Systems and methods for detecting drill break

Abstract

A method of determining drill break of a downhole system includes receiving downhole data associated with a downhole tool implemented in a wellbore, the downhole data including rate of penetration (ROP) data of the downhole tool. The method further includes, based on the downhole data, determining a baseline ROP. The method further includes identifying a threshold change of the ROP data from the baseline ROP, wherein the threshold change is based on a dynamic threshold. The method further includes generating an indication of the threshold change.

What is claimed is: 
     
         1 . A method of determining drill break of a downhole system, comprising:
 receiving downhole data associated with a downhole tool implemented in a wellbore, the downhole data including rate of penetration (ROP) data of the downhole tool;   based on the downhole data, determining a baseline ROP;   identifying a threshold change of the ROP data from the baseline ROP, wherein the threshold change is a based on a dynamic threshold; and   generating an indication of the threshold change.   
     
     
         2 . The method of  claim 1 , wherein identifying the threshold change of the ROP data includes determining a localized average ROP and identifying a change in the localized average ROP from the baseline ROP, wherein the localized average ROP is an average of the ROP data over a localized distance from a measurement depth of the downhole tool. 
     
     
         3 . The method of  claim 2 , wherein the localized distance is greater than 1 meter. 
     
     
         4 . The method of  claim 2 , wherein the localized distance is 5 meters. 
     
     
         5 . The method of  claim 2 , wherein the baseline ROP is an average of the ROP data over a baseline distance. 
     
     
         6 . The method of  claim 5 , wherein the baseline distance and the localized distance have the same length. 
     
     
         7 . The method of  claim 5 , wherein the baseline distance is based on an identified formation in which the downhole tool is located. 
     
     
         8 . The method of  claim 5 , wherein the baseline distance is based on identifying that the downhole system is operating in a drilling state. 
     
     
         9 . The method of  claim 2 , wherein the threshold change is a change in a ratio of the localized average ROP to the baseline ROP. 
     
     
         10 . The method of  claim 1 , wherein the dynamic threshold is based on the baseline ROP. 
     
     
         11 . The method of  claim 1 , wherein the dynamic threshold is inversely related to the baseline ROP. 
     
     
         12 . The method of  claim 1 , wherein identifying the threshold change includes identifying an increase in the ROP data from the baseline ROP indicating a softer formation. 
     
     
         13 . The method of  claim 1 , wherein the downhole data is time-series data, the method further comprising generating depth-dependent downhole data by normalizing the downhole data based on the ROP data, and wherein determining the baseline ROP and identifying the threshold change are based on the depth-dependent downhole data. 
     
     
         14 . The method of  claim 1 , wherein identifying the threshold change is based on determining that the downhole system is operating in a drilling state based on based on identifying that at least some of the downhole data is substantially constant. 
     
     
         15 . The method of  claim 14 , wherein the downhole data includes one or more of torque data, hookload data, flow rate data, or weight on bit data. 
     
     
         16 . The method of  claim 1 , further comprising automatically adjusting one or more drilling parameters based on the indication. 
     
     
         17 . The method of  claim 1 , further comprising causing one or more additional measurements to be taken based on the indication, including one or more of resistivity measurements, porosity measurements, gamma ray measurements, cuttings analysis, gas analysis. 
     
     
         18 . The method of  claim 1 , wherein threshold change is identified, and the indication is generated without using formation information. 
     
     
         19 . A system, comprising:
 at least one processor;   memory in electronic communication with the at least one processor; and   instructions stored in memory, the instructions being executable by the at least one processor to:
 receive downhole data associated with a downhole tool implemented in a wellbore, the downhole data including rate of penetration (ROP) data of the downhole tool; 
 based on the downhole data, determine a baseline ROP; 
 identify a threshold change of the ROP data from the baseline ROP, wherein the threshold change is a based on a dynamic threshold; and 
 generate an indication of the threshold change. 
   
     
     
         20 . A computer-readable storage medium including instructions that, when executed by at least one processor, cause the processor to:
 receive downhole data associated with a downhole tool implemented in a wellbore, the downhole data including rate of penetration (ROP) data of the downhole tool;   based on the downhole data, determine a baseline ROP;   identify a threshold change of the ROP data from the baseline ROP, wherein the threshold change is a based on a dynamic threshold; and   generate an indication of the threshold change.