A little Background info6 Aug 2021 13:56
The Eastern Venezuela Basin is a major sedimentary basin in northeastern Venezuela that contains copious petroleum reserves. The basin lies between several geological structures. To the south it bounds Guiana Shield, to the north metamorphic rocks of the easternmost Andes, to the west the Espino Graben, to the northeast the Barbados accretionary complex and to the east it bounds to the oceanic crust of the Atlantic Ocean.[1]
CERPS most exciting opportunity is its onshore position in Trinidad’s South West Peninsula (SWP). The SWP is close to, and geologically part of, the East Venezuelan Basin. This is the largest hydrocarbon basin in the world. Koot says the opportunity to access the Basin’s offshore-scale potential from an onshore location drew him to Columbus:
‘Trinidad has been producing for a long time. However, the SWP has not. This is because landowners rather than the state own its mineral rights. Oil companies have overlooked these resources .
Cerps first well that they drilled in the SWP Saffron 1 was never planned as a production well always an exploration well until they found oil at only 450'.
3 zones in the Middle Cruse with one having a gross pay of 1,000' interval 4 with minor sand migration ( a big plus) and 60 wells planned.
The MC is over pressured at 0.6psi and at those depths is very high.
Pressures increase the deeper the layers at about 1lb per foot in rock and less with water e.g. undersea.
The Lower Cruse had the issues with moving shales and a heavy mud was used which had the effect of hampering the flow of the oil and was abandoned and only 2 x 8' zones were perforated but had an API of 40, that's fantastic, over 300' still to perforate of "open" flowing sands.
The 2 zones 5&6 had pressures of 0.7 & 0.9 psi. As i understand it a pressure at that depth is very high and should flow unaided for a long time.
This well has given Cerp so much potential although as I understand it only a minimal amount of oil has been produced from the middle cruse due to 90% water cut although for future growth the economics make it potentially far better than sub sea plays.
Now we are flow testing S2 on which a synthetic mud was employed along with a different casing method so hopefully a better outcome will be achieved.