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Device of measuring formation resistivity of drill

A technology of formation resistivity and drill bits, which is applied in the fields of electrical/magnetic detection for well logging records, earthwork drilling, and electromagnetic wave detection, etc., can solve problems such as measurement lag, achieve measurement lag and improve practicability Effect

Active Publication Date: 2014-02-19
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a device for measuring the formation resistivity at the drill bit to solve the problem of measurement lag caused by the distance between the drill bit and the traditional propagation resistivity logging tool in the related art

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  • Device of measuring formation resistivity of drill
  • Device of measuring formation resistivity of drill
  • Device of measuring formation resistivity of drill

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Embodiment Construction

[0032] Hereinafter, the present invention will be described in detail with reference to the drawings and examples. It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0033] The embodiment of the present invention also provides a device for measuring the formation resistivity at the drill bit, including:

[0034] a tool housing;

[0035] a transmitter configured on the tool housing;

[0036] a receiver arranged on the tool housing at an axial distance from the transmitter;

[0037] A transmit signal coupler, coupled with the transmitter and receiver antennas.

[0038] The above-mentioned transmitter generates an electrical signal, which is converted by an antenna on the transmitter into an electromagnetic signal to be transmitted into the formation. The receiver measures the amplitude and phase of the electromagnetic signal in the formation. The transmit sign...

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Abstract

The invention discloses a device of measuring formation resistivity of a drill. The device comprises a tool housing; an emitter disposed on the tool housing and used for generating electric signals and converting the electric signals into electromagnetic signals to be emitted to a formation; a receiver arranged on the tool housing, positioned at an axial place of the emitter and used for measuring amplitude and phase of the electromagnetic signals from the emitter; and an emission signal coupler coupled to the emitter and used for coupling part of electric signals of an antenna of the emitter and measuring amplitude and phase of the coupled electric signals. An amplitude and phase difference between the electromagnetic signals received by the receiver and the electric signals coupled by the emission signal coupler is utilized to calculate resistivity. The device of the invention helps to solve problems of measurement lag caused by a distance between a drill and a conventional propagation logging tool. The device is improved to be more practical.

Description

technical field [0001] The invention relates to the field of resistivity logging, in particular to a device for measuring formation resistivity at a drill bit. Background technique [0002] Gathering downhole information typically uses electrical measurement methods such as logging while drilling (“LWD”), measurement while drilling (“MWD”), and wireline logging systems. Well known in the oil industry, these techniques have long been used to obtain downhole information, for example, using formation resistivity (or conductivity; the terms "resistivity" and "conductivity", although opposite in meaning, are used interchangeably in the art) And various petrophysical models (such as Archie's law) can be used to determine the petrophysical properties of formations and corresponding fluids. In related technologies, resistivity is an important parameter reflecting the oil and gas (such as crude oil or natural gas) and water content in porous formations, so it is best to keep the wel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B49/00
CPCG01V3/28G01V3/12
Inventor 刘乃震赵齐辉卢毓周李永和白锐刘策李敬乔建国
Owner BC P INC CHINA NAT PETROLEUM CORP
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