Integrated thermal and stress analysis for a multiple tubing completion well

Abstract

A well operation simulator predicts temperature and pressure profiles of a multi-tubing completion well for well design. The simulator is comprised of modules, which when executed, determine a first set of design limits based on stress conditions arising from the temperature and pressure profiles from a multi-tubing drilling module and a multi -tubing production module for drilling and production operations. A multi-tubing multi-string module predicts the annular fluid expansion (AFE) and annular pressure buildup (APB) of the multi-tubing well from the previously calculated temperature profile, pressure profile, and stress conditions and determines a second set of design limits with the AFE/APB effects in addition to the temperature profile and pressure profile predicted from multi-tubing drilling module and multi-tubing production module. The first and second sets of design limits are depicted using one or

What is claimed is: 
     
         1 . A method comprising:
 simulating a production operation for a described well with multiple tubings to determine a production temperature profile and a production pressure profile for the described well based on a flow path of each tubing, shared annulus fluid, and tubing surface-based heating coefficient of each tubing;   for each of the multiple tubings, determining a production pressure profile and a production temperature profile based, at least in part, on the production and temperature profiles for the described well;   performing a stress simulation based on the production temperature and pressure profiles of the multiple tubings to predict stress state of the described well;   determining a first set of design limitations of the described well based on: the predicted stress state of the multiple tubings, one or more casings of the described well, or combinations thereof;   simulating a drilling operation for the described well to determine a drilling temperature profile and a drilling pressure profile for the described well;   determining a trapped annular pressure buildup property and a trapped annular fluid expansion property for each annulus in a plurality of annuli located between an inner string and one or more outer casings of the described well based on the temperature and pressure profiles; and   determining a second set of design limitations of the described well with the effects of the trapped annular pressure buildup conditions and the trapped annular fluid expansion conditions.   
     
     
         2 . The method of  claim 1 , wherein determining temperature and pressure profiles of the multiple tubings of the described well further comprises obtaining heat coefficients between each of the multiple production tubings and a tubing annular fluid. 
     
     
         3 . The method of  claim 2 , wherein determining temperature and pressure profiles of the multiple tubings of the described well further comprises obtaining heat coefficients between a casing surrounding the multiple production tubings and the tubing annular fluid. 
     
     
         4 . The method of  claim 1 , wherein simulating multi-tubing heat flow is based on heat flow associated with same or different tubing flow conditions inside the production tubings. 
     
     
         5 . The method of  claim 1 , wherein determining temperature and pressure profiles comprises determining temperature profiles of the production tubings, a casing, and fluids inside the plurality of annulus, and determining pressure profiles of the fluids inside the plurality of annulus. 
     
     
         6 . The method of  claim 1 , wherein determining the first set of design limitations at least includes determining: a safety factors plot, a safety factors value, a design limit envelope plot of one of the strings, a design limit envelope value of one of the strings, or combinations thereof 
     
     
         7 . The method of  claim 1 , wherein determining the second set of design limitations at least includes determining a design limit envelope one of the strings of the described well. 
     
     
         8 . A system comprising:
 a processor; and   a machine-readable medium having instructions stored thereon that are executable by the processor to cause the system to,   generate temperature and pressure profiles of elements of a well comprising multiple production tubings based on a set of well design parameters, wherein the instructions to generate the temperature and pressure profiles comprise instructions to simulate multi-tubing heat flow and to simulate interactions amongst at least a tubing annulus fluid shared by multiple production tubings, each of the multiple production tubings, and an inner tubular string containing the multiple production tubings within,   to determine a first set of design limitations of the well based on the temperature and pressure profiles of the elements of a well;   to determine a trapped annular pressure buildup property and a trapped annular fluid expansion property for each annulus in a plurality of annuli located between an inner string and one or more outer casings of the well based on the temperature and pressure profiles; and   to determine a second set of design limitations of the well with the effects of the trapped annular pressure buildup conditions and the trapped annular fluid expansion conditions.   
     
     
         9 . The system of  claim 8 , wherein the instructions to generate temperature and pressure profiles of the elements of the well further comprise instructions to obtain heat coefficients between each of the multiple production tubings and a tubing annular fluid. 
     
     
         10 . The system of  claim 9 , wherein the instructions to generate temperature and pressure profiles of the elements of the well further comprise instructions to obtain heat coefficients between a casing surrounding the multiple production tubings and the tubing annular fluid. 
     
     
         11 . The system of  claim 8 , wherein the instructions to simulate multi-tubing heat flow are based on heat flow associated with different tubing flow conditions inside the production tubings. 
     
     
         12 . The system of  claim 8 , wherein the instructions to determine temperature and pressure profiles comprise instructions to determine temperature profiles of the production tubings, a casing, and fluids inside the plurality of annulus, and instructions to determine pressure profiles of the fluids inside the plurality of annulus. 
     
     
         13 . The system of  claim 8 , wherein the instructions to determine the first set of design limitations at least include instructions to determine a safety factors plot, a safety factors value, a design limit envelope plot of one of the strings, a design limit envelope value of one of the strings, or combinations thereof 
     
     
         14 . The system of  claim 8 , wherein the instructions to determine the second set of design limitations at least include instructions to determine a design limit envelope plot of the well. 
     
     
         15 . A non-transitory, computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:
 generating temperature and pressure profiles of elements of a well comprising multiple production tubings based on a set of well design parameters, wherein generating the temperature and pressure profiles comprises simulating multi-tubing heat flow and simulating interactions amongst at least a tubing annulus fluid shared by multiple production tubings, each of the multiple production tubings, and an inner tubular string containing the multiple production tubings within;   determining a first set of design limitations from stress analysis of the well based on the temperature and pressure profiles of the elements of the well;   determining a trapped annular pressure buildup property and a trapped annular fluid expansion property for each annulus in a plurality of annuli located between an inner string and one or more outer casings of the well based on the temperature and pressure profiles; and   determining a second set of design limitations of the well with the effects of the trapped annular pressure buildup conditions and the trapped annular fluid expansion conditions.   
     
     
         16 . The non-transitory, computer-readable medium of  claim 15 , wherein generating temperature and pressure profiles of the elements of the well further comprises obtaining heat coefficients between each of the multiple production tubings and a tubing annular fluid. 
     
     
         17 . The non-transitory, computer-readable medium of  claim 16 , wherein generating temperature and pressure profiles of the elements of the well further comprises obtaining heat coefficients between a casing surrounding the multiple production tubings and the tubing annular fluid. 
     
     
         18 . The non-transitory, computer-readable medium of  claim 15 , wherein simulating multi-tubing heat flow is based on heat flow associated with different tubing flow conditions inside the production tubings. 
     
     
         19 . The non-transitory, computer-readable medium of  claim 15 , wherein determining temperature and pressure profiles comprises determining temperature profiles of the production tubings, a casing, and fluids inside the plurality of annulus, and determining pressure profiles of the fluids inside the plurality of annulus. 
     
     
         20 . The non-transitory, computer-readable medium of  claim 15 , wherein determining the first set of design limitations at least includes determining a safety factors plot, a safety factors value, a design limit envelope plot of one of the strings, a design limit envelope value of one of the strings, or combinations thereof.