Methods for estimating the CCS to a rock in the depth of the cutting zone of a formau00c7u00e7o underground, to calculate (delta) PP in a rock due to the perfurau00c7u00e7o differential pressures, and to calculate corrected through a rock in the depth of the cutting area

摘要

Methods for estimating the CCS to a rock in the depth of the cutting zone of a formau00c7u00e7o underground, to calculate the app on a rock due to the perfurau00c7u00e7o differential pressures, and to calculate corrected through a rock in the depth of the cutting zone.And revealed a method to estimate the CCS to a rock in the depth of the cutting zone of an underground formation to be perforated using a drilling fluid. A location is determined for a rock in the depth of the cutting zone. A change in the resistance of the rock due to tens5es applied imposed on the rock during drilling is calculated, including estimating the app.The CCS for the rock in the depth of the cutting area is calculated by adding the estimated change in resistance to the UCS. The present invention calculates the app according to the theory of Skempton, where impermeable rock or soil has a change in pore volume due to the applied loads or stresses while fluid flow inside / outside the rock or soil is substantially non - existent.CCS can be calculated for holes of shaft diverted and take into account factors as a profile hole of shaft, elevations of tensions, the diameter of the hole, and the weight of mud by using correction factors derived using computer modeling and using a baseline for certain formula The air a value not adjusted for CCS.