A method for simulating a phenomenon involving phase change includes: calculating, by a processor, a degree of phase change in a porous medium per unit volume and unit time based on an area of a gas-liquid interface in the porous medium per unit volume and a phase change rate at the gas-liquid interface.

A method for simulating a phenomenon involving phase change includes: calculating, by a processor, a degree of phase change in a porous medium per unit volume and unit time based on an area of a gas-liquid interface in the porous medium per unit volume and a phase change rate at the gas-liquid interface.

A device may include a memory storing instructions and a processor configured to execute the instructions to determine an initial mass of a sample; distill the sample up to at least a thermal destruction temperature; record, at a set of time points during the distilling, vapor temperature values, liquid temperature values, and vapor pressure values associated with the sample; and determine a residual mass of the sample. The processor may be further configured to generate a pressure curve based on the vapor pressure values; calculate a summary integral surface for the generated pressure curve; and generate a distillation curve that relates the vapor temperature values and the liquid temperature values to mass percentage of the sample that has evaporated, based on the calculated summary integral surface, the initial mass of the sample, and the residual mass of the sample.

A method of determining an API gravity of a crude oil is provided. The method includes obtaining a reservoir sample containing the crude oil and heating the sample to a first temperature using an oxidative testing apparatus. The sample is then heated to a second temperature, which is greater than the first temperature, over a period using a fixed heating rate. The rate of carbon dioxide emission from the sample is detected during the period of heating to the second temperature. The peak rate of carbon dioxide emission from the sample is then determined and the peak carbon dioxide emission temperature associated with the peak rate of carbon dioxide emission is also determined. The API gravity of the crude oil in the reservoir sample is determined using an empirical correlation between API gravity and the peak carbon dioxide emission temperature associated with the fixed heating rate.

Embodiments herein relate to systems and methods for identifying a plurality of components of a petroleum sample. Embodiments further relate to determining respective atmospheric equivalent boiling points (AEBPs) for respective ones of the plurality of components. Embodiments further relate to determining a boiling curve for the petroleum sample based on the respective AEBPs. Embodiments further relate to outputting an indication of the boiling curve for the petroleum sample. Other embodiments may be described or claimed.

Embodiments herein relate to systems and methods for identifying a plurality of components of a petroleum sample. Embodiments further relate to determining respective atmospheric equivalent boiling points (AEBPs) for respective ones of the plurality of components. Embodiments further relate to determining a boiling curve for the petroleum sample based on the respective AEBPs. Embodiments further relate to outputting an indication of the boiling curve for the petroleum sample. Other embodiments may be described or claimed.

In an embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a differential scanning calorimeter (DSC) at a first initial pressure, the system volume being constant; maintaining the substance in a vapor phase; cooling the substance at a cooling rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a DSC at a first initial pressure, the system volume being constant; maintaining the substance in a liquid phase; heating the substance at a heating rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance in the presence of an adsorbent.

In an embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a differential scanning calorimeter (DSC) at a first initial pressure, the system volume being constant; maintaining the substance in a vapor phase; cooling the substance at a cooling rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a DSC at a first initial pressure, the system volume being constant; maintaining the substance in a liquid phase; heating the substance at a heating rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance in the presence of an adsorbent.

A system and method for distillation testing of a liquid sample at atmospheric pressure for the improved prediction of the heating necessary to reach the initial boiling point (IBP) and ensure the IBP is observed within certain time constraints, and regardless of sample composition. This monitors the sample by the camera during different heating phases of the test to obtain visual images of the sample and a computer analyzes image data observed to regulate the optimal distillation process.

In an embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a differential scanning calorimeter (DSC) at a first initial pressure, the system volume being constant; maintaining the substance in a vapor phase; cooling the substance at a cooling rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance, the method including introducing a substance into a sample cell of a calorimetric block of a DSC at a first initial pressure, the system volume being constant; maintaining the substance in a liquid phase; heating the substance at a heating rate; and generating a thermogram. In another embodiment is provided a method for measuring a vapor-liquid transition of a substance in the presence of an adsorbent.