METHOD OF HIGH-VISCOSITY OIL DEPOSITS DEVELOPMENT WITH POSSIBILITY OF PERIODIC FORMATION HEATING Russian patent published in 2017 - IPC E21B43/247 E21B7/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the petroleum industry. Method of high-viscosity oil deposits development with possibility of periodic formation heating is characterized by that well is made with dual system of vertical and lateral shafts, wherein both shafts are connected with the same productive formation, lateral shaft face is arranged in 20–25 m from vertical shaft face. Before operation start small-size pump equipment is lowered into well, and parallel tubing string with packer is lowered to vertical shaft face, after that formation warm-up process is initiated via thermal gas-chemical effect, thermo baro chemical processing in mode of gas-liquid fracturing of formation using high-temperature solid-fuel sources or hydro-oxidizing or fuel-oxidizing compositions with heating of near-face area of vertical shaft to depth sufficient for heat effect coverage of near-face section of lateral shaft. Then heating is stopped and product extraction from lateral shaft is started varying duration of cycle depending on rate of reduction of flow. Then product extraction is stopped and formation heating cycle is repeated without lifting of pumping equipment from well, then lateral shaft is put to operation again in product extraction mode.

EFFECT: intensification of oil production and high degree of reserves development with simultaneous reduction of costs and minimizing power consumption for heating of formation, creation of conditions for periodic temperature increase up to 800–1,200 °C and more with thermal front spreading at given depth from source, preservation during heating of filtration-capacitance properties of near-face area of shaft, operated in mode of product extraction, reduced number of tripping operations, high safety of work on wells.

1 cl, 1 tbl, 2 dwg