Zion Oil & Gas Inc (ZNOG)

[KyOil]

Shouldbe, the downhole pressure is calculated during drilling and measured after drilling. I have a simple redneck method for continuously measuring it during production!

During drilling
The mud weight is adjusted to balance with the formation pressure and this weight times the known hole depth gives pressure at the bottom. If the mud weight is too heavy, then the mud will flow into the formation and not return to the surface. The mud weight is then lowered until balance is found (add water or gas). If the mud weight is too light, then oil and gas will exit the wellbore at the surface. To balance, a heavy component like Barite is added.

https://en.wikipedia.org/wiki/Drilling_fluid

After Drilling
The wellbore fluid is brought into balance similarly to adjusting the mud weight. In other words, the wellbore fluid level is not changing. Then a pressure/temperature sensor is lowered on a wireline to the bottom and a recording is made. This can be done with wellhead pressure or not. The shortfall of this method is that different zones have different formation pressures so it may not be possible to get the wellbore fluid to a certain weight (i.e. specific gravity) to balance.

A more advanced method, and likely done on MJ#1 at various zones of interest, is a micro measurement tool which measures the formation pressure with a probe.

http://www.glossary.oilfield.slb.com/en/Terms/w/wireline_formation_tester.aspx

During Production
Managing flow rate overtime is important to maximizing a wells output. And pressure changes is critical info for managing flow rate. I couldn't afford the sophisticated measurement tools so invented one! It has no moving parts nor electronics downhole, and gives the wellbore pressure at the zone of interest while pumping.