EARLY IDENTIFICATION METHOD OF NATURAL FRACTURING OF FORMATIONS Russian patent published in 2013 - IPC E21B43/00 E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: method involves drilling of exploratory wells, performance of their trial operation, alternating pumping to each of the exploratory wells of the specified volume of portions of water-repellent fluid on water basis or oil with indicator, identification of presence or absence of natural fractures-channels of high conductivity in carbonate deposit and positions of fracturing zones as per pressure pulse transmission speed between exploratory wells at pumping to them of portions of water-repellent fluid on water basis or oil with indicator as per indicator advancing speed from one exploratory well to the other in a single-phase filtration mode, as per dynamics of change of formation pressure at trial operation of carbonate formation and as per determination of the main directions of hydrodynamic interaction of wells with characteristic of interaction degree. Type of carbonate deposit is determined as per the data of the above explorations; production wells are arranged on the deposit depending on the type of carbonate deposit and position of fracturing zones. Explorations are enlarged using production wells and considering the data as per dynamics of change of formation pressure at elastic closed natural development mode of carbonate deposit at early stage. Type of carbonate deposit and position of fracturing zones is confirmed or specified as per the data of additional explorations. Scheme of further development of carbonate deposit - scheme of injection well arrangement is chosen when changing over the elastic closed natural development mode of carbonate deposit to the development method with artificial maintenance of formation pressure.

EFFECT: possible identification of fracturing using a tracer method at the early stage of industrial exploration of oil reserves and trial operation of exploratory and advancing wells and excluding of reconstructions of water-flooding operation during the deposit development.

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