高含硫油井的酸气回注技术——以顺北井区为例

Acid Gas Injection Technologies for High-Sulfur Oil Well——A Case Study on Oil Well in Shunbei Well Area

酸气回注技术已逐渐成为一种经济、环保、高效的酸气处理方法。针对顺北井区二号联油井的高含硫工况,在评价了回注酸气组分和回注条件的基础上,制定了相应的酸气回注方案。通过案例分析,阐述了酸气回注技术中地层选择、井口压力确定、压缩机选型、材料等工艺分析方法及方案制定应用技术。分析结果表明:酸气回注技术首先要考虑回注地层和井口回注压力;回注地层的选择要综合考虑地质和非地质两个方面因素;酸气回注方案制定过程中要利用相平衡原理充分脱水,防止腐蚀和水合物的生成;压缩机的选择除了基本设计外还应防止酸气在级间冷凝以及腐蚀。最终选择奥陶系地层作为回注地层,采用源头增压,四级增压方案实现酸气同层封存。

Acid gas injection(AGI) technology has gradually become an economical, environmental friendly and efficient acid gas treatment method. For this reason, a case study of high-sulfur oil well of the Erhaolian in Shunbei well area AGI project is presented. Based on evaluation of acid gas component and reinjection condition, the principles, procedures, methods and considerations in the selection of the injection formation is revealed. The results show that the reinjection formation and required wellhead reinjection pressure should be taken into account first. Geological factors and non-geological factors are the main factors in the selection of geological reinjection formation. The principle of phase equilibrium should be utilized in the formulation of AGI technology to fully dehydrate to prevent corrosion and hydrate formation. In addition to the basic design, the selection of compressor should also prevent acid gas from condensation between stages and corrosion. Finally, ordovician formation was selected as the reinjection formation, and source boosting and four-level boosting were adopted to realize AGI.