Vertical Flowmeter Test
Exploration Technique: Vertical Flowmeter Test
|Exploration Technique Information|
|Exploration Group:||Downhole Techniques|
|Exploration Sub Group:||Well Testing Techniques|
|Parent Exploration Technique:||Well Testing Techniques|
|Information Provided by Technique|
|Hydrological:||Define permeable zones within a well|
A vertical flowmeter test is also known as a spinner test and is preformed to locate zones of permeability in a well. The tools used to measure flow in the well are often equipped measure pressure and temperature too. A flowmeter test is standard to perform in geothermal wells upon completion of the well.
Flowmeter tests are performed to find permeable zones in a well and to quantify the amount of fluid flow into or out of the well. A flowmeter test is usually done in conjunction with Pressure and temperature logging.
A related test is called cross-hole flowmeter profiling. A flowmeter is lowered into one borehole and fluid is either pumped into or out of an adjacent borehole. The flow induced in one well from the pumping of fluid in the other well gives information about the formation between the two wells. This type of test can identify cross hole connections and provide data that can be used for calculating transmissivity, head, and the storage coefficient of the formation between the two wells.
There are three main types of vertical flow meters which are small simple tools. There is the head-pulse flowmeter (figure a), the electromagnetic flowmeter (figure b), and the spinner flowmeter (figure c). Each tool is relatively simple and can be used as either a real time electric wireline tool or a slick line memory tool. Usually pressure and temperature transducers are incorporated into the instrument.
Vertical flowmeter tests are usually run at two or three different pumping rates as well as zero pumping rate, so that areas of inflow and outflow within the well can be better characterized. The data is also best for identifying permeable zones when correlated with temperature and pressure data.
A spinner flowmeter has poor resolution at very low flow rates, so it is limited to wells with higher flow conditions.
- Hagen Hole. 2008. Geothermal Well Completion Tests. In: Petroleum Engineering Summer School; 2008/06/09; Dubrovnik, Croatia. N/A: N/A; p. N/A
- U.S. Geological Survey. Vertical Flowmeter Logging [Internet]. 2013. USGS Groundwater Information: Branch of Geophysics. [cited 2013/10/17]. Available from: http://water.usgs.gov/ogw/bgas/flowmeter/
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