Case Studies of an Effective Methodology to Collect Formation Water to Meet Regulatory Requirements for Formation Water Sampling
- V. H. Tran (Chevron Corporation) | N. Arismendi (Chevron Corporation) | T. Biswas (Chevron Corporation)
- Document ID
- Society of Petroleum Engineers
- SPE Western Regional Meeting, 22-26 April, Garden Grove, California, USA
- Publication Date
- Document Type
- Conference Paper
- 2018. Society of Petroleum Engineers
- 4.2 Pipelines, Flowlines and Risers, 5.2 Reservoir Fluid Dynamics, 4.2 Pipelines, Flowlines and Risers, 5.2 Reservoir Fluid Dynamics
- MDT, RDT, Modular Dynamic Tester, Reservoir Description Tool, Live Fluid Analyzer, Fluid Indentification Section, Formation Water Sampling, LFA, FLID
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New underground injection control (UIC) regulatory activity come with challenges. California regulatory agencies have enhanced scrutiny on underground injection projects. One of the requirements under the California UIC regulations is to collect formation water samples and submit water analysis results together with the application package to confirm whether the Total Dissolved Solids (TDS) of a formation or aquifer is greater than 10,000 ppm, which is non-underground source of drinking water (non-USDW) under the federal Safe Drinking Water Act (SDWA).
Various methodologies for collecting water samples were evaluated before selecting wireline tools, to collect water samples. The water samples were collected open-hole using downhole special wireline equipment with high technologies to analyze/detect not only fluid types being pumped through tool's flowline but also the contamination levels (due to mud filtrate invasion), to prove the representative formation fluid quality of the collected samples.
This paper summarizes water sampling methods using two different types of wirelines sampling tools from two different leading wireline contractors. Depending on the key sensors each tool has, strategies to detect contamination levels were studied and developed. The following executions and on-the-fly decision making have proved this sampling method is the most suitable and cost-effective for the specific regulatory required sampling.
Formation water samples were successfully collected with monitored contamination levels to prove the accuracy of the formation TDS of this sampling method compared to the log-derived TDS. This crucial data helps demonstrate the TDS and water quality in order to comply with California UIC requirements.
This is a new sampling method that had never been used in the San Joaquin Valley region for formation water sampling. Despite initial concerns from regulatory agencies about the accuracy of this method, the regulators have not only accepted this formation water sampling technology, but now advocate for its use by other operators.
|File Size||2 MB||Number of Pages||17|
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