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Rotary table (#20) rotates, along with its constituent parts, the kelly and kelly bushing, the drill string and the attached tools and bit. Shale shaker (#2) separates drill cuttings from the drilling fluid before it is pumped back down the wellbore. Stand (#16) is a section of 2 or 3 joints of drill pipe connected and stood upright in the ...
A balestron rig is a sailplan involving a boom that extends forwards of the mast and is pivoted on it. It is a balanced rig. [1] It involves a mainsail and a smaller jib on an unstayed mast. [2] Mainsail and jib are controlled by a single sheet. The rig was extensively used on model boats but has recently been used of full-sized vessels. [3]
Rotary assemblies [2] are commonly used where formations are predictable and the rig economics are an issue. In such an assembly the weight of the drill collars gives the BHA the tendency to sag or flex to the low side of the hole, collar stiffness length and stabiliser diameter and placement are engineered as a means of controlling the flex of the BHA.
A truss spar comprises three parts, a short-height, large-diameter cylindrical hull, atop a truss structure, atop tanks for heavy ballast. A cell spar consists of a cluster of small-diameter cylinders and relatively speaking, cheap to manufacture. Cylinders are either buoyancy only, or subdivided into buoyancy and ballast.
Active heave compensation (AHC) is a technique used on lifting equipment to reduce the influence of waves upon offshore operations. AHC differs from Passive Heave Compensation by having a control system that actively tries to compensate for any movement at a specific point, using power to gain accuracy.
The compensation would then be performed by the hoisting device (Drawworks), that would pay out or feed in wire according to estimated rig position in according to seabed. The technology of doing compensation prior to the actual change in weight ensures low fluctuations and better control for both the position and the weight on bit (WOB).
Rigging comprises the system of ropes, cables and chains, which support and control a sailing ship or sail boat's masts and sails. Standing rigging is the fixed rigging that supports masts including shrouds and stays. Running rigging is rigging which adjusts the position of the vessel's sails and spars including halyards, braces, sheets and ...
Surfcasting is a casting technique which separates the surfcaster from the ordinary shore, pier, or boat fisherman. Extremely long rods are frequently employed to extend the length of the cast, while specialized, two-handed casting techniques are used to cast the lure or bait the added distances required in many cases to reach feeding inshore fish.