CA2205258A1 - Gas dome for a tank - Google Patents
Gas dome for a tankInfo
- Publication number
- CA2205258A1 CA2205258A1 CA 2205258 CA2205258A CA2205258A1 CA 2205258 A1 CA2205258 A1 CA 2205258A1 CA 2205258 CA2205258 CA 2205258 CA 2205258 A CA2205258 A CA 2205258A CA 2205258 A1 CA2205258 A1 CA 2205258A1
- Authority
- CA
- Canada
- Prior art keywords
- tank
- gas
- gas phase
- conduit
- accumulation section
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/01—Shape
- F17C2201/0104—Shape cylindrical
- F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/03—Orientation
- F17C2201/035—Orientation with substantially horizontal main axis
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/054—Size medium (>1 m3)
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0341—Filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2221/00—Handled fluid, in particular type of fluid
- F17C2221/03—Mixtures
- F17C2221/032—Hydrocarbons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
- F17C2223/0146—Two-phase
- F17C2223/0153—Liquefied gas, e.g. LPG, GPL
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
- F17C2223/033—Small pressure, e.g. for liquefied gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/031—Treating the boil-off by discharge
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention is directed at an improved tank for containing a fluid having a gas phase and comprising an outer wall and a gas accumulation section.
The gas phase accumulates generally upwardly in the gas accumulation section forremoval. The improvement is comprised of a conduit having a first end within thegas accumulation section and a second end extending through the outer wall of the tank at or below the level of the gas accumulation section for directing the gas phase out of the tank. A valve is associated with the second end of the conduit for controlling the release of the gas phase through the second end. Preferably, the gas phase is directed by the conduit from the gas accumulation section generally downwardly for release through the second end. Further, the gas accumulation section is preferably comprised of a gas dome.
The gas phase accumulates generally upwardly in the gas accumulation section forremoval. The improvement is comprised of a conduit having a first end within thegas accumulation section and a second end extending through the outer wall of the tank at or below the level of the gas accumulation section for directing the gas phase out of the tank. A valve is associated with the second end of the conduit for controlling the release of the gas phase through the second end. Preferably, the gas phase is directed by the conduit from the gas accumulation section generally downwardly for release through the second end. Further, the gas accumulation section is preferably comprised of a gas dome.
Description
CA 0220~2~8 1997-0~-13 GAS DOME FOR A TANK
TECHNICAL FIELD
The present invention relates to a tank for containing a fluid having a gas phase, the tank comprising a gas accumulation section for accumulating the gas phase generally upwardly therein for removal from the tank. Preferably, the gas phase is removed from the gas accumulation section in a generally downward direction.
Further, the gas accumulation section is preferably comprised of a gas dome.
BACKGROUND ART
Various production tanks have been designed to provide for the separation of either two phases or three phases of a fluid. For instance, in the oil and gas industry, wellbore fluid often includes a liquid phase, comprised primarily of oil and water, and a gas phase. In order to separate the liquid phase of the fluid from the gas phase, two phase separators are typically used. Further, in order to separate the gas phase and the oil and water comprising the liquid phase, three phase separators, such as free water knockouts and treaters, are used.
These conventional production tanks, i.e. two or three phase separators may or may not be pressurized. However, two phase separators and treaters are usually pressurized, while free water knockouts may or may not be depending upon the particular use. Where pressurized, these tanks usually operate in a range of about 40 to 50 psi. Thus, most conventional tanks are comprised of a pressure vessel or pressure tank.
Further, conventional tanks typically include an inlet for conducting the fluid into the tank and two, three or more outlets for removing the various phases of the fluid from the tank. In particular, the gas phase tends to accumulate generally upwardly in a gas accumulation section or zone, where it may be removed from thetank. The gas accumulation section of these tanks is typically comprised of a gas dome, which communicates with the tank, such that the gas phase accumulates in the gasdome for removal from the tank. A valve, typically a back pressure valve, communicates or is associated with the gas dome for controlling the release of the gas phase from the gas dome. The gas dome is typically mounted on an uppermost surface of the tank given the natural tendency of the gas phase to rise and accumulate CA 0220~2~8 1997-0~-13 generally upwardly. Further, the valve tends to be located at or on the uppermost surface of the gas dome. Thus, the gas phase tends to be removed from the gas accumulation section in a generally upward direction.
It has been found that during the transportation of tanks having a gas dome, the overall height of the tank may present problems or cause difficulties when low level structures, such as tunnels or overlying bridges, are encountered. This problem is intensified where the gas dome includes a top mounted pressure valve,which tends to add significantly to the overall height of the gas dome, and thus, the tank.
There is therefore a need in the industry for a gas accumulation section in a tank which reduces, or does not significantly add to, the overall height of the tank as compared to tanks comprising conventional gas accumulation sections. Further, there is a need for a gas accumulation section comprised of a gas dome which has a reduced height from that of conventional gas domes.
DISCLOSURE OF INVENTION
The present invention relates to a tank for containing a fluid having a gas phase, the tank comprising a gas accumulation section for accumulating the gas phase generally upwardly therein for removal from the tank. Once accumulated in the gas accumulation section, the gas phase is preferably removed from the gas accumulation section in a generally downward direction.
Further, the present invention relates to a gas accumulation section in the tank which reduces, or does not significantly add to, the overall height of the tank as compared to tanks comprising conventional gas accumulation sections. As well, the present invention relates to a gas accumulation section comprised of a gas dome which has a reduced height from that of conventional gas domes.
In one aspect of the invention, the invention is comprised of a tank for containing a fluid having a gas phase, the tank comprising an outer wall and a gas accumulation section wherein the gas phase accumulates generally upwardly in the gas accumulation section for removal from the tank, the improvement which comprises:
CA 0220~2~8 1997-0~-13 (a) a conduit having a first end within the gas accumulation section for communicating with the gas phase and a second end extending through the outer wall of the tank at the level of the gas accumulation section or at a level below the gas accumulation section for directing the gas phase out of the tank; and (b) a valve associated with the second end of the conduit for controlling the release of the gas phase through the second end.
The gas phase is preferably directed by the conduit from the gas accumulation section generally downwardly for release through the second end of the conduit. The conduit may be comprised of any channel, conduit, pipe or like structure suitable for directing the gas phase therethrough from the first end to the second end.
Further, the conduit may be comprised of one or more portions or components, however, the conduit is preferably comprised of at least two portions connected together such that the gas phase is conducted through the conduit from the first end to the second end. In the preferred embodiment, the conduit is comprised of a first portion and a second portion. The first portion extends generally downwardly from the first end for connection to the second portion and the second portion extends from the first portion to the second end.
The tank may be comprised of any suitable tank compatible with the functions and the purpose of the tank as described herein and capable of containing a fluid having a gas phase. The tank is preferably substantially sealed such that substantially all of the gas phase is released through the second end of the conduit. In the preferred embodiment, the tank is a pressure vessel.
The gas accumulation section may be comprised of any structure, apparatus, device, container, mechanism or the like suitable for, and compatible with the generally upward accumulation of the gas phase therein. In the preferred embodiment, the gas accumulation section is comprised of a gas dome. The gas dome may be of any type suitable for, and compatible with the intended purpose of the gas dome as described herein, and particularly, for the generally upward accumulation of the gas phase.
CA 0220~2~8 1997-0~-13 The gas dome is preferably comprised of an upper section and a lower section, wherein the conduit extends through the lower section and the first end of the conduit communicates with the upper section such that the gas phase is directed by the conduit out of the upper section of the gas dome. Further, the gas dome may be further 5 comprised of a filter between the upper section and the lower section for filtering the gas phase as the gas phase accumulates in the upper section from the lower section.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a pictorial side view of a preferred embodiment of the tank comprised of a gas dome; and Figure 2 is a pictorial end view of the tank taken from line 2-2 of Figure 1.
BEST MODE OF CARRYING OUT INVENTION
Referring to Figures 1 and 2, the present invention is directed at a tank (20) for containing a fluid having at least a gas phase. Thus, the tank (20) is connected to a supply of fluid such as a hydrocarbon producing well or a mineral oil production or processing site. Typically, the fluid includes a gas phase and a liquid phase. The fluid entering the apparatus may or may not be pressurized, but preferably the fluid contained in the tank (20) is pressurized. The liquid phase may include one or more liquids, and typically is comprised of oil and water. Given the differences in the specific densities of the gas phase and the liquid phase, the phases tend to naturally separate such that the gas phase rises within the tank (20) above the liquid phase. In other words, the gas phase naturally tends to accumulate generally upwardly in the tank (20) or towards the uppermost surface of the tank (20) as described further below.
The tank (20) may be of any type, size or configuration suitable for containing the specific fluid to be contained therein. In the preferred embodiment, for use in the oil and gas industry, the tank (20) is a production tank. Any suitable production tank (20) compatible with its intended use may be used. Various production tanks have been designed to provide for the separation of either two phases or three phases of a fluid. For instance, in the oil and gas industry, in order to separate CA 0220~2~8 1997-0~-13 the liquid phase of the fluid from the gas phase, two phase separators are typically used.
Further, in order to separate the gas phase and the oil and water comprising the liquid phase, three phase separators, such as free water knockouts and treaters, are used.
Thus, in the preferred embodiment, the production tank (20) may be a separator, a 5 treater or a free water knockout.
The production tank (20) is preferably sealed or sealable such that the tank (20) is gas tight. Thus, the gas phase is retained within the tank (20) and is not released therefrom except when desired by the operator of the tank (20). More specifically, the 10 tank (20) is substantially sealed so that substantially all of the gas phase contained within the tank (20) may exit the tank (20) only through one or more specific gas outlets provided for in the tank (20), as described further below.
Further, the tank (20) may or may not be pressurized, as required or 15 desired for any particular use of the tank (20). In the preferred embodiment, the tank (20) is comprised of a pressure vessel, being gas tight and capable of withstanding a required maximum pressure, from atmospheric pressure to any desired operating pressure. Thus, pressurized fluid may be contained within the tank (20). Preferably, the tank (20) is capable of operating at any pressure to a maximum of about 75 psi.
As stated, any shape or configuration of the tank (20) compatible with, and suitable for, its intended use and function, as described herein, may be used. However, the tank (20) is preferably cylindrical and has an outer wall (22), a first end (24), a second end (26) and a longitudinal axis extending between the first and second ends (24, 26). In 25 the preferred embodiment, the longitudinal axis of the tank (20) is oriented to be substantially horizontal. The tank (20) further includes a top (28) defined by the uppermost surface or area of the tank outer wall (22) and an opposing bottom (30) defined by the lowermost surface or area of the outer wall (22).
Further, the tank (20) includes at least one inlet for conducting the fluid into the tank (20) and two, three or more outlets for removing the various phases of the fluid from the tank (20). In the preferred embodiment, an inlet (32) communicates with the tank (20) such that the fluid may be directed into the tank (20) through the inlet (32). The inlet (32) is connectable to, or communicates directly or indirectly with, the supply of fluid. Preferably, the connection is sealed by a gasket or other suitable device in order to prevent the release of any fluid through the connection. The inlet CA 0220~2~8 1997-0~-13 (40) may communicate with the tank (20) at any location in the outer wall (22) of the tank (20) which is readily accessible and permits connection to the fluid supply.
As stated, the tank (20) is further comprised of two, three or more outlets 5 for removing the various phases of the fluid from the tank (20). Any number of each of these outlets may be present in the tank (20) depending upon the composition and volume of the fluid. These outlets include at least one outlet for removing the gas phase and at least one outlet for removing the liquid phase of the fluid. Each of these outlets communicate with the tank (20) through the outer wall (22) of the tank (20).
10 Further, each of these outlets may be located at any suitable location compatible with the function of the particular outlet which permits the removal of the particular fluid phase therethrough. The liquid phase passing out of the tank (20) through the liquid phase outlet or outlets may be directed to a suitable storage facility (not shown) or for further treatment and production.
Further, the tank (20) is comprised of a gas accumulation section for accumulating the gas phase as it naturally rises and tends to accumulate generally upwardly in the tank (20). The gas accumulation section (35) may be comprised of a portion, section, area or zone of the tank (20) or it may be comprised of any suitable 20 container, vessel, compartment or the like comprising the tank (20) such that the gas accumulation section (35) communicates with the remainder of the tank (20). The gas accumulation section (35) may be located in any suitable location or position which allows or permits the gas phase to accumulate generally upwardly therein. In thepreferred embodiment, where the tank (20) is substantially horizontal, the gas 25 accumulation section (35) is located at, adjacent or in close proximity to the top (28) of the tank (20).
The gas phase is accumulated in the gas accumulation section (35) for removal therefrom thorough a gas phase outlet. The gas phase outlet is preferably 30 comprised of the structure described below for directing the gas phase out of the gas accumulation section (35) and the tank (20). The gas phase removed from the gas accumulation section (35) may be directed to a suitable storage or treatment facility (not shown) or gas flare stack or pit (not shown) as desired.
The tank (20) is further comprised of a conduit (36) for directing the gas phase from the gas accumulation section (35) out of the tank (20) through the outer wall (22) of the tank (20). The gas phase is directed out of the tank (20) through the CA 0220~2~8 1997-0~-13 outer wall (22) at the level of the gas accumulation section (35) or at a level below the gas accumulation section (35) such that the gas phase is directed generally downwardly by the conduit (36). In the preferred embodiment, where the gas accumulation section (35) is located at, adjacent or in proximity to the top (28) of the tank (20), the gas phase 5 may be directed out of the tank (20) at the level of the gas accumulation section (35) so that the gas phase is released through the outer wall (22) at a position or location at, or adjacent to, the gas accumulation section (35). Alternately, the gas phase may be directed out of the tank (20) at a level below the gas accumulation section (35) so that the gas phase is released through the outer wall (22) at a position or location in the 10outer wall (22) nearer or closer to the bottom (30) of the tank (20) than the gas accumulation section (35). In either event, the conduit (36) is aligned or oriented in a manner or in a direction such that the gas phase is directed generally downwardly through the conduit (36).
15More particularly, the conduit (36) is comprised of a first end (38) and a second end (40). The first end (38) is within the gas accumulation section (35) for communication with the gas phase. Thus, the gas phase is permitted to pass from the gas accumulation section (35) into the conduit (36) through the first end (38). The second end (40) extends through the outer wall (22) of the tank (20) at the level of the 20 gas accumulation section (35) or at a level below the gas accumulation section (35).
More particularly, the gas phase is directed by the conduit (36) from the gas accumulation section (35), through the first end (38), generally downwardly for release through the second end (40) of the conduit (36). As stated above, the tank (20) is preferably sealed so that substantially all of the gas phase is released through the second 25 end (40) of the conduit (36).
Thus, the gas phase naturally tends to accumulate generally upwardly in the gas accumulation section (35), where it is directed generally downwardly through the conduit (36) for release from the tank (20). In conventional gas accumulation 30 sections (35), the gas phase is released from the gas accumulation section (35) and the tank (20) in an upward direction above the level of the gas accumulation section (35), which tends to add to the overall height of the tank (20). By redirecting the gas phase from the gas accumulation section (35) to a level at or below the gas accumulation section (35), the height of the tank (20) may be reduced from that of conventional tanks 35 (20).
CA 0220~2~8 1997-0~-13 The conduit (36) may be comprised of any conduit, channel, tunnel, pipe or the like suitable for, and capable of, directing or conducting the gas phase of the fluid therethrough. Further, the conduit (36) may be comprised of any suitable material compatible with the nature of the gas phase directed therein. As well, the conduit (36) 5 may be of any suitable shape, size or configuration. Finally, the conduit (36) may be comprised of one or more portions, each portion being individually oriented or aligned in any manner or direction so long as the gas phase is directed generally downwardly from the first end (38) to the second end (40).
The conduit (36) is preferably comprised of at least two portions connected or joined together in any suitable manner permitting the gas phase to pass through the conduit (36), or to be conducted therein, from the first end (38) to the second end (40).
Alternately, the conduit (36) may be a single piece or length, which is bent to form the various portions thereof. In the preferred embodiment, the conduit (36) is comprised of a first portion (44) and a second portion (46). Further, the second end (40) preferably extends through the outer wall (22) at a level below the gas accumulation section (35).
The first portion (44) extends generally downwardly from the first end (38) for connection to the second portion (46). The second portion (46) extends from the first portion (44) to the second end (40). the portions (44, 46) may be connected together by any suitable device, structure, apparatus, mechanism or the like permitting the gas phase to pass from the first portion (44) to the second portion (46). In the preferred embodiment, the portions (44, 46) are connected by an elbow portion (48) which permits the first and second portions (44, 46) to be aligned in different planes or to extend in different directions. Preferably, the first portion (44) is located in a substantially vertical plane and extends from within the gas accumulation section (35) to a position outside the gas accumulation section (35), below the gas accumulation section (35). In other words, the first portion (44) extends from the first end (38) to a position or location nearer or closer to the bottom (30) of the tank (20) than the gas accumulation section (35). Preferably, the second portion (46) is located in a substantially horizontal plane and extends from the first portion (44) to the second end (40) outside of the outer wall (22) of the tank (20). Thus, the elbow portion (48) connecting the first and second portions (44, 46) forms substantially a 90 degree angle.
A valve (50) is preferably associated with the second end (40) of the conduit (36) for controlling the release of the gas phase through the second end (40).
The valve (50) is preferably located within the outer wall (22) or outside of the outer CA 0220~2~8 1997-0~-13 wall (22) so that it may be accessed from outside the tank (20). Preferably, the valve (50) is comprised of a back pressure valve (50). The back pressure valve (50) may be any conventional valve or device for maintaining a desired pressure in the tank (20) such as a weight loaded, spring loaded or pilot operated gas back pressure valve. The5 pressure setting of the back pressure valve (50) is preferably variable so that it may be set by the operator of the tank (20) depending upon the desired flow rate of the fluid into the tank (20) and the desired flow rate of the gas phase out of the second end (40) of the conduit (36). A further transportation conduit (52) or pipe may then be connected to the valve (50) on the opposite side from the conduit (36) so that the gas phase may be 10 directed or transported to a suitable storage or treatment facility (not shown) or gas flare stack or pit (not shown) as desired.
The gas accumulation section (35) of the tank (20) is preferably comprised of a gas dome (52), which communicates with the tank (20), such that the gas phase accumulates in the gas dome (52) for removal from the tank (20). The gas dome (52) may be of any type, size or configuration suitable for use with the particular gas phase in the tank (20) and may be comprised of any vessel, container, structure or the like suitable for accumulating the gas phase therein. The gas dome (52) is preferablymounted at, adjacent or in close proximity to the top (28) of the tank (20) given the 20 natural tendency of the gas phase to rise and accumulate generally upwardly. In the preferred embodiment, the gas dome (52) is located on the top (28) of the tank (20) or at its uppermost surface.
Further, the gas dome (52) is preferably comprised of an upper section (54) 25 and a lower section (56). The gas phase tends to rise within the gas dome (52) and naturally accumulate towards the upper section (54). As a result, the conduit (36) preferably extends through the lower section (56) and the first end (38) of the conduit (36) preferably communicates with the upper section (54). Thus, the gas phase isdirected by the conduit (36) out of the upper section (54) of the gas dome (52). More 30 particularly, in the preferred embodiment, the first portion (44) of the conduit (36) extends from the first end (38), within the upper section (54) of the gas dome (52), through the lower section (56) of the gas dome (52) and out of the gas dome (52)completely for connection to the elbow portion (48) of the conduit (36).
Finally, the gas dome (52) may be further comprised of a filter (58) located or positioned between the upper section (54) and the lower section (56) of the gas dome (52) for filtering the gas phase as the gas phase passes therethrough and accumulates in g CA 0220~2~8 1997-0~-13 the upper section (54) from the lower section (56). The filter (58) may be of any type suitable for, and compatible with, filtering the particular gas phase passing therethrough in order to remove any components or elements of the gas phase desired to be removed by the operator of the tank (20). Further, the filter (58) preferably 5 provides a substantially complete barrier between the upper and lower sections (54, 56) such that substantially all of the gas phase entering the first end (38) of the conduit (36) has been filtered.
TECHNICAL FIELD
The present invention relates to a tank for containing a fluid having a gas phase, the tank comprising a gas accumulation section for accumulating the gas phase generally upwardly therein for removal from the tank. Preferably, the gas phase is removed from the gas accumulation section in a generally downward direction.
Further, the gas accumulation section is preferably comprised of a gas dome.
BACKGROUND ART
Various production tanks have been designed to provide for the separation of either two phases or three phases of a fluid. For instance, in the oil and gas industry, wellbore fluid often includes a liquid phase, comprised primarily of oil and water, and a gas phase. In order to separate the liquid phase of the fluid from the gas phase, two phase separators are typically used. Further, in order to separate the gas phase and the oil and water comprising the liquid phase, three phase separators, such as free water knockouts and treaters, are used.
These conventional production tanks, i.e. two or three phase separators may or may not be pressurized. However, two phase separators and treaters are usually pressurized, while free water knockouts may or may not be depending upon the particular use. Where pressurized, these tanks usually operate in a range of about 40 to 50 psi. Thus, most conventional tanks are comprised of a pressure vessel or pressure tank.
Further, conventional tanks typically include an inlet for conducting the fluid into the tank and two, three or more outlets for removing the various phases of the fluid from the tank. In particular, the gas phase tends to accumulate generally upwardly in a gas accumulation section or zone, where it may be removed from thetank. The gas accumulation section of these tanks is typically comprised of a gas dome, which communicates with the tank, such that the gas phase accumulates in the gasdome for removal from the tank. A valve, typically a back pressure valve, communicates or is associated with the gas dome for controlling the release of the gas phase from the gas dome. The gas dome is typically mounted on an uppermost surface of the tank given the natural tendency of the gas phase to rise and accumulate CA 0220~2~8 1997-0~-13 generally upwardly. Further, the valve tends to be located at or on the uppermost surface of the gas dome. Thus, the gas phase tends to be removed from the gas accumulation section in a generally upward direction.
It has been found that during the transportation of tanks having a gas dome, the overall height of the tank may present problems or cause difficulties when low level structures, such as tunnels or overlying bridges, are encountered. This problem is intensified where the gas dome includes a top mounted pressure valve,which tends to add significantly to the overall height of the gas dome, and thus, the tank.
There is therefore a need in the industry for a gas accumulation section in a tank which reduces, or does not significantly add to, the overall height of the tank as compared to tanks comprising conventional gas accumulation sections. Further, there is a need for a gas accumulation section comprised of a gas dome which has a reduced height from that of conventional gas domes.
DISCLOSURE OF INVENTION
The present invention relates to a tank for containing a fluid having a gas phase, the tank comprising a gas accumulation section for accumulating the gas phase generally upwardly therein for removal from the tank. Once accumulated in the gas accumulation section, the gas phase is preferably removed from the gas accumulation section in a generally downward direction.
Further, the present invention relates to a gas accumulation section in the tank which reduces, or does not significantly add to, the overall height of the tank as compared to tanks comprising conventional gas accumulation sections. As well, the present invention relates to a gas accumulation section comprised of a gas dome which has a reduced height from that of conventional gas domes.
In one aspect of the invention, the invention is comprised of a tank for containing a fluid having a gas phase, the tank comprising an outer wall and a gas accumulation section wherein the gas phase accumulates generally upwardly in the gas accumulation section for removal from the tank, the improvement which comprises:
CA 0220~2~8 1997-0~-13 (a) a conduit having a first end within the gas accumulation section for communicating with the gas phase and a second end extending through the outer wall of the tank at the level of the gas accumulation section or at a level below the gas accumulation section for directing the gas phase out of the tank; and (b) a valve associated with the second end of the conduit for controlling the release of the gas phase through the second end.
The gas phase is preferably directed by the conduit from the gas accumulation section generally downwardly for release through the second end of the conduit. The conduit may be comprised of any channel, conduit, pipe or like structure suitable for directing the gas phase therethrough from the first end to the second end.
Further, the conduit may be comprised of one or more portions or components, however, the conduit is preferably comprised of at least two portions connected together such that the gas phase is conducted through the conduit from the first end to the second end. In the preferred embodiment, the conduit is comprised of a first portion and a second portion. The first portion extends generally downwardly from the first end for connection to the second portion and the second portion extends from the first portion to the second end.
The tank may be comprised of any suitable tank compatible with the functions and the purpose of the tank as described herein and capable of containing a fluid having a gas phase. The tank is preferably substantially sealed such that substantially all of the gas phase is released through the second end of the conduit. In the preferred embodiment, the tank is a pressure vessel.
The gas accumulation section may be comprised of any structure, apparatus, device, container, mechanism or the like suitable for, and compatible with the generally upward accumulation of the gas phase therein. In the preferred embodiment, the gas accumulation section is comprised of a gas dome. The gas dome may be of any type suitable for, and compatible with the intended purpose of the gas dome as described herein, and particularly, for the generally upward accumulation of the gas phase.
CA 0220~2~8 1997-0~-13 The gas dome is preferably comprised of an upper section and a lower section, wherein the conduit extends through the lower section and the first end of the conduit communicates with the upper section such that the gas phase is directed by the conduit out of the upper section of the gas dome. Further, the gas dome may be further 5 comprised of a filter between the upper section and the lower section for filtering the gas phase as the gas phase accumulates in the upper section from the lower section.
BRIEF DESCRIPTION OF DRAWINGS
Embodiments of the invention will now be described with reference to the accompanying drawings, in which:
Figure 1 is a pictorial side view of a preferred embodiment of the tank comprised of a gas dome; and Figure 2 is a pictorial end view of the tank taken from line 2-2 of Figure 1.
BEST MODE OF CARRYING OUT INVENTION
Referring to Figures 1 and 2, the present invention is directed at a tank (20) for containing a fluid having at least a gas phase. Thus, the tank (20) is connected to a supply of fluid such as a hydrocarbon producing well or a mineral oil production or processing site. Typically, the fluid includes a gas phase and a liquid phase. The fluid entering the apparatus may or may not be pressurized, but preferably the fluid contained in the tank (20) is pressurized. The liquid phase may include one or more liquids, and typically is comprised of oil and water. Given the differences in the specific densities of the gas phase and the liquid phase, the phases tend to naturally separate such that the gas phase rises within the tank (20) above the liquid phase. In other words, the gas phase naturally tends to accumulate generally upwardly in the tank (20) or towards the uppermost surface of the tank (20) as described further below.
The tank (20) may be of any type, size or configuration suitable for containing the specific fluid to be contained therein. In the preferred embodiment, for use in the oil and gas industry, the tank (20) is a production tank. Any suitable production tank (20) compatible with its intended use may be used. Various production tanks have been designed to provide for the separation of either two phases or three phases of a fluid. For instance, in the oil and gas industry, in order to separate CA 0220~2~8 1997-0~-13 the liquid phase of the fluid from the gas phase, two phase separators are typically used.
Further, in order to separate the gas phase and the oil and water comprising the liquid phase, three phase separators, such as free water knockouts and treaters, are used.
Thus, in the preferred embodiment, the production tank (20) may be a separator, a 5 treater or a free water knockout.
The production tank (20) is preferably sealed or sealable such that the tank (20) is gas tight. Thus, the gas phase is retained within the tank (20) and is not released therefrom except when desired by the operator of the tank (20). More specifically, the 10 tank (20) is substantially sealed so that substantially all of the gas phase contained within the tank (20) may exit the tank (20) only through one or more specific gas outlets provided for in the tank (20), as described further below.
Further, the tank (20) may or may not be pressurized, as required or 15 desired for any particular use of the tank (20). In the preferred embodiment, the tank (20) is comprised of a pressure vessel, being gas tight and capable of withstanding a required maximum pressure, from atmospheric pressure to any desired operating pressure. Thus, pressurized fluid may be contained within the tank (20). Preferably, the tank (20) is capable of operating at any pressure to a maximum of about 75 psi.
As stated, any shape or configuration of the tank (20) compatible with, and suitable for, its intended use and function, as described herein, may be used. However, the tank (20) is preferably cylindrical and has an outer wall (22), a first end (24), a second end (26) and a longitudinal axis extending between the first and second ends (24, 26). In 25 the preferred embodiment, the longitudinal axis of the tank (20) is oriented to be substantially horizontal. The tank (20) further includes a top (28) defined by the uppermost surface or area of the tank outer wall (22) and an opposing bottom (30) defined by the lowermost surface or area of the outer wall (22).
Further, the tank (20) includes at least one inlet for conducting the fluid into the tank (20) and two, three or more outlets for removing the various phases of the fluid from the tank (20). In the preferred embodiment, an inlet (32) communicates with the tank (20) such that the fluid may be directed into the tank (20) through the inlet (32). The inlet (32) is connectable to, or communicates directly or indirectly with, the supply of fluid. Preferably, the connection is sealed by a gasket or other suitable device in order to prevent the release of any fluid through the connection. The inlet CA 0220~2~8 1997-0~-13 (40) may communicate with the tank (20) at any location in the outer wall (22) of the tank (20) which is readily accessible and permits connection to the fluid supply.
As stated, the tank (20) is further comprised of two, three or more outlets 5 for removing the various phases of the fluid from the tank (20). Any number of each of these outlets may be present in the tank (20) depending upon the composition and volume of the fluid. These outlets include at least one outlet for removing the gas phase and at least one outlet for removing the liquid phase of the fluid. Each of these outlets communicate with the tank (20) through the outer wall (22) of the tank (20).
10 Further, each of these outlets may be located at any suitable location compatible with the function of the particular outlet which permits the removal of the particular fluid phase therethrough. The liquid phase passing out of the tank (20) through the liquid phase outlet or outlets may be directed to a suitable storage facility (not shown) or for further treatment and production.
Further, the tank (20) is comprised of a gas accumulation section for accumulating the gas phase as it naturally rises and tends to accumulate generally upwardly in the tank (20). The gas accumulation section (35) may be comprised of a portion, section, area or zone of the tank (20) or it may be comprised of any suitable 20 container, vessel, compartment or the like comprising the tank (20) such that the gas accumulation section (35) communicates with the remainder of the tank (20). The gas accumulation section (35) may be located in any suitable location or position which allows or permits the gas phase to accumulate generally upwardly therein. In thepreferred embodiment, where the tank (20) is substantially horizontal, the gas 25 accumulation section (35) is located at, adjacent or in close proximity to the top (28) of the tank (20).
The gas phase is accumulated in the gas accumulation section (35) for removal therefrom thorough a gas phase outlet. The gas phase outlet is preferably 30 comprised of the structure described below for directing the gas phase out of the gas accumulation section (35) and the tank (20). The gas phase removed from the gas accumulation section (35) may be directed to a suitable storage or treatment facility (not shown) or gas flare stack or pit (not shown) as desired.
The tank (20) is further comprised of a conduit (36) for directing the gas phase from the gas accumulation section (35) out of the tank (20) through the outer wall (22) of the tank (20). The gas phase is directed out of the tank (20) through the CA 0220~2~8 1997-0~-13 outer wall (22) at the level of the gas accumulation section (35) or at a level below the gas accumulation section (35) such that the gas phase is directed generally downwardly by the conduit (36). In the preferred embodiment, where the gas accumulation section (35) is located at, adjacent or in proximity to the top (28) of the tank (20), the gas phase 5 may be directed out of the tank (20) at the level of the gas accumulation section (35) so that the gas phase is released through the outer wall (22) at a position or location at, or adjacent to, the gas accumulation section (35). Alternately, the gas phase may be directed out of the tank (20) at a level below the gas accumulation section (35) so that the gas phase is released through the outer wall (22) at a position or location in the 10outer wall (22) nearer or closer to the bottom (30) of the tank (20) than the gas accumulation section (35). In either event, the conduit (36) is aligned or oriented in a manner or in a direction such that the gas phase is directed generally downwardly through the conduit (36).
15More particularly, the conduit (36) is comprised of a first end (38) and a second end (40). The first end (38) is within the gas accumulation section (35) for communication with the gas phase. Thus, the gas phase is permitted to pass from the gas accumulation section (35) into the conduit (36) through the first end (38). The second end (40) extends through the outer wall (22) of the tank (20) at the level of the 20 gas accumulation section (35) or at a level below the gas accumulation section (35).
More particularly, the gas phase is directed by the conduit (36) from the gas accumulation section (35), through the first end (38), generally downwardly for release through the second end (40) of the conduit (36). As stated above, the tank (20) is preferably sealed so that substantially all of the gas phase is released through the second 25 end (40) of the conduit (36).
Thus, the gas phase naturally tends to accumulate generally upwardly in the gas accumulation section (35), where it is directed generally downwardly through the conduit (36) for release from the tank (20). In conventional gas accumulation 30 sections (35), the gas phase is released from the gas accumulation section (35) and the tank (20) in an upward direction above the level of the gas accumulation section (35), which tends to add to the overall height of the tank (20). By redirecting the gas phase from the gas accumulation section (35) to a level at or below the gas accumulation section (35), the height of the tank (20) may be reduced from that of conventional tanks 35 (20).
CA 0220~2~8 1997-0~-13 The conduit (36) may be comprised of any conduit, channel, tunnel, pipe or the like suitable for, and capable of, directing or conducting the gas phase of the fluid therethrough. Further, the conduit (36) may be comprised of any suitable material compatible with the nature of the gas phase directed therein. As well, the conduit (36) 5 may be of any suitable shape, size or configuration. Finally, the conduit (36) may be comprised of one or more portions, each portion being individually oriented or aligned in any manner or direction so long as the gas phase is directed generally downwardly from the first end (38) to the second end (40).
The conduit (36) is preferably comprised of at least two portions connected or joined together in any suitable manner permitting the gas phase to pass through the conduit (36), or to be conducted therein, from the first end (38) to the second end (40).
Alternately, the conduit (36) may be a single piece or length, which is bent to form the various portions thereof. In the preferred embodiment, the conduit (36) is comprised of a first portion (44) and a second portion (46). Further, the second end (40) preferably extends through the outer wall (22) at a level below the gas accumulation section (35).
The first portion (44) extends generally downwardly from the first end (38) for connection to the second portion (46). The second portion (46) extends from the first portion (44) to the second end (40). the portions (44, 46) may be connected together by any suitable device, structure, apparatus, mechanism or the like permitting the gas phase to pass from the first portion (44) to the second portion (46). In the preferred embodiment, the portions (44, 46) are connected by an elbow portion (48) which permits the first and second portions (44, 46) to be aligned in different planes or to extend in different directions. Preferably, the first portion (44) is located in a substantially vertical plane and extends from within the gas accumulation section (35) to a position outside the gas accumulation section (35), below the gas accumulation section (35). In other words, the first portion (44) extends from the first end (38) to a position or location nearer or closer to the bottom (30) of the tank (20) than the gas accumulation section (35). Preferably, the second portion (46) is located in a substantially horizontal plane and extends from the first portion (44) to the second end (40) outside of the outer wall (22) of the tank (20). Thus, the elbow portion (48) connecting the first and second portions (44, 46) forms substantially a 90 degree angle.
A valve (50) is preferably associated with the second end (40) of the conduit (36) for controlling the release of the gas phase through the second end (40).
The valve (50) is preferably located within the outer wall (22) or outside of the outer CA 0220~2~8 1997-0~-13 wall (22) so that it may be accessed from outside the tank (20). Preferably, the valve (50) is comprised of a back pressure valve (50). The back pressure valve (50) may be any conventional valve or device for maintaining a desired pressure in the tank (20) such as a weight loaded, spring loaded or pilot operated gas back pressure valve. The5 pressure setting of the back pressure valve (50) is preferably variable so that it may be set by the operator of the tank (20) depending upon the desired flow rate of the fluid into the tank (20) and the desired flow rate of the gas phase out of the second end (40) of the conduit (36). A further transportation conduit (52) or pipe may then be connected to the valve (50) on the opposite side from the conduit (36) so that the gas phase may be 10 directed or transported to a suitable storage or treatment facility (not shown) or gas flare stack or pit (not shown) as desired.
The gas accumulation section (35) of the tank (20) is preferably comprised of a gas dome (52), which communicates with the tank (20), such that the gas phase accumulates in the gas dome (52) for removal from the tank (20). The gas dome (52) may be of any type, size or configuration suitable for use with the particular gas phase in the tank (20) and may be comprised of any vessel, container, structure or the like suitable for accumulating the gas phase therein. The gas dome (52) is preferablymounted at, adjacent or in close proximity to the top (28) of the tank (20) given the 20 natural tendency of the gas phase to rise and accumulate generally upwardly. In the preferred embodiment, the gas dome (52) is located on the top (28) of the tank (20) or at its uppermost surface.
Further, the gas dome (52) is preferably comprised of an upper section (54) 25 and a lower section (56). The gas phase tends to rise within the gas dome (52) and naturally accumulate towards the upper section (54). As a result, the conduit (36) preferably extends through the lower section (56) and the first end (38) of the conduit (36) preferably communicates with the upper section (54). Thus, the gas phase isdirected by the conduit (36) out of the upper section (54) of the gas dome (52). More 30 particularly, in the preferred embodiment, the first portion (44) of the conduit (36) extends from the first end (38), within the upper section (54) of the gas dome (52), through the lower section (56) of the gas dome (52) and out of the gas dome (52)completely for connection to the elbow portion (48) of the conduit (36).
Finally, the gas dome (52) may be further comprised of a filter (58) located or positioned between the upper section (54) and the lower section (56) of the gas dome (52) for filtering the gas phase as the gas phase passes therethrough and accumulates in g CA 0220~2~8 1997-0~-13 the upper section (54) from the lower section (56). The filter (58) may be of any type suitable for, and compatible with, filtering the particular gas phase passing therethrough in order to remove any components or elements of the gas phase desired to be removed by the operator of the tank (20). Further, the filter (58) preferably 5 provides a substantially complete barrier between the upper and lower sections (54, 56) such that substantially all of the gas phase entering the first end (38) of the conduit (36) has been filtered.
Claims (9)
1. In a tank for containing a fluid having a gas phase, the tank comprising an outer wall and a gas accumulation section wherein the gas phase accumulates generally upwardly in the gas accumulation section for removal from the tank, the improvement which comprises:
(a) a conduit having a first end within the gas accumulation section for communicating with the gas phase and a second end extending through the outer wall of the tank at the level of the gas accumulation section or at a level below the gas accumulation section for directing the gas phase out of the tank; and (b) a valve associated with the second end of the conduit for controlling the release of the gas phase through the second end.
(a) a conduit having a first end within the gas accumulation section for communicating with the gas phase and a second end extending through the outer wall of the tank at the level of the gas accumulation section or at a level below the gas accumulation section for directing the gas phase out of the tank; and (b) a valve associated with the second end of the conduit for controlling the release of the gas phase through the second end.
2. The tank as claimed in claim 1 wherein the gas phase is directed by the conduit from the gas accumulation section generally downwardly for release through the second end of the conduit.
3. The tank as claimed in claim 2 wherein the conduit is comprised of atleast two portions connected together such that the gas phase is permitted to pass through the conduit from the first end to the second end.
4. The tank as claimed in claim 3 wherein the conduit is comprised of a first portion and a second portion, wherein the first portion extends generally downwardly from the first end for connection to the second portion and wherein the second portion extends from the first portion to the second end.
5. The tank as claimed in claim 1, 2, 3 or 4 wherein the tank is substantially sealed such that substantially all of the gas phase is released through the second end of the conduit.
6. The tank as claimed in claim 5 wherein the tank is comprised of a pressure vessel.
7. The tank as claimed in claim 5 wherein the gas accumulation section is comprised of a gas dome.
8. The tank as claimed in claim 7 wherein the gas dome is comprised of an upper section and a lower section, wherein the conduit extends through the lowersection and the first end of the conduit communicates with the upper section such that the gas phase is directed by the conduit out of the upper section of the gas dome.
9. The tank as claimed in claim 8 wherein the gas dome is further comprised of a filter between the upper section and the lower section for filtering the gas phase as the gas phase accumulates in the upper section from the lower section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2205258 CA2205258A1 (en) | 1997-05-13 | 1997-05-13 | Gas dome for a tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2205258 CA2205258A1 (en) | 1997-05-13 | 1997-05-13 | Gas dome for a tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2205258A1 true CA2205258A1 (en) | 1998-11-13 |
Family
ID=4160641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2205258 Abandoned CA2205258A1 (en) | 1997-05-13 | 1997-05-13 | Gas dome for a tank |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2205258A1 (en) |
-
1997
- 1997-05-13 CA CA 2205258 patent/CA2205258A1/en not_active Abandoned
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| Date | Code | Title | Description |
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| FZDE | Dead |