DRC provides our clients with two primary services: rental of the SPIDR hardware and our proprietary conversion algorithms which allow us to accurately model wellhead pressure (WHP) to bottomhole (BHP) conditions. While these two services are frequently used together, they can just as easily be used individually. This site is designed to provide more information about these two distinct services. If you have any questions or need assistance please contact
The SPIDR Hardware
The SPIDR was originally designed in the early 1980s and at the time was one of the only digital wellhead pressure gauges in existence. Over the years we have continuously modified the SPIDR as new technology became available (i.e. better pressure transducers, larger data storage capacities, and USB communication). The SPIDR is in a state of continuous improvement, so that we can continue to provide the highest quality wellhead pressure gauge in the Industry. The SPIDR gauge incorporates a Quartzdyne dual-quartz transducer which is considered the best quality transducer in the oilfield today. For any use of surface pressure data for pressure transient analysis, whether via a pressure build-up, multi-rate or injection fall-off, it is of paramount importance to utilize a quartz type transducer. This is because these transducers advantages in pressure resolution, data frequency, stability in changing thermal conditions, etc.
Converting Wellhead Pressure to Bottomhole Conditions
DRC was originally founded to provide operators with an alternative to using downhole pressure gauges for well testing. In its infancy DRC simply used existing industry models (such as Cullender & Smith) to model surface pressures to bottomhole pressure. We realized early on that these models were lacking especially as the amount of fluid that a well produces increases. To be able to truly provide this service, DRC needed to develop its own models so that our technology could be used on a wider range of wells. To come up with these new models we began offering the SPIDR to operators free of charge during their well tests so that we could perform a direct comparison between our converted SPIDR data and the actual downhole pressure data. By performing these trial comparison tests over the years, DRC was able to use empirical data to create what we believe to be the most accurate models for converting wellhead pressure to bottomhole conditions in the industry.
DRC markets its conversion algorithm technology for: Single phase gas
and oil or Multiphase gas producers in critical flow that have a
constant mass flow (no slugging). DRC routinely converts SPIDR acquired
data but increasingly we are asked by our customers to convert
historical pressure data from various sources such as SCADA, Subsea Tree Gauge,
other surface measurement devices. We first must perform a quality check on
the non-SPIDR data to make sure that the data set has the required
sample frequency, resolution and thermal stability required for using
surface measurements for pressure transient analysis.