Reservoir to Refinery Webinar Series: Pitfalls in sampling and analysis of fluids for corrosivity assessments

Despite improvements in many fluid and chemical testing techniques over the past 30 years, the results of such testing can only be as good as the quality of samples that are collected for analysis. Experience suggests that up to 80% of results obtained do not accurately reflect in situ fluid compositions. In this webinar, we will discuss sample point design and location, and review the application of good sampling techniques.

Composition issues often result in a fluid sample that does not reflect the condition in the system at the point of sampling. Some of the common consequences of these issues include:

• Internal corrosivity assessments that do not accurately reflect the potential threat of failure
• Scaling assessments may over-estimate the scaling tendency of produced waters.
• High planktonic bacteria counts that are used for MIC assessments may over-estimate the potential threat.
• Low water-in-oil or BS&W results obtained from MOLs that do not correlate with the extensive internal corrosion observed from data collected by inline inspection tools (commonly observed).
• Elevated total suspended solids concentrations (TSS) and particle size distributions of liquid samples, collected from long, previously stagnant, sample lines, despite extensive flushing.

These issues all arise from poor sample point design and sampling techniques. This presentation provides an overview of the problems commonly encountered and how applying accepted and recommended practices could help to reduce the amount of poor data generated. This webinar may help engineers and chemists understand why some of the results of their predictions and assessments for corrosion or other production chemistry issues do not match up with those actually observed.

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