Wells – Above ground apparatus – Moving tubing or cable into an existing well
Patent
1997-06-18
1998-12-15
Bagnell, David J.
Wells
Above ground apparatus
Moving tubing or cable into an existing well
13735516, 191 124, E21B 1922, H02G 1102
Patent
active
058486429
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
When drilling for oil and gas it is common to use so called coil tubing to guide tools and instruments down into a well.
It is usual that tools mounted at the end of the coil tubing, operate hydraulic motors or actuators. Then, hydraulic power is supplied when circulation liquid is pumped down through the coil tubing by means of a pump at the surface. Alternatively, an electrically driven downhole pump is used, operating the hydraulic tool by means of liquid taken from the well, normally in the vicinity of the tool.
In downhole operations, the circulation liquid pumped through the coil tubing often serves several purposes. The circulation liquid is often not homogenous and, thus, less suitable for driving hydraulic tools. The circulation liquid may e.g. be admixed inert gas in order to improve the lifting capability for cuttings.
When several tools are in operation simultaneously, e.g. a downhole bit motor in combination with a downhole directional control unit, both depend on the flowing circulation liquid. Upon directional changes, the bit has to be released while the angle of the bit is altered.
The use of a downhole pump does not improve the condition, but may give a better flexibility and independence when several tools are used simultaneously.
SUMMARY OF THE INVENTION
The object of the invention is to provide an improved device for transferring energy and control signals for operating downhole hydraulic tools in connection with coil tubing operations.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
An example of an embodiment of the invention is described in the following, reference being made to the attached drawings, wherein:
FIG. 1 shows in top plan view, partly in section, a drum having a coil tubing coiled thereon and within which an electrical cable and two hydraulic pipes extend;
FIG. 2 shows the same drum as in FIG. 1 as shown in an end view;
FIG. 3 shows in section and side elevational view, as well as on a larger scale, a coil tubing surrounding an electrical cable and hydraulic pipes;
FIG. 4 shows in section and side elevational view the end of the coil tubing having a hydraulic connection device for connecting downhole equipment.
DETAILED DESCRIPTION OF THE INVENTION
In FIG. 1, reference numeral 1 denotes a drum comprising a shaft 2, side walls 4, 6 and a tubular drum core 8 on which a coil tubing 10 has been coiled up. Into the coil tubing 10, two pipes 12, 14 for hydraulic liquid as well as an electrical cable 16 have been threaded. The coil tubing 10 is adapted to conduct circulation liquid delivered from a pump device, not shown, through a supply pipe 18 and further through a first swivel device 20 of a type known, mounted at one end of the shaft 2, the coil tubing 10 being connected to the outlet of the swivel device 20. As known, the swivel device 20 is adapted to fort a pressure-tight rotary connection between the stationary supply pipe 18 and the coil tubing 10 following the rotational movements of the drum 1.
The hydraulic pipes 12, 14 extending within the coil tubing 10 have been passed into the coil tubing 10 through a pressure-tight passage 22 placed downstream in relation to the swivel device 20. Through a second swivel device 24 disposed at the other end of the shaft 2, the hydraulic pipes 12, 14 are by means of hydraulic pipes 26, 28 connected to a hydraulic aggregate, not shown. As known, the swivel device 24 is adapted to form pressure-tight rotary connection between the stationary liquid-carrying pipelines 26, 28 and the hydraulic pipes 12, 14, the latter following the rotational movements of the drum 1.
The electrical cable 16 which may contain one or mare conductors is, in a manner similar to the hydraulic pipes 12, 14, passed into the coil tubing 10 through a pressure-tight passage 30. Further, the electrical cable 16 is passed through the second swivel device 24 to a third swivel device 32 which, as known, is adapted to transfer electrical signals to an electrical cable 34 connected to electrical equipment, not shown.
By me
REFERENCES:
patent: 4661660 (1987-04-01), von Sothen et al.
patent: 4673035 (1987-06-01), Gipson
patent: 4685516 (1987-08-01), Smith et al.
patent: 4743175 (1988-05-01), Gilmore
patent: 4862958 (1989-09-01), Pringle
patent: 5179972 (1993-01-01), Eley
patent: 5275198 (1994-01-01), Vollweiler et al.
Bagnell David J.
Transocean ASA
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