This type of testing is widely used in the oil and gas industry when examining filtration flows and assessing current state of field development. SIAM Company has provided services for well-to-well tracer testing starting with conventional tracer testing, gradually increasing a number of chemicals to conduct tracer testing as well as a range of tasks to be solved with tracer testing for more than 10 years. Over the last 3 years the company has focused on studies of residual-oil saturation determination -Single Well Chemical Tracer Tests (SWCTT).
One of the main challenges solved by an oil producing company is advancing reservoir performance and enhanced oil recovery. In this case, to get information about qualitative and exact characteristics of producing formation at all development stages is of great importance. Given the complexity of secondary production systems and widely used new enhanced oil recovery methods, determining filtration flow direction in producing formation is relevant.
Tracer testing is one of the most detailed analyses in terms of flooding monitoring. It allows getting qualitative and reliable information, examining and quantifying reservoir properties.
Methodology of reservoir properties study on fluid influx in borehole environment using tracing is based on creating stationary source of label spread in borehole environment of a particular producing well. At every stage of multiphase fracturing, portions of technical water injected into the well through every frac port are labelled with various water soluble chemicals. From the start of operating of traced frac port, regular sampling of produced fluid and subsequent analysis of the presence of injected tracer in it are performed. As the result of analytical interpretation of obtained data, performance parameters of all frac ports under study are defined.
Before conducting enhanced oil recovery, it is essential to estimate its potential efficiency and to prove the resulting activity efficiency after that. It is done by estimating changes in residual-oil saturation of formation pay zone. Single-Well Chemical Tracer Test (SWCTT) is one of the technologies to estimate residual-oil saturation of formation pay zone. The procedure means injecting oil-soluble and water-soluble tracers into a reservoir and their subsequent holding for some time near the bore of a producing well.
After a certain period of time a well starts producing, at the same time samples are taken at the wellhead and analyzed for the tracers presence in the chemical analysis laboratory. Time difference of oil-soluble tracer returning allows calculating oil saturation of formation pay zone while interpreting obtained concentration of tracers.
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