What Are SG Units? Oil & Gas Industry Explained

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SUMMARY

The discussion focuses on the use of specific gravity (s.g.) units in the oil and gas industry, particularly in relation to a model for sand production and wellbore collapse. Participants clarify that s.g. is used to express stresses and pressures, with values ranging from 0.4 s.g. for cohesive rock strength to 1.88 s.g. for overburden stress at a depth of 1.2 km. The correct conversion factor for these units is identified as static pressure gradient, measured in psi/ft. Understanding these units is crucial for accurate modeling in the industry.

PREREQUISITES
  • Understanding of specific gravity (s.g.) in geomechanics
  • Familiarity with pressure units in the oil and gas industry
  • Knowledge of wellbore stability and sand production concepts
  • Basic understanding of static pressure gradient calculations
NEXT STEPS
  • Research the application of specific gravity in geomechanical modeling
  • Learn about static pressure gradient calculations in oil and gas
  • Explore cohesive rock strength and its impact on wellbore stability
  • Investigate conversion factors between s.g. and conventional pressure units
USEFUL FOR

Geologists, petroleum engineers, and professionals involved in modeling sand production and wellbore stability in the oil and gas sector will benefit from this discussion.

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Hi all,

I am currently trying to understand a paper which presents a model for sand production and wellbore collapse in the oil&gas industry.

The paper refers to stresses and pressure in "s.g." instead of Pa or other pressure/stress units... values tend to range from 0.4 s.g. for cohesive rock strength to 1.88 s.g. overburden stress at 1.2km depth.

Anybody knows what those units are ? I seem to get correct values when inputting my own data in Pa. But I wanted to make sure I wasn't missing out a conversion factor.

Thank you
 
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