Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent
1993-08-20
1995-09-05
Schoeppel, Roger J.
Wells
Processes
Operating valve, closure, or changeable restrictor in a well
166 651, 166 67, E21B 3410
Patent
active
054472016
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a well completion system and is concerned with the provision of such a system incorporating features providing enhanced production from the well.
The invention accordingly provides a well completion system comprising at least one downhole completion assembly for receiving fluid from a reservoir, selectively adjustable flow control means in the completion assembly, and a fluid flow booster downstream of the completion assembly, whereby the fluid extraction rate can be optimised.
The system can include a plurality of completion assemblies in series, each incorporating a respective flow control means, typically a choke device, for individual adjustment of fluid inflow from respective reservoirs associated with the completion assemblies or from a single reservoir at spaced intervals at which the assemblies are located. The extracted fluid can comprise liquid or gas or a mixture of the two, and a submersible pump or a compressor is selected as the flow or production booster accordingly.
The production booster functions to expose the reservoir or reservoirs to a higher drawdown pressure differential than is available from the natural reservoir drive, thereby providing artificial lift. A single production booster can be operated in conjunction with a plurality of completion assemblies which can be individually tuned to a drawdown appropriate to the respective associated reservoirs or reservoir intervals, the adjustments being within a pressure range corresponding to the differential provided by the booster.
The invention thus also provides a completion assembly for a well completion system comprising tubing for receiving well effluent and for guiding the received well effluent through a variable choke device, together with control means for varying the choke device flow aperture. The choke device is preferably operable to close off the effluent flow completely.
Such a completion assembly can be employed in various forms of well completion system and the control means can be operated in response to sensed local conditions or in the context of overall system management in a system incorporating plural completion assemblies.
The invention also provides a well completion system comprising a plurality of completion assemblies each having a selectively variable choke device, wellhead equipment including a well testing facility, and control means for operating the choke devices so as to permit testing at the wellhead of individual wells, or of individual production intervals of a single well.
The wellhead equipment can thus include a test loop with metering facilities. Where the system comprises plural wells tied back to common flowlines, individual wells can be tested without interruption to production from other wells. The system can but need not include a production booster downstream of the completion assemblies, so as to provide for optimised production as described above.
The invention also provides a well completion system comprising a plurality of downhole equipment units on a common core or spine constituted by electrical and/or fluid supply means. The supply means can be constructed as power tubing extending centrally along the production tubing of the system.
The power tubing preferably includes plural conductors for the transmission of electric power and also control signals downhole from the wellhead. The conductors also transmit test and monitoring signals from the downhole equipment up to data acquisition and treatment equipment at the wellhead. Multiplexing can be employed. The power tubing also preferably incorporates fluid passage means extending between the wellhead and the downhole equipment. Plural conduits can be provided for conveying or circulating for example barrier fluid for providing overpressure protection, hydraulic fluid for operation of downhole equipment, as by way of local power units, and for the supply of chemical additives or inhibitors to be injected into the production fluid. Each unit of the downhole equipment accordingly has its respective electrical and/
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Framo Developments (UK) Limited
Schoeppel Roger J.
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