An additive that kills bacteria. Bactericides are commonly used in water muds containing natural starches and gums that are vulnerable to bacterial infection. Bactericide choices are limited by government approved types. Care must be taken to find those that are effective yet approved by governments and by company policy. Bactericides, also known as biocides, are used to control sulfate-reducing, slime-forming, and iron-oxidizing bacteria and bacteria that attacks polymers in fracture and secondary recovery fluids. In polymers, the degradation of the fluid is controlled, avoiding the formation of a large biomass, which could possibly clog the formation and reduce permeability.
A unit of volume measurement used for petroleum and its products (7.3 barrels = 1 ton: 6.29 barrels = 1 cubic meter).
The thickness of a layer or stratum of sedimentary rock measured perpendicular to its lateral extent, presuming deposition on a horizontal surface. Because sediment deposition can occur on inclined surfaces, apparent or measured bed thickness might differ from true bed thickness. The thickness of a given bed often varies along its extent.
One barrel of oil; 1 barrel = 35 Imperial gallons (approx.), or 159 liters (approx.); 7.5 barrels = 1 ton (approx.); 6.29 barrels = 1 cubic meter.
Billion cubic feet; 1 bcf = 0.83 million tons of oil equivalent.
Billion cubic meters (1 cubic meter = 35.31 cubic feet).
Big Hole Charge
A perforating charge designed to create perforations with a large-diameter entrance hole. These charges are used in sand control completions, in which efficient placement of the gravel pack treatment within the perforation tunnel is crucial. Altering the explosive charge design and materials creates a larger diameter entrance hole on the perforation while reducing the depth of penetration. However, gravel-pack treatments generally are applied in high-permeability formations where perforation tunnel length is less important. Wells that are to be hydraulically fractured also can benefit from larger perforations since the effective penetration is significantly increased by a high-conductivity fracture.
An acreage sub-division measuring approximately 10 x 20 kms, forming part of a quadrant. e.g. Block 9/13 is the 13th block in Quadrant 9.
Condensate and gas is produced simultaneously from the outset of production.
When well pressure is too great for the wellhead valves to contain it, oil and gas “blow wild” at the surface.
(BOPs) Are high pressure wellhead valves, designed to shut off the uncontrolled flow of hydrocarbons.
See blow-out preventers
The hole drilled by the drill bit.