REINFORCEMENT METHOD OF PRODUCTIVE FORMATIONS AT THERMAL METHODS OF OIL EXTRACTION, AND EXTENDABLE FILTER FOR ITS IMPLEMENTATION Russian patent published in 2013 - IPC E21B43/08 

FIELD: oil and gas industry.

SUBSTANCE: proposed method involves drilling of a well shaft till it enters the productive formation and reinforcement with a casing string, drilling of a productive formation with a bit of smaller diameter, assembly of a filter from longitudinally corrugated pipes with slots, which are connected with their end cylindrical sections to each other with possibility of restricted longitudinal movement. Slots of the filter are tightly covered from the inside with thermoplastic material. Then, the filter is lowered to the plant interval; excess pressure is created for expansion throughout the length excluding cylindrical sections; fixation and tight connection by means of an anchor to the casing string; heat carrier supply, under the action of which the thermoplastic material is melted, thus unsealing the slots. The extendable filter includes longitudinally corrugated pipes with cylindrical end sections, which have the possibility of being extended, and equipped with slots on projections tightly covered from inside with thermoplastic material, and a sealing device made in the form of a plug installed on the end of lower pipe of the filter. Pipes are connected to each other through an expansion joint of thermal elongation of the filter.

EFFECT: simplifying the device; improving reliability; reducing costs for the plant and operation.

4 cl, 8 dwg