钻井泥浆漏失检测技术研究

发布时间：2018-05-26 19:18

本文选题：泥浆漏失 + 超声时差　；参考：《西安石油大学》2015年硕士论文

【摘要】：在钻井过程中,泥浆漏失时有发生。对当地环境造成很大污染,增加了钻井成本。如何快速准确找到漏失层位成为解决问题先决条件。目前在漏失层位测量方法中采用较多的有两种,一是用温度传感器监测井下不同深度处的温度变化情况另一种是采用转子流量计测流量的方法。两种测量方法都有各自的弊病。本论文在研究了目前所使用的技术手段,从而提出了以超声时差和超声多普勒两种流量测量方法互相搭配,实现泥浆测漏仪的功能。首先分析了泥浆漏失的机理。研究了超声多普勒测量与超声时差法测量原理,分析了其在泥浆测漏仪上的适用性。在理论的基础上,设计了地面测深系统,超声多普勒法与超声时差法两种测量方法搭配的井下流量测量系统。在小波检测突变点的理论基础上,利用VC++开发了相应的应用程序。最后在实验室进行了室内模拟测试。分别对深度计量及时差与多普勒流量测量性能进行了测试,测试结果表明该系统能对深度及流量进行准确的测量。进而表明整个系统能准确的判断泥浆漏失的位置。
[Abstract]:Mud leaks occur from time to time during drilling. It causes great pollution to the local environment and increases the drilling cost. How to find the missing layer quickly and accurately becomes the precondition to solve the problem. At present, there are two kinds of measuring methods of leakage horizon, one is to use temperature sensor to monitor the temperature change at different depth, the other is to use rotor Flowmeter to measure the flow rate. Both methods of measurement have their own drawbacks. In this paper, we have studied the technical means used at present, and put forward two flow measurement methods, ultrasonic time difference and ultrasonic Doppler, to realize the function of mud leak detector. Firstly, the mechanism of mud leakage is analyzed. The principle of ultrasonic Doppler measurement and ultrasonic moveout measurement is studied, and its applicability in mud leak detector is analyzed. Based on the theory, the surface sounding system, the downhole flow measurement system with ultrasonic Doppler method and ultrasonic moveout method are designed. Based on the theory of detecting mutation point by wavelet, the corresponding application program is developed by VC. Finally, laboratory simulation tests are carried out in the laboratory. The measurement performance of depth measurement, time difference and Doppler flow are tested, and the results show that the system can measure the depth and flow accurately. It shows that the whole system can accurately judge the position of mud leakage.
【学位授予单位】：西安石油大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE28

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