CAJ | 학술논문

含碳酸钙颗粒的甲酸盐完井液体系常在裸眼砾石填充完井过程中使用，充填过程中会在井壁上形成泥饼。为了提高产能，该泥饼需要用一种合适的清除体系去掉。无机、有机酸和泥饼反应速度过快，造成泥饼清除不完全。原酸酯能在盐水溶液中水解并形成缓释酸，但由于甲酸盐体系较高的pH值，甲酸盐溶液体系对于原酸酯来说并非合适的基液。提出一种方法来解决这个问题：向甲酸盐体系中加入 NaBr 溶液后，原酸酯体系能用于甲酸盐体系的泥饼破胶。最后提出了一种螯合剂破胶体系，能够高效清除泥饼，并且满足缓速要求。
함탄산개과립적갑산염완정액체계상재라안력석전충완정과정중사용，충전과정중회재정벽상형성니병。위료제고산능，해니병수요용일충합괄적청제체계거도。무궤、유궤산화니병반응속도과쾌，조성니병청제불완전。원산지능재염수용액중수해병형성완석산，단유우갑산염체계교고적pH치，갑산염용액체계대우원산지래설병비합괄적기액。제출일충방법래해결저개문제：향갑산염체계중가입 NaBr 용액후，원산지체계능용우갑산염체계적니병파효。최후제출료일충오합제파효체계，능구고효청제니병，병차만족완속요구。
Formate completion fluid system with calcium carbonate particles is always used in open-hole gravel packing process. The mud cake is often formed in the packing process. It is important to clear the mud cake on the wellbore for restoring the productivity. Because of excessive high reacting rate with inorganic and organic acids, the mud cake can not be cleared adequately. Ortho ester can dissolve in the brine to produce sustained-release acid. But formate brine is not suitable base fluid for the ortho ester because of its high pH value. By adding sodium bromide solution to formate system, the ortho ester can be used to clear the mud cake. Another chelating agent system which can clear the mud cake efficiently was proposed in this paper. This system can meet the requirement of sustained-release.