Brittle-burst strength for well system tubular integrity

Abstract

A system can receive data relating to a tubular of a well system. The system can execute a first module to determine first outputs. The system can execute a second module to determine second outputs based on the first outputs. The system can execute a third module to determine third outputs based on the first outputs. The second outputs can include a crack-initiation fracture pressure, and the third outputs can include a crack-propagation fracture pressure. The system can identify a brittle-burst strength of the tubular from among the second outputs, the third outputs, and a standard burst strength of the tubular. The system can provide the brittle-burst strength of the tubular to facilitate an adjustment to the tubular to optimize a wellbore operation associated with the well system.

What is claimed is: 
     
         1 . A system comprising:
 a processing device; and   a non-transitory computer-readable memory device that includes instructions executable by the processing device for causing the processing device to perform operations comprising:
 receiving data relating to a tubular in a well system that includes a wellbore, the data comprising characteristics of the tubular and characteristics of an environment of the well system; 
 executing a first module to determine a first set of outputs based on the data, the first set of outputs comprising pressure conditions and temperature conditions relating to the tubular; 
 executing a second module to determine a second set of outputs based on the first set of outputs, the second set of outputs comprising a crack-initiation fracture pressure of the tubular; 
 executing a third module to determine a third set of outputs based on the first set of outputs, the third set of outputs comprising a crack-propagation fracture pressure of the tubular; 
 identifying a brittle-burst strength of the tubular by comparing the second set of outputs and the third set of outputs to a burst strength of the tubular, the brittle-burst strength being the lowest value of values for the crack-initiation fracture pressure, the crack-propagation fracture pressure, and the burst strength; and 
 providing the brittle-burst strength of the tubular to facilitate an adjustment to the tubular to optimize a wellbore operation associated with the well system. 
   
     
     
         2 . The system of  claim 1 , wherein the tubular is a downhole tubular positionable downhole in the wellbore, and wherein the operation of outputting the brittle-burst strength of the tubular includes:
 generating an adjusted design of the downhole tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the wellbore, and the brittle-burst strength of the tubular; and   outputting, via a user interface, a recommendation for the adjusted design of the downhole tubular to optimize the wellbore operation.   
     
     
         3 . The system of  claim 1 , wherein the tubular is a surface tubular positionable at a surface of the wellbore, and wherein the operation of outputting the brittle-burst strength of the tubular includes:
 generating an adjusted design of the surface tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the surface of the wellbore, and the brittle-burst strength of the tubular; and   outputting, via a user interface, a recommendation for the adjusted design of the surface tubular to optimize the wellbore operation.   
     
     
         4 . The system of  claim 1 , wherein the operations further comprise determining a fracture toughness of the tubular in the environment of the well system, wherein the fracture toughness is proportional to a combination of the first set of outputs, a fracture toughness of the tubular in air, and a concentration of sour elements in the environment of the well system. 
     
     
         5 . The system of  claim 4 , wherein the operation of executing the third module comprises inputting the fracture toughness of the tubular in the environment of the well system to determine the crack-propagation fracture pressure. 
     
     
         6 . The system of  claim 1 , wherein the operation of receiving data relating to the tubular comprises:
 providing a user interface that comprises a set of input fields corresponding to the characteristics of the tubular and the characteristics of the environment of the well system; and   receiving, via user input into the user interface, the data relating to the tubular.   
     
     
         7 . The system of  claim 6 , wherein the set of input fields comprises:
 a first input field corresponding to an imperfection depth of the tubular;   a second input field corresponding to a fracture toughness of the tubular in air; and   a third input field corresponding to a crack initiation threshold of the tubular; and   
       wherein the operation of executing the second module comprises inputting the crack initiation threshold of the tubular into the second module to determine the crack-initiation fracture pressure for the tubular. 
     
     
         8 . A method comprising:
 receiving, by a computing device, data relating to a tubular in a well system that includes a wellbore, the data comprising characteristics of the tubular and characteristics of an environment of the well system;   executing, by the computing device, a first module to determine a first set of outputs based on the data, the first set of outputs comprising pressure conditions and temperature conditions relating to the tubular;   executing, by the computing device, a second module to determine a second set of outputs based on the first set of outputs, the second set of outputs comprising a crack-initiation fracture pressure of the tubular;   executing, by the computing device, a third module to determine a third set of outputs based on the first set of outputs, the third set of outputs comprising a crack-propagation fracture pressure of the tubular;   identifying, by the computing device, a brittle-burst strength of the tubular by comparing the second set of outputs and the third set of outputs to a burst strength of the tubular, the brittle-burst strength being the lowest value among value for the crack-initiation fracture pressure, the crack-propagation fracture pressure, and the burst strength; and   providing, by the computing device, the brittle-burst strength of the tubular to facilitate an adjustment to the tubular to optimize a wellbore operation associated with the well system.   
     
     
         9 . The method of  claim 8 , wherein the tubular is a downhole tubular positioned downhole in the wellbore, and wherein outputting the brittle-burst strength of the tubular includes:
 generating, by the computing device, an adjusted design of the downhole tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the wellbore, and the brittle-burst strength of the tubular; and   outputting, by the computing device and via a user interface, a recommendation for the adjusted design of the downhole tubular to optimize the wellbore operation.   
     
     
         10 . The method of  claim 8 , wherein the tubular is a surface tubular positioned at a surface of the wellbore, and wherein outputting the brittle-burst strength of the tubular includes:
 generating, by the computing device, an adjusted design of the surface tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the surface of the wellbore, and the brittle-burst strength of the tubular; and   outputting, by the computing device and via a user interface, a recommendation for the adjusted design of the surface tubular to optimize the wellbore operation.   
     
     
         11 . The method of  claim 8 , further comprising determining, by the computing device, a fracture toughness of the tubular in the environment of the well system, wherein the fracture toughness is proportional to a combination of the first set of outputs, a fracture toughness of the tubular in air, and a concentration of sour elements in the environment of the well system. 
     
     
         12 . The method of  claim 11 , wherein executing the third module comprises inputting, by the computing device, the fracture toughness of the tubular in the environment of the well system to determine the crack-propagation fracture pressure. 
     
     
         13 . The method of  claim 8 , wherein receiving data relating to the tubular comprises:
 providing, by the computing device, a user interface that comprises a set of input fields corresponding to the characteristics of the tubular and the characteristics of the environment of the well system; and   receiving, by the computing device and via user input into the user interface, the data relating to the tubular.   
     
     
         14 . The method of  claim 13 , wherein the set of input fields comprises:
 a first input field corresponding to an imperfection depth of the tubular;   a second input field corresponding to a fracture toughness of the tubular in air; and   a third input field corresponding to a crack initiation threshold of the tubular; and   
       wherein executing the second module comprises inputting, by the computing device, the crack initiation threshold of the tubular into the second module to determine the crack-initiation fracture pressure for the tubular. 
     
     
         15 . A non-transitory computer-readable medium comprising instructions that are executable by a processing device for causing the processing device to perform operations comprising:
 receiving data relating to a tubular in a well system that includes a wellbore, the data comprising characteristics of the tubular and characteristics of an environment of the well system;   executing a first module to determine a first set of outputs based on the data, the first set of outputs comprising pressure conditions and temperature conditions relating to the tubular;   executing a second module to determine a second set of outputs based on the first set of outputs, the second set of outputs comprising a crack-initiation fracture pressure of the tubular;   executing a third module to determine a third set of outputs based on the first set of outputs, the third set of outputs comprising a crack-propagation fracture pressure of the tubular;   identifying a brittle-burst strength of the tubular by comparing the second set of outputs and the third set of outputs to a burst strength of the tubular, the brittle-burst strength being the lowest value of values for the crack-initiation fracture pressure, the crack-propagation fracture pressure, and the burst strength; and   providing the brittle-burst strength of the tubular to facilitate an adjustment to the tubular to optimize a wellbore operation associated with the well system.   
     
     
         16 . The non-transitory computer-readable medium of  claim 15 , wherein the tubular is a downhole tubular positionable downhole in the wellbore, and wherein the operation of outputting the brittle-burst strength of the tubular includes:
 generating an adjusted design of the downhole tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the wellbore, and the brittle-burst strength of the tubular; and   outputting, via a user interface, a recommendation for the adjusted design of the downhole tubular to optimize the wellbore operation.   
     
     
         17 . The non-transitory computer-readable medium of  claim 15 , wherein the tubular is a surface tubular positionable at a surface of the wellbore, and wherein the operation of outputting the brittle-burst strength of the tubular includes:
 generating an adjusted design of the surface tubular based on the characteristics of the tubular, a subset of the characteristics of the environment of the well system that corresponds to an environment of the surface of the wellbore, and the brittle-burst strength of the tubular; and   outputting, via a user interface, a recommendation for the adjusted design of the surface tubular to optimize the wellbore operation.   
     
     
         18 . The non-transitory computer-readable medium of  claim 15 , wherein the operations further comprise determining a fracture toughness of the tubular in the environment of the well system, wherein the fracture toughness is proportional to a combination of the first set of outputs, a fracture toughness of the tubular in air, and a concentration of sour elements in the environment of the well system, and wherein the operation of executing the third module comprises inputting the fracture toughness of the tubular in the environment of the well system to determine the crack-propagation fracture pressure. 
     
     
         19 . The non-transitory computer-readable medium of  claim 15 , wherein the operation of receiving data relating to the tubular comprises:
 providing a user interface that comprises a set of input fields corresponding to the characteristics of the tubular and the characteristics of the environment of the well system; and   receiving, via user input into the user interface, the data relating to the tubular.   
     
     
         20 . The non-transitory computer-readable medium of  claim 19 , wherein the set of input fields comprises:
 a first input field corresponding to an imperfection depth of the tubular;   a second input field corresponding to a fracture toughness of the tubular in air; and   a third input field corresponding to a crack initiation threshold of the tubular; and   
       wherein the operation of executing the second module comprises inputting the crack initiation threshold of the tubular into the second module to determine the crack-initiation fracture pressure for the tubular.