The present invention relates to inflatable bags for use down a drill hole, such as to provide a platform or plug inside of the drill hole.
Inflatable bags are also known with a compressed inflation fluid in a cannister, which is released into the bag in a controlled manner. Whilst these types of bags are effective the inflation fluids are typically gasses that have a GWP or health concerns greater than CO2.
Inflatable bags are known to have reagents, such as a carbonate or bicarbonate salt and an acid, which produce an inflation medium (typically CO2) for inflating the bag when it is lowered inside the drill hole. The problem is that the reaction of the reagents needs to be slow enough to position the bag, but quick enough so that time is not wasted waiting for the reaction to be sufficiently progressed for the bag to be inflated enough for it to hold itself in place. A problem with existing solutions is that the reaction time is not sufficiently controlled, or that the reagent(s) clump or otherwise do not properly mix so as to react, or require breakage of a frangible component (typically holding the acid) which risks puncture of the bag from sharp remnants of the frangible component. An alternative is desired.
Any document, reference, patent application or patent that might be cited in this text is expressly incorporated herein in their entirety by reference, which means that it should be read and considered by the reader as part of this text. That the document, reference, patent application, or patent cited in this text is not repeated herein is merely for reasons of conciseness.
In this specification, where a literary work, act or item of knowledge (or combinations thereof), is discussed, such reference is not an acknowledgment or admission that any of the information referred to formed part of the common general knowledge as at the priority date of the application. Such information is included only for the purposes of providing context for facilitating an understanding of the inventive concept/principles and the various forms or embodiments in which those inventive
According to an aspect of the present invention there is provided an inflatable down hole bag, comprising:
an inflatable body for holding an inflation fluid;
a container for holding one or more substances, the container being disposed inside of the inflatable body;
wherein the container comprises a closure for keeping the one or more substances in the container when the closure is in an inoperative state, the closure also for releasing the one or more substances from the container when the closure is in an operative state;
wherein release of the one or more substances causes an inflation fluid producing reaction within the inflatable body, thereby inflating the inflatable body; wherein, the container comprises at least two separated chambers, each chamber for holding a respective one of the substances, wherein the closure comprises a stopper for closing a respective opening to one of the chambers, wherein the closure further comprises an actuator for removing each stopper from the respective opening so as to release each substance from each respective chamber.
Preferably, the actuator comprises a stopper withdrawing mechanism and a trigger, wherein pressing on the trigger operates the stopper withdrawing mechanism. Typically, the trigger comprises a contact tab for receiving pressure to operate the trigger.
Preferably, the stopper in is an interference fit with the opening. Preferably the stopper comprises an annular rib in the interference fit with a groove of the opening.
Preferably, the stopper mechanism restrains the stopper from opening until the trigger mechanism is activated. Preferably the stopper comprises a releasable holder for restraining the stopper. Preferably, the holder comprises an upper member for preventing upward movement of the stopper relative to the opening. Preferably, the holder comprises a lower member for preventing downward movement of the stopper relative to the opening. Preferably, the stopper comprises a flange extending substantially laterally relative to the opening. Preferably the upper member is disposed above the flange. Preferably the lower member is disposed below the flange and is preferably initially not in contact with the flange, but when the trigger is activated the lower member moves underneath the flange. Preferably, the holder comprises a vertical portion extending between upper member and the lower member. Preferably vertical portion pushes against the flange when the trigger is activated.
Preferably, the stopper withdrawing mechanism comprises a wedge mechanism for lifting the stopper relative to a body of the container.
Preferably, the stopper withdrawing mechanism comprises a pivot mechanism for pivoting a side of the stopper relative to a body of the container.
Preferably, the stopper withdrawing mechanism comprises a wedge mechanism for lifting the stopper relative to a body of the container and a pivot mechanism for pivoting a side of the stopper relative to a body of the container. Typically, the wedge mechanism and pivot mechanism are substantially sequential in operation.
Alternatively, the stopper withdrawing mechanism comprises an engagement mechanism for engaging a portion of the stopper and a pivot mechanism for pivoting a side of the stopper relative to the opening of the container. In an embodiment the engagement mechanism comprises the lower member and the pivot mechanism comprises the vertical portion.
In an embodiment, the inflatable body comprises a reaction bag within the inflatable body within which the container is disposed.
Preferably, the reaction bag comprises a sloped internal surface when the inflatable down hole bag is oriented for lowering into the hole such that the substances are urged to move to a lowermost part of the reaction bag under the influence of gravity.
Preferably, the reaction bag comprises a first reagent substance within one or more dissolvable skins and at least one of the substances within the container is a second reagent capable of dissolving the dissolvable skin, and the first and second reagents when in contact produce or contribute to the production of the inflation fluid producing reaction.
Preferably, the or each dissolvable skin with the first reagent therein is in the form of a tablet. In an embodiment the rate of the inflation fluid producing reaction is selectable by selecting the size of the or each of the tablets.
According to an aspect of the present invention there is provided a container for release of a reactive substance into an inflatable down hole bag, comprising:
a container body for holding one or more substances; and
a closure for keeping the one or more substances in the container when the closure is in an inoperative state, the closure also for releasing the one or more substances from the container when the closure is in an operative state;
wherein release of the one or more substances causes an inflation fluid producing reaction within the inflatable body, thereby inflating the inflatable body; wherein, the container comprises at least two separated chambers, each chamber for holding a respective one of the substances, wherein, the closure comprises a stopper for closing a respective opening to one of the chambers. In an embodiment, the closure further comprises an actuator for removing each stopper from the respective opening so as to release each substance from each respective chamber.
In an embodiment, the actuator comprises a stopper withdrawing mechanism and a trigger, wherein pressing on the trigger operates the stopper withdrawing mechanism. Typically, the trigger comprises a contact tab for receiving pressure to operate the trigger.
Preferably, the stopper in is an interference fit with the opening. Preferably the stopper comprises an annular rib in the interference fit with a groove of the opening.
Preferably, the stopper withdrawing mechanism restrains the stopper from opening until the trigger mechanism is activated. Preferably the stopper comprises a holder for restraining the stopper. Preferably, the holder comprises an upper member for preventing upward movement of the stopper relative to the opening. Preferably, the holder comprises a lower member for preventing downward movement of the stopper relative to the opening. Preferably, the stopper comprises a flange extending substantially laterally relative to the opening. Preferably the upper member is disposed above the flange. Preferably the lower member is disposed below the flange and is preferably initially not in contact with the flange, but when the trigger is activated the lower member moves underneath the flange. Preferably, the holder comprises a vertical portion extending between upper member and the lower member. Preferably vertical portion pushes against the flange when the trigger is activated.
In an embodiment, the stopper withdrawing mechanism comprises a wedge mechanism for lifting the stopper relative to a body of the container. In an embodiment, the stopper withdrawing mechanism comprises a pivot mechanism for pivoting a side of the stopper relative to a body of the container. Typically, the wedge mechanism and pivot mechanism are substantially sequential in operation.
Alternatively, the stopper withdrawing mechanism comprises an engagement mechanism for engaging a portion of the stopper and a pivot mechanism for pivoting a side of the stopper relative to the opening of the container. In an embodiment the engagement mechanism comprises the lower member and the pivot mechanism comprises the vertical portion.
According to an aspect of the present invention there is provided a method of inflating a down hole bag, comprising:
providing an inflatable bag having an inflatable body for holding an inflation fluid; the bag comprising a container for holding two or more substances in at least two separated chambers, each chamber for holding a respective one of the substances, the container being disposed inside of the inflatable body, the container comprising a closure which comprises a stopper for closing a respective opening to one of the chambers;
activating an actuator of the container so as to change it from an inoperative state where the one or more substances in the container a held therein to an operative state wherein upon the change from the inoperative state to the operative state removes each stopper from the respective opening so as to release each of the substances of each respective chamber of the container into the inflatable body;
wherein release of the one or more substances causes an inflation fluid producing reaction within the inflatable body, thereby inflating the inflatable body.
According to an aspect of the present invention there is provided a method of opening a container for release of a reactive substance into an inflatable down hole bag, comprising:
providing a container having a body for holding two more substances in at least two separated chambers, each chamber for holding a respective one of the substances; and a closure for keeping the substances in the container when the closure is in an inoperative state, the closure comprises a stopper for closing a respective opening to one of the chambers, the closure also comprising an actuator for releasing the substances from the container when the closure is in an operative state;
activating the closure so as to removes each stopper from the respective opening so as to release the substances such that they cause an inflation fluid producing reaction within the inflatable bag.
Any document, reference, patent application or patent that might be cited in this text is expressly incorporated herein in their entirety by reference, which means that it should be read and considered by the reader as part of this text. That the document, reference, patent application, or patent cited in this text is not repeated herein is merely for reasons of conciseness.
In this specification, where a literary work, act or item of knowledge (or combinations thereof), is discussed, such reference is not an acknowledgment or admission that any of the information referred to formed part of the common general knowledge as at the priority date of the application. Such information is included only for the purposes of providing context for facilitating an understanding of the inventive concept/principles and the various forms or embodiments in which those inventive
Various aspects described herein can be practiced alone or combination with one or more of the other aspects, as will be readily appreciated by those skilled in the relevant art. The various aspects can optionally be provided in combination with one or more of the optional features described in relation to the other principal aspects. Furthermore, optional features described in relation to one example (or embodiment) can optionally be combined alone or together with other features in different examples or embodiments.
For the purposes of summarising the aspects, certain advantages and novel features have been described herein above. It is to be understood, however, that not necessarily all such advantages may be achieved in accordance with any particular embodiment or carried out in a manner that achieves or optimises one advantage or group of advantages as taught herein without necessarily achieving other advantages as may be taught or suggested herein.
Further features of the invention are described in the following description of several non-limiting embodiments thereof. This description is included solely for the purposes of exemplifying the inventive principles. It should not be understood as a restriction on the broad summary, disclosure or description as set out above. The description is made with reference to the accompanying drawings in which:
In the figures, like elements are referred to by like numerals throughout the views provided. The skilled reader will appreciate that elements in the figures are illustrated for simplicity and clarity and have not necessarily been drawn to scale. For example, the dimensions and/or relative positioning of some of the elements in the figures may be exaggerated relative to other elements to facilitate an understanding of the various embodiments exemplifying the principles described herein. Also, common but well understood elements that are useful or necessary in a commercially feasible embodiment are often not depicted in order to provide a less obstructed view of these various embodiments. It will also be understood that the terms and expressions used herein adopt the ordinary meaning as is accorded to such terms and expressions with respect to their corresponding respective areas of inquiry and study except where specific meanings have otherwise been set forth herein.
It should be noted that the figures are schematic only and the location and disposition of the components can vary according to the particular arrangements of the embodiment(s) as well as of the particular applications of such embodiment(s).
Specifically, reference to positional descriptions, such as ‘lower’ and ‘upper’, and associated forms such as ‘uppermost’ and ‘lowermost’, are to be taken in context of the embodiments shown in the figures, and are not to be taken as limiting the scope of the principles described herein to the literal interpretation of the term, but rather as would be understood by the skilled reader.
Embodiments described herein may include one or more range of values (eg. size, displacement and field strength etc). A range of values will be understood to include all values within the range, including the values defining the range, and values adjacent to the range which lead to the same or substantially the same outcome as the values immediately adjacent to that value which defines the boundary to the range.
Other definitions for selected terms used herein may be found within the detailed description and apply throughout. Unless otherwise defined, all other scientific and technical terms used herein have the same meaning as commonly understood to one of ordinary skill in the art to which the embodiment(s) relate.
The words used in the specification are words of description rather than limitation, and it is to be understood that various changes may be made without departing from the spirit and scope of any aspect of the invention. Those skilled in the art will readily appreciate that a wide variety of modifications, alterations, and combinations can be made with respect to the above described embodiments without departing from the spirit and scope of any aspect of the invention, and that such modifications, alterations, and combinations are to be viewed as falling within the ambit of the inventive concept.
Throughout the specification and the claims that follow, unless the context requires otherwise, the word “comprise” or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
Furthermore, throughout the specification and the claims that follow, unless the context requires otherwise, the word “include” or variations such as “includes” or “including”, will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
Referring to
Referring to
The released reagent substances 32 and 34 mix at 36 and (chemically) react causing release of an inflation fluid 38, such as carbon dioxide (CO2) gas, thereby inflating inner bag 14, and in turn the outer bag 12, and thus the inflatable body.
The inside 18 of the inner bag 14 houses the reaction. In order to aid in the mixing of the reagent substances the inner reaction bag 14 comprises a sloped internal surface 20 when the inflatable down hole bag 10 is oriented for lowering into the drill hole such that the substances are urged to move to a lowermost part 22 of the reaction bag under the influence of gravity. Further the container 30 is fixed (such as by adhesive) to a side wall of the inner bag 14 so as to be disposed relatively high above the lowermost point 22. The drop of the falling substances 32 and 34 from the container 30 on impact with the mix 36 preferably causes agitation to the mix 36, thereby encouraging complete reaction of the substances and avoiding clumping. Such is useful when faster reaction time (and in turn inflation time) is desired.
However, a slower reaction time may also be desired. In that instance one or some of the reagent substances may be within a tablet 35 having (or not having) a dissolvable skin or coating. Thus, for instance when liquid, such as acid 34, is released from the container the acid will begin to dissolve the skin of the tablet 35, or the tablet 35 will be designed to be a rapidly dissolving tablet (RDT). As the acid contacts the reagent substance(s) therein (such as bicarbonate or carbonate salt) this will react thereby creating the inflation fluid 38, but only after the delay of the acid dissolving the skin has occurred. The reaction rate can also be controlled by the size of the tablet or tablets 35, due to the reaction rate being dependent on the surface area of the or each tablet 35 undergoing reaction or the tablet composition as in the case of a RDT without a skin.
The tablet(s) 35 may be loose within the inner bag 14, adhered to a position in the region of the lower most point 22 or released from the container 30.
It will be appreciated that reagent substances other than a carbonate/bicarbonate salt and an acid may be used and indeed more than two reagent substances may be used. For example, the acid may be in a dry solid form (eg. citric acid granules) that is activated when wet, such as by the release of water from one or the chambers of the container 30. Further the container 30 may only have one of the reagent substances when another is already in the inner reaction bag 14.
The amounts/proportions of the reagent substances can be selected for the size of the bag 10 and the amount of inflation fluid 38 to be produced. In this example chamber 42 is smaller than chamber 44 and the chambers 42 and 44 are connection by a web 40. In an embodiment the chambers 42, 44 have screw tops 46 and 48, respectively. A cap 130 having a hole 100 substantially axially therethough is screwed to each screw top 46, 48. In the hole 100 is a stopper having a disc portion 72 which is held in placed by an interference or taper fit (such as a snap fit arrangement). The hole 100 is defined by a lip 70.
Referring to
In an embodiment, the release actuator assembly 120 comprises a stopper withdrawing mechanism and a trigger, wherein pressing on the trigger operates the stopper withdrawing mechanism. The trigger comprises the plate 82 for receiving pressure to operate the trigger. Each stopper 72 (and 72′) comprises a disc forming the body of the stopper 72 which seals the respective hole 100 in the respective cap 130, which hole 100 is defined by the respective lip 70 (and 70′), an axially aligned projection 74 (see
The skirt 60 also comprises a platform 90 between the lips 70, 70′. The release actuator assembly 120 further comprises a wedge member 84, a latch 80 and a slide 88. The release actuator assembly 120 moves as the tab 82 is pushed. In particular the slide 88 slides over the platform 90 as the tab 82 is pushed. The wedge member 84 projects from the tab 82 and has a clearance 92 underneath it. The wedge member 84 has a sloped surface portion as seen in
The release actuator assembly 120 is in an inoperative state as shown in
Pressing the tab 82 causes the wings 114 to flex until they are released from the protrusions 112, such that the protrusions no longer hold the wings 114 and thus the release actuator assembly 120 captive in the skirt 60. Further, slide 88 moves along the platform 90 and the wedge member 84 moves into the space between the hat 76 and the disc of the stopper 72 until the sloped surface portion contacts the hat 76 as indicated by C in
In an embodiment (not shown) the platform or the slide may comprise a ramp for adding a displacement of the wedge member 84 to the action (providing a similar effect to the wedging of the wedge member 84) with movement of the release actuator assembly 120.
As the tab 82 continues to be pushed, as indicated by P2 in
As the tab 82 is continues to be pushed, as indicated by P3 in
As the tab 82 is continues to be pushed, as indicated by P4 in
As the tab 82 is continues to be pushed as indicated by P5 in
The bag 10 is then inverted and lowered into the drill hole (not shown). In doing so the container is inverted to be in the orientation shown in
Referring to
The release actuator assembly 220 is held in place, for example using similar wings 114 (to those of the release actuator assembly 120) extending from a tab 82 of the release actuator assembly 220. The wings 114 interfere with protrusions 112 on the inside of the skirt 60.
In an embodiment, the release actuator assembly 220 comprises a stopper withdrawing mechanism, similar in function to the embodiment of 120, but different in form, and a trigger. Pressing on the trigger operates the stopper 72 withdrawing mechanism. The trigger comprises the plate 82 for receiving pressure to operate the trigger. Each stopper 72 (and 72′) comprises a disc forming the body of the stopper 72 which seals the respective hole 100 in the respective cap 130, which hole 100 is defined by a respective lip 70 (and 70′). The stopper 72 also comprises an axially aligned projection 74 and a hat 76. The projection 74 and the hat 76 form a T-shape in cross section, and with the disc form a somewhat H shape in cross section.
The skirt 60 also comprises a platform 90 between the lips 70, 70′ in the form of a projecting stripe that extends from the skirt 60. The release actuator assembly 120 further comprises a holder for restraining the stopper 72, a slide 88 and the platform 90. The release actuator assembly 220 moves as the tab 82 is pushed. In particular, the slide 88 slides over the platform 90 as the tab 82 is pushed. In an embodiment, walls 186, 186′ are on the sides (preferably outsides) of the platform 90 and another (complementary) platform 90′ and ensure the release actuator assembly 120 is restricted to move in a direction aligned with the lengths of the platforms 90, 90′. The holder comprises an upper member 180 disposed above the hat 76 for preventing upward movement of the stopper 72 relative to the opening. Thus, the stopper 72 is held closed until the trigger is activated.
The release actuator assembly 120 is held in within the skirt 60 by a retention mechanism until the trigger is fully actuated. In an embodiment, the retention mechanism comprises a downward projection 190 having a flange 196 and in this case opposite facing flanges. The flanges 196 fit between and may contact the caps 130. Connected to the skirt 60 and the platform 90 is inward projection 192 (for each cap) against which the downward projection 190 can slide and under which the flange 196 slides. The inward projection 192 retains the flange 196 and thus the projection 190 and in turn the release actuator assembly 120 until the flange reaches an opening 194, whereupon the flange 196, which is sized to fit through the opening 194, can move though so as to release the release actuator assembly 120. The opening 194 is positioned such that the trigger has engaged the stopper 72, and in some embodiments, removes the stopper 72 from the opening 100.
Preferably, the holder comprises a lower member 206, 208 disposed below the hat 76 and between with the projection 74 is able to be received for preventing downward movement of the stopper 72 relative to the opening. Preferably the lower member 206, 208 is preferably initially not in contact with the hat 76, but when the trigger is activated the holder and in particular the lower member 206, 208 moves underneath the flange of the hat 76. Preferably, the holder comprises a vertical portion 202, 203, 204 extending between upper member 180 and the lower member 206, 208. Preferably the vertical portion 202, 203, 204 is curved to conform to the shape of a matching part of the hat 76. Preferably a rear part 203 of the vertical portion (seen in
The release actuator assembly 220 is in an inoperative state as shown in
Pressing the tab 82 causes the wings 114 to flex until they are released from the protrusions 112, such that the protrusions no longer hold the wings 114 and thus the release actuator assembly 120 captive in the skirt 60.
Further, slide 88 moves along the platform 90 and the holder engages the hat 76. Then, when the rear part 203 of the vertical portion contacts the hat 76, further pressure on the tab 82, indicated by P2, causes the rear part 203 to lift and pivot the stopper 72. A wedge mechanism similar to that described above may also be used at this point. In an embodiment the opening 194 is defined by a ramped surface 198, which acts as a wedge mechanism by pushing the flange 196 relatively upward, which in turn causes the release actuator assembly 120 and the held stopper 72 to be lifted. Lifting of the stopper 72 lifts it out from its interference fit in the hole 100 defined by the lip 70.
This embodiment of the release actuator assembly 220 is able to hold the stopper 72 in place against a force this might overcome the interference fit. Accordingly, this embodiment may use a lower force requirement to dislodge the stopper 72 from the opening 100 in comparison to the embodiment of the release actuator assembly 120 that used resilience of the latch 80 to hold the stopper 72 in place and the wedge mechanism, including wedge member 84, to overcome the interference fit so as to lift the stopper 72 from the hole 100.
When the release actuator assembly 220 has fully released the stopper 72 from the hole 100 it can fall away and the contents of each chamber 42, 44 of the container 30 can then empty, as indicated by E1 and E2 in
The skilled reader would readily appreciate the nature of the materials appropriate for making the components of the embodiments of the arrangements described herein. Modifications and variations as would be apparent to the skilled addressee are intended to be covered by the accompanying claims.
Future patent applications maybe filed in Australia or overseas on the basis of, or claiming priority from, the present application. It is to be understood that the following claims are provided by way of example only and are not intended to limit the scope of what may be claimed in any such future application. Features may be added to or omitted from the provisional claims at a later date so as to further define or re-define the invention or inventions.
Number | Date | Country | Kind |
---|---|---|---|
2018903977 | Oct 2018 | AU | national |
This application is a continuation of PCT/AU2019/051146 filed Oct. 21, 2019, which claims priority to AU Patent Application No. 2018903977, filed Oct. 19, 2018, the entire disclosures of which are incorporated herein by reference.
Number | Date | Country | |
---|---|---|---|
Parent | PCT/AU2019/051146 | Oct 2019 | US |
Child | 17232664 | US |