威远气田井下油套管结垢因素的探讨

Discussion on the Scaling of Downhole Tubing and casing in welyuan Gas Field

本文对威远气田震旦系气藏气井的结垢因素作了考察。分析CO_2分压、温度、卤水矿化度等对地层卤水中溶解的钙离子、碳酸氢根生成碳酸钙沉淀的影响,得到钙离子浓度与CO_2分压、温度两因素的数学模型,可用于预测威远气井油套管是否结垢。

This article inspects the scaling genesis in the gas wells of Sinian gas reservior of Weiyuan Gas Field, analyses that the effects of partial pressure of CO,. temperature and salinity of brine on the Ca^++ and HCO_3^- disolved in formation brine to form CaCO_3 precipitate. The mathematical model of Ca++ concentration versus partial pressure of CO_2 and temperature is obtained ,which may be used for forecasting that the tubings and casings in gas wells of Weiyuan Gas Field are in scaling or not.