CA3111310A1 - Rotating control device seal - Google Patents
Rotating control device seal Download PDFInfo
- Publication number
- CA3111310A1 CA3111310A1 CA3111310A CA3111310A CA3111310A1 CA 3111310 A1 CA3111310 A1 CA 3111310A1 CA 3111310 A CA3111310 A CA 3111310A CA 3111310 A CA3111310 A CA 3111310A CA 3111310 A1 CA3111310 A1 CA 3111310A1
- Authority
- CA
- Canada
- Prior art keywords
- ram block
- rotating control
- control apparatus
- inner member
- ram
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 66
- 238000003780 insertion Methods 0.000 claims abstract description 7
- 230000037431 insertion Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000005012 migration Effects 0.000 claims description 2
- 238000013508 migration Methods 0.000 claims description 2
- 238000005553 drilling Methods 0.000 description 16
- 241000282472 Canis lupus familiaris Species 0.000 description 12
- 239000012530 fluid Substances 0.000 description 12
- 238000002070 Raman circular dichroism spectroscopy Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 230000003993 interaction Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000004941 influx Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/08—Wipers; Oil savers
- E21B33/085—Rotatable packing means, e.g. rotating blow-out preventers
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sealing Devices (AREA)
Abstract
. A rotating control apparatus, comprising:
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
- a bottom surface adapted for connection with a mud cross;
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
- a bottom surface adapted for connection with a mud cross;
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
Description
ROTATING CONTROL DEVICE SEAL
FIELD OF THE INVENTION
The present invention relates to a rotating control device seal for use in the oil and gas industry, more specifically used in managed pressure drilling operations.
BACKGROUND OF THE INVENTION
When drilling for oil and gas, one encounters geological formations that have a narrower tolerance for changes in bottom hole pressure. Constant improvements are being sought to reduce any downtime of equipment and expedite any repairs that become necessary. A widely adopted solution to this problem is the so called 'Managed Pressure Drilling' (MPD). In this method of drilling, the annular space is closed to the atmosphere by means of a Rotating Control Device (RCD). Rotating equipment requires maintenance as the drilling environment produces forces, elevated temperatures and abrasive cuttings detrimental to the longevity of seals, bearings, and packing elements. An RCD is a pressure-control device used during drilling for the purpose of making a seal around the drillstring during its rotation and/or tripping in and out of a well. The RCD is designed to contain or divert hydrocarbons or other wellbore fluids and pressure and prevent their release to the atmosphere. The RCD diverts the fluid into a manifold equipped with a specialized choke that allows manipulation of the well's bottom hole pressure.
Right before breaking a connection to add a new stand, the pumps are ramped down. At the same time, the dynamic component of the bottom hole pressure drops and needs to be compensated for, in order to maintain a near-constant bottom hole pressure.
In the oil and gas industry, it is paramount to ensure the safety of employees, a problem that may jeopardize employees' safety on a drilling rig is known as a "blowout". When a zone of high geopressure is encountered during a drilling operation and the pressure exceeds the hydrostatic pressure exerted by the drilling mud, and the formation has sufficient permeability to allow fluid flow, then the formation fluid will move into the wellbore and displace the drilling mud. This is referred to as a "kick"; and if unchecked it will result in a "blowout" which is an uncontrolled release of crude oil and/or natural gas from an oil well Through the use of an MPD system which includes an RCD a kick can be safely controlled.
During drilling operations, the drill pipe or tubular is axially and slidably moved through the rotating control head. The axial movement of the drill pipe along with other forces experienced in the drilling operation, some of which are discussed below, causes wear and tear on the bearing and seal assembly and the assembly subsequently requires repair. Typically, the drill pipe or a portion thereof is pulled from the well and the bearing and seal assembly in the rotating control head is then released.
Date Recue/Date Received 2021-03-05 The internal sealing elements may be either passive or active. Passive sealing elements, such as stripper rubber sealing elements, can be fabricated with a desired stretch-fit. On the other hand, an active sealing element typically requires a remote-to-the-tool source of hydraulic or other energy to open or close the sealing element around the outside diameter of the tubular. An active sealing element can be deactivated to reduce or eliminate the sealing forces of the sealing element with the tubular. Several types of RCDs have been proposed with combinations of active and passive seals or sealing element, usually combining a stripper rubber sealing element and an active sealing element.
A tubular typically comprises sections with varying outer surface diameters.
The passive and active sealing elements mentioned above must be designed to adapt to seal around all of the rough and irregular surfaces of the components of the tubular, drill pipe, tool joints, and drill collars.
The continuous movement of the tubular through the sealing element while the sealing element is under pressure causes wear of the interior sealing surface of the sealing element. When drilling with a dual annular sealing element RCD, the lower of the two sealing elements is typically exposed to the majority of the pressurized fluid and cuttings returning from the wellbore, which communicate with the lower surface of the lower sealing element body. The upper sealing element is exposed to the fluid that is not blocked by the lower sealing element. When the lower sealing element blocks all of the pressurized fluid, the lower sealing element is exposed to a significant pressure differential across its body since its upper surface is essentially at atmospheric pressure when used on land or atop a riser. The highest demand on the RCD
sealing elements occurs when tripping the tubular out of the wellbore under high pressure.
Several components are used to control the fluid pressure. Typically, one or more blowout preventers (BOP) are mounted with the well forming a BOP stack to seal the well. In particular, an annular BOP is used to selectively seal the lower portions of the well from a tubular that allows the discharge of mud. In many instances, a conventional rotating control head is mounted above the BOP stack. An inner portion or member of the conventional rotating control head is designed to seal and rotate with the drill pipe. The inner portion or member typically includes at least one internal sealing element mounted with a plurality of bearings in the rotating control head.
The thrust generated by the wellbore fluid pressure, the radial forces on the bearing assembly and other forces cause a substantial amount of heat to build in the conventional rotating control head. The heat causes the seals and bearings to wear and subsequently require repair. The conventional rotating control
FIELD OF THE INVENTION
The present invention relates to a rotating control device seal for use in the oil and gas industry, more specifically used in managed pressure drilling operations.
BACKGROUND OF THE INVENTION
When drilling for oil and gas, one encounters geological formations that have a narrower tolerance for changes in bottom hole pressure. Constant improvements are being sought to reduce any downtime of equipment and expedite any repairs that become necessary. A widely adopted solution to this problem is the so called 'Managed Pressure Drilling' (MPD). In this method of drilling, the annular space is closed to the atmosphere by means of a Rotating Control Device (RCD). Rotating equipment requires maintenance as the drilling environment produces forces, elevated temperatures and abrasive cuttings detrimental to the longevity of seals, bearings, and packing elements. An RCD is a pressure-control device used during drilling for the purpose of making a seal around the drillstring during its rotation and/or tripping in and out of a well. The RCD is designed to contain or divert hydrocarbons or other wellbore fluids and pressure and prevent their release to the atmosphere. The RCD diverts the fluid into a manifold equipped with a specialized choke that allows manipulation of the well's bottom hole pressure.
Right before breaking a connection to add a new stand, the pumps are ramped down. At the same time, the dynamic component of the bottom hole pressure drops and needs to be compensated for, in order to maintain a near-constant bottom hole pressure.
In the oil and gas industry, it is paramount to ensure the safety of employees, a problem that may jeopardize employees' safety on a drilling rig is known as a "blowout". When a zone of high geopressure is encountered during a drilling operation and the pressure exceeds the hydrostatic pressure exerted by the drilling mud, and the formation has sufficient permeability to allow fluid flow, then the formation fluid will move into the wellbore and displace the drilling mud. This is referred to as a "kick"; and if unchecked it will result in a "blowout" which is an uncontrolled release of crude oil and/or natural gas from an oil well Through the use of an MPD system which includes an RCD a kick can be safely controlled.
During drilling operations, the drill pipe or tubular is axially and slidably moved through the rotating control head. The axial movement of the drill pipe along with other forces experienced in the drilling operation, some of which are discussed below, causes wear and tear on the bearing and seal assembly and the assembly subsequently requires repair. Typically, the drill pipe or a portion thereof is pulled from the well and the bearing and seal assembly in the rotating control head is then released.
Date Recue/Date Received 2021-03-05 The internal sealing elements may be either passive or active. Passive sealing elements, such as stripper rubber sealing elements, can be fabricated with a desired stretch-fit. On the other hand, an active sealing element typically requires a remote-to-the-tool source of hydraulic or other energy to open or close the sealing element around the outside diameter of the tubular. An active sealing element can be deactivated to reduce or eliminate the sealing forces of the sealing element with the tubular. Several types of RCDs have been proposed with combinations of active and passive seals or sealing element, usually combining a stripper rubber sealing element and an active sealing element.
A tubular typically comprises sections with varying outer surface diameters.
The passive and active sealing elements mentioned above must be designed to adapt to seal around all of the rough and irregular surfaces of the components of the tubular, drill pipe, tool joints, and drill collars.
The continuous movement of the tubular through the sealing element while the sealing element is under pressure causes wear of the interior sealing surface of the sealing element. When drilling with a dual annular sealing element RCD, the lower of the two sealing elements is typically exposed to the majority of the pressurized fluid and cuttings returning from the wellbore, which communicate with the lower surface of the lower sealing element body. The upper sealing element is exposed to the fluid that is not blocked by the lower sealing element. When the lower sealing element blocks all of the pressurized fluid, the lower sealing element is exposed to a significant pressure differential across its body since its upper surface is essentially at atmospheric pressure when used on land or atop a riser. The highest demand on the RCD
sealing elements occurs when tripping the tubular out of the wellbore under high pressure.
Several components are used to control the fluid pressure. Typically, one or more blowout preventers (BOP) are mounted with the well forming a BOP stack to seal the well. In particular, an annular BOP is used to selectively seal the lower portions of the well from a tubular that allows the discharge of mud. In many instances, a conventional rotating control head is mounted above the BOP stack. An inner portion or member of the conventional rotating control head is designed to seal and rotate with the drill pipe. The inner portion or member typically includes at least one internal sealing element mounted with a plurality of bearings in the rotating control head.
The thrust generated by the wellbore fluid pressure, the radial forces on the bearing assembly and other forces cause a substantial amount of heat to build in the conventional rotating control head. The heat causes the seals and bearings to wear and subsequently require repair. The conventional rotating control
2 Date Recue/Date Received 2021-03-05 head typically includes a cooling system that circulates fluid through the seals and bearings to remove the heat.
EP patent application 2 995 712 A2 teaches a rotating control apparatus, comprising: an outer member; an inner member having a first sealing element and a second sealing element; said inner member, said first sealing element and said second sealing element rotatable relative to said outer member; a first cavity defined by said inner member, said first sealing element and said second sealing element; and said inner member having a port to said first cavity. The first sealing element being inflatable to adopt the configuration of the drill string during operations and deflatable to allow the drill string to pass through the RCD when tripping in or out of the wellbore.
Despite the existing prior art, there still exists a need for a robust seal for RCD which when in operation allows to increase the longevity of passive seals and therefore reduce the number of shutdowns required to replace said passive seals. Preferably, the proposed seal for RCD
should also be operable remotely to increase the personnel's safety around the wellbore.
SUMMARY OF THE INVENTION
To the inventors' knowledge ram blocks have never been used to seal around bearing assemblies used in RCD drilling operations. The advantages of using such would include but not be limited to:
minimize seal wear on bearing assemblies.
Accordingly, there is provided a RCD system comprising a seal which will reduce the load imparted on passive seals when said RCD is in operation.
According to a first aspect of the present invention, there is provided a rotating control apparatus, comprising:
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
EP patent application 2 995 712 A2 teaches a rotating control apparatus, comprising: an outer member; an inner member having a first sealing element and a second sealing element; said inner member, said first sealing element and said second sealing element rotatable relative to said outer member; a first cavity defined by said inner member, said first sealing element and said second sealing element; and said inner member having a port to said first cavity. The first sealing element being inflatable to adopt the configuration of the drill string during operations and deflatable to allow the drill string to pass through the RCD when tripping in or out of the wellbore.
Despite the existing prior art, there still exists a need for a robust seal for RCD which when in operation allows to increase the longevity of passive seals and therefore reduce the number of shutdowns required to replace said passive seals. Preferably, the proposed seal for RCD
should also be operable remotely to increase the personnel's safety around the wellbore.
SUMMARY OF THE INVENTION
To the inventors' knowledge ram blocks have never been used to seal around bearing assemblies used in RCD drilling operations. The advantages of using such would include but not be limited to:
minimize seal wear on bearing assemblies.
Accordingly, there is provided a RCD system comprising a seal which will reduce the load imparted on passive seals when said RCD is in operation.
According to a first aspect of the present invention, there is provided a rotating control apparatus, comprising:
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
3 Date Recue/Date Received 2021-03-05 - a bottom surface adapted for connection with a mud cross;
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
Preferably, each one of said at least two sealing members comprises a ram block adapted to extend through a side wall of the outer member and into the cavity.
According to a preferred embodiment of the present invention, each ram block comprises an inner surface adapted to sealingly engage with said inner member and a first and a second side wall, where each one of the first and second side walls is adapted to sealingly engage with a adjoining ram block when said at least two sealing members are in the closed position. Preferably, each one of the plurality of ram blocks comprises a top surface having a downward tapered edge. Preferably also, each one of the plurality of ram blocks comprises a bottom surface having an upward tapered edge.
According to a preferred embodiment of the present invention, each one of the plurality of ram blocks is actuated by a piston adapted to move the ram block from the open position to the closed position.
According to a preferred embodiment of the present invention, when the at least two sealing members are in the closed position they effect a complete seal with outer circumferential surface of the tubular. Preferably, when the at least two sealing members are in the closed position they lock the tubular in place and prevent any longitudinal movement from said inner member within the cavity.
According to a preferred embodiment of the present invention, the ram block cylinder assembly comprises the ram block and the cylinder housing.
According to a preferred embodiment of the present invention, the cylinder housing comprises the means to move the ram block from a first position where the ram block is fully retracted within the outer
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
Preferably, each one of said at least two sealing members comprises a ram block adapted to extend through a side wall of the outer member and into the cavity.
According to a preferred embodiment of the present invention, each ram block comprises an inner surface adapted to sealingly engage with said inner member and a first and a second side wall, where each one of the first and second side walls is adapted to sealingly engage with a adjoining ram block when said at least two sealing members are in the closed position. Preferably, each one of the plurality of ram blocks comprises a top surface having a downward tapered edge. Preferably also, each one of the plurality of ram blocks comprises a bottom surface having an upward tapered edge.
According to a preferred embodiment of the present invention, each one of the plurality of ram blocks is actuated by a piston adapted to move the ram block from the open position to the closed position.
According to a preferred embodiment of the present invention, when the at least two sealing members are in the closed position they effect a complete seal with outer circumferential surface of the tubular. Preferably, when the at least two sealing members are in the closed position they lock the tubular in place and prevent any longitudinal movement from said inner member within the cavity.
According to a preferred embodiment of the present invention, the ram block cylinder assembly comprises the ram block and the cylinder housing.
According to a preferred embodiment of the present invention, the cylinder housing comprises the means to move the ram block from a first position where the ram block is fully retracted within the outer
4 Date Recue/Date Received 2021-03-05 member of the rotating control apparatus and a second position where the ram block is fully extended into the aperture defined in the outer member.
Preferably, the means to move the ram block are selected from the group consisting of devices adapted to impart linear movement.
According to a preferred embodiment of the present invention, the device adapted to impart linear movement is selected from the group consisting of: air-actuated; hydraulic;
electrical; a wormgear or any other actuator adapted for this purpose.
According to a preferred embodiment of the present invention, the ram block comprises a body and a curved front surface adapted to sealingly abut against the outer surface of an inner member when in operation. Preferably, the ram block further comprises two side surfaces each of which having a protrusion and a cavity adapted for insertion into the cavity and protrusion of an adjoining ram block. More preferably, the body of the ram block comprises two opposite sides, a top and a bottom and a seal which surrounds the body to provide a sealing engagement with the ram block housing and prevent liquid migration between the wellbore and the cylinder chamber. Even more preferably, the ram block further comprises a seal on its front surface.
BRIEF DESCRIPTION OF THE FIGURES
The detailed description will be better understood in conjunction with the accompanying drawings as follows:
Figure 1 is a front perspective view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention;
Figure 2a is a top view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Figure 2b is a side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Date Recue/Date Received 2021-03-05 Figure 2c is a cross-sectional side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Figure 3a is a top view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3b is a side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3c is a cross-sectional side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3d is a close up of the cross-sectional side view of Figure 3c of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 4 is a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in an open position;
Figure 5 is a close up of a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in an open position;
Figure 6 is a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in a closed position; and Figure 7 is a close up of a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in a closed position.
Figure 8 is a side perspective view of a locking dog assembly for use in a RCD
according to a preferred embodiment of the present invention; and Date Recue/Date Received 2021-03-05 Figure 9 is a top cross-sectional view of the outer member bearing assembly for use in a RCD
according to a preferred embodiment of the present invention.
BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT
The cost of incorporating an RCD into a rig is meant to be offset by avoiding the consequences of not having one. Reducing the number of incidents and increasing the speed of drilling translates into lower costs for operators and owners alike. RCDs also allows operators to use lower mud weights in high-pressure environments, which reduces the costs associated with mud as well as the volumes of mud required. RCDs also allows the exploitation of reservoirs which may be very difficult to access. The use of RCDs also provides an effective means of managing drilling hazards, as they are intended to provide a gas-tight seal that protects operators, employees and the environment. RCDs are designed to divert toxic gas, such as hydrogen sulfide, away from the rig floor to protect personnel present on the rig. RCDs also prevent gas influxes from reaching above the blowout preventer and entering the riser creating serious safety hazard situations.
According to a preferred embodiment of the present invention as illustrated in Figures 1 to 9, there is provided a RCD (1) having a main seal comprised of 6 ram blocks operating together to conform to the shape (preferably a cavity) of a inner member (4) being inserted into the RCD.
During the installation of a tool or passing a tubular through the RCD bowl (tripping in or out), the pistons moving the ram blocks are all actuated to move the ram blocks towards an "open" configuration where the inner surface of the ram blocks define a diameter inside the RCD
which is at least as large or larger than the inner diameter of the RCD bowl. This allows the tool or tubular to move within the RCD
bowl by minimizing the contact and friction against the high pressure radial seals and thus minimize the potential damage to the seals. The replacement of the high pressure seals remains the most common reason for the shutdown of operations and minimizing this occurrence directly translates in increased production and a decrease in operational costs.
According to a preferred embodiment of the present invention, the ram blocks are present in such a way as to provide a good, robust seal with the tubular nestled within the RCD bowl. Preferably, there are 6 ram blocks each of which is actuated by a piston. Consequently, there is a piston assembly for each ram block which provides the movement for the ram block.
Date Recue/Date Received 2021-03-05 Open position By referring to Figures 4 and 5, one notes that inner (front) surface (27) of the ram block (7) is recessed beyond the inner diameter of the RCD bowl. This is to allow the tubular and tools to pass through the RCD bowl without risking any damage to the ram blocks which provide together the primary seal between the RCD and the tubular when in operation. In Figure 4, when referring to the piston chamber (43), one notes that the piston (41) is completely recessed into the piston or cylinder chamber (43).
According to another preferred embodiment, the piston may only be partially recessed within the piston chamber to allow the ram block to be fully opened.
As seen in Figure 7, the ram block (7) preferably comprises sealing elements (29) which surrounds the entire ram body to prevent leakage of wellbore fluids into the piston chamber (43).
Intermediate position By referring to Figure 2a, there can be observed a gap (25) between the side walls of each one of the ram blocks. This is evidence that there is no seal completed between the outer member (3) and the inner member (4). This also shows that while the side walls of the ram blocks are straight and must abut against the neighboring side walls of the neighboring ram blocks in such a way as to provide a seal there as well.
According to a preferred embodiment of the present invention, the side walls may comprise a sealing material adapted to maintain a leak proof seal between the side walls of each one of the ram blocks.
According to a preferred embodiment of the present invention, the number of ram blocks is determined by the amount equipment allotted to operate the device. In some instances, it may be desirable to have fewer ram blocks and therefore, one could conceivably have only two ram blocks, each of which would cover half of the circumference of the tubular when in the closed position. Other embodiments may employ 3, 4, 5, 6 or even more ram blocks depending on the operating parameters (such as temperature or any other factor).
Closed position By referring to Figure 3a, there can be observed the absence of the gap previously present between the side walls of each one of the ram blocks when the ram blocks are in the intermediate position. This is evidence that the seal is complete between the RCD and the tubular. This also shows that, to provide a proper seal, the side walls of each one of the ram blocks must abut against the side walls of the neighboring Date Recue/Date Received 2021-03-05 ram block. According to a preferred embodiment of the present invention, the side walls may comprise a sealing material adapted to maintain a leak proof seal between the side walls of each one of the ram blocks.
According to a preferred embodiment, when in the closed position, the ram block forms a seal which is not only leak proof but is also supporting the structure (tubular or tool) which is located within the RCD bowl. This has a substantial impact on the longevity of the high pressure radial seals (see Figure 7 reference numerals 66 and 66') which are located below the ram block body seal (29). Reducing the load put on the high pressure radial seals will allow operators to minimize the number of shutdowns required to replace said seals.
Figure 8 illustrates a preferred embodiment of the ram block cylinder assembly
Preferably, the means to move the ram block are selected from the group consisting of devices adapted to impart linear movement.
According to a preferred embodiment of the present invention, the device adapted to impart linear movement is selected from the group consisting of: air-actuated; hydraulic;
electrical; a wormgear or any other actuator adapted for this purpose.
According to a preferred embodiment of the present invention, the ram block comprises a body and a curved front surface adapted to sealingly abut against the outer surface of an inner member when in operation. Preferably, the ram block further comprises two side surfaces each of which having a protrusion and a cavity adapted for insertion into the cavity and protrusion of an adjoining ram block. More preferably, the body of the ram block comprises two opposite sides, a top and a bottom and a seal which surrounds the body to provide a sealing engagement with the ram block housing and prevent liquid migration between the wellbore and the cylinder chamber. Even more preferably, the ram block further comprises a seal on its front surface.
BRIEF DESCRIPTION OF THE FIGURES
The detailed description will be better understood in conjunction with the accompanying drawings as follows:
Figure 1 is a front perspective view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention;
Figure 2a is a top view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Figure 2b is a side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Date Recue/Date Received 2021-03-05 Figure 2c is a cross-sectional side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in an intermediate position;
Figure 3a is a top view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3b is a side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3c is a cross-sectional side view of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 3d is a close up of the cross-sectional side view of Figure 3c of a bearing assembly for use in a RCD according to a preferred embodiment of the present invention where the locking dogs are in a closed position;
Figure 4 is a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in an open position;
Figure 5 is a close up of a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in an open position;
Figure 6 is a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in a closed position; and Figure 7 is a close up of a cross-sectional side view of a bearing assembly for use in a RCD
according to a preferred embodiment of the present invention where the locking dogs are in a closed position.
Figure 8 is a side perspective view of a locking dog assembly for use in a RCD
according to a preferred embodiment of the present invention; and Date Recue/Date Received 2021-03-05 Figure 9 is a top cross-sectional view of the outer member bearing assembly for use in a RCD
according to a preferred embodiment of the present invention.
BRIEF DESCRIPTION OF A PREFERRED EMBODIMENT
The cost of incorporating an RCD into a rig is meant to be offset by avoiding the consequences of not having one. Reducing the number of incidents and increasing the speed of drilling translates into lower costs for operators and owners alike. RCDs also allows operators to use lower mud weights in high-pressure environments, which reduces the costs associated with mud as well as the volumes of mud required. RCDs also allows the exploitation of reservoirs which may be very difficult to access. The use of RCDs also provides an effective means of managing drilling hazards, as they are intended to provide a gas-tight seal that protects operators, employees and the environment. RCDs are designed to divert toxic gas, such as hydrogen sulfide, away from the rig floor to protect personnel present on the rig. RCDs also prevent gas influxes from reaching above the blowout preventer and entering the riser creating serious safety hazard situations.
According to a preferred embodiment of the present invention as illustrated in Figures 1 to 9, there is provided a RCD (1) having a main seal comprised of 6 ram blocks operating together to conform to the shape (preferably a cavity) of a inner member (4) being inserted into the RCD.
During the installation of a tool or passing a tubular through the RCD bowl (tripping in or out), the pistons moving the ram blocks are all actuated to move the ram blocks towards an "open" configuration where the inner surface of the ram blocks define a diameter inside the RCD
which is at least as large or larger than the inner diameter of the RCD bowl. This allows the tool or tubular to move within the RCD
bowl by minimizing the contact and friction against the high pressure radial seals and thus minimize the potential damage to the seals. The replacement of the high pressure seals remains the most common reason for the shutdown of operations and minimizing this occurrence directly translates in increased production and a decrease in operational costs.
According to a preferred embodiment of the present invention, the ram blocks are present in such a way as to provide a good, robust seal with the tubular nestled within the RCD bowl. Preferably, there are 6 ram blocks each of which is actuated by a piston. Consequently, there is a piston assembly for each ram block which provides the movement for the ram block.
Date Recue/Date Received 2021-03-05 Open position By referring to Figures 4 and 5, one notes that inner (front) surface (27) of the ram block (7) is recessed beyond the inner diameter of the RCD bowl. This is to allow the tubular and tools to pass through the RCD bowl without risking any damage to the ram blocks which provide together the primary seal between the RCD and the tubular when in operation. In Figure 4, when referring to the piston chamber (43), one notes that the piston (41) is completely recessed into the piston or cylinder chamber (43).
According to another preferred embodiment, the piston may only be partially recessed within the piston chamber to allow the ram block to be fully opened.
As seen in Figure 7, the ram block (7) preferably comprises sealing elements (29) which surrounds the entire ram body to prevent leakage of wellbore fluids into the piston chamber (43).
Intermediate position By referring to Figure 2a, there can be observed a gap (25) between the side walls of each one of the ram blocks. This is evidence that there is no seal completed between the outer member (3) and the inner member (4). This also shows that while the side walls of the ram blocks are straight and must abut against the neighboring side walls of the neighboring ram blocks in such a way as to provide a seal there as well.
According to a preferred embodiment of the present invention, the side walls may comprise a sealing material adapted to maintain a leak proof seal between the side walls of each one of the ram blocks.
According to a preferred embodiment of the present invention, the number of ram blocks is determined by the amount equipment allotted to operate the device. In some instances, it may be desirable to have fewer ram blocks and therefore, one could conceivably have only two ram blocks, each of which would cover half of the circumference of the tubular when in the closed position. Other embodiments may employ 3, 4, 5, 6 or even more ram blocks depending on the operating parameters (such as temperature or any other factor).
Closed position By referring to Figure 3a, there can be observed the absence of the gap previously present between the side walls of each one of the ram blocks when the ram blocks are in the intermediate position. This is evidence that the seal is complete between the RCD and the tubular. This also shows that, to provide a proper seal, the side walls of each one of the ram blocks must abut against the side walls of the neighboring Date Recue/Date Received 2021-03-05 ram block. According to a preferred embodiment of the present invention, the side walls may comprise a sealing material adapted to maintain a leak proof seal between the side walls of each one of the ram blocks.
According to a preferred embodiment, when in the closed position, the ram block forms a seal which is not only leak proof but is also supporting the structure (tubular or tool) which is located within the RCD bowl. This has a substantial impact on the longevity of the high pressure radial seals (see Figure 7 reference numerals 66 and 66') which are located below the ram block body seal (29). Reducing the load put on the high pressure radial seals will allow operators to minimize the number of shutdowns required to replace said seals.
Figure 8 illustrates a preferred embodiment of the ram block cylinder assembly
(5) according to the present invention. The ram block cylinder assembly (5) comprises the ram block (7) and the cylinder housing (86). The cylinder housing (86) comprises the means to move the ram block (7) from a first position where the ram block is fully retracted within the outer member of the rotating control apparatus and a second position where the ram block is fully extended into the aperture defined in the outer member and interlocks with adjoining ram blocks.
According to the preferred embodiment illustrated in Figures 8 and 9, the ram block comprises a curved front surface (27) adapted to sealingly abut against the outer surface of an inner member when in operation. Preferably, the front surface has a beveled edge (31). The ram block (7) also comprises two side surfaces (84) each of which having a protrusion (81) and a cavity (82) adapted for insertion into the cavity and protrusion of adjoining ram blocks. According to a preferred embodiment, there is an angled surface (83) separating the The presence of protrusions and cavities on each ram block allows for an interlocking of ram blocks with one another providing a structural locking of the ram blocks when each one is fully extended. This way, ram blocks when interlocked with one another provide a much more secure lock with the inner member and thus minimizes potential damages caused by torsion forces exerted on the inner member during operations. The ram block also comprises a seal (29) which surrounds the body of the ram block (sides (84), top and bottom (85) so as to provide a seal between the cylinder chamber (43) and the wellbore.
Figure 9 is a top cross-sectional view of an outer member showing pairs of ram blocks (pair Al and A2, pair B1 and B2 and pair Cl and C2) each of which are at a different stage of extension through their housing. The ram block pair Al and A2 can be seen to be fully retracted within their respective housing and the protrusions (81 and 81') can clearly be seen on their sides.
They are considered to be Date Recue/Date Received 2021-03-05 independent from one another as they have no structural interaction, i.e. no interlocking of any kind between one another at this point. Their front surfaces (A1-27 and A2-27) are within the outer member's (3) inner circumference.
The ram blocks of pair B (B1 and B2) can be seen to be extending from their housing (53 and 53') but the protrusions (81" and 81ยจ) can still be clearly seen on their sides.
They are still considered to be independent from one another as they have no structural interaction, i.e. no interlocking of any kind between one another at this point. Their front surfaces (B1-27 and B2-27) extend beyond the outer member's inner circumference.
The ram blocks of pair C (Cl and C2) can be seen to be fully extended from their housing and their protrusions can no longer be seen on their sides. They are considered to no longer be independent from one another as they have structural interaction, there is interlocking between them as the protrusion of ram block Cl is fully inside the corresponding cavity found of ram block C2 at this point. Their front surfaces (C1-27 and C2-27) form a semi-circle as is expected when adjoining ram block are fully extended. To note, as can be seen, in the space between ram block C2 and ram block B1 the protrusion (91) located on ram block C2 has already started its insertion into the corresponding cavity located on ram block B1, there is a beginning of a structural interaction between these two adjoining ram blocks.
Also ssen in Figure 9, bolts (92) to secure piston chamber assembly (5) to the outer member (3).
Connected to ram block Cl are the piston (87), piston plate (99) adapted to sealingly fit into the piston chamber (43). A pair of inner seals (94) and outer seals (96) located around the inner and outer walls respectively of the chamber to provide a seal to the piston (87) as it moves the ram block from a first -open"
position to a second -closed" position upon actuation of the ram block (7). A
large space (43) is seen in the chamber due to the movement of the piston and, correspondingly, the piston plate (99) to position the ram block Cl in a closed position. Looking at the piston chamber of ram block Al, one notes that the space is in front of the piston plate as the ram block is completely retracted within its housing. The inner seal and outer seals located on the piston are positioned to sealingly engage the front and back walls (respectively) of the piston cylinder chamber throughout the entire range of movement of a ram block.
The piston plate can be integrally mounted on the piston or assembled thereon.
Preferably, located within a mid-section of the piston and adapted to fit within the piston chamber so as to abut against each of the internal surfaces of the piston chamber.
Date Recue/Date Received 2021-03-05 As would be understood by the person skilled in the art, the protrusion and cavities on the ram blocks can take many different types of shapes so long as they are adapted to fit into an adjoining ram block.
A ram block having alternating protrusions and cavities (i.e. on one side the protrusion is at the top and on the other side of the ram block the protrusion is at the bottom) may be desirable as it allows on type of ram block to be used throughout the device. Alternatively, a ram block may have only one protrusion on one side and one cavity of the opposite side. Another alternative is that the ram blocks have no protrusion nor any cavities. Any number of possible alternatives are considered to be within the scope of this invention depending on the expected use and requirements.
Preferably, the ram blocks have a sealing element to sealingly engage with the ram block housing to prevent contamination of the ram block cylinder chamber from liquids from the wellbore. Any type of material capable of withstanding the pressures and temperatures which RCD will undergo can be used as sealing material.
According to a preferred embodiment of the present invention, the ram block assembly can be removed from the outer member by removing the bolts securing the assembly to the outer member and sliding the ram block out from its housing and disconnecting the hydraulic fluid inlet and outlet hoses.
As is understood by the person skilled in the art to which this disclosure is addressed, the sealing member described and disclosed in this description can take different forms but still be considered to be part of the inventive concept as described and illustrated herein. The embodiments described herein are to be understood to be exemplary and numerous modification and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims appended hereto, the invention may be practiced otherwise than as specifically disclosed herein.
Date Recue/Date Received 2021-03-05
According to the preferred embodiment illustrated in Figures 8 and 9, the ram block comprises a curved front surface (27) adapted to sealingly abut against the outer surface of an inner member when in operation. Preferably, the front surface has a beveled edge (31). The ram block (7) also comprises two side surfaces (84) each of which having a protrusion (81) and a cavity (82) adapted for insertion into the cavity and protrusion of adjoining ram blocks. According to a preferred embodiment, there is an angled surface (83) separating the The presence of protrusions and cavities on each ram block allows for an interlocking of ram blocks with one another providing a structural locking of the ram blocks when each one is fully extended. This way, ram blocks when interlocked with one another provide a much more secure lock with the inner member and thus minimizes potential damages caused by torsion forces exerted on the inner member during operations. The ram block also comprises a seal (29) which surrounds the body of the ram block (sides (84), top and bottom (85) so as to provide a seal between the cylinder chamber (43) and the wellbore.
Figure 9 is a top cross-sectional view of an outer member showing pairs of ram blocks (pair Al and A2, pair B1 and B2 and pair Cl and C2) each of which are at a different stage of extension through their housing. The ram block pair Al and A2 can be seen to be fully retracted within their respective housing and the protrusions (81 and 81') can clearly be seen on their sides.
They are considered to be Date Recue/Date Received 2021-03-05 independent from one another as they have no structural interaction, i.e. no interlocking of any kind between one another at this point. Their front surfaces (A1-27 and A2-27) are within the outer member's (3) inner circumference.
The ram blocks of pair B (B1 and B2) can be seen to be extending from their housing (53 and 53') but the protrusions (81" and 81ยจ) can still be clearly seen on their sides.
They are still considered to be independent from one another as they have no structural interaction, i.e. no interlocking of any kind between one another at this point. Their front surfaces (B1-27 and B2-27) extend beyond the outer member's inner circumference.
The ram blocks of pair C (Cl and C2) can be seen to be fully extended from their housing and their protrusions can no longer be seen on their sides. They are considered to no longer be independent from one another as they have structural interaction, there is interlocking between them as the protrusion of ram block Cl is fully inside the corresponding cavity found of ram block C2 at this point. Their front surfaces (C1-27 and C2-27) form a semi-circle as is expected when adjoining ram block are fully extended. To note, as can be seen, in the space between ram block C2 and ram block B1 the protrusion (91) located on ram block C2 has already started its insertion into the corresponding cavity located on ram block B1, there is a beginning of a structural interaction between these two adjoining ram blocks.
Also ssen in Figure 9, bolts (92) to secure piston chamber assembly (5) to the outer member (3).
Connected to ram block Cl are the piston (87), piston plate (99) adapted to sealingly fit into the piston chamber (43). A pair of inner seals (94) and outer seals (96) located around the inner and outer walls respectively of the chamber to provide a seal to the piston (87) as it moves the ram block from a first -open"
position to a second -closed" position upon actuation of the ram block (7). A
large space (43) is seen in the chamber due to the movement of the piston and, correspondingly, the piston plate (99) to position the ram block Cl in a closed position. Looking at the piston chamber of ram block Al, one notes that the space is in front of the piston plate as the ram block is completely retracted within its housing. The inner seal and outer seals located on the piston are positioned to sealingly engage the front and back walls (respectively) of the piston cylinder chamber throughout the entire range of movement of a ram block.
The piston plate can be integrally mounted on the piston or assembled thereon.
Preferably, located within a mid-section of the piston and adapted to fit within the piston chamber so as to abut against each of the internal surfaces of the piston chamber.
Date Recue/Date Received 2021-03-05 As would be understood by the person skilled in the art, the protrusion and cavities on the ram blocks can take many different types of shapes so long as they are adapted to fit into an adjoining ram block.
A ram block having alternating protrusions and cavities (i.e. on one side the protrusion is at the top and on the other side of the ram block the protrusion is at the bottom) may be desirable as it allows on type of ram block to be used throughout the device. Alternatively, a ram block may have only one protrusion on one side and one cavity of the opposite side. Another alternative is that the ram blocks have no protrusion nor any cavities. Any number of possible alternatives are considered to be within the scope of this invention depending on the expected use and requirements.
Preferably, the ram blocks have a sealing element to sealingly engage with the ram block housing to prevent contamination of the ram block cylinder chamber from liquids from the wellbore. Any type of material capable of withstanding the pressures and temperatures which RCD will undergo can be used as sealing material.
According to a preferred embodiment of the present invention, the ram block assembly can be removed from the outer member by removing the bolts securing the assembly to the outer member and sliding the ram block out from its housing and disconnecting the hydraulic fluid inlet and outlet hoses.
As is understood by the person skilled in the art to which this disclosure is addressed, the sealing member described and disclosed in this description can take different forms but still be considered to be part of the inventive concept as described and illustrated herein. The embodiments described herein are to be understood to be exemplary and numerous modification and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the claims appended hereto, the invention may be practiced otherwise than as specifically disclosed herein.
Date Recue/Date Received 2021-03-05
Claims (16)
1. A rotating control apparatus, comprising:
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
- a bottom surface adapted for connection with a mud cross;
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
- an outer member (RCD bowl); and - an inner member (bearing assembly housing);
said outer member comprising:
- a top surface defining an aperture adapted to accommodate the insertion and removal of the inner member;
- an inner circular surface defining a cavity;
- a side wall;
- an outer casing;
- a bottom surface adapted for connection with a mud cross;
- at least two sealing members capable of moving between a closed position and an open position, where the at least two sealing members are adapted to sealingly engage and lock said inner member inserted inside said cavity when in a closed position and allowing said inner member to be inserted therethrough or removed from the inner member when the at least two sealing members are in the open position;
said inner member comprising:
- a first sealing element and a second sealing element adapted to sealingly abut against said inner surface of said outer member; said inner member, first sealing element and second sealing element being rotatable relative to said outer member.
2. A rotating control apparatus according to claim 1, where each one of said at least two sealing members comprises a ram block adapted to extend through a side wall of the outer member and into the cavity.
3. A rotating control apparatus according to claim 2, where each ram block comprises an inner surface adapted to sealingly engage with said inner member and a first and a second side wall, where each one of the first and second side walls is adapted to sealingly engage with a adjoining ram block when said at least two sealing members are in the closed position.
4. A rotating control apparatus according to any one of claims 2 to 3, where the each one of the plurality of ram blocks comprises a top surface having a downward tapered edge.
5. A rotating control apparatus according to any one of claims 2 to 4, where the each one of the plurality of ram blocks comprises a bottom surface having an upward tapered edge.
6. A rotating control apparatus according to any one of claims 1 to 5, where the each one of the plurality of ram blocks is actuated by a piston adapted to move the ram block from the open position to the closed position.
7. A rotating control apparatus according to any one of claims 1 to 5, wherein when the at least two sealing members are in the closed position they effect a complete seal with outer circumferential surface of the tubular.
8. A rotating control apparatus according to claim 7, wherein when the at least two sealing members are in the closed position they lock the tubular in place and prevent any longitudinal movement from said inner member within the cavity.
9. The rotating control apparatus according to claim 7, wherein the ram block cylinder assembly comprises the ram block and the cylinder housing.
10. The rotating control apparatus according to claim 9, wherein the cylinder housing comprises the means to move the ram block from a first position where the ram block is fully retracted within the outer member of the rotating control apparatus and a second position where the ram block is fully extended into the aperture defined in the outer member.
11. The rotating control apparatus according to claim 10, wherein the means to move the ram block are selected from the group consisting of devices adapted to impart linear movement.
12. The rotating control apparatus according to claim 11, wherein the device adapted to impart linear movement is selected from the group consisting of: air-actuated; hydraulic;
electrical; a wormgear or any other actuator adapted for this purpose.
electrical; a wormgear or any other actuator adapted for this purpose.
13. The rotating control apparatus according to claim 11, wherein the ram block comprises a body and a curved front surface adapted to sealingly abut against the outer surface of an inner member when in operation.
14. The rotating control apparatus according to claim 12, wherein the ram block further comprises two side surfaces each of which having a protrusion and a cavity adapted for insertion into the cavity and protrusion of an adjoining ram block.
15. The rotating control apparatus according to claim 14, wherein the body of the ram block comprises two opposite sides, a top and a bottom and a seal which surrounds the body to provide a sealing engagement with the ram block housing and prevent liquid migration between the wellbore and the cylinder chamber.
16. The rotating control apparatus according to any one of claims 1 to 15, wherein the ram block further comprises a seal on its front surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3111310A CA3111310A1 (en) | 2021-03-05 | 2021-03-05 | Rotating control device seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3111310A CA3111310A1 (en) | 2021-03-05 | 2021-03-05 | Rotating control device seal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA3111310A1 true CA3111310A1 (en) | 2022-09-05 |
Family
ID=83103356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA3111310A Pending CA3111310A1 (en) | 2021-03-05 | 2021-03-05 | Rotating control device seal |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA3111310A1 (en) |
-
2021
- 2021-03-05 CA CA3111310A patent/CA3111310A1/en active Pending
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