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U.S. Department of Labor Occupational Safety sometimes termed the annular space. HomeGeneral SafetySite PreparationDrillingWell CompletionServicingPlug and Abandon the Well Blowout Preventer A large valve, usually installed above the ram preventers, that s a seal in the annular space between the pipe and well bore or, if no pipe is present, on the well bore itself. Brake The braking device on the drawworks to stop a load being lifted. Bulk Mud Components in Storage Hopper type tanks for storage of drilling fluid components. Casing Head A heavy, flanged steel fitting connected to the first string of casing. It provides a housing for slips and packing assemblies, allows suspension of intermediate and production strings of casing, and supplies the means for the annulus to be sealed off. Also called a spool. Cathead A spool-shaped attachment on a winch around which rope for hoisting and pulling is wound. Catline Boom and Hoist Line A structural framework erected near the top of the derrick for lifting material. Catwalk The ramp at the side of the drilling rig where pipe is laid to be lifted to the derrick floor by the catline or by an air hoist. Cellar A pit in the ground to provide additional height between the rig floor and the well head to accommodate the installation of blowout preventers, ratholes, mouseholes, and so forth. It also collects drainage water and other fluids for disposal. Choke Manifold The arrangement of piping and special valves, called chokes, through which drilling mud is circulated when the blowout preventers are closed to control the pressures encountered during a kick. Conductor Pipe The largest diameter casing and the topmost length of casing. It is relatively short and encases the topmost string of casing. An assembly of sheaves or pulleys mounted on beams at the top of the derrick. The drilling line is run over the sheaves down to the hoisting drum. Degasser The equipment used to remove unwanted gas from a liquid, especially from drilling fluid. Desander A centrifugal device for removing sand from drilling fluid to prevent abrasion of the pumps. It may be operated mechanically or by a fast-moving stream of fluid inside a special cone-shaped vessel, in which case it is sometimes called a hydrocyclone. Desilter A centrifugal device, similar to a desander, used to remove very fine particles, or silt, from drilling fluid. This keeps the amount of solids in the fluid to the lowest possible level. Crown Block and Water Table Doghouse A small enclosure on the rig floor used as an office for the driller or as a storehouse for small objects. Also, any small building used as an office or for storage. Drawworks The hoisting mechanism on a drilling rig. It is essentially a large winch that spools off or takes in the drilling line and thus raises or lowers the drill stem and bit. Drill Bit The cutting or boring element used in drilling oil and gas wells. Most bits used in rotary drilling are roller-cone bits. The bit consists of the cutting elements and the circulating element. The circulating element permits the passage of drilling fluid and uses the hydraulic force of the fluid stream to improve drilling rates. Drill Collar A heavy, thick-walled tube, usually steel, used between the drill pipe and the bit in the drill stem. It is used to put weight on the bit so that the bit can drill. Drill Pipe The heavy seamless tubing used to rotate the bit and circulate the drilling fluid. Joints of pipe 30 feet long are coupled together with tool joints. Drillers Console The control panel, located on the plat, where the driller controls drilling operations. Drilling Line A wire rope hoisting line, reeved on sheaves of the crown block and traveling block in effect a block and tackle. Its primary purpose is to hoist or lower drill pipe or casing from or into a well. Also, a wire rope used to support the drilling tools. Electric Control House On diesel electric rigs, powerful diesel engines drive large electric generators. The generators produce electricity that flows through cables to electric switches and control equipment enclosed in a control cabinet or panel. Electricity is fed to electric motors via the panel. Electric Cable Tray Supports the heavy electrical cables that feed the power from the control panel to the rig motors. Elevators A set of clamps that grips a stand, or column, of casing, tubing, drill pipe, or sucker rods, so the stand can be raised or lowered into the hole. Engine Generator Sets A diesel, Liquefied Petroleum Gas LPG, natural gas, or gasoline engine, along with a mechanical transmission and generator for producing power for the drilling rig. Newer rigs use electric generators to power electric motors on the other parts of the rig. Fuel Tanks Fuel storage tanks for the power generating system. Hoisting Line A wire rope used in hoisting operations. Must con to the API standards for its intended uses. Hook A large, hook-shaped device from which the elevator bails or the swivel is suspended. It is designed to carry maximum loads ranging from 100 to 650 tons and turns on bearings in its supporting housing. Kelly The heavy square or hexagonal steel member suspended from the swivel through the rotary table. It is connected to the topmost joint of drill pipe to turn the drill stem as the rotary table turns. Kelly Bushing A device fitted to the rotary table through which the kelly passes. It is the means by which the torque of the rotary table is transmitted to the kelly and to the drill stem. Also called the drive bushing. Kelly Spinner A device for spinning the drill pipe. Replaces the spinning chain. Mast A portable derrick capable of being erected as a unit, as distinguished from a standard derrick, which cannot be raised to a working position as a unit. Monkeyboard The derrickmans working plat. Double board, tribble board, fourable board; a monkey board located at a height in the derrick or mast equal to two, three, or four lengths of pipe respectively. Mousehole Shallow bores under the rig floor, usually lined with pipe, in which joints of drill pipe are temporarily suspended for later connection to the drill string. Mud-Gas Separator A device that removes gas from the mud coming out of a well when a kick is being circulated out. Mud Pits A series of open tanks, usually made of steel plates, through which the drilling mud is cycled to allow sand and sediments to settle out. Additives are mixed with the mud in the pit, and the fluid is temporarily stored there before being pumped back into the well. Mud pit compartments are also called shaker pits, settling pits, and suction pits, depending on their main purpose. Mud Pump A large reciprocating pump used to circulate the mud drilling fluid on a drilling rig. Mud Return Line A trough or pipe, placed between the surface connections at the well bore and the shale shaker. Drilling mud flows through it upon its return to the surface from the hole. Pipe Racks A horizontal support for tubular goods. Pipe Ramp An angled ramp for dragging drill pipe up to the drilling plat or bringing pipe down off the drill plat. A blowout preventer that uses rams to seal off pressure on a hole that is with or without pipe. It is also called a ram preventer. Ram-type preventers have interchangeable ram blocks to accommodate different O.D. drill pipe, casing, or tubing. Rathole A hole in the rig floor 30 to 35 feet deep, lined with casing that projects above the floor. The kelly is placed in the rathole when hoisting operations are in progress. Reserve Pits A mud pit in which a supply of drilling fluid has been stored. Also, a waste pit, usually an excavated, earthen- walled pit. It may be lined with plastic to prevent soil contamination. Rotary Hose The hose on a rotary drilling rig that conducts the drilling fluid from the mud pump and standpipe to the swivel and kelly; also called the mud hose or the kelly hose. Ram Blowout Preventer Rotary Table The principal component of a rotary, or rotary machine, used to turn the drill stem and support the drilling assembly. It has a beveled gear arrangement to create the rotational motion and an opening into which bushings are fitted to drive and support the drilling assembly. Note the pipe spinner in red on the side of the swivel. Shale Shaker A series of trays with sieves or screens that vibrate to remove cuttings from circulating fluid in rotary drilling operations. The size of the openings in the sieve is selected to match the size of the solids in the drilling fluid and the anticipated size of cuttings. Also called a shaker. Slips Wedge-shaped pieces of metal with teeth or other gripping elements that are used to prevent pipe from slipping down into the hole or to hold pipe in place. Rotary slips fit around the drill pipe and wedge against the master bushing to support the pipe. Power slips are pneumatically or hydraulically actuated devices that allow the crew to dispense with the manual handling of slips when making a connection. Packers and other down hole equipment are secured in position by slips that engage the pipe by action directed at the surface. Spinning Chain A relatively short length of chain attached to the tong pull chain on the manual tongs used to make up drill pipe. The spinning chain is attached to the pull chain so that a crew member can wrap the spinning chain several times around the tool joint box of a joint of drill pipe suspended in the rotary table. After crew members stab the pin of another tool joint into the box end, one of them then grasps the end of the spinning chain and with a rapid upward motion of the wrist “throws the spinning chain“that is, causes it to unwrap from the box and coil upward onto the body of the joint stabbed into the box. The driller then actuates the makeup cathead to pull the chain off of the pipe body, which causes the pipe to spin and thus the pin threads to spin into the box. Stairways Stairs leading from one level to another. Protected with handrails. Standpipe A vertical pipe rising along the side of the derrick or mast. It joins the discharge line leading from the mud pump to the rotary hose and through which mud is pumped going into the hole. Substructure The foundation on which the derrick or mast and usually the drawworks sit; contains space for storage and well control equipment. Surface Casing Usually the first casing to be run in a well. This is done after spudding-in so a blowout preventer can be installed before drilling is started. Swivel A rotary tool that is hung from the rotary hook and traveling block to suspend and permit free rotation of the drill stem. It also provides a connection for the rotary hose and a passageway for the flow of drilling fluid into the drill stem. Tongs The large wrenches used for turning when making up or breaking out drill pipe, casing, tubing, or other pipe; variously called casing tongs, rotary tongs, and so forth according to the specific use. Power tongs are pneumatically or hydraulically operated tools that spin the pipe up and, in some instances, apply the final makeup torque. Top Drive The top drive rotates the drill string end bit without the use of a kelly and rotary table. The top drive is operated from a control console on the rig floor. Traveling Block An arrangement of pulleys or sheaves through which drilling cable is reeved, which moves up or down in the derrick or mast. Walkways An area cleared for moving through by personnel and protected with a handrail. Water Tank Is used to store water that is used for mud mixing, cementing, and rig cleaning. Weight Indicator A device for measuring the weight of the drill string. Monthly calibration to calculated drill string weight is required by API. eTools Page | eTool Home | Site Preparation | Drilling | Well Completion | Servicing | Plug Houston, TX 77042; 713 781-0758. air hoist n a hoist operated by compressed air; a pneumatic hoist. Air hoists are often mounted on the rig floor and may be used to lift joints of pipe and other heavy objects. ANSI American National Standards Institute n a non-profit organization 501c3 that administers and coordinates voluntary standardization and conity assessment system. General Inquiries Telephone 212 642-4900; Headquarters 1819 L Street, NW, Washington, DC 20036, Telephone 202 293-8020; Fax 202 HomeGeneral SafetySite PreparationDrillingWell CompletionServicingPlug and Abandon the Well 293-9287; New York Office 25 West 43rd Street, New York, NY 10036 Telephone 212 642-4900; Fax 212 398-0023 API American Petroleum Institute n a trade association and standards organization that represents the interests of the oil and gas industry. It offers publications regarding standards, recommended practices, and other industry related ination. Address 1220 L Street NW; Washington, DC 20005; 202 682-8000 IADC International Association of Drilling Contractors n a trade association that represents the interests of members of the drilling segment of the oil and gas industry. It offers publications regarding recommended industry practices and training materials. Address 15810 Park Ten Place., 242; Houston, TX 77084; 281 578-7171. annular blowout preventer n a well control device, usually installed above the ram preventers, that s a seal in the annular space between the pipe and well bore or, if no pipe is present, over the well bore itself. annular pressure n pressure in an annular space. annulus n the space around a pipe in a well bore, sometimes termed the annular space. API-monagram adj; the logo of the American Petroleum Institute API that is placed on certain pieces of oilfield equipment by the equipment manufacturer. API licenses the use of the monogram on equipment that meets the APIs minimum standards. It offers publications regarding standards, recommended practices, and other industry related ination. Address 1220 L Street NW; Washington, DC 20005; 202 682-8000 artificial lift n any used to raise oil to the surface after a well ceases to flow. TOP eTool Home | Site Preparation | Drilling | Well Completion | Servicing | Plug a mineral frequently used to increase the weight or density of drilling mud. Its relative density is 4.2 meaning that it is 4.2 times denser than water. See barium sulfate, mud. barium sulfate n a chemical compound of barium, sulfur, and oxygen BaSO4, which may a tenacious scale that is very difficult to remove. Also called barite. barrel bbl n 1. a measure of volume for petroleum products in the United States. One barrel is the equivalent of 42 U.S. gallons or 0.15899 cubic meters 9,702 cubic inches. basket