An offshore gas well was producing water at an excessive level of 1,700 B/D and required immediate remediation. Because other depth-correlation techniques could not offer the real-time correlation and critical accuracy needed to perforate an interval within 10 ft of a water zone, the DepthLOG* coiled tubing service was used. DepthLOG correlation enabled isolation of the water zone and accurate placement of the new perforations, leading to increased produc-tion at reduced cost. A 60% increase in gas production to 800 Mscf/D from 500 Mscf/D was achieved. Water production was reduced from 1,700 B/D to 900 B/D, also leading to significant savings in surface handling and processing.
To shut off the water-producing zone, an inflatable packer was run on wireline through the 31â2-in. completion and set as a bridge plug in the 5-in. liner. On the first perforating run, depth was correlated by tagging the packer; perforating guns were run on CT to just 140 ft above the packer and fired.