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Since the development of steam stimulation in Shanji Temple, the main heavy oil reservoirs have entered the late stage of propagation and development, and the degree of recovery is close to the ultimate recovery of steam stimulation. The sweeping radius of steam stimulation is only about 50 meters. The well interval has a rich residual oil. It is difficult to effectively use this part of the remaining oil in the steam stimulation mode.
In response to this situation, they implemented an unstable composite steam flooding technology. This technology allows high-pressure, low-pressure steam pulses to periodically act on the formation, forcing steam from high-permeability, high-permeability, high-permeability zones, into low-permeability, low-permeability, low-permeability zones, and expanding the volume of steam. When the injection and injection cycles are alternately changed between different well groups, the pressure field in the ground constantly changes, so that the hot water after the steam is condensed constantly changes the flow direction and increases the steam sweep coefficient. Up to now, the application of this technology has been tested in three well groups such as 6-4-24. The three well groups were injected 9 times, and the 14 wells were all effective. In the cumulative stage of the affected wells, the amount of liquid collected was 143,812 tons, the oil production was 58,839 tons, and the oil-gas ratio was 0.76, which was 0.23 higher than that before steam flooding.
Unstable composite steam flooding enhances the development of heavy oil
The Binnan Oil Production Plant applied unstable composite steam flooding technology and achieved good results in increasing production and increasing efficiency in the development of the single-chassis super heavy oil reservoir.