Recycled Isotope Correction

Abstract

Systems and methods of the present disclosure generally relate to correcting isotope ratio calculations during wellbore operation. A method for correcting isotope ratios during a wellbore operation, comprising: receiving a flow-in fluid sample from a wellbore; receiving a flow-out fluid sample from the wellbore; passing each sample to an analytical instrument operable to determine isotopes in each fluid sample; outputting a signal intensity or signa area: assigning a depth to the signal intensity or the signal area; and determining a corrected isotope ratio by subtracting a signal for the flow-in fluid sample from a signal for the flow-out fluid sample.

1 . A method for correcting isotope ratios during a wellbore operation, comprising:
 receiving a flow-in fluid sample from a wellbore;   receiving a flow-out fluid sample from the wellbore;   passing each sample to an analytical instrument operable to determine isotopes in each fluid sample;   outputting a signal area;   assigning a depth to the signal area; and   determining a corrected isotope ratio by subtracting a signal for the flow-in fluid sample from a signal for the flow-out fluid sample.   
     
     
         2 . The method of  claim 1 , further comprising passing each sample through a sample conditioner. 
     
     
         3 . The method of  claim 1 , further comprising passing each sample through a flow and pressure controller. 
     
     
         4 . The method of  claim 1 , further comprising passing each sample through a separation device to separate species within each sample. 
     
     
         5 . The method of  claim 1 , further comprising receiving the flow-in fluid sample from a flow line of a drilling system. 
     
     
         6 . The method of  claim 1 , further comprising receiving the flow-out fluid sample from a suction line of a drilling system. 
     
     
         7 . The method of  claim 1 , further comprising passing each sample to separate analytical instruments operable to determine the isotopes in each fluid sample. 
     
     
         8 . The method of  claim 7 , further comprising implementing a correction factor to determine the corrected isotope ratio due to analytical instrument bias. 
     
     
         9 . The method of  claim 1 , further comprising continuously sampling the flow-in fluid sample. 
     
     
         10 . The method of  claim 1 , further comprising continuously sampling the flow-out fluid sample. 
     
     
         11 . A system for correcting isotope ratios during a wellbore operation, comprising:
 an analytical instrument operable to determine isotopes in a wellbore fluid;   a first fluid sampling device disposed at a flow-in location for a wellbore;   a second fluid sampling device disposed at a flow-out location for the wellbore; and   a computer operable to:
 receive a signal area from the analytical instrument; 
 assign a depth to the signal area; and 
 determine a corrected isotope ratio by subtracting a signal for a flow-in fluid sample from a signal for the flow-out fluid sample. 
   
     
     
         12 . The system of  claim 11 , further comprising a flow and pressure controller disposed upstream to the analytical instrument. 
     
     
         13 . The system of  claim 11 , further comprising a sample conditioner disposed upstream to the analytical instrument. 
     
     
         14 . The system of  claim 11 , further comprising a separation device operable to separate species within each sample. 
     
     
         15 . The system of  claim 11 , further comprising a second analytical instrument operable to determine the isotopes in the wellbore fluid. 
     
     
         16 . The system of  claim 15 , wherein the computer is further operable to implement a correction factor to determine the corrected isotope ratio due to analytical instrument bias. 
     
     
         17 . The system of  claim 11 , wherein the second sampling device is disposed at a suction line of a drilling system. 
     
     
         18 . The system of  claim 11 , wherein the first sampling device is disposed at a flow line of a drilling system. 
     
     
         19 . The system of  claim 11 , wherein the first sampling device is operable to continuously sample the wellbore fluid. 
     
     
         20 . The system of  claim 11 , wherein the second sampling device is operable to continuously sample the wellbore fluid.