Patent Number: 6,332,351

Title: Detection of salt content of water through measurement of radiation attenuation

Abstract: A method of calculating the salt content of water in a multiphase flow which comprises irradiating a body of the multiphase flow with radiation of three distinct energy levels; measuring the intensity of the transmitted radiation at each of the energy levels, and using the measurements of transmitted radiation as obtained from calibration and radiation mass attenuation coefficients for hydrocarbons for each of the energy levels, to calculate a unique function for representing the salt content of the water. The three energy levels can as an example be provided by the radioactive isotope Barium 133 and the radiation mass attenuation coefficients for hydrocarbons can be calculated theoretically or derived from static calibration measurements. The invention is particularly suited for the measurement of water salinity in a stream comprising a mixture of oil, water, and gas, i.e., a multiphase flow, without separating the phases. It is required to accurately determine the water phase salinity and to use the measurement to calibrate the other sensors or measuring equipment. In addition, the water salinity is often of interest to the well operators as an absolute value which may then be compared with other wells or monitored over a period of time.

Inventors: Torkildsen; Bernt Helge (Bergen-Sandviken, NO)

Assignee: Framo Engineering A.S.

International Classification: G01N 33/28 (20060101); G01N 33/26 (20060101); G01N 23/02 (20060101); G01N 23/12 (20060101); G01N 023/08 ()

Expiration Date: 12/25/2018