Wells – With electrical means – Magnetic
Reexamination Certificate
2000-07-24
2002-08-13
Dang, Hoang (Department: 3672)
Wells
With electrical means
Magnetic
C166S050000, C166S055700, C175S098000
Reexamination Certificate
active
06431270
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates generally to downhole tools for use in the oilfield and more particularly to downhole tools having a mobility device that can move the tool in the wellbore and an end work device for performing a desired operation at a selected work sites in the wellbore.
2. Background of the Art
To produce hydrocarbons (oil and gas) from the earth's formations, wellbores are formed to desired depths. Branch or lateral wellbores are frequently drilled from a main wellbore to form deviated or horizontal wellbores for recovering hydrocarbons or improving production of hydrocarbons from subsurface formations. A large proportion of the current drilling activity involves drilling highly deviated and horizontal wellbores.
The formation of a production wellbore involves a number of different operations. Such operations include completing the wellbore by cementing a pipe or casing in the wellbore, forming windows in the main wellbore casing to drill and complete lateral or branch wellbores, other cutting and milling operations, re-entering branch wellbores to perform desired operations, perforating, setting devices in the wellbore such as plugs and sliding sleeves, remedial operations such as stimulating and cleaning, testing and inspection, including determining the quality and integrity of junctures, testing production from perforated zones, collecting and analyzing fluid samples, and analyzing cores.
Oilfield wellbores usually continue to produce hydrocarbons for many years. Various types of operations are performed during the life of producing wellbores. Such operations include removing, installing and replacing different types of devices, including fluid flow control devices, sensors, packers or seals, remedial work including sealing off zones, cementing, reaming, repairing junctures, milling and cutting, diverting fluid flows, controlling production from perforated zones, activating or sliding sleeves, testing wellbore production zones or portions thereof, and making periodic measurements relating to wellbore and formation parameters.
To perform downhole operations, whether during the completion phase, production phase, or for servicing and maintaining the wellbore, a bottomhole assembly is conveyed into the wellbore. The bottomhole assembly is then positioned in the wellbore at a desired work site and the desired operation is performed. This requires a rig at the wellhead and a conveying means, which is typically a coiled tubing or a jointed pipe. Such operations usually require a rig at the wellbore and means for conveying the tubings into the wellbore.
During the wellbore completion phase, the rig is normally present at the wellhead. Occasionally, the large drilling rig is removed and a smaller work rig is erected to perform completion operations. However, many operations during the completion phase can be performed without the use of a rig if a mobility device could be utilized to move and position the bottomhole assembly into the wellbore, especially in the horizontal sections of the wellbores. During the production phase or for workover or testing operations, a rig is especially erected at the well site prior to performing many of the operations, which can be time consuming and expensive. The primary function of the rig in some of such operations is to convey the bottomhole assembly into the wellbore and to a lesser extent position and orient the bottomhole assembly at the desired work site. A mobility device that can move and position the bottomhole assembly at the desired work site can allow performing the desired downhole operations without requiring a rig and bulky tubings and tubing handling systems. Additionally, downhole tools with a mobility system, an imaging device and an end work device can perform many of the downhole operations automatically without a rig. Additionally, such downhole tools can be left in the production wellbores for extended time periods to perform many operations according to commands supplied from the surface or stored in the tool. Such operations may include periodically operating sliding sleeves and control valves, and performing testing and data gathering operations.
U.S. Pat. No. 5,186,264 to du Chaffaut, U.S. Pat. No. 5,316,094 to Pringle (Pringle '094), U.S. Pat. No. 5,373,898 to Pringle (Pringle '898) and U.S. Pat. No. 5,394,951 to Pringle et al. disclose certain structures for guiding downhole tools in the wellbores. The du Chaffaut patent discloses a device for guiding a drilling tool into a wellbore. Radially displaceable pistons, in an extension position, come into anchoring engagement with the wall of the wellbore and immobilize an external sleeve. A jack displaces the body and the drilling tool integral therewith with respect to the external sleeve and exerts a pushing force onto the tool. Hydraulic circuits and control assemblies are provided for controlling the execution of a series of successive cycles of anchoring the external sleeve in the well and of displacement of the drilling tool with respect to the external sleeve.
The Pringle '094 patent discloses an orientation mandrel that is rotatable in an orientation body for providing rotational orientation. A thruster connects to the orientation mandrel for engaging the wellbore by a plurality of elongate gripping bars. An annular thruster piston is hydraulically and longitudinally movable in the thruster body for extending the thruster mandrel outwardly from the thruster body, independently of an orientating tool.
The Pringle '898 patent discloses a tool with an elongate circular body and a fluid bore therethrough. A fixed plate extends radially between the bore and the body. A rotatable piston extends between the enclosed bore and the body and is rotatable about the enclosed bore. A hydraulic control line extends longitudinally to a piston between the plate and the piston for rotating the piston. The tool may act as orientation tool and include a rotatable mandrel actuated by the piston. A spring recocks the piston and a valve means for admitting and venting fluid from the piston.
The Pringle et al. patent discloses a bottomhole drilling assembly connectable to a coiled tubing that is controlled from the surface. A downhole motor rotates a drill bit, an articulate sub that causes the drill bit to drill a curved bore hole. A steering tool indicates the attitude of the bore hole. A thruster provides force to advance the drill bit. An orientating tool rotates the thruster relative to a coiled tubing to control the path of the borehole.
Another series of patents disclose apparatus for moving through the interior of a pipe. These include U.S. Pat. No. 4,862,808 to Hedgcoxe et al., U.S. Pat. No. 5,203,646 to Landsberger et al. and U.S. Pat. No. 5,392,715 to Pelrine. The Hedgcoxe et al. patent discloses a robotic pipe crawling device with two three-wheel modules pivotally connected at their centers. Each module has one idler wheel and two driven wheels, an idler yoke and a driveline yoke chassis with parallel laterally spaced rectangular side plates. The idler side plates are pinned at one end of the chassis and the idler wheel is mounted on the other end. The driveline side plates are pinned to the chassis and the drive wheels are rotatably mounted one at each end. A motor at each end of the chassis pivots the wheel modules independently into and out of a wheel engaging position on the interior of the pipe and a drive motor carried by the driveline yoke drives two drive wheels in opposite directions to propel the device. A motor mounted within each idler yoke allows them to pivot independently of the driveline yokes. A swivel joint in the chassis midsection allows each end to rotate relative to the other. The chassis may be extended with additional driveline yokes. In addition to a straight traverse, the device is capable of executing a “roll sequence” to change its orientation about its longitudinal axis, and “L”, “T” and “Y” cornering sequences. Connected with a computer the device can “learn”
Dang Hoang
Herbster George A.
Intelligent Inspection Corporation
LandOfFree
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