최소 단어 이상 선택하여야 합니다.
최대 10 단어까지만 선택 가능합니다.
다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
NTIS 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
DataON 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Edison 바로가기다음과 같은 기능을 한번의 로그인으로 사용 할 수 있습니다.
Kafe 바로가기국가/구분 | United States(US) Patent 등록 |
---|---|
국제특허분류(IPC7판) |
|
출원번호 | US-0505623 (1983-06-20) |
발명자 / 주소 |
|
출원인 / 주소 |
|
인용정보 | 피인용 횟수 : 277 인용 특허 : 2 |
An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero potential difference between pairs of monitoring e
An induced polarization tool using focused electrodes that uses direct coupling in the focusing loop to prevent spurious phase shifts. The invention uses a differential-in differential-out amplifier and voltage-controlled resistances to provide zero potential difference between pairs of monitoring electrodes. The measured current and voltage are digitized downhole and transmitted to the surface. At the surface means are provided for determining in-phase and quadrature response.
An induced polarization logging tool for measuring parameters of a formation surrounding a borehole, said logging tool comprising: a non-conductive logging sonde; a plurality of electrodes disposed on said sonde, said electrodes including at least a survey current electrode and guard electrodes disp
An induced polarization logging tool for measuring parameters of a formation surrounding a borehole, said logging tool comprising: a non-conductive logging sonde; a plurality of electrodes disposed on said sonde, said electrodes including at least a survey current electrode and guard electrodes disposed on opposite sides of said survey current electrode, a non-polarizing voltage measuring electrode, a non-polarizing voltage reference electrode and a current return electrode, both said voltage reference and current return electrodes being located a greater distance from said survey current electrode than said guard electrodes; means connected to said survey current electrode and said guard electrodes for generating a signal representative of the potential difference in the formation between said survey current electrode and said guard electrodes; first control means directly coupled to said survey current electrode, said first control means controlling the current flow to said survey current electrode in response to said potential difference signal; a second control means directly coupled to said guard electrodes to control the current flow to said guard electrodes in response to said potential difference signal; a source of alternating current located at the surface, one end of said source being coupled to the two control means and the other to the current return electrode, said source supplying alternating current at various discrete frequencies between substantially 0.01 and 100 Hz; measurement means directly coupled to said voltage measurement and survey current electrodes to measure the amplitude and phase of the voltage induced in the formation and the amplitude and phase of the current flow to the survey current electrode; and transmission means for transmitting said measurements to the surface.
Copyright KISTI. All Rights Reserved.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.