气井井筒压力温度预测矫正算法分析

Analysis of Predict and Correction Algorithm to Well-Bore Pressure and Temperature

气井天然气水合物监测过程中,需要由井口的温度、压力和流量计算井筒的压力温度分布。但分析认为,敞开式的理论方法与现场实际相比存在较大的误差,理论预测后的矫正算法设计与分析可降低误差。在开井与关井两种生产状态井筒温度压力的理论预测方法结果的基础上,设计了两点法矫正、梯度矫正和多点矫正等3种算法。以滴西1426气井实测的井身压力温度分布为例,进行了3种算法的误差对比。结果说明,矫正算法可提高预测精度。同时,针对不同生产状态设计了矫正后数据的使用方法,提出了相应建议。

The gas hydrate gas monitoring process,needs to be calculated from the wellhead temperature,pressure and flow distribution of the wellbore pressure and temperature. However,analysts believe that open theoretical approach compared with the actual presence of large errors,the theoretical prediction after correction algorithm design and analysis to reduce errors. On the basis of open and shut two production wells state well-bore temperature and pressure on the results of the theoretical prediction methods designed two-point correction,gradient correction and multi-point correction of the three algorithms. Dixi1426 gas well to drop gas measured well-bore pressure and temperature distribution as an example of the three kinds of errors comparison algorithm,the results illustrate the correction algorithm can improve the prediction accuracy. Meanwhile,the methods using data after correction are designed to different production status,and corresponding recommendations are proposed.