埕岛油田非酸解堵技术研究及现场实践

Research on Non-Acid Blockage Removal Technology and Field Application in Chengdao Oilfield

摘要: 埕岛油田在开发过程中，部分生产井出现产液量显著下降，注水井压力持续升高，影响了油田的开发效率。分析表明，储层中的黏土矿物运移、水化膨胀以及注入水中悬浮杂质沉积是导致孔喉堵塞的主要原因。针对这一问题，结合油田的地质特点及堵塞机理，开展了室内实验，开发出一套基于中性超分子解堵技术的解堵体系。实验结果显示，该体系能显著分散储层中的蜡质、胶质沥青质，并有效降低界面张力(达到10⁻³ mN/m)。现场应用于埕岛油田12C注水井后，注水压力由9.63 MPa降至2.51 MPa，降幅达73.9%，吸水指数提升2.5倍，对应油井日累增油量达12.4吨。研究结果表明，非酸超分子解堵体系能有效缓解地层堵塞，具有显著的增产、增注效果，并在油田开发中具有广泛推广价值。

Abstract: During the development of Chengdao Oilfield, some production wells exhibited a significant decline in liquid production, while injection wells experienced continuous pressure buildup, adversely affecting the field's development efficiency. Analysis revealed that the migration of clay minerals, hydration-induced swelling, and deposition of suspended impurities in injected water were the primary causes of pore-throat blockage. To address this issue, a laboratory study was conducted based on the geological characteristics and blockage mechanisms of the oilfield, leading to the development of a novel neutral supramolecular blockage removal system. Experimental results demonstrated that this system could effectively disperse wax, colloids, and asphaltenes in the reservoir while significantly reducing interfacial tension (reaching 10⁻³ mN/m). Field application in an offshore water injection well (Well A) showed that the injection pressure decreased from 9.63 MPa to 2.51 MPa, a reduction of 73.9%, with the injectivity index increasing by 2.5 times. Correspondingly, the associated oil well achieved a cumulative daily oil production increase of 12.4 tons. The study demonstrates that the non-acid supramolecular blockage removal system can effectively mitigate formation blockages, deliver remarkable stimulation and injection enhancement effects, and holds broad potential for application in oilfield development.