发明名称 |
Oil based mud imaging tool with common mode voltage compensation |
摘要 |
An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an oscillatory electric field in a borehole wall. A voltage drop across a segment of the borehole wall is measured by two voltage electrodes, and the differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole wall. A common mode voltage in front of the two voltage electrodes is measured and minimized by controlling the excitation source, thereby reducing the resistivity measurement error. |
申请公布号 |
US8212568(B2) |
申请公布日期 |
2012.07.03 |
申请号 |
US20100758276 |
申请日期 |
2010.04.12 |
申请人 |
MORYS MARIAN L.;SCHAECHER WILLIAM J.;GOODMAN GEORGE D.;PAI RAJ;HALLIBURTON ENERGY SERVICES, INC. |
发明人 |
MORYS MARIAN L.;SCHAECHER WILLIAM J.;GOODMAN GEORGE D.;PAI RAJ |
分类号 |
G01V3/18;G01V3/20 |
主分类号 |
G01V3/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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