Methods to prevent oil theft from well site

[AbySa]

One of our clients is facing problem of oil theft from well site. They believe that well produces more but reported oil volume is less.
All wells produce from 25bbl/day to 300 bbl/day. Oil gets collected in tank on the well site. The gas gets released from tank. Then a tanker comes and collect the oil from tank and goes to nearby processing plant.

As of today* they have put meters just after Xmas tree. These meters transfer values over internet to their head office. They still feel that there is leakage somewhere. What additional or better equipment's and processes they can setup ? Please share some examples and case studies.

For better understanding here is the link to the question

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[mh_mahmoodieh]

Hi
for being sure how many barrel you are producing you can do this way:
injecting a certain amount of a tracing chemical at the beginning and measuring tracing chemical at the end.
for example injecting certain amount of water and measuring it at tank.
by this you can understand your metering has problem or there is a thief/