Apparatus and methods for obtaining a data response of a fluid as a function of pressure of the fluid, and estimating a dew point pressure of the fluid by detecting an inflection pressure, a downward curve pressure, a characteristic change pressure, and an intersection pressure of the function representative of the data response. The estimated dew point pressure of the fluid based on at least one of the inflection pressure, the downward curve pressure, the characteristic change pressure, and the intersection pressure.

Methods and systems for the use of a thin-layer spectroelectrochemical cell to detect porphyrins in a wellbore environment are provided. In one embodiment, methods for the use of a thin-layer spectroelectrochemical cell to detect porphyrins in a wellbore environment comprises: positioning a spectroelectrochemical cell in a wellbore penetrating at least a portion of a subterranean formation comprising a downhole fluid; allowing at least a portion of the downhole fluid to flow into the spectroelectrochemical cell; and detecting at least one compound in at least a portion of the downhole fluid, wherein the at least one compound is selected from the group consisting of: a porphyrin, a metalloporphyrin, a porphyrin derivative, a porphyrin-like macrocycle, and any combination thereof.

A downhole tool includes a membrane to separate water from a formation fluid and a meter that operates as a densitometer and a Coriolis effect flowmeter.

A formation testing tool which performs the dual function of fracturing and in-situ proppant placement. The testing tool houses proppant slurry having proppant and fracture fluid therein, and a probe which seals against the wellbore wall. During operation, the probe seals against the wellbore wall whereby fluid communication may take place. Using a pump aboard the testing tool, the fracture fluid is forced through the probe and into the formation to produce the fractures. The testing tool, which has a pressurized compartment, then injects the proppant into the fractures.

A no purge sampler for collecting fluid samples includes a flexible tube having a sealed first end and a second end, the tube defining an interior cavity, a check valve disposed at the second end of the tube, and at least one aperture above the check valve. To collect fluid samples, the no purge sampler is lowered into the fluid to be sampled. The at least one aperture streamlines the tube as it is lowered into the fluid reducing drag-down and mixing. Once the sampler reaches the desired depth, the sampler is pulled upwards allowing fluid to enter the interior cavity. The sampler is then pulled out of the fluid without losing any of the fluid in the interior cavity of the tube or contaminating the sample with any extraneous fluid.

A diffusion sampler includes an elongated tubular structure, a first coupling device, at least a first membrane and a reservoir mechanism. The structure has an outer wall that defines an interior space therein. The outer wall defines a plurality of openings. A membrane is disposed around the outer wall at least in the area of the upper portion of the structure and is configured to allow at least one first selected type of molecule to pass therethrough. A reservoir mechanism is coupled to a bottom portion of the structure and is configured to define a reservoir in the lower portion of the structure that prevents a selected liquid from flowing out of the lower portion of the structure.

Disclosed are an apparatus for sampling water in a borehole and a method thereof. The apparatus includes a water sampling cylinder to sample the water in the borehole; a first camera to monitor the water sampling cylinder and a sample discharging part provided in the borehole; a first motor to insert the water sampling cylinder into the sample discharging part; a vacuum vessel to receive a sample input from the water sampling cylinder; a waterproof member having a hole serving as a passage through which the water sampling cylinder moves back and forth; and a supporting member that urges the waterproof member closely to the sample discharging part to prevent foreign substances from being introduced into the borehole. The first motor includes a plurality of protrusions meshed with a plurality of grooves provided in the water sampling cylinder.

The present disclosure relates to a method of fracturing and sampling an isolated interval within a wellbore. The method includes deploying a plurality of packers to isolate the interval and initiating a fracture at the isolated interval. The method further includes directing a motive fluid into a proppant injection chamber to direct a proppant stored within the proppant injection chamber into the isolated interval. Sampling also may be performed at the isolated interval.

The disclosure provides a formation fluid pumping method and pump, and a wellbore system that in one example includes wellbore surface equipment connected to a downhole tool including a formation fluid container having a fluid input port and a fluid output port, and a moveable piston inside the formation fluid container having two fluid chambers positioned to alternately pump a quantity of formation fluid in the formation fluid container from the fluid input port to the fluid output port. The wellbore system further includes a mechanical piston actuator having a rotary portion attached to the formation fluid container and a linear portion attached to the moveable piston, and a brushless direct current motor coupled to the rotary portion of the mechanical piston actuator and controlled to alternately rotate the rotary portion of the mechanical piston actuator in opposite directions to pump the quantity of formation fluid.

Apparatus and methods for obtaining a data response of a fluid as a function of pressure of the fluid, and estimating a dew point pressure of the fluid by detecting an inflection pressure, a downward curve pressure, a characteristic change pressure, and an intersection pressure of the function representative of the data response. The estimated dew point pressure of the fluid based on at least one of the inflection pressure, the downward curve pressure, the characteristic change pressure, and the intersection pressure.