高产气井试井压力资料异常原因分析

一些高产气井的压力恢复试井资料存在关井后期测试压力持续下降的异常现象,利用常规试井解释方法无法处理该类压力资料。在详细讨论了引起高产量、低压差气井试井压力资料异常现象的各种因素的基础上,重点对 “水击”现象及其对压力恢复测试数据的影响进行了深入分析,提出了解决该问题的技术思路和方法,并对克拉2气藏某气井试井压力资料进行了处理,其解释结果具有较高的可信度。该项研究对特殊类型气井试井异常资料处理具有重要的参考作用。

REASON ANALYSIS ON ABNORMAL PRESSURE DATA FROM HIGH PRODUCTIVITY GAS WELL TESTING

Abnormal phenomena of pressure dropping continually in the later shut in period are existed in some pressure build up test data of high productivity gas wells, which cannot be processed by conventional well testing interpretation methods. On the basis of a detailed discussion about various factors causing abnormal pressure reference of gas well testing for high production and low pressure difference, the paper puts its focus on in depth analysis of "water hammer" phenomena and its impact on pressure build up test data, puts forward the technical ideas and methods to solve the above mentioned problems, and processes the pressure data of gas well testing in the Kela 2 reservoir, which had a relatively high credibility for interpretation results. This study is an important reference for processing the abnormal data of specific type gas well testing.