DOWNHOLE STIMULATION SYSTEM Russian patent published in 2019 - IPC E21B43/267 E21B43/14 E21B23/00 E21B33/124 

FIELD: drilling of soil and rocks; mining.

SUBSTANCE: invention relates to a downhole stimulation system comprising a well tubular structure located in a wellbore in a formation and having an inside and an inner diameter, the first annular barrier and the second annular barrier to isolate a production zone, moreover, the first annular barrier is located closest to a wellhead, each annular barrier contains a tubular metal part for installation as a part of the well tubular structure, while the tubular metal part has an outer surface; expandable sleeve surrounding the tubular metal part and having an inner surface facing the tubular metal part as well as an outer surface facing a borehole wall, each end of the expandable sleeve is connected to the tubular metal part; annular space between the inner surface of the expandable sleeve and the tubular metal part; slot made in the tubular metal part for letting fluid into said space and having a predetermined slot size, sliding sleeve having at least one profile and located between two annular barriers, as well as having a closed position and an open position, wherein an opening in the well tubular structure provides fluid communication between the inside of the well tubular structure and the production zone, while the profile of the sliding sleeve is located at the first distance from the slot of the annular space, and the opening has a predetermined opening size, downhole tool for moving the sliding sleeve from the closed position to the open position, comprising a tool body and an inflatable device configured to be inflated in the well tubular structure to divide the well tubular structure into a first part and a second part, and at least one key configured to engage the profile so that when the inflatable device is inflated and the first part of the well tubular structure is under excessive pressure, it is ensured that the tool moves downstream, and the key involves the profile in motion, which forcibly ensures the transition of the sliding sleeve from the closed position to the open position, wherein the inflatable device is located downstream from the slot of the second annular barrier so that the annular space of the second annular barrier communicates via fluid with the first part of the well tubular structure when the inflatable device is inflated. In this case, the downhole stimulation system additionally contains a pump adapted to supply fluid under excessive pressure down the well tubular structure to fracture the formation and stimulate the well, and the fluid under excessive pressure is supplied with proppants. Moreover, the proppants have a size that is smaller than the size of the opening, but larger than the size of the slot, and the downhole stimulation system further comprises a displacement means for displacing the proppants down the well through the hole and into the fracture. Present invention additionally relates to a downhole stimulation method for intensifying the production of fluid from a well by means of the downhole stimulation system in accordance with the present invention.

EFFECT: technical result consists in increasing the efficiency of the downhole stimulation system.

15 cl, 9 dwg