DEVICE FOR WELL BOTTOM ZONE TREATMENT Russian patent published in 2007 - IPC E21B43/18 C09K8/70 

FIELD: oil production, particularly devices adapted to increase well yield by well bottom zone treatment.

SUBSTANCE: device comprises air chamber having pressure equal to atmospheric pressure and receiving chamber made of light-weight elastoplastic material and filled with solid composite material. The elastoplastic material ruptures as solid composite material combusts inside the chamber. The material consists of two components. The first component faces air chamber and is created of the following mix (% by weight): granular ammonium nitrate - 45-46, potassium dichromate - 1-2, epoxy resin - 40-42, plasticizer 2-3, hardener 9-10. The second component is created of mixture having strength exceeding well bottom pressure and including the following substances (% by weight): granular ammonium nitrate - 70-74, potassium dichromate - 3-5, epoxy resin - 19.5-21.5, plasticizer 1.5-2.0, hardener 3.5-4.5. Said solid composite material is formed as cylindrical member fixedly secured with respect to receiving chamber body by metal pins extending in radial direction.

EFFECT: increased operational reliability and efficiency, simplified production and decreased device cost.

1 ex, 1 dwg