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Geosteering is the optimal placement of a wellbore based on the results of realtime downhole geological and geophysical logging measurements rather than three-dimensional targets in space. The objective is usually to keep a directional wellbore within a hydrocarbon pay zone defined in terms of its resistivity, density or even biostratigraphy.
Cement bond log. A cement bond log documents the evaluation of the integrity of cement work performed on an oil well. [1] In the process of drilling and completing a well, cement is injected through the wellbore and rises up the annulus between the steel casing and the formation. [2]
Formation fluid refers to the naturally occurring liquids and gases contained in geologic formations. [1] Fluids introduced during the drilling process are called drilling fluids. [2] Fluids in an oil or gas reservoir are called reservoir fluids. [1] The fluids flowing from the wellhead of an oil or gas well are called production fluids .
Mud cake (also mudcake) is the layer of particulates from drill mud coating (caking) the inside of a borehole after the suspension medium has seeped through a porous geological formation. [1] Similar to filter cake . Mud cake provides a physical barrier to prevent further penetration and loss of drilling fluid, as well a later loss of produced ...
The Schlumberger Oilfield Glossary defines oil field as: "An accumulation, pool or group of pools of oil in the subsurface. An oil field consists of a reservoir in a shape that will trap hydrocarbons and that is covered by an impermeable or sealing rock. Typically, industry professionals use the term with an implied assumption of economic size."
Choke manifold. In oil and gas production a choke manifold is used to lower the pressure from the well head. It consist of a set of high pressure valves and at least two chokes. These chokes can be fixed or adjustable or a mix of both. The redundancy is needed so that if one choke has to be taken out of service, the flow can be directed through ...
Estimated pore pressure. Estimated pore pressure, as used in the oil industry and mud logging, is an approximation of the amount of force that is being exerted into the borehole by fluids or gases within the formation that has been penetrated. [1] In the oil industry, estimated pore pressure is measured in pounds per square inch (psi), but is ...
Casing hanger. In petroleum production, the casing hanger is that portion of a wellhead assembly which provides support for the casing string when it is lowered into the wellbore. It serves to ensure that the casing is properly located. When the casing string has been run into the wellbore it is hung off, or suspended, by a casing hanger, which ...
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