应用不稳定试井判断井间连通性

判断井间连通性是评价气藏储量、优化布井和编制开发方案所必需的工作，但随着气田的开发，气藏压力分布不断变化，对投产区新钻井，利用原始地层压力和压力梯度判断井间连通性的方法受到一定限制。根据理论分析，对于均质气藏，受邻井生产干扰的井压力恢复导数与具有定压边界的井压力恢复导数的曲线形态相似，但前者压力恢复导数小于0.5，而后者压力恢复导数先高于0.5再减小，最后小于0.5，根据此特点，可以利用投产区新钻井的不稳定试井结果，判断井间连通性，再结合压力梯度法可研究气藏的压力系统特征。

Applying transient testing to the judgement of inter-well connectivity

It is very important to judge inter well connectivity for gas felid exploitation, before a gas field putting into production; it has broad practicability to judge inter well connectivity by reservoir pressure gradients. But along with gas field producting, gas reservoir pressure is changed, so it is limited in using originality reservoir pressure and pressure gradients to judge inter well connectivity for new wells. Moreover, test period is very long and test rate is very high by using interference test to judge inter well connectivity. Text discussed variety law of interfering well pressure build up derivative of isotropic reservoir based on theory analysis, and compared with pressure build up derivative form of supply boundary, the result of pressure build up derivative of interference test is less than 0.5, and pressure build up derivative of constant pressure boundary well is greater than 0.5 at first, then minish, finally it is less than 0.5. Based on this characteristic, inter well connectivity can be judged and gas reservoir pressure system characteristic can be studied by transient test result and pressure gradients.