Source: https://patents.google.com/patent/US9650835B2/en
Timestamp: 2018-12-12 10:49:04
Document Index: 779639443

Matched Legal Cases: ['Application No. 2011326406', 'Application No. 2011326415', 'Application No. 2011326492', 'Application No. 2', 'Application No. 2', 'Application No. 2']

US9650835B2 - System and method of configuring drilling tools utilizing a critical depth of cut control curve - Google Patents
US9650835B2
US9650835B2 US13892016 US201313892016A US9650835B2 US 9650835 B2 US9650835 B2 US 9650835B2 US 13892016 US13892016 US 13892016 US 201313892016 A US201313892016 A US 201313892016A US 9650835 B2 US9650835 B2 US 9650835B2
US20130253836A1 (en )
This application is a Continuation of U.S. National patent application Ser. No. 13/884,523 filed May 9, 2013, which claims priority to International Application No. PCT/US2011/060173 filed Nov. 10, 2011, which designates the United States and claims the benefit of U.S. Provisional Patent Application Ser. No. 61/412,173 filed Nov. 10, 2010 and U.S. Provisional Patent Application Ser. No. 61/416,160 filed Nov. 22, 2010, which are incorporated herein by reference in their entirety.
A wellbore 114 may be defined in part by a casing string 110 that may extend from well surface 106 to a selected downhole location. Portions of a wellbore 114, as shown in FIG. 1, that do not include casing string 110 may be described as “open hole.” Various types of drilling fluid may be pumped from well surface 106 through drill string 103 to attached drill bit 101. Such drilling fluids may be directed to flow from drill string 103 to respective nozzles (not expressly shown) included in rotary drill bit 100. The drilling fluid may be circulated back to well surface 106 through an annulus 108 defined in part by outside diameter 112 of drill string 103 and inside diameter 118 of wellbore 114 a. Inside diameter 118 may be referred to as the “sidewall” of wellbore 114 a. Annulus 108 may also be defined by outside diameter 112 of drill string 103 and inside diameter 111 of casing string 110.
At step 2110, the engineering tool may select a control point Pi and may calculate a depth of cut for each cutlet Cj as controlled by the selected control point Pi (ΔCj), as described above with respect to FIGS. 20A and 20B. For example, the engineering tool may determine the depth of cut of cutlets 2030 a, 2030 b, 2030 c, and 2030 f as controlled by control point P2002b (Δ2030a, Δ2030b, Δ2030c, and Δ2030f, respectively) by using the following equations:
Δpi=max{ΔΔCj}.
1. A method of designing a drill bit, comprising:
selecting a radial swath associated with a bit face of a drill bit, the radial swath having an area on the bit face located between a first radial coordinate and a second radial coordinate;
identifying a blade surface of a blade associated with the bit face and configured to control a depth of cut of the portions of the plurality of cutting elements located within the radial swath;
calculating a critical depth of cut associated with the radial swath and the blade surface based on a depth of cut associated with each portion of the plurality of cutting elements located within the radial swath and controlled by the blade surface; and
adjusting a design parameter of the blade surface according to the calcuated critical depth of cut.
2. The method of claim 1, further comprising configuring the blade surface according to the calculated critical depth of cut.
8. The method of claim 6, further comprising selecting the plurality of blade points based on the plurality of blade points each being associated with a cross-sectional line that intersects the first radial swath.
11. The method of claim 1, wherein the plurality of cutting elements comprises all the cutting elements located on the bit face that each include at least a portion located within the first radial swath.
12. The method of claim 1, wherein each portion of the plurality of cutting elements includes a cutting edge of its associated cutting element, the cutting edge located within a cutting zone of the cutting element.
13. The method of claim 1, wherein the wherein the design parameter of the blade surface comprises an axial coordinate of the blade surface at a radial coordinate within the radial swath.
14. A method of designing a drill bit comprising:
calculating a critical depth of cut for each blade point by calculating a maximum value of the calculated depth of cut for each of the cutlets as controlled by the respective blade point;
calculating an overall critical depth of cut at the radial location by calculating a minimum value of the calculated critical depth of cut for each blade point; and
adjusting a drill bit design parameter in response to the overall critical depth of cut.
16. The method of claim 15, further comprising plotting the overall critical depth of cut for each of the plurality of radial locations as a function of the respective radial locations to generate the critical depth of cut control curve.
17. The method of claim 14, wherein the wherein the drill bit design parameter comprises an axial coordinate of at least one of the plurality of blade points.
US20130253836A1 true US20130253836A1 (en) 2013-09-26
US9650835B2 true US9650835B2 (en) 2017-05-16
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US20130253836A1 (en) 2013-09-26 application