Custody transfer: the figure that counts

When a tanker truck leaves a depot, when crude enters a pipeline, when a cargo is pumped towards a ship, one question sounds trivial and is not: how much, exactly? The seller has an answer, the buyer has another, and the gap between the two quickly adds up to millions. So the industry invented a ritual: at one precise contractual point, a calibrated instrument measures the product, and that figure, and that figure alone, is binding. That is custody transfer.

A meter worth its weight in gold

A custody meter is no ordinary meter. It is calibrated against a certified reference, re-checked at short intervals (the operation is called proving), and the measurement is corrected for temperature and pressure back to standard conditions — because a warm litre is not a cold litre. Add sampling: water and sediment content, density, sulphur. The typical requirement is counted in tenths of a percent, where an operational meter settles for a few percent.

Why such rigour? Do the maths

Take a modest flow of 25,000 barrels a day at 70 dollars. A measurement error of 0.1% — invisible to the eye, within the tolerance of many ordinary instruments — is 25 barrels a day, or 1,750 dollars daily: over half a million dollars a year, lost or gained depending on which side of the meter you stand. At the scale of a national export corridor, every tenth of a percent is a budget line.

Shrinkage, the loss that has a contract

Between two custody meterings, volume moves: evaporation, residues clinging to tank walls, thermal swings. The industry calls this loss shrinkage, and treats it like a lawyer would: a contractual threshold tolerates it, beyond which it becomes an anomaly to explain — a leak, a metering error or a diversion. A drifting shrinkage figure is often the first visible symptom of an invisible problem. Metering is not an accounting formality: it is an integrity instrument.

And for Chad?

Chadian crude travels 1,070 km to the Cameroonian coast — the corridor told in our Doba–Kribi story. At the departure from the basin and at the arrival terminal, meterings measure every exported barrel: the State’s petroleum revenue rests on those figures, and they are what EITI transparency reports reconcile against company declarations. Petroleum sovereignty begins with mastering measurement: a country that does not count its own oil takes its partner’s word for it.

EnerTchad’s stance: count at every link

An integrated chain — production, transport, depots, stations — is a chain of internal and external custody transfers. Our target discipline is simple: a calibrated metering at every interface, from well to truck, from depot to station, with proven instruments and shrinkage gaps tracked like safety indicators. It is the natural extension of what this site has argued since its first story: the true figure serves better than the flattering one — and the true figure is born at the meter.