摘要
确定合理射孔施工负压差是气井射孔工程优化设计中的重要内容，其中最大无砂负压是气井射孔负压设计中较难获得的参数。它不仅直接关系到射孔后孔眼的稳定性，还与孔眼的负压清洗效果密切相连，直接影响到射孔气井的产能。文章在大量文献调研的基础上，建立了求解最大无砂负压差的弹塑性力学与渗流力学的耦合模型，从而提出了确定气井射孔完井最大无砂负压差的新方法。该方法同时考虑了气体流动的非达西效应、岩石力学性质、流体特性、射孔弹类型对最大无砂负压计算的影响，考虑因素较全面，具有通用性，优于目前采用的经验设计方法。实际应用表明该方法结果可靠。
To determine a reasonable underbalance difference of perforating job is an
important part in the optimum design of gas well perforation engineering,in which the maximum
sandfree underbalance is the parameter being difficult to obtain in underbalance design of
perforation in gas well.It is not only directly related to the stability of perforations after
perforating but also closely linked up with the underbalance cleaning result of the
perforations,by which the productivity of the perforated gas well will be directly affected.On the
basis of investigating a large number of literatures,a coupling model of the elastoplasticity and
percolation mechanics for solving the maximum sandfree underbalance difference is set
up,thus a new method for determining the maximum sandfree underbalance difference of
perforation completion of gas well is proposed in the paper.In the method,the influence of the
gas flowing's nonDarcy effect,rock mechanics property,fluid characteristic and perforating
charge type on calculating the maximum sandfree underbalance is simultaneously
considered,thus the factors involved are allsided.The method is generalservice and better than
the experiential design method used at present.Through utilizing in practice it is shown that the
result calculated by such a method is reliable.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
1999年第3期36-39,共4页
Natural Gas Industry
关键词
气井
射孔完井
负压射孔
最大负压
完井
Gas well,Perforated
completion,Underbalance perforating,Maximum,Negative pressure,Elastoplasticity,Stabilization
