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Title: Ultrasonic rate measurement of multiphase flow

On of the most important tools in production logging and well testing is the downhole flowmeter. Unfortunately, existing tools are inaccurate outside of an idealized single phase flow, regime. Spinner tools are inaccurate at extremely high or low, flow rates and when the flow rate is variable. Radioactive tracer tools have similar inaccuracies and are extremely sensitive to the flow regime. Both tools completely fail in the presence of multiphase flow, whether gas/ oil, gas/water or fluid/solid. Downhole flowmetering is important for locating producing zones and thief zones and monitoring production and injection rates. The effects of stimulation can also be determined. This goal of this project is the investigation of accurate downhole flowmetering techniques for all single phase flow regimes and multiphase flows. The measurement method investigated in this report is the use of ultrasound. There are two ways to use ultrasound for fluid velocity measurement. The first method, examined in Chapter 2, is the contrapropagation, or transit-time, method which compares travel times with and against fluid flow. Chapter 3 details the second method which measures the Doppler frequency shift of a reflected sound wave in the moving fluid. Both of these technologies need to be incorporated in ordermore » to build a true multiphase flowmeter. Chapter 4 describes the proposed downhole multiphase flowmeter. It has many advantages besides the ones previously mentioned and is in full in that chapter.« less
Authors:
;
Publication Date:
OSTI Identifier:
6878021
Report Number(s):
DOE/BC/14600-38; SUPRI-TR--89
ON: DE93000112
DOE Contract Number:
FG22-90BC14600
Resource Type:
Technical Report
Research Org:
Stanford Univ., CA (United States). Petroleum Research Inst.
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 47 OTHER INSTRUMENTATION; FLOWMETERS; DESIGN; MULTIPHASE FLOW; MEASURING INSTRUMENTS; OIL WELLS; DOPPLER EFFECT; FLOW RATE; ULTRASONIC WAVES; FLUID FLOW; METERS; SOUND WAVES; WELLS 020300* -- Petroleum-- Drilling & Production; 440800 -- Miscellaneous Instrumentation-- (1990-)