Borehole stress property measuring system

Details Borehole stress property measuring system Borehole stress property measuring system

1977-11-14

1979-04-17

Myracle, Jerry W.

Measuring and testing

Borehole or drilling

Downhole test

E21B 4900

Patent

active

041494091

ABSTRACT:
A borehole stress property measuring system for in situ determination of stress states as well as material properties of soil and rock media includes two axially aligned adjacent cylindrical members disposed in a borehole. One cylindrical member is provided with at least four pair of diametrically opposed pistons which are hydraulically actuated to impinge on the borehole wall under various pressure loading conditions. The pairs of pistons are axially spaced and angularly offset, each from the other, so that accurate measurement of the outward extension of the pistons under various pressure loading conditions reveals such material properties as elasticity, isotropy, compressibility, and the like. The second cylindrical member includes expandable four-quadrant pressurizing chambers to apply differential pressure to and simultaneously measure deformation of the borehole boundary for determining the existing stress conditions in the underground media.

REFERENCES:
patent: 2957341 (1960-10-01), Menard
patent: 3872717 (1975-03-01), Fox

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