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Wax Disappearance Temperature (WDT) is the temperature at which the last wax solids are melted into liquid during a warming cycle.
Until now, trying to determine crude oil WAT or cloud point was an imprecise, tedious, and subjective process. Various manual methods have been tried, but all are difficult and time-consuming, yielding results with unacceptably wide error margins.
Phase Technology’s new WAT-70Xi analyzer revolutionizes the upstream and midstream oil industries with the world’s first and only totally automatic process to measure WAT and WDT of crudes. Based upon ASTM D5773, our proprietary optical light scattering technique detects phase changes with extreme sensitivity and accuracy.
This important scientific break-through means that even the darkest, most opaque samples can now be easily tested, with 1.0° C precision. The Phase Technology WAT-70Xi offers a considerable efficiency advantage—just load the sample, and the analyzer does the rest, with tests completed in just 20-40 minutes. There’s no time-consuming manual set-up needed, and cleaning is done automatically after each test.
Wax appearance temperature (WAT) and wax disappearance temperature (WDT) can help predict the occurrence of wax deposition in crude oils, and are therefore useful for upstream and midstream petroleum companies.
In oilfield applications, WAT or WDT can assist in determining optimum levels of wax crystal modifiers and/or wax deposition inhibitors. WAT is also an indicator of potential crude incompatibility and a monitor of evolving crude quality. Crude oils from the same region may have quite different characteristics, with disparate rates of wax deposition and dissolution. Changes of location, extraction depth, evolution of time, or even methods of production and blending can all be verified by WAT.
For transport of crude oil via pipeline, railway or tanker, as well as for oil storage, wax crystals may restrict flow or create a total blockage. WAT and WDT can help define acceptable operability limits and prevent the downtime and expense associated with cleaning. WAT is a useful tool for the accurate prediction of wax deposition in pipelines and storage vessels, resulting in great potential savings. The design and development of subseas and land pipeline systems and implementation of wax remediation options benefit from analysis of WAT data.