METHOD OF STABILISATION OF PRODUCING FORMATION WITH UNSTABLE ROCKS Russian patent published in 2012 - IPC E21B43/04 E21B33/13 

FIELD: oil and gas production.

SUBSTANCE: proposed method comprises creating anti-sand filter by forcing polymer composition into bottomhole formation zone via exposed productive formation. Prior to forcing polymer composition, bottomhole formation zone is temporarily isolated by mortar with filler including saw dust. Then, productive formation is isolated to top by forcing composition of cement bridge. Then, casing string is exposed 1-2 m above made isolation with total section area of perforated channels making, at least, 3000 mm². Then, service string is lowered to isolate tube space by parker some 10-15 m above top level of perforated channels. Then breakdown of non-reservoir bed and productive bed is carried out by inclined fractures to force polymer proppant therein. Then service string with parker is withdrawn to produce oil to yield decreased by over 50% of initial yield. Now, productive bed isolation is destructed to expose again the productive bed in its interval.

EFFECT: higher efficiency due to ruled out sand production.

3 dwg