Measuring and testing – Borehole or drilling – Fluid flow measuring or fluid analysis
Patent
1998-05-15
2000-05-09
Raevis, Robert
Measuring and testing
Borehole or drilling
Fluid flow measuring or fluid analysis
E21B 4900
Patent
active
060587733
ABSTRACT:
A flow-control apparatus enables the taking of representative formation samples at sampling rates less than 10 cc/sec in typical high pressure wells, e.g., to 20,000 psi. Throttle valves are used to control pressure drawdown in the flowline and to continue that pressure control until captured in a sample chamber. Very low flow rates at high pressures are made possible by using a motor-driven, variable orifice, needle valve (throttle valve) and a downhole feedback loop on the piston position. The flow control device uses metered fluid, which is internally contained oil, which overcomes the difficulty of trying to meter "dirty" (particle laden) well fluids or dual phase gas-liquid fluids. A single probe module (or a dual packer) is coupled with a multi-sample module and the flow control module. This combination can then be used to draw a sample from the formation at a very low flowrate and, hence, a very low pressure differential which keeps the sample pressure above the bubble point (or dew point). In a gas well with condensates or volatile oil, this procedure is extremely important since the sample will contain a realistic fraction of the liquids in the well. If the flowline pressure is dropped below the dew point, the gas expands and fills the sample chamber, leaving the liquids behind and an unrepresentative sample is obtained. The present invention provides the unique ability to obtain a quality sample from low permeability, high pressure formations.
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Harrigan Edward
Zimmerman Robert P.
Christian Steven L.
Jeffery Brigitte L.
Raevis Robert
Ryberg John J.
Schlumberger Technology Corporation
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