静压测试成果影响因素分析

Factors Affecting Static Pressure Testing

地层压力恢复曲线和静压值是静压测试的两项主要成果、良好的仪器监测灵敏度、正确的计算音速、正确的油层中深数据和进油口数据、动液面数据是获得可靠地层压力恢复曲线和静压值的前提；注水强度、地层性质、流体性质、井间干扰、井深结构状况等因素使地层压力恢复曲线各段形状出现了不同程度的上翘、下降、弯曲等现象，分析其成因可判断地层性质及井下结构状况；地层阶段存水量或注水井吸水量和油井产油量的变化，使同一口井在相邻测试时间的静压值发生大的波动；外来流体参与液面恢复，使静压值偏高，分析静压值波动原因，可以了解地层压力的变化趋势及井身结构状况。

Formation pressure build-up curves and static pressure values are the main static tesling results. Highmonitoring sensitivity of the instrumentspccurate calculatedacoustic velocity and precise reservoir and pump intakedata and producing fluid level are the prerequisites to abtaining reliablc formation fressure build-up curves andstatic pressure va1ues. Some factors, including intensity ofwater injection, formation characteristics, fluid properties,interwell interference and wellbore structure can change the forms of pressure build-up curves. The static pressure values achieved in successive testing time intervals in thesame well vary greatly as water absorbing capacity of injectors and oil offtake of producers change. Staticpressure values would be higher if there exist foreign fluids during fluid level restoration.