水平井直井段压力恢复试井工艺

针对常规水平井试井工艺无法在正常生产状态下测试压力恢复曲线的问题，尝试不起出管柱在水平井直井段进行压力恢复试井。论述了垂直井筒中油气相态变化、气液界面移动等对水平井压力恢复试井的影响，提出了采用直井段二次施工法测试水平井油层中部压力的方法。水平井直井段压力恢复测试前确定直井段仪器下入深度，调整下入点处液柱压力大于该处原油泡点压力。进行了大庆油田某水平井水平段与直井段压力恢复试井现场试验，分析了两次测试的水平井压力恢复曲线特征。试验结果表明:采用二次施工法的水平井直井段试井工艺消除了相态分离、气液界面移动等对压力恢复曲线形态的影响，直井段压力能够同步反映水平段油层渗流信息，其试井解释结果与水平段试井解释结果符合性较好。

Pressure buildup test technology for the vertical section of horizontal well

Conventional horizontal well test technologies cannot be used to test the pressure buildup curve in the conditions of normal production. To solve this problem, it is attempted to carry out pressure buildup test in the vertical section of horizontal well without pulling the string out of the hole. The effects on the pressure buildup test of horizontal well from the phase change of oil and gas and the movement of gas-liquid contact in the vertical wellbore were discussed. Then, a method was proposed to test the pressure in the middle of the oil layer in the horizontal well by applying the secondary construction method in the vertical section. In this method, the setting depth of the instruments in the vertical section shall be determined successively and the liquid column pressure at the setting point shall be kept higher than the bubble point pressure of crude oil at this point before the pressure buildup test is carried out in the vertical section of horizontal well. Finally, pressure buildup test was carried out in the horizontal section and vertical section of one certain horizontal well in Daqing Oilfield, and the characteristics of its pressure buildup curves in both tests were analyzed. It is indicated that by virtue of the secondary construction method based well test technology for vertical section of horizontal well, the effects of phase separation and gas-liquid contact movement on the form of pressure buildup curve are eliminated, the pressure in the vertical section can synchronously reflect the seepage information of the oil layer in the horizontal section, and its test interpretation result is better accordant with that of horizontal section.