METHOD AND DEVICE TO ESTIMATE PHYSICAL UNDERGROUND BEDDING PARAMETERS BY TAKING DRILL FINES SAMPLE Russian patent published in 2006 - IPC E21B49/00 G01N15/08 E21C39/00 

FIELD: testing the nature of borehole walls, particularly to estimate rock permeability.

SUBSTANCE: method involves taking rock samples from underground bedding zone; immersing the samples into highly-viscous liquid loaded in sealed chamber, wherein above liquid is pumped in above chamber under pressure increasing in time to predetermined threshold pressure value to compress gas present in rock pores; stopping liquid pumping to relax thereof, wherein pumping and relaxation operations are carried out along with measuring chamber pressure; modeling above pressure changing processes with the use of processing system on the base of initial values taken as physical parameters of rock fragments; iteratively setting the values of above physical parameters by iteratively bringing the modeled pressure change to that measured in the chamber. The rock fragments may be obtained as drill fines lifted by drilling sludge or as drill fines obtained after prior flushing thereof. Pump, which supplies water at constant rate in buffer reservoir filled with highly-viscous oil may be used for above liquid pumping.

EFFECT: increased accuracy of physical parameter estimation.

5 cl, 11 dwg