METHOD OF TREATMENT OF BOTTOM HOLE OF WELL FORMATION AND SUBMERGED GENERATOR OF PRESSURE PULSES FOR IMPLEMENTATION OF THIS METHOD Russian patent published in 2008 - IPC E21B43/263 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to operation of oil, gas and water extracting wells and is designed for creating of micro and deeper crevices in bottom hole formation to increase its penetrability. The invention facilitates increased efficiency of treatment of formation bottom hole zone, reliability and safety of operation as well as simplification of the design. The essence of the invention is as follows: the method assumes lowering of a submerged generator of pressure pulses into a well; the said generator consists of a case with a located within working agent; of a working agent initiating component, of a breakdown component and nozzle holes; further the method assumes initiating of the working agent and carrying out pulse treatment of perforation interval. According to the invention a composite material generating gas at burning is used as a working agent; it is made on the base of granulated ammonium nitrate and epoxy compound with a mass providing generating of gaseous products not less than 800 l/kg, the amplitude of pulses 1.1-1.35 of mine pressure of the treated formation, the duration of pulses up to a minute and pulse frequency during this duration not less than 14-15. In case the working pressure is not achieved in the generator at burning of the working agent there is foreseen the possibility of the safe dropdown of pressure in the generator case after its lifting to a daylight. The device contains the case with the working agent located within and with the working agent initiating component, the breakdown component and nozzle holes. The working agent and component initiating it are made as a whole unit with a direct contact of the initiating component with the surface of the working agent. The breakdown component is made as a membrane of a preset thickness of a metal sheet of circular shape and is secured by means of a connecting pipe located in the lower portion of the generator case; there are also made nozzle holes and a screw rod in the connecting pipe; the screw rod is designed to move in the direction of the membrane, with opening of the membrane and dropdown of pressure of gases in the case of the generator after lifting of the device to the daylight. At that the composite material, generating gas at burning, is used; it is produced on the base of granulated ammonium nitrate and epoxy compound.

EFFECT: facilitates increased efficiency of treatment of formation bottom hole zone, reliability and safety of operation as well as simplification of design.

2 cl, 2 dwg