DOWNHOLE FORMATION TESTER

• US 20110114310A1
• Filed: 11/16/2009
• Published: 05/19/2011
• Est. Priority Date: 11/16/2009
• Status: Active Grant

• Current Assignee: Schlumberger Technology Corporation (SLB)
• Original Assignee: Schlumberger Technology Corporation (SLB)
• Inventors: Ross, Simon, Campanac, Pierre
• Granted Patent: US 8,448,703 B2
• Time in Patent Office: Days
• US Class Current: 166/250.17
• CPC Class Codes: E21B 49/10 using side-wall fluid samplers or testers

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.

Claims

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; and

a second chamber pressure gauge hydraulically coupled with a second chamber of the displacement unit.

2. The system of claim 1 further comprising a first flowline pressure gauge hydraulically coupled to the first flowline across the valve network from the displacement unit.

3. The system of claim 1 further comprising:

a first flowline pressure gauge hydraulically coupled to the first flowline across the valve network from the displacement unit; and

a second flowline pressure gauge hydraulically coupled to the second flowline across the valve network from the displacement unit and the first flowline pressure gauge.

4. The system of claim 1 further comprising:

a sample probe or sample packer hydraulically coupled to the first flowline; and

a fluid sample chamber hydraulically coupled to the second flowline.

5. The system of claim 1 further comprising:

a sample probe or sample packer hydraulically coupled to the first flowline;

a fluid sample chamber hydraulically coupled to the second flowline; and

a first flowline pressure gauge hydraulically coupled to the first flowline between the sample probe and the valve network.

6. The system of claim 1 further comprising:

a sample probe hydraulically coupled to the first flowline;

a fluid sample chamber hydraulically coupled to the second flowline;

a first flowline pressure gauge hydraulically coupled to the first flowline between the sample probe and the valve network; and

a second flowline pressure gauge hydraulically coupled to the second flowline between the fluid sample chamber and the valve network.

7. The system of claim 1 further comprising:

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.

8. A method, comprising:

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; and

monitoring a second pressure at a second chamber of the displacement unit.

9. The method of claim 8 further comprising monitoring flowing pressure in the first flowline across the valve network from the displacement unit.

10. The method of claim 8 wherein pumping fluid comprises pumping fluid into a container, and wherein the method further comprises ceasing pumping fluid into the container in response to the pressure monitored at the chamber of the displacement unit being about a rated pressure of the container.

11. The method of claim 8 further comprising:

performing a drill stem test utilizing the tool; and

identifying pressure noise in response to measuring the first and second pressures.

12. The method of claim 8 further comprising:

inflating a packer element by pumping fluid into the packer element to achieve an inflate pressure; and

checking achievement of the inflate pressure relative at least one of the measured first and second pressures.

13. The method of claim 8 further comprising:

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.

14. The method of claim 13 further comprising identifying the occurrence of no fluid flow from the displacement unit in response to at least one of monitoring the pressure of the first chamber and monitoring the pressure of the second chamber, and at least one of monitoring the pressure of the first flowline and monitoring the pressure of the second flowline.

15. The method of claim 13 further comprising:

identifying the occurrence of no fluid flow from the displacement unit in response to at least one of monitoring the pressure of the first chamber and monitoring the pressure of the second chamber, and at least one of monitoring the pressure of the first flowline and monitoring the pressure of the second flowline; and

determining the effective stroke of the piston in response to determining the occurrence of no fluid flow.

16. A method, comprising:

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 the flowing pressure in the first flowline;

monitoring the pressure in the low pressure chamber of the first chamber and the second chamber; and

opening one of the first active valve and the second active valve in response to the pressure in the low pressure chamber being about equal to or less than the monitored flowing pressure.

17. The method of claim 16 further comprising determining drag of the piston using a force sensor configured to measure force supplied to the displacement unit.