化学驱连续监测及自动测调技术

Technology of continuous monitoring and automatic measurement and adjustment about chemical flooding

为了提高化学驱分注井注入合格率,解决现有测试技术存在的单井测调时间长、录取数据少、偶然性大等问题,开展了化学驱连续监测及自动测调技术研究。通过研制内置数据采集、执行控制、运算处理等电气系统的自动测调配注器,配合过电缆封隔器、预置钢管电缆、井口密封装置、地面控制系统等部分形成一套完整的工艺管柱,将自动测调配注器随管柱下至分注层段,经预置钢管电缆与地面控制系统进行双向交互,实时监测层段注入量、嘴前压力、嘴后压力等井下数据,并且根据预设指令自动调整层段注入量。现场试验5口井,最长运行时间超过500 d。该技术实现了井下数据连续监测以及层段注入量自动调整,使单井测调时间由2~3 d降至2 h以内,层段注入合格率始终保持在90%以上,较原有技术提高30%,提升了测调效率和注入合格率。

To improve the success rate of separate injection in chemical flooding,and solve the long period of measurement and adjustment in a single well,few recorded data,and significant occasionality of data,the technology of continuous monitoring and automatic measurement and adjustment in chemical flooding was studied.An automatic measurement and adjustment flow regulator with built-in electrical systems such as data acquisition,execution control,and arithmetic processing has been developed.The process pipe string has been formed by integrating cable packers,preset steel pipe cable,wellhead sealing device and ground control system.The automatic measurement and adjustment flow regulator is tripped with the pipe string to the injection interval,and two-way interaction with the ground control system is realized through the preset steel pipe cable.Real monitoring of the downhole data such as the layered injection volume,the pressure before the nozzle,and the pressure after the nozzle is realized,and the layered injection volume is adjusted automatically according to the preset instructions.The technology has been tested in five wells,and the maximum running period is over 500 d.This technology realizes continuous monitoring of downhole data and automatic adjustment of the layered injection volume.The time of measurement and adjustment in a single well is reduced from 2 to 3 days to less than 2 hours,and the success rate of layered injection is above 90%,which is higher than 30%in the original technology.The measurement and adjustment efficiency and success rate of separate injection have been improved.