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Topic: Drill string

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	Drill string shock absorber - Patent 3963228
		In rotary drilling, it is typical to employ a multi-cone bit at the lower end of a drill collar string which is suspended from the lower end of a drill pipe extending upwardly to the surface.
		Drilling fluid or "mud" is pumped down the drill string and out of orifices in the bit and returns to the surface via the well annulus to cool the bit, clean the borehole bottom and to carry cuttings to the surface.
		A drilling fluid is pumped down the drill string and passes into the bottom of the borehole through orifices in the bit 11, and circulates back to the surface via the annulus between the drill string and the borehole wall.
	www.freepatentsonline.com /3963228.html (1820 words)

	Shear sub for drill string - Patent 4064953
		On lifting and rotating the drill string, the mandrel moves upwardly relative to the housing whereupon the lugs interlock with the splines to allow rotation of the drill bit as it is lifted off bottom.
		Drilling mud is circulated down the central passage through the drill collars, mandrel and couplings to the drill bit and the drill string rotated in the conventional manner.
		If a directional hole is to be drilled, the principal resistance to rotation of the drill string may be at a midpoint, for example near or at a whipstock, and the shear sub may then be most advantageously connected in the drill string at a midpoint.
	www.freepatentsonline.com /4064953.html (2103 words)

	Drill string member - Patent 7040422
		A drill string member as claimed in claim 1, wherein male and female tool joints are secured to the circular end portions at respective opposing ends of said member and plural said single tubular members are provided in a drill string, each interconnected by inter-engagement of said male and female tool joints.
		A drill string member as claimed in claim 1, wherein said drill string member is used as one of a drill pipe, an intermediate weight drill pipe, a heavyweight drill pipe, a drill collar, and a wash-over pipe.
		A drill string member as claimed in claim 1, wherein the diameter of a circle inscribed in the cross-section of the non-circular portion is not smaller than the inside diameter of the tool joints.
	www.freepatentsonline.com /7040422.html (2908 words)

	Method for optimizing the tripping velocity of a drill string - Patent 4566318
		The operation of pulling out or running in the drill string thus occurs in a plurality of pulls or runs wherein the pipe is accelerated from a stationery position to a pulling or running speed and then decelerated to another stationery position, generally in 60-90 foot intervals.
		A drilling fluid, commonly known as drilling mud, is continuously circulated down the drill string and up the annulus formed by the drill string and the borehole in order to maintain sufficient pressure in the borehole to impede the entrance of formation fluids into the borehole in order to prevent a well "blowout".
		Additionally, the velocity of the drill string in a plurality of corresponding intervals in the borehole is determined during the tripping operation.
	www.freepatentsonline.com /4566318.html (3453 words)

	Miller the Driller
		Tracking of the drill string is achieved by the use of a walk-over system or a downhole survey tool.
		Drill Bit: A tool which cuts the ground at the head of a Drill String, usually by mechanical means but may include Fluid Jet Cutting.
		A drilling fluid (i.e., bentonite slurry, water, or air pressure) is used to facilitate the drilling process by keeping the drill bit clean and aiding with spoil removal.
	www.millerthedriller.com /pages/glossary.html (2687 words)

	HardingDrillingmainpage
		The pilot drill string is not rotated except to orient the bend.
		The drill path is monitored by an electronic package housed in the pilot drill string near the cutting head.
		Generally, the reamer is attached to the drill string on the bank opposite the drilling rig and pulled back into the pilot hole.
	www.hardingdrilling.com /harding.php?id=2 (3880 words)

	U.S. Patent: 5186266 - Multi-walled drill string for exploration-sampling drilling systems - February 16, 1993
		The drill string according to claim 8 wherein said bit subassembly is provided with a bit head having a collar which slip-fits within the bottom end of said outer casing during a drilling operation whereby the outer casing shields the interior of the bit head from bore hole contamination.
		Drill strings composed of drill bit and drill stem sections coupled together, connected to a drill head assembly on the drill mast, are provided in sectional lengths of six to twelve feet.
		A preferred reverse-circulation drill string assembly is shown comprising a plurality of sections that are threaded to one another commencing with the drill head adapter 260, a plurality of intermediate pipe sections 264, and concluding with a drill bit section 266.
	www.everypatent.com /comp/pat5186266.html (6162 words)

	Exploration
		Drilling sites will be kept a distance to be determined by field study away from major water ways and away from the more sensitive coast in order to prevent possible significant platform spills from devastating the aquatic ecosystem.
		As the drill goes further into the ground, drill collars are added to the drill string in order to give the drill bit the right amount of pressure drilling into the formation.
		The drilling fluid will constantly be moving down the drill string and then up the sides of the hole, cooling and cleaning the bit and lifting the cuttings to the surface where they can be collected.
	web.mit.edu /12.000/www/m2007/teams/finalwebsite/drilling/drilling.html (4643 words)

	Utility Construction Methods Selection Guide
		The rotating and steerable hollow drill is launched from the surface or shallow excavation at an angle of 8-15° and is used to drill a pilot hole to the exit or endpoint of the bore with an advance rate of about 2 feet per minute.
		Water, a drilling fluid, or drilling mud is used for lubricating the drilling head and the hole.
		The pilot string is removed and the bore is enlarged by a rotating barrel reamer attached to and pulled back by the washover pipe, drilling mud being used to flush away the cuttings and to support the reamed hole.
	www.gastechnology.org /webroot/app/xn/xd.aspx?it=enweb&xd=ucguide\tech\installation_service\hdd\desc.xml (1505 words)

	Layne Christensen Company - Directional Drilling Services
		Drilling was conducted using a truck-mounted angle core drill with its mast centered over the borehole collar and aligned with the pre-set surface casing.
		The drilling plan called for the pilot hole to be within 2.5 inches (63.5mm) of planned hole trajectory at a point 53 feet (16.2m) from the surface.
		To confirm the location of the borehole relative to the inside of the tunnel, the drill string was pulled back and a sensor lowered to the bottom of the hole where its position was marked inside the tunnel.
	www.accu-dril.com /projects_hoover_dam.html (1215 words)

	Oil and Gas Well Drilling and Servicing eTool: Drilling Ahead
		The driller lowers the drill string and the kelly bushing is set in the rotary drive bushing and the rotary is engaged.
		The driller stops the drill string from rotating, and hoists the drill string with the drawworks until the kelly is out of the rotary table.
		Either the rotary table or kelly spinner is used to spin the drill string or kelly to unscrew it from the drill pipe joint.
	www.osha.gov /SLTC/etools/oilandgas/drilling/drilling_ahead.html (1518 words)

	FM 5-484 Chptr 5 Well-Drilling Methods
		Drilling fluid is pumped through the drill string and face of the drill bit and backup the annulus to the surface.
		Drilling fluid is circulated in rotary drilling to cool, clean, and lubricate the drill string, to flush cuttings from the hole, and to stabilize the borehole wall.
		Some disadvantages to air rotary drilling are that air cannot support the wall of a hole in an unstable formation, changes in the return air flow are not as readily apparent as in mud flow, and air is not as effective in cooling and lubricating the drill bit and string.
	www.globalsecurity.org /military/library/policy/army/fm/5-484/ch52.htm (12714 words)

	J. D. Hair & Associates, Inc.: HDD Process Description
		The components of a horizontal drilling rig used for pipeline construction are similar to those of an oil well drilling rig with the major exception being that a horizontal drilling rig is equipped with an inclined ramp as opposed to a vertical mast.
		Drill pipe and downhole tools are generally interchangeable and drilling fluid is used throughout the operation to transport drilled spoil, reduce friction, stabilize the hole, etc. Because of these similarities, the process is generally referred to as drilling as opposed to boring.
		For a prereaming pass, reamers attached to the drill string at the exit point are rotated and drawn to the drilling rig thus enlarging the pilot hole.
	www.jdhair.com /hdd.htm (1267 words)

	Exploration
		In this method, a wellbore is drilled with as little deviance as possible directly towards the reservoir; once it penetrates and goes through the reservoir, the well is stopped and the drill string removed.
		They’re made for rougher drilling conditions and less expensive; they aren’t ideal for small holes, but they are very sensitive to the porosity of the rock they are drilling through (drilling faster or slower depending on the pore pressure) giving the drilling crew a good idea of changes in pressure in the wellbore.
		Drilling fluid is forced down the drill string and is expelled out the jets, lubricating and cooling the drill bit while at the same time carrying the rock cuttings away from the bit, exposing fresh formation to be drilled.
	web.mit.edu /12.000/www/m2007/teams/finalwebsite/drilling/prod.html (2690 words)

	Untitled Document
		Additionally, due to the nature of riserless drilling and the remote operations of the program, the CDC report recommends that there be sufficient capacity for bulk mud storage and storage facilities for 1500 m of casing.
		Finally, the CDC report requested a combined drill string length of approximately 11,000 m and that the drill pipe have a minimum interior diameter of 4.125 inches to ensure passage of all sampling, coring, and wireline logging tools.
		To maintain the integrity of the drill string, which is subjected to a high degree of vessel motion inherent in the riserless drilling program, all drillpipe is to be handled at all times utilizing a dual elevator arrangement.
	www.joialliance.org /MREFC/briefing_book/drilling.html (1584 words)

	KGS--Petroleum: a primer for Kansas--Drilling the well (Site not responding. Last check: )
		Drilling fluid, better known as drilling mud, is circulated through the kelly and the drill string by means of pipes and flexible hose connecting the drilling fluid or mud pumps and a swivel device attached to the upper end of the kelly.
		Usually, the only interruptions to drilling operations will be to remove the drill string from the well bore for the replacement of the drill bit, a procedure known as tripping, and for the testing of formations for possible occurrences of oil or gas, known as drill-stem testing.
		The drill string is removed from the well bore to allow the insertion of logging tools, which are lowered all the way to the bottom of the hole by means of a special cable.
	www.kgs.ku.edu /Publications/Oil/primer12.html (3333 words)

	RIGZONE - Drill String Design Handbook
		While the drill string may seem to be a simple connection of metal pipes at first glance, it is in reality an intricate, potentially delicate piece of equipment of vital importance to the drilling industry.
		This text provides dozens of charts, drawings, and formulas to aid in the understanding and use of drill strings and their related technologies.
		From what parts make up the drill string to how to properly construct a working string, this informative manual explains it all in a simple, easy-to-understand (but not dumbed down) format.
	www.rigzone.com /affiliates/go.asp?aff_id=103&to=/store/product.asp?p_id=218&c_id=21 (180 words)

	Industry Terminology - oilfieldjobsok.com
		DRILL PIPE: Steel pipe, in approximately 30-foot (9-meter) lengths, screwed together to form a continuous pipe extending from the drilling rig to the drilling bit at the bottom of the hole.
		DRILL STRING: String of individual joints of pipe that extends from the bit to the kelly and carries the mud down to, and rotates, the bit.
		MOUSE HOLE: Hole drilled under the derrick floor and temporarily cased in which a single joint of pipe is placed awaiting connection to the drill string.
	www.oilfieldjobsok.com /custom/showpage.php?id=22 (2508 words)

	Oil and Gas Well Drilling and Servicing eTool: Glossary of Terms
		On a drilling rig, he or she may be responsible for the circulating machinery and the conditioning of the drilling or workover fluid.
		drill collar sub n: a sub made up between the drill string and the drill collars that is used to ensure that the drill pipe and the collar can be joined properly.
		drilling line n: a wire rope hoisting line, reeved on sheaves of the crown block and traveling block (in effect a block and tackle), the primary purpose of which is to hoist or lower drill pipe or casing from or into a well.
	www.osha.gov /SLTC/etools/oilandgas/glossary_of_terms/glossary_of_terms_d.html (2126 words)

	DIRECTIONAL DRILLING - MEASUREMENT WHILE DRILLING
		Given Sigra's knowledge of drill string connection behaviour (see ACARP report C4049) rod loading can be interpreted in terms of safe drilling practices that will not lead to drill rod breakage or getting stuck in hole.
		In addition to the drilling models described Sigra has a finite element model of a drill string that can be used to design stabilizers or collars.
		Information from the drill is transmitted up the drill string electronically to a computer located at the drill collar.
	www.sigra.com.au /ddrill.html (1303 words)

	Drill Pipe Testing Services
		It has been reported where a leak in a drill string created cement returns to the surface while cement was still being mixed, resulting in abandonment of the primary cement job, requiring numerous squeeze jobs to achieve an adequate cementation of the liner.
		During the drilling process, washouts due to leaks can cause problems with parting of the drill string, drilling inefficiencies due to higher pump pressures to achieve necessary downhole flow rates of drilling fluids and premature tripping of drill pipe to correct a leak.
		This is a direct application for external testing of the drill string or tubing connections since an external pressure differential is existent prior to and possibly even after perforating.
	www.gatorhawk.com /testing/drillpipets.html (967 words)

	Directional Drilling Guidelines
		The pilot drill string is not rotated except to orient the bend.
		The drill path is monitored by an electronic package housed in the pilot drill string near the cutting head.
		Generally, the reamer is attached to the drill string on the bank opposite the drilling rig and pulled back into the pilot hole.
	www.laneydrilling.com /drilling_overview.htm (646 words)

	DRILLING AND DRILL RIGS
		Today's rotary drill rig consists of multiple engines (gas, diesel) that supply power, hoisting equipment that raises and lowers the drill string (drill pipe), and rotating equipment that turns the drill string and the drill bit at the bottom of the hole.
		The rotating cones (Remember: the entire drill stem rotates in the hole and the drill bit is attached to the end of the drill stem) are the cutting heads.
		The fluid then flows out the center of the drill bit and is forced back up the outside of the drill pipe onto the surface of the ground where it is cleaned of debris and pumped back down the hole.
	www.leeric.lsu.edu /bgbb/5/rigs.html (1266 words)

	TH Hill Associates, Inc. (Site not responding. Last check: )
		If a drill string component is operating at very high stress levels in a hostile environment, no amount of inspection may suffice to eliminate the possibility of a failure.
		Drill stem failure mechanisms must be divided into two distinct groups because two different approaches are required to combat them.
		Since the drill string must often be operated at stresses above the threshold stress for Group 2 mechanisms, we cannot design the drill string to eliminate all possibility of failure.
	www.thhill.com /failure.php (1614 words)

	Drilling accessories - Bournedrill drill string (Site not responding. Last check: )
		The drill pipe is the pipe or rod to which the drill bit is connected.
		The drill pipe is made in differing sizes and lengths with various types of joints or couplings.
		The drill collar outside diameter is larger than that of the drill pipe but small enough to clear the wall of the hole.
	www.bournedrill.com.au /A-DSTRING.htm (207 words)

	Untitled Document
		The drill profile drawing establishes the Entrance and Exit angles and the radius of the method curvature, to achieve the depth and length of the drill.
		Once the drill bit exits the other end of the drill hole, (the Exit), the drill bit, steering tool, etc. are detached and a reamer, which is about 12 inches larger in diameter than the pipe to be installed, is attached to the drill string.
		During the reaming process, bentonite drilling mud is pumped, under high pressure, through the drill string to the reamer as the reamer is pulled back by the drill rig, drillpipe is attached continuously behind the reamer for the subsequent swabbing and pipe pulling operations.
	www.laneydrilling.com /html/directional.html (1539 words)

	ANDRILL\|science support
		As we write this week’s report the drill bit is at ~750mbsf, and we are progressing downwards at about 30m/day with the NQ drill string, our last drill string.
		Drilling with the HQ string was terminated at 700.04mbsf on Saturday 2nd of December, after it became locked in the hole at the end of a coring run.
		Subsequent flushing of the hole resulted in a return of drill fluid, indicating a seal around the HQ casing was occurring, and the decision was made to progress coring with the NQ string.
	www.andrill.org /report/8.html (870 words)

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