ULTRA VISCOUS OIL HETEROGENEOUS RESERVOIR DEVELOPMENT METHOD Russian patent published in 2019 - IPC E21B43/27 E21B43/24 E21B7/04 E21B47/06 E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil-producing industry. Heterogeneous super viscous oil reservoir development method includes the super-viscous oil reservoir area drilling by the evaluation vertical wells array, conducting the GWL complex geophysical surveys, according to the obtained materials and the core laboratory studies generalization results, obtaining of the high-viscosity oil reservoir preliminary geometric and geological and physical parameters, updating of the oil-bearing contours, compacted and clay interlayers presence detection, design of the single-hole horizontal wells pairs placement, the lower production and upper injection, which horizontal sections are placed in parallel one above the other in the reservoir vertical plane in the formation areas with the least amount of interlayers. In the horizontal wells performing the GWL for the compacted and clay interlayers updated determination, as well as oil saturation along the paired wells horizontal shafts. Lowering the corresponding tubing strings into the wells, wherein the two tubing strings ends in the injection well are located in the horizontal well bore first and second halves in the highest oil saturation areas, and one tubing string ends or two steam injection tubing strings in the production well are placed with horizontal offset from the injection well tubing string ends by at least 15 m. To ensure uniform heating, in the production well using one tubing string or two tubing strings. Into the injection well the hydrochloric acid and clay acid are pumped in such parts, where between the injection and production wells the most extensive compacted and clay interlayers are found. After sufficient to dissolve seals and clay interlayers technological exposure, into both wells the steam is injected through the tubing strings to create the hydrodynamic connection between the wells, stopping the injection for holding to thermal capillary impregnation and the production well bore cooling. In the production well performing the thermobarometric measurements by means of GWL, based on the results of which, in the production well horizontal well bore, identifying the transitional zones with a temperature between larger and smaller heating, and among the identified zones, determining the zone with a change in the angle of curvature development of not more than 2 degrees per 10 m, in which lowered onto the tubing string pump is arranged. To control the steam chamber uniform heating process, performing the adjustable steam pumping through the injection well tubing strings and controlled products pumping with taking of the thermogram along the production well wellbore through the fiber optic cable and the temperature measurement at the pump intake in the presence of a sensor.

EFFECT: increase in the extra-viscous oil heterogeneous reservoir development efficiency in compacted and clay-bound reservoirs, elimination of uneven heating and the coolant breakthrough into the production well.

1 cl, 4 dwg, 1 ex