An ultra-dry carbon dioxide foam generating device for coiled tubing and its application

Abstract

The invention discloses an ultra-dry carbon dioxide foam generating device for coiled tubing and its application. The device includes a water-locking module, a shearing and vibrating module and a water storage and mixing module arranged in the steel pipe. The water-locking module can slow down the channeling of carbon dioxide, which is conducive to the efficient generation of ultra-dry carbon dioxide foam; the shear oscillation module, by changing the arrangement of the gas-liquid shear model, establishes a new ultra-dry carbon dioxide foam flow channel, thereby changing the ultra-dry carbon dioxide foam flow channel. The flow state of dry carbon dioxide foam strengthens gas-liquid mixing; the water storage mixing module stores secondary water through the spherical water storage grid and mixes it with subsequent gas to inhibit the occurrence of gas-liquid slug flow and improve the regeneration of ultra-dry carbon dioxide foam Formation ability, inhibit the agglomeration and deposition of fly ash particles. The device of the invention can work stably in the harsh environment of high temperature and high pressure; cooperate with the coiled tubing to reduce the difficulty and complexity of the generation of ultra-dry carbon dioxide foam, and facilitate the popularization and application of the ultra-dry carbon dioxide foam system.

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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