... importantly, the quality of cement, which is difficult to evaluate quantitatively downhole, casts a significant impact on formation density measurement. To obtain accurate thru-casing density in scenarios where cement information is incomplete or uncertain, a new interpretation model is introduced...

... algorithm developed ceived and counted by detectors. The relationship be- by obtaining a formula that correlates the four-detector tween the count and the formation density is as follows responses. This algorithm is validated against actual log- (Ellis and Singer, 2007): ging data and show a better though...

... significantly in the presence window characteristics (sensitivity to formation density, of casing due to the expected strong PE effect. formation photoelectric factor [PE], and depth of investigation [DOI]) are integrated to yield openhole formation properties (Allioli et al., 1997). A method to estimate...

... to open-hole wells. Several studies have indicated that it is feasible to measure formation density using a density logging tool in cased well under certain conditions, of which the key problem is to determine casing thickness, cement thickness and cement density. This study proposes a novel method...

... Abstract In order to better evaluate the formation density, casing and cement ring integrity under casing well conditions, a high precision four detector density logging tool was designed and developed. Theoretical methods and experimental studies are carried out on the relationship between...

... and experimental data prove that the physics of the formation density measurement using a sonde with an X-ray generator and scintillation detectors can be described in the same way as the traditional density measurement, which is based on a monoenergetic gamma ray source. Although the 137 Cs gamma-ray source...

... for a given tool. A Monte Carlo model of a logging-while-drilling (LWD) natural gamma ray imaging tool has been used to study the DI at various dip angles, formation densities and borehole environmental conditions. To benchmark the simulation model, an experimental tank was built with a low- and a high...

... detector gamma ray SNGD reservoir log analysis Griffith neutron porosity Symposium spwla 54 well logging chemical source evaluation Density correction Upstream Oil & Gas bed boundary effect formation density ADCO acquisition carbonate reservoir Abstract A new...

... of a viable sourceless alternative creates a problem for the industry. The fact that formation density and neutron porosity measurements are used for much more than just formation porosity complicates the issue considerably. This paper examines some of the potential benefits of using neutron generators...

...SPWLA 51st Annual Logging Symposium, June 19-23, 2010 1 FORMATION DENSITY MEASUREMENTS IN CASED WELLBORES FOR GAS SATURATION ANALYSIS Ronald Plasek, Consultant, Laurent Mossé, and James Hemingway, Schlumberger Copyright 2010, held jointly by the Society of Petrophysicists and Well Log Analysts...

... well logging filtrate invasion neutron porosity Upstream Oil & Gas GGD measurement investigation resolution formation density density measurement log analysis detector porosity Symposium NGD measurement reservoir spwla 50 hydrocarbon density LWD tool invasion SPWLA 50th...

... specifications. log analysis porosity error well logging Upstream Oil & Gas formation density calibration track 4 log data synthetic log data dynamic calibration standoff detector mud weight Symposium in-situ calibration bulk density spwla 49th pre-job calibration tool wear density...

... well logging Thickness cement thickness implication standoff log analysis Samworth porosity evaluation saturation Upstream Oil & Gas variation cement density Symposium gas saturation resolution formation density open hole correction spwla 47 equation cased hole count...

... porosity barite content Upstream Oil & Gas formation density Computation log analysis mud weight diameter barite concentration borehole size determination density caliper standoff hole size spwla 47 well logging borehole apparent mud weight Symposium resistivity caliper SPWLA...

... technique also recently developed is to obtain a transform of the PNC measurements directly into formation density by applying a neural network ensemble (NNE. In this case, a well (the training well having both a density log and a PNC log must be available. The effects of the borehole environment...

... logging tools were developed to exploit this sensitivity; however, none of these experimental prototypes has been developed into a commercial service. This study analyzes the response of a three-detector wireline density tool to formation density in cased wells. The tool response was experimentally...

... Upstream Oil & Gas porosity formation formation density algorithm formate drilling fluid spwla 43 formate nuclear log correction cesium formate formate brine porosity Symposium invasion drilling fluid borehole formate mud interpretation University SPWLA 43 rd Annual Logging...

... sensor measurements in order to derive corrected formation density as a function of the detector count rates. In this paper, we discuss a measurement analysis technique based on physical response models of the sensors. These models predict the tool response as a function of various physical...

... ABSTRACT Over the last few years, the fundamentals of formation density measurement have been questioned. Theoretical papers have reported finding substantial errors in the rib-spine technique. While these theoretical arguments appear to be compelling, they are not reconciled with experimental...

..., and is implemented completely in downhole software. The tool must be eccentered and rotating so that minimum standoff is experienced during part of the tool rotation. Since changes in count rate indicate variation in standoff, the effectiveness of the method requires a minimum amount of mud to formation density...