- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
Pertaining to a rock that is incapable of transmitting fluids because of low permeability. Shale has a high porosity, but its pores are small and disconnected, so it is relatively impermeable. Impermeable rocks are desirable sealing rocks or cap rocks for reservoirs because hydrocarbons cannot pass through them readily.
Industry:Oil & gas
Pertaining to a sedimentary rock, such as sandstone or limestone, that contains only minimal amounts of clay minerals. Clean reservoir rocks typically have better porosity and permeability than dirty rocks whose pores are clogged with fine clay particles. Clean and dirty are qualitative, descriptive terms.
Industry:Oil & gas
Pertaining to a property of a substance that allows the substance to take up water from the surrounding atmosphere. Many materials used in drilling muds are hygroscopic, for example, high-purity grades of calcium chloride. Bentonite clay is also hygroscopic and absorbs water from the atmosphere. Care must be taken in packaging and handling such materials to avoid waste by premature hydration.
Industry:Oil & gas
Pertaining to a mud additive (usually lignosulfonate or lignite) that does not contain any chromium compounds.
Industry:Oil & gas
Pertaining to a material that can undergo stress, deform, and then recover and return to its original shape after the stress ceases. Once stress exceeds the yield stress or elastic limit of a material, permanent deformation occurs and the material will not return to its original shape once the stress is removed. In some materials, including rocks, elastic behavior depends on the temperature and the duration of the stress as well as its intensity.
Industry:Oil & gas
Pertaining to a material that associates with organic and oily surfaces and liquids and rejects aqueous systems. An example of organophilic behavior in drilling fluids is the organophilic coating applied to clays and lignites to make them dispersible in oil-base muds.
Industry:Oil & gas
Pertaining to a hydrocarbon source rock that has generated as much hydrocarbon as possible and is becoming thermally altered.
Industry:Oil & gas
Pertaining to a hydrocarbon source rock that has not fully entered optimal conditions for generation.
Industry:Oil & gas
