METHOD FOR DETERMINING FILTRATION PARAMETERS OF BOTTOM-HOLE FORMATION ZONE AND DETECTION OF DEFECTS IN WELL DESIGN Russian patent published in 2012 - IPC E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: field hydrodynamic researches of wells are performed. And namely, hydrodynamic pressure disturbance is performed in the formation under investigation by means of periodic or non-periodic time history of well flow rate; time dependences of flow rate and pressure are recorded. At that, pressure and flow rate is measured on the well head; pressure is measured simultaneously in tubing strings and in tubular annulus. Frequency dependences of ratio of pressure amplitude to flow rate and phase shift between them are obtained. Calculation of ratio of amplitudes and phase shift of components of frequency spectrum (harmonics) of pressure to flow rate, which are corrected to the well bottom, i.e. complex impedance of bottom-hole zone, is made. According to the formulae obtained from representation of design volumes of the well by the wiring scheme including two series coaxial lines and concentrated capacity at their connection point, for the appropriate pressure measurement points, for calculation of filtration parameters of the formation for the used non-periodic type of action from frequency dependence of impedance there used is time dependence of pressure or flow rate, which are corrected to the well bottom. As per the sufficient difference of values of complex impedance of bottom-hole zone, which are calculated as per pressure data, the conclusion is made on availability of disturbances of hydrodynamic integrity of the well design at the points located at some distance from the working face.

EFFECT: improving calculation accuracy of filtration parameters of formation, saving of time and costs for performance of field researches; possibility of detecting disturbances in the well design.

2 cl, 6 dwg