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Wireless telemetry systems for downhole tools

a technology of telemetry system and downhole tool, which is applied in the field of telemetry system, can solve the problems of difficult to provide such communication using a cable, the cable inside the tubing is also an additional complexity, and the operator does not obtain direct feedback from the downhole tool

Inactive Publication Date: 2011-08-25
SCHLUMBERGER TECH CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]A first aspect of this invention provides apparatus for transmitting data in a borehole between a downhole installation including one or more tools (for example downhole testing tools) and ...

Problems solved by technology

One of the more difficult problems associated with any borehole is to communicate measured data between one or more locations down a borehole and the surface, or between downhole locations themselves.
Similarly when operating some of the downhole testing tools from surface, such as tester valves, circulating valves, packer, samplers or perforating charges, the operators do not obtain a direct feedback from the downhole tools.
However, it can be difficult to provide such communication using a cable since inside the tubing string it limits the flow diameter and requires complex structures to pass the cable from the inside to the outside of the tubing.
A cable inside the tubing is also an additional complexity in case of emergency disconnect for an offshore platform.
Space outside the tubing is limited and a cable can easily be damaged.

Method used

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  • Wireless telemetry systems for downhole tools
  • Wireless telemetry systems for downhole tools
  • Wireless telemetry systems for downhole tools

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Embodiment Construction

[0038]The present invention is particularly applicable to testing installations such as are used in oil and gas wells or the like. FIG. 1 shows a schematic view of such a system. Once the well has been drilled through a formation, the drill string can be used to perform tests, and determine various properties of the formation though which the well has been drilled. In the example of FIG. 1, the well 10 has been lined with a steel casing 12 (cased hole) in the conventional manner, although similar systems can be used in unlined (open hole) environments. In order to test the formations, it is preferable to place testing apparatus in the well close to the regions to be tested, to be able to isolate sections or intervals of the well, and to convey fluids from the regions of interest to the surface. This is commonly done using a jointed tubular drill pipe, drill string, production tubing, or the like (collectively, tubing 14) which extends from the well-head equipment 16 at the surface (...

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Abstract

Apparatus and method for transmitting data in a borehole (10) between a downhole installation including one or more tools (20) (for example downhole testing tools) and a surface installation (62), wherein the downhole installation is connected to the surface installation by means of a tubular conduit (such as a drill string or production tubing 14)). The apparatus comprises: an acoustic modem (26) associated with each tool, the modem acting to convert tool signals such as electrical tool signals into acoustic signals; and a hub (90) forming part of the downhole installation to which the tools and tubular conduit are connected and comprising an acoustic receiver (74) and an electromagnetic transmitter (80). The acoustic modems operate to generate acoustic signals in the downhole installation representative of the tool signals, the acoustic signals passing along the downhole installation to be received at the acoustic receiver of the hub, the received acoustic signals being used to operate the electromagnetic transmitter to transmit electromagnetic signals to the surface for reception at the surface installation.

Description

CROSS-REFERENCE TO RELATED APPLICATION [0001]The present application is based on and claims priority to European Patent Application No. EP08162854, filed Aug. 22, 2008.TECHNICAL FIELD [0002]The present invention relates to telemetry systems for use with installations in oil and gas wells or the like. In particular, the present invention relates to wireless telemetry systems for transmitting data and control signals between a location down a borehole and the surface, or between downhole locations themselves.BACKGROUND ART [0003]One of the more difficult problems associated with any borehole is to communicate measured data between one or more locations down a borehole and the surface, or between downhole locations themselves. For example, in the oil and gas industry it is desirable to communicate data generated downhole to the surface during operations such as drilling, perforating, fracturing, and drill stem or well testing; and during production operations such as reservoir evaluati...

Claims

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Application Information

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IPC IPC(8): E21B47/16E21B47/12
CPCE21B47/16E21B47/122E21B47/13
Inventor LEMENAGER, ERWANN
Owner SCHLUMBERGER TECH CORP
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