The grillage adaptive beam string structure(GABSS)is a new type of smart structure that can self-adjust its deformation and internal forces through a group of active struts(actuators)in response to changes in environm...The grillage adaptive beam string structure(GABSS)is a new type of smart structure that can self-adjust its deformation and internal forces through a group of active struts(actuators)in response to changes in environmental conditions.In this paper,an internal force control method based on a gradient–genetic algorithm(GGA)is proposed for the static control of a tensioned structure(especially the GABSS).Specifically,an optimization model of the GABSS is established in which the adjustment values of the actuators are set as the control variables,and the internal force of the beam is set as the objective function.The improved algorithm has the advantage of the global optimization ability of the genetic algorithm and the local search ability of the gradient algorithm.Two examples are provided to illustrate the application of the GGA method.The results show that the proposed method is practical for solving the internal force control problem of the GABSS.展开更多
For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are c...For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are caused by erosion,corrosion,thread leakage and improper well completion operations,a series of studies and field tests were mainly carried out,including optimization of well completion modes,experimental evaluation and optimization of string materials,sealing performance evaluation of string threads,structural optimization design of downhole pipe strings and erosion resistance evaluation of pipe strings,after the technical difficulties related with the well completion in this reservoir were analyzed.And consequently,a set of complete well completion technologies suitable for HTHP(high temperature and high pressure)and highflowrate gas wells with acidic media was developed as follows.First,optimize well completion modes,pipe string materials and thread types.Second,prepare optimized string structures for different production allocation conditions.And third,formulate well completion process and quality control measures for vertical and inclined wells.Field application results show that the erosion of high-flowrate production on pipe strings and downhole tools and the effect of perforation on the sealing performance of production packers were reduced effectively,well completion quality was improved,and annulus abnormal pressure during the late production was reduced.This research provides a reference for the development of similar gasfields.展开更多
基金supported by the National Key R&D Program of China(No.2017YFC0806100)the National Natural Science Foundation of China(No.51578491)。
文摘The grillage adaptive beam string structure(GABSS)is a new type of smart structure that can self-adjust its deformation and internal forces through a group of active struts(actuators)in response to changes in environmental conditions.In this paper,an internal force control method based on a gradient–genetic algorithm(GGA)is proposed for the static control of a tensioned structure(especially the GABSS).Specifically,an optimization model of the GABSS is established in which the adjustment values of the actuators are set as the control variables,and the internal force of the beam is set as the objective function.The improved algorithm has the advantage of the global optimization ability of the genetic algorithm and the local search ability of the gradient algorithm.Two examples are provided to illustrate the application of the GGA method.The results show that the proposed method is practical for solving the internal force control problem of the GABSS.
基金Project supported by the National Manjor S&T Project“Development Demonstration Project of Large Carbonate Gas Field in Longgang Area,the Sichuan Basin”(No.2011ZX05047-02)Ph.D Station S&T Research Project of PetroChina Southwest Oil and Gas Field Company“Study on String Mechanics concerning to the Integrity of HTHP High-yield Gas Wells in the Longwangmiao Fm Reservoir”(No.20140305-11).
文摘For safe and efficient development of the sour gas reservoirs of the Cambrian Longwangmiao Fm in the Anyue Gas Field,the Sichuan Basin,and reduction of safety barrier failures and annulus abnormal pressure which are caused by erosion,corrosion,thread leakage and improper well completion operations,a series of studies and field tests were mainly carried out,including optimization of well completion modes,experimental evaluation and optimization of string materials,sealing performance evaluation of string threads,structural optimization design of downhole pipe strings and erosion resistance evaluation of pipe strings,after the technical difficulties related with the well completion in this reservoir were analyzed.And consequently,a set of complete well completion technologies suitable for HTHP(high temperature and high pressure)and highflowrate gas wells with acidic media was developed as follows.First,optimize well completion modes,pipe string materials and thread types.Second,prepare optimized string structures for different production allocation conditions.And third,formulate well completion process and quality control measures for vertical and inclined wells.Field application results show that the erosion of high-flowrate production on pipe strings and downhole tools and the effect of perforation on the sealing performance of production packers were reduced effectively,well completion quality was improved,and annulus abnormal pressure during the late production was reduced.This research provides a reference for the development of similar gasfields.
