Source: https://patents.google.com/patent/US6024169?oq=1886562
Timestamp: 2018-04-23 02:59:18
Document Index: 278698852

Matched Legal Cases: ['art 930', '§102', '§102', '§103', '§103', '§112']

US6024169A - Method for window formation in wellbore tubulars - Google Patents
Method for window formation in wellbore tubulars Download PDF
US6024169A
US6024169A US08956702 US95670297A US6024169A US 6024169 A US6024169 A US 6024169A US 08956702 US08956702 US 08956702 US 95670297 A US95670297 A US 95670297A US 6024169 A US6024169 A US 6024169A
US08956702
This is a Division of U.S. applications Ser. No. 08/760,283 filed on Dec. 4, 1996 entitled "Tubular Window Formation". Now U.S. Pat. No. 5,791,417, which is a continuation of Ser. No. 08/688,301 filed on Jul. 30, 1996 entitled "Wellbore Window Formation", now U.S. Pat. No. 5,709,265, which is a Continuation-In-Part of pending U.S. application Ser. No. 08/568,878 filed on Dec. 11, 1995 entitled "Casing Window Formation" issued on Jun. 10, 1997 as U.S. Pat. No. 5,636,692, all co-owned with this application and the present invention. Said patent and applications are incorporated fully herein in their entirety for all purposes.
The practice of producing oil from multiple radially dispersed reservoirs, through a single primary wellbore has increased dramatically in recent years. To facilitate this, "kick-off" technology has been developed and continues to grow. This technology allows an operator to drill a vertical well and then continue drilling one or more angled or horizontal holes off of that well at chosen depth(s). Because the initial vertical wellbore is often cased with a string of tubular casing, a "window" must be cut in the casing before drilling the "kick-off". In certain prior art methods windows are cut using various types of milling devices and one or more "trips" of the drill string are needed. Rig time is very expensive and multiple trips take time and add to the risk that problems will occur.
Methods employing such systems for creating an opening; for subsequent milling of casing.
FIG. 8a and 8b are a cross-section views of a firing head and mill of the system of FIG. 7. FIG. 8c is a cross-section view along line 8c--8c of FIG. 8b.
FIG. 21a is a schematic side view in cross-section of a system according to the present invention. FIGS. 19b and 19c are schematic side views in cross-section showing steps in a method of use of the system of FIG. 21a. FIG. 21d shows a hardened area in the wellbore of FIG. 21a made by the system of FIG. 21a.
As shown in FIGS. 8a 8b, and 8c the firing head 300 has a body 301 with a fluid bore 302 extending therethrough from a top end 303 to a bottom end 304. The fluid line 245 is in fluid communication with the bore 302 via a port 305. The body 301 may be an integral part as shown welded at 306 to the mill 241. This firing head may be used in or with a mill or in or with a bit.
When the firing piston 330 is freed, a spring 332 urges it away from a percussion initiator 333. The percussion initiator 333 is mounted at a top end of the lower body 334. A booster detonator 335 is held in a lower end of the lower body 334 and is situated to receive the effects of the percussion initiator 333 (e.g., a known and commercially available percussion initiator with a "flyer" that is explosively directed away from the initiator upon detonation). The booster detonator 335 is interconnected with detonation cord 336. Fluid under pressure flows selectively through a port 340 from the bore 302 to a bore 341 which is in fluid communication with bores 342 through liners 343 (see FIG. 8c). Fluid from the bore 342 acts on the movable piston 325. A seal 344 seals the liner-body 301 interface. A seal 345 seals the liner-body 317 interface.
The whipstock 810 is sized and disposed so that a top end of the concave 812 abuts the top stub 806 of the casing C. The lower body 816 abuts the bottom stub 808. It is within the scope of this invention for the concave to be of sufficient length to abut both stubs. In the embodiment shown in FIG. 40C the body extension 814 is of sufficient length that the concave 812 does not contact the bottom stub 808. Also, with the body extension of such a length a mill or drill bit is deflected sufficiently that it preferably will not contact the bottom, stub 808 or parts of the whipstock within the bottom stub 808 (or will contact them only incidentally). As shown the whipstock 810 bridges the sections S from the top stub 806 to the bottom stub 808. In certain embodiments the section S is four to five feet long (up to fifty feet) and the whipstock is long enough to bridge the milled out section.
As shown in FIG. 43B the part 930 has been milled out by a mill 950 according to the present invention and the mill 950 has not milled past the cement 906. The mill 950 has an angled mill surface 952 which is substantially parallel to a formation surface 926 and a nose 954 of the mill 950 is blunt so that it does not contact the formation when the mill is in the position shown in FIG. 43B. By employing a mill with a blunt nose and inwardly tapered sides and/or inwardly tapered blades (see FIGS. 41A and 43B) (tapered inward from top to bottom), contact with the formation is reduced or avoided completely (see FIGS. 40E and 43B). Preferred methods according to this invention are useful in producing sidetracked bores at relatively abrupt angles to the axis of a main wellbore, e.g. an angle of at most about thirty degrees and as small as about one degree. By using such a taper mill milling is effected to an extent equal to the total width of the mill and no undesirable unmilled casing portion or sliver is produced.
In conclusion, therefore, it is seen that the present invention and the embodiments disclosed herein and those covered by the appended claims are well adapted to carry out the objectives and obtain the ends set forth. Certain changes can be made in the subject matter without departing from the spirit and the scope of this invention. It is realized that changes are possible within the scope of this invention and it is further intended that each element or step recited in any of the following claims is to be understood as referring to all equivalent elements or steps. The following claims are entitled to the filing date of the first parent case, Dec. 11, 1995, and are intended to cover the invention as broadly as legally possible in whatever form it may be utilized. The invention claimed herein is new and novel in accordance with 35 30 U.S.C. §102 and satisfies the conditions for patentability in §102. The invention claimed herein is not obvious in accordance with 35 U.S.C. §103 and satisfies the conditions for patentability in §103. This specification and the claims that follow are in accordance with all of the requirements of 35 U.S.C. §112.
1. A method for making a window in a selected wellbore casing member for a wellbore sidetracking operation therethrough, the wellbore extending from an earth surface down into the earth, the method comprising
installing through the wellbore a system for making the window, the system including explosive means interconnected to a location device, the explosive means for explosively forming the window in the selected wellbore casing member, the explosive means including at least one explosive charge sized and configured to create the window and to create a minimum of debris in the wellbore, and
detonating the at least one explosive charge to explosively form the window.
2. The method of claim 1 wherein the at least one explosive charge is self consuming.
3. The method of claim 1 wherein the system includes shock attenuation material on sides of the at least one explosive charge and the method further comprising
attenuating with the shock attenuation material effects of the detonation of the at least one explosive charge.
4. The method of claim 1 wherein the method is a single trip method for forming the window in a single trip into the wellbore.
5. The method of claim 4 wherein the system includes a milling apparatus interconnected with a diverter device interconnected with the at least one explosive charge for diverting milling apparatus to the window formed in the selected tubular, the method further comprising
diverting the milling apparatus against the selected wellbore casing member with the diverter device.
6. The method of claim 1 wherein the system includes a milling apparatus interconnected with a diverter device interconnected with the at least one explosive charge for diverting milling apparatus to the window formed in the selected tubular, the method further comprising
7. The method of claim 1 wherein the system includes milling apparatus interconnected with the at least one explosive charge, the method further comprising
after formation of the window, milling at the window with the milling apparatus.
8. An apparatus for making a window in a selected wellbore casing member for a wellbore sidetracking operation therethrough, the wellbore extending from an earth surface down into the earth, the apparatus comprising
a location device for locating the apparatus in the wellbore, and
explosive means interconnected with the location device, the explosive means including at least one explosive charge for making the window in the selected wellbore casing member, and the at least one explosive change sized and configured to create the window and to create a minimum of debris in the wellbore.
9. The apparatus of claim 8 wherein the at least one explosive charge is self-consuming.
10. The apparatus of claim 8 wherein the system includes shock attenuation material on sides of the at least one explosive charge and the method further comprising
11. A method for making a radial ledge in a selected casing member in a wellbore, the wellbore extending from an earth surface down into the earth, the radial ledge for facilitating initial penetration thereof by a mill milling at the radial ledge, the method comprising
installing through the wellbore an apparatus for making the radial ledge, the apparatus including a location device for locating the apparatus in the wellbore and explosive means interconnected to the location device, the explosive means for explosively forming the radial ledge in the selected wellbore casing member, the explosive means including at least one explosive charge sized and configured for forming the radial ledge and to create a minimum of debris in the wellbore, and
detonating the at least one explosive charge to explosively form the radial ledge.
12. An apparatus for making a radial ledge in a selected wellbore casing member in a wellbore, the wellbore extending from an earth surface down into the earth, the radial ledge for facilitating initial penetration thereof by a mill milling at the radial ledge, the apparatus comprising
explosive means interconnected with the location device, the explosive means including at least one explosive charge for making the radial ledge in the selected wellbore casing member, the at least one explosive charge sized and configured for forming the radial ledge and to create a minimum of debris in the wellbore.
13. The method of claim 12 wherein the at least one explosive charge is self consuming.
14. The method of claim 12 wherein the system includes shock attenuation material on sides of the at least one explosive charge and the method further comprising
15. A method for making an opening to inhibit or prevent coring of a mill milling a selected wellbore casing member in a wellbore, the wellbore extending from an earth surface down into the earth, the method comprising
installing through the wellbore an apparatus for making the opening, the apparatus including a location device for locating the apparatus in the wellbore and explosive means interconnected to the location device, the explosive means for explosively forming the opening in the selected wellbore casing member, the explosive means including at least one explosive charge, and the at least one explosive charge sized and configured to create the window and to create a minimum of debris in the wellbore, and
detonating the at least one explosive charge to explosively form the opening.
16. The method of claim 15 wherein the at least one explosive charge is self consuming.
17. The method of claim 15 wherein the system includes shock attenuation material on sides of the at least one explosive charge and the method further comprising
US08956702 1995-09-22 1997-10-24 Method for window formation in wellbore tubulars Expired - Lifetime US6024169A (en)
US08568878 US5636692A (en) 1995-12-11 1995-12-11 Casing window formation
US08688301 US5709265A (en) 1995-12-11 1996-07-30 Wellbore window formation
US08760283 US5791417A (en) 1995-09-22 1996-12-04 Tubular window formation
US08956702 US6024169A (en) 1995-12-11 1997-10-24 Method for window formation in wellbore tubulars
US08760283 Division US5791417A (en) 1995-09-22 1996-12-04 Tubular window formation
US6024169A true US6024169A (en) 2000-02-15
ID=27416063
US08760283 Expired - Lifetime US5791417A (en) 1995-09-22 1996-12-04 Tubular window formation
US08956702 Expired - Lifetime US6024169A (en) 1995-09-22 1997-10-24 Method for window formation in wellbore tubulars
US (2) US5791417A (en)
EP (2) EP0866910B1 (en)
CA (1) CA2236570C (en)
DE (2) DE69629584D1 (en)
WO (1) WO1997021903A1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HAUGEN, DAVID M.;REEL/FRAME:009148/0194