Gravity instruments: Past, present, future

Chapin, David A.

doi:10.1190/1.1437806

Cited by 37 publications

(19 citation statements)

References 1 publication

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“…A comprehensive overview about gravimeters is given by Chapin (1998). The past century was characterized by technological developments increasing the accuracy of the instruments by four decades.…”

Section: Gravimetersmentioning

confidence: 99%

Groundwater Geophysics

2009

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Section: Gravimetersmentioning

confidence: 99%

Groundwater Geophysics

2009

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“…Field instrumentation and measurement techniques are drastically different, as is the consequent data interpretation based on the mathematics of potential fields rather than on wave propagation (Chapin, 1998). Field instrumentation and measurement techniques are drastically different, as is the consequent data interpretation based on the mathematics of potential fields rather than on wave propagation (Chapin, 1998).…”

Section: Background Commentarymentioning

confidence: 99%

Geophysics in the Affairs of Mankind

Lawyer¹,

Bates²,

Rice³

2001

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“…There are many types of gravity sensors 6 . The most common are comprised of a mass suspended by a spring.…”

Section: Borehole Gravity In Horizontal Wellsmentioning

confidence: 99%

“…A borehole gravity survey reports the bulk density ρ, which changes when oil is produced. The density depends on the volumes and densities of the solid and fluid components of the reservoir: ρ = (1-φ)ρ ma + φS w ρ w + φS o ρ o + φS g ρ g (6) where φ is the formation porosity; ρ ma , ρ w , ρ o , and ρ g are the densities of matrix, water, oil, and gas respectively; and S w , S o , and S g are water, oil, and gas saturations, respectively. As production continues, saturations and formation density change.…”

Section: Borehole Gravity In Horizontal Wellsmentioning

confidence: 99%

Improved Production Log Interpretation in Horizontal Wells Using a Combination of Pulsed Neutron Logs, Quantitative Temperature Log Analysis, Time Lapse LWD Resistivity Logs and Borehole Gravity

Brady

Watson

Warner

et al. 1998

Proceedings of SPE International Oil and Gas Conference and Exhibition in China

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractA novel combination of logs and their unique interpretations are used to improve the understanding of production in horizontal wells on the North Slope of Alaska. Two techniques using Pulse Neutron Capture (PNC) logs to identify and quantify liquid productive intervals were previously presented in a paper by Brady et. al 1 . These techniques are compared and combined with two additional techniques: 1) the use of time lapse LWD resistivity to determine productive intervals and liquid flow profiles while drilling, and 2) a non trial-and-error method to determine quantitative gas production using temperature logs in a twophase flow. Finally, modeling shows borehole gravity logs can be used to track the vertical movement of gas or water tens of feet above or below horizontal wells.Integrating the time lapse differences between shallow LWD resistivity logs run while drilling and logs run several hours after drilling show a strong correlation with PNC liquid flow profiles for wells producing at solution GOR. Additionally, combining a quantitative gas flow rate analysis from the temperature log with the liquid profile provides a complete analysis of the production profile for two-phase flow in horizontal wells. Finally by combining the production profile analysis from a horizontal well with the modeled timelapse borehole gravity data, a complete understanding of the fluid movements in the well borehole and up to two hundred feet into the formation can be obtained.These techniques can be applied to both horizontal and vertical wells with both slotted liner and cemented perforated completions to obtain a quantitative production profile. The LWD resistivity data, collected while drilling, provides an indication of the productive reservoir rock before the well is completed. Time lapse borehole gravity provides an understanding of the reservoir fluid movements affecting the wellbore flow profiles after the well has been put on production.

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Gravity instruments: Past, present, future

Cited by 37 publications

References 1 publication

Groundwater Geophysics

Groundwater Geophysics

Geophysics in the Affairs of Mankind

Improved Production Log Interpretation in Horizontal Wells Using a Combination of Pulsed Neutron Logs, Quantitative Temperature Log Analysis, Time Lapse LWD Resistivity Logs and Borehole Gravity

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