Method and apparatus for exploring earth and rocky formations

Details Method and apparatus for exploring earth and rocky formations Method and apparatus for exploring earth and rocky formations

1980-10-06

1984-07-03

Wilbur, Maynard R.

Communications: electrical

Wellbore telemetering or control

Selective control of subsurface equipment

367 35, 166250, 73151, 73155, 181105, E21B 4100

Patent

active

044582455

ABSTRACT:
The length and width of fissures in a bore hole is determined by alternately flowing liquid into and out of the formation from an isolated zone of a bore hole, at different frequencies, and measuring the dynamic pressure of the flowing fluid. The length of fissures in the isolated zone is determined from frequency peaks at high pressure to flow ratios, and the thickness of the fissures is determined from variations of pressure-flow ratios with frequency by comparison with known data. Sonde apparatus for practicing the method is also disclosed.

REFERENCES:
patent: 3602308 (1971-08-01), Vincent
patent: 3718205 (1973-02-01), Fair et al.
patent: 4044828 (1977-08-01), Jones et al.
"Analysis of Short-Time, Transient Test Data by Type-Curve Matching", Earlougher, Jr. et al., Journal of Petroleum Technology, vol. 26, Jul. 1974, pp. 793-800.

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