Abstract: A method for estimating a depth pressure and/or permeability profile of a geological formation having a well extending between a first end and a second end includes equipping the well with an inner tube defining an inner space and an annular space; performing a first well closing phase by injecting a second fluid having a higher viscosity than a first fluid in the well while extracting under a first constant pressure value; performing a second well closing phase by injecting the second fluid while extracting the first fluid under a second constant pressure value, different from the first constant pressure value; and estimating the depth pressure and/or permeability profile of the geological formation based on measurements performed during the first well closing phase and the second well closing phase.

Abstract: A method for estimating an injection profile in function of the depth of a well include performing, when the well is initially filled with an initial fluid: a well closing phase wherein a first fluid is injected at a first end of the well until said first fluid reaches a second end of the well, said first fluid having a higher viscosity than the initial fluid; and a well opening phase wherein a second fluid is injected at the first end until said second fluid reaches the second end, said first fluid having a higher viscosity than the second fluid. The method further comprises measuring at least one temporal injection profile and estimating the depth injection profile of the well based on the at least one temporal injection profile.

Abstract: A well passing through a geological formation is fitted with a tube, open at its bottom end, that is filled with a fluid. Another fluid is in the annular space between the tube and the wall of the well, the two fluids exhibiting an interface situated in the annular space. A hydraulic balance of the fluids of the well is disturbed and the trend of certain quantities is measured. These measurements are moreover simulated by computer by using different sets of values for the physical parameters, and efforts are made to estimate the geological formation. A comparison of the measurements with the simulation results makes it possible to identify an optimum set of values for the parameters.

Abstract: A well passing through a geological formation is fitted with a tube, open at its bottom end, that is filled with a fluid. Another fluid is in the annular space between the tube and the wall of the well, the two fluids exhibiting an interface situated in the annular space. A hydraulic balance of the fluids of the well is disturbed and the trend of certain quantities is measured. These measurements are moreover simulated by computer by using different sets of values for the physical parameters, and efforts are made to estimate the geological formation. A comparison of the measurements with the simulation results makes it possible to identify an optimum set of values for the parameters.

Abstract: The method comprising measuring the rate at which working fluid is expelled from a cavity through a central tubing to a well head under atmospheric pressure at the well head; determining the shape of a zone of the well selected for positioning an interface between a test fluid and the working fluid; performing temperature measurements and pressure measurements over the full height of a cavity under atmospheric pressure at the well head; injecting additional working fluid into the central tubing or into the annular space until a predetermined test pressure is reached; measuring the compressibility of a cavity during the preceding step; injecting test fluid into the annular; measuring the depth of the interface between the test fluid and the working fluid for a first time at the end of injecting test fluid; measuring the test fluid and the working fluid pressures at the well head; measuring the level of the interface between the test fluid and the working fluid for a second time; and evaluating the real leakage