Given the high pressure and corrosion environment with 8%-16% of H2S content and 5%-10% of CO 2 content in the gathering line for a domestic gas field with high sulfur content, the possible corrosion factors are analyzed. And with static high temperature autoclave, the acting law of different corrosion factors, such as H 2S, CO 2, temperature, Cl, and elemental sulfur, etc, on the steel 20# is investigated. The results show the steel 20# is corroded severely in the experimental scope. The corrosion rate is at 0. 348 - 2. 559 mm/a. But the temperature, Cl content in water and elemental sulfur are the main factors of the steel 20# corrosion. The higher the Cl content is, the faster the corrosion rate is. The corrosion rate of the steel 20# is bigger relatively at 40 ̊C of temperature. The weight-loss corrosion and pitting corrosion will be speeded since the elemental sulfur existing. The maximum pitting corrosion depth is 4. 867 mm/a. Based on the in-house study, it is suggested the proper measures should be taken to remove the elemental sulfur deposited in the gathering line and keep out of temper ature about 40 ̊C for the pipeline operation to reduce the corrosion. Also, the corrosion control should be enhanced for the gathering line where the formation water with high Cl content converges.

CT降滤失酸是西南油气田分公司天然气研究院近年来研制的一种新型酸液体系。该体系以控制酸液滤失为主要特点 ,较好的解决了酸化施工时酸液的滤失。在现场施工中 ,无论是新井还是老井的重复酸化施工均取得了很好的施工效果。在已进行的 6口井施工中 ,施工有效率达 83% ,每天增加井口天然气产能近 30×10 4m3 。文章简要介绍了CT降滤失酸的性能及现场应用情况。