DEVICE FOR PRESSURE LIMITATION IN WELL AND METHOD OF FRACTURING OF PRODUCTIVE FORMATION BY PRESSURE OF POWDER GASES USING NAMED DEVICE Russian patent published in 2015 - IPC E21B43/263 

FIELD: mining.

SUBSTANCE: device contains sealed pig-iron vessel with cylindrical cavity with a ring ledge. It has the piston with the ring insert from quick-cutting steel. Note that the piston diameter is determined from the given approximate ratio. For the formation fracture by pressure of powder gases the device is suspended together with a gas generator on the cable below the level of perforation zone and the operations are repeated with increase of weight of gas generator charge up to the most allowable. After that the additional operations of fracturing by additional charge are performed. For the first additional operation of fracturing the charge is selected, which is larger in comparison with the charge used in fracturing operation with maximum pressure by the value determined from the given approximate ratio. For the subsequent fracturing operations the similar pressure limiters are used. The respective additional charges are selected in view of the length of cutting of internal walls of cylindrical cavity during the previous fracturing operation according to approximate expression.

EFFECT: improving the efficiency of productive formation fracturing.

2 cl, 1 dwg