Multiple Composite Steam Stimulation For Increasing Super-Heavy Oil Recovery In Du84 Reservoir

Liaohe oil field Shuyi a super-heavy oil area, the special nature of the steam stimulation of oil production decline faster development, the decline rate of 20 percent. Shuyi area for Du 84 extra-heavy oil reservoir development in the latter part of the problem in carbon dioxide + sulfonate+ steam throughput of the super-heavy oil reservoir studies on the development of great significance.In this paper, super-heavy oil reservoir CO₂ + sulfonate + steam flooding of the technical problems to an area of Liaohe Oil Tianshu Mrs 84 extra-heavy oil reservoir as an example, in the development of dynamic and comprehensive geological study on the basis of indoor And numerical simulation technology to build the capacity of CO₂ dissolved and the volume of crude oil expansion coefficient of the concept of the size and formation of crude oil viscosity decrease in the efficiency of oil displacement and the size of a systematic study of the size and injected into the soaking time, the injection rate of the production cycle Impact.Among the key technology is suitable for super-heavy oil reservoir CO₂ + sulfonate + steam throughput of the mechanism of enhanced oil recovery research.(1) through the interior of the CO₂ stimulation mechanism of oil production, 42 for cold oil samples dissolved - expansion, viscosity reduction, the components of crude oil and distillate analysis, and the efficiency of CO₂ flooding. Oil and gas than CO₂ dissolved for 31.6 m3 / m3, the volume expansion of seven percent, that is, volume coefficient of 1.07, formation of crude oil viscosity viscosity reduction rate of 75% after the saturation throughput fell 4.2 percent aromatic hydrocarbon content decreased 3.2 percent, and asphalt content of Increased 7.4%; CO₂ displacement efficiency was 26.9% to 34.7%. (2) In order to block screening test and optimize the gas injection parameters, theimpact of handling the effects of reservoir parameters (of crude oil viscosity, permeability, oil saturation) and injection-production process parameters (cycle of injection, soaking time) Analysis , The simulation results: When CO₂ into the pore size of multiples (P_V) of 0.1 to 0.15, improving oil recovery rate of large injection of more than 0.2 P_V, the smaller rate of increase oil recovery, CO₂ injection quantity should be 0.15～0.2 P_V for the best.Through the use of numerical simulation technology, the reservoir of oil saturation, the penetration rate of carbon dioxide flooding impact and the injection of carbon dioxide, soaking time, the injection rate effect on the oil wells to study the effects. Finally, the effects of measures of statistics and analysis showed that the carbon dioxide + sulfonate + steam ASP throughput to accelerate the production rate is the exploitation of extra-heavy oil cost-effective technology. The study for the ultra-heavy oil reservoir in the latter part of the efficient development of a new technical support.