaped, and the middle part of the protective bowl is concentrically provided with a through hole; the end rubber cylinder 16 is cylindrical, and an outer circle at one end is provided with a 45-degree inclined plane to be matched with an inner inclined plane of the protection bowl 15; the spacer ring 17 is annular, and air holes are radially arranged on the annular wall; the middle rubber cylinder 18 is cylindrical, and the two ends of the middle rubber cylinder are sequentially provided with the spacer ring 17, the end rubber cylinder 16 and the protection bowl 15 respectively.
The setting mechanism is a mechanism for enabling the packer to enter a sealing state and comprises a shear pin seat 11, a setting shear pin 12, a lower rubber cylinder seat 19, an upper piston 22, a spring 23, a lower central tube 24, a lower piston 25 and a lower joint 26, wherein the shear pin seat 11 is in a stepped ring shape, the upper part of the outer wall is provided with an external thread for connecting a lock sleeve 10, the lower part of the outer wall is provided with 1 ring groove for installing the setting shear pin 12, and the lower end of the inner wall is provided with an internal thread for connecting an outer central tube 14; the diameter and the number of the setting shear pins 12 are set according to setting pressure, and are uniformly distributed in the circumferential direction; the upper part of the lower central tube 24 is provided with internal threads connected with the central tube 2, and the lower part is provided with a liquid outlet II 24-1 and external threads connected with a lower joint 26; the outer wall of the lower joint 26 is provided with an O-shaped sealing ring 3, and the middle part and the lower part are provided with external threads; as shown in fig. 2, the middle part of the lower rubber cylinder seat 19 is provided with internal threads which are connected with the outer central tube 14, the lower end of the lower rubber cylinder seat is provided with a releasing section 19-1 and a sealing outer inclined plane 19-2 in sequence, and the lower end of the lower rubber cylinder seat is propped against the upper piston 22; as shown in fig. 3, the upper piston 22 is provided with a sealing inner inclined plane 22-1, a sealing arc surface 22-2 and a sealing circular surface 22-3 at the upper part, a spring cavity 22-4 is arranged in an inner hole at the lower part and sleeved on the outer wall of the central tube 2, the spring 23 is arranged in an annular space formed by the upper piston and the lower piston, and the lower end of the annular space abuts against the lower piston 25; the lower piston 25 is in a concentric stepped cylinder shape, is sleeved on the outer wall of the lower central tube 24 and is sealed through an O-shaped sealing ring 3.
The locking mechanism is a mechanism for keeping the packer in a sealing state and comprises a support sleeve 8, a locking ring 9, a locking sleeve 10 and an outer central tube 14, wherein the locking ring 9 is in a concentric ring shape with an opening, a plurality of outer ridge buckles with inclined angles are arranged on the outer wall of the locking ring and sleeved in a ring groove at the lower end of the support sleeve 8; the supporting sleeve 8 is in a concentric cylinder shape, 2 annular grooves are formed in the outer wall of the supporting sleeve, and the supporting sleeve is sleeved on the outer wall of the central tube 2; the lock sleeve 10 is in a concentric tubular shape, a plurality of inner horse-tooth buckles with downward inclination angles are arranged on the upper part of the inner wall, and the lower part of the inner horse-tooth buckles is connected with the shear pin seat 11 through threads; and external threads are arranged at two ends of the outer central tube 14, and a smooth sealing surface is arranged in the middle of the outer central tube and is used for sealing the packer with an inner hole of the rubber sleeve after the packer is set.
The backwashing mechanism is used for communicating the oil sleeve to realize backwashing and well washing, and comprises a central pipe 2, an outer central pipe 14, a lower rubber cylinder seat 19, a sealing ring 20, a sealing ring sleeve 21, an upper piston 22 and a spring 23, wherein the outer central pipe 14 is sleeved outside the central pipe 2; the central tube 2 is provided with an inner hole which is a through hole as shown in figure 4, 2 arc plugs 2-1 are arranged at the upper end, as shown in figure 5, the central tube is spliced with an upper connector 1, 1 annular groove 2-2 is arranged at the upper part of the outer wall, a large section of reducing diameter is arranged at the middle part, an annular backwashing channel 28 is formed with the inner wall of the outer central tube 14, and a liquid outlet I2-4 and threads are arranged at the lower end and connected with a lower central tube 24; the lower rubber cylinder seat 19 is connected with a sealing ring sleeve 21 through a thread pair, and the sealing ring 20 is arranged in an annular space formed by the lower rubber cylinder seat and the sealing ring sleeve. As shown in FIG. 6, the inner hole of the sealing ring 20 is stepped, and the middle lower part of the sealing ring is sequentially provided with a sealing inclined plane 20-1, an inner sealing surface I20-2 and a dovetail angle 20-3; as shown in FIG. 7, the sealing ring sleeve 21 is provided with an inner sealing surface II 21-1 at the middle part and a dovetail groove 21-2 at the lower part for accommodating a dovetail angle 20-3.
The deblocking mechanism is a mechanism for deblocking the packer, and comprises a central pipe 2, shear rings 5, shear pin sleeves 6, deblocking shear pins 7, support sleeves 8 and an outer central pipe 14, wherein the shear rings 5 are 2 semicircular rings with certain thickness, and are sleeved in a ring groove of the central pipe 2 as shown in fig. 8; shear pin cover 6 is the ladder cyclic annular, and lower extreme circumference sets up the through-hole that matches with 7 diameters of deblocking shear pin, quantity, makes deblocking shear pin 7 pass, gets into the annular of supporting sleeve 8.
Prevent sitting the mechanism and prevent that packer from going into the well in-process from receiving collision, liquid impact or other resistance effects and setting mechanism in advance, including protection ring 27, protection ring 27 is the ring-type, and the hole sets up the screw thread, with screwed connection in the middle part of lower joint 26, the outer wall sets up 4 radial blind holes for the spanner clamping.
In the above-mentioned separate deblocking water injection packer, the upper joint 1 is in a stepped ring shape, as shown in fig. 9, the upper part of the hole wall is provided with an oil pipe internal thread 1-1 for connecting with an oil pipe, the middle part is symmetrically provided with 2 arc-shaped slots 1-2 (as shown in fig. 10), the lower part of the hole wall is provided with 2 annular grooves 1-3 for installing an O-shaped sealing ring 3, and the end part is provided with a spigot groove 1-4 for accommodating a shear ring 5; the upper outer sleeve 4 is tubular, the upper part of the upper outer sleeve is provided with internal threads connected with the upper connector 1, the middle upper part of the upper outer sleeve is provided with radial threaded holes matched with the deblocking shear pins 7 in number and used for mounting the deblocking shear pins 7, the lower part of the upper outer sleeve is provided with internal threads connected with the upper cylinder seat 13, the middle lower part of the upper outer sleeve is provided with radial threaded holes matched with the setting shear pins 12 in number and long circular outer liquid inlet holes 30, the former is used for mounting the setting shear pins 12, and the latter is used for enabling well washing liquid to smoothly enter the backwashing channel 28; the upper rubber barrel seat 13 is in a stepped ring shape, the upper part of the upper rubber barrel seat is provided with external threads for connecting the upper outer sleeve 4, and the lower inner hole of the upper rubber barrel seat is matched with the outer wall of the outer central pipe 14 and sealed by an O-shaped sealing ring 3.
In the above-mentioned separate deblocking water injection packer, in order to reduce the pipe load, preferably, 2 arc plugs 2-1 (as shown in fig. 5) of the central pipe 2 are plugged with 2 arc slots 1-2 (as shown in fig. 10) of the upper joint 1, so as to prevent the two from rotating relatively, and to disconnect the two when the upper joint is subjected to an upward pulling force, so as to communicate the oil jacket.
In the above-mentioned independent deblocking water injection packer, in order to avoid the packing element recovery after the expansion, preferably, the inner wall of lock sleeve 10 sets up the interior horse teeth knot that the multichannel inclination was downward, the outer wall of catch 9 sets up the outer horse teeth knot that the multichannel inclination was upwards, with just locking after the meshing of the interior horse teeth knot of lock sleeve 10, the packing element recovery after avoiding the seat to seal, sealed inefficacy.
In order to independently unseal and reduce the unsealing load of the tubular column in the independent unsealing water injection packer, preferably, the invention is provided with two independent unsealing mechanisms which take the unsealing shear pin 7 and the shear ring 5 as key components; in order to start the two sets of independent unsealing mechanisms step by step and improve the unsealing success rate, preferably, the unsealing force is designed according to the difference of the field working conditions, and the embodiment of the invention is not particularly limited to this.
Among the above-mentioned independent deblocking water injection packer, in order to ensure after the backwash well is finished, the backwash passageway reliably closes, preferably, adopts "two-stage piston + pretension spring series connection" laborsaving structural design (as shown in fig. 11), realizes that the backwash passageway is self-closing under the low differential pressure condition even zero differential pressure: the spring 23 arranged in the inner cavity of the upper piston 22 is reset and extended to generate upward thrust P1; water injected into the oil pipe enters the inner cavity of the upper piston 22 through the liquid outlet I2-4 to generate upward thrust P2; the liquid enters the inner cavity of the lower piston 25 through the liquid outlet II 24-1 to generate upward thrust P3 to the lower piston, the closing power P = P1+ P2+ P3 of the backwashing channel, and three same-direction forces are superposed to effectively close the backwashing channel.
In the above-mentioned independent deblocking water injection packer, in order to ensure that the backwash channel is closed reliably, even closed automatically under zero pressure difference, that is, only by means of the elastic force P1 of the spring 23, on the premise of ensuring a certain opening pressure of the backwash channel, the closing is achieved by improving the "elastic modulus + pretightening force" of the spring, preferably, the spring 23 is a compression spring made of an anticorrosive material, the diameter of a monofilament is 12mm, the central pipe 2 and the lower central pipe 24 are connected by a long thread pair, so that the return elastic force P1 of the spring 23 can be adjusted by adjusting the screwing length of the thread pair, and the closing can also be achieved by other ways, which is not specifically limited in the embodiment of the present invention.
In the above-mentioned independent deblocking water injection packer, in order to ensure reliable sealing performance of the closed backwash channel, it is preferable to implement a "steel body linear sealing + rubber interference extrusion" combined sealing structure (as shown in fig. 16, fig. 2, fig. 3, fig. 6, and fig. 7), where the combined sealing structure is composed of a lower rubber cylinder seat 19, a sealing ring 20, a sealing ring sleeve 21, and an upper piston 22. The lower rubber cylinder seat 19 is connected with the sealing ring sleeve 21 through a thread pair, the sealing ring 20 is arranged in an annular space formed by the lower rubber cylinder seat and the sealing ring sleeve, and is in interference fit with all contact surfaces of the annular space to form extrusion sealing, the outer diameter of a sealing circular surface 22-3 of the upper piston 22 is larger than the inner diameter of an inner sealing surface I20-2 of the sealing ring 20, and the outer diameter and the inner sealing surface form radial extrusion sealing through interference fit; the sealing arc surface II 22-2 of the upper piston 22 props against the sealing inclined surface 20-1 of the sealing ring 20 under the action of the backwashing channel closing power to form end face extrusion sealing; the inner seal 22-1 of the upper piston 22 props against the seal outer inclined plane 19-2 of the lower rubber cylinder seat 19 under the action of the closing power of the backwashing channel to form steel body line seal; the three sealing structures are reasonably combined, and the sealing performance is guaranteed to be reliable. Other combined sealing structures may also be adopted, and the embodiment of the present invention is not particularly limited thereto.
In the independent deblocking water injection packer, the outer diameter of the sealing inner inclined plane 22-1 is larger than that of the sealing outer inclined plane 19-2; the acute angle between the sealing inner inclined plane 22-1 and the central line of the independent deblocking water injection packer is larger than the acute angle between the sealing outer inclined plane 19-2 and the central line of the independent deblocking water injection packer, so that line sealing is facilitated.
In the above-mentioned separate deblocking water injection packer, the maximum diameter 2-3 of the outer circle of the upper part of the central tube 2 is smaller than the inner diameters of the shear pin seat 11 and the outer central tube 14, and is larger than the minimum inner diameter of the lower rubber cylinder seat 19, so that the central tube 2 is clamped at the minimum inner diameter of the lower rubber cylinder seat 19 in the process of moving down relatively, and at this time, the tubular column is continuously lifted upwards, and the releasing section 19-1 is broken, thereby realizing releasing.
In the above-mentioned packer for independently deblocking and injecting water, in order to improve the sealing performance, preferably, the material of the sealing ring 20, the end packing element 16, the middle packing element 18, and the O-ring 3 is high-temperature oil-resistant rubber, and the outer surface has a small roughness. Other materials may also be used, which is not specifically limited in this embodiment of the present invention.
In the above-mentioned separate deblocking water injection packer (as shown in fig. 11, 6, and 7), in order to prevent the sealing ring 20 from being washed out and sealing failure during reverse well flushing, preferably, the dovetail angle 20-3 of the sealing ring 20 is disposed in the dovetail groove 21-2 of the sealing ring sleeve 21, and other limiting structures may also be adopted, and the embodiment of the present invention is not particularly limited thereto.
The invention has high temperature resistance and pressure resistance indexes, preferably, the invention has the temperature resistance of 150 ℃ and the pressure resistance of 50 MPa, and the temperature resistance index is related to the material performance and the pressure resistance index is related to the material performance and the structure size. The material and the structural size selected in the embodiment of the invention are not particularly limited.
The invention needs to be implemented by depending on a separate-layer water injection pipe column. The separate-layer water injection pipe column comprises an oil pipe, wherein the oil pipe is sequentially connected with an anchor, an independent deblocking water injection packer, an eccentric water distributor, a fixed ball seat, a sieve pipe and a plug through threads.
Taking a multistage separate injection string supporting the present invention as an example, as shown in fig. 18, the present invention operates as follows:
and 101, setting the packer. As shown in fig. 1 and fig. 11, the central tube 2 is filled with clean water and pressurized, the clean water enters the inner cavities of the upper piston 22 and the lower piston 25 through the liquid outlet I2-4 and the liquid outlet II 24-1, the upper piston 22, the lower piston 25, the sealing ring sleeve 21, the lower rubber cylinder seat 19, the sealing ring 20, the outer central tube 14, the shear pin seat 11 and the lock sleeve 10 are pushed to move upwards, the setting shear pin 12 is cut off, the upper central tube continues to move upwards, the end rubber cylinder 16 and the middle rubber cylinder 18 are axially compressed, the inner wall of the sleeve and the outer wall of the outer central tube 14 are radially expanded and extruded to form sealing, and meanwhile, the lock sleeve 10 is meshed and locked with the inner and outer dog buttons of the lock ring 9, so that setting is completed;
and 102, opening a backwashing channel to enable the upper layer and the lower layer to be communicated, and closing the backwashing channel after backwashing is finished. As shown in fig. 11, a flushing fluid is injected into the oil casing annulus, the flushing fluid enters the packer backwashing channel 28 through the outer liquid inlet hole 30 and the inner liquid inlet hole 29, the upper piston 22 and the lower piston 25 are pushed to move downwards, the spring 23 is compressed to be short, the upper piston 22 is separated from the lower rubber cylinder seat 19 and the sealing ring 20, the backwashing channel is opened, the upper layer and the lower layer are communicated, and the flushing fluid smoothly passes through the seated packer; when the backwashing well is finished and water is injected again, clean water pushes the upper piston 22 and the lower piston 25 to move upwards through the liquid outlet I2-4 and the liquid outlet II 24-1, meanwhile, the spring 23 is reset to extend, and the power-assisted backwashing channel is closed.
And 103, unsealing the packer, wherein the unsealing comprises one-time unsealing, two-time unsealing and pulling out the tubular column, as shown in FIG. 19.
in step 202, if the one-time decapsulation fails, then the two-time decapsulation is performed. As shown in fig. 11, fig. 13, fig. 4, fig. 5, fig. 9, fig. 10, if the shear pin 7 is sheared and unset due to sand blockage, rusting, etc., the packer still does not realize one-time unset, the pipe column is continuously lifted to drive the upper joint 1, the upper outer sleeve 4, the shear ring sleeve 6, the upper cylinder seat 13 to ascend, the shear ring 5 is sheared and continues to ascend, the end rubber cylinder 16 and the middle rubber cylinder 18 are axially released, radially recovered and axially extended to complete double unset (as shown in fig. 13), and the two-time unset is also independent, and meanwhile, the plug 2-1 of the central pipe 2 is disengaged from the slot 1-2 of the upper joint 1 to realize oil jacket communication and reduce pipe-lifting load; and continuously lifting the pipe column, unsealing the lower-level packer and pulling out the pipe column.
And 104, if the lower packer cannot be unpacked, releasing the packer. In practical applications, the lower stage packer may be any one of the following stages. As shown in fig. 11, 2, 4, 14, 15, if the lower packer cannot be unset due to sand jam, rust, etc., the upper tubular column is continuously lifted to drive the upper joint 1, the O-ring 3, the upper outer sleeve 4, the shear pin sleeve 6, the support sleeve 8, the lock ring 9, the lock sleeve 10, the shear pin seat 11, the upper tubular seat 13, the outer central tube 14, the protection bowl 15, the end rubber tube 16, the spacer ring 17, the middle rubber tube 18, the lower rubber tube seat 19, the seal ring 20, and the seal ring sleeve 21 to move upwards, and the central tube 2 moves downwards relatively; because the maximum diameter of the excircle 2-3 at the upper part of the central tube 2 is smaller than the minimum inner diameter of the shear pin seat 11 and the outer central tube 14 and is larger than the minimum inner diameter of the lower rubber cylinder seat 19, the central tube 2 can be clamped at the minimum inner diameter of the lower rubber cylinder seat 19 in the relative downward moving process, the tubular column is continuously lifted, the releasing section 19-1 is pulled off, releasing (as shown in figures 14 and 15) is realized, the upper tubular column is lifted out, the lower tubular column is salvaged, and overhaul operation is avoided.
The invention needs to be implemented by depending on a separate-layer water injection pipe column, and a technical scheme implementation process applying the invention is described below by taking three sections of water injection pipe columns as an example, as shown in fig. 20.
The separate zone water injection string comprises an oil pipe 31 as shown in figures 1, 2, 11, 12, 13, 14, 15 and 17, wherein the oil pipe is sequentially connected with an anchor 32, a first-stage independent de-injection packer 33-1, a second-stage independent de-injection packer 33-2, a third-stage independent de-injection packer 33-3, an eccentric water distributor 34, a fixed ball seat 35, a sieve pipe 36 and a plug 37 through threads.
and step 304, closing the water distributor and injecting a well flushing liquid to perform backwashing operation. As shown in figure 17, each layer of water distributors 34 is closed, well washing liquid is injected into the oil sleeve annulus, enters a backwashing channel of a first-stage independent deblocking water injection packer 33-1 and pushes away an outlet to flow out, then enters a backwashing channel of a second-stage independent deblocking water injection packer 33-2 and pushes away the outlet to flow out, then enters a backwashing channel of a third-stage independent deblocking water injection packer 33-3 and pushes away the outlet to flow out, and then enters a central pipe to return to a wellhead after pushing away a fixed ball seat through a sieve pipe.
And 305, opening the water distributors at all layers, and refilling water into the oil pipe. As shown in the figures 1 and 11, after the backwashing operation is finished, the water distributors 34 at all layers are opened, water is injected into the oil pipe again, the upper piston 22 and the lower piston 25 of each independent deblocking water injection packer 33 are pushed to move upwards, meanwhile, the spring 23 is extended and reset, the backwashing channel is closed, and water is injected normally.
And step 306, performing pipe lifting operation, including lifting the pipe column, lifting the pipe column and performing sectional fishing, as shown in fig. 21.
and step 402, if one packer cannot realize one-time unsealing, continuously lifting the pipe column to cut off a shear ring of the packer to realize double unsealing. The specific process is that if one-stage independent deblocking and water injection packer 33-1 (shown in figure 17) fails to realize one-stage deblocking due to sand blocking, rusting and the like, the pipe column is lifted continuously to cut off a shearing ring 5 (shown in figure 1) of the one-stage independent deblocking and water injection packer 33-1, the one-stage independent deblocking and water injection packer 33-1 realizes double deblocking (shown in figure 13), the pipe column is lifted continuously, one-stage independent deblocking and water injection packer 33-2 realizes one-stage deblocking (shown in figure 12), the pipe column is lifted continuously, one-stage independent deblocking and water injection packer 33-3 realizes one-stage deblocking and deblocking, and the pipe column is taken out; similarly, if the second-level and third-level independent deblocking water injection packers cannot realize one-level deblocking, the pipe column is continuously lifted to cut off the corresponding independent deblocking water injection packer shearing ring 5 (shown in figure 1), and the corresponding packers are deblocked in a double-level mode to be taken out of the pipe column;
and step 403, if the second-level packer cannot be unset, continuing to lift the tubular column upwards, and snapping the releasing section of the first-level packer to realize releasing, wherein the same principle is applied to the third-level packer. The specific process is that if the two-stage independent deblocking water injection packer 33-2 (shown in figure 17) cannot be deblocked due to sand blockage, rusting and the like, the pipe column is lifted continuously, the releasing section 19-1 (shown in figure 2) of the one-stage independent deblocking water injection packer 33-1 is broken, releasing is achieved, the upper pipe column (shown in figure 14) is lifted out, and then the lower pipe column (shown in figure 15) is salvaged. In a similar way, the third-stage independent deblocking water injection packer 33-3 is blocked, the second-stage independent deblocking water injection packer 33-2 is released, and then subsection salvage is carried out.
In the embodiment of the disclosure, by matching with the separate-zone water injection string, each packer has double deblocking functions, so that the deblocking success rate is improved; the combined sealing structure of steel body linear sealing and rubber interference extrusion is adopted, so that the backwashing channel has reliable sealing performance; the design of a combined structure of a pre-tightening spring and two-stage piston series connection is adopted to ensure that the backwashing channel is reliably closed; the device has the functions of independent unsealing and step-by-step unsealing, and the unsealing load is reduced; the oil jacket communication function is achieved, and the pipe lifting load is reduced; possess and meet and hinder the releasing function, improve the minor repair success rate, satisfy the pipe demand of layering water injection tubular column safety play, effectively reduce the operating cost. The invention has compact design structure, high temperature and pressure resistance index, low closing differential pressure of the backwashing channel, simple construction operation and wide application prospect, and is suitable for low-permeability block and deep inclined well separate injection process.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It should also be noted that, in this document, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, relational terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions or neither should the relative importance be understood or implied. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrases "comprising one of 8230 \8230;" does not exclude the presence of additional like elements in a process, method, article, or terminal device that comprises the element.
The technical solutions provided by the present application are described in detail above, and the principles and embodiments of the present application are described herein by using specific examples, which are only used to help understanding the present application, and the content of the present description should not be construed as limiting the present application. While various modifications of the illustrative embodiments and applications will be apparent to those skilled in the art based upon this disclosure, it is not necessary or necessary to exhaustively enumerate all embodiments, and all obvious variations and modifications can be resorted to, falling within the scope of the disclosure.
Claims (10)
1. An independent deblocking water injection packer is characterized by comprising a backwashing mechanism and a deblocking mechanism; the backwashing mechanism comprises a backwashing closing mechanism and a backwashing sealing mechanism; the backwashing closing mechanism adopts a combined structure design of a pre-tightening spring and two-stage pistons connected in series; the backwashing sealing mechanism adopts a combined structure design of steel body linear sealing and rubber interference extrusion sealing;
the backwashing mechanism is used for communicating an upper layer with a lower layer to realize backwashing and well washing, and comprises an upper joint (1), a central pipe (2), an outer central pipe (14), a lower rubber sleeve seat (19), a sealing ring (20), a sealing ring sleeve (21), an upper piston (22) and a spring (23); the outer central pipe (14) is sleeved outside the central pipe (2); the central pipe (2) is spliced with the upper connector (1), the upper part of the outer wall is provided with 1 annular groove, the middle part is provided with a large section of reducing diameter, an annular backwashing channel is formed with the inner wall of the outer central pipe (14), the lower end is provided with a liquid outlet I, and the central pipe is connected with the lower central pipe (24) through threads; the middle part of the lower rubber cylinder seat (19) is provided with internal threads which are connected with the outer central pipe (14), the lower end of the lower rubber cylinder seat is provided with a releasing section (19-1) and a sealing outer inclined plane (19-2) in sequence, and the lower end of the lower rubber cylinder seat is propped against an upper piston (22); the lower rubber cylinder seat (19) is connected with the sealing ring sleeve (21) through threads; the sealing ring (20) is arranged in an annular space formed by the lower rubber cylinder seat (19) and the sealing ring sleeve (21);
the deblocking mechanism is used for double independent deblocking and releasing after blockage, and comprises the central pipe (2), a shearing ring (5), a shearing nail sleeve (6), a deblocking shearing nail (7), the lower rubber cylinder seat (19), a support sleeve (8) and the outer central pipe (14); the deblocking shear pin (7) is used for being sheared when deblocking is carried out to finish double deblocking; the shear ring (5) is used for shearing to realize double deblocking when one-time deblocking is not realized when a block is encountered, and meanwhile, the plug of the central pipe (2) is separated from the slot of the upper joint (1) to realize oil sleeve communication; the lower rubber sleeve seat (19) is provided with a releasing section (19-1) which is used for breaking the releasing section (19-1) to realize releasing when a lower packer cannot be released; the shear rings (5) are two semicircular rings and are sleeved in the annular grooves of the central pipe (2); the shear pin sleeve (6) is in a stepped annular shape, and the lower end of the shear pin sleeve is circumferentially provided with through holes matched with the diameter and the number of the deblocking shear pins (7).
2. The packer of claim 1, wherein the backwash closing mechanism employs a combination of a pre-tightening spring and a two-stage piston in series, the combination comprising: the upper part of the upper piston (22) is provided with a sealing inner inclined plane (22-1), a sealing arc surface (22-2) and a sealing circular surface (22-3), an inner hole at the lower part is provided with a spring cavity which is sleeved on the outer wall of the central tube (2), the spring (23) is arranged in an annular space formed by the upper piston (22) and the central tube (2), and the lower end of the annular space is abutted against the lower piston (25); the lower piston (25) is in a concentric step cylinder shape, is sleeved on the outer wall of the lower central tube (24), and is sealed through an O-shaped sealing ring; the pre-tightening spring is the spring (23) arranged in the inner cavity of the upper piston (22); the upward thrust formed when the spring (23) is reset and extended can be adjusted by adjusting the screwing length of a connecting thread pair of the central tube (2) and the lower central tube (24); the two-stage pistons are respectively the upper piston (22) and the lower piston (25) and are used for enabling water to enter lower cavities of the upper piston (22) and the lower piston (25) to respectively form upward thrust when water is injected; the upward thrust formed when the spring (23) is reset and extended and the upward thrust formed when the upper piston (22) and the lower piston (25) are filled act together to close the backwashing channel.
3. The packer of claim 1, wherein the backwashing sealing mechanism adopts a combination structure of steel linear sealing and rubber interference extrusion sealing, which is as follows: the sealing ring (20) is arranged in an annular space formed by the lower rubber cylinder seat (19) and the sealing ring sleeve (21), and all generated contact surfaces are interference extrusion sealing; the sealing circular surface (22-3) of the upper piston (22) and the inner sealing surface I (20-2) of the sealing ring (20) are in interference extrusion sealing; the sealing arc surface II (22-2) of the upper piston (22) and the sealing inclined surface (20-1) of the sealing ring (20) are in end face extrusion sealing; the upper inclined plane (22-1) of the upper piston (22) and the lower inclined plane (19-2) of the lower rubber cylinder seat (19) are steel body line seals formed by different angles.
4. The packer with independent deblocking and water injection according to claim 1, characterized in that the upper joint (1) is in a stepped ring shape, the upper part of the hole wall is provided with an oil pipe internal thread for connecting an oil pipe, the middle part is symmetrically provided with 2 arc-shaped slots, the lower part of the hole wall is provided with 2 ring grooves for installing an O-shaped sealing ring, the end part is provided with a stop groove for accommodating the shear ring (5), and the lower part is connected with the upper outer sleeve (4) through a thread; the upper outer sleeve (4) is tubular, the upper part of the upper outer sleeve is provided with an internal thread which is connected with the upper joint (1), the middle upper part of the upper outer sleeve is provided with radial threaded holes matched with the deblocking shear pins (7) in number and used for installing the deblocking shear pins (7), the lower part of the upper outer sleeve is provided with an internal thread which is connected with an upper cylinder seat (13), and the middle lower part of the upper outer sleeve is provided with radial threaded holes used for installing setting shear pins (12) and long circular outer liquid inlet holes used for enabling well washing liquid to smoothly enter a backwashing channel; go up feed cylinder seat (13) and be the ladder cyclic annular, upper portion sets up the external screw thread for connect go up overcoat (4), the lower part hole with outer center tube (14) outer wall cooperation is sealed through O shape sealing washer.
5. An independent deblocking water injection packer as claimed in claim 3, characterized in that said spring (23) is a compression spring of corrosion resistant material.
6. An independent unsetting water injection packer according to claim 3, wherein the outer diameter of the sealing circular face (22-3) of the upper piston (22) is larger than the inner diameter of the inner sealing face I (20-2) of the sealing ring, forming a radial squeeze seal by interference fit; the sealing arc surface II (22-2) of the upper piston (22) props against the sealing inclined surface of the sealing ring (20) under the action of the backwashing channel closing power to form end surface extrusion sealing; the sealing inner inclined plane (22-1) of the upper piston (22) props against the sealing outer inclined plane (19-2) of the lower rubber cylinder seat (19) under the action of the closing power of the backwashing channel to form steel line sealing.
7. The packer of claim 6, wherein the outer diameter of the inner sealing chamfer (22-1) is greater than the outer diameter of the outer sealing chamfer (19-2); the acute angle between the sealing inner inclined plane (22-1) and the central line of the independent deblocking and water injection packer is larger than the acute angle between the sealing outer inclined plane (19-2) and the central line of the independent deblocking and water injection packer.
8. An independent deblocking water injection packer according to claim 1, characterized in that the upper portion of the central pipe (2) is plugged into the upper joint (1), and the lower portion of the central pipe is concentrically connected with the lower central pipe (24) and the lower joint (26) through threads in sequence to form an inner cylinder; the periphery is concentrically provided with the deblocking mechanism, the locking mechanism, the sealing mechanism, the backwashing mechanism, the setting mechanism and the anti-setting mechanism.
9. An independent deblocking water injection packer according to claim 1, characterized in that the inner hole of the central pipe (2) is a through hole, and 2 arc plugs are arranged at the upper end and inserted into 2 arc slots of the upper joint (1).
10. An individual unsetting water injection packer according to claim 1, characterised in that the maximum diameter of the outer circle (2-3) of the upper part of the centre tube (2) is smaller than the inner diameter of the shear block (11) and the outer centre tube (14) and larger than the minimum inner diameter of the lower rubber sleeve block (19) for the centre tube (2) to get stuck at the minimum inner diameter of the lower rubber sleeve block (19) during relative downward movement.
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| CN115704282B (en) | 2024-07-12 |
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