UNCASED SECTIONAL CHARGE TO APPLY GAS-HYDRAULIC ACTION TO FORMATION Russian patent published in 2006 - IPC E21B43/263 

FIELD: oil well operation, particularly methods for stimulating production.

SUBSTANCE: device comprises ignition unit, charge sections formed of compositions, which provide charge combustion in aqueous, oil-aqueous and acid media, one or several ignition sections to ignite main charge sections and rigging. Charge sections have central channel having developed combustion surface to provide charge burning during predetermined time period and to create pressure sufficient for formation hyrdofracturing. The rigging is made as composite rod passing through central channel of each charge section. Streamlined conical centrators are connected to both rod ends to pull together charge sections. Conical centrators have diameters exceeding that of charge sections. Centering rings are installed between charge sections, wherein centering ring diameters exceed that of charge sections. Rings are formed to prevent charge burning dynamics change. Splitter adapted to divert gas flow generated during charge burning is arranged between lower conical centrator and charge sections. Central charge section channel and inner splitter cavity are formed as container to deliver solid, liquid or gel-like material into treatment interval. To increase container air-tightness container members are connected one to another in air-tight manner. Centering rings are created so that centering rings seal charge section connection areas. Splitter orifices are isolated from ambient medium with case or plugs, which provide breakage of splitter air-tightness during charge burning. Air-tight pads are installed between splitter and charge sections. The pads and centering rings compensate thermal charge elongation within treatment interval. Charge section diameters, central charge section channel configuration and splitter volume are chosen to provide necessary material volume in formation treatment interval.

EFFECT: increased efficiency of well bore zone treatment due to fracturing thereof and well bore zone cleaning of mud, as well as extended time of treatment effect duration.

3 cl, 2 dwg