Two-Rate

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The two-rate flowing test yields most of the same information as a build-up test, but without a shut-in.

The two-rate test requires the flow rate of the well to be changed after an extended stable flow period. If the flow rate is decreased, it must still be at a rate sufficient to continuously unload produced fluids. The flow rates and wellhead pressures before and after the change must be monitored closely. The SPIDR can simultaneously measure flow rates and wellhead pressures when installed at the wellhead as shown on the left.


Two Rate Tech Alert

May. 3rd, 2005 07:36 pm

However, with wells producing fluids, there may be a lack of knowledge regarding the presence of fluids in the well bore after shut-in. If fluids are present after shut-in, the surface pressure may not be accurately converted to bottom-hole pressure and use of the SPIDR would be precluded.When doubts exist as to the presence of a fluid column after shut-in, SPIDR users have elected to use a 2-rate flowing test which eliminates concerns about fluid accumulation in the well bore. The 2-rate test ... read more
 
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