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Unfocused gamma ray density logging

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Journal Articles
J Pet Technol 43 (07): 780–785.
Paper Number: SPE-20591-PA
Published: 01 July 1991
... the flow moves at a much higher velocity as it rotates thespinner, the diverting flowmeter responds to the total flow rate in asegregated oil/water flow and in a mixed flow. The unfocused density tool, which includes a gamma ray source and detector Fig.4), was also evaluated. Gamma radiation intensity...
Proceedings Papers

Paper presented at the SPWLA 36th Annual Logging Symposium, June 26–29, 1995
Paper Number: SPWLA-1995-S
... natural gamma ray, neutron-gumma (capture), neutron-neutron (thermal and epithermal), and gamma-gamma density. Naer neutron logging tools mu?, be co&xred cz single or dual-detector devices. Nucleur logs used ,fbr porosi@ determination require .spec!$c knowledge of the tool calihrution methods...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 1–4, 2000
Paper Number: SPE-63285-MS
... with petrophysical information available from other logs (e.g., gamma ray, neutron, and density). Therefore, regularizing the inversion problem and applying appropriate petrophysical constraints to reduce the nonuniqueness becomes necessary. Two-dimensional inversion of resistivity logging data has been studied...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 8–10, 2012
Paper Number: SPE-159334-MS
... to the radioisotope-based gamma-gamma density (GGD) measurement. The traditional GGD measurement uses the scattering of 662-keV gamma rays from a 137 Cs radioisotopic source to determine formation density. A statistically precise measurement requires a 40-GBq or higher source strength and such a logging source...
Proceedings Papers

Paper presented at the Archie Conference on Reservoir Definition and Description, November 3–6, 1991
Paper Number: SPE-23542-MS
... . .- . . . . . . . . .. - . -- . . .: ; m g a 10 2 0 - j ' : . ' a . . . . . . . . . .:I3i - 0 . -- 0 5 10 15 20 25 30 Fault Fracture Swarm 7 Note Displacement South I I North 500 R Scale Fig. 8 - Mapping the wellbore wall with an acoustic borehole imaging device Unfocused Density Tool Gamma Ray Source Gamma Ray Detector Logging...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 3–6, 1993
Paper Number: SPE-26433-MS
..., gamma ray, gamma-neutron, density and acoustic logs along with cores and well tests. In contrast to the relatively complete data package gathered from research wells, production wells generally are evaluated with an SP in combination with a combination of lateral logs recorded at different electrode...
Proceedings Papers

Paper presented at the SPWLA 16th Annual Logging Symposium, June 4–7, 1975
Paper Number: SPWLA-1975-GG
... of logging tool. This calibration process will be discussed for the individual tool types in the following sections. Gamma Ray Tool The primary standard for all oilfield Gamma Ray logging tools is the API Test Facility4 in Houston, Texas. The API Gamma Ray test pit consists of a string of 5-l/2 in. casing...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 9–12, 2005
Paper Number: SPE-96898-MS
... the gas cap and in the oil column. An interesting section of this log occurs in the region just below the gas-crossover interval. The orange arrow shows where the neutron and the density curves overlie each other, confirming that the well is in an oil-bearing sand. The gamma ray suggests that this sand...
Proceedings Papers

Paper presented at the SPWLA 46th Annual Logging Symposium, June 26–29, 2005
Paper Number: SPWLA-2005-A
... intervals can be determined from a gamma-ray curve, and a qualitative look at the resistivity curve can differentiate water intervals from hydrocarbon-bearing intervals. If both oil and gas may be encountered, then additional logging tools (e.g., density and neutron) may be necessary. The third function...
Journal Articles
Petrophysics 61 (01): 38–71.
Paper Number: SPWLA-2020-v61n1a1
Published: 01 February 2020
...M. I. Epov; K. V. Sukhorukova; O. V. Nechaev; A. M. Petrov; M. Rabinovich; H. Weston; E. Tyurin; G. L. Wang; A. Abubakar; M. Claverie The most widely used Russian electrical and electromagnetic logging tools are the high-frequency electromagnetic sounding tools (VEMKZ/VIKIZ), the unfocused...
Proceedings Papers

Paper presented at the SPWLA 36th Annual Logging Symposium, June 26–29, 1995
Paper Number: SPWLA-1995-T
... hydrocarbon sand thickness in the thinly bedded upper interval. Database Log data for the present study included standard sample-rate gamma ray/caliper, compensated neutron (sandstone matrix), compensated density, induction resistivity, and compensated acoustic logs. A high- resolution suite (10 samples...
Journal Articles
Petrophysics 31 (06).
Paper Number: SPWLA-1990-v31n6a1
Published: 01 November 1990
.... Figure 5 Porosity from SP and resistivity measurements (from Poupon et al., 1954). The Gamma Ray log was closely followed by the first of the Neutron tools in 1942. Neutron moderation de- vices respond primarily to the hydrogen content of the formation, which is closely related to the porosity in clean...
Proceedings Papers

Paper presented at the SPE International Petroleum Conference in Mexico, November 7–9, 2004
Paper Number: SPE-89884-MS
... and radiation transport processes in three- dimensional configurations. Investigated Measurement Concepts Through-casing Pseudo-density. Density through casing measurements have been proposed using conventional chemical sources of gamma rays such as Cs137.[ 26] In addition, as described in References 14-16...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 22–25, 1995
Paper Number: SPE-30550-MS
... resistivity tool designed to operate in laterolog environments. The tool can be attached to the bit, or else located above the mud motor for non-rotary drilling. Five resistivity measurements, a plateau gamma ray measurement, and axial and transverse shock measurements are acquired. Four of the resistivity...
Journal Articles
J Pet Technol 46 (10): 848–852.
Paper Number: SPE-29242-PA
Published: 01 October 1994
... are based on the assump- tion that the tools are rigid, longer tools do have significant flexibil- October 1994 JPT A COMPARISON OF VERTICAL AND HORIZONTAL WELL GAMMA RAY RESPONSES " REAL" FORM ATION WITH VERTICAL & IJI II~.iI HORIZONTAL WELLS II LOG GAMMA RAY RESPONSE VERTICAL HORlZONTAL Fig. 1...
Proceedings Papers

Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-OO
... and MWD logs are shown. 1. INTRODUCTION The RAB Resistivity-at-the-Bit ool is a new- generation MWD resistivity and gamma ray tool. The tool makes five resistivity measurements, a plateau gamma ray measurement, axial and transverse shock measurements, and a single-axis tool inclination measurement...
Proceedings Papers

Paper presented at the SPWLA 35th Annual Logging Symposium, June 19–22, 1994
Paper Number: SPWLA-1994-J
... to various conditions, results of laboratory measurements, -l- SPWLA 35th Annual Logging Symposium, June 19-22,1994 and a log example showing the present tool pelfOlltlanCe. Litho-Density* Sonde (LDS), the APS sonde, and the Hostile Environment Natural Gamma Ray Sonde (HNGS). The arrangement of the tool...
Proceedings Papers

Paper presented at the SPE Annual Technical Conference and Exhibition, October 22–25, 1995
Paper Number: SPE-30584-MS
... includes density and R xo S.ensors along with a neutron and a gamma-ray measurement within an overall length of 38 ft. The density sens.orwas described by Eyl et at. (1994) and the Rxo sens.or by Eisenmann et at. (1994). An integrated accelerometer permits speed correction in real time for correct depth...
Journal Articles
Petrophysics 35 (05).
Paper Number: SPWLA-1994-v35n5a2
Published: 01 September 1994
..., 1986; Walbe and Collart, 1991; Allen et al., 1993; Peters et al., 1994). NUCLEAR-LOGGING TOOLS New Density Tool In addition to the near and far detectors on the standard compensated lithology-density tool, a new density tool in- cludes a GSO (see Prensky, 1994) backscatter gamma-ray detector close...
Journal Articles
Petrophysics 40 (01).
Paper Number: SPWLA-1999-v40n1a1
Published: 01 January 1999
... than the vertical resolu- tion as usually defined. Moreover, TBIR can also be helpful in the development of new logging in- struments that are desired to possess both deep ra- dial investigation and high vertical resolution. INTRODUCTION The usual logs, such as the sonic, neutron, density, gamma ray...

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