US2011083906A1PendingUtilityA1

Fixed Bladed Drill Bit Force Balanced by Blade Spacing

46
Individually held — no corporate assignee on recordPriority: Oct 14, 2009Filed: Oct 14, 2009Published: Apr 14, 2011
Est. expiryOct 14, 2029(~3.2 yrs left)· nominal 20-yr term from priority
Inventors:David R. HallCasey WebbDavido Hyer
E21B 10/42E21B 10/00
46
PatentIndex Score
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Claims

Abstract

In one aspect of the present invention a force balanced drill bit may comprise a bit body comprising a plurality of fixed blades, each blade comprising cutters defining a cutter profile. Junk slots may be disposed between the blades and define the blade boundaries. The blade boundaries may be spaced apart sufficiently to achieve force balance. In another aspect of the present invention a method of designing a downhole fixed bladed bit comprises the steps of modeling a fixed bladed bit by inputting blade and cutter parameters into a computer program, performing a force balance on the modeled fixed bladed bit, and modifying at least one blade parameter to adjust the force balance. The parameters for modeling a fixed bladed bit include cutter placement on a plurality of blades integrally formed in a bit body and a position for each blade.

Claims

exact text as granted — not AI-modified
1 . A force balanced drill bit, comprising:
 a bit body comprising a plurality of fixed blades, each blade comprising cutters defining a cutter profile; and   junk slots disposed between the blades and defining blade boundaries;   wherein the blade boundaries are spaced apart sufficiently to achieve force balance.   
     
     
         2 . The force balanced drill bit of  claim 1 , further comprising at least one nozzle disposed on the bit body and aiming into a junk slot. 
     
     
         3 . The force balanced drill bit of  claim 2 , further comprising a plurality of nozzles disposed on the bit body wherein each junk slot corresponds to an individual nozzle aiming into the junk slot. 
     
     
         4 . The force balanced drill bit of  claim 3 , wherein the blade boundaries are spaced sufficiently apart to receive the plurality of nozzles. 
     
     
         5 . The force balanced drill bit of  claim 1 , wherein the cutter profile is defined by a number of cutters, spacing of the cutters, type of cutters, back rake, and side rake. 
     
     
         6 . The force balanced drill bit of  claim 1 , wherein the cutters are evenly spaced along the cutter profile. 
     
     
         7 . The force balanced drill bit of  claim 1 , wherein the cutters comprise flat shear type cutters. 
     
     
         8 . The force balanced drill bit of  claim 1 , wherein the cutters comprise conical shaped cutters. 
     
     
         9 . The force balanced drill bit of  claim 1 , wherein the cutters comprise both flat shear type cutters and conical shaped cutters. 
     
     
         10 . The force balanced drill bit of  claim 1 , wherein the cutters comprise polycrystalline diamond. 
     
     
         11 . The force balanced drill bit of  claim 1 , wherein the blade boundaries are not evenly spaced. 
     
     
         12 . The force balanced drill bit of  claim 11 , wherein the cutter profile is such that if the blade boundaries were evenly spaced then the drill bit would no longer be force balanced. 
     
     
         13 . The force balanced drill bit of  claim 1 , wherein the bit body comprises a center axis and each of the plurality of blades is disposed around the center axis. 
     
     
         14 . The force balanced drill bit of  claim 13 , wherein blade boundaries are spaced such that the blades are within six degrees of an even spacing around the center axis. 
     
     
         15 . The force balanced drill bit of  claim 1 , wherein each blade comprises a blade profile defined by a starting position, curvature radii and/or angular length, a bit depth and a bit diameter. 
     
     
         16 . The force balanced drill bit of  claim 15 , wherein each blade comprises a similar blade profile. 
     
     
         17 . The force balanced drill bit of  claim 1 , further comprising a jack element disposed intermediate the plurality of fixed blades. 
     
     
         18 . The force balanced drill bit of  claim 17 , wherein the bit body comprises a center axis and the jack element is disposed on the center axis. 
     
     
         19 . The force balanced drill bit of  claim 18 , wherein the jack element is used in a jack steering system. 
     
     
         20 . The force balanced drill bit of  claim 18 , wherein the jack element is used in a jack hammering system.

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