Telemetry method for cable-drilled boreholes and method for carrying it out
AssigneesBergwerksverband GmbH, Ruhrkohle Aktiengesellschaft
InventorsUdo Dickel, Helmut Palm, Clemens Hinz
Life of this patent
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Abstract
A telemetry system for obtaining loggings by an independently guiding logging probe provided with a sensor includes the logging probe ejected in a drill string, so that the sensor projecting through a drill bit of the drill string has an access to the bottom and walls of the drill bore, a pick-up probe injectable into the drill string to form a wireless connection with the logging probe and connected to a portable computer which initializes the logging probe, loggings stored in the logging probe are readable from the portable computer upon recovering the logging probe from the bore string.
Claims10
A telemetry method for cable-drilled boreholes, said method comprising the steps of:
- (a) injecting an independently functioning logging probe along a drill string removable from a drill bore, said logging probe including a core-tube coupling and a logging sensor;
- (b) arresting said logging probe at a drill bit of the drill string so that said logging sensor projects through an aperture of the drill bit to have a free access to the bottom and walls of the drill bore;
- (c) thereafter injecting a pick-up probe on a logging cable connected to a portable computer into said drill string to form a wireless connection between said probes, and initializing the logging probe by the personal computer, said computer and logging probe being synchronized upon initializing;
- (d) taking and temporarily storing loggings from said logging probe with said personal computer;
- (e) drawing said pickup probe out of the drill bore;
- (f) thereafter recovering the logging probe with an inner tube grab;
- and
- (g) reading out the loggings from the portable computer.
A telemetry method for cable-drilled boreholes, said method comprising the steps of:
- (a) injecting an independently functioning gyroscopic probe along a drill string removable from a drill bore, the gyroscopic probe including a logging sensor;
- (b) arresting said gyroscopic probe at a drill bit of the drill string so that the logging sensor projects through an aperture of the drill bit to have a free access to the bottom and walls of the bore;
- (c) connecting the gyroscopic probe with a borehole-logging cable directly connected with a portable computer and initializing said gyroscopic probe, said personal computer and the logging probe being synchronized upon initializing;
- (d) temporary storing in and taking from the gyroscopic probe the loggings with the personal computer;
- (e) thereafter recovering the gyroscopic probe;
- and
- (f) reading out the loggings by the portable computer.
An apparatus for carrying out the telemetry method, comprising:
- means including a logging string and a drill bit for forming a borehole, said drill bit defining a lower end of the bore string and having an aperture in a trailing end;
- a logging probe injectable along said string and including:
- means on a leading end of said probe for arresting the logging probe at said drill bit and provided,
- sensing means protrudable through said aperture of said drill bit for taking loggings in the borehole,
- means for energizing said sensing means;
- logging processing means for processing information obtained by said sensing means,
- storing means for temporary storing said information, and
- inner-tube head on a rear end of said probe housing a soft-magnet core surrounded by a first induction coil;
- a displaceable logging-cable head formed with a pickup probe having a second a coil wirelessly engaging the first coil;
- a portable computer provided with data processing means for reading out said information stored in said logging probe;
- and
- a borehole cable connecting said logging-cable head and portable computer, said computer being a data-pickup device including a data memory, and a serial data transmitter, said data-pickup device being synchronized with and initializing said logging probe upon the wireless contact between said pickup and logging probes.
Dependencies are inferred from the claim text.