Method for huff and puff production increasing through reinjection of steam-drive oilfield producing well associated gas into heavy oil reservoir

Abstract

The invention provides a method for huff and puff production increasing through reinjection of steam-drive oilfield producing well associated gas into a heavy oil reservoir. The method comprises the steps: the collected steam-drive oilfield producing well associated gas is converted into a thermal fluid; and then the thermal fluid is reinjected into a heavy oil reservoir formation to be huffed andpuffed to complete production increasing of the heavy oil reservoir. The method solves the problems such as oilfield associated tail gas resource waste and environment pollution in the prior art, andcan convert the steam-drive oilfield producing well associated gas into the multi-component thermal fluid capable of being reinjected into the formation to be injected into the heavy oil formation tobe huffed and puffed to achieve production increasing of the heavy oil reservoir, and the oilfield producing well associated gas is recycled.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a method for increasing production by using steam flooding associated gas from production wells in oilfields to reinject heavy oil reservoirs. Background technique [0002] Oilfield associated tail gas is the gas that cannot be directly used when it is discharged with petroleum liquid during oilfield exploitation. When using fire flooding, steam flooding or gas flooding (such as CO 2 In the process of exploiting oil with EOR technology such as flooding), the methane gas contained in the oil will be discharged together with the oil and gas, and become the associated gas in the oilfield exploitation process. The associated gas with high concentration (>30% vol) can be directly or Indirect utilization, and associated gas with low content (generally containing 1-10% vol of methane) cannot be directly burned and utilized, and most of them are directly vented on the s...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for increasing production by steam flooding oilfield production wells with associated gas reinjection into heavy oil reservoirs, which overcomes the problems of waste of oilfield associated tail gas resources and environmental pollution in the prior art. The associated gas of production wells in oilfields is converted into multiple thermal fluids that can be reinjected into formations, and injected into heavy oil formations to increase the production of heavy oil reservoirs and realize the recovery and utilization of associated gas in oilfield production wells

Images