Design And Analysis Of Production And Operation String Integrity For Oil And Gas Well

In this paper,to address the problem of production and operations string integrity failure that may be encountered in the wells,the theoretical model of string mechanics analysis is established by spatial geometry method,and the deformation of the column,strength check,thread sealing as well as allowable annular pressure are analyzed,and the mechanical integrity analysis models under various working conditions are also established.Considering all the factors that affect the integrity of the production and operation string in the wells,a set of risk assessment index system for production and operation string is established,and the risk evaluation model of the indexes system is established by the naive Bayesian method,which is verified by using simulation data.And this paper also forms a set of risk warning system with effective information transmission and closed loop.Through the integrity analysis of two sets of different structural strings for brine discharge by injecting gas during the construction of the salt cavern gas storage,the force and strength changes of the two casing strings under different gas injection volumes were calculated.Meanwhile,an integrity analysis design software for production and production string covering mechanical calculation,deformation analysis,strength check,seal evaluation and calculation of the allowable annulus pressure has been developed.This paper manages and analyzes the integrity of production and operation string by combining historical production and operation data with theoretical models,to reduce the risk of integrity failure of production and operation string and ensure the safety and efficiency of production and operation.