METHOD OF DEVELOPMENT OF HIGH-VISCOSITY OIL FIELDS WITH STRATA OF SMALL THICKNESS BY WAY OF CYCLIC INJECTION OF SOLVENT AND STEAM INTO SINGLE INCLINED WELLS Russian patent published in 2012 - IPC E21B43/24 

FIELD: oil and gas production.

SUBSTANCE: method of development of high-viscosity oil fields with strata of small thickness by way of cyclic injection of solvent and steam into single inclined wells includes drilling in productive bore of well uphill, location of tubing in this area with centralisers for solvent cyclic injection through them and production string with pumps for oil withdrawal, the maximum curve degree of well uphill is located in the stratum bottom section. The uphill development is performed with ascent angle not less than 5-8° of stratum bottom, the backwall of the uphill is located below the roof not less than 2 m. Before descending of the string that is thermally insulated the well uphill is equipped by filter with two opened zones in the beginning and the end of this area, tubular annulus between the filter and string and between the opened zones is isolated by packer. The pump is located in the bottom area of productive stratum higher than the opened zone in the beginning of the well uphill, but lower than the backwall of the well uphill. The solvent and steam are pumped by turns into the roof of the stratum through the opened zone in the end of well uphill, there performed is a holding for heat distribution in the stratum, then the fluid is withdrawn by pump.

EFFECT: increase of efficiency of development of high-viscosity and extra-viscosity oil fields with strata of small thickness.

2 cl, 1 ex, 1 dwg