Schlumberger Technology Corporation

Steven Villareal

Julian J Pop

Albert Hoefel

Kent David Harms

Ashers Partouche

Shahid Azizul Haq

A method for determining formation fluid sample quality includes analyzing sample capture data to identify distinguishing features indicative of whether a successful sample capture has occurred within a downhole tool. The method further includes prioritizing, based on the analysis, the sample capture data for transmission to a surface system.

Sample capture prioritization

Systems, methods, and devices for fault detection and tolerance in a downhole tool string are provided. If a fault is detected in an electrical path between tools of downhole tool string, one or more switches of a fault detection and tolerance circuit may be kept open to isolate the fault in an electrical path between tools of downhole tool string. If a fault is not detected, one or more switches of a fault detection and tolerance circuit may be closed to enable the transmission of signals on the electrical path. In some embodiments of fault detection and tolerance circuits, an additional one or more switches may be kept open to isolate the fault in electronics of the tool.

Fault detection and tolerance in downhole tool string assemblies

A downhole modular tool includes a first module, a second module, a third module, and one or more connectors for connecting the first, second, and third modules. Each module includes a drill collar, a drilling fluid passageway, a first fluid passageway, and a second fluid passageway. The one or more connectors connect any one of the first, second, and third modules, to another of the first, second, and third modules to transfer the drilling fluid, the first fluid, and the second fluid between the connected modules.

Modular connector

Detecting a failure mode of a fluid flow controller configured to control fluid flow between first and second chambers of a downhole positive displacement pump and a flow line, wherein the positive displacement pump comprises a piston moving in an axial reciprocating motion, and subsequently adjusting operation of the downhole positive displacement pump based on the detected failure mode such that the downhole positive displacement pump piston operates differently in different axial directions.

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Cheltenham, United Kingdom

Steven Villareal