How do you measure water resistivity?
How do you measure water resistivity?
The most direct way of finding water resistivity (Rw) is to obtain a sample of formation water and measure its resistivity. However, this is seldom possible in practice, as formation water samples, if available, are invariably contaminated by mud filtrate.
What is a general range of the reservoir fluids resistivity?
To summarize the general relationship between formation resistivity factor and porosity (see Equation 1.49), the normal range for the geometric term, a, is 0.6 to 1.4, and the range for the cementation exponent, m, is 1.7 to 2.5 for most consolidated reservoir rocks [62].
What is formation water resistivity?
Formation water resistivity represents the resistivity value of the water (uncontaminated by drilling mud) that saturates the porous formation. It is also referred to as connate water or interstitial water.
What is deep resistivity?
The annulus zone is logged as medium depth resistivity. The uninvaded zone is the furthest zone from the borehole and has not had any drilling fluid enter it. The resistivity in the uninvaded zone is the true resistivity of the original fluid and formation. The uninvaded zone is logged as deep resistivity.
What is difference between conductivity and resistivity?
Conductivity vs Resistivity Since conductivity is the measure of how easily electricity flows, electrical resistivity measures how much a material resists the flow of electricity.
What is Archie’s equation used for?
Based on Adebayo et al (2014), the first application of Archie’s equation is used to determine the formation factor F, where the formation factor of rock is defined as the ratio of rock resistivity when 100% saturated by brine water, Ro, to the brine water resistivity Rw (Bassiouni 1994, Hamada et al2012).
What is formation water?
Formation water exists naturally in the rock all along, before drilling. It is water associated with the oil and gas reservoir and has some outstanding chemical characteristics. Connate water is fossil water that was out of contact with the atmosphere during most part of the geologic age at least.
How do you solve resistivity?
Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.
Water resistivity determination. The most direct way of finding water resistivity (R w) is to obtain a sample of formation water and measure its resistivity. However, this is seldom possible in practice, as formation water samples, if available, are invariably contaminated by mud filtrate.
What is the purpose of a resistivity | conductivity meter?
Most resistivity | conductivity meters allow you to program the cell constant into the meter to improve the accuracy of the reading. Resistivity | conductivity meters will also measure temperature. This is required so the meter can display the resistivity |conductivity corrected to 25°C.
What is equivalent resistivity of mud filtrate?
These values are referred to as equivalent resistivities and are denoted by Rwe and Rmfe. Thus, the standard equation that relates the SSP to the mud filtrate and uninvaded formation water resistivities is where K is a constant, the value of which is dependent on the formation temperature.
What is the difference between resistivity and conductivity of water?
Resistivity is the reciprocal of conductivity and either may be used to inexpensively monitor the ionic purity of water. Resistivity or conductivity of water is a measure of the ability of the water to resist or conduct an electric current. The ability of water to resist or conduct an electric current is directly related to the amount
