Total plans to abandon two wells permanently in the Lapa field, in the Santos Basin pre-salt. The information was confirmed by the ANP after contact made by BE Petróleo.
One of the wells – which had a useful life expected to end this year, according to studies of corrosion prepared by Petrobras (former operator of the asset) – showed a failure in the sub-surface safety valve.
According to the ANP, a Christmas tree is supplying the absence of the valve, but the equipment is considered a degraded security element, which has required “a differentiated monitoring campaign and covered by risk management.”
The agency added that the production of the reservoir by the well is beneficial because it reduces its pressure, facilitating and making less permanent risk of abandonment.
In relation to the second well, it was found, during routine inspection, slope above the seabed due to the decoupling of the housings of low and high pressures.
Although the slope did not compromise safety barriers, Total decided to stop the production of the well and carry out an intervention to displace a cement plug in order to isolate the reservoir.
Scheduled for Feb. 2, the operation provides for the installation of submarine equipment, such as manifold and treecap.
The ANP pointed out that it has monitored Total’s actions, evaluating the risk analysis performed for the intervention and verifying the control measures adopted from the point of view of operational safety and maintenance of well integrity.
“In addition, as a precautionary measure, the ANP temporarily authorized the shutdown of the injector wells to avoid increasing pressure in the well during the intervention,” the agency added.
According to the ANP, there is no forecast of production interruption in the other wells in Lapa, whose production is done by FPSO Cidade de Caraguatatuba. The unit has the capacity to produce 100,000 bopd and compress up to 5 million m³ / d of natural gas.
Total officially took over the field operation in January 2018, a month in which the production recorded in the asset was 45,977 thousand bopd, being 28,165 thousand boed by the 7-LPA-1D-SPS well and 17,812 thousand by the 8-LPA-2D- SPS.
Last December, however, the total volume extracted was 33,573 thousand bopd (-27% compared to January), 20,014 thousand for 8-LPA-2D-SPS and 13,559 thousand bopd for 3-BRSA-861-SPS.
Total did not respond to the contact made by the report until the moment of publication of the article.
Source: Brazil Energy Magazine