Measuring and testing – Gas content of a liquid or a solid – Of mud
Reexamination Certificate
2005-09-06
2005-09-06
Raevis, Robert (Department: 2856)
Measuring and testing
Gas content of a liquid or a solid
Of mud
Reexamination Certificate
active
06938458
ABSTRACT:
An apparatus and system are disclosed for in situ measurement of downhole fluid flow using Doppler techniques. First, a baseline speed of sound is established as close to the desired measurement point as possible. This speed of sound measurement is then used in Doppler calculations for determining flow velocities based from induced Doppler shift resulting from fluid flow. A heterodyne receiver arrangement is preferably used for processing so that the flow direction can be determined and the detection sensitivity for low flow velocities can be enhanced. From in situ measurements, well kicks may be spotted and dealt with in real-time. In addition, current theoretical models of rheological properties may be verified and expounded upon using in situ downhole measurement techniques. Furthermore, the velocity measurements described herein can be used to recognize downhole lost circulation and/or gas/water/oil influxes as early as possible, even when the mud recirculation pumps are turned off.
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Beique Jean M.
Birchak James R.
Han Wei
Hemphill Alan T.
Rodney Paul F.
Conley & Rose, P.C.
Halliburton Energy Service,s Inc.
Raevis Robert
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