Wells – Processes – Assembling well part
Reexamination Certificate
2002-07-03
2003-11-25
Dang, Hoang (Department: 3672)
Wells
Processes
Assembling well part
C166S084100, C166S085400, C166S086300, C166S386000, C166S387000, C175S057000, C175S317000, C251S001300
Reexamination Certificate
active
06651746
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The system of the present invention relates to high torque and high capacity rotatable center core and floatable seal body assemblies with universal ram applications and the method of undertaking same. More particularly, the present invention relates to an apparatus that would allow one to pick up the entire weight of the drill string tubing or pipe which would allow one to rotate from the top and have the torque completely through it while rotating.
2. General Background of the Invention
In undertaking wireline work utilizing a side entry device in the present state of the art, the device includes a packoff assembly or grease seal assembly at the entry to the side entry port or top entry port which provides for protection against blowouts while the device is in use. However, while wireline is being lowered through the device, there must be an additional method to seal off the passageway while the wireline is in place. Therefore, there are provided blowout preventors positioned below the wireline packoff on the side entry device which may be manually or hydraulically closed to seal oft the wireline in case of a blowout. Such blowout preventors are manufactured by, for example, Bowen Inc. under the name.
However, it would be beneficial to have such a blowout preventor located in the drill string itself, above the rig floor, which would allow the wireline to be sealed off below the swivel. In that manner, when the drill string below the swivel needs to be rotated to provide torque, the blowout preventors would simply rotate with the drill string. However, in the case of a blowout, or in the event work needed to be done above the swivel above this side entry device, while the well is under pressure, the blowout preventors could be closed off. The type of blowout preventors currently used, as discussed above, manufactured by Bowen Inc., would not have the capability of being placed within the drill string, since the device could not withstand the enormous weight of the drill string below the preventors. So, there is a need for a type of blowout preventors that can be positioned below the swivel, within the drill string, that can be maintained open, and allow to rotate freely with the string, but in the event work needed to be done above the device, the blowout preventors would be closed, and the well, although under pressure would not be capable of blowing out during the curative work. The system of the present invention solves many problems in the art.
BRIEF SUMMARY OF THE INVENTION
An apparatus for use in a drill string is disclosed. The apparatus comprises an inner core assembly having a first and second transverse bore, and has a shoulder formed thereon. A first outer core assembly is slidably disposed about the inner core assembly and rests on the shoulder. The outer core assembly has a first and second transverse bore that is aligned with the first and second transverse bore of said inner core assembly.
The apparatus further comprises a first piston means, disposed within the first and second transverse bore of the outer core assembly, for closing an internal longitudinal bore of the inner core assembly. The apparatus further comprises a ring inserted into an indentation on the inner core assembly, with the ring abutting a top surface of the outer core assembly. A pin means for maintaining the inner core assembly in line with the first outer core assembly may also be included. In one of the preferred embodiments, the inner core assembly is connected at one end to a drill string and at the other end to a swivel.
In one embodiment, the first piston means comprises a first piston member disposed within the first transverse bore of the outer core assembly, a second piston member disposed within the second transverse bore of the outer core assembly, and means for moving the first and second piston member into the internal longitudinal bore of the inner core assembly in order to close seal the internal bore. The first piston member may include a first sleeve disposed within the first transverse bore of the outer core assembly; and the second piston member may include a second sleeve disposed within the second transverse bore of the outer core assembly.
In one of the embodiments, the apparatus further comprises a third and fourth transverse bore positioned within the inner core assembly and a third and fourth transverse bore positioned within the first outer core assembly that is aligned with the third and fourth transverse bore of the inner core assembly. A second piston means, disposed within the third and fourth transverse bore of the outer core assembly, is included for closing the internal longitudinal bore of the inner core assembly.
In another embodiment, a second outer core assembly is slidably disposed about the inner core assembly and rests on a first outer surface of the first outer core assembly, and wherein the second outer core assembly has a third and fourth transverse bore that is aligned with a third and fourth transverse bore located within the inner core assembly. With this embodiment, a second piston means, disposed within the third and fourth transverse bore of the second outer core assembly, is included for closing the internal longitudinal bore of the inner core assembly. In this embodiment, the first and second piston means comprises: a first piston member disposed within the first transverse bore of the first outer core assembly; a second piston member disposed within the second transverse bore of the first outer core assembly; a third piston member disposed within the third transverse bore of the second outer core assembly; a fourth piston member disposed within the fourth transverse bore of the second outer core assembly; and, means for moving the first, second, third, and fourth piston members into the internal longitudinal bore in order to close the internal longitudinal bore.
A method of sealing off flow in a work string is also disclosed. The method comprises providing an apparatus containing an inner core assembly having a first and second transverse bore, and a shoulder formed thereon; a first outer core assembly slidably disposed about the inner core assembly and resting on the shoulder, the outer core assembly having a first and second transverse bore that is aligned with the first and second transverse bore of the inner core assembly; first piston means, disposed within the first and second transverse bore of the outer core assembly, for closing an internal longitudinal bore disposed through the inner core assembly.
The method further comprises connecting the work string to the inner core assembly and transmitting the weight of the drill string to the inner core assembly. Next, the work string is rotated so that a torque is created, and the torque is transmitted through the inner core assembly. The rotation of the work string is terminated. The first piston means is closed in order to close off the internal longitudinal bore of the inner core assembly. Next, the first piston means is opened thereby opening the internal longitudinal bore.
A concentric work string, such as wireline, is provided within the internal longitudinal bore. The concentric work string may have attached thereto a down hole assembly. The concentric work string is run down the work string with the down hole assembly. Next, the first piston means is closed about the wireline within the internal longitudinal bore. Curative work may be performed on the wireline above the first piston means. Next, the first piston means is opened so that the internal longitudinal bore is unsealed. The concentric work string can then be pulled from the work string.
In another embodiment, at least one blowout preventor is positioned within the drill string, above the rig floor, between a swivel and a length of drill pipe below. The apparatus includes an outer core assembly (sometimes referred to as a principal body portion) having a central bore for accommodating an inner core assembly (sometimes referred to as a central assembly), having a firs
Dang Hoang
Dominque & Waddell PLC
LandOfFree
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