FR2515724A1 - HYDRAULIC BLOCKING WELL SEAL TRIM - Google Patents

Abstract

WATERPROOFING WITH HYDRAULIC LOCKING AND SHEAR RELEASE BY VERTICAL TRACTION, TRANSMITTING TORQUE BEFORE LOCKING AND AFTER RELEASING. THE SEAL INCLUDES A FIRST AND A SECOND PISTON 26 AND 30, ONE OF WHICH BLOCKS THE RETAINING CORNERS 18 AND THE OTHER BLOCKS THE SEALING ELEMENTS WITHOUT MOVEMENT OF THE PADDLE. THE CORNERS PREFERABLY INCLUDE SEVERAL SETS OF RETAINING RINGS 58 AND TAPERED RINGS 60, OPPOSED AND OVERLAPPING TO REDUCE THE LOCKING STROKE, THE RETAINING RINGS OF A GROUP OF SETS BEING AVAILABLE ABOVE AND THOSE OF THE OTHER SETS AT - BELOW CONE SEGMENTS; THE LOWER SEGMENTS ARE FIXED ON CHUCK 14 AND THE UPPER SEGMENTS ACTUATED BY A PISTON. AN INTERMEDIATE FUR MAKES A PERMANENT, RECOVERABLE TRIM, WHICH SUPPORTS TENSION AND COMPRESSION WITHOUT RELEASING. APPLICATION: WELL SEAL.

Description

The present invention relates to a well seal

  hydraulically actuated and released by upward vertical pulling, as described in U.S. Patent 4,141,413. It relates to an improved, economical, hydraulically with vertical shear stall Trim

  seal transmits the torque of the production tube before the

  cage and after release, and any torque applied before blocking

  does not affect the blocking or release mechanism.

  locking mechanism comprises two pistons, one for locking the retaining wedges and one for locking the sealing element, all these

  which can be carried out without moving the production tube

  An improved restraint system is provided to reduce the

  blocking stroke as well as the length of the packing.

  An intermediate pound makes it possible to convert the seal of

  a permanent, recoverable lining that resists both tension and compression without affecting the stall mechanism. Additionally, an internal expansion joint can be connected to the seal by a stall mechanism.

hydraulic without shear.

  The subject of the invention is a seal - of a blocking well

  hydraulic system, comprising a tubular mandrel with a means of con-

  at the lower end Expansible and retractable retaining wedges are provided on the lower end of the mandrel,

  and expansible and retractable seals of the sealant

  are placed on the mandrel above the retaining wedges.

  A hydraulic cylinder is arranged on the mandrel, between the retaining wedges and the seals, a hydraulic lumen of the mandrel communicating with the inside of the cylinder. The first and the second piston are arranged in the cylinder, on two sides. opposite of the light, the first piston coming into contact with the corners of

  and the second piston with the seals of the seal

  the plunging of the pistons by a flow of fluid through the lumen produces expansion of the retaining wedges and packing seals. One of the pistons is connected to the cylinder and a single-acting fastener, a pawl for example, is provided between the cylinder and the second piston to maintain the retaining wedges and the seals of the seal in the extended position A higher reduction is provided with connecting means; it is telescopically connected to the

  upper part of the mandrel with keys transmitting rota-

  between the reduction and the mandrel A locking cage is arranged on the mandrel and comes into contact with the gaskets of the packer, and a shear-off device is connected between the standoff and the reduction for the stall of the

  seal by a vertical upward pull exerting

on the reduction.

  The invention also relates to an improved retaining wedge comprising a plurality of opposing and overlapping sets of retaining segments and conical segments, the retaining segments being disposed above the conical segments in a set of games and below. conical segments in other games The lower conical and retainer segments are attached to the mandrel, while the upper conical and retaining segments engage the first piston, so that the retaining wedges can be actuated with reduced stroke, thus decreasing the length

  required of the packing.

  The invention also relates to a single-acting fastening device, such as a pawl disposed between the second piston and the mandrel to prevent the locking of the retaining wedges after the

  stalling of the seal.

  The invention also relates to a single-action pawl disposed between the upper reduction and the mandrel to allow upward movement of the reduction relative to the mandrel, while transmitting the downward movement of the mandrel after the stall of the shearing devices. , to help stall corners

restraint where applicable.

  The invention also relates to an intermediate fur connected to the stop cage and having means for connecting to a channel, so that the seal can withstand the

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compression without getting stuck.

  The invention also relates to an expansion joint, extending through the seal and having a locking cavity. A hydraulic lock is connected to the mandrel and surrounds the expansion joint. The lock comprises expandable and retractable stops. whose initial expansion in the cavity of the expansion joint locks the latter on the seal, but which are detachable by the hydraulic fluid. Other features and advantages of the invention will be

  better understood using the detailed description below of a

  preferred embodiment and accompanying drawings on the

what:

  FIGS. 1A and 1B are partial elevations, in the extension

  one of the other, the seal according to the invention, shown in the operating position and in partial section; Figures 2A and 2B are partial elevations in section, in the extension of one another, of the seal according to the invention, shown in the locking position; Figures 3A and 3B are partial elevations in section, in the extension of one another, of the seal according to the invention, shown in the stall position;

  FIG. 4 is a partial elevation in partial section, representing

  as an intermediate fur for connection to the seal according to the invention, to convert it into a permanent recoverable liner; Figure 5 is a partial sectional elevation of a type of connector used with the intermediate fur according to Figure 4; Figure 6 is a partial sectional elevation of another type of connection usable with the intermediate fur according to Figure 4; and FIGS. 7A, 7B, 7C, 7D and 7E are partial elevations, in

  partial section, in the extension of one another, of the

  sealant according to the invention, used with an intermediate fur an expansion joint, in the form of a permanent seal recoverable with an expansion joint

internally connected.

  In FIGS. 1A, 1B, 2A, 2B, 3A and 3B, the seal of

  10 according to the invention is used in blocking in the casing

12 of a well.

  In FIG. 1B, the seal 10 comprises a tubular mandrel 14 provided at its lower end with a means of

  connection such as a thread 16 Retaining wedges 18, extending

  Sealing and retractable seals 20 are arranged on the lower end of the mandrel 14 Expansible and retractable seals 20 are disposed on the mandrel 14 above the retaining wedges 18 A hydraulic cylinder 22 is disposed on the mandrel 14, between the retaining wedges 18 and the seals 20 of the seal A light 24 of hydraulic fluid is provided in the

  mandrel 14 and communicates with the interior of the cylinder 22 -

  A first piston 26, formed by seals 28, is disposed in the cylinder 22, on one side of the slot 24, and comes into contact with the retaining wedges 18. A second piston 30, formed by seals 32, is arranged The circulation of a suitable hydraulic fluid in the lumen 24 pushes the pistons 26 and 30 away from each other as if they were in contact with the packing seals. shows particularly in Figure 2 B, for the expansion of the retaining wedges 22 and seals 20 of the seal, which come into contact with the casing 12 One of the pistons, the piston 26 for example, is connected to the cylinder 22 by a thread 34 and a single-acting fastening device, such as a pawl 36 loaded by a spring (Figure 1 A) is disposed between the

  cylinder 22 and the second piston, the piston 30 for example, for

  holding the retaining wedges 18 and the seals 20 of the liner in the locking position The retaining wedges 18 and the seals 20 of the lining are preferably maintained initially in the operating position or retracted by a shear pin 38, which is sheared by maneuvering

pistons 26 and 30.

  In FIGS. 1A, 2A and 3A, an upper reduction 40 is provided with a connection means, such as a thread 42, and connected

  telescopically at the upper end of the mandrel 14

  43 and a groove 44 are provided between the reduction 40 and the mandrel 14 to transmit the torque of the production tube through the seal 10, before the blocking and after the stall A stop cage 46 is disposed on the sleeve 14, engages the upper end of the seals 20 of the liner, and covers the reduction 40 by surrounding it. One or more unhooking devices, such as shear pins 48, are planned for the stall of

  the seal by an upward pull on the reduction

  40, after blocking the seal.

  In FIG. 1B, a single-acting fastening device, such as a pawl 50, is disposed between the second piston 30 and the mandrel 14 to prevent the locking of the retaining wedges 18 after the stall of the seal , in a manner to be described in more detail later In FIG. 1A, a single-effect fastening device, such as a pawl 52, has a bevel 54 which interacts with a bevel 56 of the upper reduction 40 to transmit downward movement to the mandrel 15, after release of the shear pin 48, to assist in unhooking the retaining wedges 18 as appropriate The pawl 52 is initially held in position by the bevel 56 of the upper reduction 40, in order to of

  hold the stop cage 46 during the blockage of the water

fairness 10.

  In FIGS. 1B, 2B and 3B, the retaining wedges 18 are preferably constituted by several sets of retaining and conical segments, opposite and overlapping. A set of games comprises

  retaining segments 58 overlapping and arranged above the segments

  conical elements 60 with which they interact, while other games include overlapping segments 58 overlapping and arranged

  below the conical segments 60 with which they interact.

  Retaining segments 58 and lower conical segments 60 are

  fixed on the mandrel 14 by an intermediate fur 62; the segments

  retainers 58 and the upper conical segments 60 come into contact with the first piston 26 By connecting one end of a

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  set of wedges and chucks to the chuck and actuating the second end

  In this game, the cause of blocking of the retaining wedges 18 is halved compared with the case where the retaining mechanism moves relative to a movable seal. The retaining wedges 18 preferably have a holding capacity. bidirectional

  charge and are arranged between the seals 20 of the

  to remove fouling from well debris. The seals 20, as shown in particular in FIGS. 1A, 2A and 3B, may be of any suitable type but preferably comprise three distinct sealing elements 64, 66 and 68, separated by rings. spacer 70; the sealing elements 64 and 68 are made of a harder material in order to reinforce the more flexible interior element 66 to avoid a

extrusion failure.

  In use, the seal 10 is in the operating position, in which it is connected to a train (not shown) and lowered into the casing 12 to the position where it must be blocked, as shown. especially FIGS.

  and 1 B Hydraulic fluid is transmitted to the interior 11 of the

  10 and in the light 24 to actuate the pis-

  26 and 30 The operation of the pistons 26 and 30 shears the pin 38 and the spacing of the pistons 26 and 30 blocks the retaining wedges 18 and the seal 28 of the seal in the locking position, as shown in particular FIGS. 2A and 2B It should be noted that the blocking occurs without displacement of the mandrel 14 or

  of the train, which allows the introduction of several

  The single-action pawl 36 holds the cylinder 22 with respect to the piston 30 to hold the retaining wedges 18 and the seals 20 of the lining in the locking position to unhook the seal. 10, an upward pull is exerted on the upper reduction 40, as shown in particular in Figures 3 A and 3 B, so that the stall pin 48 is sheared and a shoulder 72 deala

  reduction 40 comes into contact with a shoulder 74 of the cage of

  46, in order to move the latter upwards by allowing the retraction of the seal 20, the continuation of the movement

  ascending the piston 30 and retracting the retaining wedges 18.

  When the bevel 56 of the upper reduction 40 moves upwards, the pawl 52 is thus released and driven by the stop cage 46 upwards, with respect to the mandrel 14 Si for a reason

  any of the retaining wedges 18 did not retract properly

  Alternatively, a downward movement can be made on the upper reduction 40 to bring the bevel 52 into contact with the pawl 52, now positioned at the top, and to drive the mandrel 14 downwards, to drive the intermediate fur 62 from the corners and the 6 nes

  lower down and better unhook the wedges 18.

  It should also be noted that the single acting 50 ratchet

  said a descent of the second piston 30 relative to the mandrel 14 after the stall of the seal, to prevent accidental expansion of the wedges 18 After the stall of the seal 10, a couple can be applied to the

  upper reduction 40, the key 42 and the groove 44, by the

intermediate of the mandrel 14 -

  The constitution and operation described above of the

  packings 10 provide a hydraulic lock seal

  However, it may be desirable in some cases to have a seal which supports both a tension and a compression of the train, without affecting the stall mechanism on the rail. Figure 4, the gasket 1 Oa is identical to the gasket shown in Figures 1 and 2; an intermediate fur 80 is connected to the stop cage 46 by a suitable thread 82, for example the intermediate fur also comprises appropriate connecting means, such as a thread 84, if appropriate, and the connecting means 42 a of the

  Upper reduction 40 may be of a different type of thread.

  The blocking of the seal 10 a is identical to that of

  the seal 10 The stall of the seal

  This is done by coupling the thread 42a to move the upper reduction 40 upwards with respect to the intermediate fur 80, in order to shear the pins 48 and unhook the seal 10a. form of a permanent seal, only the thread 84 is however

  coupled with the oar and no tension or compression in this

  and the intermediate fur 80 does not shear the pins 48.

  In other words, upward traction on the intermediate fur

  80 does not produce any relative movement between this latter and the upper reduction 40, because an upward traction on the stopper 46 is transmitted to the mandrel 14 by the pawl 52 which is locked in position by the bevel 56 of the upper reduction Any compression of the ream and the intermediate fur 80 is supported by the expanded retaining wedges 18, as in the case

of the seal 10.

  Although any type of stem connection with intermediate fur

  80 may be suitable, the conventional coupling variants of

  connection of the train to the seal 1 Qa are used

  Fig. 5 shows a connector 86 with a means such as a ream connection thread 88, and a conjugate thread 90 of the thread 84 of the intermediate fur 80. The threads 84 and 90 may be of the pull-up stall type. vertical, that is to say the stall type by rotation to the right The connection 86 comprises a

  seal 92 sealing against the interior of the furnace

  FIG. 6 shows another type of connection.

  cord 94 comprising a seal 96 and stall type

by vertical lift.

  The seal 10 according to FIGS. 1 and 2 may also be

  carry options converting it into a permanently

  rable, including an internal expansion joint connected to the

  by a non-shearable device such as a hydraulic lock

  FIGS. 7A, 7B, 7C, 7D and 7E show such a packing.

  The sealing l Ob is substantially

  identical to the linings 10 and 1 Oa; it includes a fur

  80 b mediator connected to the stop cage 46 b for connection to a

  ream, the lining 10b supporting both a tension and a compres-

  without affecting the stall pins 48b, which convert it into a permanently recoverable lining A sealing burr extension 100b, having a recovery reduction and a safety seal, is connected to the intermediate fur 80b An internal expansion joint 100 extends into the lining 10b and seals with respect to the interior

the bore of the latter.

  It is desirable to connect the expansion joint 100 to

  the seal 10b, with the possibility of simul-

  in the well, but a shear connection should be avoided

  lable between the seal 100 and the seal 10 b because it

  risk of being sheared inadvertently.

  FIG. 7E represents a hydraulic lock 102, which comprises connection means such as a thread 104 for

  fastening to the threading 16b of the mandrel 14b of the sealing gasket

  10b, as well as a connection means such as a thread 106

  for connection to another channel The lock 102 includes several

  108 stops, represented in the expansion position for

  engagement in a cavity 110 of the expansion joint 100, so as to

  the initial locking of the expansion joint 100 on the

  The lock 102 comprises a piston 112 formed by seals 114, as well as a bevel 116 which interacts with

  a bevel 118 of the stops 108 A shear pin 120 hand-

  initially holds the piston 112 in position on the stops 118 for connecting the seal 100 to the seal 1 ob A light 122 of the seal 100 transmits the hydraulic fluid to the piston

  112 for shearing the pin 120 and releasing the stops 108,

  thus disconnecting the gasket 100 from the gasket

fairness 1 Ob.

  In use, the seal 10 b according to Figure 7 is connected to the expansion joint 100 by the stops 108 of the hydraulic lock 102, and the seal 100 and the seal 10 b are introduced simultaneously into the casing 12 The seal 10 b is blocked by a hydraulic pressure which is transmitted by the light 24 b and moves the pistons 26 b and 30 b to block the retaining wedges 18 b and the seals 20 b of the lining A new pressure transmitted by the light 122 actuates the piston 112 of the lock 102 to release the expansion joint 100 of the seal 1 Ob The seal 100 is fully recoverable without raising the seal 10 b, which is permanent type recoverable and is unhooked by a tool causing a movement of the upper reduction 40b relative to the intermediate fur 80b Moreover, a tension or a compression exerted on the intermediate fur 80b or the

  extension 100 b does not affect the stall of the water

fairness 1 Ob.

  Of course, various modifications may be made by those skilled in the art to the principle and to the devices which have just been described solely by way of nonlimiting examples, without

depart from the scope of the invention.

Claims (7)

claims   Hydraulically lockable well seal, characterized by: a tubular mandrel having a connecting device at the lower end; expandable and retractable retaining wedges disposed at the lower end of the mandrel;   seal seals, expandable and retractable   tables, arranged on the mandrel, above the retaining corners; a hydraulic cylinder disposed on the mandrel, between the retaining wedges and the packing seals; a hydraulic lumen of the mandrel communicating with the interior of the cylinder; a first and a second piston disposed in the cylinder, on either side of the light, the first piston coming into contact with the retaining wedges and the second piston with the seals of the lining, so that the spacing   pistons by a fluid flow through the light produced the ex-   expansion of the retaining corners and packing seals; one of said pistons being connected to the cylinder and a single-acting fastener being disposed between the cylinder and the second piston to maintain the retaining wedges and the packing seals in the expansion position; an upper reduction comprising a connecting device and telescopically connected to the upper end of the mandrel; a keying device between the reduction and the mandrel for the transmission of rotation between these two parts; a stopper disposed on the mandrel and contacting the seal seals; and a stall shearing device, connected between the stopping device and the reduction to unhook the trim   sealing by vertical pull on the reduction.   Sealing arrangement according to claim 1, characterized in that the retaining wedges comprise a plurality of opposing and overlapping retaining segments and conical segments, one of which is fixed on the mandrel and the other comes into contact with the first piston for   reduce the amount of travel necessary to block the wedges.   Seal according to claim 1, characterized in that the retaining wedges comprise a plurality of opposing and overlapping sets of retaining segments and conical segments. retaining segments of a game group being arranged above   conical segments and those of the other games being arranged   below the conical segments; and restraint segments and seg-   tapered cones are attached to the mandrel, while the   retaining segments and upper conical segments come into con- tact with the first piston -   Seal according to claim 1, characterized by a single-acting fastening device disposed between the second piston and the mandrel to prevent blocking of the retaining wedges.   after stalling the packing.   A seal according to claim 1, characterized by a single-action pawl disposed between the upper reduction and the mandrel to allow upward movement of the reduction relative to the mandrel, while transmitting the downward movement to the mandrel.   mandrel after the stall of the shearing means, so as to assist   the stalling of the wedges.   6 seal according to claim 1, characterized in that the reduction initially abuts with the stop device to maintain the latter during the locking of the seal sealing.   Sealing arrangement according to claim 1, characterized by   an intermediate fur connected to the stop device and comprising   one channel connection device, the water   which can thus withstand tension and compression without stall.   8 seal according to claim 7, characterized by   an expansion joint extending through the gasket and presenting   both a locking cavity; and a hydraulic latch connected to the mandrel, surrounding the expansion joint and comprising expandable and retractable stops, which initially lodge in the cavity of the expansion joint to lock the latter on the   seal but can be released by maneuvering.