DEVICE FOR TREATMENT OF BOTTOM-HOLE FORMATION ZONE OF OIL WELL Russian patent published in 2013 - IPC E21B43/18 E21B43/24 E21B43/27 C09K8/594 C09K8/72 

FIELD: oil and gas industry.

SUBSTANCE: device for treatment of a bottom-hole formation zone of an oil well includes an air chamber with atmospheric pressure and a receiving chamber made from light-weight elasto-plastic material. In the receiving chamber a provision is made for composite materials of cylindrical shape: slightly gassy material and material that generates gas at combustion, and in addition, the receiving chamber of the device includes composite material that generates gas and acid at combustion between slightly gassy and gas-generating composite materials. Slightly gassy composite material at combustion, which faces the air chamber and is fixed with radially located metal pins relative to the receiving chamber housing, is made of composition containing the following, wt %: agranulated ammonium nitrate grade B 45-46, potassium bichromate 1-2, epoxy resin grade ED-20 40-42, plasticising agent grade EDOS 2-3, hardening agent Agidol grade AF-2M 9-10. Gas- and acid-generating composite material at combustion is made of composition containing the following, wt %: ammonium nitrate 40-50, powder-like fluorine rubber grade SKF-32 with dispersity of 0.5-1.5 mm 10, chlorinated paraffin wax grade KhP-1100 10-30, and fluoroplastic grade F-32L 10-40. Composite material that generates gad at combustion is made of composition containing the following, wt %: ammonia nitrate 78-85, powder-like nitryl butadiene rubber with dispersity of 0.5-1.5 mm 12, and potassium bichromate 3-10.

EFFECT: improving efficiency of a device owing to complex thermogas-dynamic and chemical action on a bottom-hole formation zone of an oil well, reducing slag formation relative to weight of the device by 3-5 times, and simplifying the device manufacture.

1 tbl, 5 ex, 1 dwg