Downhole formation tester apparatus and methods
First Claim
Patent Images
1. A system for pumping fluid at least partially through a downhole tool disposed in a wellbore, comprising:
- a displacement unit configured to pump the fluid;
a first flowline hydraulically connected to the displacement unit through a valve network for selectively communicating the fluid to or from the displacement unit;
a second flowline hydraulically connected to the displacement unit through the valve network for selectively communicating the fluid to or from the displacement unit;
a first chamber pressure gauge hydraulically coupled with a first chamber of the displacement unit;
a second chamber pressure gauge hydraulically coupled with a second chamber of the displacement unit;
a power supply providing a force configured to operate the displacement unit;
a force sensor configured to measure the force supplied to the displacement unit;
a sample probe hydraulically coupled to the first flowline;
an inflatable member hydraulically coupled to the first flowline;
a first flowline pressure gauge hydraulically coupled to the first flowline between the sample probe and the valve network; and
a fluid sample chamber hydraulically coupled to the second flowline.
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Abstract
A method according to one or more aspects of the present disclosure comprises disposing a tool in a wellbore, the tool comprising a displacement unit for pumping a fluid at least partially through the tool, a first flowline hydraulically connected to the displacement unit through a valve network, and a second flowline hydraulically connected to the displacement unit; pumping a fluid from the first flowline to the second flowline; monitoring a pressure at a chamber of the displacement unit; and monitoring flowing pressure in the first flowline across the valve network from the displacement unit.
24 Citations
15 Claims
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1. A system for pumping fluid at least partially through a downhole tool disposed in a wellbore, comprising:
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a displacement unit configured to pump the fluid; a first flowline hydraulically connected to the displacement unit through a valve network for selectively communicating the fluid to or from the displacement unit; a second flowline hydraulically connected to the displacement unit through the valve network for selectively communicating the fluid to or from the displacement unit; a first chamber pressure gauge hydraulically coupled with a first chamber of the displacement unit; a second chamber pressure gauge hydraulically coupled with a second chamber of the displacement unit; a power supply providing a force configured to operate the displacement unit; a force sensor configured to measure the force supplied to the displacement unit; a sample probe hydraulically coupled to the first flowline; an inflatable member hydraulically coupled to the first flowline; a first flowline pressure gauge hydraulically coupled to the first flowline between the sample probe and the valve network; and a fluid sample chamber hydraulically coupled to the second flowline. - View Dependent Claims (2, 3, 4)
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5. A method, comprising:
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disposing a tool in a wellbore, the tool comprising a displacement unit for pumping a fluid at least partially through the tool, a first flowline hydraulically connected to the displacement unit through a valve network, and a second flowline hydraulically connected to the displacement unit; pumping a fluid from the first flowline to the second flowline; monitoring a first pressure at a first chamber of the displacement unit; monitoring a second pressure at a second chamber of the displacement unit; performing a drill stem test utilizing the tool; and identifying pressure noise in response to measuring the first and second pressures. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method, comprising:
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disposing a formation testing tool in a wellbore, the tool comprising a displacement unit for pumping a fluid at least partially through the tool, a first flowline hydraulically connected to the displacement unit through a valve network, and a second flowline hydraulically connected to the displacement unit, wherein the valve network comprises at least a first active valve hydraulically connecting the first flowline to a first chamber of the displacement unit and a second active valve connecting the second flowline to a second chamber of the displacement unit; moving a piston of the displacement unit; monitoring flowing pressure in the first flowline; monitoring pressure in the first chamber or the second chamber; opening one of the first active valve and the second active valve in response to the pressure in the first chamber or the second chamber being about equal to or less than the monitored flowing pressure; and determining drag of the piston using a force sensor configured to measure force supplied to the displacement unit.
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13. A method, comprising:
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disposing a tool in a wellbore, the tool comprising a displacement unit for pumping a fluid at least partially through the tool, a first flowline hydraulically connected to the displacement unit through a valve network, and a second flowline hydraulically connected to the displacement unit; pumping a fluid from the first flowline to the second flowline; monitoring a first pressure at a first chamber of the displacement unit; monitoring a second pressure at a second chamber of the displacement unit; monitoring, a pressure in the first flowline across the valve network from the displacement unit; and monitoring a pressure in the second flowline across the valve network from the displacement unit and the first flowline; identifying the occurrence of no fluid flow from the displacement unit in response to one or more of monitoring the first pressure at the first chamber and monitoring the second pressure at the second chamber, and one or more of monitoring the pressure in the first flowline and monitoring the pressure in the second flowline; and determining the effective stroke of the piston in response to determining the occurrence of no fluid flow. - View Dependent Claims (14, 15)
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Specification