A method includes positioning a downhole acquisition tool in a wellbore in a geological formation. The method includes operating a pump module to gather information for a fluid outside of the downhole acquisition tool that enters the downhole acquisition tool from a first flowline, a second flowline, or both while the downhole acquisition tool is within the wellbore. Operating the pump module includes controlling a valve assembly to a first valve configuration that enables the fluid to flow into the downhole tool via the first flowline fluidly coupled to a first pump module. Operating the pump module includes controlling a valve assembly to a second valve configuration that enables the fluid to flow into the downhole tool via the second flowline fluidly coupled to a second pump module, and selectively using a turnaround module or a crossover portion disposed between the first flowline and the second flowline to permit discharging the fluid from one flowline to the other flowline by actuating a valve associated with the turnaround module when the first pump module or the second pump module is not in use.

A tool assembly and method are for performing formation stress testing in an openhole section of a borehole, wherein the openhole section of the borehole is to be provided with, or already have been provided with, a perforation tunnel generated by a series of electrically induced focused acoustic shock waves. The tool assembly has at least two borehole isolation means arranged with an axial distance therebetween for forming an isolated section at the openhole section of the borehole; a pump device for altering a pressure within the isolated section; a pressure sensor for measuring a pressure within the isolated section; a control unit for controlling a testing sequence; an acoustic shock wave device for generating the series of acoustic shock waves to excavate the perforation tunnel; and an acoustic shock wave sub for actuating the acoustic shock wave device.

Methods and systems are provided for conducting formation analysis. Data from borehole logging tools is used to conduct a petrophysical analysis of the formation in order to determine (quantify) total porosity and formation matrix permittivity for an interval of the formation. Noninvaded zone water saturation and flushed zone water saturation for the interval of the formation is determined using a saturation model of the interval. The noninvaded zone water saturation is compared to the flushed zone water saturation, and the results of the comparison are used to determine that the interval of the formation contains movable hydrocarbon, immobile hydrocarbon or movable formation water.

Systems, devices, and techniques for determining downhole fluid contamination are disclosed. In one or more embodiments, phase-related properties are measured for a reservoir fluid having a determined composition. An equation-of-state (EOS) isselected and/or tuned based, at least in part, on the measured phase-related properties and the tuned EOS is applied to estimate fluid property values for a reference fluid over specified ranges of at least two thermodynamic properties. Contaminant reference data are generated that correlate the estimated fluid property values for the reference fluid with respective contaminant levels. Within a wellbore, a fluid sample is analyzed to determining a fluid property values. A contaminant level is identified that corresponds within the contaminant reference data to the determined fluid property value of the fluid sample.

Provided herein are new methods of analyzing release-resistant water in materials, such as geologic materials. The methods of the invention typically comprise removal of extraneous water, e.g., by drying, preparing the material for the release of release-resistant water (e.g., by crushing the material, but typically not so greatly as to cause the release of fluid from hermetically sealed components, such as fluid inclusions), and then analyzing the amount of release-resistant water in the sample, either directly in-situ or by the additional step of extracting the release-resistant water and measuring the extraction. The invention also provides new devices and/or systems useful in the performance of such methods.

A method of predicting behavior or a degradable device of a borehole tool when deployed downhole including introducing a test mass of material identical to the material of the degradable device to the same general location and at a time near to when the degradable device is deployed, removing the test mass from downhole, determining characteristics related to degradation of the test mass, and predicting degradation behavior of the degradable device based on the determined characteristics.

A method and microfluidic device to perform reservoir simulations using pressure-volume-temperature (“PVT”) analysis of wellbore fluids.

Disclosed herein are methods and system for formation fluid sampling. In at least some embodiments, the method includes pumping formation fluid from a public flow line of a downhole tool via a private flow line into a detachable sample chamber. The method also includes isolating the private flow line from the public flow line. The method also includes collecting measurements of the formation fluid in the private flow line. The method also includes associating the measurements with the detachable sample chamber.

Examples described herein provide a downhole sampling method that includes receiving fluid data from a fluid downhole in a wellbore operation. The method further includes defining a subset of the fluid data and a remaining subset of the fluid data. The method further includes iteratively generating, by a processing device, a plurality of curves fit to the subset of the fluid data. The method further includes performing, by the processing device, a validation on the plurality of curves as applied to the remaining subset of the fluid data to determine one or more best fit curves from the plurality of curves.

A siphon pump chimney can be used in a mini-drillstem test to increase formation fluid flow rates. A formation tester can be coupled to a siphon pump chimney via a wet connect assembly to transfer formation fluid from a fluid-bearing formation. The siphon pump chimney can receive the formation fluid through the wet connect and disperse the formation fluid into a drill pipe that is flowing drilling fluid. The siphon pump chimney can include check valves to prevent the drilling fluid from entering the siphon pump chimney. The siphon pump chimney can be configured to have a variable height that can reduce pressure within the siphon pump chimney to a pressure value that can be close to or less than the formation pressure, which can allow a pump to operate at high flow rates or be bypassed in a free flow configuration.