Analysis
TotalEnergies’s September 10 announcement links the June Acacia-5 discovery to planned fast-track development using Pazflor capacity. Its anticipated 6,000-barrel-per-day increase concerns Block 17 and supplies no measured decline history for an individual well. A nearby host can shorten the infrastructure route, but neither distance nor an announced increment determines how long a producing stream retains its initial rate. The following illustration is independent of that project.
Define an assumed instantaneous rate q(t) = q₀ exp(−Dt), where q₀ is 1,000 barrels per day, t is years and D is an assumed continuous decline coefficient in inverse years. This is an author-defined mathematical curve, not a fitted reservoir model. At D = 0.10, 0.20 or 0.30 per year, one-year rate retention is exp(−D), so effective annual losses are approximately 9.52%, 18.13% and 25.92%. Calling D itself the effective annual percentage would mix two definitions.
For a five-year window, integrate the rate: N = 365q₀[1−exp(−5D)]/D barrels, assuming 365 days per year and ignoring leap days. The three cases give approximately 1,436,163, 1,153,620 and 945,192 barrels. Holding the initial rate flat would instead give 1,825,000 barrels. Year-five instantaneous rates are about 606.5, 367.9 and 223.1 barrels per day. The chart displays technical cumulative volume over the same window, without an economic shut-in rule.
A separate economic illustration assumes a constant USD 20 per barrel contribution after variable costs and USD 5,000 of avoidable fixed operating cost per day. Daily contribution covers that fixed cost at 250 barrels per day. Setting q(t) to this threshold gives t = ln(4)/D: approximately 13.86, 6.93 or 4.62 years. Thus the highest-decline case crosses the assumed operating threshold before year five, even though the technical curve continues. Its chart volume includes that later interval and is not economically truncated.
These assumptions are neither actual prices nor TotalEnergies costs, profit or a forecast. The example excludes capital spending, taxes, discounting, shared-host allocation and abandonment obligations. Avoidable costs may differ from allocated costs, and contracts or reservoir management may alter a cessation decision. Real rates can depart from exponential decline through pressure support, constraints or interventions. Applying any horizon to Acacia-5 would require dated production histories, reservoir evidence, host limits and project-specific cost responsibilities; none is inferred from the announcement.