Ward E Schultz

US Patent:

47003006, Oct 13, 1987

Filed:

Jun 27, 1984

Appl. No.:

6/625349

Inventors:

Ward E. Schultz - Houston TX
Harry D. Smith - Houston TX

Assignee:

Halliburton Company - Duncan OK

International Classification:

G01V 128
G01V 136
G06F 1520

US Classification:

364422

Abstract:

Statistical variations in simultaneous shallow and deep investigation nuclear borehole logs are reduced using digital moving average data processing while maintaining responsiveness to formation changes, by transitioning through a combination of long and short filtered data as a function of the statistical variation of the deep log data differences of the long and short derived averages. Borehole rugosity is also indicated as a function of the difference between the shallow and the deep log indexes of the differences between their respective narrow and wide derived averages.

US Patent:

46911022, Sep 1, 1987

Filed:

Jun 17, 1985

Appl. No.:

6/745723

Inventors:

Ward E. Schultz - Houston TX
Harry D. Smith - Houston TX

Assignee:

Halliburton Company - Duncan OK

International Classification:

G01V 500

US Classification:

250256

Abstract:

Compensation of photoelectric absorption measurements for borehole effects during nuclear logging of downhole earth formations is accomplished by detecting low energy gamma radiations entering two detectors in the logging tool along paths having substantially constant formation components but varying borehole components.

US Patent:

44369964, Mar 13, 1984

Filed:

May 21, 1981

Appl. No.:

6/265736

Inventors:

Dan M. Arnold - Houston TX
Harry D. Smith - Houston TX
Ward E. Schultz - Houston TX

Assignee:

Halliburton Company - Duncan OK

International Classification:

G01V 500

US Classification:

250256

Abstract:

A method of logging earth formations to ascertain relative elemental abundancies of potassium (K), uranium (U) and thorium (T) is disclosed. A natural gamma ray spectrum of an unknown borehole is compared with individual standard gamma ray spectra of potassium, uranium and thorium in at least four energy ranges or bands. Decay peaks of the three elements are encompassed by three of the energy bands and at least one other energy band is used to monitor the changes in shape of the unknown spectrum caused by borehole conditions differing from that of the standard or calibration boreholes. A function derived from the gamma ray count rates in the four bands is used to compensate the elemental abundancies of the three elements to be detected in the unknown spectrum for the effects of differing borehole conditions in the unknown borehole from the standard borehole conditions.

US Patent:

40327787, Jun 28, 1977

Filed:

Nov 3, 1975

Appl. No.:

5/628169

Inventors:

Hans J. Paap - Houston TX
Dan M. Arnold - Houston TX
Ward E. Schultz - Houston TX
Harry D. Smith - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

G01V 500

US Classification:

250266

Abstract:

Measurement of the distance from a gamma ray detector to a gamma ray source for locating of a channel of undesired behind casing water flow in a producing well is provided. A relationship is given for the count rate ratio at a detector in two distinct energy regions of the gamma ray spectrum as a function of the distance from the gamma ray source. When counts of characteristic gamma rays due to the decay of radioactive nitrogen 16 produced by the activation of elemental oxygen nuclei comprising the molecular structure of undesired water flow are made then the distance R to such flow may be determined by means of the above relationship. This may then be interpreted in terms of the volume flow rate V of the undesired water flow.

US Patent:

39476839, Mar 30, 1976

Filed:

Feb 15, 1974

Appl. No.:

5/442932

Inventors:

Ward Edward Schultz - Houston TX
Harry Davis Smith - Houston TX
Philip France McKinlay - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

G01T 500

US Classification:

250270

Abstract:

A pulsed source of high energy neutrons is used to irradiate the earth formations in the vicinity of a well borehole. Gamma rays produced by the inelastic scattering of the fast neutrons are observed in four energy regions of the gamma ray energy spectrum corresponding to the inelastic scattering of neutrons by carbon, oxygen, silicon and calcium. Signals representative of the carbon/oxygen, calcium/silicon and carbon plus oxygen gamma rays observed are developed. By appropriately combining these signals with a separately derived hydrogen index log the quality of coal bearing formations or oil shale regions penetrated by the borehole may be determined.

US Patent:

44928645, Jan 8, 1985

Filed:

Jul 31, 1981

Appl. No.:

6/288441

Inventors:

Harry D. Smith - Houston TX
Ward E. Schultz - Houston TX

Assignee:

Texaco Inc. - White Plains NY

International Classification:

G01V 510

US Classification:

250259

Abstract:

This invention relates to an improved method for determining the oil saturation of subsurface earth formations in the vicinity of a well borehole. High energy neutrons irradiate the subsurface earth formations and gamma rays caused by inelastic scatter with the subsurface earth formation constituent materials are measured. For a chosen borehole depth, gamma ray logs are taken in different situations: first, with the formation fluid water and oil mixture in an undisturbed state; second, after flushing the formation with alcohol to displace the formation water and oil mixture; and, finally, after flushing the alcohol from the formation with water to obtain a measurement with no oil in the formation. The gamma ray measurements obtained are then used to determine the oil saturation without requiring knowledge of the porosity of the earth formation, borehole conditions or formation type. When the original oil content of the formation is at a naturally flushed, or residual, oil saturation, the present invention may be used to determine the residual oil saturation.

US Patent:

41223403, Oct 24, 1978

Filed:

Apr 20, 1977

Appl. No.:

5/789059

Inventors:

Harry D. Smith - Houston TX
Michael P. Smith - Bellaire TX
Ward E. Schultz - Houston TX

Assignee:

Texaco Inc. - New York NY

International Classification:

G01V 500

US Classification:

250264

Abstract:

An improved pulsed neutron porosity logging system is provided in the present invention. A logging tool provided with a 14 MEV pulsed neutron source, an epithermal neutron detector, and a fast neutron detector is moved through a borehole. Repetitive bursts of neutrons irradiate the earth formations and, during the bursts, the fast neutron population is sampled. During the interval between bursts the epithermal neutron population is sampled along with background gamma radiation due to lingering thermal neutrons. The fast and epithermal neutron population measurements are combined to provide a measurement of formation porosity.

US Patent:

54866952, Jan 23, 1996

Filed:

Mar 29, 1994

Appl. No.:

8/219062

Inventors:

Ward E. Schultz - Fulshear TX
Gordon L. Moake - Houston TX

Assignee:

Halliburton Company - Dallas TX

International Classification:

G01V 504

US Classification:

250261

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.