CAJ | 학술논문

针对卫城油田浅层区块低温、低压、低含水率、高黏度井采用常规土酸酸化效果不佳的情况，提出了碱酸复合解堵技术。该技术借鉴综合了三元复合驱和 CO2驱的优点，采用前置驱油体系和后置酸液体系，前置驱油体系主要组分为瓜胶、交联剂、烷基苯磺酸钠、Na2CO3和 NaHCO3，利用三元复合驱驱油原理，剥离驱替黏附于岩石孔隙表面的原油，避免生成酸渣；后置酸液体系为常规土酸酸液，主要作用是除污扩孔，以及与前置驱油体系反应放出热量、CO2气体降黏、促排。室内实验和现场应用结果表明，碱酸复合解堵技术前置驱油体系能为后置酸液体系解除地层污染创造良好条件，酸碱反应生成大量的 CO2气体及放出的热量与酸液有效结合能很好解决低温、低能和低含水井的有机污染和无机污染问题。
침대위성유전천층구괴저온、저압、저함수솔、고점도정채용상규토산산화효과불가적정황，제출료감산복합해도기술。해기술차감종합료삼원복합구화 CO2구적우점，채용전치구유체계화후치산액체계，전치구유체계주요조분위과효、교련제、완기분광산납、Na2CO3화 NaHCO3，이용삼원복합구구유원리，박리구체점부우암석공극표면적원유，피면생성산사；후치산액체계위상규토산산액，주요작용시제오확공，이급여전치구유체계반응방출열량、CO2기체강점、촉배。실내실험화현장응용결과표명，감산복합해도기술전치구유체계능위후치산액체계해제지층오염창조량호조건，산감반응생성대량적 CO2기체급방출적열량여산액유효결합능흔호해결저온、저능화저함수정적유궤오염화무궤오염문제。
In view of the fact that conventional mud acid acidizing effect is not satisfactory for wells with low temperature, low pressure, low watercut and high viscosity in shallow blocks of Weicheng Oilfield, this paper presents this alkali-acid composite plug removal technology, which integrates the advantages of ASP flooding and CO2 flooding, and uses the previa flooding system and post acid system. The previa flooding system is mainly composed of guar, crosslinking agent, sodium alkyl benzene sulfonate, Na2CO3 and NaHCO3, which adopts the principle of ASP flooding, stripping and displacing the crude oil attached to the surface of rocks pore to avoid residues. The post acid system is conventional mud acid liquid, the function of which is to remove dirt, enlarge pores and also react with the previa flooding system to give off heat and CO2 to reduce viscosity and enhance emission. Its plug removal effect was studied by micro-model and physical model. The experiment and field application showed that, in the alkali-acid composite plug removal technol-ogy, the previa flooding system created favorable conditions for post acid system to remove formation pollution; the reaction between alkali and acid produced large amount of CO2 and heat, which combined with acid and effectively solved the problem of organic pollu-tion and inorganic pollution in wells of low temperature, low pressure and low watercut.