Ultra-dry carbon dioxide foam generating device for coiled tubing and application thereof

Abstract

The invention discloses an ultra-dry carbon dioxide foam generating device for a coiled tubing and application of the ultra-dry carbon dioxide foam generating device. The device comprises a water locking module, a shearing oscillation module and a water storage mixing module which are arranged in a steel pipe. The water locking module can slow down the problem of fluid channeling of carbon dioxide, and efficient generation of ultra-dry carbon dioxide foam is facilitated; the shearing oscillation module is used for establishing a new ultra-dry carbon dioxide foam flowing channel by changing thearrangement mode of a gas-liquid shearing model, so that the flow state of the ultra-dry carbon dioxide foam is changed, and gas-liquid mixing is enhanced; the water storage mixing module is used forcarrying out secondary water storage through a spherical water storage grid and is mixed with subsequent gas, so that the occurrence of gas-liquid slug flow is inhibited, the regeneration capacity ofultra-dry carbon dioxide foam is improved, and the agglomeration and deposition phenomena of fly ash particles are inhibited. The device disclosed by the invention can stably work in a high-temperature and high-pressure severe environment; the device is matched with the coiled tubing for operation, the difficulty and complexity of ultra-dry carbon dioxide foam generation are reduced, and application and popularization of an ultra-dry carbon dioxide foam system are facilitated.

Description

technical field [0001] The invention relates to an ultra-dry carbon dioxide foam generating device for coiled tubing and its application, and belongs to the technical fields of carbon sequestration and utilization technology and fly ash comprehensive utilization equipment. Background technique [0002] With the excessive consumption of global fossil fuels, the concentration of carbon dioxide in the atmosphere continues to rise, leading to global warming and endangering the ecological balance. In order to solve the problem of global environmental change caused by carbon dioxide greenhouse gas, carbon sequestration and utilization technology has been paid more and more attention. Carbon dioxide foam flooding is not only a widely used enhanced carbon sequestration technology, but also an important means to enhance oil recovery. In particular, the use of ultra-dry carbon dioxide foam (water content less than 10%) can further improve the sequestration rate and utilization rate o...

AI Technical Summary

Problems solved by technology

[0004] For the fly ash reinforced ultra-dry foam system, the fly ash particles are easy to agglomerate and deposit in the carbon dioxide foam system, and it is difficult to disperse evenly on the surface of the liquid film under low shear; at the same time, the fly ash particles need to consume a certain The traditional downhole foam generator is not enough to provide strong shear energy through spiral and baffle devices, and it is difficult to achieve the effect of fully supplementing the adsorption energy of the fly ash particle interface

In addition, the ultra-dry carbon dioxide foam is composed of polyhedral unit bubbles with ultra-low liquid content, and there are also problems of difficult foaming and rapid defoaming. It is difficult to obtain a dense and uniform ultra-dry carbon dioxide foam system by using a traditional downhole foam generator

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