Method for analysing a completion system
AssigneeWeatherford/Lamb, Inc.
InventorsAndronikos S. Demarchos, Johnny Dale Fain, Patrick Charles Hyde
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Abstract
The present invention provides a method for analysing a well completion system, wherein the method includes receiving data representative of physical characteristics of the completion system and calculating a first change in length of a tube string resulting from a helical buckling effect. The method further includes calculating a second change in length of the tube string resulting from a ballooning effect and calculating a third change in length of the tube string resulting from a slackoff force effect. Upon completion of the calculating steps, the method may output predetermined results therefrom.
Claims32
A method for analysing a well completion system, the method comprising the steps of:
- receiving input data representative of physical and environmental characteristics of the completion system;
- determining a change in length for each individual tube section of a tube string;
- determining a total change in length of the tube string through summing the change in length determined for each individual tube section of the tube string;
- and
- outputting results of the determining step to the user.
A signal bearing medium containing a completion system analysis program, that when executed by one or more processors, performs a method for analysing a completion system comprising the steps of:
- receiving data representative of physical characteristics of the completion system;
- calculating a first change in length of a tube string resulting from a helical buckling effect;
- calculating a second change in length of the tube string resulting from a ballooning effect;
- calculating a third change in length of the tube string resulting from a slackoff force effect;
- and
- outputting predetermined results from the calculating steps.
A signal bearing medium containing a program for analysing a completion system that when executed by a processor performs a method for analysing characteristics of a completion system comprising the steps of:
- receiving input data representative of physical and environmental characteristics of the completion system;
- determining a change in length for each individual tube section of a tube string;
- determining a total change in length of the tube string through summing the change in length determined for each individual tube section of the tube string;
- and
- outputting results of the determining step to the user.
A method for analysing a string of tubulars in a wellbore, comprising:
- calculating a first change in length of a section of a tube string resulting from a helical buckling effect, wherein calculating the first change in length comprises:
- determining a location of a neutral point in a tube string section;
- and
- selecting one of a partially buckled change in length equation and a completely buckled change in length equation in accordance with the determined location of the neutral point to calculate the first change in length;
- and
- summing calculated changes in lengths for each tube string section to determine a total change in length as a result of helical buckling.
Dependencies are inferred from the claim text.