- Settore: Oil & gas
- Number of terms: 8814
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The assembly on a coiled tubing reel that guides the tubing string onto the drum. Accurate spooling is necessary to avoid damaging the tubing and to ensure that the entire string can be run and retrieved without jamming. The levelwind functions automatically, although it incorporates a manual override to facilitate minor corrections.
Industry:Oil & gas
The arrangement of lines and valves used to direct and control fluid on a pumping unit. The manifold on the pump suction is generally known as the inlet or low-pressure manifold. The corresponding manifold located on the pump discharge is commonly known as the high-pressure or discharge manifold. In most cases, reference to the pump manifold relates to the high-pressure manifold.
Industry:Oil & gas
The area surrounding the wellbore that has been harmed by the drilling process, generally as a result of mud or cement-filtrate invasion. Near-wellbore damage can significantly affect productivity and is typically easier to prevent than it is to cure. Although almost always present, a lightly damaged zone around the wellbore can be bypassed by perforation tunnels to create connecting conduits from the wellbore to the undamaged reservoir formation. More severe cases of damage may require a matrix-acidizing treatment to restore the natural permeability, or a hydraulic fracturing treatment to create a new high-conductivity flow path to the reservoir.
Industry:Oil & gas
The approximated flow time used for a well-test analysis when the flow rate varies before or during the test period. It is calculated as t = cumulative well production since the last extended shut-in period divided by the flow rate just before a well is shut in for a buildup test.
Industry:Oil & gas
The application of tools, equipment and techniques for the removal of junk, debris or fish from a wellbore. The key elements of a fishing operation include an understanding of the dimensions and nature of the fish to be removed, the wellbore conditions, the tools and techniques employed and the process by which the recovered fish will be handled at surface.
Industry:Oil & gas
The application of nuclear magnetic resonance (NMR) logging to the determination of hydrocarbon type (gas, light oil, medium oil, heavy oil), using only NMR data. Three techniques are most commonly used: differential spectrum, shifted spectrum and enhanced diffusion.
Industry:Oil & gas
The apparent increase in thickness of a casing or tubing string compared to the assumed value. Metal gain is determined by electromagnetic thickness, acoustic resonance or mechanical methods. The apparent increase is usually due a change of hardware, such as a casing coupling, a heavier joint, a pup joint, a mandrel or a valve. The term is used in contrast to metal loss caused by corrosion.
Industry:Oil & gas
The angle at which a wellbore diverges from vertical. Wells can deviate from vertical because of the dips in the beds being drilled through. Wells can also be deliberately deviated by the use of a whipstock or other steering mechanism. Wells are often deviated or turned to a horizontal direction to increase exposure to producing zones, intersect a larger number of fractures, or to follow a complex structure.
Industry:Oil & gas
The analysis of transient rate and pressure data taken while a well is flowing at variable rates. The analysis uses either deconvolution or convolution to correct for the flow-rate variations and can make drawdown data interpretable. It has also been applied to correct for afterflow during the buildup.
Industry:Oil & gas
