水平井油管传输标记物分段找水技术

Segmented Water Location Technology via Conveyed Tubing Marker for Horizontal Wells

针对目前水平井找水作业的需求和技术难点,利用稀土元素的丰度和元素间γ峰值的干扰等性能特点,选取由中子照射产生的5种自然界中不存在的同位素标记物,通过冶金工艺将其制备成具有一定孔隙度的固态标记物,并将其放置在具有限压打开结构的释放装置中,通过油管输送至水平井内的不同井段,测试产出流体中不同同位素标记物的信号强度,根据测试数据确定出水位置,形成了水平井油管传输标记物分段找水技术.该技术在大港油田3口水平井进行了现场试验,找水准确率达100%.研究和现场试验表明,水平井油管传输标记物分段找水技术克服了常规水平井找水技术存在的缺陷,找水管柱可以下入井眼轨迹复杂的水平井段,在正常生产状况下对机械采油井实施测试找水,找水准确率高,为水平井分段找水提供了新的技术手段.

In view of the existing demands and technical difficulties of pinpointing the location of in horizontal wells a new technology was proposed.This new technology uses the properties such as rare earth element abundance and inter-elementγpeak interference.In this case,five neutron irradiation-generated isotopic markers that would not present naturally were selected,and a metallurgical process was utilized to form the solid marker with a certain porosity.Such marker was placed in a release device with the pressure-limiting open mechanism and conveyed to a horizontal well by tubing.By distributing the marker in different well sections,they were able to test the signal strength of different isotope markers in the produced fluid and determined the water producing location by analyzing the test data.The segmented water location technology by tubing conveyed marker for horizontal well was field tested in three horizontal wells,and the accuracy of water location reached 100%,which provided a reference for water shut-off and water plugging.Research and field tests showed that this technology overcame the shortcomings of existing water location technologies for horizontal wells,the water location string could be run in horizontal wells with complicated wellbore trajectories,.They were able to successfully complete the test and determine the water location in mechanically produced wells under production conditions.This technology had high accuracy of water location and could provide new technical means for accurate segmented water location in horizontal wells.