Radiant energy – Geological testing or irradiation – Well testing apparatus and methods
Patent
1994-03-29
1996-01-23
Fields, Carolyn E.
Radiant energy
Geological testing or irradiation
Well testing apparatus and methods
250254, 250256, 250262, G01V 504
Patent
active
054866952
ABSTRACT:
A standoff compensation system is disclosed for use in an LWD system implementing gamma density and/or neutron porosity measurements. An acoustic transducer is provided to measure the standoff distance between the logging tool and the borehole wall. The present invention includes a downhole processor for determining a weighting factor for the density and/or porosity measurements based upon the measured standoff distance. The weighting factor can either be calculated by the downhole processor according to a predetermined weighting function, or can be retrieved from a pre-calculated look-up table in ROM. The processor then multiplies the weighting factor by the count data from the sensor to determine a weighted count value. The weighted count values are accumulated during an averaging period and normalized, so that a single normalized count value can be generated and either stored in downhole memory, used immediately, or transmitted by telemetry to the surface.
REFERENCES:
patent: Re32913 (1989-04-01), Clark
patent: 4047027 (1977-09-01), Bateman et al.
patent: 4326129 (1982-04-01), Neufeld
patent: 4388529 (1983-06-01), Peelman
patent: 4409481 (1983-10-01), Smith, Jr. et al.
patent: 4423323 (1983-12-01), Ellis et al.
patent: 4424444 (1984-01-01), Smith, Jr. et al.
patent: 4441362 (1984-04-01), Carlson
patent: 4503328 (1985-03-01), Neufeld
patent: 4524274 (1985-06-01), Scott
patent: 4655299 (1987-04-01), Schoeffler
patent: 5091644 (1992-02-01), Minette
patent: 5130950 (1992-07-01), Obran et al.
patent: 5175429 (1992-12-01), Hall, Jr. et al.
patent: 5214251 (1993-05-01), Orban et al.
patent: 5250806 (1993-01-01), Rhein-Knudsen et al.
patent: 5317111 (1994-05-01), Orban et al.
patent: 5354956 (1994-10-01), Orban et al.
patent: 5357797 (1994-10-01), Maki, Jr. et al.
J. Labo; A Practical Introduction to Borehole Geophysics; (86 pg.); Society of Exploration Geophysicists.
D. R. Skinner; Introduction to Petroleum Production; (18 pg.); vol. 1, Reservoir Engineering, Drilling, Well Completions.
Samantha Miller, Anadrill; State of the Art in MWD; 19 Jan. 1993; International MWD Society; (28 pg).
J. R. Birchak, R. G. Matthews, G. L. Moake & W. E. Schultz; Standoff and Caliper Measurements While Drilling Using a New Formation-Evaluation Tool with Three Ultrasonic Transducers; (1993) Society of Petroleum Engineers, Inc. (pp. 793-806).
Michael L. Gartner; Neutron Porosity Measurement While Drilling; IEEE Transactions on Nuclear Science, vol. 35, No. 1, Feb. 1988, pp. 839-843.
Moake Gordon L.
Schultz Ward E.
Fields Carolyn E.
Glick Edward J.
Halliburton Company
Heim Michael F.
Montalvo Eugene
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