Boring or penetrating the earth – With signaling – indicating – testing or measuring
Patent
1994-07-25
1996-10-01
Bagnell, David J.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
166 64, 1662542, 166385, F21B 4702, E21B 4712
Patent
active
055604374
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a national phase of PCT/EP92/02043 filed Sep. 4, 1992 and based, in turn, on German national application P4129709.1 filed Sep. 6, 1991 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a telemetry method for cable-drilled boreholes as well as an apparatus for carrying out the method.
BACKGROUND OF THE INVENTION
The publication "Horizontal Well Logging by `Symphor` (Eighth European Formation Evaluation Symposium, London, 1983) describes a borehole-logging method and the corresponding apparatus particularly directed at logging horizontal or slant boreholes by a logging probe on the end of the drill string and a logging cable extending between the drill string and logging cart on the surface and movable by a cable winch. The logging probe comprises a massive rod mechanically and electrically connected with the cable shoe and to which a coupling rod is connected which is connected behind the logging tools. The probe furthermore has a coupling housing for connection to the drill string and a protective housing for the logging tools and having an aperture. With this telemetry method and with the corresponding apparatus there is the disadvantage that the logging probe is fixed on the drill string so that the drill string must be taken apart before every logging in order to take the bit off the lower end of the drill string and to install the logging probe there.
Furthermore from "Efficiently log and perforate 60.degree.+ wells with coiled tubing" (World Oil, July 1987, pp. 32, 33, and 35) a method and a telemetry apparatus are known wherein instead of the drill string a special windable hose is used with a special hose winch and on whose end a logging probe, for example a gamma-ray probe, is connected as a locating probe for casing joints or as an acoustic sound for checking the annular cement joints between the casing and the surrounding rock. With this telemetry method and the apparatus for carrying it out it is possible to do a quick check of such bores after the derrick has been removed. On the other hand it is disadvantageous that one must use a special winch and a special hose string in order to make the necessary loggings.
OBJECTS OF THE INVENTION
It is an object of the invention to provide an improved telemetry method for cable-drilled boreholes. wherein the logging probe can be changed without dismantling the drill string. Yet another object of the invention is to provide an apparatus for carrying out the method according to the invention.
SUMMARY OF THE INVENTION
Still another object is to provide a telemetry method.
The telemetry method according to the invention for cable-drilled boreholes and the corresponding apparatus are ideal for geophysical loggings of strongly inclined bores. With this new telemetry concept, which is based on the method according to the invention having the step of independently functioning logging probe which is jetted into the drill string and projecting sensors forwardly out of the drill bit, there is no necessity to dismantle the drill string so that the effort and time necessary for making the loggings can be substantially reduced. During the logging procedure itself there is no need for a cable connection so that no expensive side apertures in the drill string are necessary. Since the logging probe is mounted inside the string, there is no way to lose it.
Even when the logging probe is switched it is no longer necessary to dismantle the string completely since each logging probe, similar to a solid core tube, can be taken rapidly by means of the core-tube grab out of the drill string whereupon with equal speed a new logging probe can be jetted into place. Use of the method of the invention eliminates problems when making the loggings because one can make loggings immediately after drilling without having to pull out the drill string. The outside diameter of the logging probe corresponds to that of a cable tube and can be easily secured via the inner-tube head to the
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Dickel Udo
Hinz Clemens
Palm Helmut
Bagnell David J.
Bergwerksverband GmbH
Dubno Herbert
Ruhrkohle Aktiengesellschaft
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