US2216895A - Rotary underreamer - Google Patents

Rotary underreamer Download PDF

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Publication number
US2216895A
US2216895A US266313A US26631339A US2216895A US 2216895 A US2216895 A US 2216895A US 266313 A US266313 A US 266313A US 26631339 A US26631339 A US 26631339A US 2216895 A US2216895 A US 2216895A
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blades
pin
position
underreamer
openings
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Expired - Lifetime
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US266313A
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John C Stokes
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Reed Roller Bit Co
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Reed Roller Bit Co
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Priority to US266313A priority Critical patent/US2216895A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00Drill bits
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/322Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools cutter shifted by fluid pressure

Description

Oct. 8, 1 0- J. c. STOKES ROTARY UNDERREAMER Filed April 6, 1959 on p Patented on a, 1940" PATENT OFFICE noraar UNDERREAMEB John 0. Stokes, Houston, Tex., minor to Deed Roller Bit Company, Houston, Tex, a corporation of Texas Application April 6, 1939, Serial No. 266,313

2 Claims.

This invention relates to a rotary underreamer and has 'for its general object the provision of a means for supporting and. actuating the cutting parts thereof.

Rotary underreamers have been designed in the past in which the cutting parts or blades have i been expanded in various ways, both mechanical and by fluid pressure, so that the underreamer could ream out a well hole below the lower end of a casing therein to a diameter larger than the casing itself. However, difficulty has in the past been encountered in that it has been impossible in many cases for the operator at the surface of the earth to tell whether an underreamer which has been lowered into a well has its blades in expanded position so that drilling may proceed or whether the blades are folded or moved inwardly to an inactive position or to a position of smaller diameter. 'I'heresult of this has been that in many cases an underreamer would fail to operate properly and might actually be ruined by an attempt to drill therewith when the cutting parts were not properly expanded.

It is, therefore, an object of this invention to provide a rotary underreamer of such a nature that an operator at the surface of the earth will be able to determine with a high degree of certainty at any particular time whether the cutting parts thereof have been expanded to active or cutting position.

Another object of this invention is to provide a rotary underreamer the blades of which will be expanded and locked in expanded position by fluid pressure but which will not be retracted when the fluid pressure ceases.

Another object of this invention is to provide a rotary underreamer of such a nature that fluid under pressure in substantial quantities may be pumped through a drill stem to which it is attached only when the cutting parts are in expanded position.

Other objects and advantages of this invention will become apparent from the following description taken in connection with the accompanying drawing, wherein is set forth byway of example only one embodiment of this invention.

In the drawing:

Fig. 1 is a view partly in vertical cross section and partly in side elevation, illustrating a rotary underreamer constructed in accordance with this invention, with the cutting blades thereof in retracted or inactive position.

Fig. 2 is a similar view showing the cutting parts in expanded or active position Fig. 3 is a horizontal cross section taken along the line 3-3 of Fig. 2.

Fig. 4 is a bottom plan view of the device shown in Fig. 3.

The underreamer constructed in accordance with this invention is adapted to be secured to the lower end of a drill stem I of any conventional constructionby means of threads 2. The body 3 on which the threads 2 are formed is provided with a lower part 4 of enlarged external and internal diameter, and is externally threaded at its lower end as indicated at 5 for the reception of the reamer head 6. Thereamer head 6 within its upper end is provided with an opening having an upwardly facing shoulder 1 against which is seated a corresponding shoulder on a liner 8. Resting on the upper end of this liner and secured in place by contact with the lower end of the body 3 is a disc-like element 9 having fluid passages Ill therethrough at points spaced about its outer periphery and having a similar opening ll therethrough for the reception of a plunger stem or guide I2. The disc 9 is also slightly countersunk on its upper side as shown at l3 for the purpose of receiving and positioning the lower end of the compression coil spring I! which surrounds the stem 12. The upper end of this spring It bears against a washer l5 which in turn is held inplace on the stem l2 by means of nuts [6 threaded onto the upper end thereof. on its lower end, this stem I2 is adapted to receive the piston-like elements l1 and I8, the element l8 being provided with a channel for the reception of a U-shaped packing ring I9. This packing ring l9 fits snugly within a cylindrical lower part of the reamer head 6.

The element I8 is illustrated as being threaded to the lower end of the stem l2 at 2| and prevented from becoming unscrewed from the stem by means of a cotter key 22 or the like. This element is also provided with a pair of downwardly extending spaced arms 23 which are substantially parallel and are adapted to receive the blades 24 and 25 between them. Each of these blades 24 and 25 has an opening 26 therethrough and a pin 21 is extended through these openings in the blades and the arms 23 and threaded into one of them so as to secure the blades 2| and 25 to the element I8. The openings 26 in the blades are in each instance of elongated form, the length of the respective openings being equal to the maximum distance traveled by the piston comprising the elements l1 and [8. Each of these openings also has an oiiset portion 28 so as to permit the blades to move laterally with respect 5 to the pin 21 when the pin is so. located that it may enter these portions II of the openings 20.

Each of the blades is provided with a lower cutting portion 29 and with an upper or shank portion 3.. The openings 28 are formed in these shank portions and each shank portion is provided also with laterally extending ears 3| and 32 adapted to engage the upwardly facing shoulder 33 within the reamer head I, when the blades are in their lower or expanded position as illustrated in Fig. 2. The blades are held in snug engagement with each other and prevented from vibration or lost motion between the arms 23 by means of springs 34 located in countersinks in the respective blades and bearing against the inner surfaces of the respective arms 13.

In operation, the device is lowered into a well hole through a casing therein with the parts in the position shown in Fig. l. The plunger consisting of the elements l1 and It will be retained in its upper position as shown by means of the spring l4 and the blades 24 and 25 will be prevented from expanding both by the slight frictional engagement caused by the springs 34 and by the fact that they cannot expand so long as the tool is within the casing. When the tool has been lowered to a point below the casing and it is desired to begin drilling or reaming, the slush pumps will be started and slush forced into the drill stem I under pressure. This pressure will act upon the upper portion of the piston and tend to force the same downwardly. So long as the piston remains in the position shown in Fig. 1, however, very little slush can flow downwardly through the drill stem because of the fact that the element l1 substantially shuts oil! or greatly reduces the area available for slush flow from the drill stem. 11, therefore, the blades or any other part of the device shall have become stuck, or if due to some obstruction the blades cannot open or expand, the pin 21, together with the piston will be prevented from moving downwardly and the pump which is adapted to pump slush through the drill stem will either stall or operate only at a very slow speed. This will notify the operator or driller that the blades have not expanded and are not in position for drilling. If and when the blades do expand, they will move to the position shown in Fig, 2 in which position the elongated portions of the openings 26 will be in alignment and will permit the downward movement of the pin 21 and the piston, whereupon the element I! will substantially clear the enlarged portion 35 within the reamer head 6 so that slush may pass from the drill stem downwardly into this portion 35 and thence into and through the slush passageways 38 leading downwardly therefrom. When this occurs, the slush pump will operate freely and the, driller will know that the blades have expanded and that the device is in position for drilling. He may then proceed with the drilling in the usual manner.

When the drilling is completed the slush pump is stopped or pressure in the drill stem is otherwise relieved so as to permit the spring l4 to move the piston upwardly. Inasmuch as the elongated portions of the openings 26 in the blades are of the same extent as the possible movement of the pin 21, the piston and this pin may move upwardly to an upper limit of movement without, however, disturbing the expanded position of the blades 24 and 25. The pin 2'! under these circumstances will simply move upwardly to the upper ends of these openings and the blades will remain in expanded position. However, when the device is pulled upwardly these blades will come in contact with the lower end of the casing and will be moved thereby downwardly and inwardly. This will cause the shanks of these blades to move to the position shown in Fig. 1 wherein the pin 21 lies in the lateral extension 28 of each of these openings. The device may then be withdrawn from the well in the usual manner.

It will be seen from the foregoing that a means has been provided whereby all of the objects and advantages sought by this invention may be accomplished.

Having described my invention, I claim:

1. In a rotary underreamer, a reamer head, cutter blades carried by said head for expansion and retraction with respect thereto, each of said blades having an elongated opening therethrough, and fluid pressure actuated means for exerting an expanding force on said cutter blades, said means including a yoke adapted to straddle the slotted portions of said cutter blades, and a pin carried by said yoke and passing through said slots for movement therein, said slots and pin being so positioned relative to each other that when said blades are in expanded position said pin and said fluid pressure means may move within the maximum limits without movement of said blades.

2. In a rotary underreamer, a. reamer head, cutter blades carried by said head for expansion and retraction with respect thereto, each of said blades having an elongated opening therein, and fluid pressure actuated means for exerting an expanding force on said cutter blades, said means including a pin extending into said openings for movement therein, said openings and pin being so positioned relative to each other that when said blades are in expanded position said pin and said fluid pressure means may move within the maximum limits without movement of said blades.

JOHN C. STOKES.

US266313A 1939-04-06 1939-04-06 Rotary underreamer Expired - Lifetime US2216895A (en)

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Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593035A (en) * 1949-01-08 1952-04-15 Victor S Karbowski Drill
US20030111267A1 (en) * 2000-06-28 2003-06-19 Pia Giancarlo T. Drill bits
US20030146023A1 (en) * 2000-08-11 2003-08-07 Giancarlo Pia Drilling apparatus
US6857487B2 (en) 2002-12-30 2005-02-22 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US6896075B2 (en) 2002-10-11 2005-05-24 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US6899186B2 (en) 2002-12-13 2005-05-31 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US6953096B2 (en) 2002-12-31 2005-10-11 Weatherford/Lamb, Inc. Expandable bit with secondary release device
US6994176B2 (en) 2002-07-29 2006-02-07 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US7004264B2 (en) 2002-03-16 2006-02-28 Weatherford/Lamb, Inc. Bore lining and drilling
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US7040420B2 (en) 1994-10-14 2006-05-09 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7048050B2 (en) 1994-10-14 2006-05-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7073598B2 (en) 2001-05-17 2006-07-11 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US7090021B2 (en) 1998-08-24 2006-08-15 Bernd-Georg Pietras Apparatus for connecting tublars using a top drive
US7093675B2 (en) 2000-08-01 2006-08-22 Weatherford/Lamb, Inc. Drilling method
US7096982B2 (en) 2003-02-27 2006-08-29 Weatherford/Lamb, Inc. Drill shoe
US7100710B2 (en) 1994-10-14 2006-09-05 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100713B2 (en) 2000-04-28 2006-09-05 Weatherford/Lamb, Inc. Expandable apparatus for drift and reaming borehole
US7108084B2 (en) 1994-10-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7117957B2 (en) 1998-12-22 2006-10-10 Weatherford/Lamb, Inc. Methods for drilling and lining a wellbore
US7128161B2 (en) 1998-12-24 2006-10-31 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US7128154B2 (en) 2003-01-30 2006-10-31 Weatherford/Lamb, Inc. Single-direction cementing plug
US7137454B2 (en) 1998-07-22 2006-11-21 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7140445B2 (en) 1997-09-02 2006-11-28 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US7147068B2 (en) 1994-10-14 2006-12-12 Weatherford / Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7188687B2 (en) 1998-12-22 2007-03-13 Weatherford/Lamb, Inc. Downhole filter
US7191840B2 (en) 2003-03-05 2007-03-20 Weatherford/Lamb, Inc. Casing running and drilling system
US7213656B2 (en) 1998-12-24 2007-05-08 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US7216727B2 (en) 1999-12-22 2007-05-15 Weatherford/Lamb, Inc. Drilling bit for drilling while running casing
US7219744B2 (en) 1998-08-24 2007-05-22 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US7228901B2 (en) 1994-10-14 2007-06-12 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7264067B2 (en) 2003-10-03 2007-09-04 Weatherford/Lamb, Inc. Method of drilling and completing multiple wellbores inside a single caisson
US7284617B2 (en) 2004-05-20 2007-10-23 Weatherford/Lamb, Inc. Casing running head
US7303022B2 (en) 2002-10-11 2007-12-04 Weatherford/Lamb, Inc. Wired casing
US7311148B2 (en) 1999-02-25 2007-12-25 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7325610B2 (en) 2000-04-17 2008-02-05 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US7334650B2 (en) 2000-04-13 2008-02-26 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US7360594B2 (en) 2003-03-05 2008-04-22 Weatherford/Lamb, Inc. Drilling with casing latch
US7370707B2 (en) 2003-04-04 2008-05-13 Weatherford/Lamb, Inc. Method and apparatus for handling wellbore tubulars
US7413020B2 (en) 2003-03-05 2008-08-19 Weatherford/Lamb, Inc. Full bore lined wellbores
US7503397B2 (en) 2004-07-30 2009-03-17 Weatherford/Lamb, Inc. Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US7617866B2 (en) 1998-08-24 2009-11-17 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US7857052B2 (en) 2006-05-12 2010-12-28 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing

Cited By (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2593035A (en) * 1949-01-08 1952-04-15 Victor S Karbowski Drill
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing oil and gas wells
US7165634B2 (en) 1994-10-14 2007-01-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7234542B2 (en) 1994-10-14 2007-06-26 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7228901B2 (en) 1994-10-14 2007-06-12 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7147068B2 (en) 1994-10-14 2006-12-12 Weatherford / Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7048050B2 (en) 1994-10-14 2006-05-23 Weatherford/Lamb, Inc. Method and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7100710B2 (en) 1994-10-14 2006-09-05 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7040420B2 (en) 1994-10-14 2006-05-09 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7013997B2 (en) 1994-10-14 2006-03-21 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7108084B2 (en) 1994-10-14 2006-09-19 Weatherford/Lamb, Inc. Methods and apparatus for cementing drill strings in place for one pass drilling and completion of oil and gas wells
US7140445B2 (en) 1997-09-02 2006-11-28 Weatherford/Lamb, Inc. Method and apparatus for drilling with casing
US7509722B2 (en) 1997-09-02 2009-03-31 Weatherford/Lamb, Inc. Positioning and spinning device
US7137454B2 (en) 1998-07-22 2006-11-21 Weatherford/Lamb, Inc. Apparatus for facilitating the connection of tubulars using a top drive
US7617866B2 (en) 1998-08-24 2009-11-17 Weatherford/Lamb, Inc. Methods and apparatus for connecting tubulars using a top drive
US7090021B2 (en) 1998-08-24 2006-08-15 Bernd-Georg Pietras Apparatus for connecting tublars using a top drive
US7219744B2 (en) 1998-08-24 2007-05-22 Weatherford/Lamb, Inc. Method and apparatus for connecting tubulars using a top drive
US7188687B2 (en) 1998-12-22 2007-03-13 Weatherford/Lamb, Inc. Downhole filter
US7117957B2 (en) 1998-12-22 2006-10-10 Weatherford/Lamb, Inc. Methods for drilling and lining a wellbore
US7128161B2 (en) 1998-12-24 2006-10-31 Weatherford/Lamb, Inc. Apparatus and methods for facilitating the connection of tubulars using a top drive
US7213656B2 (en) 1998-12-24 2007-05-08 Weatherford/Lamb, Inc. Apparatus and method for facilitating the connection of tubulars using a top drive
US7311148B2 (en) 1999-02-25 2007-12-25 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7216727B2 (en) 1999-12-22 2007-05-15 Weatherford/Lamb, Inc. Drilling bit for drilling while running casing
US7334650B2 (en) 2000-04-13 2008-02-26 Weatherford/Lamb, Inc. Apparatus and methods for drilling a wellbore using casing
US7325610B2 (en) 2000-04-17 2008-02-05 Weatherford/Lamb, Inc. Methods and apparatus for handling and drilling with tubulars or casing
US7712523B2 (en) 2000-04-17 2010-05-11 Weatherford/Lamb, Inc. Top drive casing system
US7100713B2 (en) 2000-04-28 2006-09-05 Weatherford/Lamb, Inc. Expandable apparatus for drift and reaming borehole
US7195085B2 (en) 2000-06-28 2007-03-27 Weatherford/Lamb, Inc. Drill bit
US20030111267A1 (en) * 2000-06-28 2003-06-19 Pia Giancarlo T. Drill bits
US7093675B2 (en) 2000-08-01 2006-08-22 Weatherford/Lamb, Inc. Drilling method
US20070144787A1 (en) * 2000-08-11 2007-06-28 Giancarlo Pia Drilling apparatus
US20030146023A1 (en) * 2000-08-11 2003-08-07 Giancarlo Pia Drilling apparatus
US7681667B2 (en) * 2000-08-11 2010-03-23 Weatherford/Lamb, Inc. Drilling apparatus
US7143847B2 (en) * 2000-08-11 2006-12-05 Weatherford/Lamb, Inc. Drilling apparatus
US7073598B2 (en) 2001-05-17 2006-07-11 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
US7004264B2 (en) 2002-03-16 2006-02-28 Weatherford/Lamb, Inc. Bore lining and drilling
US6994176B2 (en) 2002-07-29 2006-02-07 Weatherford/Lamb, Inc. Adjustable rotating guides for spider or elevator
US7090023B2 (en) 2002-10-11 2006-08-15 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US6896075B2 (en) 2002-10-11 2005-05-24 Weatherford/Lamb, Inc. Apparatus and methods for drilling with casing
US7303022B2 (en) 2002-10-11 2007-12-04 Weatherford/Lamb, Inc. Wired casing
US7083005B2 (en) 2002-12-13 2006-08-01 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US7730965B2 (en) 2002-12-13 2010-06-08 Weatherford/Lamb, Inc. Retractable joint and cementing shoe for use in completing a wellbore
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
US6899186B2 (en) 2002-12-13 2005-05-31 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US7131505B2 (en) 2002-12-30 2006-11-07 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US6857487B2 (en) 2002-12-30 2005-02-22 Weatherford/Lamb, Inc. Drilling with concentric strings of casing
US6953096B2 (en) 2002-12-31 2005-10-11 Weatherford/Lamb, Inc. Expandable bit with secondary release device
US7128154B2 (en) 2003-01-30 2006-10-31 Weatherford/Lamb, Inc. Single-direction cementing plug
USRE42877E1 (en) 2003-02-07 2011-11-01 Weatherford/Lamb, Inc. Methods and apparatus for wellbore construction and completion
US7096982B2 (en) 2003-02-27 2006-08-29 Weatherford/Lamb, Inc. Drill shoe
US7360594B2 (en) 2003-03-05 2008-04-22 Weatherford/Lamb, Inc. Drilling with casing latch
US7413020B2 (en) 2003-03-05 2008-08-19 Weatherford/Lamb, Inc. Full bore lined wellbores
US7191840B2 (en) 2003-03-05 2007-03-20 Weatherford/Lamb, Inc. Casing running and drilling system
US7370707B2 (en) 2003-04-04 2008-05-13 Weatherford/Lamb, Inc. Method and apparatus for handling wellbore tubulars
US7650944B1 (en) 2003-07-11 2010-01-26 Weatherford/Lamb, Inc. Vessel for well intervention
US7264067B2 (en) 2003-10-03 2007-09-04 Weatherford/Lamb, Inc. Method of drilling and completing multiple wellbores inside a single caisson
US7284617B2 (en) 2004-05-20 2007-10-23 Weatherford/Lamb, Inc. Casing running head
US7503397B2 (en) 2004-07-30 2009-03-17 Weatherford/Lamb, Inc. Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly
US7857052B2 (en) 2006-05-12 2010-12-28 Weatherford/Lamb, Inc. Stage cementing methods used in casing while drilling
US8276689B2 (en) 2006-05-22 2012-10-02 Weatherford/Lamb, Inc. Methods and apparatus for drilling with casing

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