AU2015318725B2 - A retrievable subsea apparatus with a pressure and volume compensating system - Google Patents
A retrievable subsea apparatus with a pressure and volume compensating system Download PDFInfo
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- AU2015318725B2 AU2015318725B2 AU2015318725A AU2015318725A AU2015318725B2 AU 2015318725 B2 AU2015318725 B2 AU 2015318725B2 AU 2015318725 A AU2015318725 A AU 2015318725A AU 2015318725 A AU2015318725 A AU 2015318725A AU 2015318725 B2 AU2015318725 B2 AU 2015318725B2
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- 239000003921 oil Substances 0.000 claims description 42
- 239000007788 liquid Substances 0.000 claims description 37
- 239000000463 material Substances 0.000 claims description 17
- 239000012528 membrane Substances 0.000 claims description 16
- 238000009434 installation Methods 0.000 claims description 8
- 239000013535 sea water Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 238000005461 lubrication Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 239000002480 mineral oil Substances 0.000 claims description 3
- 235000010446 mineral oil Nutrition 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 108010001267 Protein Subunits Proteins 0.000 claims 2
- 230000004888 barrier function Effects 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 6
- 230000000670 limiting effect Effects 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 229910001092 metal group alloy Inorganic materials 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 230000004323 axial length Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000000873 masking effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000135 prohibitive effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010689 synthetic lubricating oil Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0007—Equipment or details not covered by groups E21B15/00 - E21B40/00 for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/035—Well heads; Setting-up thereof specially adapted for underwater installations
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
- E21B33/04—Casing heads; Suspending casings or tubings in well heads
Abstract
A retrievable subsea apparatus (1) with a pressure and volume compensating system, the apparatus comprising: a housing (1') having in its interior a control system (9) located in a first section (3) thereof and an operating unit (6) located in a second section (4) thereof. The apparatus further comprises a penetrator (2) which constitutes an interface between the first section (3) and the second section (4), wherein the first section (3) has a substantially constant first pressure. An external pressure compensator (5, 5') is associated with the second section (4) having a second pressure. The operating unit (6) comprises at least a first sub-unit (6') and at least a second sub-unit (6"). The second section (4) is subdivided into at least a first sub-section (4') and at least a second sub-section (4") which is sealed off from the first section (4') and being associated with respective sub-unit (6', 6").
Description
A RETRIEVABLE SUBSEA APPARATUS WITH A PRESSURE AND
VOLUME COMPENSATING SYSTEM
Field of the invention 5
The present invention relates to a retrievable subsea apparatus with a pressure and volume compensating system, the apparatus comprising a housing having in its interior a control system located in a first section thereof and an operating unit located in a second section thereof, as defined in the preamble of attached 10 claim 1.
The invention is also related to a usage of the various embodiments of the subsea apparatus, as defined in claim 21.
Background of the invention
Currently, compensating may be grouped in several categories. They all work on the principle of providing a “displaceable” or flexible barrier between one environment and a second environment. The barrier may have attributes so that 20 the pressures of the environments are within a certain ratio compared to each other. This is achieved by having different pressure areas on each side of the barrier, or by having a barrier movement that is also controlled by a parallel force, such as through the stiffness of the barrier or by a separate spring.
The three most common pressure and volume compensating devices are related to: a displacement piston in a cylinder, a flexible “bellow” of e.g. a polymeric material or metal, and a flexible membrane, e.g. exhibiting a rubber diaphragm.
The displacement piston relies on dynamic seals, and may leak or get stuck, and the rubber of the flexible membrane may deteriorate such as by oxidation or cracking of the material, which may in the end lead to leakage.
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In a subsea operating system which compensates for pressure and/or volume as regards more than one chamber in the system, then typically each chamber has a compensator device which has an interface to the external environment. This will inherently add to the external bulk of the subsea apparatus, such as
e.g. an actuator which is to operate on subsea installations, and doubles the risk of leakage of seawater through the compensators and into the oil filled chambers of the apparatus. Also, this makes it more difficult to realize an optimal, pre-defined pressure ratio between the oil filled chambers due to these chambers being controlled independently.
Such a prior art system may have compensators in “series”. The compensators may be physically “stacked” onto each other. This will yield only one interface to the external environment, and the ratio between the chambers may easily be controlled. However, such a prior art arrangement again adds external bulk to the subsea apparatus. It also makes the monitoring of the position of the barrier which interfaces with the seawater, through a sensor, very difficult. This is due to the second compensator in the series masking access to the first compensator as regards the sensor.
In preferred embodiments the present invention advantageously provides an improved retrievable subsea apparatus which remedies the disadvantages of prior art systems and devices, in order to yield an apparatus which is technically simpler, has reduced weight and volume, can be made more compact and durable, facilitates easier monitoring, and presents a reduced cost of the apparatus compared to the prior art.
Summary of the invention
In one aspect of the invention, the retrievable subsea apparatus comprises the 30 features of:
- that a penetrator constitutes an interface between the first section and the second section, wherein the first section has a substantially constant first pressure,
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- that an external pressure compensator is associated with the second section having a second pressure,
- that at least a first sub-unit and at least a second sub-unit constitute the operating unit,
- that at least a first sub-section and at least a second sub-section constitute the second section ,
- that a first liquid is located in the first sub-section, and a second liquid is located in the second sub-section,
- that the second sub-section is sealed off from the first sub-section,
- that the external compensator is in communication with the first subsection,
- that the first sub-unit is at least partly associated with the first subsection and the second sub-unit is associated with the second subsection, and
- that an internal pressure compensator is configured to adjust for any pressure differences between said first and second sub-sections and is in contact with the first liquid in the first sub-section and with the second liquid in the second sub-section.
Further embodiments of the inventive retrievable subsea apparatus appear from the attached claims 2 - 20.
The usage of the apparatus, as defined in claim 21, is in a non-limiting embodiment related to operate or adjust the state of a subsea installation by letting a movable connector at a downstream region of the second sub-unit engage a moveable mating connector on the installation.
In an embodiment the first sub-unit comprises an electric motor, and the second sub-unit comprises a gear assembly.
In an embodiment the first pressure in the first section is substantially at sea surface level atmospheric pressure.
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In an embodiment the second pressure is equal to or above the subsea pressure surrounding the apparatus housing.
In an embodiment the external pressure compensator is configured to effect a 5 volumetric displacement of the first liquid in said first sub-section to cause the internal pressure compensator to yield a corresponding volumetric change in the second sub-section.
In an embodiment the external pressure compensator is made from at least one 10 of or a composition of at least two of: a metal, a metal alloy, a rubber-type material and a plastics material.
In an embodiment the closed end of the first bellow is linked to or communicate with a bellow movement sensor.
In an embodiment the bellow movement sensor is a linear movement sensor of inductive, capacitive, or resistive type.
In an embodiment the membrane is located at one axial end of the hole.
In an embodiment the hose resides with a part of its body in a recess of a face of the wall in the first sub-section.
In preferred embodiments the invention is related to a novel pressure and 25 volume compensating apparatus, and in particular, but not necessarily an apparatus commonly known as a rotary subsea actuator or a subsea drive module apparatus for subsea related oil and gas industry.
Advantageously it is one intention of the present inventive apparatus to maintain 30 the internal pressures of at least two isolated, oil-filled compartments in the apparatus to be at pre-defined ratios compared to the pressure of the outside environment. Such environment is usually, however not always, seawater at different water depths of down to 4,000 meters or even more. In other words,
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2015318725 22 Jan 2020 the external pressure outside the apparatus may vary from atmospheric pressure to more than 400 bars.
In addition to this, the ambient temperature about the actuator may vary.
Typically, the temperature may lie between zero and plus 50 degrees Centigrade. Furthermore, the internal temperature of the oils used inside the apparatus may fluctuate independently from the ambient temperature. Also, compounding this, the temperatures of the oils in the at least two oil-filled subsections of the second section, may mutually fluctuate. The reason for such internal fluctuation is that the apparatus has internal devices such as e.g. a motor, a control system and a transmission system, e.g. a gear assembly.
During operation of the apparatus, these devices produce different heat energies and associated therewith there may be a rise in the temperature of the 15 oil in the respective sub-section or chamber. Further, the different oil filled chambers have different devices therein, and they obviously contain different volumes of oil. This may then lead not only to different temperatures in the chambers, but also to different changes of the oil volumes caused by temperature changes.
In a non-limiting embodiment of the invention, the oils in the sub-sections or chambers are typically also different, implying that one sub-section may contain e.g. a dielectric silicone oil, whereas the other may contain e.g. a mineral oil or a synthetic or semi-synthetic lubrication oil. Different types of oils may have 25 different physical properties which can influence how their volumes change according to pressure or temperature changes. This property is the so-called “bulk modulus” of the oil.
Typically, the pressure compensating means of the apparatus works by 30 “allowing” that the oil volumes of inside the sub-section of the apparatus vary according to circumstances described above, at the same time as pre-defined pressure ratios are maintained.
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When, due to the shortcomings of the prior art the series arrangement of compensators, the internal compensator is placed internally of the apparatus between the oil chambers, the internal bulk of the apparatus is increased. This is disadvantageous as regards the axial length or height of the apparatus. When 5 the height of the apparatus increases, so does the weight of the apparatus as well. The apparatus is typically to be of a retrievable type. This means that it may be positioned on a subsea installation as well as being retrieved therefrom e.g. by pulling action, to be replaced, and wherein such operation is to be carried out by a ROV (Remotely Operated Vehicle). However, there is a limit to 10 what weight load such a ROV may be able to operate. In many cases, it is difficult to be able to engineer the apparatus to have a low enough weight load for the ROV operation. This implies that having an internal compensator in series in a prior art configuration is a prohibitive approach. Embodiments of the present invention therefore aim at providing a simplified solution to the well15 known problems and challenges.
Thus, it will be appreciated that embodiments of the present invention enable the provision of an internal compensator in a “series” system that does not add to the height and weight of the actuator. This greatly increases the likelihood of 20 achieving a weight load that a ROV may handle.
Further, embodiments of the present invention enable monitoring by a sensor of the position of the external compensator of the apparatus. If there occurs a leakage of oil out from the second sub-section or oil-filled chamber, this will be 25 registered as a change of position of the external compensator. When the internal compensator “compensates” for such a leak, the compensation is in turn compensated by the external compensator. Thus, the internal compensator adapts to a reduced oil volume in the second sub-section caused by the leakage. In effect, the total oil volume present in the first and second sub30 section is reduced by the volume of leakage, and movement of the external compensator compensates such reduction when the internal compensator moves to ensure that the second sub-section will still be fully filled with oil. The oil volume in the first sub-section which contacts one face of the internal
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2015318725 22 Jan 2020 compensator will thus remain unchanged due simultaneous movements of both the external compensator and the internal compensator. The internal compensator does not have to be monitored by sensors, as it will be sufficient and more easy to only monitor movement of the external compensator.
Brief description of the drawings
Fig. 1 shows a first embodiment of the retrievable subsea apparatus of the present invention.
Fig. 2 shows a second embodiment of the retrievable subsea apparatus of the present invention.
Fig. 3 shows a third embodiment of the retrievable subsea apparatus of the present invention.
Fig. 4 shows a fourth embodiment of the retrievable subsea apparatus of the 15 present invention.
Fig. 5 shows a fifth embodiment of the retrievable subsea apparatus of the present invention.
Detailed description of preferred embodiments
The five embodiments, which are illustrated, are non-limiting examples of the invention. The embodiment of Fig. 5 is currently the preferred mode of the invention.
In the description to follow, in a series arrangement, the compensator which interfaces the external environment, and controls the first oil-filled sub-section or chamber, is named the “external compensator” 5.
Further, in a series arrangement, in this description, we deal with two oil filled sub-sections or chambers. This does not however limit the scope of this invention to the use of only two sub-sections or chambers. In the description to follow, the compensator which controls this second oil filled sub-section or chamber is named the “internal compensator”.
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It will be appreciated that “at least one first sub-section” and “at least one second sub-section” should be interpreted as implying that more than one of the first and/or second sub-sections could be provided.
Further, the terms “at least one first sub-unit” and “at least one second sub-unit” constituted by the operating unit should be interpreted to imply that more than one of the first and/or second sub-units could be present.
A loss of oil in the first or second sub-section or chamber may be caused by leakages through static or dynamic seals into the environment, or internally between the different sub-sections. Embodiments of the invention enable through the use of the compensators of the apparatus to compensate for such leakages to a certain extent. If the leakages are excessive, the apparatus may require replacement. If the oil volume in a sub-section becomes so low that the operation of the compensator will no longer be sufficient for compensation of leakage. However, the embodiment of Fig. 4 and more so the embodiment of Fig. 5 is able to compensate for a larger loss of oil in the second sub-section than the other embodiments.
In the shown embodiments of the retrievable subsea apparatus 1 they all have a housing T and a penetrator 2, which constitutes an interface between a first section 3 and a second section 4. The first section 3 is sealed off by the penetrator 2 and has a substantially constant first pressure, suitably atmospheric pressure, e.g. sea surface level atmospheric pressure. The first section 2 is a dry chamber filled with air or gas.
The external pressure compensator 5 is associated with the second section 4, which has a second pressure. The second pressure may be equal to or suitably be above subsea pressure surrounding the apparatus housing. Suitably, the external compensator 5 can be pre-tensioned to one side thereof to cause such over-pressure in the second section 4.
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The external pressure compensator 5 is of a type configured to be able to compensate for a volumetric displacement of a first liquid 7 in a sub-section 4’ of the second section 4 to yield a corresponding volumetric change in a second sub-section 4” of the second section 4 via the action by an internal pressure 5 compensator which is in contact with said first liquid 7 and a second liquid 8 in the second sub-section 4”. Thereby, any pressure difference temporarily arising between the pressures in sub-section 4’ and sub-section 4” will be automatically adjusted in order to retain a pressure balance between these two sub-sections.
Specific preferred embodiments of the internal pressure compensator will be explained in more detail below with reference to the drawing figures 1-5, respectively.
The external pressure compensator 5 is configured with one side thereof to be in contact with seawater and with the other side thereof to be in contact with or surrounded by the first liquid 7. The external pressure compensator 5 should be of a material or a composition of materials, which will not deteriorate in contact with seawater and in contact with a selected type of the first liquid 7. Such material is selectable suitably from a metal, a metal alloy, a rubber-type material and a plastics material, and any combination of two or more of these materials could constitute said composition. In a preferred, although non-limiting embodiment of the apparatus, the external pressure compensator 5 is a first bellow open at one end and closed at the other end.
Other types of materials than those mentioned and having similar properties may be used as technical alternatives.
Although the use of a bellow 5 is contemplated in the currently preferred 30 embodiment of the external pressure compensator, other types of pressure compensators with capability of volumetric liquid displacement could be used.
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The inside of the first bellow 5 is in communication with seawater via a perforated wall member 14. The outside and closed end of the first bellow 5 is surrounded by the first liquid 7. The closed end 5’ of the first bellow is linked to or communicates with a bellow movement sensor 15. The sensor 15 is suitably 5 a linear movement sensor, which may be of inductive, capacitive or resistive type.
The control system 9 communicates with the first sub-unit 6’, e.g. an electric motor, via lines 16, and the movement sensor 15 of the external pressure 10 compensator 5, i.e. the first bellow, via lines 17.
At least one first sub-unit 6’ and at least one second sub-unit 6” constitute an operating unit 6. In a specific embodiment, the first sub-unit 6’ comprises an electric motor, and the second sub-unit 6” comprises a gear assembly. The 15 second section 4 is subdivided into at least one first sub-section 4’ and at least one second sub-section 4” which is sealed off from the first section 4’. As seen from the drawings, the first bellow 5 is associated with the first sub-section 4’, the first sub-unit 6’ is at least partly associated with the first sub-section 4’, and the second sub-unit 6” is associated with the second sub-section 4”. As seen 20 from Figs. 1 -5, the first sub-unit 6’ could also at least partly extend with its housing into the second sub-section 4” to be at least partly surrounded a second liquid 8 which is located in the second sub-section 4”.
The first liquid 7, which is located in the first sub-section 4’, has a first set of 25 properties and a second liquid 8, which is located in the second sub-section 4”, has a second set of properties. The first properties are compatible with a structure and operation of the first sub-unit 6’ and the second properties are compatible with a structure and operation of the second sub-unit 6”. The first and second properties are suitably at least one of viscosity, dielectric property, 30 lubrication and materials compatibility. In a currently preferred, although not limiting embodiment, the first liquid 7 has low viscosity and high dielectric properties and could be, as indicated above, e.g. a silicone oil, and the second
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2015318725 22 Jan 2020 liquid 8 has suitably a high viscosity and lubrication properties and could e.g. be a mineral oil or a synthetic or semi-synthetic oil.
The first section 3 contains a control system 9 in communication with external 5 power and communication equipment 10 via said penetrator 2 and cable 11 through the first sub-section 4’ and a watertight connector 12.
The internal pressure compensator mentioned above is configured to adjust for any pressure differences between said first sub-section 4’ and the second sub10 section 4”. The internal pressure compensator is located in or associated with a wall 18 or structural component, which divides or makes an interface wall between the first sub-section 4’ and the second sub-section 4”. The wall 18 is suitably integral with or is in a sealed engagement with a housing of the first sub-unit 6’.
The exemplifying various embodiments of the internal pressure compensator are now to be explained in further detail.
The embodiment of Fig. 1 shows an internal pressure compensator 19, which is 20 a piston movable in a cylindrical hole in the wall 18. It is seen that a first end face of the piston 19 contacts the first liquid 7, and a second end face of the piston 19 contacts the second fluid 8.
The embodiment of Fig. 2 shows an internal pressure compensator 20 which is 25 a diaphragm membrane located transversely of a hole 21 in the wall 18. A first face of the membrane 20 contacts the first liquid 7, and a second face of the membrane 20 contacts the second fluid 8. It is noted that the membrane 20 is located at one axial end of the hole 21. Optionally, a perforated member 22 may be located at the other axial end of the hole and being integral with the wall 18. 30
The embodiment of Fig. 3 shows that the wall 18 has a circular opening 23 radially inwards of its circumference and extending axially through the wall 18. The internal pressure compensator 24 is a diaphragm membrane located
12052130_1 (GHMatters) P105379.AU
2015318725 22 Jan 2020 transversely of the opening 23 at one axial end thereof. Optionally, a perforated circle-shaped member 25 may be located at the other axial end of the opening integrally with the wall 18. A first face of the membrane 24 contacts the first liquid 7, and a second face of the membrane 24 contacts the second fluid 8.
The embodiment of Fig. 4 shows an internal pressure compensator 26, which is a bladder or a second bellow of rubber material being. It is noted that the compensator 26 is substantially located in the first sub-section 4’ and has an outlet 26’ which communicates with an axially extending hole 27 through the wall 18. An interior of the bladder or second bellow 26 is in communication with the second liquid 8 present in the second sub-section 4”. In any case, compared with the embodiments of Figs. 1-3, the compensator 26 which has liquid 8 inside provides for extra supply of oil 8 to the sub-section 4” in case of oil leakage from the sub-section 4” or via the sub-unit 6” by virtue of the bladder or bellows 26 being compressed due to volumetric displacement of the liquid 7 in the sub-section 4’ caused by the bladder 5. Thereby a pressure drop in section 4” is effectively compensated to yield a substantially same pressure in both sub-section 4’, 4”.
Oil leakage of oil 7 from the first sub-section 4’ could be via a first dynamic seal 28, which is present between the first sub-unit 6’ and the second sub-unit 6”. Further, oil leakage of oil 8 could be via a second dynamic seal 29 being present at a downstream region of the second sub-unit 6”.
The embodiment of Fig. 5 shows an internal pressure compensator 30 which is a circular continuous hose of rubber material being substantially located in the first sub-section 4’. The hose 30 has at least one branched-off outlet 31 which engages a hole 32 through the wall 18. An interior of said outlet 31 and hose 30 is in communication with the second liquid 8 present in the second sub-section
4”. The volume of the hose 30 implies that there is an extra supply of oil 8 available in case of excessive oil leakage of oil 8 to the outside of the apparatus
1. However, it will be appreciated that the oil which can be pressed out of the hose is very much dependent on the volume of oil 7 which the bellow 5 is able
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2015318725 22 Jan 2020 to cause a corresponding volume compression onto the hose 30 to yield a corresponding volume of oil 8 to leave the inside of the hose 30 and into the second sub-section, thereby providing for the required pressure compensation.
Suitably, the hose 30 resides with a part of its body in a recess of a face of the wall 18 in the first sub-section 4’.
As indicated above, an exemplifying use of the inventive apparatus 1 could be to operate or adjust the state of a subsea installation 33 by letting a movable connector 34 at a downstream region of the second sub-unit 6” engage a moveable mating connector 35 on the subsea installation, see Fig. 1.
Although the first and second sub-units 6’; 6” could be an electric motor and a gear assembly, respectively, such a choice should not be considered to limit the present invention, as other choices could be made.
It is to be understood that, if any prior art publication is referred to herein, such reference does not constitute an admission that the publication forms a part of the common general knowledge in the art, in Australia or any other country.
In the claims which follow and in the preceding description of the invention, except where the context requires otherwise due to express language or necessary implication, the word “comprise” or variations such as “comprises” or “comprising” is used in an inclusive sense, i.e. to specify the presence of the stated features but not to preclude the presence or addition of further features in various embodiments of the invention.
Claims (21)
- Patent claims1. A retrievable subsea apparatus with a pressure and volume compensating system, the apparatus comprising:- a housing having in its interior a control system located in a first section thereof and an operating unit located in a second section thereof, wherein- a penetrator constitutes an interface between the first section and the second section, wherein the first section has a substantially constant first pressure,- that an external pressure compensator is associated with the second section having a second pressure,- that at least a first sub-unit and at least a second sub-unit constitute the operating unit,- that at least a first sub-section and at least a second sub-section constitute the second section,- that a first liquid is located in the first sub-section, and a second liquid is located in the second sub-section,- that the second sub-section is sealed off from the first sub-section,- that the external compensator is in communication with the first subsection,- that the first sub-unit is at least partly associated with the first subsection and the second sub-unit is associated with the second subsection, and- that an internal pressure compensator is configured to adjust for any pressure differences between said first and second sub-sections and is in contact with the first liquid in the first sub-section and with the second liquid in the second sub-section.
- 2. The apparatus of claim 1, wherein the first liquid has a first set of properties, and wherein the second liquid has a second set of properties, the12052130_1 (GHMatters) P105379.AU first and second properties are at least one of viscosity, dielectric property, lubrication and materials compatibility.
- 3. The apparatus of claim 1 or 2, wherein the external pressure compensator is pre-tensioned to one side to yield a pressure in the second section above an external pressure, e.g. a subsea pressure.
- 4. The apparatus of any one of claims 1 - 3, wherein the external compensator is linked to or communicates with a compensator movement sensor.
- 5. The apparatus of any one of claims 1-4, wherein the external pressure compensator is a first bellow open at one end and closed at the other end, the inside of the first bellow to be in communication with sea water, and wherein the outside and closed end of the first bellow being surrounded by the first liquid.
- 6. The apparatus of any one of claims 1-5, wherein the external pressure compensator is linked to or communicates with a movement sensor.
- 7. The apparatus of any one of claims 1-6, wherein the control system communicates with external power and communication equipment via said penetrator and the first sub-section.
- 8. The apparatus of any one of claims 1-7, wherein the control system communicates with the first sub-unit, e.g. a motor, and a movement sensor of the external pressure compensator.
- 9. The apparatus of any one of claims 1-8, wherein the internal pressure compensator is located in or associated with a wall or component which divides the first sub-section and the second sub-section.12052130_1 (GHMatters) P105379.AU2015318725 22 Jan 2020
- 10. The apparatus of claim 9, wherein the wall between said first and second sub-sections is integral with or is in a sealed engagement with a housing of the first sub-unit.5
- 11. The apparatus of any one of claims 1-10, wherein the internal pressure compensator is a piston movable in a cylindrical hole in the wall, and wherein a first end face of the piston contacts the first liquid, and a second end face of the piston contacts the second fluid.10
- 12. The apparatus of any one of claims 1 -11, wherein the internal pressure compensator is a diaphragm membrane located transversely of a hole in the wall, and wherein a first face of the membrane contacts the first liquid, and a second end face of the membrane contacts the second fluid.15
- 13. The apparatus of claim 12, wherein a perforated member is located at the other axial end of the hole and being integral with the wall.
- 14. The apparatus of any one of claims 1-13, wherein the wall has a circle shaped opening radially inwards of its circumference and extending20 axially through the wall, wherein the internal pressure compensator is a diaphragm membrane which is located transversely of the opening at one axial end thereof, wherein a first face of the membrane contacts the first liquid, and wherein a second face of the membrane contacts the second fluid.25
- 15. The apparatus of claims 14, wherein a perforated member is located at the other axial end of the opening integrally with the wall.
- 16. The apparatus of any one of claims 1 -11, wherein the internal pressure compensator is a bladder or a second bellow of rubber material being 30 substantially located in the first sub-section and having an outlet which communicates with an axially extending hole through the wall, an interior of said bladder or second bellow being in communication with the second liquid present in the second sub-section.12052130_1 (GHMatters) P105379.AU
- 17. The apparatus of any one of claims 1 -11, wherein the internal pressure compensator is a circular continuous hose of rubber material being substantially located in the first sub-section, wherein the hose has at least one branched-off outlet which engages a hole through the wall, an interior of said outlet and hose being in communication with the second liquid present in the second sub-section.
- 18. The apparatus of any one of claims 1-17, wherein at least one of the first and second liquids is a mineral oil, a synthetic or semi-synthetic oil or a silicone oil.
- 19. The apparatus of any one of claims 1-18, wherein the first section is a dry chamber filled with air or gas.
- 20. The apparatus of any one of claims 1-19, wherein a first dynamic seal is present between the first sub-unit and the second sub-unit, and wherein a second dynamic seal is present at a downstream region of the second subunit.
- 21. Usage of an apparatus according to any one of claims 1 - 20 to operate or adjust the state of a subsea installation by letting a movable connector at a downstream region of the second sub-unit engage a moveable mating connector on the installation.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO20141138 | 2014-09-19 | ||
| NO20141138A NO338854B1 (en) | 2014-09-19 | 2014-09-19 | A REQUIRED UNDERWATER DEVICE WITH A PRESSURE AND VOLUME COMPENSATING SYSTEM |
| PCT/NO2015/050164 WO2016043600A1 (en) | 2014-09-19 | 2015-09-17 | A retrievable subsea apparatus with a pressure and volume compensating system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2015318725A1 AU2015318725A1 (en) | 2017-03-23 |
| AU2015318725B2 true AU2015318725B2 (en) | 2020-03-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2015318725A Active AU2015318725B2 (en) | 2014-09-19 | 2015-09-17 | A retrievable subsea apparatus with a pressure and volume compensating system |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20170306715A1 (en) |
| AU (1) | AU2015318725B2 (en) |
| BR (1) | BR112017003994B1 (en) |
| GB (1) | GB2544688B (en) |
| NO (1) | NO338854B1 (en) |
| WO (1) | WO2016043600A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO346201B1 (en) * | 2020-06-23 | 2022-04-19 | Vetco Gray Scandinavia As | Electrical actuator |
| GB2613797A (en) * | 2021-12-14 | 2023-06-21 | Siemens Energy AS | Electrical coupling |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5166677A (en) * | 1990-06-08 | 1992-11-24 | Schoenberg Robert G | Electric and electro-hydraulic control systems for subsea and remote wellheads and pipelines |
| US20020175303A1 (en) * | 2002-02-14 | 2002-11-28 | Vijay Chatufale | Hydraulic actuator with built-in pressure compensator |
| US20050178560A1 (en) * | 2004-02-18 | 2005-08-18 | Fmc Technologies, Inc. | System for controlling a hydraulic actuator, and methods of using same |
| US20140147299A1 (en) * | 2010-06-22 | 2014-05-29 | Vetco Gray Scandinavia As | Compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO313068B1 (en) * | 2000-11-14 | 2002-08-05 | Abb As | Underwater transformer - distribution system with a first and a second chamber |
| US7216714B2 (en) * | 2004-08-20 | 2007-05-15 | Oceaneering International, Inc. | Modular, distributed, ROV retrievable subsea control system, associated deepwater subsea blowout preventer stack configuration, and methods of use |
| NO322680B1 (en) * | 2004-12-22 | 2006-11-27 | Fmc Kongsberg Subsea As | System for controlling a valve |
| BRPI0520625A2 (en) * | 2005-10-19 | 2009-05-19 | Cameron Int Corp | underwater equipment |
| US8686681B2 (en) * | 2006-05-26 | 2014-04-01 | Oceaneering As | Power supply apparatus for electronic,electrical, and electromechanical installations |
| WO2008055515A1 (en) * | 2006-11-06 | 2008-05-15 | Siemens Aktiengesellschaft | Variable speed drive for subsea applications |
| EP2169690B1 (en) * | 2008-09-24 | 2012-08-29 | ABB Technology AG | Pressure compensator |
| WO2011088840A1 (en) * | 2010-01-19 | 2011-07-28 | Siemens Aktiengesellschaft | Subsea pressure compenstion system |
| NO333696B1 (en) * | 2010-12-17 | 2013-08-26 | Vetco Gray Scandinavia As | System and method for instantaneous hydrostatic operation of hydrodynamic axial bearings in a vertical fluid set-off module |
| EP2610881B1 (en) * | 2011-12-28 | 2014-04-30 | Siemens Aktiengesellschaft | Pressure compensator for a subsea device |
| US9222555B2 (en) * | 2012-08-06 | 2015-12-29 | Cameron International Corporation | Linear actuator |
-
2014
- 2014-09-19 NO NO20141138A patent/NO338854B1/en unknown
-
2015
- 2015-09-17 BR BR112017003994-0A patent/BR112017003994B1/en active IP Right Grant
- 2015-09-17 US US15/512,482 patent/US20170306715A1/en not_active Abandoned
- 2015-09-17 GB GB1703364.8A patent/GB2544688B/en active Active
- 2015-09-17 AU AU2015318725A patent/AU2015318725B2/en active Active
- 2015-09-17 WO PCT/NO2015/050164 patent/WO2016043600A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5166677A (en) * | 1990-06-08 | 1992-11-24 | Schoenberg Robert G | Electric and electro-hydraulic control systems for subsea and remote wellheads and pipelines |
| US20020175303A1 (en) * | 2002-02-14 | 2002-11-28 | Vijay Chatufale | Hydraulic actuator with built-in pressure compensator |
| US20050178560A1 (en) * | 2004-02-18 | 2005-08-18 | Fmc Technologies, Inc. | System for controlling a hydraulic actuator, and methods of using same |
| US20140147299A1 (en) * | 2010-06-22 | 2014-05-29 | Vetco Gray Scandinavia As | Compensated barrier and lubrication fluids pressure regulation system for a subsea motor and pump module |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2015318725A1 (en) | 2017-03-23 |
| GB2544688A (en) | 2017-05-24 |
| GB2544688B (en) | 2020-09-02 |
| NO338854B1 (en) | 2016-10-24 |
| NO20141138A1 (en) | 2016-03-21 |
| GB201703364D0 (en) | 2017-04-19 |
| WO2016043600A1 (en) | 2016-03-24 |
| BR112017003994A2 (en) | 2018-02-20 |
| US20170306715A1 (en) | 2017-10-26 |
| BR112017003994B1 (en) | 2022-07-12 |
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| FGA | Letters patent sealed or granted (standard patent) |