What Are SG Units? Oil & Gas Industry Explained

[Sorade]

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

 

[Nidum]

Static Pressure Gradient

Units psi/ft

 

[Huyen401]

Hi there,

From my understanding, "s.g." stands for specific gravity, which is a unitless measurement that compares the density of a substance to the density of water. In this case, it seems like the paper is using specific gravity as a way to compare the stress and pressure values to the density of water.

If you are inputting your own data in Pa and getting correct values, then it is likely that the paper is using a conversion factor to convert the specific gravity values to Pa. However, it is always a good idea to double check and make sure that you are using the correct units in your calculations. I would recommend reaching out to the authors of the paper for clarification on the conversion factor or any other questions you may have.

Hope this helps!