基于静电流量计的气体钻井返出岩屑流量监测

Monitoring of Cuttings Flow Back from Gas Drilling Based on Electrostatic Flowmeter

气体钻井以其经济、环保、高效等优势已逐步成为油气勘探开发的重要手段。由于地质的复杂性,在钻井过程中容易发生井壁失稳以及井下燃爆等问题,通过井口返出岩屑可以了解井下复杂情况,防止井下事故的发生。基于静电积累原理,利用COMSOL软件建立了岩屑监测模型,模拟分析不同质量流量下静电传感器的电势分布,设计了岩屑流量测量装置,以石英砂代替岩屑,测量了输出电压与气体流量以及石英砂颗粒质量流量的关系。研究结果表明,静电传感器电势与带电颗粒质量流量具有较好的线性关系,影响静电传感器信号强度的因素主要为岩屑质量流量,两者之间具有较强的线性关系;静电传感器的信号受风速影响明显,风速越大,灵敏度越高,且线性相关性越好。该方法可为气体钻井岩屑监测提供一种新的方法,对气体钻井现场安全作用具有重要意义。

With its advantages of economy,environment protection and efficiency,natural gas drilling has gradually become an important means of gas exploration and development.Due to the quality of earth science,issues like wellbore instability and downhole explosion area unit susceptible to occur throughout the drilling process.The complicated downhole state of affairs will be celebrated through the come of rock cuttings from the wellhead to forestall the prevalence of downhole accidents.The COMSOL was used to model the rock detritus monitoring with the principle of electricity accumulation,the potential distribution of the electrostatic sensor under different mass flow rates was simulated and analyzed,a cutting flow measurement device was designed to measure the output voltage and gas flow rate and the relationship between the mass flow rate of quartz sand particles with cutting replace of the quartz sand.The results show that the electrostatic sensor potential has a good linear relationship with the mass flow of charged particles.The main factor affecting the signal strength of the electrostatic sensor is the mass flow of cuttings,and there is a strong linear relationship between the two.The signal of the electrostatic sensor is affected by the wind speed,with the higher wind speed,the signal will be a good sensitivity and linear correlation.The method can provide a new method for gas drilling cuttings monitoring,which is of great significance to the safety of gas drilling sites.