The cutting edges 76 and 96 first contact the pipe 15 at contact points A, as shown in FIG. The cutting edges work cooperatively to completely shear the pipe 15 by the time the face of the shear blade 62 reaches the face of the ram block 34 and the face of the shear blade 88 reaches the face see FIG. A blowout preventer of the character defined in claim 4, wherein the side seal parts on one ram have front faces abutable with those of the other ram to de form said seal means and seal member into sealing engagement during movement of said rams to their inner positions. Handbook of Texas Online. This invention relates to an improvement in variable bore ram packers for a ram-type blowout preventer used in oil and gas drilling operations.
|Date Added:||13 November 2017|
|File Size:||70.54 Mb|
|Operating Systems:||Windows NT/2000/XP/2003/2003/7/8/10 MacOS 10/X|
|Price:||Free* [*Free Regsitration Required]|
As illustrated, each ram body has flanges which extend from its inner end to provide surfaces which face famtype to surfaces on said body on opposite sides of the outwardly extending surfaces on the body, and said seal means comprise side seal parts disposed between said oppositely facing surfaces on the body to engage on their sides with the guideways and with opposite ends of ramtypw seal member carried by one of the ram bodies.
The dual ram blowout preventer has a body with a bore running therethrough. It is therefore an object of this invention to overcome that problem by providing a blowout preventer of this type in which the rams will seal with respect to one another, and thus permit the bore 20011 the preventer to be closed off, even though such junk may be disposed between them.
A blowout preventer of the character defined in claim 1, wherein said seal means includes faces abuttable with one another to deform said seal means and seal member into sealing engagement, during movement of said rams to their inner positions.
However, as will be apparent from FIGS.
Ram valves / Piston valves : Ram type drain valve
The blowout preventer is a T-shaped coupling that is screwed onto the top of the casing. The annular ring-shaped region between the casing and the drill stem is filled with drilling mud which provides hydrostatic pressure to keep the formation fluid from coming up the wellbore.
However, it should be clear that the ram blocks 32 and 34 may be suitably sized to fit into any standard cavity in a blowout preventer.
As well known in the art, a ram-type blowout preventer comprises a housing having a bore through it and adapted to be connected to a wellhead in alignment with the well bore.
Types of RAM: How to Identify and their Specifications - Technibble
The portions of the seal members and on the top surfaces and seal against seal seats and shown in FIG. The cutting edges 78 and 98 engage the ovaled pipe at contact points B and start to slice and shear the pipe.
In an effort to minimize the tearing and loss of mass of the elastomeric sealing element, numerous modifications and additions to the ram packer and particularly the elastomeric sealing element in ram-type blowout preventers have been used.
A ram-type blowout preventer has a bore that may be aligned with the well and a pair of opposed rams that may be actuated to engage each other and close off the bore. As best seen in FIG. More particularly, these downwardly facing surfaces on flanges 24A are spaced above the upwardly facing surfaces of the flange 20A a distance approximately twice the thickness of the blade 19A so as to permit a blade of the same thickness on the left-hand ram to be moved into the space between the top of blade 19A and the flanges 24A, as will be described below.
As the piston 38 moves to the right, fluid is exhausted from the chamber Flanges 24B are spaced below the surfaces of flange 20B a distance approximately twice the thickness of plate so as to permit blade 19A to be moved into the space between blade 19B and flanges 24B, as blade 19B simultaneously moves into the space between blade 19A and flanges 24A of ram 13A.
The blowout preventer 10 includes an upper carrier ram block 32 and a lower carrier ram block 34 which are positioned in the ram cavities 23 and 26respectively. Magnetic particle inspection of the rams and shear blades after all testing showed no cracks.
The ram blocks 32 and 34 have been tested on the pipes and casings described in FIGS. These operators include reciprocating hydraulic actuators releasably connected to the outer ends of the rams, as by means of T slots, as well known in the art. The actuator 28 includes a cylinder 36 which slidably receives a piston ratype The use of metal inserts in a conical-type blowout preventer is disclosed in U. As best shown in FlG.
ShieldSquare reCAPTCHA Page
These valves are preferred to Disc type flush bottom valves when full flow is required. Apparatus of the character defined in claim 6, wherein said seal means includes front faces on one ram abuttable with those on the other to defonn said seal means into sealing engagement during movement of said rams to their inner positions.
Then, the cutting edges 78 and 98 may contact the pipe and present a slice and shear action on the pipe, much like a knife cutting a tube. A ram-type blowout preventer used in oil and gas drilling operations having a variable bore ram assembly according to claim 11wherein: Ram 28 includes top seal 44 on its upper face.
Top seal part 29A is curved so as to form substantially a continuation of the top and sides of the ram carrier 18A.
More particularly, the shear blades are of such length end-for-end that, when moved to their inner positions, they will overlap for a considerable axial distance, so as to dispose a seal member 42 carried on and extending across surface 23B of blade 19B opposite the upwardly facing surface 23A of blade 19A, and at the same time leave a substantial space between the inner end of each ram and the vertical wall of the other ram to receive the cut ends of the pipe.
Thus, flange extends inwardly from the top of carrier to provide a downwardly facing flat surface to which the top side of blade 19B is secured by bolts which extend through aligned holes in flange 20B and top side of plate The lower end of the housing is adapted to be connected to a wellhead in axial alignment with the bore of an underwater well, which may be disposed a substantial distance beneath the water level.
Cameron ram-type blowout preventer
The device had a lateral valve below the rams on its bottom section. That is, as will be apparent from FIGS. The shear blade is similar to the shear blade 88shown in FIGS.
Apparatus of the character defined in claim 7, wherein said seal means includes rigid parts on their inner sides past which the body of the other ram moves following abutment of the faces of said seal means.