Apparatus and method for obtaining downhole samples
AssigneeSchlumberger Technology Corporation
InventorColin Longfield
Life of this patent
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Abstract
A downhole drilling tool positionable in a wellbore penetrating a subterranean formation is provided. The tool includes a formation evaluation tool having fixed and retrievable portions. The fixed portion is operatively connected to a drill collar of the downhole tool. The fixed portion is for establishing fluid communication with a subterranean formation. The retrievable portion is fluidly connected to the fixed portion and retrievable therefrom to a surface location. The retrievable portion is for receiving a formation fluid from the subterranean formation.
Claims21
A downhole drilling tool positionable in a wellbore penetrating a subterranean formation, comprising:
- a formation evaluation tool comprising:
- a fixed portion operatively connected to a drill collar of the downhole tool, the fixed portion for establishing fluid communication with a subterranean formation;
- and
- a retrievable portion fluidly connected to the fixed portion and retrievable therefrom to a surface location, the retrievable portion for receiving a formation fluid from the subterranean formation, wherein the retrievable portion comprises a plurality of sample chambers for collecting a plurality of samples of the formation fluid.
A method of performing formation evaluation via a downhole drilling tool positionable in a wellbore penetrating a subterranean formation, the method comprising:
- establishing fluid communication between a fixed portion of the downhole drilling tool and a first portion of the formation;
- drawing a first sample of formation fluid from the formation and into the fixed portion;
- passing the first sample of formation fluid from the fixed portion to a first one of a plurality of sample chambers in a retrievable portion of the downhole drilling tool;
- disestablishing fluid communication between the fixed portion of the downhole drilling tool and the first portion of the formation and establishing fluid communication between the fixed portion of the downhole drilling tool and a second portion of the formation;
- drawing a second sample of formation fluid from the formation and into the fixed portion;
- passing the second sample of formation fluid from the fixed portion to a second one of the plurality of sample chambers in the retrievable portion of the downhole drilling tool;
- and
- retrieving the retrievable portion of the downhole drilling tool to a surface location, thereby simultaneously retrieving to the surface location the first and second samples of formation fluid in the first and second ones of the plurality of sample chambers.
Dependencies are inferred from the claim text.