CA2287593C - Hydraulic blowout preventer assembly for production wellhead - Google Patents
Hydraulic blowout preventer assembly for production wellhead Download PDFInfo
- Publication number
- CA2287593C CA2287593C CA 2287593 CA2287593A CA2287593C CA 2287593 C CA2287593 C CA 2287593C CA 2287593 CA2287593 CA 2287593 CA 2287593 A CA2287593 A CA 2287593A CA 2287593 C CA2287593 C CA 2287593C
- Authority
- CA
- Canada
- Prior art keywords
- ram
- housing
- external
- side wall
- tree
- 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.)
- Expired - Lifetime
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 31
- 239000012530 fluid Substances 0.000 claims abstract description 32
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 238000007789 sealing Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 229920001971 elastomer Polymers 0.000 description 2
- 102100035353 Cyclin-dependent kinase 2-associated protein 1 Human genes 0.000 description 1
- 101150087654 chrnd gene Proteins 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 235000015250 liver sausages Nutrition 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B33/06—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers
- E21B33/061—Ram-type blow-out preventers, e.g. with pivoting rams
- E21B33/062—Ram-type blow-out preventers, e.g. with pivoting rams with sliding rams
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Pipe Accessories (AREA)
- Actuator (AREA)
Abstract
In the hydraulic blowout preventer of an integral production wellhead, the ram chambers and hydraulic fluid supply line are both buried or formed in the side wall of the blowout preventer.
Description
2 FIELD OF THE INVENTION
3 The present invention relates to a hydraulic production blowout
4 preventer ("BOP"), its utilization as part of an integral production wellhead tree and the provision of BOP ram hydraulic chambers and a hydraulic fluid supply 6 passageway which are positioned within the body of the tree.
9 A typical, commerciali'y available, prior art hydraulic BOP, incorporated into a conventional production wellhead tree, is illustrated in Figure 1. It will 11 be noted that the assembly involves:
12 ~ a BOP housing which forms opposed horizontal ram chambers and 13 has threaded side connections., the BOP housing further having 14 threaded top acrd bottom connections for connecting with other components of the production wellhead;
16 ~ the BOP housin~a also forms a vertical central fluid production bore 17 extending therethrough and the ram chambers extend between the 18 external surface of the housing and the bore;
19 ~ the ram chambers each contain a sealed ram comprising an inner elastomeric elen7ent and an outer, steel body;
21 ~ a pair of external housings are connected to the side connections;
22 and (E3035568. D0(;;1 }~
1 ~ each external housing forms an internal space or chamber which 2 contains a sealed piston which supports a return spring - the piston 3 is connected with the ram and a port is formed in the external 4 housing outer end wall, for connection with a hydraulic line;
~ whereby hydraulic fluid, supplied under pressure to the external 6 housing through the hydraulic line, advances the piston to drive the 7 ram into the wellhead bore to assume a closed position for sealing 8 around a rod string (not shown) and the return spring retracts the 9 ram and piston i:o an open position when the hydraulic pressure is released.
11 It will be noted that the external housings form the hydraulic chambers 12 for the BOP and must be fluid tight and of sturdy enough structure to contain 13 the hydraulic pressure.
14 In a recent development, an integral production wellhead tree was disclosed in Canadian PatE~nt Na. 2,197,584, (the "'584 patent"), issued to the 16 present applicant. This tree, shown in Figure 2, involves integrating BOP
and 17 flow tee housings between top and bottom tubing head connections, as a 18 unitary steel body. More ~~articularly the tree comprises a forged or cast one-19 piece body forming a vertical fluid production bore and incorporates:
~ a bottom connection adapted to connect and seal with a tubing 21 head;
{E3035568.DOC;1 }3 1 ~ a BOP housing, whose side wall forms opposed side openings or 2 chambers for containing BOP rams, which chambers communicate 3 or connect with the fluid production bore - it will be noted that the 4 chambers can be described as being 'buried' in the side wall;
~ a flow tee housing forming a side opening communicating with the 6 bore and having means for connecting with a flow line; and 7 ~ a top connection for sealing and connecting with the next 8 component of the production wellhead, usually a stuffing box.
9 The tree of the '584 patent further has a generally cylindrical configuration, which results in a relatively thick side wall when compared with 11 prior production wellheads..
14 The present invention is concerned with providing a production assembly comprising:
16 ~ an integral production wellhead tree having a BOP housing;
17 ~ the :>ide wall of the BOP housing forming a pair of horizontal 18 opposed chamber:>, each extending between the housing's external 19 surface and the tree's vertical bore;
~ the side wall of the tree forming a first passageway means, 21 extending between the tree's external surface and the outer end of 22 each chamber, through which hydraulic fluid may be supplied under 23 pressure;
(E3035568.DOC;1 }4 1 in use, a BOP earn and piston assembly is positioned within each 2 chamber;
3 whereby hydraulic fluid may be supplied through the first 4 passageway means to the chambers to bias the ram and piston assemblies to the closed position;
6 a pair of external housings is disengagably secured to ths~ BOP
7 housing side wall for closing and sealing the outer ends of the 8 chambers;
9 each external housing preferably forms a sealed internal space or chamber;]
11 preferably a shaft element is connected with each ram and piston 12 assembly and extends into the internal space of the associated 13 external housing: and 14 return means, ;9uch as a spring, are provided in each external housing internal space, for acting on the shaft element to bias the 16 ram and piston assembly to the open position.
17 It is to be noted:
18 that the BOP components are provided in the form of ram and 19 piston assemblies which are wholly located within the housing chambers;
21 that the chambers and the hydraulic fluid passageway (which both 22 must contain pressured are buried within the housing side wall; and 23 that the external housings do nat necessarily have to be 24 constructed so as 1:o contain pressure.
iE3035568.DOC;1 }5 1 In addition, the assembly lends itself to a preferred combination with 2 additional mechanical means for closing and locking the rams in the closed 3 position as a safety "override". More particularly, means, such as a threaded 4 bolt, may be mounted to the external housing and extend into the housing's chamber, for biasing the shaft element and ram to the closed position and 6 locking them there.
7 In a variant of the foregoing, the passageway means may be extended 8 from the BOP housing through the external housing wall, to communicate with 9 the external housing chamber at its outer end. When the shaft element is sealed to the external housing side wall, it now is converted to a piston. The 11 hydraulic fluid pressure can then be applied not only to the outer face of the 12 ram ,and piston assembly lout also to the shaft element piston outer face, 13 thereby increasing the clo:>ing force. In this case, the external housing would, 14 of course, have to be capable of containing the fluid pressure. However the assembly still lends itself to use with the mechanical override means.
16 In another variant, a second passageway means is formed through the 17 BOP housing side wall anca external housing side wall to supply hydraulic fluid 18 into the external housing chamber to act against the inner face of the piston, 19 thereby permitting the assembly to be opened with hydraulic fluid.
Broadly stated, the invention is directed to an improvement in a 21 production wellhead assembly, comprising: an integral production wellhead 22 tree having a side wall, an external surface and a fluid production bore 23 extending therethrough; the tree comprising a hydraulic blow-out preventer 24 ("BOP") housing having ~a side wall and external surface; the BOP housing {E3035568.DOC;1 }6 1 side wall forming a pair of r>pposed chambers, having inner and outer ends, 2 extending between the housing external surface and the bore, each chamber 3 being operative to receive a sealed ram and piston assembly slideable 4 between open and closed positions; the tree side wall forming hydraulic fluid supply first passageway means extending between the tree external surface 6 and the outer end of each chamber, so that hydraulic fluid may be supplied 7 therethrough to advance the ram and piston assemblies into the bore to the 8 closed position; and means, disengagably secured to the BOP housing side 9 wall, for closing and sealing the outer ends of the chambers.
12 Figure 1 is a side view, partly in section, showing a typical prior art 13 production wellhead tree irncorporating a hydraulic production BOP;
14 Figure 2 is a persfrective view, partly in section, showing a prior art integral production wellhead tree incorporating a bottom connection, 16 mechanical BOP, flow tee and top connection;
17 Figure 3 is a top plan view, in section, showing a hydraulic BOP in 18 accordance with the invention, which structure incorporates a hydraulic fluid 19 passageway buried in that BOP housing side wall and a mechanical BOP
override means. The figure 'further shows a pair of sealed rams in the opened 21 and closed positions, and a pair of external housings, each containing a return 22 spring;
{E3035568. DOC;1 }7 1 Figure 4 is a view similar to Figure 3 but further showing a hydraulic 2 fluid passageway extendir7g through the external housing side wall into the 3 outer end of the external housing chamber; and 4 Figure 5 is a view similar to Figure 4 but further showing a second hydraulic fluid passageway buried in the BOP housing side wall and extending 6 into or communicating with the inner end of the external housing chamber.
9 In the embodiment shown in Figure 3, we provide a hydraulic production BOP 1 which is incorporated into an integral production wellhead 11 tree 2.
12 The tree 2 comprises, in sequence from the bottom to the top, a bottom 13 connection 3, a BOP housing 4, a flow tee housing 5 and a top connection 6.
14 The bottom connection 3 is sized and adapted to connect and seal with the top connection of a tubing head (not shown). The top connection 6 is sized 16 and adapted to connect arnd seal with the bottom connection of a stuffing box 17 (not shown). The tree 2 has a vertical, axial, substantially cylindrical fluid 18 production bore 7 extendirng therethrough. The external surface 8 of the tree 19 2 is substantially cylindrical.
{E3035568.DOC;;1 }8 1 The tree's BOP housing side wall 10 forms a pair of opposed, 2 horizontal, cylindrical chambers 11 extending between the external surface 8 3 and the bore 7. These buried chambers 11 function to receive a pair of BOP
4 ram and piston assemblies 12. Each assembly 12 comprises an outer steel body or piston 13 connected with an inner elastomer section or ram 14, 6 commonly referred to as the "rubber". The ram and piston assemblies '12 are 7 slidable within the chambers 11 between open and closed positions illustrated 8 in Figure 3.
9 A hydraulic fluid supply first passageway means 15 is formed by the BOP housing side wall 10. It extends from the external surface 8 to the outer 11 ends of the ram chambers 11 and is buried in the side wall 10. The ram and 12 piston assemblies 12 are sealed in conventional fashion with O-ring seals 16.
13 An external housing 18 is disengagably secured (as by threads) to the 14 BOP housing side wall 10 at the outer end of each ram chamber 11. Each external housing 18 has an inner end wall 19 which extends across the end 16 opening 20 of its associated ram chamber 11. An 0-ring seal 28 forms part of 17 the external housing 18 and seals the end wall 19 with the BOP housing side 18 wall 10. Thus the external housing 18 provides means for closing and sealing 19 the outer end of its associated ram chamber 11.
Thus pressurized rnydraulic fluid can be supplied through the first 21 passageway means 15 to act against the outer end faces 17 of the ram and 22 piston assemblies 12, to thereby advance the rams to the closed position in 23 which they extend into the bore 7 to close about a rod string (not shown).
24 Each external housing 18 forms an enclosed space or chamber 21.
{E303556$. DC)G;1 }9 1 A shaft element 22 is connected to each ram and piston assembly 12.
2 The shaft element 22 extends through an opening 23, formed in the adjacent 3 external housing inner end wall 19, into the chamber 21 of its associated 4 external housing 18. An ()-ring seal 24 seals between the shaft element 22 and the end wall 19. At its outer end, the shaft element 22 has an expanded 6 diameter body 25. A return spring 26 is contained within the chamber 21 and 7 is supported by the shaft element body 25. The spring 26 provides means for 8 normally urging the shaft a=lement 22 and ram and piston assembly 12 to the 9 open position.
A threaded bolt 27 Extends through a threaded opening 28 in the outer 11 end wall 29 of each external housing 18. The bolts 27 can be turned to bias 12 the ram and piston assemblies 12 into the closed position and lock them 13 there: The bolts 27 therefore each provide mechanical means for advancing 14 an associated shaft element and ram and piston assembly to the closed position and locking it in that position.
16 In operation therefore, pressurized hydraulic fluid can be fed through 17 the first passageway 15 to bias the ram and piston assemblies 12 'to the 18 closed position. During this action, the shaft element 22 compresses the 19 return spring 2C-i. The bolts 27 may be advanced to lock the assemblies 12 in place. If the rams 12 are. snot locked in this manner, upon opening of the 21 passageway 15 and release of the hydraulic pressure, the return spring 26 will 22 return the assemblies 12 tc> the open position.
{E3035568. DOC 1 } 1 0 1 In an alternative variant, shown in Figure 4, the first passageway 15 2 further extends through the external housing side wall 30 and communicates 3 with the outer ends 31 of the external housing chambers 21. As a result, 4 pressurized hydraulic fluid may be applied to both the ram and piston assembly outer end faces 1 i' and the shaft element outer end faces 32 for the 6 purpose of biasing the assemblies 12 to the closed position. Otherwise 7 stated, this variant involves dual chamber actuation to close, with spring 8 return to open.
9 In another variant, shown in Figure 5, a second passageway means 40 is formed through the BOF' mousing side wall 10. The passageway means 40 11 extends from the external surface 8 to the inner ends of the external housing 12 chambers 21. Thus pressurized hydraulic fluid may be delivered through the 13 buried passageway means 40 to act against the inner end faces 41 of the 14 shaft element expanded diameter bodies 25, to hydraulically open or retract the rams 12.
16 From the foregoing, it will be noted that the invention is characterized 17 by the following advantages:
18 ~ the hydraulic lines at the wellhead are buried inside the BOP body;
19 ~ the likelihood of damage is minimized and;
~ the external housing no longer has to contain pressure and its size 21 and cost are reduced.
{E303556$. UOC,1 ) 1 1
9 A typical, commerciali'y available, prior art hydraulic BOP, incorporated into a conventional production wellhead tree, is illustrated in Figure 1. It will 11 be noted that the assembly involves:
12 ~ a BOP housing which forms opposed horizontal ram chambers and 13 has threaded side connections., the BOP housing further having 14 threaded top acrd bottom connections for connecting with other components of the production wellhead;
16 ~ the BOP housin~a also forms a vertical central fluid production bore 17 extending therethrough and the ram chambers extend between the 18 external surface of the housing and the bore;
19 ~ the ram chambers each contain a sealed ram comprising an inner elastomeric elen7ent and an outer, steel body;
21 ~ a pair of external housings are connected to the side connections;
22 and (E3035568. D0(;;1 }~
1 ~ each external housing forms an internal space or chamber which 2 contains a sealed piston which supports a return spring - the piston 3 is connected with the ram and a port is formed in the external 4 housing outer end wall, for connection with a hydraulic line;
~ whereby hydraulic fluid, supplied under pressure to the external 6 housing through the hydraulic line, advances the piston to drive the 7 ram into the wellhead bore to assume a closed position for sealing 8 around a rod string (not shown) and the return spring retracts the 9 ram and piston i:o an open position when the hydraulic pressure is released.
11 It will be noted that the external housings form the hydraulic chambers 12 for the BOP and must be fluid tight and of sturdy enough structure to contain 13 the hydraulic pressure.
14 In a recent development, an integral production wellhead tree was disclosed in Canadian PatE~nt Na. 2,197,584, (the "'584 patent"), issued to the 16 present applicant. This tree, shown in Figure 2, involves integrating BOP
and 17 flow tee housings between top and bottom tubing head connections, as a 18 unitary steel body. More ~~articularly the tree comprises a forged or cast one-19 piece body forming a vertical fluid production bore and incorporates:
~ a bottom connection adapted to connect and seal with a tubing 21 head;
{E3035568.DOC;1 }3 1 ~ a BOP housing, whose side wall forms opposed side openings or 2 chambers for containing BOP rams, which chambers communicate 3 or connect with the fluid production bore - it will be noted that the 4 chambers can be described as being 'buried' in the side wall;
~ a flow tee housing forming a side opening communicating with the 6 bore and having means for connecting with a flow line; and 7 ~ a top connection for sealing and connecting with the next 8 component of the production wellhead, usually a stuffing box.
9 The tree of the '584 patent further has a generally cylindrical configuration, which results in a relatively thick side wall when compared with 11 prior production wellheads..
14 The present invention is concerned with providing a production assembly comprising:
16 ~ an integral production wellhead tree having a BOP housing;
17 ~ the :>ide wall of the BOP housing forming a pair of horizontal 18 opposed chamber:>, each extending between the housing's external 19 surface and the tree's vertical bore;
~ the side wall of the tree forming a first passageway means, 21 extending between the tree's external surface and the outer end of 22 each chamber, through which hydraulic fluid may be supplied under 23 pressure;
(E3035568.DOC;1 }4 1 in use, a BOP earn and piston assembly is positioned within each 2 chamber;
3 whereby hydraulic fluid may be supplied through the first 4 passageway means to the chambers to bias the ram and piston assemblies to the closed position;
6 a pair of external housings is disengagably secured to ths~ BOP
7 housing side wall for closing and sealing the outer ends of the 8 chambers;
9 each external housing preferably forms a sealed internal space or chamber;]
11 preferably a shaft element is connected with each ram and piston 12 assembly and extends into the internal space of the associated 13 external housing: and 14 return means, ;9uch as a spring, are provided in each external housing internal space, for acting on the shaft element to bias the 16 ram and piston assembly to the open position.
17 It is to be noted:
18 that the BOP components are provided in the form of ram and 19 piston assemblies which are wholly located within the housing chambers;
21 that the chambers and the hydraulic fluid passageway (which both 22 must contain pressured are buried within the housing side wall; and 23 that the external housings do nat necessarily have to be 24 constructed so as 1:o contain pressure.
iE3035568.DOC;1 }5 1 In addition, the assembly lends itself to a preferred combination with 2 additional mechanical means for closing and locking the rams in the closed 3 position as a safety "override". More particularly, means, such as a threaded 4 bolt, may be mounted to the external housing and extend into the housing's chamber, for biasing the shaft element and ram to the closed position and 6 locking them there.
7 In a variant of the foregoing, the passageway means may be extended 8 from the BOP housing through the external housing wall, to communicate with 9 the external housing chamber at its outer end. When the shaft element is sealed to the external housing side wall, it now is converted to a piston. The 11 hydraulic fluid pressure can then be applied not only to the outer face of the 12 ram ,and piston assembly lout also to the shaft element piston outer face, 13 thereby increasing the clo:>ing force. In this case, the external housing would, 14 of course, have to be capable of containing the fluid pressure. However the assembly still lends itself to use with the mechanical override means.
16 In another variant, a second passageway means is formed through the 17 BOP housing side wall anca external housing side wall to supply hydraulic fluid 18 into the external housing chamber to act against the inner face of the piston, 19 thereby permitting the assembly to be opened with hydraulic fluid.
Broadly stated, the invention is directed to an improvement in a 21 production wellhead assembly, comprising: an integral production wellhead 22 tree having a side wall, an external surface and a fluid production bore 23 extending therethrough; the tree comprising a hydraulic blow-out preventer 24 ("BOP") housing having ~a side wall and external surface; the BOP housing {E3035568.DOC;1 }6 1 side wall forming a pair of r>pposed chambers, having inner and outer ends, 2 extending between the housing external surface and the bore, each chamber 3 being operative to receive a sealed ram and piston assembly slideable 4 between open and closed positions; the tree side wall forming hydraulic fluid supply first passageway means extending between the tree external surface 6 and the outer end of each chamber, so that hydraulic fluid may be supplied 7 therethrough to advance the ram and piston assemblies into the bore to the 8 closed position; and means, disengagably secured to the BOP housing side 9 wall, for closing and sealing the outer ends of the chambers.
12 Figure 1 is a side view, partly in section, showing a typical prior art 13 production wellhead tree irncorporating a hydraulic production BOP;
14 Figure 2 is a persfrective view, partly in section, showing a prior art integral production wellhead tree incorporating a bottom connection, 16 mechanical BOP, flow tee and top connection;
17 Figure 3 is a top plan view, in section, showing a hydraulic BOP in 18 accordance with the invention, which structure incorporates a hydraulic fluid 19 passageway buried in that BOP housing side wall and a mechanical BOP
override means. The figure 'further shows a pair of sealed rams in the opened 21 and closed positions, and a pair of external housings, each containing a return 22 spring;
{E3035568. DOC;1 }7 1 Figure 4 is a view similar to Figure 3 but further showing a hydraulic 2 fluid passageway extendir7g through the external housing side wall into the 3 outer end of the external housing chamber; and 4 Figure 5 is a view similar to Figure 4 but further showing a second hydraulic fluid passageway buried in the BOP housing side wall and extending 6 into or communicating with the inner end of the external housing chamber.
9 In the embodiment shown in Figure 3, we provide a hydraulic production BOP 1 which is incorporated into an integral production wellhead 11 tree 2.
12 The tree 2 comprises, in sequence from the bottom to the top, a bottom 13 connection 3, a BOP housing 4, a flow tee housing 5 and a top connection 6.
14 The bottom connection 3 is sized and adapted to connect and seal with the top connection of a tubing head (not shown). The top connection 6 is sized 16 and adapted to connect arnd seal with the bottom connection of a stuffing box 17 (not shown). The tree 2 has a vertical, axial, substantially cylindrical fluid 18 production bore 7 extendirng therethrough. The external surface 8 of the tree 19 2 is substantially cylindrical.
{E3035568.DOC;;1 }8 1 The tree's BOP housing side wall 10 forms a pair of opposed, 2 horizontal, cylindrical chambers 11 extending between the external surface 8 3 and the bore 7. These buried chambers 11 function to receive a pair of BOP
4 ram and piston assemblies 12. Each assembly 12 comprises an outer steel body or piston 13 connected with an inner elastomer section or ram 14, 6 commonly referred to as the "rubber". The ram and piston assemblies '12 are 7 slidable within the chambers 11 between open and closed positions illustrated 8 in Figure 3.
9 A hydraulic fluid supply first passageway means 15 is formed by the BOP housing side wall 10. It extends from the external surface 8 to the outer 11 ends of the ram chambers 11 and is buried in the side wall 10. The ram and 12 piston assemblies 12 are sealed in conventional fashion with O-ring seals 16.
13 An external housing 18 is disengagably secured (as by threads) to the 14 BOP housing side wall 10 at the outer end of each ram chamber 11. Each external housing 18 has an inner end wall 19 which extends across the end 16 opening 20 of its associated ram chamber 11. An 0-ring seal 28 forms part of 17 the external housing 18 and seals the end wall 19 with the BOP housing side 18 wall 10. Thus the external housing 18 provides means for closing and sealing 19 the outer end of its associated ram chamber 11.
Thus pressurized rnydraulic fluid can be supplied through the first 21 passageway means 15 to act against the outer end faces 17 of the ram and 22 piston assemblies 12, to thereby advance the rams to the closed position in 23 which they extend into the bore 7 to close about a rod string (not shown).
24 Each external housing 18 forms an enclosed space or chamber 21.
{E303556$. DC)G;1 }9 1 A shaft element 22 is connected to each ram and piston assembly 12.
2 The shaft element 22 extends through an opening 23, formed in the adjacent 3 external housing inner end wall 19, into the chamber 21 of its associated 4 external housing 18. An ()-ring seal 24 seals between the shaft element 22 and the end wall 19. At its outer end, the shaft element 22 has an expanded 6 diameter body 25. A return spring 26 is contained within the chamber 21 and 7 is supported by the shaft element body 25. The spring 26 provides means for 8 normally urging the shaft a=lement 22 and ram and piston assembly 12 to the 9 open position.
A threaded bolt 27 Extends through a threaded opening 28 in the outer 11 end wall 29 of each external housing 18. The bolts 27 can be turned to bias 12 the ram and piston assemblies 12 into the closed position and lock them 13 there: The bolts 27 therefore each provide mechanical means for advancing 14 an associated shaft element and ram and piston assembly to the closed position and locking it in that position.
16 In operation therefore, pressurized hydraulic fluid can be fed through 17 the first passageway 15 to bias the ram and piston assemblies 12 'to the 18 closed position. During this action, the shaft element 22 compresses the 19 return spring 2C-i. The bolts 27 may be advanced to lock the assemblies 12 in place. If the rams 12 are. snot locked in this manner, upon opening of the 21 passageway 15 and release of the hydraulic pressure, the return spring 26 will 22 return the assemblies 12 tc> the open position.
{E3035568. DOC 1 } 1 0 1 In an alternative variant, shown in Figure 4, the first passageway 15 2 further extends through the external housing side wall 30 and communicates 3 with the outer ends 31 of the external housing chambers 21. As a result, 4 pressurized hydraulic fluid may be applied to both the ram and piston assembly outer end faces 1 i' and the shaft element outer end faces 32 for the 6 purpose of biasing the assemblies 12 to the closed position. Otherwise 7 stated, this variant involves dual chamber actuation to close, with spring 8 return to open.
9 In another variant, shown in Figure 5, a second passageway means 40 is formed through the BOF' mousing side wall 10. The passageway means 40 11 extends from the external surface 8 to the inner ends of the external housing 12 chambers 21. Thus pressurized hydraulic fluid may be delivered through the 13 buried passageway means 40 to act against the inner end faces 41 of the 14 shaft element expanded diameter bodies 25, to hydraulically open or retract the rams 12.
16 From the foregoing, it will be noted that the invention is characterized 17 by the following advantages:
18 ~ the hydraulic lines at the wellhead are buried inside the BOP body;
19 ~ the likelihood of damage is minimized and;
~ the external housing no longer has to contain pressure and its size 21 and cost are reduced.
{E303556$. UOC,1 ) 1 1
Claims (6)
EXCLUSIVE PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS
FOLLOWS:
1. A production wellhead assembly, comprising:
an integral production wellhead tree having a side wall, an external surface and a fluid production bore extending therethrough;
the tree comprising a hydraulic blow-out preventer ("BOP") housing having a side wall and external surface;
the BOP housing side wall forming a pair of opposed chambers, having inner and outer ends. extending between the housing external surface and the bore, each chamber being operative to receive a sealed ram and piston assembly slideable between open and closed positions;
the tree side wall forming hydraulic fluid supply first passageway means extending between the tree external surface and the outer end of each chamber, so that hydraulic fluid may be supplied therethrough to advance the ram and piston assemblies into the bore to the closed position; and means, disengagably secured to the BOP housing side wall, for closing and sealing the outer ends of the chambers.
an integral production wellhead tree having a side wall, an external surface and a fluid production bore extending therethrough;
the tree comprising a hydraulic blow-out preventer ("BOP") housing having a side wall and external surface;
the BOP housing side wall forming a pair of opposed chambers, having inner and outer ends. extending between the housing external surface and the bore, each chamber being operative to receive a sealed ram and piston assembly slideable between open and closed positions;
the tree side wall forming hydraulic fluid supply first passageway means extending between the tree external surface and the outer end of each chamber, so that hydraulic fluid may be supplied therethrough to advance the ram and piston assemblies into the bore to the closed position; and means, disengagably secured to the BOP housing side wall, for closing and sealing the outer ends of the chambers.
2. The production well assembly as set forth in claim 1 comprising:
a ram and piston assembly positioned in each chamber.
a ram and piston assembly positioned in each chamber.
3. The production wellhead assembly as set forth in claim 1 or 2 wherein the means for closing and sealing the outer ends of the chambers comprises a pair of disengageable external housings, each closing and sealing the outer end of one of the chambers, with which it is associated;
said external housings each forming a sealed internal space;
said wellhead assembly further comprising:
a pair of shaft elements, each connected with a ram and piston assembly and extending into the internal space of its associated external housing; and means, contained within each external housing internal space, for normally urging the shaft element and ram and piston assembly to the open position.
said external housings each forming a sealed internal space;
said wellhead assembly further comprising:
a pair of shaft elements, each connected with a ram and piston assembly and extending into the internal space of its associated external housing; and means, contained within each external housing internal space, for normally urging the shaft element and ram and piston assembly to the open position.
4. The production wellhead assembly as set forth in claim 1, 2 or 3 comprising:
a pair of mechanical means, each connected with one of the external housings, operative to bias the shaft element and ram and piston assembly to the closed position and lock them in that position.
a pair of mechanical means, each connected with one of the external housings, operative to bias the shaft element and ram and piston assembly to the closed position and lock them in that position.
5. The production wellhead assembly as set forth in claim 3 or 4 wherein:
each shaft element is sealed to its associated external housing; and the first passageway means is further connected with the outer end of each external housing internal space;
whereby hydraulic fluid may act simultaneously against each of the ram and piston assemblies and the shaft elements to close the ram and piston assemblies.
each shaft element is sealed to its associated external housing; and the first passageway means is further connected with the outer end of each external housing internal space;
whereby hydraulic fluid may act simultaneously against each of the ram and piston assemblies and the shaft elements to close the ram and piston assemblies.
6. The production wellhead assembly as set forth in claim 1 comprising:
a pair of disengageable external housings, each closing and sealing the outer end of one of the chambers, said external housings each forming a sealed internal space and having inner and outer ends;
a shaft element connected with the outer end of each ram and piston assembly and extending into the internal space of its associated external housing; and said tree side wall forming hydraulic fluid supply second passageway means, extending between the tree external surface and the inner end of each housing internal space, so that hydraulic fluid may be supplied therethrough to retract the ram and piston assemblies to the open position.
a pair of disengageable external housings, each closing and sealing the outer end of one of the chambers, said external housings each forming a sealed internal space and having inner and outer ends;
a shaft element connected with the outer end of each ram and piston assembly and extending into the internal space of its associated external housing; and said tree side wall forming hydraulic fluid supply second passageway means, extending between the tree external surface and the inner end of each housing internal space, so that hydraulic fluid may be supplied therethrough to retract the ram and piston assemblies to the open position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2287593 CA2287593C (en) | 1999-10-26 | 1999-10-26 | Hydraulic blowout preventer assembly for production wellhead |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2287593 CA2287593C (en) | 1999-10-26 | 1999-10-26 | Hydraulic blowout preventer assembly for production wellhead |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2287593A1 CA2287593A1 (en) | 2001-04-26 |
| CA2287593C true CA2287593C (en) | 2004-02-17 |
Family
ID=4164485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2287593 Expired - Lifetime CA2287593C (en) | 1999-10-26 | 1999-10-26 | Hydraulic blowout preventer assembly for production wellhead |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2287593C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7552765B2 (en) | 2006-01-27 | 2009-06-30 | Stream-Flo Industries Ltd. | Wellhead blowout preventer with extended ram for sealing central bore |
| US7673674B2 (en) | 2006-01-31 | 2010-03-09 | Stream-Flo Industries Ltd. | Polish rod clamping device |
| CN102121360A (en) * | 2010-12-31 | 2011-07-13 | 承德市开发区富泉石油机械有限公司 | Spring type gate locking mechanism |
-
1999
- 1999-10-26 CA CA 2287593 patent/CA2287593C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2287593A1 (en) | 2001-04-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6164619A (en) | Bi-directional sealing ram | |
| US5012865A (en) | Annular and concentric flow wellhead isolation tool | |
| US7533865B2 (en) | Blowout preventer operator locking system | |
| US9869159B2 (en) | Double valve block and actuator assembly including same | |
| US7637474B2 (en) | Fluid saving blowout preventer operator system | |
| US4811758A (en) | Pressurized check valve | |
| US7559523B2 (en) | Dual-cylinder blowout preventer operator system | |
| US6260817B1 (en) | Hydraulic blowout preventer assembly for production wellhead | |
| US20030221823A1 (en) | Wellhead isolation tool | |
| US4476933A (en) | Lubricator valve apparatus | |
| US6089321A (en) | Pressure balanced choke and kill line connector | |
| US6176466B1 (en) | Composite pumping tree with integral shut-off valve | |
| US6845958B2 (en) | Wireline valve actuator | |
| CA2287593C (en) | Hydraulic blowout preventer assembly for production wellhead | |
| US9234401B2 (en) | Nested cyclinder compact blowout preventer | |
| US10689937B1 (en) | Blowout preventer with pressure equalization block | |
| CN2512899Y (en) | High pressure oil-gas water well operation device with pressure | |
| US7121346B2 (en) | Intervention spool for subsea use | |
| CN201883990U (en) | Compensation type annular blowout preventing device | |
| US11353131B2 (en) | Gate valve bonnet connector | |
| EP1642001B1 (en) | Removable seal carrier for blowout preventer bonnet assembly | |
| CN220599763U (en) | Rotary blowout preventer | |
| CA2280581C (en) | Composite pumping tree with integral shut-off valve | |
| CN216157619U (en) | Blowout preventer dismounting tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20191028 |