Uncertainties associated with laboratory-based predictions of well index and formation damage

Badalyan, Alexander; Chequer, Larissa; Russell, Thomas; Carageorgos, Themis; Zeinijahromi, Abbas; You, Zhixiong; Bedrikovetsky, Pavel

doi:10.1016/j.measurement.2020.108731

Cited by 2 publications

(2 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The uncertainties of the direct measurements were calculated from the mean of the values and their respective standard deviations, conforming to eqs –. The uncertainties of the indirect measurements were estimated from the propagation of the uncertainties of direct measurements using eq X m = ∑ i = 1 n X i n σ = ∑ i = 1 n ( X i − X normalm ) 2 n − 1 ε = σ n ε f 2 = true( ∂ normalf ∂ X 1 true) 2 ε X 1 2 + true( ∂ normalf ∂ X 2 true) 2 ε X 2 2 + true( ∂ normalf ∂ X 3 true) 2 ε X 3 2 + ... + true( ∂ normalf ∂ X n true) 2 <...…”

Section: Methodsmentioning

confidence: 91%

“…The uncertainties of the direct measurements were calculated from the mean of the values and their respective standard deviations, conforming to eqs –. The uncertainties of the indirect measurements were estimated from the propagation of the uncertainties of direct measurements using eq where X i is the result of the i th measurement, X m is the arithmetic mean of the n results considered, σ is the standard deviation, ε is the uncertainty, and f is an indirect measurement f = f ( X 1 + X 2 + ... + X n ).…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Impacts of a New Drilling Fluid Invasion on Electrical Resistivity and Acoustic Velocity Measurements

Baggieri,

Carrasquilla,

Ceia

et al. 2024

Energy Fuels

View full text Add to dashboard Cite

When mud filtrate invades a geological formation, it alters its physicochemical characteristics. This invasive process divides the formation into four zones: mud cake, flushed zone, and transitional; immediately after that, there is a virgin area. Each of these zones contains a mixture of fluids: drilling fluids and original formation fluids. Thus, all well-logging measurements are influenced by mud filtrate invasion. The goal of this research was to analyze the effects of a new drilling fluid system invasion, crudeglycerin-based aqueous mud (CGBAM), when estimating a rock− fluid system's physical properties through electrical and sonic properties (V p and V s ). To accomplish this objective, resistivity and transit time laboratory measurements were performed on Berea sandstone samples under dry conditions and brine-and mud filtrate-saturated conditions. According to the results, the invasion of this aforementioned mud filtrate did not affect the characterization of sandstones through sonic properties. Although the crude-glycerin-based aqueous mud has rheological behavior like that of an oil-based mud, it presented unusual behavior from an electrical resistivity and sonic point of view. CGBAM showed sonic properties like the water-based mud and resistive behavior between oil-and water-based muds; therefore, it improves the drilling process and geophysical interpretation regarding the clear distinction between the oil and water zones of the reservoir.

show abstract

Section: Methodsmentioning

confidence: 91%

“…The uncertainties of the direct measurements were calculated from the mean of the values and their respective standard deviations, conforming to eqs –. The uncertainties of the indirect measurements were estimated from the propagation of the uncertainties of direct measurements using eq where X i is the result of the i th measurement, X m is the arithmetic mean of the n results considered, σ is the standard deviation, ε is the uncertainty, and f is an indirect measurement f = f ( X 1 + X 2 + ... + X n ).…”

Section: Methodsmentioning

confidence: 99%