5. WIRELINE LOGGING 5.1 What is a Wireline Log

The tools required to make these measurements are attached to the drill string behind the bit, and do not use a wire relying instead on low band-width radio ... largest wireline companies are Schlumberger and Halliburton, although there is a range of smaller specialist companies too.

  Tool, Schlumberger

Chapter 5: Porosity - University of Leeds

(xiv) Vug porosity Porosity associated with vugs, commonly in carbonate rocks. It should be noted that if the bulk volume and dry weight, or the bulk volume, saturated weight and porosity of a rock sample is known, then the grain density can be calculated.

  Porosity, Porosity porosity

16. THE SONIC OR ACOUSTIC LOG 16.1 Introduction

16. THE SONIC OR ACOUSTIC LOG 16.1 Introduction The sonic or acoustic log measures the travel time of an elastic wave through the formation. This information can also be used to derive the velocity of elastic waves through the formation.

  Waves, Acoustic, Sonic

Chapter 2: Reservoir Fluids - University of Leeds

Helium 0.06983 0.07179 Argon 0.2516 0.1760 Radon 1.675 0.8911 Hydrogen 0.1413 0.1313 ... pressure-volume relationships obtained can be plotted on a pressure-volume diagram with the bubble point and dew point locus also included (Figure 2.2). Note that the bubble point and ... phase and liquid phase can coexist, and hence have an interface (the ...

  Phases, Diagrams, Helium

19. ELECTRICAL LOGGING 19.1 Introduction

Electrical logs are perhaps the most important tools available to a petrophysicist. This is because they provide a method for calculating the water saturation, upon which calculations of STOOIP are based. They were also some of he first logs to be used, with …

  Tool

4. FLUID SATURATION AND CAPILLARY PRESSURE 4.1 Fluid ...

Take the surface of any liquid droplet, and imagine that a circle is drawn on this surface with radius R. The area of the circle is pR2 (Fig. 4.2). To increase the surface area of this drop by one unit of surface area, work must be done to move molecules from …

  Surfaces, Area, Surface area

15. THE NEUTRON LOG 15.1 Introduction

15. THE NEUTRON LOG 15.1 Introduction The neutron log is sensitive mainly to the amount of hydrogen atoms in a formation. Its main use is in the determination of the porosity of a formation. The tool operates by bombarding the formation with high energy neutrons. These neutrons undergo scattering in the formation, losing energy

  Introduction, Scattering, Neutron

StaMPS/MTI Manual - University of Leeds

of >>before a command indicates that the command is a matlab script. 1.2.1Pre-processing There are two potential pre-processing steps before getting to the PS/MTI processing proper. The first is to focus the raw data (if required), and the second is to form interferograms from single-look complex (SLC) images.

  Image, Processing, Matlab

Chapter 10: Relative Permeability

Typical intermediate wettability relperm data are shown in Figures 10.17 and 10.18. The shape of the relperm curves is significantly different for the high and low rate floods. However, the volume of oil produced is similar. Figure 10.19 shows steady state data obtained from a core containing mobile kaolinite fines.

  Wettability

2. POROSITY - University of Leeds

between 0 and 1, or a percentage varying between 0% and 100%. Sometimes porosity is expressed in ‘porosity units’, which are the same as percent (i.e., 100 porosity units (pu) = 100%). However, the fractional form is ALWAYS used in calculations. Porosity is calculated using the relationship (2.1) where: V pore = pore volume V bulk = bulk ...

  Between, Relationship, The relationship

Understanding Soil Resistivity Testing - AEMC

Soil Resistivity Testing Soil resistivity measurements have a threefold purpose. First, data is used to make sub-surface geophysical surveys as an aid in identifying ore locations, depth to bedrock and other geological phenomena. Second, resistivity has a direct impact on the degree of corrosion in underground pipelines. A decrease in

  Measurement, Resistivity, Resistivity measurements

Electrical Resistivity of Concrete - Giatec Scientific Inc.

resistivity measurements using two different signal frequencies (40 Hz and 1 kHz) in the uniaxial method. The use of a low- frequency signal (40 Hz) increased the measured resistivity by 9% compared to 1 kHz signal. So, in the uniaxial technique, the resistivity measurement at low frequencies (below 500 Hz)

  Measurement, Resistivity, Resistivity measurements

TECHNIQUES FOR MEASURING RESISTIVITY FOR MATERIALS ...

To simplify measurements, the 4200A-SCS Parameter Analyzer comes with a project that contains tests for making resistivity measurements using a four-point collinear probe. The 4200A-SCS can be used for a wide range of material resistances including very high resistance semiconductor materials because of its high input impedance (>1016 ohms).

  Measurement, Resistivity, Resistivity measurements

RESISTIVITY OF SEMICONDUCTORS BY FOUR PROBE …

all the measurements and not the resistivity measurements only. FOUR PROBE METHOD Many conventional methods for measuring resistivity are unsatisfactory for semiconductors because metal-semiconductor contacts are usually rectifying in nature. Also there is generally minority carrier injection by one of the current carrying contacts.

  Measurement, Resistivity, Resistivity measurements

Surface Resistivity and Surface Resistance Measurements

Surface Resistivity and Surface Resistance Measurements Using a Concentric Ring Probe Technique electrodes. Meter provides a constant voltage U and measures the current I flowing between elec-trodes. Resistance Rs is then easily calculated and the value of resistivity is equal to the value of resistance multiplied by the geometry coefficient.

  Measurement, Resistivity

2. Electrical resistivity methods

2. Electrical resistivity methods The resistivity method is used in the study of horizontal and vertical discontinuities in the electrical properties of the ground. It utilizes direct currents or low frequency alternating currents to investigate the electrical properties (resistivity) of the subsurface.

  Resistivity

Standard Test Methods for DC Resistance or Conductance of ...

3.1.11.1 Discussion—Volume resistivity is usually ex-pressed in ohm-centimetres (preferred) or in ohm-metres. Volume resistivity is the reciprocal of volume conductivity. 4. Summary of Test Methods 4.1 The resistance or conductance of a material specimen or of a capacitor is …

  Resistivity

Force Sensitive Resistor (FSR) - Adafruit Industries

Nov 15, 2021 · resistance of the sensor at different force measurements. (Note that force is not measured in grams and what they really mean is Newtons * 100!) It is important to notice that the graph isn't really linear (its a log/log graph) and that at especially low force measurements it quickly goes from infinite to 100KΩ. Testing an FSR

  Measurement, Force, Force measurement

Bioelectrical Impedance Analysis in Body Composition ...

of resistivity ( ). It is then observed that the end-to-end resistance (R) is the resistivity times the length (L), divided by the cross-sectional area (A) (i.e., R = L/A). Multiplying the right side of the equation by L/L gives R = L. 2 /Vol, where . Vol. is the volume. Rearranging gives . Vol = L. 2 /R, an equation that allows one to ...

  Analysis, Compositions, Body, Impedance, Resistivity, Bioelectrical impedance analysis in body composition, Bioelectrical

Chapter 4 RADIATION MONITORING INSTRUMENTS - IAEA

CHAPTER 4 104 Survey meters come in different shapes and sizes, depending upon the specific application (see Fig. 4.2). The gas is usually a non-electronegative gas in order to avoid negative ion formation by electron attachment, which would increase the collection time in the detector, thus limiting the dose rate that can be monitored.