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Device for treating well walls within range of productive bed. RU patent 2244112.

FIELD: oil and gas extractive industry.

SUBSTANCE: device has pipe-like body with detachable upper and lower sleeves. Concentrically to body, with possible rotation relatively to it, a cover is mounted with blades with scrapers placed spirally on its surface. To lower sleeve a reactive end piece is connected with slit apertures. End piece hollow is filled with granulated material engaging in exothermal reaction with acid. Lower portion of end piece is provided with check valve. Upper sleeve is provided with check valve having locking element in form of sphere with shelf and centering elements, to be dropped from well mouth. Base of saddle of check valve is made in form of disc having diameter equal to diameter of body. Pass aperture of saddle in lower portion is overlapped with easily destructible and easily removed element. Length of sphere shelf is greater than height of pass aperture of saddle of check valve of upper sleeve.

EFFECT: higher reliability, higher efficiency, broader functional capabilities of device.

3 cl, 4 dwg, 1 tbl

IPC classes for russian patent Device for treating well walls within range of productive bed. RU patent 2244112. (RU 2244112):

E21B43/27 - by use of eroding chemicals, e.g. acids

E21B43/25 - Methods for stimulating production (dump bailers E21B0027020000; vibration generating arrangements E21B0028000000; chemical compositions therefor C09K0008600000)

E21B37 - Methods or apparatus for cleaning boreholes or wells (E21B0021000000 takes precedence;cleaning pipes in general B08B0009020000)

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