Subsea Sampling Mitigation of ASD Failures During Commissioning of a New Oil/Gas Production Field
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Acoustic sand detectors (ASDs) for subsea well jumpers for a new oil/gas field failed to detect sand production rates during commissioning but rather was picking up ROV noise with potential impact on the integrity of infield piping and components. Erosion assessment using commingled sand content from topsides ASD indicated that erosion rate was insignificant. However, given that sand production was also expected to spike during the early production phase, subsea sampling (from the subsea sample vessel, located on the test header) was also required in order to determine sand production levels from individual wells, thereby informing the decision to bring on new wells and to determine the appropriate choke settings. Subsea sampling also gives the required information on H2S, CO2, Water chemistry, Water cut, Asphaltene, Wax and Radioactive tracers some of which are used for corrosion and for base management. This paper describes the activities required before, during and after subsea sampling, in addition to the testing scope and the reporting requirements for the test results. Availability of off-the-shelf technology for subsea sampling online instrumentation should assist resolution of similar commissioning failures.