# US 8,770,286 B2 · Downhole fluid filter

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- Number: US 8,770,286 B2
- Document ID: US8770286B2
- Status: Granted
- Kind: B2
- Application number: 13/855,294
- Filed: 2013-04-02
- Published: 2013-08-29
- Granted: 2014-07-08
- Earliest claimed: 2009-02-02
- Assignees: Schlumberger Technology Corporation
- Applicants: Schlumberger Technology Corporation
- Inventors: Stephane Briquet; Kevin Zanca; Wade Evans, II
- Web page: https://patentgrep.com/patent/US8770286B2

## CPC

- E21B 49/081: {with down-hole means for trapping a fluid sample (E21B49/10 takes precedence)}
- E21B 49/10: using side-wall fluid samplers or testers
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

An apparatus for testing a subterranean formation penetrated by a wellbore, comprising a tool having a sample flow line an inlet disposed with the tool and configured to establish fluid communication between the formation and the sample flow line to draw a fluid sample into the sample flow line, and an active filter positioned in the sample flow line and providing a filter flow route and a bypass flow route in the sample flow line.

## Claims

### Claim 1

A system for a formation testing tool, comprising:
a module with a fluid sampling inlet configured to draw a fluid sample from at least one of a wellbore and a subterranean formation into a sample flow line, wherein the module is configured with a body forming a filter flow route and a bypass flow route in the sample flow when connected to the tool;
a filter connected within the filter flow route, the filter within the body;
a bypass valve in fluid connection with the filter flow route and the bypass flow route, wherein the bypass valve is configured to operate between a filter position routing the fluid sample through the filter flow route and a bypass position routing the fluid sample through the bypass flow route;
a purge valve in fluid connection with the filter flow route, the purge valve configured to operate between the filter flow route and exterior of the body and a closed position blocking the fluid communication; and
a device movably disposed with the filter, the device being configured to expel the fluid sample from the filter when moved toward the purge valve in the open position.

### Claim 2 (depends on 1)

The system according to claim 1 further comprising:
a biasing member urging the device toward the purge valve.

### Claim 3 (depends on 2)

The module of claim 2, wherein the device is urged away from the purge valve when the fluid sample is flowing through the filter flow route.

### Claim 4 (depends on 1)

The module of claim 1, wherein the body forms an open window and the filter is positioned in the window when connected within the filter flow route.

### Claim 5 (depends on 1)

The module of claim 1, further comprising:
ports in the body, wherein the ports are in operational connection with the sample flow line for connecting to a fluid characteristic sensor.

### Claim 6 (depends on 1)

The module of claim 1, wherein the formation tester tool is configured for conveyance within the wellbore by at least one of a wireline and a drillstring.