The oil-based muds (OBM) are commonly used in the drilling process of crude oil due to its resistance to high temperature and corrosion, good lubrication and least to formation damage. However, the samples taken from the underground after the well completion are often contaminated by the OBM which fail to represent the compositions and properties of the original reservoir fluids. It is, therefore, necessary to determine the contamination degree of the samples and to correct the …
Currently, four common PVT properties are provided:
The future development includes the following calculations of the PVT properties of oil, gas and formation water using the equations of state and the correlations.
Oil Formation volume factor, FVF（Bo）
Viscosity of live oil (saturated)
Viscosity of live oil (unsaturated)
Viscosity of dead oil
Live oil compressibility (saturated, P<Pb) …
CCE (Constant Composition Expansion / Constant Mass Expansion) Test
To optimize the exploration and production from oil and gas fields, the reservoir fluid samples are taken and sent to the laboratory for a series of tests to gain the knowledge of producing best quality products in a most economical way under the changes of pressure and temperature of the reservoir. For example, it is essential to understand at what conditions the initial one-phase fluid splits into two …
The gas hydrate is an “ice-like” crystal and formed by certain gas molecules trapped inside of "cages" of water molecules through hydrogen bonds. It is usually formed at high pressure and low temperature, but can also be formed at an ambience temperature.
Once it forms, the clathrate hydrates may quickly grow and block the pipelines and/or the production facilities, and result in the cease of production and even in the explosion. It is, therefore, a …
Lumping and De-lumping of Reservoir Fluids
The reservoir fluid usually consists of dozens, even hundreds of components. To perform the fluid property and phase equilibrium calculations for such a large group of mixture is quite time consuming and unpractical, especially to feed them as input to a reservoir simulator to perform simulations. It is, therefore, desirable to reduce that number into a few pseudo-components (usually less than 10) to accurately represent the original mixture. The …
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