EP0128206B1 - Flow diverter - Google Patents
Flow diverter Download PDFInfo
- Publication number
- EP0128206B1 EP0128206B1 EP84900253A EP84900253A EP0128206B1 EP 0128206 B1 EP0128206 B1 EP 0128206B1 EP 84900253 A EP84900253 A EP 84900253A EP 84900253 A EP84900253 A EP 84900253A EP 0128206 B1 EP0128206 B1 EP 0128206B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- piston
- wall
- housing
- hole
- diverter
- 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
- 239000012530 fluid Substances 0.000 claims abstract description 146
- 238000004891 communication Methods 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims description 116
- 238000012856 packing Methods 0.000 claims description 60
- 238000007789 sealing Methods 0.000 claims description 37
- 238000012163 sequencing technique Methods 0.000 claims description 7
- 239000012858 resilient material Substances 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims 3
- 238000007667 floating Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 241000282472 Canis lupus familiaris Species 0.000 description 5
- 238000012360 testing method Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 231100001261 hazardous Toxicity 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000013022 venting Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004459 forage Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
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
- E21B33/064—Blow-out preventers, i.e. apparatus closing around a drill pipe, e.g. annular blow-out preventers specially adapted for underwater well heads
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
-
- 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
- E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
- E21B21/10—Valve arrangements in drilling-fluid circulation systems
- E21B21/106—Valve arrangements outside the borehole, e.g. kelly valves
Definitions
- This invention generally relates to oil well diverter apparatus and systems, and more particularly to apparatus and systems for redirecting the flow of drilling fluid or mud and cuttings that would oterhwise be blown upward to the rig floor where unbalanced well bore pressures are encountered during initial hole drilling.
- the apparatus and system according to the invention may be used beneath the drilling floor of any land or marine drilling rig but in particular, the invention finds application with floating drilling equipment.
- blowout preventers typically of formation gas accumulations in the fluid of the conduit is often encountered in top hole drilling makinga flow diverter essential before blowout preventers are connected to the drilling system, especially for offshore applications.
- a flow diverter is considered necessary for safe operation on a floating offshore drilling rig where blowout preventers are placed on the sea floor only after the casing has been set to a depth, usually several hundred feet below the sea floor.
- Prior diverter systems have been primarily of two types.
- the first includes a flow diverter assembly requiring different diameter packing inserts to accommodate different diameter tubular members. Such diverter systems are unable to accomplish complete shut off on open hole.
- the second has included an annular blowout preventer placed above the vent line in which a valve is disposed to an open condition only when the annular blowout preventer is closed about the drill pipe or other object in the well bore in response to a kick in the annulus of the bore hole.
- packer elements In the first type of flow diverters, packer elements must be changed for different size tubulars used during drilling and must be removed during tripping of the bottom hole assembly. Such a task is rigorous drudgery to the rig personnel.
- the well bore is in general left unprotected when there is no object in the well bore because the diverter is not able to close on open hole.
- the combined height of the annular blowout preventer and of the side outlets of the vent line below the annular blowout preventer may require excessive head room under the rig floor.
- the present invention therefore provides apparatus adapted for use as a flow diverter for directing pressurized well bore fluid of a well bore away from a drilling rig via a diverter vent line, including a cylindrical housing having one or more outlet passages provided in its wall, the outlet passages connected for fluid communication with the diverter vent line, a packer in the housing having an annulus of resilient material, and closure means engaged with the packer and actuatable to apply radially inwardly directed pressure to the packer for sealing with a pipe or other object in the well bore or for closing the well bore in the absence of any object in the well bore, characterized by said closure means comprising a packer-actuating piston in fluid communication with the borehole within the housing and the piston having one or more passages for fluid communication between the borehole and the outlet passage provided in the housing wall.
- the present invention further provides a flow diverting system for diverting pressurized well bore fluid in a drilling conduit away from a drilling rig which has a rotary table mounted upon a support structure, wherein the system includes a support member mounted to said support structure beneath said rotary table and having a bore therethrough, a vent line means fixed to said support member for diverting fluid away from the drilling rig, and flow diverting apparatus having, a housing with a bore therethrough in communication with the conduit and having at least one outlet passage provided in its wall, means for supporting the housing within the bore of the support member, means for sealingly connecting the outlet passage in the housing wall with the vent line means fixed to the support member, a packer in the housing having an annulus of resilient material, said closure means for applying radially inwardly directed force to the packer for sealing with a pipe or other object in the well bore or to close the vertical flow path of the well bore in the absence of any object in the well bore, characterized by said closure means comprising annular piston in fluid communication with the bore through the housing and engaged with the
- One of the features of the invention is that no insert packers are required in the flow diverter to be changed for different size tubulars, thereby saving rig time, drudgery and operational decisions on the rig floor and in which flow may safely be diverted at any time, even when no object is in the diverter bore.
- Another advantageous feature of the present invention is that while it provides apparatus for sealing objects extending through the well bore of varying diameters (or even completely close the well bore where no object is in the well bore) it also eliminates the need for vent line placement below the diverter apparatus.
- a further aspect of the invention involves the provision of an extremely simple, safe system without external valves, operators, linkages and controls as well as one which can be easily installed below the drilling rig floor.
- a further preferred aspect of the invention involves the provision of a complete integral system requiring but one operation to achieve closing of the flow line to the rig drilling fluid system, opening of an overhead vent line and closing the vertical flow path of the annulus of the bore.
- Another preferred feature of the invention involves the provision of means for assuring autmomatic alignment of the flow diverter apparatus below a permanently installed housing, vent line and flow line.
- a further preferred aspect of the invention involves a system which on command safely and automatically opens a vent line and doses a flow line to the rig drilling fluid system before the annulus of the bore hole is closed.
- Figure 1 illustrates a prior art installation of an annular blowout preventer 10 used as a diverter in conjunction with a vent or "blowdown" line 11 and valve 20 for use during the drilling of the shallow portion of an oil or gas well.
- the purpose of the diverter apparatus is to divert pressurized flow in the annulus between the conductor conduit 14 and drill pipe 24 away from the rig and its personnel.
- the annular blowout preventer 10 is attached directly to the conduit 14 below the rig floor 16.
- One or more vent lines 11 are connected directly below the annular blowout preventer 10 and are sized to prevent excessive well bore back pressure buildup.
- a drilling spool 18 is provided to connect the vent line 11 and the annular blowout preventer 10 to conductor pipe 14.
- a kelly 22 is shown connected to drill pipe 24 either of which may extend through the bore of the annular blowout preventer 10.
- Flow line 26 provides normal return flow of drilling fluid which is pumped through the kelly 22 through drill pipe 24 to the drilling bit and up the annulus between the borehole or conductor pipe and the drill pipe 24. Flow line 26 empties into a mud tank, shale shaker, etc. to complete the drilling fluid circuit.
- Valve 20 has typically been provided as a full opening valve and is controlled via switch 28 which applies opening pressure to valve 20 as closing pressure is applied to blowout preventer 10. Operating pressure for the valves is provided by means of accumulator unit 30.
- FIG. 2 illustrates the flow diverter apparatus 100 according to the invention.
- Cylindrical housing 102 is provided for packing element 104 and piston 106.
- Cylindrical tube 108 is connected to housing 102 and has openings 110 for fluid communication between the bore 112 in diverter apparatus and the annulus 111 between the housing 102 and tube 108.
- Closing chamber 114 is provided for application of pressurized control fluid in order to urge piston 106 upwardly thereby closing packing element 104 about tubular or other objects 24 in the opening 112 or for completely closing off the bore 112.
- Opening chamber 116 is provided to return piston 106 to its normal position and to open packing element 104.
- Passages 118 are provided in piston wall 106 for providing fluid communication of the borehole fluid in the annular space between the housing 102 and tube 108.
- the passages 118 terminate in outlet holes 120 which advantageously are oblong in shape so as to reduce as much as possible the vertical dimension of the flow diverter apparatus 100.
- Cover 122 about housing wall 102 provides a fluid passageway from outlet hole 120 to vent line 11.
- Dimension L is provided for the housing of the diverter 100 so that it may be conveniently lowered through the opening of the rotary table to cover mounting framework 126 and attached cover 122 and vent line 11 which are preferably previously mounted below the drilling rig floor.
- Seals 124 are disposed in grooves about the housing wall for preventing fluid from leaking about the housing wall of the flow diverter apparatus.
- Figure 3 illustrates flow diverter apparatus 100 where piston 106 has been urged upwardly thereby causing packing element 104 to seal about tubular member 24. Borehole fluid is in communication with holes 120 via passages 118.
- FIG. 4 illustrates the flow diverter apparatus 100 connected to valve 20.
- Switch 28 opens valve 20 as hydraulic fluid is applied to diverter 100 for closing the packing element.
- the flow diverter apparatus 100 is shorter in vertical height than that of the prior art.
- the flow diverter apparauts 100 according to the invention therefore enjoys compactness of installation and provides an annular packing element which is adapted to close not only on any tubular in the borehole but also on open hole.
- FIG. 5 illustrates a drilling rig 220 of a floating drill ship, barge or semi-submersible 221.
- the diverter 222 is connected to a drilling conduit 230, in this case a ball or flex joint for connecting to a riser inner barrel 232.
- a telescopic joint 234 allows for the heave, surge and sway of the vessel and riserjoints 236 extend to the sea floor at which a well head member 238 is provided above a thirty (30) inch (76.2 cm) conduit 240 into the earth's surface.
- FIG. 5 also illustrates a vent line means 242 and a flow line means 243 which may be permanently provided and fixed to the housing 224. The connection of the flow diverter 222 to housing 224 and vent line and flow line means will be described in detail below.
- FIG 6 the preferred form of this second embodiment of a flow diverter and system according to the invention is disclosed.
- the diverter 222 is shown in placewithin a housing 224 which is mounted below the rig floor 244 in which the bore 246 of diverter 222 is in line with the bore of the rotary table 228.
- the width of the diverter 222 is advantageously designed so that it may be lowered through the rotary table into engagement with permanently affixed housing 224.
- Housing 224 is fixed with respect to the rig floor 244 by means of I beams 246 which are attached by support members 247 as illustrated.
- Diverter 222 comprises a generally cylindrical body 250 in which an annular packing element 252 is disposed in its upper part.
- the diverter includes a base 254 the upper part of which partially supports annular packing element 252.
- An annular space between the base 254 and the outer body 250, is provided to contain a first piston, outer valve sleeve 256, and a second piston, annular piston 258.
- Annular piston 258 is generally of the kind used in annular blowout preventers.
- the upper part 310 of piston 258 is in the shape of a conical bowl for engaging the packing element 252 in a conventional fashion.
- Head 260 forms the top part of the flow diverter and is connected to body 250 by means of studs 262.
- a spacer or wear ring 264 confines the packing element 252 within the flow diverter housing.
- the flow diverter fits within the bore of permanently mounted housing 224 and is attached by means of a latching mechanism thereto, such as multi-shouldered dogs 266 which engage complementary grooves in the diverter body 250.
- the dogs 266 are driven by a piston 268 and rod 270.
- a latch port 272 is provided for applying pressurized hydraulic fluid behind the piston 268 to drive dog 266 into engagement with the diverter body 250.
- An unlatch port 274 is provided for driving piston 268 away from the diverter body thereby unlatching the dogs 266.
- the area of the piston 268 on its latch side 269 is smaller than on its unlatch side 269' to facilitate unlatching even where the dogs have been jammed or stuck.
- Vent line means 280 and drilling fluid flow line means 282 are shown permanently attached to the housing 224, the attachment being, for example, by welds 283, but the flow line means may be attached advantageously by bolting or other attaching means.
- the vent line means 280 extends away from the drilling rig such that when the diverter opens the bore of the drilling conduit to the vent line, pressurized drilling fluid may be vented away from the drilling rig and, in the case of a drilling vessel, may be directed to the leeward side of the vessel.
- the flow line means 282 is preferably directed to the drilling fluid system of the drilling rig, most likely to the shale shaker, where drilling cuttings which have been washed by the drilling fluid are removed from the fluid and where the fluid may be re-entered into the drilling system in conventional fashion.
- the first piston or valve sleeve 256 is provided with two passages or holes 284 and 286 provided in its wall.
- the annular piston 258 has two holes 288 and 290 provided in its wall as illustrated in Figure 6.
- holes 292 and 294 are provided in the wall of the base 254.
- holes 296 and 298 are provided in the body wall 250 of the diverter and, after insertion in housing 224, are in alignment with the vent line means 280 and the flow line means 282.
- Figure 6 illustrates the flow diverter according to the invention in its normal state during which drilling operations are conducted through its bore and in which the return of the drilling fluid via the annulus is conducted.
- the bore of the diverter is provided for fluid communication with the bore of the drilling conduit attached beneath the diverter 222 as illustrated in Figure 5.
- Drilling fluid is returned to the drilling rig "mud" or fluid system via the hole 294 in the base, the hole 290 in the annular piston and thence through the hole 286 in the annular sleeve 256 and the hole 298 in the wall of the body for fluid communication through the flow line means to the drilling rig fluid system.
- the upper part 300 of the valve sleeve 256 covers the hole 296 provided in the body 250 such that no drilling fluid from the interior of the diverter is allowed to communicate with the vent line means 280.
- the annular packer 252 is in its normal relaxed position leaving an annular space between any pipe or object and the bore of the diverter and fluid communication exists between the bore of the diverter and the flow line means 282.
- Hydraulic fluid conduit 302 is connected to a source (not shown) of pressurized hydraulic control fluid via a port 304 for applying pressurized hydraulic fluid beneath valve sleeve piston 256 and annular piston 258.
- a port 304 for applying pressurized hydraulic fluid beneath valve sleeve piston 256 and annular piston 258.
- an operator may open port 304 to the source of pressurized hydraulic fluid wherein the pressurized fluid is applied to region 306 beneath the valve sleeve 256 and the annular piston 258.
- valve sleeve 256 is caused to move in an upward axial direction before the annular piston 258, because more area is provided underneath valve sleeve 256 than is provided under annular piston 258, because of the opposing effect of the annular packing element 252 on the conical bowl portion 310 of annular piston 258 and because it has less mass relative to annular piston 258 opposing the motion.
- hydraulic fluid under valve sleeve 256 and annular piston 258 drives valve sleeve 256 upward whereby the hole 286 in valve sleeve 256 is driven upwardly and out of alignment with the hole 298 in the bodywall.
- hole 284 in the wall of valve sleeve 256 is driven upwardly and into alignmentwith hole 296 in the wall of the body 250.
- the annular piston 258 begins to move after the valve sleeve 256 and in so doing the upper conical bowl portion 310 of piston 258 forces the packing element 252 radially inwardly.
- the upper surface 311 of the sleeve 256 is adapted to engage with downward facing shoulder 312 on the conical bowl portion 310 of piston 258 providing additional upward force to piston 258 until valve sleeve reaches its maximum upward travel.
- Piston 258 continues to move upwardly until the annulus between a drill pipe or other object in the well bore and the bore of the diverter is closed off.
- Figure 7 illustrates the diverter after the annular piston 258 and the valve sleeve 256 have moved to their "actuated" positions and have caused annular packing element 252 to close about pipe 312 in the bore of the diverter.
- Hole 284 of valve sleeve 256 has moved into alignment with hole 296 allowing fluid communication via hole 292 provided in the base of the diverter and the hole 288 provided in the annular piston 258 wall. Any pressurized drilling fluid in the bore of the diverter is safely diverted away from the drilling rig via vent line means 282.
- Hole 288 is sufficiently large that flow between the bore of the body via hole 292 is not prevented when piston 258 moves upwardly.
- valve sleeve 256 is shown in Figure 7 covering the hole 298 which is in alignment with the flow line means 282, thereby preventing further fluid communication between the bore of the diverter and the flow line means 282 to the drilling fluid system. Closing of the flow line means 282 thereby prevents the flow of possibly highly combustible, pressurized drilling fluid to the rig drilling fluid system.
- the fluid system may be in a confined part of the drilling vessel and could create an extremely hazardous condition if the flow of drilling fluid pressurized with gas from an underground formation is not terminated as quickly as possible.
- anotherfeature of the invention includes a means by which the valve sleeve 256 is prevented from failing to close the flow line means 282 and to open the vent line means 280 during kick.
- a ring 314 provided in the lower part of the annular piston 258 is provided for engagement with an annular shoulder 316 ofvalve sleeve 256. If the valve sleeve 256 were to become stuck and fail to move upwardly on the application of hydraulic fluid beneath its area 306, the ring 314 of piston 254 on its upward movement would engage the shou Ider 316, thereby forcing the valve sleeve 316 upwardly.
- the ring 314 would force sleeve 256 upward until hole 284 becomes aligned with hole 296 thereby opening the bore of the diverter to the vent line means 296 and simultaneously causing the lower part of the valve sleeve 256 to cover hole 298 in the bore of the diverter thereby preventing further fluid communication to the drilling rig fluid system.
- Hydraulic line 320 is provided via port 322 for connection to a source of pressurized hydraulic control fluid to an area 326 above a shoulder provided in the bottom of the valve sleeve 256.
- Hydraulic line 320 is provided via port 322 for connection to a source of pressurized hydraulic control fluid to an area 326 above a shoulder provided in the bottom of the valve sleeve 256.
- a plurality of sealing means are provided to contain either pressurized hydraulic fluid under the valve sleeve 256 and annular piston 258 or to seal about other openings and holes in the pistons and body walls.
- sealing means 321 and 322 prevent pressurized hydraulic fluid beneath valve sleeve 256 from escaping into the interior of the diverter.
- valve sealing means 324 and 326 seal against loss of hydraulic fluid beneath annular piston 258.
- Sealing means 330 and 332 provide sealing for the upper conical bowl section 310 of annular piston 258 as it moves upwardly for forcing annular packing element radially inward.
- Integral seals 340 are provided on the wall 250 of the diverter 222 for sealing the wall 250 of the diverter against the wall of the permanent housing 224 and also for providing a seal with the valve sleeve 256 as it moves across the openings 296 and 298 in the wall of the body.
- FIG. 8 shows a portion of a cross-section through the line 8-8 shown in Figure 6, means are provided for aligning the diverter 222 within the permanently mounted housing 224.
- the diverter is adapted to be lowered by the drilling rig travelling block through the rotary table and into the bore of housing 224.
- Means are provided for aligning the diverter 222 both axially and angularly such that the holes 296 and 298 are in alignment with the permanently mounted vent line means 280 and the flow line means 282 which are permanently attached to the housing 224.
- Axial alignment is achieved by providing an inwardly facing annular shoulder 350 in the permanent housing 224 and a complementary outwardly facing shoulder 351. Engagement of the complementary shoulders 350 and 351 causes the diverter to come to rest at the proper axial or vertical alignment within the housing 224.
- Angular alignment is accomplished by means of an alignment key 360 extending through the wall 250, the valve sleeve 256 and the annular piston 258 into engagement with base 254.
- the head 362 of the key 360 partially extends outwardly from the wall 250 for engagement into an axial slot 364 provided in a portion of the wall of housing 224.
- the key 360 serves to prevent angular rotation of valve sleeve 256 and annular piston 258 thereby insuring that the holes 284 and 286 of the valve sleeve 256 and the holes 288 and 290 of the annular piston 258 do not move out of angular alignment once the diverter is in place within the permanent housing 224.
- Slot 365 illustrated in Figure 8A is provided in the key 360 so that drilling fluid within the annular space extending between the holes 292 and 294 of the base 254 and holes 288 and 290 of the annular piston 258 is not impeded from moving up or down by the key itself, but rather may move freely through the key.
- the hydraulic fluid ports 304 and 322 are also aligned with openings 370 and 372 in the body 250 of the diverter 222 when the alignment key head 362 fits within alignment slot 364 of the permanent housing 224. Sealing means 380 and 382 provide a seal about the hydraulic fluid opening 370 while seal means 384 and 386 seal about the opening 372 with respect to the permanent housing 224 wall.
- FIG. 6 the position of key 360 is seen when the diverter is in a normal, not actuated condition.
- the slots 390 and 392 illustrate the slots in the first piston or valve sleeve 256 and second piston or annular piston 258 which allow the sleeve and piston to move with respect to the fixed key 360.
- Figure 7 illustrates the position of key 360 as the valve sleeve 256 and annular piston 258 have been moved upwardly during an emergency situation.
- annular space 400 which is provided to accept a test tool, thereby simulating a test pipe or other object extending through the bore of the housing about which the annular packing unit 252 may be closed in order to test the operation of the diverter.
- Figures 9 through 14 illustrate the integral seal 340 provided in the wall 250 of the diverter 222.
- the seal is adapted to be affixed within the wall about the opening 296 or the opening 298 in the body wall.
- the holes 296 and 298 are oblong on the interior of the body wall while circular on the exterior of the wall.
- the purpose for providing such a passage through the body wall is to miminize the height of the hole in the interior of the body wall while maintaining a maximum area of the outlet passage so as not to hinder significantly the flow therethrough thereby preventing creation of potentially hazardous back pressure during emergency venting.
- vent line means 280 and the flow line means 282 normally are cylindrical tubular members having a circular opening, thereby requiring that the outlet onthe exterior wall of the diverter be circular in shape.
- an integral sealing member 340 is provided about the opening in the body wall which is advantageously provided to seal against the permanent housing on the exterior of the diverter wall and against the valve sleeve 256 movement on the interior of the diverter wall.
- the seal is embodied in a molded or cast member which may be easily manufactured obviating the necessity of machining two unusually shaped holes in each diverter housing which are costly and relatively difficult to machine.
- sealing member 340 is preferably an integral member of elastomeric material and preferably has a support member embedded therein to give it strength.
- sealing member 340 may be an integral member fabricated from non-elastomer materials. For example, it may be cast steel, ceramic or a composite material.
- Figure 9 illustrates the seal member as viewed from its exterior side showing the opening 341 on its outside being circular in nature and showing the interior oblong hole 342. Exterior sealing rings 343 are shown for sealing the permanent housing 342 against the exterior of the body diverter.
- Figure 12 shows the sealing element as viewed from the inside of the diverter showing the interior opening 342 being of oblong shape in which the height of the opening is less than its width.
- the exterior circular opening 341 is also illustrated.
- Interior sealing ridge 344 is provided for sealing against the valve sleeve 256 as it either comes into alignment with the opening 342 or seals the opening with an upper part of the sleeve where the vent line means is covered or the lower part of the piston where the flow line means is covered.
- Sealing shoulder 345 is provided for sealing the seal assembly 340 to the housing wall 250.
- Figure 10 illustrates the shape of the seal element when viewed from its side in which the oblong opening 342 is shown as well as the circular opening 341.
- a metallic support member 390 is provided in the seal element 340 and extends completely about the warped surface defined by the member connecting the circular opening 341 withthe oblong opening 342.
- Figures 13 and 14 illustrate in cross-section how the support element 390 is preferably disposed within the sealing element itself.
- Figures 15A and 15B show a further alternative embodiment of the flow diverter according to the invention.
- Figure 15A shows the flow diverter in its normal or relaxed state.
- Figure 15B shows it in the activated or diverting state.
- Flow diverter 222' is shown within permanently fixed housing 224 having a flow line means 282 and a vent line means 280 affixed to the housing.
- the diverter 222' has a body 250 and a base member 254'.
- the holes 296 and 298 are provided in the body wall for alignment with the vent line means 280 and the flow line means 282.
- a valve sleeve 256' and an annular piston 258' are provided in addition to the annular packing element 252 in the upper part of the diverter 222'.
- valve sleeve 256' and annular piston 258' similar to that shown in the second embodiment of the invention shown in Figure 6, but alternative sequencing means are provided for insuring that the valve sleeve 256' moves upwardly for closing the hole 298 to the flow line means and opening the hole 296 to the vent line means before the piston 258' is enabled to force the annular packing element 252 about a pipe or other object in the well bore or complete shut off on open hole.
- the sequencing means includes means for connecting a source of pressurized hydraulic pressure via conduit 500 initially solely under the valve sleeve 256'.
- a source of pressurized hydraulic pressure via conduit 500 initially solely under the valve sleeve 256'.
- the valve sleeve moves upwardly and comes to a final position such that the lower part of valve sleeve 256' covers hole 298 and the hole 284' in the wall of the valve sleeve comes into alignment with the vent line means 280, a port 502 hecomes uncovered, allowing the pressurized hydraulic fluid to be provided under the annular piston 258' thereby driving it upwardly and causing annular packing element 252 to close about a pipe or other object in the well bore or to completely close the annulus of the well bore in the absence of an object in the bore.
- a check valve 503 is provided such that when pressurized hydraulic fluid is provided in conduit 505 in order to force the valve sleeve 256' downwardly, the downward movement of annular piston 258' forces hydraulic fluid- down through conduit 506 and check valve 503 thereby relieving the pressure under annular piston 258'.
- Figures 16A and 16B illustrate another alternative embodiment of the diverter according to the invention.
- Figure 16A shows the diverter in its rest state;
- Figure 16B shows the diverter in the diverting state with the packing element closing about the bore with no object therein.
- the diverter 222 is adapted to fit within the bore of a permanently fixed housing 224 below the rig floor of a drilling rig and above a drilling conduit.
- Flow line means 282 and vent line means 280 are provided for connection respectively to the drilling fluid system and for conducting pressurized fluid away from the drilling rig during an emergency.
- two pistons are provided by which a first piston 600 it has two holes provided in its wall. Hole.605 is normally in alignment with the flow line means 282 while hole 602 is normally below the opening 603 in the wall of the diverter 222.
- a second piston 610 is provided generally above the first piston 600 for engagement with the packing element 222.
- the means by which the sequencing of the first piston is forced upwardly before the second piston 610 is enabled to engage the packing element 222 is embodied by the upper head 621 of the first piston adapted for engagement with a lower shoulder 622 provided generally under the second piston 610.
- a point is reached where the head 621 of the first piston 600 comes into engagement with the downward facing shoulder 622 of the second piston 610 whereby further upward movement of piston 600 is transmitted via piston 610 to annular packing element 222 forcing it radially inward for closing about a pipe or other object disposed in the bore therein.
- Figure 16B illustrates the diverter in the closed position where the packing element has completely closed about the bore of the diverter.
- the first piston 600 has moved upwardly such that the flow line means 282 has been closed and the vent line means 280 has been opened.
- Means for returning the pistons of the diverter to their normal position is provided via conduit 623 through which a source of pressurized hydraulic control fluid forces the first piston 600 back to its normal state.
- Piston 610 returns to its normal state because of gravity and because the packing element acts to return it to its relaxed state.
- a mechanical means is provided for insuring that the pistons 600 and 610 sequence in operation such that the annulus of the diverter is not closed before the flow line means is closed and the vent line means is opened.
- FIG 17A illustrates another embodiment of the flow diverter 222 in which a single piston 700 is provided not only for closing the annular packing element 252 about an object in the bore of the diverter but also for closing a flow line means 282 an opening a vent line means 280 during an emergency.
- the single piston 700 has an upper conical bowl portion 702 adapted for engagement with the packing element 252 and forcing it radially inward as the piston 700 moves axially upward.
- a hole 710 in the piston wall is normally in alignment with a hole 712 in the body 250 of the diverter 222.
- the second hole 713 in the body wall, provided in alignment with the vent line means 280, is covered by the piston 700 wall when the diverter is in its normal state.
- Means are provided for insuring that the packing element 252 does not close about a pipe or other object in the bore hole before hole 712 is covered and hole 713 is opened by providing a space 730 above the packing element through which the packing element is free to move axially upward without being forced radially inward as the upper conical portion 702 of the piston 700 moves up.
- a means is provided by which the vent line means 280 is opened and the flow line means 282 is closed from fluid communication with the bore of the flow diverter 222 before the annular packing element 252 is enabled to fully close about a pipe or other object in the bore hole or to completely close the bore of the diverter 222 in the absence of an object in the bore.
- the flow line means 282 may not be provided in the wall of the piston at all, there being provided a flow line means 282' above the diverter through which the flow is normally directed to the fluid system of the drilling rig.
- a single passage such as hole 713 of Figure 13A to the vent line means is provided which is normally covered by the piston 700.
- the packing element serves to close all fluid communication to the flow line means, the vent line means serving to divert the flow of pressurized drilling fluid as the piston moves upwardly.
- Figure 17C illustrates an alternative embodiment of the diverter illustrated in Figure 17A where piston 700 is required to move upward before hole 713' provided in body 250 is opened.
- a diverter adapted for insertion into a permanently fixed housing connected to a drilling rig.
- the diverter in a single apparatus, provides a substantially failsafe means for closing the bore of a drilling concuit to which the diverter is attached and for closing the flow line to the drilling fluid system of the rig and opening a vent line for diverting pressurized drilling fluid away from the drilling rig.
- Means have been provided to insure that the vent line is opened and the flow line to the shale shaker is closed before the annular packing element closes the annulus of the bore about a pipe or other object in the well. Sealing means by which the holes in the wall of the diverter are sealed interiorly to a piston moving past the hole and exteriorly to the permanent housing are also disclosed.
- the flow diverter according to the invention is failsafe in that it eliminates the need for external valves in the vent line downstream of the connection of the vent line to the permanent housing of the diverter.
- Such valves as indicated in the background section above, have been the source of negligence and failure when used with prior diverting systems, causing loss of property and injury to personnel.
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Mechanical Engineering (AREA)
- Earth Drilling (AREA)
- Fluid-Driven Valves (AREA)
Abstract
Description
- This invention generally relates to oil well diverter apparatus and systems, and more particularly to apparatus and systems for redirecting the flow of drilling fluid or mud and cuttings that would oterhwise be blown upward to the rig floor where unbalanced well bore pressures are encountered during initial hole drilling. In general, the apparatus and system according to the invention may be used beneath the drilling floor of any land or marine drilling rig but in particular, the invention finds application with floating drilling equipment.
- When drilling an oil or gas well, an initial large diameter bore hole is established to shallow depths. Protective drive conduit or conductor pipe, typically thirty (30) inches (76.2 cm) in diameter, is secured in the shallow bore through which the drilling takes place. For offshore drilling, a subsea riser extends from the sea floor to the marine drilling platform. Flow diverters are typically provided below the rig floor and between the conductor conduit and the rotary table of the drilling rig for the purpose of safely venting unbalanced well bore pressure which may produce an upward flow of drilling fluid in the conduit having sufficient impetus to issue from the top of the conduit thereby contributing a hazard to personnef and equipment. Such an occurrence, called a "kick", typically of formation gas accumulations in the fluid of the conduit is often encountered in top hole drilling makinga flow diverter essential before blowout preventers are connected to the drilling system, especially for offshore applications. A flow diverter is considered necessary for safe operation on a floating offshore drilling rig where blowout preventers are placed on the sea floor only after the casing has been set to a depth, usually several hundred feet below the sea floor.
- Prior diverter systems have been primarily of two types. The first includes a flow diverter assembly requiring different diameter packing inserts to accommodate different diameter tubular members. Such diverter systems are unable to accomplish complete shut off on open hole. The second has included an annular blowout preventer placed above the vent line in which a valve is disposed to an open condition only when the annular blowout preventer is closed about the drill pipe or other object in the well bore in response to a kick in the annulus of the bore hole.
- In the first type of flow diverters, packer elements must be changed for different size tubulars used during drilling and must be removed during tripping of the bottom hole assembly. Such a task is rigorous drudgery to the rig personnel. The well bore is in general left unprotected when there is no object in the well bore because the diverter is not able to close on open hole.
- In the second type of flow diverter system the combined height of the annular blowout preventer and of the side outlets of the vent line below the annular blowout preventer may require excessive head room under the rig floor.
- For both types of systems which have been provided in the past, significant safety problem has arisen due to the requirement of opening an external valve in the vent line and closing the valve leading typically to the shale shaker of the drilling rig fluid system. In the past, such valves have often been closed by rig personnel while testing the flow diverter, but after the flow diverter has been made operational during drilling, the external valves inadvertently have been allowed to remain closed. On occasion, the control system elements have been inadvertently incorrectly connected resulting in simultaneous closure of all of the diverter system valves and the diverter itself. If the prior flow diverters have closed about the annulus of a drill pipe or other object in the well bore, such flow diverter systems have created an extremely dangerous situation, and in fact is some cases they have explode with the result of loss of life and property.
- The document by G. Soulié "technologie des tetes de puits sous-marines de forage" 1978, Editions Technip. Paris, pages 203-206 discloses a flow diverter in a cylindrical housing having one or more outlet passages provided in its walls, a dual-element packer in the housing having annuli of resilient material and hydraulic fingers engaged with one of the packers for providing inwardly directed pressure to seal the well. It appears that external valves (not shown) are employed to simultaneously open a vent line upon closure of the well introducing the possibility that the vent line could inadvertently remain closed upon closure of the well by the packer.
- It is generally desired herein to provide a diverting system which is failsafe; that is, when a kick occurs during drilling of a shallow hole well before a blowout preventer has been provided, that kick cannot be accidentally confined by the flow diverter apparatus itself to build pressure and explode, even if controls are misconnected or malfunctioning. Further, it is desired to provide an improved diverting system wherein actuation of the flow diverter to seal the well will simultaneously open a vent line without any need to separately actuate an external valve(s).
- The present invention therefore provides apparatus adapted for use as a flow diverter for directing pressurized well bore fluid of a well bore away from a drilling rig via a diverter vent line, including a cylindrical housing having one or more outlet passages provided in its wall, the outlet passages connected for fluid communication with the diverter vent line, a packer in the housing having an annulus of resilient material, and closure means engaged with the packer and actuatable to apply radially inwardly directed pressure to the packer for sealing with a pipe or other object in the well bore or for closing the well bore in the absence of any object in the well bore, characterized by said closure means comprising a packer-actuating piston in fluid communication with the borehole within the housing and the piston having one or more passages for fluid communication between the borehole and the outlet passage provided in the housing wall.
- The present invention further provides a flow diverting system for diverting pressurized well bore fluid in a drilling conduit away from a drilling rig which has a rotary table mounted upon a support structure, wherein the system includes a support member mounted to said support structure beneath said rotary table and having a bore therethrough, a vent line means fixed to said support member for diverting fluid away from the drilling rig, and flow diverting apparatus having, a housing with a bore therethrough in communication with the conduit and having at least one outlet passage provided in its wall, means for supporting the housing within the bore of the support member, means for sealingly connecting the outlet passage in the housing wall with the vent line means fixed to the support member, a packer in the housing having an annulus of resilient material, said closure means for applying radially inwardly directed force to the packer for sealing with a pipe or other object in the well bore or to close the vertical flow path of the well bore in the absence of any object in the well bore, characterized by said closure means comprising annular piston in fluid communication with the bore through the housing and engaged with the packer, actuating means for urging the piston axially upward within the housing, whereby, when said piston is not actuated, the piston covers the outlet passage in the housing wall thereby preventing fluid communication between the interior of the piston and the vent line means, and when said piston is actuated, the piston uncovers the outlet passage in the housing wall allowing fluid communication between the interior of the piston and vent line means.
- One of the features of the invention is that no insert packers are required in the flow diverter to be changed for different size tubulars, thereby saving rig time, drudgery and operational decisions on the rig floor and in which flow may safely be diverted at any time, even when no object is in the diverter bore.
- Another advantageous feature of the present invention is that while it provides apparatus for sealing objects extending through the well bore of varying diameters (or even completely close the well bore where no object is in the well bore) it also eliminates the need for vent line placement below the diverter apparatus.
- A further aspect of the invention involves the provision of an extremely simple, safe system without external valves, operators, linkages and controls as well as one which can be easily installed below the drilling rig floor.
- It is a further feature of the invention to provide a flow diverting apparatus which, on the occurrence of a kick in the annulus of a drilling conduit, may be caused to close the flow line to the drilling fluid system, to open a vent line for diverting drilling fluid away from the rig and to close the annulus of the bore about a drilling pipe or other object in the conduit or on open hole.
- In a preferred aspect of the invention not only is the opening of a vent line and the closing of the line to the rig drilling fluid system accomplished but also the vertical flow path of the bore is completely closed in the absence of pipe or other object in the bore.
- A further preferred aspect of the invention involves the provision of a complete integral system requiring but one operation to achieve closing of the flow line to the rig drilling fluid system, opening of an overhead vent line and closing the vertical flow path of the annulus of the bore.
- Another preferred feature of the invention involves the provision of means for assuring autmomatic alignment of the flow diverter apparatus below a permanently installed housing, vent line and flow line.
- A further preferred aspect of the invention involves a system which on command safely and automatically opens a vent line and doses a flow line to the rig drilling fluid system before the annulus of the bore hole is closed.
- Further features and advantages of the invention will become more apparent by reference to the accompanying drawings illustrating preferred embodiments of the invention and wherein:
- Figure 1 illustrates a prior art flow diverter system in which an annular blowout preventer is placed above a vent line above a conventional conductor pipe;
- Figure 2 illustrates a first preferred embodiment of flow diverter apparatus according to the invention having passages for fluid communication from the bore hole to outlet holes in the housing wall;
- Figure 3 illustrates the flow diverter apparatus of Figure 2 in a closed position having its packing element closed about a tubular member in the bore hole; and
- Figure 4 illustrates the flow diverter apparatus of Figure 2 with a vent line and valve connected to the outlet holes in its housing;
- Figure 5 illustrates a drilling rig of a floating drill ship, barge or semi-submersible to which a second preferred embodiment of diverting apparatus according to the invention is attached beneath the rig floor and above drilling conduit extending to the subsea surface;
- Figure 6 illustrates the second preferred form of the flow diverting apparatus of Figure 5 in place within a housing and connected to vent and flow lines where the housing and vent lines are fixed beneath a drilling rig floor;
- Figure 7 illustrates the flow diverting apparatus of Fig. 6 in which an annular packing element has been closed about a pipe in the bore of the apparatus and in which a vent line has been opened and a flow line has been closed;
- Figure 8 illustrates an alignment key according to the invention by which the flow diverter may be inserted into a permanent housing and aligned angularly with respect to the permanent housing;
- Figure 8A illustrates in more detail the alignment key shown in Figure 8;
- Figures 9 through 14 illustrate in various views and cross-sections a seal used to seal about an opening in the apparatus extending to either the vent line or flow line of the invention;
- Figures 15A and 15B illustrate a third alternative embodiment of the flow diverter in which two pistons are provided, a first piston serving to open and close the vent and flow lines, the second piston serving to urge the annular packing element radially inwardly and alternative, and sequencing means for insuring that the first piston moves before the second piston moves up;
- Figures T6A and 16B show a fourth embodiment of the flow diverter in which two pistons are used to insure that the flow line to the shale shaker is closed and the vent line provided to flow pressurized fluid away from the drilling rig floor is open before the annular packing unit is closed about a pipe or other object in the bore hole;
- Figure 17A illustrates a fifth embodiment of the flow diverter apparatus in which a single piston serves to not only close the annular packing unit but also to simultaneously close the flow line and open the vent line before the packing unit may be closed; and
- Figures 17B and 17C illustrate the single piston diverter of Figure 17A having a single opening to the vent line, a flow line to the rig fluid system being provided above the diverter.
- Figure 1 illustrates a prior art installation of an
annular blowout preventer 10 used as a diverter in conjunction with a vent or "blowdown"line 11 andvalve 20 for use during the drilling of the shallow portion of an oil or gas well. The purpose of the diverter apparatus is to divert pressurized flow in the annulus between theconductor conduit 14 anddrill pipe 24 away from the rig and its personnel. - The
annular blowout preventer 10 is attached directly to theconduit 14 below therig floor 16. One ormore vent lines 11 are connected directly below theannular blowout preventer 10 and are sized to prevent excessive well bore back pressure buildup. Adrilling spool 18 is provided to connect thevent line 11 and theannular blowout preventer 10 toconductor pipe 14. A kelly 22 is shown connected todrill pipe 24 either of which may extend through the bore of theannular blowout preventer 10. -
Flow line 26 provides normal return flow of drilling fluid which is pumped through thekelly 22 throughdrill pipe 24 to the drilling bit and up the annulus between the borehole or conductor pipe and thedrill pipe 24.Flow line 26 empties into a mud tank, shale shaker, etc. to complete the drilling fluid circuit. - Valve 20 has typically been provided as a full opening valve and is controlled via
switch 28 which applies opening pressure tovalve 20 as closing pressure is applied toblowout preventer 10. Operating pressure for the valves is provided by means ofaccumulator unit 30. - Figure 2 illustrates the
flow diverter apparatus 100 according to the invention.Cylindrical housing 102 is provided forpacking element 104 andpiston 106.Cylindrical tube 108 is connected tohousing 102 and hasopenings 110 for fluid communication between thebore 112 in diverter apparatus and theannulus 111 between thehousing 102 andtube 108.Closing chamber 114 is provided for application of pressurized control fluid in order to urgepiston 106 upwardly thereby closingpacking element 104 about tubular orother objects 24 in theopening 112 or for completely closing off thebore 112.Opening chamber 116 is provided to returnpiston 106 to its normal position and to openpacking element 104. -
Passages 118 are provided inpiston wall 106 for providing fluid communication of the borehole fluid in the annular space between thehousing 102 andtube 108. Thepassages 118 terminate in outlet holes 120 which advantageously are oblong in shape so as to reduce as much as possible the vertical dimension of theflow diverter apparatus 100. Cover 122 abouthousing wall 102 provides a fluid passageway fromoutlet hole 120 to ventline 11. Dimension L is provided for the housing of thediverter 100 so that it may be conveniently lowered through the opening of the rotary table to cover mountingframework 126 and attachedcover 122 and ventline 11 which are preferably previously mounted below the drilling rig floor.Seals 124 are disposed in grooves about the housing wall for preventing fluid from leaking about the housing wall of the flow diverter apparatus. - Figure 3 illustrates
flow diverter apparatus 100 wherepiston 106 has been urged upwardly thereby causingpacking element 104 to seal abouttubular member 24. Borehole fluid is in communication withholes 120 viapassages 118. - Figure 4 illustrates the
flow diverter apparatus 100 connected tovalve 20.Switch 28 opensvalve 20 as hydraulic fluid is applied todiverter 100 for closing the packing element. - Thus, the
flow diverter apparatus 100 is shorter in vertical height than that of the prior art. The flow diverterapparauts 100 according to the invention therefore enjoys compactness of installation and provides an annular packing element which is adapted to close not only on any tubular in the borehole but also on open hole. - Figure 5 illustrates a
drilling rig 220 of a floating drill ship, barge or semi-submersible 221. A second embodiment of a flow diverter in accordance with the invention shown generally at 222 and is provided below thedrilling rig 220 is in a permanently installedhousing 224 which is mounted below the rotary table 228 of thedrilling rig 220. Thediverter 222 is connected to adrilling conduit 230, in this case a ball or flex joint for connecting to a riserinner barrel 232. Typically in a drilling system of a floating vessel, a telescopic joint 234allows for the heave, surge and sway of the vessel andriserjoints 236 extend to the sea floor at which awell head member 238 is provided above a thirty (30) inch (76.2 cm)conduit 240 into the earth's surface. - It should be emphasized that while the preferred environment in which the flow diverter and system according to the invention are illustrated is with marine drilling from a floating vessel, the invention may also be used for marine drilling from a bottom supported platform or for land drilling from a land based rig. Figure 5 also illustrates a vent line means 242 and a flow line means 243 which may be permanently provided and fixed to the
housing 224. The connection of theflow diverter 222 tohousing 224 and vent line and flow line means will be described in detail below. - Turning now to Figure 6, the preferred form of this second embodiment of a flow diverter and system according to the invention is disclosed. The
diverter 222 is shown in placewithin ahousing 224 which is mounted below therig floor 244 in which thebore 246 ofdiverter 222 is in line with the bore of the rotary table 228. The width of thediverter 222 is advantageously designed so that it may be lowered through the rotary table into engagement with permanently affixedhousing 224.Housing 224 is fixed with respect to therig floor 244 by means of I beams 246 which are attached bysupport members 247 as illustrated. -
Diverter 222 comprises a generallycylindrical body 250 in which anannular packing element 252 is disposed in its upper part. The diverter includes a base 254 the upper part of which partially supportsannular packing element 252. An annular space between the base 254 and theouter body 250, is provided to contain a first piston,outer valve sleeve 256, and a second piston,annular piston 258.Annular piston 258 is generally of the kind used in annular blowout preventers. Theupper part 310 ofpiston 258 is in the shape of a conical bowl for engaging thepacking element 252 in a conventional fashion.Head 260 forms the top part of the flow diverter and is connected tobody 250 by means ofstuds 262. A spacer or wearring 264 confines thepacking element 252 within the flow diverter housing. - The flow diverter according to the invention fits within the bore of permanently mounted
housing 224 and is attached by means of a latching mechanism thereto, such asmulti-shouldered dogs 266 which engage complementary grooves in thediverter body 250. Thedogs 266 are driven by apiston 268 and rod 270. Alatch port 272 is provided for applying pressurized hydraulic fluid behind thepiston 268 to drivedog 266 into engagement with thediverter body 250. Anunlatch port 274 is provided for drivingpiston 268 away from the diverter body thereby unlatching thedogs 266. Advantageously, the area of thepiston 268 on itslatch side 269 is smaller than on its unlatch side 269' to facilitate unlatching even where the dogs have been jammed or stuck. - Flow lines are permanently mounted with
housing 224 according to the invention. Vent line means 280 and drilling fluid flow line means 282 are shown permanently attached to thehousing 224, the attachment being, for example, bywelds 283, but the flow line means may be attached advantageously by bolting or other attaching means. The vent line means 280 extends away from the drilling rig such that when the diverter opens the bore of the drilling conduit to the vent line, pressurized drilling fluid may be vented away from the drilling rig and, in the case of a drilling vessel, may be directed to the leeward side of the vessel. The flow line means 282 is preferably directed to the drilling fluid system of the drilling rig, most likely to the shale shaker, where drilling cuttings which have been washed by the drilling fluid are removed from the fluid and where the fluid may be re-entered into the drilling system in conventional fashion. - According to the invention, the first piston or
valve sleeve 256 is provided with two passages orholes annular piston 258 has twoholes base 254. Likewise, holes 296 and 298 are provided in thebody wall 250 of the diverter and, after insertion inhousing 224, are in alignment with the vent line means 280 and the flow line means 282. - Figure 6 illustrates the flow diverter according to the invention in its normal state during which drilling operations are conducted through its bore and in which the return of the drilling fluid via the annulus is conducted. The bore of the diverter is provided for fluid communication with the bore of the drilling conduit attached beneath the
diverter 222 as illustrated in Figure 5. Drilling fluid is returned to the drilling rig "mud" or fluid system via thehole 294 in the base, thehole 290 in the annular piston and thence through thehole 286 in theannular sleeve 256 and thehole 298 in the wall of the body for fluid communication through the flow line means to the drilling rig fluid system. On the other hand, theupper part 300 of thevalve sleeve 256 covers thehole 296 provided in thebody 250 such that no drilling fluid from the interior of the diverter is allowed to communicate with the vent line means 280. Thus, during normal drilling operations theannular packer 252 is in its normal relaxed position leaving an annular space between any pipe or object and the bore of the diverter and fluid communication exists between the bore of the diverter and the flow line means 282. - Hydraulic fluid conduit 302 is connected to a source (not shown) of pressurized hydraulic control fluid via a
port 304 for applying pressurized hydraulic fluid beneathvalve sleeve piston 256 andannular piston 258. During a "kick", an operator may openport 304 to the source of pressurized hydraulic fluid wherein the pressurized fluid is applied toregion 306 beneath thevalve sleeve 256 and theannular piston 258. - According to the invention, the
valve sleeve 256 is caused to move in an upward axial direction before theannular piston 258, because more area is provided underneathvalve sleeve 256 than is provided underannular piston 258, because of the opposing effect of theannular packing element 252 on theconical bowl portion 310 ofannular piston 258 and because it has less mass relative toannular piston 258 opposing the motion. During a kick, hydraulic fluid undervalve sleeve 256 andannular piston 258 drivesvalve sleeve 256 upward whereby thehole 286 invalve sleeve 256 is driven upwardly and out of alignment with thehole 298 in the bodywall. Simultaneously,hole 284 in the wall ofvalve sleeve 256 is driven upwardly and intoalignmentwith hole 296 in the wall of thebody 250. - The
annular piston 258 begins to move after thevalve sleeve 256 and in so doing the upperconical bowl portion 310 ofpiston 258 forces the packingelement 252 radially inwardly. Asvalve sleeve 256 moves upwardly, theupper surface 311 of thesleeve 256 is adapted to engage with downward facingshoulder 312 on theconical bowl portion 310 ofpiston 258 providing additional upward force topiston 258 until valve sleeve reaches its maximum upward travel.Piston 258 continues to move upwardly until the annulus between a drill pipe or other object in the well bore and the bore of the diverter is closed off. - Figure 7 illustrates the diverter after the
annular piston 258 and thevalve sleeve 256 have moved to their "actuated" positions and have causedannular packing element 252 to close aboutpipe 312 in the bore of the diverter.Hole 284 ofvalve sleeve 256 has moved into alignment withhole 296 allowing fluid communication viahole 292 provided in the base of the diverter and thehole 288 provided in theannular piston 258 wall. Any pressurized drilling fluid in the bore of the diverter is safely diverted away from the drilling rig via vent line means 282.Hole 288 is sufficiently large that flow between the bore of the body viahole 292 is not prevented whenpiston 258 moves upwardly. - The
lower part 314 ofvalve sleeve 256 is shown in Figure 7 covering thehole 298 which is in alignment with the flow line means 282, thereby preventing further fluid communication between the bore of the diverter and the flow line means 282 to the drilling fluid system. Closing of the flow line means 282 thereby prevents the flow of possibly highly combustible, pressurized drilling fluid to the rig drilling fluid system. For the case of a floating drilling rig, the fluid system may be in a confined part of the drilling vessel and could create an extremely hazardous condition if the flow of drilling fluid pressurized with gas from an underground formation is not terminated as quickly as possible. - As best shown in Figure 6, anotherfeature of the invention includes a means by which the
valve sleeve 256 is prevented from failing to close the flow line means 282 and to open the vent line means 280 during kick. Aring 314 provided in the lower part of theannular piston 258 is provided for engagement with anannular shoulder 316ofvalve sleeve 256. If thevalve sleeve 256 were to become stuck and fail to move upwardly on the application of hydraulic fluid beneath itsarea 306, thering 314 ofpiston 254 on its upward movement would engage theshou Ider 316, thereby forcing thevalve sleeve 316 upwardly. Thering 314 would forcesleeve 256 upward untilhole 284 becomes aligned withhole 296 thereby opening the bore of the diverter to the vent line means 296 and simultaneously causing the lower part of thevalve sleeve 256 to coverhole 298 in the bore of the diverter thereby preventing further fluid communication to the drilling rig fluid system. - Means are provided to return the flow diverterto its normal position after any emergency has been corrected.
Hydraulic line 320 is provided viaport 322 for connection to a source of pressurized hydraulic control fluid to anarea 326 above a shoulder provided in the bottom of thevalve sleeve 256. When hydraulic fluid viaport 304 is removed, application of pressurized hydraulic fluid viaport 322 drivesvalve sleeve 256 downwardly to its normal position.Shoulder 316 in engagement withring 314 forcesannular piston 258 downwardly to its rest or normal position. - A plurality of sealing means are provided to contain either pressurized hydraulic fluid under the
valve sleeve 256 andannular piston 258 or to seal about other openings and holes in the pistons and body walls. For example, sealing means 321 and 322 prevent pressurized hydraulic fluid beneathvalve sleeve 256 from escaping into the interior of the diverter. Likewise, valve sealing means 324 and 326 seal against loss of hydraulic fluid beneathannular piston 258. Sealing means 330 and 332 provide sealing for the upperconical bowl section 310 ofannular piston 258 as it moves upwardly for forcing annular packing element radially inward. Integral seals 340 are provided on thewall 250 of thediverter 222 for sealing thewall 250 of the diverter against the wall of thepermanent housing 224 and also for providing a seal with thevalve sleeve 256 as it moves across theopenings - Turning now to Figure 8 which shows a portion of a cross-section through the line 8-8 shown in Figure 6, means are provided for aligning the
diverter 222 within the permanently mountedhousing 224. As discussed earlier, the diverter is adapted to be lowered by the drilling rig travelling block through the rotary table and into the bore ofhousing 224. Means are provided for aligning thediverter 222 both axially and angularly such that theholes housing 224. Axial alignment is achieved by providing an inwardly facingannular shoulder 350 in thepermanent housing 224 and a complementary outwardly facingshoulder 351. Engagement of thecomplementary shoulders housing 224. - Angular alignment is accomplished by means of an
alignment key 360 extending through thewall 250, thevalve sleeve 256 and theannular piston 258 into engagement withbase 254. Thehead 362 of the key 360 partially extends outwardly from thewall 250 for engagement into anaxial slot 364 provided in a portion of the wall ofhousing 224. The key 360 serves to prevent angular rotation ofvalve sleeve 256 andannular piston 258 thereby insuring that theholes valve sleeve 256 and theholes annular piston 258 do not move out of angular alignment once the diverter is in place within thepermanent housing 224. The outward extension of thehead 362 ofkey 360 fitting within theslot 364 insures that thediverter 222 is aligned angularly with respect tohousing 224 such that thehole 296 in the body wall is in alignment with the vent line means 280 and thehole 298 is in alignment with the flow line means 282.Slot 364 in the housing provides the means by which thehead extension 362 insures the angular alignment. - Slot 365 illustrated in Figure 8A is provided in the key 360 so that drilling fluid within the annular space extending between the
holes base 254 andholes annular piston 258 is not impeded from moving up or down by the key itself, but rather may move freely through the key. As may best be seen again in Figures 2 and 3, thehydraulic fluid ports openings body 250 of thediverter 222 when the alignmentkey head 362 fits withinalignment slot 364 of thepermanent housing 224. Sealing means 380 and 382 provide a seal about thehydraulic fluid opening 370 while seal means 384 and 386 seal about theopening 372 with respect to thepermanent housing 224 wall. Thus, there is provided according to the invention a means by which thediverter 222 is easily aligned both axially and angularly such that passages in the body wall of the diverter are aligned with the vent line and flow line means and with the hydraulic ports for operating the diverter. - Returning again to Figure 6, the position of
key 360 is seen when the diverter is in a normal, not actuated condition. Theslots valve sleeve 256 and second piston orannular piston 258 which allow the sleeve and piston to move with respect to the fixedkey 360. Figure 7 illustrates the position ofkey 360 as thevalve sleeve 256 andannular piston 258 have been moved upwardly during an emergency situation. - Illustrated in Figure 6 is an outwardly extending annular space 400 which is provided to accept a test tool, thereby simulating a test pipe or other object extending through the bore of the housing about which the
annular packing unit 252 may be closed in order to test the operation of the diverter. - Figures 9 through 14 illustrate the
integral seal 340 provided in thewall 250 of thediverter 222. The seal is adapted to be affixed within the wall about theopening 296 or theopening 298 in the body wall. Advantageously, theholes valve sleeve 256 is required to either open or close the hole. On the other hand, the vent line means 280 and the flow line means 282 normally are cylindrical tubular members having a circular opening, thereby requiring that the outlet onthe exterior wall of the diverter be circular in shape. - Thus, an
integral sealing member 340 is provided about the opening in the body wall which is advantageously provided to seal against the permanent housing on the exterior of the diverter wall and against thevalve sleeve 256 movement on the interior of the diverter wall. Preferably, the seal is embodied in a molded or cast member which may be easily manufactured obviating the necessity of machining two unusually shaped holes in each diverter housing which are costly and relatively difficult to machine. Thus, sealingmember 340 is preferably an integral member of elastomeric material and preferably has a support member embedded therein to give it strength. Alternatively, sealingmember 340 may be an integral member fabricated from non-elastomer materials. For example, it may be cast steel, ceramic or a composite material. - Figure 9 illustrates the seal member as viewed from its exterior side showing the
opening 341 on its outside being circular in nature and showing the interioroblong hole 342. Exterior sealing rings 343 are shown for sealing thepermanent housing 342 against the exterior of the body diverter. - Figure 12 shows the sealing element as viewed from the inside of the diverter showing the
interior opening 342 being of oblong shape in which the height of the opening is less than its width. The exteriorcircular opening 341 is also illustrated.Interior sealing ridge 344 is provided for sealing against thevalve sleeve 256 as it either comes into alignment with theopening 342 or seals the opening with an upper part of the sleeve where the vent line means is covered or the lower part of the piston where the flow line means is covered. Sealingshoulder 345 is provided for sealing theseal assembly 340 to thehousing wall 250. - Figure 10 illustrates the shape of the seal element when viewed from its side in which the
oblong opening 342 is shown as well as thecircular opening 341. Advantageously, ametallic support member 390 is provided in theseal element 340 and extends completely about the warped surface defined by the member connecting thecircular opening 341 withtheoblong opening 342. - Figures 13 and 14 illustrate in cross-section how the
support element 390 is preferably disposed within the sealing element itself. - Figures 15A and 15B show a further alternative embodiment of the flow diverter according to the invention. Figure 15A shows the flow diverter in its normal or relaxed state. Figure 15B shows it in the activated or diverting state. Flow diverter 222' is shown within permanently fixed
housing 224 having a flow line means 282 and a vent line means 280 affixed to the housing. The diverter 222' has abody 250 and a base member 254'. Theholes annular packing element 252 in the upper part of the diverter 222'. Holes are provided in the valve sleeve 256' and annular piston 258' similar to that shown in the second embodiment of the invention shown in Figure 6, but alternative sequencing means are provided for insuring that the valve sleeve 256' moves upwardly for closing thehole 298 to the flow line means and opening thehole 296 to the vent line means before the piston 258' is enabled to force theannular packing element 252 about a pipe or other object in the well bore or complete shut off on open hole. - The sequencing means includes means for connecting a source of pressurized hydraulic pressure via
conduit 500 initially solely under the valve sleeve 256'. As the valve sleeve moves upwardly and comes to a final position such that the lower part of valve sleeve 256'covers hole 298 and the hole 284' in the wall of the valve sleeve comes into alignment with the vent line means 280, aport 502 hecomes uncovered, allowing the pressurized hydraulic fluid to be provided under the annular piston 258' thereby driving it upwardly and causingannular packing element 252 to close about a pipe or other object in the well bore or to completely close the annulus of the well bore in the absence of an object in the bore. Acheck valve 503 is provided such that when pressurized hydraulic fluid is provided inconduit 505 in order to force the valve sleeve 256' downwardly, the downward movement of annular piston 258' forces hydraulic fluid- down throughconduit 506 andcheck valve 503 thereby relieving the pressure under annular piston 258'. - Figures 16A and 16B illustrate another alternative embodiment of the diverter according to the invention. Figure 16A shows the diverter in its rest state; Figure 16B shows the diverter in the diverting state with the packing element closing about the bore with no object therein. Again the
diverter 222 is adapted to fit within the bore of a permanently fixedhousing 224 below the rig floor of a drilling rig and above a drilling conduit. Flow line means 282 and vent line means 280 are provided for connection respectively to the drilling fluid system and for conducting pressurized fluid away from the drilling rig during an emergency. As shown in Figure 16A, two pistons are provided by which afirst piston 600 it has two holes provided in its wall. Hole.605 is normally in alignment with the flow line means 282 whilehole 602 is normally below theopening 603 in the wall of thediverter 222. - A
second piston 610 is provided generally above thefirst piston 600 for engagement with thepacking element 222. The means by which the sequencing of the first piston is forced upwardly before thesecond piston 610 is enabled to engage thepacking element 222 is embodied by theupper head 621 of the first piston adapted for engagement with alower shoulder 622 provided generally under thesecond piston 610. As a source of hydraulic pressure viaconduit 620 is applied beneath thefirst piston 600, it is forced generally upward thereby closinghole 601 with a portion of thepiston 600 below a hole in itswall 605.Hole 602 in thefirst piston wall 600 moves upward into alignment with thehole 603 provided opposite the vent line means 280. A point is reached where thehead 621 of thefirst piston 600 comes into engagement with the downward facingshoulder 622 of thesecond piston 610 whereby further upward movement ofpiston 600 is transmitted viapiston 610 toannular packing element 222 forcing it radially inward for closing about a pipe or other object disposed in the bore therein. - Figure 16B illustrates the diverter in the closed position where the packing element has completely closed about the bore of the diverter. The
first piston 600 has moved upwardly such that the flow line means 282 has been closed and the vent line means 280 has been opened. Means for returning the pistons of the diverter to their normal position is provided viaconduit 623 through which a source of pressurized hydraulic control fluid forces thefirst piston 600 back to its normal state.Piston 610 returns to its normal state because of gravity and because the packing element acts to return it to its relaxed state. Thus, as shown in Figure 12A and 12B, a mechanical means is provided for insuring that thepistons - Figure 17A illustrates another embodiment of the
flow diverter 222 in which asingle piston 700 is provided not only for closing theannular packing element 252 about an object in the bore of the diverter but also for closing a flow line means 282 an opening a vent line means 280 during an emergency. Thesingle piston 700 has an upperconical bowl portion 702 adapted for engagement with thepacking element 252 and forcing it radially inward as thepiston 700 moves axially upward. Ahole 710 in the piston wall is normally in alignment with ahole 712 in thebody 250 of thediverter 222. Thesecond hole 713 in the body wall, provided in alignment with the vent line means 280, is covered by thepiston 700 wall when the diverter is in its normal state. When a source of high pressure hydraulic fluid is provided beneath thepiston 700 viaconduit 720,piston 700 is forced upward thereby opening vent line means 280 viahole 713 providing fluid communication with the bore of thehousing 222. Aspiston 700 moves up,hole 712 in the body wall becomes covered by thelower part 725 ofpiston 700, and ultimately,hole 712 becomes completely covered by thelower part 725 of the piston. - Means are provided for insuring that the
packing element 252 does not close about a pipe or other object in the bore hole beforehole 712 is covered andhole 713 is opened by providing aspace 730 above the packing element through which the packing element is free to move axially upward without being forced radially inward as the upperconical portion 702 of thepiston 700 moves up. Thus, a means is provided by which the vent line means 280 is opened and the flow line means 282 is closed from fluid communication with the bore of theflow diverter 222 before theannular packing element 252 is enabled to fully close about a pipe or other object in the bore hole or to completely close the bore of thediverter 222 in the absence of an object in the bore. - Alternatively, as illustrated in Figure 17B, the flow line means 282 may not be provided in the wall of the piston at all, there being provided a flow line means 282' above the diverter through which the flow is normally directed to the fluid system of the drilling rig. For that arrangement, a single passage such as
hole 713 of Figure 13A to the vent line means is provided which is normally covered by thepiston 700. The packing element serves to close all fluid communication to the flow line means, the vent line means serving to divert the flow of pressurized drilling fluid as the piston moves upwardly. - Figure 17C illustrates an alternative embodiment of the diverter illustrated in Figure 17A where
piston 700 is required to move upward before hole 713' provided inbody 250 is opened. - Thus, there has been described various embodiments of a diverter adapted for insertion into a permanently fixed housing connected to a drilling rig. The diverter, in a single apparatus, provides a substantially failsafe means for closing the bore of a drilling concuit to which the diverter is attached and for closing the flow line to the drilling fluid system of the rig and opening a vent line for diverting pressurized drilling fluid away from the drilling rig. Means have been provided to insure that the vent line is opened and the flow line to the shale shaker is closed before the annular packing element closes the annulus of the bore about a pipe or other object in the well. Sealing means by which the holes in the wall of the diverter are sealed interiorly to a piston moving past the hole and exteriorly to the permanent housing are also disclosed.
- The flow diverter according to the invention is failsafe in that it eliminates the need for external valves in the vent line downstream of the connection of the vent line to the permanent housing of the diverter. Such valves, as indicated in the background section above, have been the source of negligence and failure when used with prior diverting systems, causing loss of property and injury to personnel.
Claims (42)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT84900253T ATE50415T1 (en) | 1982-12-13 | 1983-12-12 | FLOW DIVERTER. |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US449376 | 1982-12-13 | ||
US06/449,467 US4456062A (en) | 1982-12-13 | 1982-12-13 | Flow diverter |
US06/449,531 US4456063A (en) | 1982-12-13 | 1982-12-13 | Flow diverter |
US06/449,375 US4444250A (en) | 1982-12-13 | 1982-12-13 | Flow diverter |
US449375 | 1982-12-13 | ||
US06/449,376 US4502534A (en) | 1982-12-13 | 1982-12-13 | Flow diverter |
US449467 | 1982-12-13 | ||
US449531 | 1999-11-29 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0128206A1 EP0128206A1 (en) | 1984-12-19 |
EP0128206B1 true EP0128206B1 (en) | 1990-02-14 |
Family
ID=27503970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84900253A Expired - Lifetime EP0128206B1 (en) | 1982-12-13 | 1983-12-12 | Flow diverter |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0128206B1 (en) |
DE (1) | DE3381219D1 (en) |
GB (1) | GB2141766B (en) |
WO (1) | WO1984002374A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626135A (en) * | 1984-10-22 | 1986-12-02 | Hydril Company | Marine riser well control method and apparatus |
US5012854A (en) * | 1987-03-31 | 1991-05-07 | Baroid Technology, Inc. | Pressure release valve for a subsea blowout preventer |
AU2016304011A1 (en) | 2015-08-05 | 2018-02-01 | Equipment Resources International, Inc. | Diverter for drilling operation |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2021104A (en) * | 1933-08-26 | 1935-11-12 | Leland P Kinnear | Blow-out preventer |
US3222075A (en) * | 1961-08-30 | 1965-12-07 | Shell Oil Co | Underwater blowout preventer |
US3457991A (en) * | 1968-02-16 | 1969-07-29 | Phillip S Sizer | Well tools |
US3614111A (en) * | 1969-10-23 | 1971-10-19 | John Regan | Tool joint stripping stationary blowout preventer with a retrievable packing insert |
US3638721A (en) * | 1969-12-10 | 1972-02-01 | Exxon Production Research Co | Flexible connection for rotating blowout preventer |
US3917008A (en) * | 1974-10-29 | 1975-11-04 | Cities Service Co | Apparatus and process for preventing blow-outs |
US4046191A (en) * | 1975-07-07 | 1977-09-06 | Exxon Production Research Company | Subsea hydraulic choke |
US4063602A (en) * | 1975-08-13 | 1977-12-20 | Exxon Production Research Company | Drilling fluid diverter system |
-
1983
- 1983-12-12 WO PCT/US1983/001936 patent/WO1984002374A1/en active IP Right Grant
- 1983-12-12 DE DE8484900253T patent/DE3381219D1/en not_active Expired - Fee Related
- 1983-12-12 GB GB08419061A patent/GB2141766B/en not_active Expired
- 1983-12-12 EP EP84900253A patent/EP0128206B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
G. Soulie "Têtes de puits sous-marines", Ed. Technip, '78, Paris * |
Also Published As
Publication number | Publication date |
---|---|
WO1984002374A1 (en) | 1984-06-21 |
DE3381219D1 (en) | 1990-03-22 |
GB8419061D0 (en) | 1984-08-30 |
GB2141766B (en) | 1986-03-05 |
EP0128206A1 (en) | 1984-12-19 |
GB2141766A (en) | 1985-01-03 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4502534A (en) | Flow diverter | |
US4444401A (en) | Flow diverter seal with respective oblong and circular openings | |
US4456063A (en) | Flow diverter | |
US4456062A (en) | Flow diverter | |
US4444250A (en) | Flow diverter | |
US4832126A (en) | Diverter system and blowout preventer | |
US4828024A (en) | Diverter system and blowout preventer | |
CA1240921A (en) | Diverter/bop system and method for a bottom supported offshore drilling rig | |
EP0198853B1 (en) | Marine riser well control method and apparatus | |
US4566494A (en) | Vent line system | |
US4546828A (en) | Diverter system and blowout preventer | |
US6109352A (en) | Simplified Xmas tree using sub-sea test tree | |
CA1216515A (en) | Diverter/bop system and method for a bottom supported offshore drilling rig | |
EP2825721B1 (en) | Blowout preventer assembly | |
US8746348B2 (en) | Apparatus, system and method for releasing fluids from a subsea riser | |
US4524832A (en) | Diverter/BOP system and method for a bottom supported offshore drilling rig | |
EP0943781B1 (en) | Sub-sea test tree | |
AU2013204381A1 (en) | Improved Valve Apparatus | |
EP0128206B1 (en) | Flow diverter | |
EP0131618B1 (en) | Vent line system | |
JPS60500064A (en) | Seal of flow diverter | |
AU2015201953A1 (en) | Improved Valve Apparatus | |
JPS60500095A (en) | Diversion device | |
NO165651B (en) | DIVERSION SYSTEM. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
17P | Request for examination filed |
Effective date: 19841119 |
|
17Q | First examination report despatched |
Effective date: 19871104 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AT BE CH DE FR GB LI LU NL SE |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: SE Effective date: 19900214 Ref country code: NL Effective date: 19900214 Ref country code: LI Effective date: 19900214 Ref country code: CH Effective date: 19900214 Ref country code: BE Effective date: 19900214 Ref country code: AT Effective date: 19900214 |
|
REF | Corresponds to: |
Ref document number: 50415 Country of ref document: AT Date of ref document: 19900215 Kind code of ref document: T |
|
REF | Corresponds to: |
Ref document number: 3381219 Country of ref document: DE Date of ref document: 19900322 |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
ET | Fr: translation filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LU Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 19901231 |
|
26N | No opposition filed | ||
REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20020103 Year of fee payment: 19 Ref country code: DE Payment date: 20020103 Year of fee payment: 19 |
|
PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20020104 Year of fee payment: 19 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20021212 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030701 |
|
GBPC | Gb: european patent ceased through non-payment of renewal fee | ||
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES Effective date: 20030901 |
|
REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |