DE1242170B - Pullable well packer - Google Patents

Description

YOUTH REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

E21b

Int. Cl .:

German class:

Number: 1 242 170

File number: B 82845 VI a / 5 a

Filing date: July 15, 1965

Open date: June 15, 1967

The invention relates to a pullable borehole packer which is suspended from a rope or a rod can be installed in the borehole, and is based on a known borehole packer, consisting of an elongated control rod extending through a tubular outer body, one valve assembly controlling fluid passage in both directions through the outer body, which be ίο during a relative longitudinal movement between the outer body and the control rod is operable, a sealing device arranged on the outer body and acting on the borehole wall to prevent the passage of fluid along the outside of the outer body, one axially slidable on the outer body Friction device, which is radially expandable connected to a slip device, which at relative displacement of the outer body with respect to the friction device and the slip device with a cone fixed to the outer body for anchoring to the tubular wall is expandable.

In this known well packer, the friction device is arranged under the slip device and accordingly enters the wellbore prior to the slip assembly when the packer is installed a, wherein the designed as leaf springs friction elements as guides for the borehole packer serve and are prevented by a locking device, and thus also the slip device relative to the outer body to prevent premature setting of the packer. This locking device includes a ball lock, which is in the connection of the packer with a setting tool is provided, and on the other hand a ball lock at the upper end of the setting tool. When the locking device is to be released, the rope on which the packer is using is used the setting device is suspended, a weight is dropped, which the upper ball lock on impact solves. A spring pushes the cylinder holding the lower ball lock in engagement upward, whereby the lower ball lock is also released, so that the friction device is now effective can be. The packer seal and slip device are only effective in one direction and settable and are brought into engagement by an overpressure prevailing above the packer, by pushing the outer body downward while the friction device is on the borehole wall engages and the slip device in a relative movement with respect to the casing Pullable well packer

Applicant:

Byron Jackson Inc.,

Long Beach, Calif. (V. St. A.)

Representative:

Dr.-Ing. H. Negendank, patent attorney,

Hamburg 36, Neuer Wall 41

Named as inventor:

LyIe B. Scott,

Long Beach, Calif. (V. St. A.)

Claimed priority:
V. St. ν. America August 28, 1964
(392 832)

of the borehole. The valve assembly consists of a piston, which by the weight of one with it connected body is moved axially with respect to the outer body and into the bore of the latter occurs when the lock between the setting tool and the packer is released, which also caused by the falling weight.

Furthermore, a packer is known which does not require a separate setting tool, but instead requires ignition a mass is set, the gases of which cause a high pressure, which by means of a cylinder and piston in relative movement between an expansion cone and a slip device and a packer seal is implemented. This packer cannot be released and pulled, but must be drilled out. It therefore falls under a different type of packer than the subject of the invention.

With the invention, a borehole packer of the above type is to be created, which for setting no special Setting tool required, which is effective in both directions when pressurized and the has a lock between the friction device and the outer body, which is only then automatic is released when the friction device is inserted into a casing corresponding to the packer size

709 590/50

of the wellbore occurs after the slip device has previously entered the casing is. Furthermore, the packer should be designed so that a trial setting of the same can be carried out to the To indicate to the operating team that the packer can finally be set.

This object is achieved according to the invention in that the friction device between the arranged above the sealing device and the slip device arranged below and by allowing the control rod to idle upward relative to the outer body Slip connection is connected to the lower end of the control rod, while its upper End is firmly connected to a fishing head, which is opposite the outer body usually a assumes the first position, but in a raised position against the outer body against the force a torque-exerting device rotatable in a second angular position and to Carrying out a trial setting of the packer can be lowered to a limited extent.

According to the invention, a locking device is provided which the friction device releasably with the connects outer body and has spring-loaded pawl levers that lock one on the outer Grip under the shoulder provided for the body and move into the release position by touching the wall of the borehole are pivotable.

A preferred embodiment provides that the friction device is axially slidable on the having outer body arranged cage, which is arranged in longitudinally extending slots, Friction pieces pushed radially outwards by springs and two diametrically between the friction pieces has pivotably arranged ratchet levers, one lever arm of which by springs radially outward is pressed while the other lever arm each reaches through an opening of the cage to the outer Body intended shoulder to reach under locking.

In order to achieve a secure wedging of the packer in both directions, the invention provides that the slip device upper and lower axially spaced apart by connecting rods having rigidly interconnected slip slips provided by an on the outer body Double cone for both an upward and a downward axial movement of the outer Body can be expanded with respect to the friction device. The upper ends are useful here the slips are hinged to the lower arms of pivot links attached to the cage of the friction device are pivotably mounted on pivot pins and by springs acting on the upper arms are pressed into contact with the outer body, each with a lower stop surface of the Pivot links engages the head of the upper slip to allow relative outward pivoting of the to prevent wedges lying on the outer body.

To achieve an effective seal in both directions, the invention provides that the sealing device has two cuff-shaped packer seals arranged opposite one another on a holder forming a portion of the outer body, and that the ends of the holder are designed as valve seats for valve bodies slidingly arranged on the control rod are, which are constantly pressed in the closing direction by springs, but can be lifted from their seats by shoulders provided on the control rod.
According to the invention, the slip connection has a cross head connected to the cage of the friction connection, which cross head penetrates diametrically opposite elongated holes in the outer body and in a connector head arranged at the lower end of the control rod.

An embodiment of the subject invention now to be described is shown in the drawings. Show it

F i g. 1 and 1 - longitudinal sections through the upper and lower part of a packer during installation in a Drilling,

F i g. 2 and 2a a packer of FIG. 1 and 1 a in the set state, in which he pressure from above receives,

ac F i g. 3 shows a partial longitudinal section along line 3-3 of Fig. la,

F i g. 4 a section along the line 4-4 of Fig. La,

F i g. 5 shows a partial longitudinal section through the friction device along the line 5-5 in FIG. 4,

F i g. 6 shows a section along line 6-6 in FIG. 1 a and

F i g. 7 is a representation similar to FIG. 3, which shows the parts in the relationship they are in use of the packer according to fig. Take 2 and 2 a.

The F i g. 1 and 1a show that the pullable well packer according to the invention is an elongated one Control rod 1, which is screwed into the upper catch head 3 with thread 2. The control rod 1 penetrates an outer tubular body, designated as a whole by 4, on which with axial distance one above the other an anchoring device 5, a friction device 6 and the actual sealing device 7 are arranged.

At the lower end of the outer body 4 there is a terminating piece 8 which is fastened in the open lower end of the outer body 4. The outer tubular body 4 consists of a lower tubular body 9, in the lower end of which the terminating piece is screwed and on the upper end region of which a cage 10 is slidably arranged, through the central bore 11 of which the body 9 extends. The cage 10 is provided with a plurality of longitudinally extending radial slots 12 which receive an equal number of radially displaceable friction pieces 13 which each have outer friction surfaces 14 which can interact with the well casing. The friction pieces 13 are urged by springs so that they come into frictional engagement with the tubing; In the example shown, the springs consist of a plurality of helical springs 15 which act outwardly on the friction pieces and sit on the bottom of the slots 12 receiving the friction pieces. The upward movement of the friction pieces 13 is limited by retaining rings 16 and 17 which are arranged at the upper and lower ends of the cage and fastened by screws 18 and 19, respectively.

The cage 10 is at its lower end at various points in the circumferential distance with after Slits 20 open at the bottom are provided in which a plurality of links 22 are mounted by pivot pins 21 whose upper ends each have a tongue 23 with a

5 6

Helical compression spring 24 for cooperation by a between the lever 43 and the

comes, the helical compression spring 45 effective in an opening bottom of the groove 42 formed in the cage 10

tion 25 against an extension 26 of the same to limit caused force. At the other end

sits down. of the ratchet lever 40 is a ratchet arm

The lower ends of the links 22 are secured by pins 5 46 with a claw 47 which is inserted into a tubular

27 grasp at the cooperating with the bore wall gene body 4 formed annular groove 48

Anchoring device 5 rotatably mounted, and it can, which forms a latching shoulder 49, so that

it should be noted in particular that each of the links the pawl 47 under the tension of the spring 45 the

22 touches with an intercepting shoulder 49 designated as a whole by 28 and a movement of the body 4

wedge device is connected, which prevents from a circle io through the cage 10 and consequently the

A head 29 formed in the form of a segment-shaped part with an arcuate radial extension of the slipping wedge device 28

shaped toothed slip wedges 30, one from circular through the cone 37 prevents until the ratchet lever

Segments formed foot 32 with also arc 40 is triggered. As from the following description

shaped toothed slip pads 33 and with the exercise becomes clearer, the triggering of the

Circular segments of the head 29 and the foot 32 15 ratchet lever 40 performed as soon as the actuating

connecting rods connected by welding link arms 43 in a casing for engagement

31, which come in the longitudinal direction of the outer in which the tool is to be set,

tubular body 4 extend, whereby the ab- but gravitational forces are not effective to a

to cause slipping wedges 30 and 33 to form a wreath when the

are added and as a unit around the pins 27 of the 20 settling movement of the tool to a standstill

corresponding members 22 are movable. comes.

It should be noted that the action of the screw body 9 of the body 4 acting on the upper end of the lower tubular tongue 23 of the links 22, for example by means of a spring 24, consists in holding the lower ends of the screw threads 49 α with to pivot the bottom part 50 of a valve housing 22 inwardly, so that the 25 ses 51 are connected. The bottom part 50 has at its head 29 on the outer, tubular body 4 to the upper end a cup-like body 52 which comes into contact, and the lower ones are also widened outwards and dot several circumferential ends of the members 22 with stop surfaces 34 is provided with longitudinal slots 53 to see where the heads 29 abut to form a relative flow channel. On the cup-like tive upward pivoting of the assembled 30 bodies 52 is a tubular holder 55 for the slips to prevent the pivot pins 27, screwed packer seals with thread 54 or while the links 22 are otherwise designed with a beveled part of the same on surface 25 which is connected to an outward, upper end of which, for example, by pivoting the links 22 with a corresponding outward draft 56 or the like, a reversed cup-like body movement of the slip device 28 by 57, which several on the Umtet. The lower ends of the slips will have nor- mally distributed slots 58 which form flow channels through a spring ring or an O-ring, which pass through the holder 55 with the

36 made of rubber that connects the foot 32 of the slip slits 53. This cup direction 28 with the sections 33 comprises, in narrower-like body 57 is at the lower end of one Attached to the outer body 4, around the valve housing 59, which extends upwardly, catching wedges 30, 33 in the FIG. 1 forms shown.

hung to hold. Around the holder 55 are two entin each other the center between the upper and lower opposed packer seals 61 and 62. Slips 30 and 33 is a double cone body. Packer seal 61 has a lip portion

37 attached to the outer tubular body 4 45 63 which forms itself for cooperation with the drilling or formed as part of it, which wall of the hole extends upwards, while the packer is opposite inclined conical surfaces 38 and 39 seal 62 has a lip 64 which corresponds to of which the conical surface 38 extends with the chend downward; lips 63 and 64 upper slip 30 and conical surface 39 are near slots 53 and 58 of the cooperate with the lower slip wedges 33, 50 cup-like bodies 52 and 57 at a distance Keep the corresponding slips in suspension. The packer seal 61 lies with its inaccessibility from the relative longitudinal movement of the pipe end on a retaining ring 65, which around the shaped body 4 is arranged in one direction or the other holder 55, and the packer seal 62 are expanded radially through the cage 10 also lies with its upper end on one so that it is connected to the wall of the borehole in a locking ring 66, the ring 65 engaging at its lower anchorage: come, wherein the friction pieces 13 Ren edge has a seat 67 that is like one the movement of the slips along with seat 68 in retaining ring 66 to cooperate with Oppose cone 37 resistance. a slotted spring ring 69 is opposite which

As best shown in FIG. 5 it can be seen loading into an annular groove 70 which extends around the holder

the friction device sits a lock. At 60 55 extends around is inserted. This spring ring

In the embodiment, this consists of two pawls 69 holds the packer seals 61, 62 opposite one

levers 40, which are fixed on pins 41 in two diametrically opposite longitudinal movements on the holder 55,

overlying slots formed in the cage 10. Seals are also provided to protect the

42 are rotatably mounted. The pawl levers 40 have leakage of fluid between the packer

to prevent actuation 65 seals 61, 62 and their holder 55 on one side of the pin 41

arm 43 on, which is in the longitudinal direction of the cage. These seals consist of two O-rings

10 extends, and at the outer end a tongue 44, 72 and 73, which in outer annular grooves of the holder 55

possesses, which can reach under the retaining ring 16 to be arranged and with the inner circumference of the Ab-

Stand rings 65 and 66 come together.

The elongated control rod 1 extends through the outer tubular body 4 in the longitudinal direction. This control rod is used for installing and setting, as well as for releasing and pulling the packer. The upper section of the control rod 1 extends through the valve body 59 of the outer body 4, the holder 55 and at the bottom part 50 of the cup-like body 52 into the lower body 9.

On the control rod 1 in the cup-like body 52 of the outer tubular body 4 is a Valve head 80 slidably mounted normally by a coil spring 81 in the direction of the valve seat provided at the lower end of the holder 55 is urged upwards. By doing Cup-like body 57 of the outer tubular body 4 is a valve head on the control rod 1 83 slidably disposed, normally by a coil spring 84 towards one on the upper end of the holder 55 formed seat 85 is urged downward. The valve head 80 can through a flange 86 formed on the control rod 1 down from its seat and the Valve head 83 is moved upward from its seat by a flange 87 formed on the control rod 1 will. The distance between the flanges 86 and 87 in the longitudinal direction of the control rod 1 is such that when moving the same in the longitudinal direction, one of the valve heads is moved away from its seat and the other valve head is pressed onto its seat. Therefore, the connection through the holder 55 is between slots 53 and 58; d. H. the bypassing of the packer seals 61, 62, through the valve heads 80 and 83 are controlled as a function of the setting of the control rod 1 within the outer body 4.

As best shown in FIG. 3, the control rod 1 has a connector head at its lower end 90, which is provided with an elongated hole 91. Through the elongated hole 91 extends in In the transverse direction, a cross head 92, the elongated holes 93 also arranged diametrically in the body 9 is penetrated and connected to the cage 10. There is therefore a slip connection between the Control rod 1 and the cage 10, which allows an upward movement of the control rod 1, which is sufficient that the upper valve actuation flange 87 engages the upper valve head 83 and removes it from its seat, without affecting the relative position between the lower body 9 of the outer tubular body 4 and the cage 10 in the longitudinal direction.

The downward movement of the control rod 1 within the outer tubular body 4 is through prevents the stop of the catch head 3 at the upper end of the valve housing 59 when the catch head 3 and the valve housing 59 assume a certain angular position to one another. More precisely is with reference to FIG. 1 to point out that in the upper end of the valve housing 59 two axially extending slots 95 are provided, while the catch head has 3 fingers 96, which extend into the slots 95. Between the fingers 96 is the catch head with a Stop surface 97 is provided, which extends around the circumference on both sides of the fingers 16 and with the end face 98 of the valve housing 59 comes to cooperation. The distance from the stop surface 97 to the upper end of the elongated hole 91 in the connector head 90 determines the relative position between the lower body 9 of the outer tubular body 4 and the cage 10 in the longitudinal direction and thus determines the relative position between the stop surface 34 and the slips 30 and 33 the slip device 28 in the longitudinal direction.

If, therefore, as shown in Figs is, the packer is driven into a hole by a weight exerted on the safety head 3, the contacting stop surfaces 97 and 98 then cause the outer tubular body 4 moves downwards together with the control rod 1, the one at the upper end of the elongated hole 91 abutting with the connector head 90 a simultaneous and equal movement of the friction pieces 13 and the slips 30, 33 together with the outer body 4 causes.

However, when the retraction weight is removed from the safety head 3, it moves in the upward direction acting force of the helical spring 81 moves the valve head 80 into a closed position on its seat 82 and thereby lifts the lower flange 86 slightly. Such an upward movement of the control rod 1 moves connector head 90 up relative to crosshead 92 and thus the packer becomes the prepared for subsequent setting or anchoring in the piping when fluid pressure is on the packing seals 61 and the normally closed valve head 83 or pressure from below against seal 62 and normally closed valve head 80 for action will.

When pressure is applied from above, as occurs during the injection of liquids into the Earth formation above the set packer is the case, causes the pressure according to the illustration in Figs. 2 and 2a a downward movement of the outer tubular body 4 relative to the Cage 10, the friction pieces of which are held in place by friction in the piping. Thus, the Downward movement of the tubular body 4 a downward movement of the tubular body 9 and of the cone 37 received by it relative to the interceptor 28 with the result that the Conical surface 39 engages the slip pads 33 to anchor them in engagement with the tubing to push so that the entire packer is held against movement. It is reversed at a pressure below the packer, the tubular body 4 moves upwards relative to the cage 10, and the conical surface 38 engages the slip 30 to engage the casing Bringing intervention and holding the entire packer against movement.

The catch head 3 fits an installation tool, which is attached to a wire rope or, if necessary, to can be attached to a pipe string. As a result, the head is here with two diametrically opposed Pins 99 at its upper end are shown corresponding with those in the installation tool (not shown) Bayonet slots work together.

There are also means provided that the control rod 1 normally relative to the outer keep tubular body 4 aligned in such an angular position that the fingers 96 on the catch

head 3 in the longitudinal direction with the slots 95 in the upper end of the outer tubular body 4 cursing. In the embodiment shown, these devices comprise an elongated torsion spring 100, which extends in the longitudinal direction in a bore 101, the control rod 1 and the its lower end fixed by a coupling 102 to the control rod 1 and at its upper end is firmly connected to the safety gear 3 by a coupling 103.

For testing the packer when installing it in a bore, the outer one is tubular Body 4 is provided on one side of each slot 95 with a circumferential shoulder 104, which can be detected by the inner or lower end of the fingers 96 when the control rod 1 moved upward within the outer tubular body 4 and, for example, by a Quarter turn. In this context, it should be noted that such an upward movement of the inner control body relative to the outer tubular body 4 by the slip connection 91, 92 is possible. When the catch head 3 following an upward movement of the control rod 1 is rotated and comes into contact with the shoulders 104, one is then placed on the Catch head 3 transmitted, downward load transferred to the tubular body 4 without a to cause corresponding downward movement of the cross head 92. Such a downward movement of the body 4 relative to the cross head 92 and thus relative to the cage 10 causes the conical surface 39 to engage the slip pads 33 to anchor the packer against downward movement and so take up the weight of the incoming pipe string or the wire rope, as well as on indicate to the surface of the earth that the tool is in the setting state. Such a trial fit must be carried out while the safety gear 3 rotates against the force of the torsion spring 100 is held so that the fingers 96 assume an angular position in which they are away from the slots 95 are twisted at an angle; and when such torque is canceled, the torsion spring leads 100 return the fingers to their normal positions, aligning them with the slots 15.

Claims (7)

Patent claims: 1. Pullable borehole packer, which can be installed on the rope or rod, consisting of an elongated one Control rod extending through a tubular outer body, one the fluid passage in both directions by the outer body controlling valve assembly, one disposed on the outer body Sealing device and one axially slidable on the outer body Friction device which is radially expandable connected to a slip device, thereby characterized in that the friction device (6) has an idle upward movement of the Control rod with respect to the outer body (4) permitting slip connection (90 to 93) the lower end of the control rod (1) is connected, the upper end (2) firmly .mit a Catch head (3) is connected, but in a raised position relative to the outer 'body (4) against the force of a torque-exerting device (100) into a second angular position rotatable and can be lowered to a limited extent to carry out a trial setting of the packer. 2. Borehole packer according to claim 1, characterized in that a locking device is provided which connects the friction device (6) releasably to the outer body (4) and is spring-loaded Has ratchet lever (40), the locking provided on the outer body (4) Reach under the shoulder (49) and move into the release position by touching the wall of the borehole are pivotable. 3. Borehole packer according to claim 2, characterized in that the friction device (6) has a cage (10) which is arranged to slide axially on the outer body (4) and which is shown in FIG Slits (12) arranged in the longitudinal direction and pushed radially outward by springs (15) Friction pieces (13) and two pivotably arranged diametrically between the friction pieces Has ratchet lever (40), one lever arm (43) of which is pressed radially outward by springs (45) is, while the other lever arm (46) each reaches through an opening of the cage (10), in order to engage under the shoulder (49) provided on the outer body (4) in a locking manner. 4. Borehole packer according to one of claims 1 to 3, characterized in that the slip device (5) upper and lower axially spaced slips rigidly interconnected by connecting rods (31) (30 or 33), which by a double cone (37) provided on the outer body (4) both with an upward and with a downward axial movement of the outer Body (4) with respect to the friction device (6) are expandable. 5. Borehole packer according to one of claims 1 to 4, characterized in that the upper Ends of the slips (30, 29) are hinged to the lower arms of pivot links (22), which are pivotably mounted on the cage (10) of the friction device (6) on pivot pins (21), and by springs (24) engaging the upper arms (23) in contact with the outer body (4) are pressed, each having a lower stop surface (34) of the pivot members (22) on the Head (29) of the upper slips (30) engages to a relative outward pivoting of the am outer body (4) to prevent abutting slip slips (30, 33). 6. borehole packer according to one of claims 1 to 5, characterized in that the sealing device (7) two cuff-shaped oppositely fixed on a holder (55) forming a portion of the outer body (4) arranged packer seals (61, 62) and that the ends of the holder (55) as valve seats (82, 85) designed for valve bodies (80, 83) arranged to slide on the control rod (1) are, which are constantly pressed in the closing direction by springs (81, 84), but through on the control rod (1) provided shoulders (86, 87) can be lifted from their seats. 7. borehole packer according to one of claims 1 to 6, characterized in that the slip 709 590/50 connection (90 to 93) a with the cage (10) of the friction connection (6) connected cross head (92), which is arranged in the outer body (4) and in one at the lower end of the control rod (1) Connection head (19) provided 12th diametrically opposed elongated holes (93 and 91) penetrated. References considered: U.S. Patent Nos. 3,002,562, 3,135,327. 1 sheet of drawings 709 590/50 6.67 © Bundesdruckerei Berlin