|Publication number||US3908759 A|
|Publication date||Sep 30, 1975|
|Filing date||May 22, 1974|
|Priority date||May 22, 1974|
|Publication number||US 3908759 A, US 3908759A, US-A-3908759, US3908759 A, US3908759A|
|Inventors||Cagle William S, Dillard Fred H|
|Original Assignee||Standard Oil Co|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (4), Referenced by (102), Classifications (11), Legal Events (1)|
|External Links: USPTO, USPTO Assignment, Espacenet|
United States Patent 1 Cagle et a1. 7
1 1 Sept. 30, 1975 Filed:
H. Dillard, Lake Charles, La.
Standard Oil Company, Chicago, 111.
May 22, 1974 US. Cl l66/ll7.6; 166/298 Int. Cl. E21B 7/08 Field of Search 166/1 17.5, 117.6, 297;
References Cited UNITED STATES PATENTS Primary E.\'amilzerDavid H. Brown Attorney, Agent, or Firm.lohn D. Gassett; Paul F. Hawlcy 1 1 ABSTRACT A new apparatus and method are described for sidetracking a hole drilled in the earth and lined with casing. A modified bridge plug having a latch-up device on top is set using an electric cable in the casing at a point just below where it is desired to drill through the casing wall. A casing whipstock with a latch-up device to match that on the bridge plug is then run to latch up with the latch-up on the bridge plug. The whipstock is sheared and a window is started with a starting mill of the whipstock. A specially modified diamond side-track bit is then used to finish cutting the casing window and milling the window and starting a sidetracked hole in the formation.
3 Claims, 6 Drawing Figures US. Patent Sept. 30,1975 Sheet 2 of2 3,908,759
FlGi /4o 'ililllllllllllll llll SIDETRACKING TOOL BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to side-tracking a casing-lined borehole drilled in the earth. The invention relates especially to an apparatus and method for performing side-tracking of a wellbore through a casing.
2. Setting of the Invention Oil and gas are produced from underground formations through wellbores drilled from the surface to the formation. Ordinarily, the wellbores are lined with a steel pipe called a casing. Many times it is desired to change the direction the well is being drilled after casing has been set. Sometimes it is impossible to drill ahead because of unretrievable non-drillable junk in the wellbore. This drilling through the wall of the casing and changing the direction of the borehole is com monly called side-tracking. There has been a large number of apparatus and methods developed for sidetracking operations. A typical and widely used method and apparatus is displayed on page 202, of the Composite Catalog of Oil Field Equipment & Services, Vol. 1, 31st Revision, 1974-75, published by World Oil, a Gulf Publishing Company publication, P. O. Box 2608, Houston, Texas.
Two techniques are commonly used for side-tracking out of existing casings (1) mill a section, or (2) mill a window. In the first technique, i.e., milling a section, the entire section of casing between two levels is completely cut away. There are various ways of obtaining a mill section, but they practically all have certain disadvantages, such as:
l. Tendency of commercially available permanent whipstock which are normally used to rotate;
2. Excess of metal cuttings which become magnetized and cause downhole plugging problems;
3. Difficulty in getting a cement plug across the milled section; and
4. Normally, more round trips of the drill pipe are required than with the present invention. (A round trip is the lowering of drill pipes into the well and adding joints thereto as the pipe is lowered until the bottom part of the drill pipe is at the desired level, and then pulling the casing in a reverse procedure until the bottom of the'drill pipe is out of the hole.)
In some side-tracking operations,- only a window is cut in the casing. As the name implies, cutting a window is really just cutting a hole in the side of the casing. Thus, there are fewer metal cuttings in the hole to cause trouble than when a complete section is milled away. There are still some disadvantages to using a window-milling technique. These include the large amount of time consumed because two or three window mills are required to finish a window, especially in harder steel casing. Each time a new window mill is used, the drill string must be pulledand re-run. Also, an extra trip with the string mill is usually required to clean up the window before drilling ahead with the conventional bit. These disadvantages increase the cost of many sidetracking jobs and could make some completely uneconomical.
Present whipstocks can sometimes turn and move up the hole either initially or at a later time. If this happens, the hole is lost and the side-tracking procedure must be repeated all over again. As mentioned suave; casing whipstocks are commercially availaBli: Meet casing whipstocks have a lower portion which has slips which are anchored to the walls of the casing, and an upper part which has a sloping face, and which is really the whipstock part. The upper whipstock part and the lower anchoring portion are run in the well as a unit. It is most difficult to obtain good anchoring with this sytem again either longitudinal or rotational movement in the wellbore.
BRIEF DESCRIPTION OF THE INVENTION This invention includes a novel apparatus for milling a window and a novel method of side-tracking using a novel diamond-type bit. We first modify a downhole packer or bridge plug to have a special latch-up device on top. We then use an electric line and set the bridge plug at the desired depth. We modify a permanent casing whipstock to have a latch-up device at its lower end to match with the latch-up device on top of the bridge plug. We then run and set the casing whipstock latched firmly to the set bridge plug; This prevents the whipstock from turning or moving up the hole. The upper end of the whipstock is held to a starting mill connected to the lower end of a drill string by a shear pin. At this point in the operation, we shear off the shear pin by applying weight to the drill string. We start a window in the side of the casing with the starting mill.
After the starting mill has made its pilot hole through the casing, we pull the drill string and the starting mill and replace the starting mill with a special diamond side-track-bit with which we complete the job of cutting the window. The specially modified diamond bit is different from conventional bits in several respects: (1) its throat is off-center; (2) it has no junk slots on the sides; and (3) the bottom side is substantially flat.
- I BRIEF DESCRIPTION OF THE DRAWINGS Various objectives and a better understanding can be had of the invention from the following description taken in conjunction with the drawings, in which:
FIG. 1 illustrates the overall assembly in full face view set in a casing in cutaway view;
FIG. 2 illustrates, partly in cross section, a downhole assembly, including a modified bridge plug, a whipstock, and latching means to latch the whipstock to the bridge plug means;
FIG. 3 is similar to FIG. 2, except the whipstock is latched into position and the latching means attached to the bridge plug; I
FIG. 4 illustrates a portion of the hollow extension on the bridge plug;
.FIG. 5 is a side view of the diamond bit useful in this invention; and
FIG. 6 is a bottom view of the diamond bit shown in FIG. 5.
DETAILED DESCRIPTION OF THE INVENTION Attention is first directed to FIG. 1 to show the general environment in which the system operates. Shown therein, is a hole 10 lined with a casing 12. It is desired to drill out through the casing 12 at the level 14. Shown inside casing 12, is bridge plug 16, having extension 18. Above extension 18 is a whipstock 20, which has a lower extension 22, which latches with the upper extension 18 of the bridge plug 16. A tubing string 24 is suspended in the wellbore above whipstock 20, and supports a starting mill 26 and pilot 28. The pilot 28 is held if) the upper end of whipstock 20 by a shear pin 30.
Attention is next directed to FIG. 2. Shown therein in the lower portion of casing 12 is bridge plug 16, which may be, for example, a Baker Mercury Model NC wireline casing bridge plug, available from Baker Oil Tools, Inc., P. O. 7400, E. Slauson Ave., Los Angeles, Calif. A hollow extension 34 is connected to the top side of bridge plug 16. The upper edge of extension 34 has annular upwardly facing shoulders 36. Just below shoulders 36, is a latching groove 38 on the internal wall of extension 34. Also provided, are splines 40 (see FIG. 4) on the interior wall of extension 34. Groove 38 is shielded by cup-shaped shield 42, which is held in position by shear pins 44. Whipstock 20 has a modified lower latching means. This includes a stepped cylinder extension which includes a first portion 48 and a smaller reduced portion 50. Extension 50 is sized to be received in cup 42. An annular shoulder 52 is provided between the stepped extension and is designed to fit onto shoulder 75 of cup-shaped shield 42 of the bridge plug 16. Section 48 has latching dogs 54, which are designed to fit into latching groove 38 of extension 34 of the bridge plug 16.
Attention will now be given to the operation of the setting of the device of FIG. 2 to reach the position of FIG. 3. It is important to note that the shear pin 44 has a lower shear point than does shear pin 30. The first thing that is done, after bridge plug 16 has been modified as shown in FIG. 4, is to set the bridge plug by a wireline assembly, not shown but which is well known. The setting tool commonly used is found on page 404, of Composite Catalog, and is connected to the bridge plug 16 by a setting mandrel extending from the setting tool through the hole 77 in the cup-shaped shield 42 to the bridge plug 16. After setting the bridge plug 16, the setting mandrel shears out of the bridge plug 16.
The whipstock 20 with its extension, as shown in FIG. 2, is next connected to a drill string, similarly in a manner to that shown in FIG. 1. The Whipstock is then lowered by lowering the drill string until extension 50 fits into cup 42. This point can be detected by a reduced weight on the drill string. At this time, we orient the Whipstock to the desired direction, if that is required. We next set down weight on the drill string and shear shear pin 44. This causes cup 42 to be shoved down to where the Whipstock will be in its lower position with respect to the bridge plug and its extension, and shoulders 76 of the Whipstock extension will rest on shoulders 36 of extension 34 of the bridge plug. At this time, dogs 54 are firmly latched into grooves 38 of the bridge plug extension. The Whipstock is prevented from rotating by the splines 49 of its extension mating with the splines 40 of the bridge plug extension. The Whipstock is prevented from vertical movement by dogs 54, which are latched firmly into latching groove 38 of the bridge plug extension.
We next set down sufficient weight on the drill pipe to shear shear pin 30 and then begin rotating the drilling assembly. The pilot 28 follows along the plane of the Whipstock 20 until the starting mill 26 cuts into the casing. After the pilot hole has been cut in the wall of the casing by the starting mill and the pilot extends about 2 feet below the top of the Whipstock, the drill string is pulled to the surface. At this time, we remove the starting mill 26 and pilot 28 and replace it with a modified diamond bit, shown in FIGS. and 6. This modified bit is used to complete the cutting of the window in the wall of the casing and can be used to drill several feet into the formation. At this point, we again pull the drill string and replace the modified diamond bit with a conventional bit most suited for drilling the formation at this particular interval.
Following the above procedure can reduce the cost of prior side-tracking methods by as much as $20,000 (for an operation costing $3,500 per day) by eliminating as many as four round trips.
Attention is next directed to FIGS. 5 and 6 which show the modified diamond drill bit. FIG. 5 is a side view and there are no junk grooves or slots along the side 70. The bottom of the bit has been modified considerably from normal bits. It has a center 72; however, the throat is not at the center of the bit. The throat or fluid courses 74 are off center. The reason for this is that, when the throat is in the center of the bit, the casing cuttings tend to clog it, but, when it is not in the center, clogging does not occur. We have found that the most suitable size diamonds for cutting casing is in the range of about 8 l2 stones/carat. In all other repsects, the diamond bit can be made along conventional manufacturing procedures.
While the above description has been made in detail, various modifications can be made thereto without departing from the spirit or scope of the invention.
1. A downhole device for setting in a cased wellbore, from which it is desired to drill a side-tracked well, which comprises:
an anchor means for anchoring in said cased borehole;
an anchor means extension extending upwardly from said anchor means, and including latching means having:
a hollow cylindrical member having an internal latching groove near its upper end;
internal spline means on the internal surface of the said cylindrical member;
a cup-like member set in said cylindrical member;
a first shear pin holding said cup-like member to said cylindrical member;
a Whipstock extension including a lower cylindrical member for fitting into said cup-like member and an intermediate cylindrical portion above said lower portion and having external splines thereon, said external splines matching the internal splines of said cylindrical member of said anchor means extension when inserted therein;
latching dogs on said intermediate member of said Whipstock extension for latching into said latching grooves of said anchor means cylindrical member.
2. Apparatus, as defined in claim 1, including a second shear pin in the upper portion of said Whipstock and extending horizontally beyond the face of said Whipstock, said second shear pin having a highershear strength than said first shear pin.
3. Apparatus, as defined in claim 2, including a drill string suspended in said cased borehole, a starting mill with pilot connected to the lower end of said drill string, the lower end of said pilot being connected to said second shear pin.
|Cited Patent||Filing date||Publication date||Applicant||Title|
|US1851319 *||Oct 17, 1930||Mar 29, 1932||Blackwell And Sunde Better Sur||Method of diverting alpha well drilling tool|
|US2020471 *||Dec 3, 1934||Nov 12, 1935||Layne Leslie A||Whipstock packer|
|US2105722 *||Nov 20, 1935||Jan 18, 1938||Barrett George J||Well-boring apparatus|
|US2653007 *||Nov 3, 1948||Sep 22, 1953||Sun Oil Co||Apparatus for orienting tools|
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US4153109 *||May 19, 1977||May 8, 1979||Baker International Corporation||Method and apparatus for anchoring whipstocks in well bores|
|US4285399 *||Jul 21, 1980||Aug 25, 1981||Baker International Corporation||Apparatus for setting and orienting a whipstock in a well conduit|
|US4304299 *||Jul 21, 1980||Dec 8, 1981||Baker International Corporation||Method for setting and orienting a whipstock in a well conduit|
|US4397355 *||May 29, 1981||Aug 9, 1983||Masco Corporation||Whipstock setting method and apparatus|
|US5035292 *||Jan 11, 1989||Jul 30, 1991||Masx Energy Service Group, Inc.||Whipstock starter mill with pressure drop tattletale|
|US5109924 *||Dec 17, 1990||May 5, 1992||Baker Hughes Incorporated||One trip window cutting tool method and apparatus|
|US5113938 *||May 7, 1991||May 19, 1992||Clayton Charley H||Whipstock|
|US5199513 *||Feb 11, 1991||Apr 6, 1993||Tri-State Oil Tool (Uk)||Side-tracking mills|
|US5361833 *||Nov 18, 1993||Nov 8, 1994||Triumph*Lor, Inc.||Bottom set, non-retrievable whipstock assembly|
|US5409060 *||Apr 4, 1994||Apr 25, 1995||Weatherford U.S., Inc.||Wellbore tool orientation|
|US5425417 *||Sep 6, 1994||Jun 20, 1995||Weatherford U.S., Inc.||Wellbore tool setting system|
|US5437340 *||Jun 23, 1994||Aug 1, 1995||Hunting Mcs, Inc.||Millout whipstock apparatus and method|
|US5452759 *||Sep 10, 1993||Sep 26, 1995||Weatherford U.S., Inc.||Whipstock system|
|US5474126 *||May 16, 1994||Dec 12, 1995||Baker Hughes Incorporated||Retrievable whipstock system|
|US5522461 *||Mar 31, 1995||Jun 4, 1996||Weatherford U.S., Inc.||Mill valve|
|US5592991 *||May 31, 1995||Jan 14, 1997||Baker Hughes Inc.||Method and apparatus of installing a whipstock|
|US5620051 *||Jun 3, 1996||Apr 15, 1997||Weatherford U.S., Inc.||Whipstock|
|US5697445 *||Sep 27, 1995||Dec 16, 1997||Natural Reserves Group, Inc.||Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means|
|US5715891 *||Sep 27, 1995||Feb 10, 1998||Natural Reserves Group, Inc.||Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access|
|US5720349 *||Oct 12, 1995||Feb 24, 1998||Weatherford U.S., Inc.||Starting mill and operations|
|US5727629 *||Jan 24, 1996||Mar 17, 1998||Weatherford/Lamb, Inc.||Wellbore milling guide and method|
|US5730221 *||Jul 15, 1996||Mar 24, 1998||Halliburton Energy Services, Inc||Methods of completing a subterranean well|
|US5740864 *||Jan 29, 1996||Apr 21, 1998||Baker Hughes Incorporated||One-trip packer setting and whipstock-orienting method and apparatus|
|US5743331 *||Sep 18, 1996||Apr 28, 1998||Weatherford/Lamb, Inc.||Wellbore milling system|
|US5769166 *||Oct 10, 1996||Jun 23, 1998||Weatherford/Lamb, Inc.||Wellbore window milling method|
|US5771972 *||May 3, 1996||Jun 30, 1998||Smith International, Inc.,||One trip milling system|
|US5787978 *||Nov 19, 1996||Aug 4, 1998||Weatherford/Lamb, Inc.||Multi-face whipstock with sacrificial face element|
|US5803176 *||Jul 15, 1996||Sep 8, 1998||Weatherford/Lamb, Inc.||Sidetracking operations|
|US5806600 *||Oct 10, 1996||Sep 15, 1998||Halford, Sr.; Hubert E.||Whipstock system|
|US5813465 *||Jul 15, 1996||Sep 29, 1998||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US5816324 *||May 3, 1996||Oct 6, 1998||Smith International, Inc.||Whipstock accelerator ramp|
|US5826651 *||Jul 30, 1996||Oct 27, 1998||Weatherford/Lamb, Inc.||Wellbore single trip milling|
|US5833003 *||Jul 15, 1996||Nov 10, 1998||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US5836387 *||Aug 13, 1997||Nov 17, 1998||Weatherford/Lamb, Inc.||System for securing an item in a tubular channel in a wellbore|
|US5862862 *||Jul 15, 1996||Jan 26, 1999||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US5871046 *||Aug 11, 1997||Feb 16, 1999||Halliburton Energy Services, Inc.||Orienting, retrievable whipstock anchor|
|US5878818 *||May 28, 1998||Mar 9, 1999||Smith International, Inc.||Mechanical set anchor with slips pocket|
|US5887655 *||Jan 30, 1997||Mar 30, 1999||Weatherford/Lamb, Inc||Wellbore milling and drilling|
|US5887668 *||Apr 2, 1997||Mar 30, 1999||Weatherford/Lamb, Inc.||Wellbore milling-- drilling|
|US5894889 *||Aug 21, 1997||Apr 20, 1999||Smith International, Inc.||One trip milling system|
|US5947201 *||Feb 6, 1996||Sep 7, 1999||Baker Hughes Incorporated||One-trip window-milling method|
|US5979571 *||Sep 23, 1997||Nov 9, 1999||Baker Hughes Incorporated||Combination milling tool and drill bit|
|US5992524 *||Sep 13, 1997||Nov 30, 1999||Natural Reserves Group, Inc.||Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access|
|US6024168 *||Oct 31, 1997||Feb 15, 2000||Weatherford/Lamb, Inc.||Wellborne mills & methods|
|US6032740 *||Jan 23, 1998||Mar 7, 2000||Weatherford/Lamb, Inc.||Hook mill systems|
|US6035939 *||Nov 9, 1998||Mar 14, 2000||Weatherford/Lamb, Inc.||Wellbore anchor system|
|US6056056 *||Jan 18, 1998||May 2, 2000||Durst; Douglas G.||Whipstock mill|
|US6059037 *||Jun 30, 1998||May 9, 2000||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US6070667 *||Feb 5, 1998||Jun 6, 2000||Halliburton Energy Services, Inc.||Lateral wellbore connection|
|US6076602 *||Jul 1, 1998||Jun 20, 2000||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US6092601 *||Jun 30, 1998||Jul 25, 2000||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US6112812 *||Jan 6, 1998||Sep 5, 2000||Weatherford/Lamb, Inc.||Wellbore milling method|
|US6116336 *||Apr 25, 1997||Sep 12, 2000||Weatherford/Lamb, Inc.||Wellbore mill system|
|US6116344 *||Jul 1, 1998||Sep 12, 2000||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US6131675 *||Sep 8, 1998||Oct 17, 2000||Baker Hughes Incorporated||Combination mill and drill bit|
|US6135206 *||Jul 1, 1998||Oct 24, 2000||Halliburton Energy Services, Inc.||Apparatus for completing a subterranean well and associated methods of using same|
|US6155349 *||Mar 3, 1998||Dec 5, 2000||Weatherford/Lamb, Inc.||Flexible wellbore mill|
|US6209645||Apr 16, 1999||Apr 3, 2001||Schlumberger Technology Corporation||Method and apparatus for accurate milling of windows in well casings|
|US6267179||Mar 3, 2000||Jul 31, 2001||Schlumberger Technology Corporation||Method and apparatus for accurate milling of windows in well casings|
|US6283208 *||Apr 16, 1999||Sep 4, 2001||Schlumberger Technology Corp.||Orienting tool and method|
|US6302198||Nov 29, 1999||Oct 16, 2001||Canadian Downhole Drill System||One trip milling system|
|US6318466||Mar 6, 2000||Nov 20, 2001||Schlumberger Technology Corp.||Method and apparatus for accurate milling of windows in well casings|
|US6405804||Mar 9, 2000||Jun 18, 2002||Schlumberger Technology Corporation||Method and apparatus for retrieving a deflecting tool|
|US6419012 *||Jun 15, 2001||Jul 16, 2002||Schlumberger Technology Corporation||Deviated borehole drilling assembly|
|US6454007||Jun 30, 2000||Sep 24, 2002||Weatherford/Lamb, Inc.||Method and apparatus for casing exit system using coiled tubing|
|US6488090||Oct 23, 2000||Dec 3, 2002||Schlumberger Technology Corporation||Method and apparatus for accurate milling of windows in well casings|
|US6648068||Apr 30, 1999||Nov 18, 2003||Smith International, Inc.||One-trip milling system|
|US6880631 *||Mar 24, 2000||Apr 19, 2005||Smith International Inc.||Whipstock casing milling system|
|US7096962 *||Oct 1, 2002||Aug 29, 2006||Smith International, Inc.||Wellbore recovery operation|
|US7207401||Oct 14, 2003||Apr 24, 2007||Smith International, Inc.||One trip milling system|
|US7481282||May 11, 2006||Jan 27, 2009||Weatherford/Lamb, Inc.||Flow operated orienter|
|US7946361||Jan 16, 2009||May 24, 2011||Weatherford/Lamb, Inc.||Flow operated orienter and method of directional drilling using the flow operated orienter|
|US7994101 *||Dec 12, 2006||Aug 9, 2011||Halliburton Energy Services, Inc.||Corrosion inhibitor intensifier compositions and associated methods|
|US7994102 *||Apr 1, 2008||Aug 9, 2011||Baker Hughes Incorporated||Method of treating an alloy surface with an alkyl sarcosinate|
|US8058211||Dec 12, 2007||Nov 15, 2011||Halliburton Energy Services, Inc.||Corrosion inhibitor intensifier compositions and associated methods|
|US8357640 *||May 25, 2011||Jan 22, 2013||Baker Hughes Incorporated||Method of inhibiting corrosion with an alkyl sarcosinate|
|US9062496 *||Feb 6, 2013||Jun 23, 2015||Halliburton Energy Services, Inc.||Systems and methods for rotationally orienting a whipstock assembly|
|US9546530 *||Nov 18, 2013||Jan 17, 2017||Baker Hughes Incorporated||Convertible downhole devices|
|US20040089443 *||Oct 14, 2003||May 13, 2004||Smith International, Inc.||One trip milling system|
|US20040238171 *||Oct 1, 2002||Dec 2, 2004||Mcgarian Bruce||Wellbore recovery operation|
|US20060254824 *||May 11, 2006||Nov 16, 2006||Horst Clemens L||Flow operated orienter|
|US20080139414 *||Dec 12, 2006||Jun 12, 2008||Halliburton Energy Services, Inc.||Corrosion inhibitor intensifier compositions and associated methods|
|US20090156432 *||Dec 12, 2007||Jun 18, 2009||Halliburton Energy Services, Inc.||Corrosion inhibitor intensifier compositions and associated methods|
|US20090183921 *||Jan 16, 2009||Jul 23, 2009||Rishi Gurjar||Flow operated orienter|
|US20090247431 *||Apr 1, 2008||Oct 1, 2009||D V Gupta||Biodegradable anionic acid corrosion inhibitor comprising sarcosines|
|US20110224111 *||May 25, 2011||Sep 15, 2011||D V Satyanarayana Gupta||Biodegradable anionic acid corrosion inhibitor comprising sarcosines|
|US20140124215 *||Nov 18, 2013||May 8, 2014||Baker Hughes Incorporated||Convertible Downhole Devices|
|US20140216760 *||Feb 6, 2013||Aug 7, 2014||Halliburton Energy Services, Inc.||Systems and Methods for Rotationally Orienting a Whipstock Assembly|
|USRE43054 *||Sep 24, 2004||Jan 3, 2012||Weatherford/Lamb, Inc.||Method and apparatus for casing exit system using coiled tubing|
|DE3942438A1 *||Dec 22, 1989||Jul 11, 1991||Eastman Christensen Co||Vorrichtung zum bohren einer neben- oder ablenkbohrung eines insbesondere verrohrten bohrlochs|
|EP0442675A2 *||Feb 11, 1991||Aug 21, 1991||Tri-State Oil Tool (UK), a division of Baker Hughes Limited||Milling tool for well side-tracking|
|EP0442675A3 *||Feb 11, 1991||Sep 16, 1992||Tri-State Oil Tool (Uk), A Division Of Baker Hughes Limited||Milling tool for well side-tracking|
|EP0901559A1 *||May 22, 1997||Mar 17, 1999||Baroid Technology, Inc.||Multicut window mill|
|EP0901559A4 *||May 22, 1997||Mar 20, 2002||Baroid Technology Inc||Multicut window mill|
|EP0935049A3 *||Feb 3, 1999||Sep 12, 2001||Halliburton Energy Services, Inc.||Wellbore apparatus and methods|
|WO1995014153A1 *||Nov 2, 1994||May 26, 1995||Triumph*Lor, Inc.||Bottom set, non-retrievable whipstock assembly|
|WO1995033910A1 *||Jun 8, 1995||Dec 14, 1995||Shell Internationale Research Maatschappij B.V.||Whipstock assembly|
|WO1997012112A1||Sep 25, 1996||Apr 3, 1997||Natural Reserves Group, Inc.||Method for isolating multi-lateral well completions while maintaining selective drainhole re-entry access|
|WO1997012113A1||Sep 25, 1996||Apr 3, 1997||Natural Reserves Group, Inc.||Method and apparatus for selective horizontal well re-entry using retrievable diverter oriented by logging means|
|WO1998004804A1 *||Jul 30, 1997||Feb 5, 1998||Weatherford/Lamb, Inc.||Apparatus and method for milling a hole in casing|
|WO1998034007A1 *||Jan 30, 1998||Aug 6, 1998||Weatherford/Lamb, Inc.||Tool and method for drilling a lateral well|
|WO2002002903A1||Jun 22, 2001||Jan 10, 2002||Weatherford/Lamb, Inc.||Milling of casing using coiled tubing|
|U.S. Classification||166/117.6, 166/298|
|International Classification||E21B29/00, E21B7/04, E21B7/08, E21B7/06, E21B29/06|
|Cooperative Classification||E21B29/06, E21B7/061|
|European Classification||E21B29/06, E21B7/06B|
|Jan 21, 1986||AS||Assignment|
Owner name: AMOCO CORPORATION
Free format text: CHANGE OF NAME;ASSIGNOR:STANDARD OIL COMPANY;REEL/FRAME:004558/0872
Effective date: 19850423
Owner name: AMOCO CORPORATION,ILLINOIS