- Industry: Oil & gas
- Number of terms: 8814
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A situation in which the well and the reservoir are continuously monitored. On the basis of this information, the well completion may be adjusted remotely to adapt to changes in downhole conditions. A permanent well monitoring system is composed of the following:<br><br>路 Inflow control valves that enable choking or shutting off different zones according performance such as drawdown, GOR or water cut <br>路 Downhole sensors that register pressure, fluid flow rate and temperature<br>路 Control lines for power transmission and transferring of monitored downhole data captured by downhole sensors. <br>路 A surface control unit to handle the monitored data and for remote operation of the downhole inflow control valves. <br><br>Wells with permanent monitoring systems are commonly called intelligent or smart wells. Permanent well monitoring is commonly used in multilateral wells, where hydraulically independent valves control the flow of each lateral and in deepwater wells, where well-intervention operations are often prohibitively expensive. <br><br>Permanent well monitoring helps improve reservoir management by quickly choking or shutting off zones, avoiding expensive well intervention. It also helps maximize production and optimize recovery.
Industry:Oil & gas
A situation in which the resistivity of the flushed zone is less than the resistivity of the undisturbed zone. Such a setting generally favors the use of electrode resistivity devices (laterologs, ring resistivity), which respond to resistivity, rather than induction and propagation resistivity devices, which respond to conductivity.
Industry:Oil & gas
A situation in which the resistivity of the flushed zone is greater than the resistivity of the undisturbed zone. Such a setting generally favors the use of induction devices, which respond to conductivity, rather than electrode resistivity devices (laterologs, ring resistivity), which respond to resistivity.
Industry:Oil & gas
A situation in which the formation shear-wave velocity varies azimuthally around the borehole, because unequal horizontal stresses in the formation have caused azimuthal variations in the stress concentrations around the borehole. These stress concentrations change the shear-wave speeds in the region surrounding the well from those in the far field, such that a characteristic response is observed in the dispersion of the dipole flexural mode.
Industry:Oil & gas
A single, impenetrable barrier to fluid flow in a reservoir that causes a change of a factor of two in the slope of buildup or drawdown curves. These are often observed in a normal test if the barrier is close (a few hundred feet or less) to the tested well. Most tests are not long enough to detect the presence of distant barriers. Two perpendicular barriers cause a change in the slope of a factor of four, and so forth, and models exist for a variety of geometries, typically for up to four barriers.
Industry:Oil & gas
A situation in which acoustic energy that propagates in one direction is confined in the other two directions as, for example, a mode confined to an interface between two different materials or within the borehole. The Stoneley wave, tube wave and flexural mode have important applications in formation evaluation, while most of the others, such as the Rayleigh wave and the various guided borehole modes (normal mode, leaky mode and hybrid mode), are considered interference that must be filtered out. In y slow formations, leaky modes can help determine formation compressional slowness.
Industry:Oil & gas
A single wellbore having tubulars and equipment that enable production from two segregated zones. In most cases, two tubing strings will be used to provide the necessary level of control and safety for the fluids from both zones. However, in some simple dual completions, the second or upper zone is produced up the tubing-casing annulus.
Industry:Oil & gas
A single wellbore having tubulars and equipment that enable production from two or more reservoir zones. In most cases, at least two tubing strings will be used to provide the necessary level of control and safety for production fluids. However, in some simple dual completions, the second or upper zone is produced up the tubing-casing annulus. The wellhead and surface flow-control facilities required for multiple completions can be complex and costly; hence, multiple completions are relatively uncommon.
Industry:Oil & gas
A single log created by splicing together two logs of the same type run at different times in the well; or by splicing two different types of log run at the same time. For example, it is common practice to splice all the basic logs run over different depth intervals in a well to obtain a single composite record.
Industry:Oil & gas
A single length of the pipe that is assembled to provide a conduit through which the oil or gas will be produced from a wellbore. Tubing joints are generally around 30 ft (9 m) long with a thread connection on each end. The specification of the tubing material, geometry of the tubing, and design of the connection thread are selected to suit the reservoir fluid and wellbore conditions.
Industry:Oil & gas
