DEVICE FOR THERMO-CHEMICAL TREATMENT OF WELLS Russian patent published in 2013 - IPC E21B37/06 

FIELD: oil and gas industry.

SUBSTANCE: device is made as concentrically arranged aluminium external thin-wall perforated tube and internal tube or rod, filled with chemically active substance in a form of hollow cylinders pressed from calcium and aluminium bits. The cylinders are beaded on internal tube or rod and located in external perforated tube. Device face ends are closed by covers that have internal hole equal to diameter of internal tube or rod and round thread on external part. Head part of the device is olive-like. There are holes 2-4 mm in diameter at the cover in device tail part. Clear area of external tube perforation amounts from 5 to 50% of its surface area and increases from tail part towards head part by 2% of tube area at each 5 cm of its length. The ratio of calcium and aluminium is 70:30; 60:40 and 50:50 wt %, note that the density of chemically active substance changes from 1.1 to 1.5 g/cm³, internal tube's wall is by 1.5 times thicker than the external one. Cover holes in device tail part are made at an angle of 30° against tube axis.

EFFECT: increase of efficiency and reliability.

1 dwg