The preeminent custody transfer method for the transfer of process fluids in lease gathering operations is through the use of a LACT. Learn more about the history of LACTs.
LACT units use pumps, flow meters and other instruments to measure volume, determine oil quality, and sample the oil produced. These units perform the following basic functions:
- Transfers oil from the lease to the truck, pipeline, or other tankage
- Monitor and sample the amount of sediment and water in the oil (non-merchantable oil)
- Eliminate air or gas from the liquid as long as it is not entrained in the liquid
- Pull a representative sample of the liquid going through the system
- Measures the volume of liquid going through the unit
- Maintains constant back pressure and flow rate
- Operates automatically or semi-automatically
Crude oil is sold on the basis of temperature, API Gravity, and the BS&W content so it is very important to have accurate measurements. Typical crude oil will expand and contract at a rate of 2% per 40°F and as such temperature has the greatest affect on volume. The accumulation of errors in tank gauging can be as much as 1% which over a large volume and multiple tanks can be quite significant.
The most effective and simplest way for custody transfer of liquid hydrocarbons between and producer and buyer is by using an accurate flow meter. A liquid flow meter is capable of maintaining an accuracy of 0.25% or better with the aid of additional flow conditioning components.
Valin provides complete integration of all these devices into one complete, deliverable package. Learn More