PROCEDURE FOR TREATMENT OF BOTTOMHOLE ZONE OF RESERVOIR OF WELL Russian patent published in 2010 - IPC E21B43/263 

FIELD: oil and gas production.

SUBSTANCE: procedure consists in lowering immersed pressure pulse generator into well. The generator includes a case with a working agent positioned into it, an initiating element made in form of a single unit with it, a bursting element and nozzle orifices. Further, the procedure consists in initiating the working agent and in pulse treatment of a perforation interval. Also as a working agent, generating gas at combustion, there is used a composite material on base of granulated ammonia nitrate and epoxy compound of weight facilitating generation of gaseous products at amount of not less, than 800 l/kg, pulse amplitude 1.10-1.35 of rock pressure of treated reservoir, duration of pulses up to one minute and pulse frequency for this time not less, than 14-15 pulses. Prior to the said main pulse treatment of the perforation interval there is performed a preliminary pulse treatment of the same interval of duration up to 0.005 sec, frequency for this period not less, than 4 pulses and value of the highest pulse amplitude up to 5-6 units of rock pressure. The same working agent out of gas generating composite material is used for this purpose as for successive main pulse treatment. During combustion weight of this material facilitates pressure of actuation of the bursting element in the immersed generator within the range from 80 to 100 MPa.

EFFECT: raised efficiency of pulse treatment of wells due to generation of micro and deeper fissures in bottomhole zone of reservoir increasing permeability.

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