气井井筒积液预测模型优选

Optimal Selection of Forecasting Models of Wellbore Fluid in Gas Wells

气井开采过程中,井筒中会有积液产生,若井底积液不能及时排出,就会影响气井的产量,严重时甚至会导致气井水淹停产。因此,预测井筒积液变得十分有必要。预测井筒积液的方法有很多,国内外主要通过应用气井携液临界流量来进行积液预测。目前现场主要应用Turner模型进行井筒积液的判断,但对于不同的区块有一定的局限性。在气井中液滴为扁平形的基础上,推导出了一种新的积液模型,将其与常见的几种积液模型进行对比。通过对延长部分区块的54口产水气井进行积液预测,将预测结果与井的实际积液情况进行匹配,进而进行积液预测模型的优选。经过对比分析,文中推导的新模型更符合该区气井的实际情况。

In gas well production process, wellbore fluid often appears. If the fluid can not be ejected, the gas production will be affected. As the condition is getting worse, the gas well might be shut down because of water-flooding. Therefore it is necessary to forecast the wellbore fluid in the well. While, there are many methods to forecast the wellbore fluid. For example, critical flow rate of liquid carrying in applicable gas well is widely used to forecast and evaluate the wellbore fluid phenomenon at home and abroad. At the moment, Turner model is mainly used to make judgment about the wellbore fluid in the wellbore, but it can not be suitable for every districts. On the basis of oval drop in the gas well, a new wellbore fluid forecasting model was developed, and it was compared with several common wellbore fluid forecasting models. Optimal selection of forecasting models was carried out by means of matching the actual wellbore fluid extent in field with forecasting results in 54 gas wells in Yanchang block. The results show that the new model is more suitable for the field condition.