Oil and Gas Terms Beginning with “B” — Page 2

The Bingham plastic model is a two-parameter rheological model that describes the flow behavior of structured fluids — including most water-based drilling muds, cement slurries, and some oil-based muds — by stating that… Read more →

Biot theory is the mathematical framework developed by Maurice Biot in 1956 to describe how elastic (acoustic) waves propagate through porous, fluid-saturated rock. The key insight of Biot's work was that porous rock… Read more →

A birdbath in drilling and well completion engineering is an irregular, bowl-shaped enlargement of the wellbore created by mechanical erosion of the formation rock during drilling, localized at a specific depth interval… Read more →

A bit sub (also called a crossover sub , bit crossover , or lower bit sub ) is a short tubular connector, typically 0.3-1.0 m in length, installed immediately above the drill bit in the bottom-hole assembly (BHA) to… Read more →

Blaine fineness (also called Blaine specific surface area or Blaine air-permeability value ) is a measure of the total particle surface area per unit mass of Portland cement or other powder, expressed in square… Read more →

The blowout preventer stack (BOP stack) is the complete assembly of high-pressure wellbore control equipment installed on top of the wellhead before drilling into formations with kick potential — an engineered sequence… Read more →

A boiler in petroleum operations is a high-pressure vessel that transfers heat energy from combustion gases to feedwater to generate steam for injection into heavy oil and bitumen reservoirs in thermal enhanced recovery… Read more →

Bolt pins (also called stud bolts or simply studs in API wellhead and BOP documentation) are the threaded fasteners that join flanged components in high-pressure wellhead assemblies, BOP stack connections, Christmas… Read more →

The Boltzmann probability distribution (also called the Boltzmann distribution or, when applied to molecular velocities, the Maxwell-Boltzmann distribution ) is the fundamental statistical mechanics relationship… Read more →

The Bond number ( Bo ) is a dimensionless parameter in fluid mechanics and pore-scale physics that quantifies the relative importance of gravitational forces versus interfacial tension (capillary) forces acting on a… Read more →

Boolean simulation (also called object-based simulation or marked point process simulation ) is a stochastic geostatistical technique for building 3D reservoir models in which the spatial distribution of reservoir… Read more →

The Born approximation (also called the Born method or Born scattering in exploration geophysics) is a linearized wave scattering theory that describes how seismic energy interacts with small perturbations in subsurface… Read more →

The bottom-hole assembly (BHA) is the lowest section of the drill string, extending from the drill bit uphole to the transition point where heavyweight drill pipe (HWDP) or standard drill pipe begins, and is composed of… Read more →

The Bouguer anomaly is the residual gravitational acceleration at a measurement point after removing the contributions of: the reference theoretical gravity at that latitude (the normal gravity accounting for the… Read more →

The Bouguer correction is the specific computational step in a gravity data reduction workflow that removes the gravitational attraction of the rock mass between the measurement point and the chosen reference datum —… Read more →

The Bouma sequence is a vertical succession of sedimentary structures within a single turbidite bed that records the systematic decrease in depositional energy as a submarine density current decelerates and its… Read more →

The box end of a casing or tubing connection is the female-threaded end of the tubular that receives the male pin end of the adjacent joint, forming the sealed threaded coupling that transmits axial load, burst and… Read more →

Boyle's Law is the physical principle stating that at constant temperature, the pressure and volume of an ideal gas are inversely proportional — expressed mathematically as P × V = constant, or equivalently P1 × V1 = P2… Read more →

The Boyle's Law double-cell method is the laboratory core analysis procedure for measuring the helium pore volume of a rock sample by expanding a precisely known quantity of helium gas from a calibrated reference cell… Read more →

The Boyle's Law single-cell method is the core analysis procedure for measuring the helium grain volume of a rock sample — and thereby computing its porosity — using a single calibrated chamber that contains the rock… Read more →

The brake band is the flexible steel strap lined with friction material that wraps around the brake drum of a drilling rig drawworks to generate the stopping and holding force needed to control string descent during… Read more →

Breakout tong is the specific heavy-duty C-shaped pipe wrench applied to the tool joint of the upper drill string stand or tubing string during manual pipe breakout operations — the individual tool, as distinguished… Read more →

Bridle line in oilfield operations refers to a rigging component — a short length of wire rope, chain, or synthetic fiber rope configured in a V-shape or Y-shape with two or more attachment points at the load end and a… Read more →

Briggs Color Cube (also referred to as the Geological Color Reference or Drilling Fluid Color Standard) is a compact, standardized set of colored reference chips or cubes — transparent or translucent panels mounted in a… Read more →

British thermal unit (BTU or Btu) is the imperial unit of heat energy defined as the quantity of heat required to raise the temperature of one pound (0.4536 kg) of liquid water by one degree Fahrenheit (from 59°F to… Read more →

Brookfield viscometer in oilfield applications is a rotational rheometer that measures the apparent viscosity of a fluid by rotating a cylindrical or disc-shaped spindle immersed in the test sample at a precisely… Read more →

Brownian motion in oilfield science is the random, continuous, thermally driven motion of colloidal-size particles (those with at least one dimension between approximately 1 nanometre and 2 micrometres) suspended in a… Read more →

Bumper block in WCSB well production engineering is a rubber or polyurethane guide attached to the outside of the production tubing string at regular intervals — typically every 3-9 m in areas of high rod-string side… Read more →

Bushing puller in WCSB rotary drilling operations is a specialized lifting and extraction tool — typically a hydraulic ram assembly, a mechanical jack-screw device, or a purpose-built bail-and-lug extractor — used to… Read more →

Bushings in WCSB rotary table drilling refers to the set of interlocking steel inserts — the master bushing, the kelly bushing (or drive bushing in top-drive operations), and the pipe or casing bushings — that are… Read more →