METHOD TO TREAT WELLBORE ZONE OF FORMATION Russian patent published in 2010 - IPC E21B43/25 E21B37/00 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to oil production and can be used in developing and cleaning wellbore zones of oil formations. Substance claim: proposed method comprises injecting fluid into well to reach tolerable pressure, bleeding fluid by opening borehole cavity, generating intermittent pressure pulses in wellbore zone of the formation in the form of travelling shockwave by abrupt shutting off well cavity during most intensive fluid bleeding from the well. Pressure variation is controlled using mouth pressure pickup. Bleeding is resumed at the maximum depression pressure drop by opening well cavity. Bleeding stages accompanied with shockwave generation are repeated till reduction in generated pressure drop. Note here that, on injection fluid into well cavity, intermittent pressure pulses are generated in the formation wellbore zone formation in the form of travelling shockwave by abrupt shutting off well cavity during most intensive fluid injection rate. Pressure variation is controlled using mouth pressure pickup. Injection is resumed at the maximum repression pressure increase by opening wellbore cavity during injection. Bleeding stages accompanied with shockwave generation are repeated till reduction in generated pressure drop.

EFFECT: higher efficiency of formation wellbore zone treatment.

5 dwg