Expandable sand screen and method for well casing for thermal oil recovery

• Main Authors: Marat Gafurovich Sabirov, Vitaly Petrovich Filippov, Gabdrashit Sultanovich Abdrakhmanov, Anatoly Valentinovich Dmitriev, Marat Azatovich Ismagilov, Nigamatyan Khamitovich Khamitiyanov, Rustam Khisamovich Ilalov, Farit Foatovich Akhmadishin, Ravil Rustamovich Ibatullin, Marat Marsovich Zalyatov
• Format: Patent
• Language: English
• Published: 28.02.2018
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

A method of well casing permitting thermal oil recovery includes drilling a wellbore to the top of productive formation, casing the wellbore with a casing string, drilling through the productive with a smaller diameter bit, running in a sand screen to the productive formation and subsequent drainage or heat carrier injection into the formation. The sand screen contains longitudinally-corrugated pipes with slots, mutually connected by the end cylindrical portions with a limited longitudinal shift possibility. Besides, the sand screen slots are internally hermetically sealed with a thermoplastic material. Running-in of the screen down to the target depth, include creating an internal excess pressure to expand the sand screen along its entire length except for cylindrical sections, fixing and hermetical anchoring to the casing. Pumping-in of a heat-carrier, under influence of which the thermoplastic material melts up, unseals the slots.