Measuring and testing – Borehole or drilling – Downhole test
Patent
1994-09-23
1995-10-31
Warden, Robert J.
Measuring and testing
Borehole or drilling
Downhole test
250255, 250264, 250266, 2503561, 2502696, E21B 4700, G01F 1300, G01N 2300, G01V 500
Patent
active
054619092
ABSTRACT:
A method for measuring the linear flow velocity, radial position, direction, and the flow rate of water flowing within and behind a well borehole casing. A logging tool containing a source of essentially monoenergetic 14 MeV neutrons and at least one gamma ray detector is positioned within the well borehole opposite the zone in which water flow measurements are desired. The neutron source is turned on thereby irradiating any flowing water and other areas in the vicinity of the well borehole with high energy neutrons. After a predetermined irradiation time, the neutron source is turned off. Following a quiescent period of several milliseconds to allow thermal capture gamma radiation to decay to a negligible level, the gamma ray detector is turned on and the count rate from the N-16 induced within the flowing water is recorded as a function of time. The linear flow velocity, the Full Width Half Maximum time period, and the total count are determined directly from the resulting count rate curve. The radial position and the flow rate are determined using the predetermined relationship between the Full Width Half Maximum time period, radial position, and linear flow velocity, and the predetermined relationship between linear flow velocity, radial position, and the ratio of the flow rate to the total count for the logging tool. The direction of flow is determined by sensing the presence or absence of flowing N-16 above or below the source.
REFERENCES:
patent: 3084250 (1963-04-01), Dennis
patent: 3115576 (1963-12-01), Rickard
patent: 3239663 (1966-03-01), Oshry et al.
patent: 3603795 (1971-09-01), Allaud
patent: 4032778 (1977-06-01), Paap et al.
patent: 4032779 (1977-06-01), Arnold et al.
patent: 4032780 (1977-06-01), Paap et al.
patent: 4032781 (1977-06-01), Arnold
"The Structure and Interpretation of Noise From Flow Behind Cemented Casing," McKinley, Bower & Rumble, PE Paper 3999, presented at the SPE-AIMEE 47th Annual Fall Meeting, San Antonio, Tex., Oct. 8-11, 1972; also published in Journal of Petroleum Technology, Mar. 1973.
"Advances in Nuclear Production Logging," Wichmann, Hopkinson and Youmans, Transactions SPWLA (1967).
"Improved Oxygen-Activation Method for Determining Water Flow Behind Casing," SPE Formation Evaluation, Sep. 1991 McKeon et al. pp. 334-342.
"Pulsed Oxygen-Activation Technique for Measuring Water Flow Behind Pipe," Ostermeier, The Log Analyst, May-Jun. 1991 pp. 309-317.
"Quantitative Monitoring of Water Flow Behind And in Wellbore Casing," Arnold and Paap, SPE-AIME, Journal of Petroleum Technology, Jan. 1979.
Halliburton Logging Services Inc.
Thornton Krisanne M.
Warden Robert J.
LandOfFree
Oxygen activation method for quantitative water flow measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Oxygen activation method for quantitative water flow measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen activation method for quantitative water flow measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1765555