Well tool device for opening and closing a fluid bore in a well

Abstract

A well tool device includes a housing having an axial through bore; a sleeve section releasably connected to the housing in the axial through bore, wherein the sleeve section comprises an axial bore; a frangible disc provided in the axial bore of the sleeve section in sealing engagement with the sleeve section. The sleeve section is axially displaceable within the axial through bore between a first position and a second position. The well tool device includes a first supporting sleeve fixed to the housing in the axial through bore and a second supporting sleeve provided radially inside of, and releasably connected to, the first supporting sleeve. The first supporting sleeve includes an upwardly facing surface configured to support a lower end of the sleeve section when the sleeve section is in the second position.

Claims

1. A well tool device comprising: a housing having an axial through bore; a sleeve section releasably connected to the housing in the axial through bore, wherein the sleeve section comprises an axial bore; a frangible disc provided in the axial bore of the sleeve section in sealing engagement with the sleeve section; and a first supporting sleeve fixed to the housing in the axial through bore and a second supporting sleeve provided radially inside of, and releasably connected to, the first supporting sleeve, wherein the sleeve section is axially displaceable within the axial through bore between a first position and a second position; wherein the housing comprises an axial bypass fluid passage provided axially between a first location above the sleeve section and a second location below the sleeve section when the sleeve section is in the first position, wherein the axial bypass fluid passage is provided radially between the sleeve section and the housing when the sleeve section is in the first position; wherein the well tool device comprises a sealing device provided radially between the sleeve section and the housing when the sleeve section is in the second position; and wherein the first supporting sleeve comprises an upwardly facing surface configured to support a lower end of the sleeve section when the sleeve section is in the second position.

2. The well tool device according to claim 1, wherein the axial bypass fluid passage is provided as a widened section in a radial direction of the axial through bore, wherein a height of the widened section of the axial through bore is higher than a height of the sleeve section.

3. The well tool device according to claim 2, wherein the axial bypass fluid passage is provided as a plurality of axial bypass fluid passages separated by axial sleeve guides.

4. The well tool device according to claim 2, wherein the well tool device comprises a pre-compressed locking ring provided in a recess in an outer surface of the sleeve section, and wherein the locking ring is configured to be engaged in a recess in the axial through bore in the second position.

5. The well tool device according to claim 1, wherein the axial bypass fluid passage is provided as a plurality of axial bypass fluid passages separated by axial sleeve guides.

6. The well tool device according to claim 5, wherein the well tool device comprises a pre-compressed locking ring provided in a recess in an outer surface of the sleeve section, and wherein the locking ring is configured to be engaged in a recess in the axial through bore in the second position.

7. The well tool device according to claim 1, wherein the well tool device comprises a pre-compressed locking ring provided in a recess in an outer surface of the sleeve section, and wherein the locking ring is configured to be engaged in a recess in the axial through bore in the second position.

8. The well tool device according to claim 1, wherein the second supporting sleeve comprises an upwardly facing surface configured to support the frangible disc when the sleeve section is in the second position.

9. The well tool device according to claim 8, where the well tool device comprises a disintegration device fixed to the housing; wherein the frangible disc is configured to be displaced downwardly into contact with the disintegration device when the second supporting sleeve is released from the first supporting sleeve.

10. The well tool device according to claim 1, where the well tool device comprises a disintegration device fixed to the housing; wherein the frangible disc is configured to be displaced downwardly into contact with the disintegration device when the second supporting sleeve is released from the first supporting sleeve.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Embodiments of the present invention will now be described with reference to the enclosed drawings, where:

(2) FIG. 1a illustrates a cross sectional side view of the present invention in an initial state;

(3) FIG. 1b illustrates a simplified version of FIG. 1a;

(4) FIG. 1c illustrates a cross sectional top view along line II in FIG. 1b;

(5) FIG. 1d is an enlarged view of the dashed circle C in FIG. 1b;

(6) FIG. 2a illustrates a cross sectional view of the present invention in a subsequent state;

(7) FIG. 2b illustrates a simplified version of FIG. 2a;

(8) FIG. 3a illustrates a cross sectional view of the present invention in a final state;

(9) FIG. 3b illustrates a simplified version of FIG. 2a;

(10) FIG. 4 illustrates the present invention connected in the lower end of a completion string.

DETAILED DESCRIPTION

(11) It is now referred to FIGS. 1a, 1b and 1c. Here, a well tool device 1 is shown. In the drawings, the upwardly facing parts of the well tool device 1 is facing towards the upper part of the well, i.e. topside, while the downwardly facing parts of the well tool device 1 is facing towards the lower part of the well.

(12) The well tool device 1 comprises a housing 10 having an axial through bore 11. The housing 10 is preferably a part of a completion string, a part of a production tubing or a part of a mandrel of a well plug. Hence, the well tool device 1 may be an independent well tool serving a specific purpose, or the well tool device 1 may be a part of another well tool having several purposes.

(13) The housing 10 comprises an axial bypass fluid passage 12 provided axially between a first location L1 and a second location L2. In FIG. 1b, it is shown that the distance or height between the first location L1 and the second location L2 is indicated as H12. The axial bypass fluid passage 12 is provided as a widened section 11a in the radial direction of the bore 11. In FIG. 1c, it is shown that the axial bypass fluid passage 12 is provided as a plurality of axial bypass fluid passages 12a separated by axial sleeve guides 16. There are seven axial sleeve passages 12 and seven axial sleeve guides 16 in FIG. 1c.

(14) The well tool device 1 further comprises a sleeve section 20 releasably connected to the housing 10 in the through bore 11. The sleeve section 20 is releasably connected to the housing 10 in a position hereinafter referred to as a first position P1 shown in FIG. 1a.

(15) The outer surface of the sleeve section 20 is preferably in contact with the axial sleeve guides 15 of the housing 10. The sleeve section 20 is for example connected to the housing 10 by means of shear pins, shear studs or shear screws 33, where such shear screws 33 are known to shear off at a predetermined load. As shown in FIGS. 1c and 1a, each shear screw 33 is connected to screw openings 13, 23 provided in the axial sleeve guides 16 of the housing 10 and the sleeve section 20 respectively.

(16) The sleeve section 20 has a height indicated as H20 in FIG. 1b, where the height H20 is smaller than the height H12 of the axial bypass fluid passage 12, i.e. than the distance between the first and second locations L1, L2.

(17) The sleeve section 20 comprises an axial bore 21. Preferably, the axial bore 21 is aligned with the bore 11 of the housing 10 above the first location L1, as indicated by line L in FIG. 1b.

(18) The sleeve section 20 comprises a seat 25 radially inside of the bore 21. A frangible disc 30 is provided in the seat 25 of the bore 21 of the sleeve section 20 in sealing engagement with the sleeve section. The sealing engagement is achieved by a sealing element 35, such as an o-ring, provided in the seat 25 between the sleeve section 20 and the frangible disc 30. Hence, in FIGS. 1a, 1b, 1c, fluid flow is not possible through the bore 21 of the sleeve section 20 due to the frangible disc 30 and the sealing element 35. The seat 25 is provided in the lower end of the sleeve section 20. Hence, the frangible disc 30 is inserted into the seat 25 of the sleeve section 20 from below.

(19) It should be noted that the sleeve section 20, below the seat 25 or as part of the seat 25, comprises a locking body 26 to prevent unintentional, downwardly directed movement of the frangible disc 30 in relation to the seat 25. The locking body 26 is shown in FIG. 1d. The locking body 26 can be provided as a part of the sleeve section 20, which are bent away during insertion of the frangible disc 30 into the seat 25, during the assembly operation of the well tool device 1 and which are bent towards the position of FIG. 1d after the insertion of the frangible disc 30 into the seat 30. The frangible disc is assembled with the sleeve section 20 before the sleeve section 20 and the frangible disc is inserted into the housing 10. It should be noted that if a sufficient downwardly directed force is applied to the frangible disc 30, the locking body 26 will be deformed and the frangible disc 30 will be pressed downwardly and out from the seat 25.

(20) Hence, when the sleeve section 20 is connected to the housing 10 in the first position P1 of FIGS. 1a, 1b and 1c and the device 1 is lowered into the well, fluid flowing through the bore 11 must pass through the axial bypass fluid passage 12 axially between the first location L1 and the second location L2 and radially between the sleeve section 20 and the housing 10, i.e. radially outside of the sleeve section 20. This fluid flow is indicated by a dashed arrow F. It should be noted that this arrow F is bi-directional, indicating that fluid is allowed in both directions.

(21) Accordingly, the device 1 of FIGS. 1a, 1b and 1c is open.

(22) The sleeve section 20 is axially displaceable within the bore 11. Hence, when the releasable connection to the housing 10 is released, for example by the shear screws being sheared off, the sleeve section 20 is allowed to be displaced downwardly. First, it should be noted that upwardly directed displacement is not allowed due to the diameter of the bore 11 above the sleeve section 20, as mentioned above with respect to the alignment of the bore 11 and the bore 21 along line L. Such an alignment makes upwardly directed displacement impossible.

(23) The device 1 of the present embodiment is dimensioned for a maximum fluid flow of 800-1000 liters per minute through the axial bypass fluid passage 12. If the fluid flow increased further, in the present embodiment up to 1500-2000 liters per minute, the pressure difference over the sleeve section 20 will be sufficient to shear off the shear screws 13. It should be noted that this pressure difference will not press the frangible disc 30 out of its seat 25.

(24) It should be noted that if fluid circulation is not possible, one alternative is to use a wire-line tool with weight bars and a soft end section or a drill pipe with a soft end section. The soft end section is provided to avoid undesired disintegration of the frangible disc. The soft end section may comprise a rubber body, for pushing the sleeve section 20 down by applying a sufficient force to shear of the shear screws. Again, it should be noted that this force should not press the frangible disc 30 out of its seat 25.

(25) The downwardly directed displacement of the sleeve section 20 in relation to the housing 10 can be stopped in several ways. The position in which the sleeve section 20 is stopped is hereinafter referred to as a second position P2 shown in FIGS. 2a and 2b.

(26) In FIG. 1a, FIGS. 1b, 2a and 2b, it is shown that the well tool device 1 comprises a first supporting sleeve 41 and a second supporting sleeve 42.

(27) The first supporting sleeve 41 is fixed to the outer housing 10 inside the bore 11 in a position below the second location L2. The axial distance between the second location L2 and the lower supporting sleeve 41 is preferably larger than the axial height H20 of the sleeve section 20. The lower supporting sleeve 41 is configured to stop the downwardly directed movement of the sleeve section 20 by means of its upper supporting surface 41a. Hence, when the lower end of the sleeve section 20 is in contact with the upper supporting surface 41a, the supporting sleeve 20 is in the second position P2.

(28) The well tool device 1 further comprises a disintegration device 40 fixed at a distance below the upper supporting surface 41a of the first supporting sleeve 41 in the bore 11 of the housing 10. Preferably, there are several such disintegration devices 40, such as two or three, distributed inside the bore 11. The disintegration device 40 can be fixed directly to the housing 10 or to the first supporting sleeve 41. The disintegration device 40 comprises vertically oriented knifes or other suitable pointy surfaces able to initiate disintegration of the frangible disc 30 when the frangible disc 30 is pushed towards the disintegration device 40. As is known, a frangible disc 30 made of hardened glass will be disintegrated into very small glass particles when such disintegration has been initiated.

(29) The second supporting sleeve 42 is located radially inside the first supporting sleeve 41, and is releasably connected to the first supporting sleeve 41. In the present embodiment, the second supporting sleeve 42 is releasably connected to the first supporting sleeve 41 by means of a system as described in EP2978926B1, which is hereby incorporated by reference. EP2978926B1, in the name of Vosstech, a subsidiary of Interwell, describes a system where two such sleeves are allowed to move in relation to each other due to a predetermined number of pressure changes.

(30) The second supporting sleeve 42 comprises an upper supporting surface 42a for supporting the frangible disc 30 when the sleeve section 20 is in the second position P2. In FIG. 3a, it is shown that the second supporting sleeve 42 comprises a vertical slit 42b in which the disintegration device 40 is located before the release of the second supporting sleeve 42 from the first supporting sleeve 41. Hence, when the supporting sleeve 20 is in its first and second position P1 and P2, the disintegration device 40 is provided in the slit 42b of the second supporting sleeve 42.

(31) It is now referred to FIGS. 1a, 1b, 2a and 2b again. In the present embodiment, the well tool device 1 comprises a pre-compressed locking ring 34 provided in a recess 24 in an outer surface 20o of the sleeve section 20. A recess 14 is provided in the bore 11 at a desired position. In the present embodiment, the location of the lower supporting sleeve 41 is adapted to the locations of the recesses 14, 24 so that when the lower end of the sleeve section 20 is in contact with the upper supporting surface 41a, then the recess 14 is vertically aligned with recess 24, thereby allowing the locking ring 36 to expand. The locking ring 34 is configured to be engaged in the recess 14 in the bore 11 during or after the downwardly directed movement, thereby locking the sleeve section 20 to the housing 10 as the locking ring 34 is engaged in both the recess 24 of the sleeve section 20 and the recess 14 of the bore 11.

(32) Hence, the sleeve section 20 is stopped in the position P2 by means of the lower supporting sleeve 41 and is locked in this position P2 by means of the locking ring 34.

(33) The well tool device 1 further comprises a sealing device 36 provided radially between the sleeve section 20 and the housing 10 when the sleeve section 20 is in the second position P2. The sealing device 36 may be an o-ring located in a recess provided in the bore 11 below the second location L2 and above the lower supporting sleeve 41. Hence, when the sleeve section 20 is in the second position P2, fluid is prevented from flowing through the bore 11 as the sealing device 36 prevents fluid from flowing in an axial direction radially outside of the sleeve section 20. Due to the sealing element 35 provided between the frangible disc 30 and the seat of the sleeve section 20, fluid flow through bore 21 is also prevented.

(34) Accordingly, the device 1 of FIGS. 2a and 2b is closed. Hence, if the housing 10 is a part of a completion string, it is now possible to perform a pressure testing of the completion string above the sleeve section 20.

(35) In FIG. 2a, a fluid pressure Pa is indicated above the frangible disc 30, while a fluid pressure Pb is indicated below the frangible disc 30.

(36) In FIG. 3a and FIG. 3b, it is shown that the second supporting sleeve 42 has been moved downwardy in relation to the first supporting sleeve 41, by variating the pressure difference Pa/Pb, thereby actuating the system described in EP2978926B1. When the second supporting sleeve 42 has moved, the frangible disc 30 is not supported by the upper supporting surface 42a anymore. By increasing the pressure above the frangible disc 30, the frangible disc 30 will be pressed downwardly and cause a deformation of the locking body 26 of the sleeve section 26 until the frangible disc 20 is released from its seat 25. The frangible disc 20 will move downwardly until it meets the disintegration device 40. It should be noted that the frangible disc 30 in the present embodiment only moves about 1 mm, or a couple of mm before it meets the disintegration device 40, i.e. the frangible disc 30 does not leave it seat 25 entirely before disintegration.

(37) In FIG. 3a and FIG. 3b it is also shown that the frangible disc 30 has been disintegrated. The bore 11 is now open and the device 1 is in an open state again.

(38) The operation of the well tool device 1 will now be described. Initially, it is referred to FIG. 4. Here, the upper end of the well tool device 1 is connected to a lower part of a completion string CS, where the completion string CS with the well tool device 1 is inserted into a well W drilled into an oil and/or gas reservoir R.

(39) In a first or initial step, the device 1 is open, i.e. the sleeve section 20 is in the first position P1. Fluid may be supplied at an initial fluid rate from topside and into the well W via the bore 11 of the device 1, as described with respect to FIGS. 1a, 1b and 1c above.

(40) In FIG. 4, it is shown that a completion packer CP has been set between the outer surface of the completion string CS and the inner surface of the well W. As mentioned in the introduction above, fluid in the well may be replaced before the packer CS is set.

(41) When desired, the device 1 can be brought to the closed state by moving the sleeve section 20 from the first position P1 to the second position P2. This can be done by increasing the fluid flow rate as described above, causing the shear screws 13 to be sheared off. Alternatively, this can be done by pushing the sleeve section 20 downwardly by means of the abovementioned tool with a soft end section, also causing the shear screws 13 to be sheared off.

(42) The pressure in the completion string can now be increased to a predetermined value in order to test the integrity of the casing string CS.

(43) If the test is successful, the operator can proceed to the next step.

(44) In the next step, the device 1 can be brought to an open state again by releasing the second supporting sleeve 42 from the first supporting sleeve 41 and pushing the frangible disc 30 downwardly towards the disintegration device 40 causing the disintegration of the frangible disc 30. Production from the well can now start.

(45) Alternatively, the frangible disc may be disintegrated by means of a separate disintegration tool, such as a spear or other type of sharpened tool which will initiate a disintegration of the frangible disc when lowered down onto the frangible disc.

(46) Alternatively, the frangible disc may comprise an axial through opening sealed by an actuation device, as described in NO 338289 (B1) in the name of Vosstech. Here, disintegration is initiated by pushing the actuation device downwardly or by pulling the actuation device upwardly. In yet an alternative, the frangible disc itself may comprise an upwardly protruding neck portion, as described in NO 340798 B1 in the name of Interwell. Here, disintegration is initiated by pushing the neck portion sideways, causing it to disintegrate from the rest of the frangible disc.