修正等时试井的合理设计

修正等时试井作为适合低渗透气藏气井产能试井的方法 ,在国外气田得到广泛应用。本文在理论研究和长庆气田气井修正等时试井经验总结的基础上 ,对影响修正等时试井结果的等时间隔、产量序列和延续生产时间等环节进行了较系统的研究 ,进而提出修正等时试井的合理设计方法 ,即等时间隔生产时间应略大于井筒储集效应时间、产量序列必须采用递增的方式、延续生产时间必须持续到拟稳态开始时间等 ,从而使修正等时试井设计更科学 ,实施更有效 ,结果更可靠

The Reasonable Design of Modified Isochronal Test.

As a method applicable to productivity well testing of gas wells in low pemeability gas reservoirs,the modified isochronal test has been widely used in oversea gasfields.On the basis of theoretical research and summary of modified isochronal test experiences on Changqing gas wells,thes paper systematically studies isochronal time interval,production rate sequence and lastingproduction time which would impact on the results of modified isochronal test,and furthemore advances the reasonable designapproach for modified isochronal test,i.e.the isochronal production time should be a little longer than the time of wellbore storage effect;production rate sequence must adopt the way of progressive increment;lasting production time must last until the start of pseudosteady state,as a result,it makes the modified isochronal test more scientific for its design,more effective for its practice and more reliable for its results.