US3102599A - Subterranean drilling process - Google Patents

Subterranean drilling process Download PDF

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US3102599A
US3102599A US13890661A US3102599A US 3102599 A US3102599 A US 3102599A US 13890661 A US13890661 A US 13890661A US 3102599 A US3102599 A US 3102599A
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drilling
bag
drill
bit
circulation
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Hillburn Edward
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ConocoPhillips Holding Co
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ConocoPhillips Holding Co
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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
    • E21B43/00Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02Subsoil filtering
    • E21B43/10Setting of casings, screens, liners or the like in wells
    • E21B43/103Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like
    • 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
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/003Means for stopping loss of drilling fluid
    • 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
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like
    • E21B33/138Plastering the borehole wall; Injecting into the formations

Description

Sept. 3, 1963 E. HILL-BURN SUBTERRANEAN DRILLING PROCESS Filed Sept. 18. 1961 FIG. 2

FIG.

INVENTOR. EDWARD HlLLBlURN a {2mm ATTORNEY United States Patent 3,102,599 SUBTERRANEAN DRILLING PROCESS Edward Hillbum, New Orleans, La., assignor to Continental Oil Company, Ponca City, Okla., a corporation of Delaware Filed Sept. 18, 1961, Ser. No. 138,906 2 Claims. (Cl. 175-72) This invention relates to the art of drilling oil and gas well boreholes. More particularly, the present invention concerns a method for sealing thief or lost zones encountered in penetrating unusually porous or creviced earth formations whereby circulation of drilling fluid can be readily and substantially completely restored.

My invention has particular applicability in the drilling of oil or gas wells by the rotary method. In such a method, drilling is performed by rotating a bit attached to the end of a hollow drill pipe which extends downwardly through the well bore. As the drill pipe is rotated from'the surface, the bit cuts or grinds away the encountered formations into small fragments known as cuttings which must be removed from the hole in order that the drilling may satisfactorily progress. To effect the removal of these cuttings, a fluid commonly referred to as a drilling mud is continuously pumped down the drill pipe, through channels or openings located in the extremity thereof and more usually in the drill bit itself, and thence up through the annular spacing between the drill pipe and the wall of the borehole to the surface of the earth. The drilling fluid conveys the cuttings produced by the drill bit .to the surface of the earth, serves as a lubricant for the drill bit and in addition accomplishes other desirable objectives. One of the most important of such other functions is that of forming a more or less fluid-impervious filter cake coating adjacent to the wall of the borehole which in turn prevents or substantially retards fluid in the borehole from penetrating into and being wasted in the surrounding earth formations. Also, this coating prevents or efiectively minimizes flow of liquids such as brine from the strata into the borehole thereby obviating dilution and consequent objectionable alteration of the characteristics of the drilling fluid.

As can be inferred from the above brief description of the general characteristics of drilling fluids, these materials, particularly the more effective types, are fairly complex in composition and comparatively expensive. Consequently, the loss of drilling fluids into the various earths strata penetrated by the borehole such as forma tions containing an usually porous, loose, creviced or fractured area presents one of the most difficult problems encountered in drilling operations. As a matter of fact, wholesale loss in this manner can figure predominately in the total cost for drilling a well and in some cases even necessitate an abandonment of the particular operation.

In view of the severity of the problem involved, numerous expedients have been heretofore proposed for solving same. Generally, the first expedient to be tried consists of pumping so-called circulation restoring materials into the well. These restorers embrace a wide variety of materials which serve to collect in the fracture and bridge therein to eventually seal the fracture. Conventional circulation restorers include such materials as granular plastics, textile flock and fibers, mica, asbestos, ground nut shells, shredded. or ground-up tire carcasses and the like. The drawback of this method is that it only has particular usefulness in sealing fractures which do not exceed about Ar-inch in width.

In the event the foregoing expedient is-not applicable, a more drastic procedure is called for, such as the placement of a sealing plug that hardens or stiifens inside the fracture and adjacent to the well bore area containing 3,1fi2,599 Patented Sept. 3, 1963 the fracture. The time setting or cementitious material employed in the practice of plugging can suitably be a hydraulic inorganic cement or a resinous cement. The usual difiiculties encountered in the aforedescribed plugging treatment are the lack of control of the placing of the sealing material and oftentimes the substantial loss of cement experienced before proper setting and sealing has occurred.

In accordance with this invention there is provided a simple method for sealing lost circulation zones which is especially applicable in the event use of circulation restoring materials has failed to affect adequate sealing. Briefly stated, the method of this invention initially cornprises withdrawing the drill pipe and bit assembly upon encountering a lost zone and after drilling adjacently therebeyond. Upon withdrawal, there is snugly positioned about the drill bit and for the neighboring portion of the drill pipe, a bag fabricated from a liquid impervious membranaceous material. The drill bit is returned to drilling position and pumping of the drilling mud through the drill pipe is commenced. The mul inflates the bag forcing it against the formation face. Continued pumping forces the top of the bag away from the drill pipe and thus circulation is facilitated. Drilling is then commenced through the bottom of the bag and the differential of pressure existing between the lost circulation zone and the well bore maintains the bag sealed in place to the wall of the hole.

Further details illustrating this method can be noted by referring to the accompanying drawing wherein:

FIGURE 1 is a cross-sectional elevational view of the drill pipe-bit assembly specifically illustrating a manner of attaching a membranaceous bag to said assembly in accordance with this invention; and

FIGURE 2 illustrates the position of the inflatable bag shown in FIGURE 1 after circulation of the drilling fluid has been regained and prior to further drilling.

Referring specifically to FIGURE 1, a hollow drill pipe is shown at 10 disposed within a well borehole 11 which borehole penetrates an area of lost circulation at 12. The drill bit 13 is attached to the extremity of drill pipe 10 and the latter together with a portion of the drill pipe extending upwardly from the top-most extremity of the zone 12 is encompassed with a substantially liquid impervious bag member 14. In the particular embodiment shown, the top of the bag is sealingly attached to the drill pipe 10 by means of a suitable clamp shown at 15 in the drawing. This clamp may be a metallic spring clamp or may simply comprise strong rubber bands. Additionally, while not shown in the drawing, it is desirable to place a plurality of stretchable rubber bands or expandable metal clamps along the whole length of the bag so that in a noninflatable position the bag adheres relatively close to the periphery of the drill pipe. The

diameter of the bag is primarily dependent on the nature of the bag employed. For example, in utilizing a bag fabricated of relatively unyielding material, it is generally desirable to employ a diameter conforming essentially to or slightly larger than the diameter of the well at the lost zone. as for example rubber, more latitude as to undersizing can obviously be tolerated. It is to be noted that the bit rests on the bottom of the borehole which had been previously extended beyond the thief zone. The extent to which the drilling beyond the thief zone is accomplished depends principally on the width of the lost zone.

Generally, such an extension need not exceed about half the total width of the lost'zone. Correspondingly, it is desirable to have the top of the bag extend above the lost zone for a distance approximately equal to one half the total width of the lost zone. It warrants mentioning that Of course, where stretchable materials are used,

3 the necessary drilling contemplated for drilling beyond most lost zones can be accomplished by dry drilling.

The bag 14, as indicated previously, can be fabricated of any substantially liquid impervious material. For this purpose, canvas can be used or more preferably the bag can be fabricated of a plastic. The plastic may take the form of a film thereof or may be in the form of a woven fabric. As notable examples of clear self-sustaining plastic-films, which can be used for the purposes herein, there are polyethylene, polypropylene, the so-called super condensation polymers, and the like. Suitable plastic cloths from which the bag can be constructed include nylon and other strong synthetic fiber-based fabrics.

As indicated, FIGURE 2 illustrates the position the bag assumes once drilling mud is caused to be pumped through the drill pipe. The direction of flow of the drilling fluid is shown by the arrows in FIGURE 2. Thus, it can be seen that the drilling fluid progresses downwardly through the drill pipe and out from channels or holes contained in or near the vicinity of the drill bit and thence flows upwardly through the bag thereby forcing the top of the bag from the drill pipe. The drilling fluid then returns to the top of the well for recovery and subsequent reintroduction into the operation. As shown in FIGURE 2, the surface of the expander bag conforms to the surface of the area of lost circulation. This is accomplished by the differential of pressure existing between the interior of the well borehole and the lost circulation zone 12. This pressure difference will maintain the bag in a sealing position even though drilling is commenced through and beyond the lower extremity of encompassing bag.

When the well borehole is completed or any time prior thereto, a casing may be run through the bag and cemented. In such an operation, the positioned bag also serves to prevent loss of cement. If additional trips should be required before setting a casing, the hole size may be reduced from about A to /2-inch and a drillable guide run on the bit So as to facilitate insertion of the bit through the sealing member adjacent to the zone of lost circulation. This guide may be made of any soft drillable material such as plaster of Paris, etc.

As is evident from the above description, it is essential that the bag remain intact in the course of lowering the bit into the bottom of the well. Accordingly, it is oftentimes desirable, either because of the nature of the bag material used or the particular abrasive character of the various strata through which the bag is lowered, to protect the portion about the bit against rupture. Several ways may be employed to protect this susceptible portion Ki of the bag. One convenient way consists of encasing the portion of the bag about the bit with a highly abrasiveresistant d-rillable material such as a thin sheath of readily drillable metal, as for example, aluminum, magnesium, etc. Ordinarily, in the practice of my method, it is desirable to run a caliper survey in the borehole upon withdrawing the bit. With the information obtained in such a survey, a new bit size is preferably chosen having a diameter less than the minimum diameter noted for the borehole.

The above describes completely a preferred manner of carrying out the present invention. Variations of this particular mode as may readily appear to those skilled in the art are also contemplated. Accordingly, it is to be pointed out that the scope of the invention is not limited to any of the details enumerated hereinbelow except as these details are included as limitations within the appended claims.

I claim:

1. A method of drilling a well borehole penetrating a thief formation whereby drilling fluid circulation is maintained which comprises: withdrawing the drill bit after encountering a zone of lost circulation and drilling adjacently therebeyond; adherently positioning a bag substantially impervious to liquids about the drill bit, said bag having a length exceeding the width of the zone of lost circulation; returning the drill bit to drilling position; introducing drilling fluid through the drill bit thereby expanding and sealingly positioning the wall of the said bag aga-inst said lost circulation zone; and commencing drilling under substantially full fluid circulation condi tions.

2. A method in accordance with claim 1 wherein said substantially liquid impervious bag is a plastic bag.

References Cited in the file of this patent UNITED STATES PATENTS France Oct. 10, 1 960

Claims (1)

1. A METHOD OF DRILLING A WELL BOREHOLE PENETRATING A THIEF FORMATION WHEREBY DRILLING FLUID CIRCULATION IS MAINTAINED WHICH COMPRISES: WITHDRAWING THE DRILL BIT AFTER ENCOUNTERING A ZONE OF LOST CIRCULATION AND DRILLING ADJACENTLY THEREBEYOND; ADHERENTLY POSITIONING A BAG SUBSTANTIALLY IMPERVIOUS TO LIQUIDS ABOUT THE DRILL BIT, SAID BAG HAVING A LENGTH EXCEEDING THE WIDTH OF THE ZONE OF LOST CIRCULATION; RETURNING THE DRILL BIT TO DRILLING POSITION; INTRODUCING DRILLING FLUID THROUGH THE DRILL BIT THEREBY EXPANDING AND SEALINGLY POSITIONING THE WALL OF THE SAID BAG AGAINST SAID LOST CIRCULATION ZONE; AND COMMENCING DRILLING UNDER SUBSTANTIALLY FULL FLUID CIRCULATION CONDITIONS.
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Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003078790A1 (en) * 2002-03-16 2003-09-25 Weatherford/Lamb, Inc. Lining and drilling a wellbore with an expandable bit
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
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
WO2008003184A1 (en) * 2006-07-03 2008-01-10 Mathias Broder Method for sealing the walls of deep drilled hole
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
US20090032257A1 (en) * 2005-02-10 2009-02-05 Christophe Rayssiguier Method and Apparatus for Consolidating a Wellbore
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

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CA594055A (en) * 1960-03-08 J. Teplitz Abraham Method and device for sealing a borehole wall
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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
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
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
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
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
US7036610B1 (en) 1994-10-14 2006-05-02 Weatherford / Lamb, Inc. Apparatus and method for completing 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
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
US7219744B2 (en) 1998-08-24 2007-05-22 Weatherford/Lamb, Inc. Method and apparatus for connecting 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
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
US7093675B2 (en) 2000-08-01 2006-08-22 Weatherford/Lamb, Inc. Drilling method
US7073598B2 (en) 2001-05-17 2006-07-11 Weatherford/Lamb, Inc. Apparatus and methods for tubular makeup interlock
WO2003078790A1 (en) * 2002-03-16 2003-09-25 Weatherford/Lamb, Inc. Lining and drilling a wellbore with an expandable bit
GB2393989B (en) * 2002-03-16 2005-12-07 Weatherford Lamb Lining and drilling a wellbore with an expandable bit
GB2393989A (en) * 2002-03-16 2004-04-14 Weatherford Lamb Lining and drilling a wellbore with an expandable bit
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
US7303022B2 (en) 2002-10-11 2007-12-04 Weatherford/Lamb, Inc. Wired casing
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
US7083005B2 (en) 2002-12-13 2006-08-01 Weatherford/Lamb, Inc. Apparatus and method of drilling with casing
US7938201B2 (en) 2002-12-13 2011-05-10 Weatherford/Lamb, Inc. Deep water drilling with casing
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