姬塬油田长8层高压欠注井酸化增注技术研究

Technical Study on Acidification and Augmentation in High Pressure under Injection Well in Chang 8 Reservoir of Jiyuan Oilfield

摘要: 姬塬油田长8层由于注水井储层物性较差，结垢较严重，孔喉堵塞，前期储层改造污染，造成注水井高压欠注。研究注水井的解堵深穿透缓速酸DSP-106体系，该酸液体系溶蚀能力能达到氟硼酸、氢氟酸的溶蚀能力，具有较好的缓蚀性能，有效地改善了岩心的渗透率，且没有出现岩心破损、岩屑脱落现象，不会破坏岩石骨架。2016年4月在池2X井实施降压增注工艺，日增注11 m³，注水压力下降2.9 MPa，视吸水指数平均提高3.17倍，降压增注效果明显，酸化后完全达到配注要求。

Abstract: Due to poor reservoir physical property, serious scaling, blockage of pore throat, pollution occurring in reservoir reconstruction at the early stage, under injection was induced in Chang 8 Reservoir of Jiyuan Oilfield. A retarding acid DSP-106 system for block removal and deep penetration in water injection wells was researched, the corrosion ability of the system could reach the corrosion ability for fluorine boric acid and hydrogen fluoride acid, by which the core permeability was effectively improved without core damage and rock cuttings fall off , the rock skeleton would not be destroyed. In April 2016, the technology of pressure reduction and augmentation is used in Well C2X, daily augmentation is 11 m³, water injection pressure reduction is 2.9 MPa, the apparent water absorption index increases by 3.17 times, the operation effect is obvious, and it can fully meet the requirements of allocation of water injection after acidification.