Immersion probe using ultraviolet and infrared radiation for multi-phase flow analysis

摘要

A system and method for determining characteristics of a multiphase flow in a well/pipe are disclosed. The disclosed system and method use an optical immersion probe including a flow gap across which two or more types of radiation are transmitted in order to measure absorptions of two or more substances within the multiphase flow. Primarily, broadband ultraviolet (UV) and/or near infrared radiations (NIR) are utilized with the probe to gather absorption data at and/or around at least one of the water peaks and at and/or around one or more oil or oil-condensate peaks. This data may be utilized to calculate the water-cut of the multiphase flow over a wider range of gas volume fractions. Additionally, pressure ports having pressure sensors being located on the optical immersion probe for determining the impact pressures and flow rates of different phases of the multiphase flow may also be used.

主权项

1. An optical immersion probe for analyzing a multiphase flow in a pipe, the optical probe comprising:
a housing; one or more first optical conduits, adapted to carry ultraviolet radiation and/or infrared radiation from one or more radiation sources at a first end to a second end; a flow gap across which the ultraviolet radiation and/or infrared radiation is transmitted, wherein the flow gap begins at the second end of the one or more first optical conduits and is configured to operatively engage the multiphase flow in the pipe; one or more second optical conduits adapted to receive at least a portion of the ultraviolet radiation and/or infrared radiation, and transmit at least a portion of the received ultraviolet radiation and/or infrared radiation to one or more spectrometers for spectral analysis; and one or more pressure sensors for measuring impact pressure of at least one of the phases in the multiphase flow, wherein:
the ultraviolet radiation and/or infrared radiation is attenuated through absorption and/or scattering by the multiphase flow in the flow gap;the multiphase flow is analyzed through the ultraviolet radiation and/or infrared radiation attenuation determined by the spectrometers; andthe probe includes at least two pressure sensors divided by a distance equal to the pipe radius.