METHOD OF DIAGNOSTICS AND QUANTITATIVE ESTIMATION OF NON-PRODUCTIVE INJECTION IN INJECTION WELLS WITH UNSTABLE CRACKS OF AUTO-HF Russian patent published in 2020 - IPC E21B47/10 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil production and can be used for carrying out, interpretation and analysis of results of field-geophysical and hydrodynamic investigations in injection wells with the purpose of further justification of measures for prevention and elimination of inefficient pumping. Method for evaluation of non-productive pumping in injection well includes pumping of working fluid into injection well with implementation of auto-HF, determination of working fluid flow rate (Q_PSC). Further stopping of injection well, recording of pressure drop curve (PDC) and determination of apparent conductivity of perforated formations (kh'_PDC) on the basis of working fluid flow rate (Q_PSC) determined at the previous stage and efficiency. Subsequent injection of working fluid into injection well at pressure at which auto-hydraulic fracture is closed, recording the pressure stabilization curve (PSC^*), determining the flow rate of the working fluid (Q_PSC^*), estimating the true conductivity of the perforated formations (kh_PSC^*) based on the PSC^* diffraction pattern and the flow rate of the working liquid (Q_PSC^*). Determination of flow rate of working fluid (Q₁) supplied during pumping into perforated formations, based on Q_PSC, kh_PSC^* and kh'_PDC; determining the flow rate of working fluid (Q₂) of non-productive injection based on Q₁ and Q_PSC.

EFFECT: technical result of the invention is increase of accuracy of definition of non-efficient injection of the injection well, in particular, in case of connection of a crack of additional not opened with perforation of thicknesses without dependence from their energy condition (pressure in a formation).

21 cl, 4 dwg