A method of performing a reaming operation at a wellsite using reamer performance metrics

Abstract

Methods of performing a reaming operation at a wellsite are disclosed. The method involves measuring surface drilling parameters (e.g., surface torque and surface weight on bit) from surface sensors positioned about a rig, measuring downhole drilling parameters (e.g., downhole weight on bit and downhole torque) from downhole sensors positioned about a downhole tool, generating weight on reamer from the measured surface weight on bit and the measured downhole weight on bit, generating frictional torque by detecting from the surface sensors when the drilling tool is in a rotating off bottom state and selecting a portion of the measured surface torque measured during the rotating off bottom state, generating torque on reamer from the frictional torque, the downhole torque parameters, and the surface torque parameters, and detecting reamer performance by monitoring changes in reamer performance metrics (e.g., reamer aggressiveness) including integrated torque on reamer with weight on reamer.

What is claimed is: 
     
         1 . A method of performing a reaming operation at a wellsite, the wellsite having a rig with a drilling tool deployed from the rig and advanced into a subterranean formation to form a wellbore, an underreamer carried by the drilling tool to expand the wellbore, the method comprising:
 measuring surface drilling parameters comprising surface torque and surface weight on bit from surface sensors positioned about the rig;   measuring downhole drilling parameters comprising downhole weight on bit and downhole torque from downhole sensors positioned about the drilling tool;   generating weight on reamer from the measured surface weight on bit and the measured downhole weight on bit;   generating frictional torque by detecting from the surface sensors when the drilling tool is in a rotating off bottom state and selecting a portion of the measured surface torque measured during the rotating off bottom state;   generating torque on reamer from the frictional torque, the downhole torque, and the surface torque; and   detecting reamer performance by monitoring changes in at least one reamer performance metric, the at least one reamer performance metric comprising an integration of the torque on reamer with the weight on reamer.   
     
     
         2 . The method of  claim 1 , wherein the generating frictional torque comprises selecting the portion of the measured surface torque for a portion of the wellbore drilled during the rotating off bottom state. 
     
     
         3 . The method of  claim 1 , wherein the generating torque on reamer comprises removing the measured downhole torque and the generated frictional torque from the measured surface torque. 
     
     
         4 . The method of  claim 1 , wherein the generating weight on reamer comprises removing the measured downhole weight on bit from the surface weight on bit. 
     
     
         5 . The method of  claim 1 , wherein the at least one reamer performance metric further comprises weight load ratio, the method further comprising generating the weight load ratio from the weight on reamer and the surface weight on bit. 
     
     
         6 . The method of  claim 1 , wherein the at least one reamer performance metric comprises generating a reamer wear factor ratio based on the weight on reamer, rate of penetration and revolutions per minute. 
     
     
         7 . The method of  claim 1 , wherein the at least one reamer performance metric comprises reamer aggressiveness. 
     
     
         8 . The method of  claim 1 , wherein the measuring drilling parameters comprises providing the drilling tool with at least one of a measurement while drilling tool, a torque sensor, a weight sensor, and a revolutions per minute sensor. 
     
     
         9 . The method of  claim 1 , wherein the measuring surface drilling parameters comprises providing the surface sensors about the rig, the sensors comprising a hook load sensor, a draw works sensor, a top drive sensor, a torque sensor, and combinations thereof. 
     
     
         10 . The method of  claim 1 , wherein the measuring surface parameters further comprises measuring velocity parameters comprising at least one of block position, bit depth, hole depth, revolutions per minute, weight load ratio, and rate of penetration. 
     
     
         11 . The method of  claim 10 , wherein the detecting reamer performance comprises detecting changes in the velocity parameters. 
     
     
         12 . A method of performing a reaming operation at a wellsite, the wellsite having a rig positioned on a subterranean formation and a drilling tool deployed from the rig, the method comprising:
 advancing the drilling tool into the subterranean formation to form a wellbore and reaming the wellbore with an underreamer carried by the drilling tool;   measuring surface drilling parameters comprising surface torque and surface weight on bit from surface sensors positioned about the rig;   measuring downhole drilling parameters comprising downhole weight on bit and downhole torque from downhole sensors positioned about the drilling tool;   generating weight on reamer from the measured surface weight on bit and the measured downhole weight on bit;   generating frictional torque by detecting from the surface sensors when the drilling tool is in a rotating off bottom state and selecting a portion of the measured surface torque measured during the rotating off bottom state;   generating torque on reamer from the frictional torque, the downhole torque, and the surface torque;   detecting reamer performance by monitoring changes in at least one reamer performance metric, the at least one reamer performance metric comprising an integration of the torque on reamer with the weight on reamer; and   adjusting drilling at the wellsite based on the underreamer performance metrics.   
     
     
         13 . The method of  claim 12 , further comprising communicating the downhole drilling parameters and the surface drilling parameters to a central unit. 
     
     
         14 . The method of  claim 13 , further comprising processing the measured surface and downhole parameters, the processing comprising at least one of filtering, coding, translating, and combinations thereof. 
     
     
         15 . A method of performing a reaming operation at a wellsite, the wellsite having a rig with a drilling tool deployed from the rig and advanced into a subterranean formation to form a wellbore, an underreamer carried by the drilling tool to expand the wellbore, the method comprising:
 generating surface torque parameters from surface torque measured by surface sensors at the rig and downhole torque parameters measured by downhole sensors in the drilling tool;   generating weight on reamer from surface weight on bit measured by the surface sensors at the rig and downhole weight on bit measured by the downhole sensors in the drilling tool;   generating frictional torque by detecting when the drilling tool is in a rotating off bottom state and selecting a portion of the measured surface torque measured during the rotating off bottom state;   generating torque on reamer from the frictional torque, the downhole torque, and the surface torque; and   detecting reamer performance by monitoring changes in at least one reamer performance metric, the at least one reamer performance metric comprising an integration of the torque on reamer with the weight on reamer.   
     
     
         16 . The method of  claim 15 , further comprising communicating the reamer performance metrics to the wellsite.