固井溢流监测系统的研究

发布时间：2018-05-23 12:32

本文选题：固井 + 注替过作业　；参考：《重庆科技学院》2015年硕士论文

【摘要】：固井作业是石油天然气钻井工程的重要组成部分，虽然固井作业周期短，但是依然存在溢流、井喷事故风险。做好对溢流的监测，实现“早发现、早关井”是做好二级井控、预防井喷失控事故的关键。通过现场调研发现固井注替作业中溢流监测存在返浆中的混浆缺少监测手段、数据采集困难等问题。通过分析固井注替过程井底压力变化，得到由于井内存在多种流体，可能导致真空段的产生，从而干扰对溢流判断。本课题在基于不改变钻井现场设备和工艺的前提下，提出固井溢流液位监测和流量监测两种方案；对于尾管固井流量监测，为了能使用电磁流量计，考虑对返浆出口导管进行满管流改造；对于液位监测方法，考虑增加储液罐，再用超声波液位计监测混浆的排量。在本课题采用SCW无线传输系统来接收监测设备的数据，，提高数据采集的实时性和准确性。本课题建立井底压力平衡模型计算分析井下是否发生真空段，以及真空段发生的时间、真空段体积以及返浆的理论排量，通过和监测数值进行对比来判断是否发生溢流。通过现场试用固井溢流监测方案，结果表明改进固井溢流监测系统能具有实际可操作性，能有效的解决固井溢流监测的难题。
[Abstract]:Cementing is an important part of oil and gas drilling engineering. Although the cementing period is short, there is still the risk of overflow and blowout accidents. Monitoring the overflow and realizing "early detection and early shutoff" are the keys to do a good job of secondary well control and prevent blowout out of control. Through field investigation, it is found that there are some problems in overflow monitoring in cementing injection replacement operation, such as the lack of monitoring means in slurry return and the difficulty of data acquisition, etc. By analyzing the change of bottom hole pressure in cementing process, it is found that there are many fluids in the well, which may lead to the production of vacuum section and interfere with the judgment of overflow. Based on the condition that the drilling equipment and technology are not changed, two schemes of cementing overflow level monitoring and flow monitoring are put forward in this paper, and for the flow monitoring of tailpipe fixed wells, in order to be able to use electromagnetic Flowmeter, For the liquid level monitoring method, consideration should be given to increasing the liquid storage tank and using the ultrasonic liquid level meter to monitor the slurry discharge. In this paper, the SCW wireless transmission system is used to receive the data of the monitoring equipment to improve the real-time and accuracy of data acquisition. In this paper, the bottom hole pressure balance model is established to calculate and analyze whether the vacuum section occurs, the time, volume and theoretical discharge of the vacuum section, and to judge whether the overflow occurs or not by comparing with the monitoring value. The results show that the improved cementing overflow monitoring system can be operated in practice and can effectively solve the problem of cementing overflow monitoring.
【学位授予单位】：重庆科技学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE256

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