- Industry: Oil & gas
- Number of terms: 8814
- Number of blossaries: 0
- Company Profile:
A chemical agent added to a fluid system to retard or prevent an undesirable reaction that occurs within the fluid or with the materials present in the surrounding environment. A range of inhibitors is commonly used in the production and servicing of oil and gas wells, such as corrosion inhibitors used in acidizing treatments to prevent damage to wellbore components and inhibitors used during production to control the effect of hydrogen sulfide (H<sub>2</sub>S).
Industry:Oil & gas
A chemical additive used to protect wellbore components and treatment equipment from the corrosive action of an acid. The type and concentration of acid inhibitors are determined by the type of metal to be protected and the specific wellbore conditions, such as temperature and the length of exposure time anticipated during the treatment. To ensure efficient protection, the inhibitor should be consistently blended throughout the treatment fluid.
Industry:Oil & gas
A chemical additive used to prevent the formation of foam during the preparation of a treatment fluid or slurries at surface. Excess foam created during the mixing process may cause handling and pumping difficulties and may interfere with the performance or quality control of the mixed fluid. Antifoam agents may also be used to break foams returned from the wellbore, following a treatment, in preparation for disposal of the fluids.
Industry:Oil & gas
A chemical additive used to increase the thickening time of cement slurries or similar fluids that may have a limited pumping time. The increased pressure and temperature typically associated with deep wellbores requires the use of such performance-enhancing additives to enable efficient placement without premature setting.
Industry:Oil & gas
A chemical additive mixed with cement slurry to reduce the time required for the set cement to develop sufficient compressive strength to enable drilling operations to continue. Accelerators are generally used in near-surface applications in which the temperature is relatively low.
Industry:Oil & gas
A chemical additive or inert material used to decrease the density or increase the yield of a cement slurry. The slurry yield is typically expressed in cubic feet of slurry per sack of cement. Increasing the yield reduces the cost per volume of cement slurry, while reducing the slurry density reduces the hydrostatic pressure of the cement column, enabling weak zones to be successfully cemented and isolated.
Industry:Oil & gas
A chemical added to an acid to stabilize iron. The injected acid dissolves iron from rust, millscale, iron scales or iron-containing minerals in the formation. Iron can exist as ferric iron (Fe<sup>+3</sup>) or ferrous iron (Fe<sup>+2</sup>). If the iron is not controlled, it will precipitate insoluble products such as ferric hydroxide and, in sour environments, ferrous sulfide (FeS), which will damage the formation. <br><br>Reducing agents change or reduce Fe<sup>+3</sup> to Fe<sup>+2</sup> to avoid precipitation. Erythorbic acid is an effective reducing agent.
Industry:Oil & gas
A chemical additive used in stimulation treatments to prevent the migration or swelling of clay particles in reaction to water-base fluid. Without adequate protection, some water-base fluids can affect the electrical charge of naturally occurring clay platelets in the formation. Modifying the charge causes the platelets to swell or migrate in the flowing fluid and, once these are dispersed, it is likely that some clay plugging of the formation matrix will occur. Clay stabilizers act to retain the clay platelets in position by controlling the charge and electrolytic characteristics of the treatment fluid.
Industry:Oil & gas
A chemical additive used in acid treatments to protect iron and steel components in the wellbore and treating equipment from the corrosive treating fluid. Corrosion inhibitors generally are mixed with the treatment fluid and are formulated to be effective in protecting the metal components the fluid is likely to contact. This protection must remain effective under the anticipated pressure and temperature environment for the duration of the treatment.
Industry:Oil & gas
A chemical additive that reduces the cement slurry viscosity to improve fluid flow characteristics. Adequately dispersed cement slurries exhibit improved fluid-loss control, can displace drilling fluid more efficiently and be successfully mixed and pumped at higher densities.
Industry:Oil & gas
