Trinidad production rate forecasts.15 Mar 2026 00:12
I did not make these by rolling dice, please bear with me since this could be a rather long-winded explanation. It is necessary to understand that production rates from all wells decrease over time. About 80 years ago a forerunner of today's reservoir engineers named JJ Arps proposed some formulae which have been used ever since, with subsequent modifications. The most commonly applied is the Arps Hyperbolic Decline Equation. This demonstrates that production decline is not a straight line, but a hyperbolic curve, steep to begin with, then declining more gently over time, until the decline rate is very low. Prime factors affecting decline rates are reservoir initial pressure, volume & permeability, and oil viscosity. Snowcap scores well for all these parameters.
For the SC-3 ITR, SGL have suggested a conservative stabilised rate of 500bopd based on historic wells flow rates, with a high estimate of 1-2000 bopd. (pp18-19). Decline rates used are 35% first year, 20% 2nd year (p.22). To get to a rate of roughly 500bopd by end year 2, it is necessary to start with 1000bopd IP rate (1000-35%=650, 650-20%=520).
All new wells will have these declines. Workovers of existing producers will result in a reset of the decline curve – obviously if the field is substantially depleted, the reset will be from a much lower re-start rate. So, what I have is a spreadsheet of many overlapping declining production curves. The higher the rate of new or workover wells, the higher the overall production growth of the Trinidad assets. I have assumed that the rate of new or reworked wells will be one every two weeks, with average IP of 25 bopd per well, derived from the numbers given in the RNS of 07 & 22 Jan 2026 for the planned work for H1 this year. These numbers exclude future work on the Innis-Trinity and Icacos fields, which will start H2, and of course from Cory-Moruga, where SC-3 will come on stream at the start of H2, and SC-4 a couple of months later. The spreadsheet totals are those I have used in my Trinidad calculations.
I recall someone suggesting that the SC-3 forecasts were unrealistic, based on SC-1 results. It should be recalled that SC-1 suffered from waxing, and that “Oils tested in SC-1 were found to contain a component of wax which is common to oils in the area sourced from Cretaceous shales. PRD therefore have a plan in place to undertake chemical injection if waxy oil required intervention.” ITR, p.22.
Eventually (after 2-5 years?) PRD will run out of new locations, and production will plateau, unless gas re-injection, CO2EOR, etc are used. That would be a good point to sell the assets – PG has stated that Trinidad is unusual in that local investors pay according to flow rates rather than reserves. I think it unlikely that multinationals will be interested in a bunch of small mature fields producing perhaps 5000bopd in total. If there is real potential for deep oil in Cory-Moruga, that may change this view.