Fly ash reinforced foam forming device for oil field and application thereof

Abstract

The invention discloses a fly ash reinforced foam forming device for an oil field and application thereof. In the forming device, the top of a coal ash-foaming agent mixer is provided with a feed port, a first injection port of a foaming agent solution and a mixing stirrer, and the bottom of the coal ash-foaming agent mixer is communicated with a coal ash dispersion liquid flow divider through a coal ash mixed liquid discharging pipe; a flow-dividing stirrer is arranged at the top of the fly ash dispersion liquid flow divider; a first-stage dispersion liquid discharging pipe, a second-stage dispersion liquid discharging pipe and a third-stage dispersion liquid discharging pipe are arranged on the side wall of the coal ash dispersion liquid flow divider in the radial direction of the side wall and communicated with a coal ash reinforced foam generator; and a gas injection port and a foam generator discharging port are formed in the coal ash reinforced foam generator. The fly ash reinforced foam forming device overcomes the defect that the particle size of fly ash in fly ash reinforced foam cannot be controlled in conventional devices is overcome, realizes rapid and efficient flow division of fly ash dispersion liquids with different particle sizes, and can form a foam slug carrying fly ash with different particle sizes in one-shot construction, thereby realizing profile controlswitching between a near wellbore area and a far wellbore.

Description

technical field [0001] The invention relates to a fly ash reinforced foam forming device for oil fields and an application thereof, belonging to the technical field of fly ash solid waste utilization technology equipment and oil and gas field development engineering. Background technique [0002] Foam fluid flooding technology is an important means to enhance oil recovery, the formation of foam helps to control CO 2 Etc. gas displacement agent mobility in the reservoir, increase CO 2 and other greenhouse gas geological storage and oil displacement capabilities. A large number of applications have shown that foam has a significant effect in plugging high-permeability layers, adjusting water injection profiles, and improving oil washing efficiency. Foam can effectively increase the apparent viscosity of the fluid, thereby increasing the oil-water mobility ratio and increasing the swept volume; at the same time, the surfactant in the foaming liquid can reduce the interfacial ...

AI Technical Summary

Problems solved by technology

First of all, it is difficult for fly ash to be uniformly dispersed in the foaming agent solution, and fly ash is prone to agglomeration and precipitation, which is not conducive to the effective use of fly ash in the foam, which not only causes waste of raw materials, but also affects the stability of fly ash. bubble effect

At the same time, the particle size of the fly ash in the foam is not easy to control. In general, we can only rely on the particle size of the raw material of the fly ash, and the larger particle size or agglomerated fly ash is likely to cause particle deposition near the wellbore and block the near wellbore. reservoirs, it is difficult to achieve deep control and drive

In addition, the artificial feeding method will easily lead to the exposure of fly ash to the air, causing environmental pollution

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