The well was spudded on 12 March using the Transocean GSF Monitor jack-up drilling rig, and is the first of an overall three well drilling programme on CI-202 permit.
The well has been drilled to a depth of 1070m, at which point the drill-pipe became stuck and mechanical problems with the rig equipment occurred which have since been rectified by the drilling contractor, Transocean.
Operations are currently underway to free the stuck drill pipe.
Rialto chief operating officer Charlie Nieto said, "Fishing operations started over the weekend with resumption of drilling expected in the next few days."
The well is anticipated to take six months to complete, together with testing.
Rialto, as the operator, holds an 85% working interest in CI-202.
