Publications

CT fishing job is one of the most common methods for fishing. CT operation with the well already killed with liquid before the operation, is the most common option for CT fishing. Following CT fishing job, a well clean-up operation is usually required. However, it will be very challenging if it is required to perform a fishing job in a life and deep gas well, with a significantly heavy fish where it is required to catch/release the fish and at the same time with a requirement to have no formation damage. The field has been on production for over a decade and as a result the reservoir is highly depleted. There are very limited fishing options for achieving high pulling capability with this zero-formation damage requirement. Due to a significant impact to the gas production by removing the fish (stuck TCP gun across the perforation interval) without introducing any liquid, there was potential benefit in employing an alternative methodology. One method investigated to achieve zero formation damage was to pump N2, instead of liquid, to activate CT Flow Release Tool (FRT) for releasing fish. A multi-disciplinary team has reviewed and recommending for a CT Fishing by using FRT and activated with N2 method to remove a total of ~267’ ft 4.5” OD TCP gun. The review of using FRT with N2 is performed by doing System Integration Test (SIT), to verify the use of this technique and is the key contributing factors for this method selection. Also, the learning from experience of doing similar operation in other operators, optimum tool BHA configuration has been instrumental for this process review. An intensive Hazard Operability (HAZOP) study also conducted to assess risks and hazards associated with pumping operations of high-pressure nitrogen gas to the CT string. Finally, 3 CT fishing runs completed and successfully removing stuck fish 267 ft of 4.5” OD TCP across perforation interval.