DE2008034C - Well preventer - Google Patents

Description

characterized that a space in "" he second " ^nd J ^cs , £ i cn ufricdin are opposite

Chamber (130) between the locking slide (131) 25 rotatable «-! 1 V ', " ^Z p' _b ,, _{m of the} accumulation

and the housing structure ( 144.145) provided housing ^^^ J ^ ^ _m plug and

and with a rubber-like seal 046. 147) of ™ * ^h ™ ^ * ™ ^ Difficulty, the safety

filled out which is with the axial his Gehaa * · and the bcnwleng,

Housing opening (134) aligned passband heitsven.ilaufbau a comb, "£ ™™" ™™ "

Opening ring-shaped around the passage opening (133) 30 device for narrowing the passage

^e 1 ^r tohr.och _P reventer "oh claim 2, since TeTErfindung Heg. ^^^ Z "™ ^

characterized in that a metallic sealing a borehole preventer a ^ omehtung to Ve,

ring (150, 151) a part of the passage opening constriction of the passage »m Bohrlocn rmt uncm

(13 ^g 3 forms in the vicinity of the locking slide (131) . ₃₅ Safety valve assembly η ["™ J ^ J ™ \ ™

tight contact metal-to-metal with the blocking combine that the ^ob ^ _r ^a _H ⁿ " ^ien _We :

slide (131) and in engagement with the difficulty w «the we.

rubber-like seal (146, 147) . improved sealing construction for em

^g 4. Borehole preventer according to claim:. 2 vent.l with! «« Transferring

or 3, with an operating device to the side of the 40, which is the V ™ y

Borehole head, which seals via a rotatable ^{shaft, and still ei} " ^e ^^^^ f ^ _n

the locking slide is connected, thereby the locking slide is possible ^m ^ ¹ _r "" f. _r housing parts

indicates that for sealing against the after dismantling dr GJh auseterie

Wellhead an annular seal (160, between which it also seals, replaces

161) remains arranged 45 around the shaft (136, 135). HohrlodiDreventer

is and that another seal (162) of the ring- This task is done with T ™ ^B _p ™ ^

shaped seal (160, 161) is adjacent. that of the initially described "flat A · ^erfi " J "" ^ ^m ^ ° between the upper and lower parts of the solved by that the »

and which is arranged in a further chamber of the Ge, the lower part of which can be removed from the housing is.

The invention relates to a Bohiloch- 55 Accordingly, the gate valve can easily enteventer, the housing of which has axially aligned openings to replace the seal structure, η for carrying out borehole tools on- The borehole preventer is expediently with one in a chamber of the housing stating that a space was closed in the second chamber, radially movable packer ring, which is to see the gate valve and the housing structure e axial opening is arranged and provided by a ver 60 and with a rubber-like seal cal adjustable, is filled with an inclined surface, which is located with the axial money hydraulically operated piston is moved, so the housing seal is aligned with the port opening extends below the packer ring with an additional shape around the passage opening, bsperrorgan with axial passage opening. This prevents sand and other particles

Through the German patent specification 1 217 305 a 63 penetrates this space and the rotation of the : a type of borehole preventer, especially a sol gate valve. This is very important in ier with vertically arranged, interconnected with regard to undersea drilling work, in which : nen chambers, a narrowable packer ring in which reliability is a critical point.

A metallic sealing ring can also be provided be, which forms part of the passage opening in the vicinity of the gate valve, tight metal-to-metal contact with the gate valve and is in engagement with the rubber-like seal; being the ring serves to prevent the rubber-like seal from shifting out of its space as a result of pressure limited ..

Finally, the well preventer can with an operating device on the side of the wellhead, which is connected via a rotatable shaft to the gate valve, be constructed so that for sealing against the wellhead an annular seal is angeorunet around the shaft and that a further seal is adjacent to the annular seal, which is between the upper and lower parts the ummi-like seal runs around the gate valve.

Embodiments of the invention are shown in the drawing and will be described in more detail below described. It shows

Fig.: A side sectional view of an embodiment the invention,

F i g. Figure 2 is a side sectional view taken along line 2-2 in Fig. 1.

F i g. 3 is a perspective view of the locking slide in Fig. 1 and 2, the sealing ring assembly on the bearing bushes of the journal of the slide is attached.

F i g. 4 is a front view of the arrangement according to FIG. 3 from line 4-4 in FIG. 3,

F i κ. 5 is a plan view of the arrangement according to FIG Fig. 3 from line 5-5 in Fig. 3. 3,

Fi g. fi - a perspective view of the sealing ring assembly,

F i g. 7 is a side view of a well preventer according to the invention incorporated in a subsea wellhead assembly, and

F i g. 8 is a side sectional view of a modified seal arrangement of the gate valve.

In Fig. 1, a wellhead 10 has a body 11 with concentric bores 12, 13 and 14, which have progressively increasing diameters. A cap 16 is releasable on the body by a comb-shaped connection 17 held in such a position that the surface 19 of a cap flange 20 is in contact with the upper end 21 of the body 11, the cap and body with a seal 22 are sealed. The cap 16 has a bore 23, which has the same diameter as the bore 12 drs body and is concentric to this. There are bolt holes in the top surface of the cap 16 24 lowered for the attachment of the drill head equipment above. An annular one Groove 25 in the upper surface can be one. Sealing ring for sealing against the mentioned equipment take up.

The body 11 has a mounting flange 27, through which bolts 28 in connection a flange 29 of the lower body part 30 is made, in which the bore 12 is located.

The cap 16 has an inner annular flange 35, further down the line Bore 23 results, and a peripheral flange 36 which surrounds a bore 37 which is concentric to all of the named holes in the body.

The body ll has an annular upward standing flange 38, which has a pack actuating part 39 at point 40 to limit the downward movement of this part. The actuation part 39 has a piston part 41 with a piston seat in the bore 14 and a piston sleeve 42 with a piston seat in the bore 13. The actuating part has an extension 43 upwards, with a piston seat in the Bore 37. Sealing rings 44, 45 and 46 are between the piston parts 42, 41 and 43 and the corresponding Walls are provided which accommodate these parts and so form the cylinders.

The piston part 41 divides the bore 14 into upper (first) and lower (second) cylinders or pressure chambers 47 and 48, with openings 49 and 50, respectively, in these chambers. Outer tubes 51 and 52 open in the openings 49 and 50. For the purpose of compensation, the outer diameters of the chambers 47 and 48 and the inner diameters and chambers the same.

The actuating part 39 has a conical body 53 running downwards, and the continuation 43, which surrounds this bore, can roughly be viewed as an inner conical wedge or as a packing constriction element. The pack P reveals a mushen ring or sleeve 55 made of plastic

S5 fabric and preferably made of flexible material like rubber or synthetic rubber. In most cases, a single pack is designed for repeated opening and closing Shooting processes are provided, and this is done therefore preferably relatively good suspension properties have so that it can return itself to the open position when the constricting Force is removed. From this point of the description it should be assumed that the package has such suspension properties. It has been shown that rubber with a durometer hardness of about 75 is suitable for general use in wraps. The pack is as unslit, continuous ring shown, but does not necessarily have to be designed as a pack in which no Slot is. as long as there is no angled gap that interrupts the continuity of the packing, when it is radially contracted into sealing connection with parts arranged in its bore is.

In the structure of the pack is a series of solid elements 56 for controlling the flow of rubber included, which with the rubber in its radial contraction and expansion movement and are also movable to a limited extent with respect to the rubber alone, as will be shown later will be. Taken together, the solid controls can be both radially expandable and contractible Reinforcement are considered, which are embedded in the ring 55 and connected to it

SS are.

The shaped ring 55 has an outer conical surface 57 which is complementary to the bore 53 of the actuating part, and a bore 58 with a central, substantially cylindrical part 58 and oppositely inclined upper and lower parts 60 and f \, respectively, in each case are expanded to the outer ends of the ring.

Each element 56 includes upper and lower plates 63 and 64 which are fixed by vertical ribs 65 are connected, the outer surfaces 67 have the conical shape shown. The plates 63 and 64 can be viewed as transverse flanges on the ribs 65. The elements 56, evade

or one

other suitable fixed see that the arrangement and the mode of operation also

r4T

the rubber

be sought, in which they by fastening * -

^ nertn

^ J _the

,! ktlndefPlatten both at the top and around the actuating part at least partially in one ίϊ OccurrenceThe pates are ^ o shaped so that the »state of equilibrium opposite to the downward occur. The had s «παι. t, ^ to push the applied force upwards.

d ^ ^z we «r benacnDar g hydropneumatic ^ battery

in ti gy ^ P ^ _{tubes fij and}

^^ _Print , "" _{and a}

Four-way valve 92 is in communication. In a Stcllung of the latter is the Rohr _train 51 Hydraulic fluid * and performs printing liquid in the tube 52 at point discharged into the sea 93rd In the other position of the valve 92, pressure fluid is fed to the pipe 52

^ _{supplied and} ejected liquid from the pipe 51 into the sea. A suitable electric prime mover 94 controls the valve 92 and a suitable controller 95 for the pressure regulator can be operated from the top to the tubes 51 and 52

_{a5 to} set the pressure applied. Similarly, the _Ro ^g _{hr84 can} have a regulator 96 and a four-way valve

^ will. Controls for the ^^ ^ ^ ^^ ^ ^ ^ ^ _{gg denoted}

. ^ - ^ - "" - ö ,, _{of the} surface are electrically operated, _bewirkcn to selected pressure supply to the chamber ^B _where a cable to the surface with _{beze | is cnnet The} steuerung98 for the regulator ^ can through a pipe 110 with a, Ring or

p ^^^ StcRung of passage 85 connected to mud pressure

required. In order to be able to address J ^ Abwart ° ^e " ^c S ^u Jf." _{In the vicinity of the} packing and effectively limit R.ngcs, em A ^ns cmag chamber 82 is a

lTTfr ^e :? rS ^eh D ⁿ ; ^ ΐ pi of the rungs of the flushing pressure to the regulated pressure

to lead. _submarine borehole preventer

assembly 100 which includes a series of blowout valves 101. A conveyor system 102 is arranged above the arrangement 100 and connected to it via _a tj _{bcrganRSSpiece} 103. The conveying pipe ^& _{rsUeckt to the} sea surface and usually ^, _{'to dnem drilling ship 104} or other Einrichn assembly 100 and the conveying system 102

sin _d ^g only illustrious and can use the pressure ^ ^ _Akkl 90 i di höri

en occur

Between the opposing nth elements there is a distance from one another, from which it follows that there is a movement, a hemisphere, hal inwardly, a distance
decrease moderately in width
mutual interference of the JJ ¹ " ^th " ends occurs, and the gum * narrowing of the ring ^ "JX ^ can, at the radially inner ends of the plates, is pinched away

_f .. ^D S ^{r Rl} "ß f * f ^ f _u J ™ diäus« n ^ ÖbeSächen shaped part 72 radially over the ι ™ ^ ^η ^ ™

the plate protrudes - ^oraus /

do not see surfaces with ^d ^

53 of the actuating part * ^

Purposes of the later description g

Shaped part 72 considered as the te_il_ ^ weicncr s. ^

from the conical surface sv to aen auoc.c. . .—

of ribs 65 extends. _{nmmrnrr Karmc} i6 in

. The package w.rd be, _abgenommener K _APPC e ^ _n the situation corresponding to Figure 1 abgcsenkt, wotun de ring 55 smoothly into the upper ^ ^{e> de;} ™ ^ ^ fits without a ^^^ disruption of the would be necessary. To J ^ Waiting ° ^e » ^c S ^u Jf b

of

Receipt g

BoliTunTf5 rG: h? UsrSDa; ^

Tube represents ^ n packing stop The drilling

tion 75 of this pipe *. has the »^^ J ™ ^

like holes 12 and 23 and

an annular ^^. ^^

42 as well as the lower end of the

Movement 43 of the youngest, ls on.

75 open openings, 76 .η em ■

which annular through ^ s tube 74 and

80 limited ^ J "^" ^^^ SHÜte sin _d only illustraüv dfrgestcllt and can the r wall 78 of the body and the lower tnae oei η ^^ ^ _{n accumulator} 90 «, like the associated

^ All ^ dleKappe 16 then put in place, the above-mentioned pipelines and controls

is strengthens their BUDET - ^ ä ^ CIS ^ ° ^ St lower chamber 130 includes in the body 11 an abutment 79, the A ^u ™ ^art turned supply locking slide 131, which for rotatably about

^^^ £ ^^ Γ a horizontal axis 132 is arranged. One

^ Rotation brings the passage opening 133 in the

Hictas79 the 55 slide in and out of correspondence with ad axial housing opening 134. In view of this, the lower body part 30 of the body or housing is by _removing ^H _{g of the} ρ, ^^ _{29 from the} fastening-

flange 27 of the housing after removing the bolts ^ _{abpehmb creating a direct z mm}

Lock slide is created and removed

"^ t slide is rotatable by shaft ,, or

^ JSPESSLS ^ these journals 135 and 136 are held, which are arranged on _{opposite sides by holding the pack against 6 5} opposite sides and with the axis 132 in relation to the body and right, rings, such as I.ager- KtlÄb w * «d, l in bTzHg on bushes 137 and 138 sit on the axle journals and and the packing takes place, it is understood that they are arranged in bores t \ 9 and .40, whose

elements 56 about this

Package «" »« Ι «« »β ¹ ^

upper end of £ ° ^h ' ^cs ™

Cap thus form

Notice which, j £

^W T ⁿ S ί ™ ?? 2k ™ J is Ξ. Dk P ^ kung P is: so in

^ SÄ ^ S Narrow the

Loading

Pack through

this

upper halves extend through the lower body part 30, shown in Fig. 5, to form a layer will. Appropriate after the removal are to be allowed. The parts 162 are between the tion of the latter the bearing bushes and journal flanges 27 and 29 of the body held or mit the locking plug can be removed downwards in order to jam in order to create a seal between them. ! iiand to be set or replaced. This can be achieved, as shown in FIG. 4 can be seen. follow while the flange 141 of the body part 30 in the removal of the slide, the stub axle

with the borehole head below it and the bearing bushings as described above is raised. the unitary rubber-like seal 160, 161 and

The space between the locking slide and the 162 has also been removed and can then, if necessary, inner wall parts 144 and 145 of the body must be replaced with io. By forming the seal on one rubber-like seal, which consists of 160, 161 and 162 as a unit, does not exist extends annularly around the passage opening 133. Possibility for drilling fluid to the outside or if the latter is in the position as in Fig. 1 in out for sea water inward past unconnected direction with the opening 134 is. Such seals penetrate parts of the built-in seal, and can typically consist of upper and lower hemispheres 15 this helps to make this housing construction possible 146 and 147 are made of hard rubber, which make it Hch and practical, through which of the along a horizontal plane through the locking slide axis and the hemispherical shells 146 and 147 132 are connected to each other. These half can be removed and replaced as described, Ball cups, as seen, extend tightly around Finally is on one side of the housing structure

the inner annular ends 148 of the non-rotatable 20 operating means are provided to allow rotation Bearing bushes 137 and 138, which are transferred to the gate valve with hung. The last cm Slide are in communication and this in tere contains a pinion 170, which with a wedge center the housing chamber. O-rings 149 form 171 with an extension 172 of the journal 135, such as a seal between these ends and the axle seen in Figs. 1 and 2 is keyed. The pinion 170 tap. The same hemispherical shells 146 and 147 as is carried in a housing 173 which is attached to the made of rubber prevent the ingress of sand and spot 215 with body part 30 and body 11 Foreign bodies in the space between the slide and so bolted that it is from this with the slide Body during the operation of the hole and can be removed.

thus close a cause of possible misalignments In the housing 173 there are upper and lower toothed racks

instructions of the locking slide. 30 gen 175 and 176 arranged, which with the pinion

Metallic sealing rings 150 and 151 are seated on which are in engagement and are connected to pistons 177 and 178 inte-hemispherical shells made of rubber and slidingly connected in Bohgral. The latter are in the housings 152 and 153 of the body and form parts of the structure formed as shown cylinders 179 and 180 134 "and 134 /) of the opening 134 in the vicinity of the reciprocating, the cylinders on their locking slide 131. These rings have closed heads at the positions 35 with end caps 181 and 182 lcn 154 and 155 seal with the slide surface. When fluid pressure is supplied to make the metal-to-metal contact and serve to push the piston 177 to the left in Fig. 2, the rubber-like material of the hemispherical shells 146 and the pinion is rotated 147 by the rack 175 against displacement out of space between and drives the toothed rack 176 and the piston 178 to limit the slide and chamber wall to the right by pressure, with liquid from the space between. in particular when the slide opening is rotated out of alignment with the piston 178 and the end cap 182 out of alignment with the opening 134. is bumped. The end caps 181 and 182 begren-Dcn end faces 156 and 157 of the sealing rings is the _ze n, the rotation of the locking slide to a win-fluid pressure in the bore supplied to the angle range of about 90 °, together with end rings in contact with the slide surface to 45 hold caps 181 α and 182 «at opposite ends. The piston. Rollers 220 and 221 catch a sideways

In another aspect of the invention, the load on the piston by the pinion 170 has to be borne by this. do that the sealing ring assembly has a part or TeMe of the vessel or accumulator 90 is pressure changes, which are located between the bearing bushes or lathes to openings 190 and 191 under control Bushings extend to allow a seal between a four-way valve 192 to be fed. One electric the latter and the bores 139 and 140 in the fed-in valve drive are denoted by 195. To reach the body or housing, and a white control lines 196 lead over the cable 199 and the part that is non-sealing around the stopper from this valve drive to the surface, extends to allow rotation of the plug. Referring to FIG. 8 is the construction of a

while the ring part against the body and in particular locking slide arrangement similar to the structure in particular between opposing body surfaces F i g. 1. Corresponding parts are denoted by the axis 132 numeral with the same near the horizontal plane. The modified rubber type seals. In this regard, Figures 3 to 6 show seals 146a and 147a are the same and we have O-ring portions 160 and 161 of the seal which are again remote from one another and sized to block the ingress of sand, 60 or other foreign objects in the space between that they fit around the sleeve ends 148 and themselves in the slide and body. In this case the upright planes have to extend. The O-ring seals annular ends 146 & and 1476, which further includes parts 162 which connect the O-ring parts before each other and around the gate at 160 and 161 and in a plane perpendicular to an angle relative to the axis 210 of the passage to the Planes of the O-ring parts 160 and 161 extend together: the arrangement is characterized by the horizontal plane through which the passage opening 133 of the slide lies directly on the axis 132. The parts 162 are the same and so only exposed to the ends. if this ncmcsscn that they cattle with play to the slide, like opening out of alignment with the opening 134 g _C -

turns is. As a result, the pressure of the liquid in the opening 134 does not gain direct access the gap or play 211 between these ends, which access otherwise leads to a displacement after inside as a result of the pressure occurring at these ends in the slide opening and consequently to its excessive Wear could result if the slide edge 212 in its during slide rotation open position is guided in the direction of arrow 213 over the column 211. As shown, crossed this following edge joins gap 211 just after or at the same time as leading edge 214 of FIG opening 133 the sealing ring 51 and comes into contact with the opening 134. The angle between the plane of the gap 211 and the axis 210 is

ίο

denoted by X This plane further reveals the transverse axis 132 of the slide movement, as shown in FIG. H becomes clear.

Furthermore, retaining devices are provided which extend into the modified hemispherical seals 146a and 147 ο and hold back the annular ends 146 b and 147 δ against displacement inwards in the direction of the slide when the slide opening crosses these ends. In the example shown, these holding devices consist of metal inserts 215 and 216, which extend into the ends or are embedded in them and are arranged around the slide, with insert parts 215a and 216a which enclose the axle journals 135 and 13i and the bearing bushes 137 and 138.

For this purpose 2 sheets of drawings

Claims (1)

Has borehole tools, with ejncm in a ^s P ^e _D ^rr ° ^r f ^{a [} ? '""' _{know the} equipment Chamber of the housing mounted radially sawn ^B ° ^hrloch r TnfTrtbei which aas well bore moveable packer ring around the axial opening are in the one ^; _Device like an in is arranged and closed by a vertically adjustable Vci ^ gung around a _Bohrkolotme Baren, provided with an inclined surface and io the borehole ungenm _which the entire hydraulically operated piston is moved, as well as is or in ^dte ^ _ührlo ' _ch completely closed below the packer ring with an additional through-hole voη uc u the _latter equipment Shut-off element with an axial passage opening, there is. ^Beis P ^iel * ¹ ^. _SDerrs t _O pfenventile. In many characterized thatdawu- ^^ f ^ "desires be de types of equipment Additional shut-off device from a gate valve 15 traps ^{it is} £ ™ * ^ in a borehole- (131) consists, the axial passage opening gene to increase the Sichurn _{a om} . (133) rotatable around the horizon as an axis head closed, ver ^ nuv M »haU _final . (132) bi, to block the axial housing, that the ">& ¹ ^ Oueilenbohrungen with opening (134) is adjustable and that in one direction for boreholes r" η ^ _Bohrlo ^B _chkop ,