EP0539240A2
Expired / Lapsed
EP
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Measurement-while-drilling system
Assignee: Akishima Laboratories Mitsui Zosen Inc
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Filing: 1992-10-26
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Granted: —
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Expires: 2012-10-26
Abstract
Abstract A bottom-hole information collecting equipment to collect data at the bottom part of the shaft in real time by means of the sonde throughout an excavation by the bit for digging. The sonde is provided to be mechanically and electronically connected to or separated from the connecting pipe to which the bite is attached arbitrarily. Data collected by several sensors near the bit is transmitted to the sonde via the electromagnetic coupler. The electricity for the sensors and the sonde can be obtained by respective generators of which one is in the sonde and the other is in the connecting pipe. <IMAGE>
Inventors
- 👤 Hajime C/O Akishima Lab. Yuasa (Mitsui Zosen)Inc
- 👤 Kazuho C/O Akishima Lab. Hosono (Mitsui Zosen)Inc
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 16:09
CPC Classifications
E; E21; E21B; E21B47/00; E21B47/01; E21B47/12; E21B47/13
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
87 words
A bottom-hole information collecting equipment to collect data at the bottom of a shaft dug by an excavating equipment with spouting out the muddy water from a bit attached to a forwarded end of digging pipes, said bottom-hole information collecting equipment comprises: a sonde mechanically connected to or separated from one digging pipe; more than one sensor provided in the other digging pipe, each sensor being to collect the data at the bottom of the shaft; and a coupler capable of connecting said sonde with said sensors.
Claim 2
Dependent Claim
26 words
A bottom-hole information collecting equipment according to claim 1, wherein said sonde has a centralizer to be aligned to a central axis of the digging pipes.
Claim 3
Dependent Claim
27 words
A bottom-hole information collecting equipment according to claim 2, wherein said centralizer is formed out of the four plate springs along the length direction of the sonde.
Claim 4
Dependent Claim
28 words
A bottom-hole information collecting equipment according to claim 1, wherein said sonde further comprises a hook at the tail part thereof to be taken out to the ground.
Claim 5
Dependent Claim
30 words
A bottom-hole information collecting equipment according to claim 1, wherein said sonde includes a pulse valve to change a current pressure of the muddy water fed into the digging pipes.
Claim 6
Dependent Claim
49 words
A bottom-hole information collecting equipment according to claim 1, wherein said sonde includes a generator inside of the head part thereof, the generator being driven by a turbine blade which is provided in a digging pipe for said sensors and is capable of being rotated by the muddy water.
Claim 7
Dependent Claim
34 words
A bottom-hole information collecting equipment according to claim 6, wherein said sensors are connected to other generator, the other generator being capable of being driven by another turbine blade rotated by the muddy water.
Claim 8
Dependent Claim
32 words
A bottom-hole information collecting equipment according to claim 1, wherein said coupler is structured with a primary coil provided in the other digging pipe and a secondary coil provided at said sonde.
Claim 9
Dependent Claim
17 words
A bottom-hole information collecting equipment according to claim 8, wherein the secondary coil is capable to rotate.
Claim 10
Dependent Claim
81 words
A bottom-hole information collecting equipment according to claim 8, wherein the primary coil previously has a signal processing portion to convert respective analog signals issued from said sensors into digital signals and a multiplexing portion to multiplying the digital signals and subsequently putting the signals on a carrier with high frequency, and wherein the secondary coil behind has a signal resolving portion to resolve multiplexed signals into data signals and an inverter portion to make digital signals into analog signals again.
Claim 11
Dependent Claim
22 words
A bottom-hole information collecting equipment according to claim 8, wherein said both coil are sealed not to directly contact to each other,
References Cited (Backward Citations)
No citation records indexed.
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