Adjustment of mud circulation when evaluating a formation
AssigneeSchlumberger Technology Corporation
InventorsSteven G. Villreal, Julian J. Pop, Vladimir Vaynshteyn
Life of this patent
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Abstract
A method for controlling drilling fluid rate in a wellbore is disclosed. A drill string is disposed into the well and connected to a formation testing or sampling tool. Drilling fluid is circulated at a first rate through the drill string. Data related to the wellbore, a formation about the wellbore or the formation sampling tool is transmitted to a processor. Upon analysis of the data, the drilling fluid circulation rate is changed to a second rate that is different from the first rate.
Claims7
A method for controlling drilling fluid rate in a wellbore comprising:
- deploying a drill string into the well, the drill string connected to a formation testing or sampling tool;
- circulating drilling fluid at a first rate through the drill string;
- transmitting a measurement related to the formation testing or sampling tool to a surface processor wherein the measurement relates to a power level of a power supply powering the formation testing or sampling tool;
- and
- changing the circulation rate of the drilling fluid to a second rate based on the power level of the formation testing or sampling tool being below a predetermined level, wherein the first rate is at a rate sufficient to conduct mud pulse telemetry, the second rate is higher than the first rate and too high to conduct mud pulse telemetry.
A method for controlling drilling fluid rate in a wellbore comprising:
- deploying a drill string into the well, the drill string connected to a formation testing or sampling tool;
- circulating drilling fluid at a first rate through the drill string;
- transmitting a measurement related to the formation testing or sampling tool to a surface processor wherein the measurement relates to an operating temperature of the formation testing or sampling tool;
- and
- changing the circulation rate of the drilling fluid to a second rate based on the operating temperature exceeding a predetermined level or is at or near a maximum operating temperature, wherein the first rate is at a rate sufficient to conduct mud pulse telemetry, the second rate is higher than the first rate and too high to conduct mud pulse telemetry.
A method for controlling drilling fluid rate in a wellbore comprising:
- deploying a drill string into the well, the drill string connected to a formation testing or sampling tool;
- circulating drilling fluid at a first rate through the drill string;
- obtaining a measurement related to contamination of formation fluid with the formation testing or sampling tool wherein the measurement relates to the contamination level of extracted fluid;
- and
- changing the circulation rate of the drilling fluid to a second rate based on the contamination level of extracted fluid being below a predetermined level in order minimize contamination while still permitting the formation testing or sampling tool to have adequate power to obtain the measurement, wherein the first rate is at a rate sufficient to conduct mud pulse telemetry, the second rate is higher than the first rate and too high to conduct mud pulse telemetry.
Dependencies are inferred from the claim text.