A standard sample for measuring rock porosity by helium method is disclosed, which includes a cylinder body open above and a cover body matching the cylinder body. The center of the cover body is provided with a vent hole. The cylinder body is filled and tamped with filled sand body so that theoretical porosity in the cylinder body is 5%-10%. The filled sand body includes mixed sand body and quartz cotton. The mixed sand body includes coarse-grained high-purity quartz sand, medium-grained high-purity quartz sand and fine-grained silicon micropowder. By mixing, filling and tamping high-purity quartz sand with different particle sizes, silicon micropowder and quartz cotton, the porosity and permeability of the standard sample are reduced, so that the standard sample is closer to the physical properties of the actual shale geological samples to verify the method or calibrate the instrument for measuring rock porosity with helium method.

Methods and systems for determining fracture and matrix permeability of a subsurface formation. The system includes two upstream reservoirs and two downstream reservoirs, and a sample cell connecting to the reservoirs with valves. The sample cell has a confining pressure (CF) from a fluid. A horizontal plug sample with sleeve is placed in a measurement cell with the confining fluid (CF). A pressure gauge is connected to the small upstream reservoir, and a pressure gauge is connected to the small downstream reservoir. The results provide two sets of effective-stress-dependent permeability values (including fracture permeability and matrix permeability, respectively) for characterizing the reservoir properties.

Methods and systems for increasing normalized production rate of an oil and gas reservoir by optimizing a pressure drawdown of a subsurface formation are disclosed. The methods include determining permeability of the subsurface formation as a function of effective stresses, determining a stress sensitivity factor for the core sample, upscaling the sensitive stress factor, determining the optimum pressure drawdown for the subsurface formation, and controlling the pressure drawdown in a field operation such that it does not exceed the optimum pressure drawdown for the subsurface formation.

An apparatus includes (i) a test chamber having an inlet and an outlet; (ii) an introduction system configured to introduce a test pollutant into the test chamber such that the test pollutant is entrained in air flowing from the inlet to the outlet; (iii) a support configured to retain the test article, wherein the support defines a passageway downstream of a location of the test article such that air flowing from the inlet to the outlet passes through the filter medium prior to entering the passageway; (iv) an air flow apparatus configured to draw air from within the test chamber through the passageway and the outlet; and (v) a respiratory conditions simulation system configured to simulate an aspect of respiration, an external environment simulation system configured to simulate an aspect of an external environment, or both the respiratory conditions simulation system and the external environment simulation system.

The present technology generally relates to a porous medium parameter measurement device. The porous medium parameter measurement device comprises: a liquid permeable portion comprising a fluid permeable component and a polymer swellable solution; and comprises a gas permeable portion comprising a gas permeable component. The liquid permeable portion is in operative communication with the gas permeable portion through the gas permeable component; and the gas permeable component acts to purge gases from the liquid permeable component and the polymer swellable solution.

Methods, apparatus, and systems for testing a hydrogen permeability of a non-metallic pipe are provided. In one aspect, an apparatus for testing a hydrogen permeability of a non-metallic pipe includes: pipe sealing pieces, a test cylinder, a high pressure gas source, a gas exhaust tube, a vacuum pump, and a pressure sensor. A plurality of circumferential reinforcement pieces are disposed on a circumferential inner wall surface of a cylindrical body of the test cylinder to be in contact with an outer surface of a to-be-tested pipe placed in the test cylinder and perform circumferential reinforcement on the to-be-tested pipe.

Systems and methods for operating an engine that includes an exhaust system with a differential pressure sensor are described. In one example, output of the differential pressure sensor is compared to output of a barometric pressure sensor to determine whether or not the barometric pressure sensor is degraded. The output of the differential pressure sensor may be monitored while the engine is rotated without being fueled.

A water penetration testing chamber comprises male extrusions and female extrusions wherein the male extrusions have exterior surfaces that slide into the space defined by the female extrusions' interior surfaces and the female extrusions each have an interior surface against which the male extrusions' exterior surfaces can slide creating a plurality of male/female telescoping extrusion assemblies; and corners to which male/female telescoping extrusion assemblies attach; wherein adjustment of male/female telescoping extrusion assemblies allows altering the length and width of the water penetration testing chamber to fit the exact size of a rough opening of a window or door assembly.

The invention relates to an in vitro method for determining the adsorbing capacity of an adsorbent having limited solubility, such as a bile acid sequestrant, under conditions simulating the mammalian gastrointestinal tract. The method is particularly useful for studying the release profiles of controlled release formulations comprising adsorbents having limited solubility.

The systems and method described in this specification relate to at least partially restoring carbonate core samples. The systems and methods include extracting a carbonate core sample from a subterranean formation. The extracted carbonate core sample is inserted into a core flooding test machine. A first brine permeability of the extracted carbonate core sample is measured. A fluid is pumped through the extracted carbonate core sample to flood the carbonate core sample. The fluid includes at least one of a high-molecular weight polymer solution and a gel particle solution. The systems and methods include at least partially restoring the porosity and the brine permeability of the flooded carbonate core sample by pumping an oxidizing solution through the carbonate core sample and heating the carbonate core sample to a temperature of at least 60° C. after pumping the oxidizing solution through the carbonate core sample.