Duty Cycle Estimation From Bending Moment Magnitude

Abstract

A method comprising: disposing a bottom hole assembly (BHA) comprising a Rotary Steerable System (RSS) into a borehole, obtaining bending of the drill bit (BOB) data with a measurement assembly disposed on the BHA, classifying the BOB data into a neutral RSS configuration or a geostationary RSS configuration, determining t 1 based at least on a neutral RSS configuration, wherein t 1 is the total time during a neutral RSS configuration, determining t 2 based at least on a neutral RSS configuration, wherein t 2 is the total time during a geostationary RSS configuration, and determining a real time Duty Cycle based at least on t 1 and t 2 . Additionally, a bottom hole assembly (BHA) comprising a Rotary Steerable System (RSS) disposed into a borehole, and a steering control system a configured to perform the method described above.

1 . A method comprising:
 disposing a bottom hole assembly (BHA) comprising a Rotary Steerable System (RSS) into a borehole;   obtaining a bending at a drill bit (BOB) data with a measurement assembly disposed on the BHA;   classifying the BOB data into a neutral RSS configuration or a geostationary RSS configuration;   determining t 1  based at least on the neutral RSS configuration, wherein t 1  is a total time during a neutral RSS configuration;   determining t 2  based at least on the neutral RSS configuration, wherein t 2  is the total time during a geostationary RSS configuration; and   calculating a real time Duty Cycle based at least on t 1  and t 2 .   
     
     
         2 . The method of  claim 1 , further comprising generating a Duty Cycle set point based on a current steering capability and a well plan. 
     
     
         3 . The method of  claim 2 , wherein generating the Duty Cycle set point further comprises a directional driller. 
     
     
         4 . The method of  claim 2 , further comprising comparing the real time Duty Cycle with the Duty Cycle set point to form an error. 
     
     
         5 . The method of  claim 4 , further comprising forming drilling parameter command updates based at least on the error. 
     
     
         6 . The method of  claim 5 , further comprising transmitting the drilling parameter command updates to at least the RSS. 
     
     
         7 . The method of  claim 6 , further comprising updating at least the RSS with the drilling parameter command updates. 
     
     
         8 . The method of  claim 7 , wherein the drilling parameter command updates is an update to a weight on bit, rotation per minute of the BHA, or a flowrate. 
     
     
         9 . The method of  claim 1 , further comprising calculating real time Duty Cycle with at least: 
       
         
           
             
               
                 real 
                 ⁢ 
                     
                 time 
                 ⁢ 
                     
                 Duty 
                 ⁢ 
                     
                 Cycle 
               
               = 
               
                 
                   
                     t 
                     2 
                   
                   
                     
                       t 
                       1 
                     
                     + 
                     
                       t 
                       2 
                     
                   
                 
                 × 
                 100. 
               
             
           
         
       
     
     
         10 . The method of  claim 1 , further comprising obtaining Weight on Bit data or Torque on Bit data with measurement assembly disposed on the BHA. 
     
     
         11 . A system comprising:
 a bottom hole assembly (BHA) comprising a Rotary Steerable System (RSS) disposed into a borehole; and   a steering control system a configured to:
 obtain a bending of a drill bit (BOB) data with a measurement assembly disposed on the BHA; 
 classify the BOB data into a neutral RSS configuration or a geostationary RSS configuration; 
 determine t 1  based at least on the neutral RSS configuration, wherein t 1  is the total time during a neutral RSS configuration; 
 determine t 2  based at least on the neutral RSS configuration, wherein t 2  is the total time during a geostationary RSS configuration; and 
 determine a real time Duty Cycle based at least on t 1  and t 2 . 
   
     
     
         12 . The system of  claim 11 , wherein the steering control system is further configured to generate a Duty Cycle set point based on a current steering capability and a well plan. 
     
     
         13 . The system of  claim 12 , wherein generating a Duty Cycle set point further comprises a directional driller. 
     
     
         14 . The system of  claim 12 , wherein the steering control system is further configured to compare the real time Duty Cycle with the Duty Cycle set point to form an error. 
     
     
         15 . The system of  claim 14 , wherein the steering control system is further configured to form drilling parameter command updates based at least on the error. 
     
     
         16 . The system of  claim 15 , wherein the steering control system is further configured to transmit the drilling parameter command updates to at least the RSS. 
     
     
         17 . The system of  claim 16 , wherein the steering control system is further configured to update at least the RSS with the drilling parameter command updates. 
     
     
         18 . The system of  claim 17 , wherein the drilling parameter command updates is an update to a weight on bit, rotation per minute of the BHA, or a flowrate. 
     
     
         19 . The system of  claim 11 , wherein the steering control system is further configured to determine real time Duty Cycle with at least: 
       
         
           
             
               
                 real 
                 ⁢ 
                     
                 time 
                 ⁢ 
                     
                 Duty 
                 ⁢ 
                     
                 Cycle 
               
               = 
               
                 
                   
                     t 
                     2 
                   
                   
                     
                       t 
                       1 
                     
                     + 
                     
                       t 
                       2 
                     
                   
                 
                 × 
                 100. 
               
             
           
         
       
     
     
         20 . The system of  claim 11 , wherein the steering control system is further configured to obtain Weight on Bit data or Torque on Bit data with measurement assembly disposed on the BHA.