Method for determining drilling fluid properties downhole during wellbore drilling
AssigneeSchlumberger Technology Corporation
InventorIain Cooper
Life of this patent
Estimating the term…
Abstract
Determining the downhole rheological properties of a wellbore fluid. The method includes moving the wellbore fluid through a wellbore tool assembly into a wellbore at a first flow rate. A pressure is measured at a first position proximate a bottom of the wellbore. A pressure is measured at a second position in the wellbore axially separated from the first position. The wellbore fluid is then moved through the wellbore tool assembly at a second flow rate. Measuring pressure at the first and second positions is repeated, and at least one rheological property is determined from the pressure measurements.
Claims22
A method for determining rheological properties of a wellbore fluid, comprising:
- estimating a static pressure at a first position proximate a bottom of the wellbore, and
- a static pressure at a second position axially separated from the first position;
- moving the wellbore fluid through a wellbore tool assembly into a wellbore at a first flow rate;
- measuring a pressure at the first and the second positions;
- moving the wellbore fluid through the wellbore tool assembly at a second flow rate;
- repeating measuring a pressure at the first and second positions;
- and
- determining at least one rheological property from the pressure measurements.
A method for determining rheological properties of a wellbore fluid, comprising:
- measuring a static fluid pressure at a first position proximate the bottom of the wellbore and a static fluid pressure at a second position proximate the bottom of the wellbore and axially spaced apart from the first position, the measuring;
- recording the static pressure measurements in a tool assembly disposed in the wellbore
- moving the wellbore fluid through a wellbore tool assembly into a wellbore at a first flow rate;
- measuring fluid pressure at the first position and at the second position at the first flow rate;
- moving the wellbore fluid through the wellbore tool assembly at a second flow rate;
- repeating measuring pressure at the first and second positions at the second flow rate;
- transmitting the recorded pressure measurements and the pressure measurements made at the first and second flow rates to the earth's surface;
- and
- determining at the earth's surface at least one rheological property from the pressure measurements.
Dependencies are inferred from the claim text.