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Simple diagram of a drilling rig and its basic operation. The kelly drive is #19. A kelly drive is a type of well drilling device on an oil or gas drilling rig that employs a section of pipe with a polygonal (three-, four-, six-, or eight-sided) or splined outer surface, which passes through the matching polygonal or splined kelly (mating) bushing and rotary table.
It is the most common method of reference for locations in the well, and therefore, in oil industry speech, "depth" also refers to the location itself. Strictly, depth is a vertical coordinate related to elevation, albeit in the opposite direction. However, "depth" in a well is not necessarily measured vertically or along a straight line.
Depiction of a directional well. Line (a) is an imaginary line representing the true vertical depth, while line (b) is the borehole itself, and its length is called the measured depth. A directional well is the oil industry term for an oil well with a borehole that deviates from a vertically straight line. This is normally done with the ...
True vertical depth [1] is the measurement of a straight line perpendicularly downwards from a horizontal plane. In the petroleum industry , true vertical depth, abbreviated as TVD, is the measurement from the surface to the bottom of the borehole (or anywhere along its length) in a straight perpendicular line represented by line (a) in the image.
In the oil industry, a deviation survey, [1] or simply a survey, is the measurement of a borehole's departure from the vertical, expressed in degrees (°).. When a well plan dictates the drilling of a straight borehole, surveys are periodically taken to ensure that it will hit its target and also to ensure that it does not trespass underneath different property lines.
Directional drilling (or slant drilling) is the practice of drilling non-vertical bores. It can be broken down into four main groups: oilfield directional drilling, utility installation directional drilling, directional boring (horizontal directional drilling - HDD), and surface in seam (SIS), which horizontally intersects a vertical bore ...
Source: Pioneer Natural Resources investor presentation. Hydraulic fracturing gets most of the credit and too much of the press for unlocking our massive shale oil and gas reserves. Few realize ...
This is the most common open hole completion used today. It is basically the same described on the vertical open hole completion but on a horizontal well it enlarges significantly the contact with the reservoir, increasing the production or injection rates of your well. Sand control on a horizontal well is completely different from a vertical well.