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Downhole penetrometer

  • US 5,165,274 A
  • Filed: 12/04/1991
  • Issued: 11/24/1992
  • Est. Priority Date: 12/11/1990
  • Status: Expired due to Term
First Claim
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1. A downhole penetrometer for making earth stress measurements comprising a tool body which can be lowered into a borehole and comprising:

  • a) fluid pressure operated actuator means,b) a tooth member connected to said actuator means so as to be moveable radially outwardly from said body so as to penetrate a wall of the borehole,c) sensing means for determining the force applied to said tooth member by said actuator means,d) sensing means for determining the amount of movement of said tooth member,e) pumping means to supply pressurised fluid to said actuator means, andf) means for isolating a region of the borehole in which measurements are to be made from the remainder of the boreholesaid tooth member being moveable so as to penetrate the wall of the borehole, and said sensing means together determining the extent of penetration of the tooth member into the wall of the borehole.

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