发明名称 |
Use of magneto-resistive sensors for borehole logging |
摘要 |
A downhole caliper instrument utilizing a linear or arcuate magneto resistive sensor to determine the position of one or more caliper arms which extend from a carrier tool to touch the surface of a borehole wall. A processor and firmware are included to calculate and plot the borehole radius. A plurality of magneto resistive sensors are provided to calculate the sine, cosine and tangent for accurate motion of each independent arm. The magneto resistive sensors sense the position a precise magnetic ruler linked to the caliper arm. The position of the caliper arm determines the radius of the borehole. Calculation of Radius/Diameter is preferably performed in the computer on surface. The downhole controller's firmware controls the multiplexer switching, A/D conversion and other functions. |
申请公布号 |
GB2376079(B) |
申请公布日期 |
2004.09.01 |
申请号 |
GB20020014982 |
申请日期 |
2001.10.30 |
申请人 |
* BAKER HUGHES INCORPORATED |
发明人 |
HELMUT * LECHEN |
分类号 |
E21B47/08;G01B7/13;(IPC1-7):G01B7/13 |
主分类号 |
E21B47/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|