METHOD OF HYDRODYNAMIC INVESTIGATIONS OF INJECTION WELLS Russian patent published in 2013 - IPC E21B47/117 

FIELD: oil and gas industry.

SUBSTANCE: method involves pumping cycle of working fluid with constant flow rate to injection well and further shutdown of the well with recording of pressure decline curve (PDC). In addition, repeated pumping cycle is performed with recording of pressure stabilisation curve (PSC); at that, pumping flow rate is chosen so that the cycle pressure is higher than formation fracturing pressure. Then, as per the investigation results and pressure decline curve and pressure stabilisation curve method there determined are formation conductivities h_PDC and kh_PSC, and then, ratio of those conductivities: kh_PDC/kh_PSC. Based on the criterion of kh_PDC/kh_PSC<1 ratio, the conclusion is made on crossflow availability, and the conclusion is made on its intensity as per 1- kh_PDC/kh_PSC.

EFFECT: improving informativity of hydrodynamic investigations of injection wells at diagnostics of unstable cracks and evaluation of their effect on the formation development.

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