Oil and Gas Terms Beginning with “B” — Page 10

What Is a Buffered Solution? A buffered solution is a liquid that resists sudden pH change when small amounts of acid or base are added. In oilfield labs, buffered solutions make pH calibration, hardness testing,… Read more →

Buggy vibro in land seismic acquisition is a compact, rubber-tired, self-propelled vibroseis source vehicle that carries a hydraulically actuated vibrator baseplate generating a controlled, swept-frequency seismic… Read more →

Buildup test in reservoir engineering is a pressure transient test conducted by shutting in a producing well after a stable period of flow and recording the bottomhole pressure recovery over time, with the resulting… Read more →

Bulk modulus in petroleum rock physics is the elastic modulus that relates hydrostatic stress to volumetric strain of a material — defined as K = -dP / (dV/V), where dP is the applied uniform pressure increment, dV is… Read more →

Bulk relaxation in nuclear magnetic resonance (NMR) logging is the T1 and T2 relaxation mechanism arising from molecular-level interactions within the pore fluid itself, independent of the pore wall surface, governing… Read more →

Bulk volume in petroleum petrophysics refers to the total volume of a rock sample or formation interval including both the solid mineral grains and all pore space, with units of m3 or fraction of the gross formation… Read more →

Bull plug in oilfield well construction is a solid, externally threaded coupling that screws into the box (female) end of a tubular string — drill pipe, production tubing, casing, or surface piping — to seal the open… Read more →

Bullet perforating in well completion is a perforation method in which small-caliber steel or tungsten projectiles (bullets) are propelled outward through the casing wall and cement sheath by a powder charge fired from… Read more →

Bullhead in well control is a kill method in which a dense kill fluid (kill weight mud or brine) is pumped down the production tubing or drill string and forced into the reservoir formation against the formation pore… Read more →

Bump the plug in oilfield cementing refers to the completion of the cement displacement stage of a primary cementing job at the moment the top wiper plug seats against and is arrested by the float collar (or float shoe)… Read more →

Bundle in WCSB oil sands and heavy oil surface gathering is an insulated pipeline assembly in which the production flow pipe, one or more electrical heat trace cables or a parallel steam trace line, and signal or… Read more →

Buoyancy in WCSB drilling and well engineering is the upward force exerted by the drilling or completion fluid on a steel tubular string (drill string, casing string, or production tubing) submerged in that fluid, equal… Read more →

Buoyancy method (also called the buoyancy factor method) in WCSB casing design and drill string analysis is the calculation procedure that determines the effective weight of a submerged tubular string by multiplying its… Read more →

Burn-over in WCSB well intervention and fishing is a milling operation in which a hollow shoe (the burn-over shoe, also called a washover shoe or cable burn shoe) run on the bottom of a drill string or workover string… Read more →

A burn over is a fishing operation in which a specialized milling tool called a burn shoe or burn mill is run over the outside diameter of a stuck downhole tool (the fish) to cut away its exterior, creating a profile… Read more →

Butt weld in WCSB pipeline construction and field piping is a fusion weld that joins two pipe sections end-to-end at beveled or machine-prepared pipe faces by filling the groove between the opposing pipe ends with… Read more →

Butterfly chart in formation evaluation and petrophysics is a graphical interpretation aid for correcting deep, medium, and shallow resistivity log measurements for the effect of mud filtrate invasion, producing the… Read more →

Button resistivity in WCSB logging while drilling (LWD) is a focused galvanic resistivity measurement made by small disc-shaped electrodes (buttons) mounted flush on the outer surface of the drill collar, each injecting… Read more →

Buttress thread (API designation BTC, buttress thread and coupling) in WCSB casing design is an API-standardized pipe thread form for oil country tubular goods (OCTG) defined in API Specification 5B, characterized by a… Read more →

By weight of blend (BWOB) dry blending in oilfield cementing refers to the physical manufacturing and delivery process by which API Class G or Class H neat cement is combined with one or more dry additives at a bulk… Read more →

By weight of cement (BWOC) in oilfield cementing slurry design is the concentration framework from which all quantitative slurry properties, yield, density, thickening time, compressive strength, and rheology, are… Read more →

By weight of water (BWOW) cement mix water design in oilfield cementing encompasses the characterization and control of the aqueous phase used to hydrate the cement slurry, encompassing mix water source quality,… Read more →

Bypass in WCSB downhole drilling tool design is the deliberate routing of drilling fluid flow through an alternative path that circumvents the primary tool mechanism, most commonly the bypass valve in a positive… Read more →

Bypass velocity in WCSB drilling hydraulics is the annular flow velocity of drilling fluid in the restricted annular gap between a downhole tool's outer diameter and the borehole wall or casing inner diameter, which is… Read more →

Bypassed mud in WCSB primary cementing is the drilling fluid that remains in isolated pockets or continuous channels within the cemented annulus after the cement slurry has been displaced and set, because the cement… Read more →