METHOD FOR ESTIMATING A PORE PRESSURE VALUE IN GEOLOGICAL FORMATIONS TO BE DRILLED BY A DRILLING APPARATUS

摘要

A method for estimating an anomalous pore pressure value at depth level of a first discontinuous interface (24, 210) between a first geological formation and a second geological formation to be drilled by a drilling bit (10), by means of a system (100) comprising at least one electro-acoustic transducer (20) mounted with said bit (30), at least one memory (32, 33) for containing observable data and at least one control processor (30, 31) for processing observable data contained in said at least one memory (32, 33), where said at least one processor (30, 31) controls transmitting a signal transmitted at a given frequency, said at least one electro-acoustic transducer (20) receives a received signal that said at least one processor (30, 31) records in said at least one memory (32, 33), comparing it with pre- loaded observable data in said at least one memory.