Non-flashing downhole fluid sampler and method

Details Non-flashing downhole fluid sampler and method Non-flashing downhole fluid sampler and method

1997-09-23

2000-05-23

Noland, Thomas P.

Measuring and testing

Sampler, sample handling, etc.

Capture device

7386301, 7386451, 7386462, 7386463, 166264, G01N 120, E21B 4908

Patent

active

060653558

ABSTRACT:
A non-flashing fluid sampler for use in obtaining a well fluid sample. The sampler comprises a body defining a first chamber, a second chamber, a third chamber and a sampling port therein. The sampling port is in communication with the first chamber and with an outside zone outside the body. The second and third chambers are initially isolated from one another by a control valve. Upon activating the control valve, fluid may flow from the second chamber to the third chamber through a flow restriction. An extendable floating piston is disposed between the first and second chambers, and the floating piston defines a variable volume therein. An initial amount of well fluid flows into the variable volume, thus trapping dirty fluid, and subsequently, a well fluid sample is flowed into the first chamber. An isolation valve is provided for allowing hydrostatic pressure into the sampler after the fluid sample has been taken. Check valves prevent outward fluid flow from the sampler and thereby trap the hydrostatic pressure therein. Methods of use of the sampling apparatus are also disclosed.

REFERENCES:
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patent: 4409825 (1983-10-01), Martin et al.
patent: 4463599 (1984-08-01), Welker
patent: 4787447 (1988-11-01), Christensen
patent: 4903765 (1990-02-01), Zunkel
patent: 5058674 (1991-10-01), Schultz et al.
patent: 5240072 (1993-08-01), Schultz et al.
patent: 5687791 (1997-11-01), Beck et al.

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