METHOD AND DEVICE FOR GAS-HYDRODYNAMIC FRACTURING OF PRODUCTIVE FORMATIONS FOR DEVELOPMENT OF PROBLEMATIC RESERVES (VARIANTS) Russian patent published in 2012 - IPC E21B43/263 

FIELD: oil and gas industry.

SUBSTANCE: The invention relates to oil and gas industry, in particular, to methods and devices for intensifying well operation during the development of problematic reserves. The device for gas-hydrodynamic fracturing of productive formations in oil and gas wells includes a logging cable for descending the device and contains the device head and a load-bearing base in the form of metal rod where a gas-generation charge with a steam gauge unit is mounted. The gas-generating charge is a high-energy solid fuel non-detonating composition in the form of sticks with outer diameter of 36-110 mm, length of 500-1500 mm and axial channel diameter of 14-28 mm and an electric fuse. While the gas-generating charge is burning, the pressure increase rate of at least 100 MPa/sec is achieved with the maximum pressure being 2-4 times higher than the hydrostatic pressure. The pressure changing rate is measured with a self-contained digital steam gauge in real time with sensitivity of 7,0 - 10,0 thousand measurements per second. Furthermore, in order to reduce the accident rate and ensure that the gas generator movement in vertical and inclined wells with zenith angle up to 70°, a logging cable of multilayer composition is used with tensile strength of 120 - 160 kN and diameter equal to 12 - 18 mm.

EFFECT: increased efficiency of developing oil-containing zones with slow-moving oil.

4 cl, 3 dwg, 4 ex