METHOD AND DEVICE FOR THERMAL BOTTOMHOLE FORMATION ZONE TREATMENT AND WINCH TO BE ARRANGED IN CASING PIPE Russian patent published in 2007 - IPC E21B36/04 B66D1/26 

FIELD: oil production, particularly to recover or increase initial oil output from oil production wells along with prevention of mudding structural net development during well operation, with the use of thermal bottomhole formation zone treatment.

SUBSTANCE: method involves heating casing pipe section in perforation zone up to temperature greatly exceeding boiling temperature of oil fractions; maintaining constant temperature regime characterized by casing pipe wall temperature determined from mathematical correlation; determining heat flux distributed transversely to surface to be heated in reservoir rock heating zone with determined initial rock temperature, wherein stable thermal equilibrium condition is kept. Device for above method realization comprises composite sectional units connected with each other and installed in casing pipe. The casing pipe is used as heating and structural load-bearing member. Device has transport head, converters, installation unit, switching-on mechanism, retaining units and connection flanges. The invention permits to assemble device and to bring it into operation without demounting of main conventional oil production equipment. Device may be installed within perforation zone with the use of winch. The winch comprises electric motor, worm reduction gearbox, two drums with traction bands, differential mechanism, cross-arm with hooks and orientator made of elastic material. Winch for device installation within perforation interval of casing pipe may be used after cross-arm substitution for swab with the purpose of oil bottomhole formation zone cleaning (swabbing).

EFFECT: increased simplicity and convenience along with increased oil output and decreased power inputs, which result in decreased produced oil cost.

4 cl, 5 dwg