# What is ODT in oil and gas?

## What is ODT in oil and gas?

Words in this image: GWC: Gas/water contact, GOC: Gas/oil contact, GDT: Gas down to, GUT: Gas up to, GLC: Gas/liquid contact, OWC: Oil/water contact, ODT: Oil down to, OUT: Oil up to, OLC: Oil/liquid contact, WDT: Water down to, WUT: Water up to, OOWC: Original oil/water contact, FWL: Free water level, HDT: …

## What is GOC and OWC?

Defining the depths of the fluid contacts, gas/water contact (GWC), oil/water contact (OWC), and gas/oil contact (GOC), or defining both of the latter in some reservoir situations, is essential for volumetrics calculations and important for detailed petrophysical calculations.

What is the difference between OWC and FWL?

The difference between the OWC and the FWL is greater in tight reservoirs, and may be up to 100m difference. A difference between GOC and free oil level exists for the same reasons, but is much smaller, and is often neglected.

### What is undersaturated reservoir?

As we discussed in Lesson 2, an undersaturated oil reservoir is defined as a reservoir in which the initial pressure is greater that the bubble-point pressure of the crude oil. This results in a single, liquid hydrocarbon phase in the reservoir.

### How is free water level calculated?

Figure 1 Easy method for determining free-water level (FWLfeet from west line) by projecting RFT pressure data downward from a reservoir to the aquifer. An easy method for determining free water level (FWLfeet from west line) is projecting RFT pressure data downward from a reservoir to the aquifer.

How is capillary pressure calculated?

Capillary pressure is defined as Pc=Pnw−Pw and for water saturation decreasing, Pnw outside the pore throat is greater than Pw inside the pore throat, resulting in a positive pressure.

## What is undersaturated oil?

PetroWiki. An oil with less gas than its solubility capacity.

## What is the difference between undersaturated and saturated oil reservoir?

Undersaturated: Reservoir pressure > bubble point of oil. Saturated: Reservoir pressure ≤ bubble point of oil. For an undersaturated reservoir no free gas exists until the reservoir pressure falls below the bubblepoint. When the gas comes out of solution the oil (and water) shrink slightly.

What is free water level in oil and gas?

The free water surface is the highest elevation with the same oil and water pressure (zero capillary pressure). The free water level is the highest elevation at which the pressure of the hydrocarbon phase is the same as that of water.

### Is capillary pressure high or low?

Capillaroscopy has been used to visualize capillaries in the skin in 2D, and has been reported to observe an average range of capillary pressure of 10.5 to 22.5 mmHg in humans, and an increase in pressure among people with type 1 diabetes and hypertension.

### What is normal capillary pressure?

Normal capillary pressure, measured at the apex of the capillary loop with the capillary at heart level, ranges from 10.5 to 22.5 mmHg (Figure 4). It is lower in premenopausal women than in postmenopausal women or in men and does not correlate with brachial artery blood pressure.