摘要
针对钻井中出现的恶性漏失情况,根据结构流体理论与超分子化学原理,研制开发出了1种新型堵漏剂——特种凝胶。它是在大分子链上引入特种功能单体的水溶性高分子材料,在水溶液中,大分子链通过分子间相互作用自发地聚集,形成可逆的超分子结构——动态物理交联网络,该结构使其溶液具有特殊的性能特点。介绍了特种凝胶的主要性能及堵漏原理,举例介绍了其在四川、长庆及吐哈油田的应用情况。现场应用结果表明,特种凝胶对大漏、失返、返出量太小的裂缝性、孔洞性、破碎性地层,以及用桥塞堵漏、随钻堵漏等方法无法解决的漏失问题具有很好的堵漏效果,尤其对付含水层以及喷漏同层的漏失问题具有独到之处。
A novel lost circulation material:special gel, was developed for use in controlling severe mud losses. The gel, made by introducing a functional monomer onto the molecular chains of high MW polymers, is a water soluble high MW polymer. When dispersed in water, a reversible supramolecular structure developed in the dispersion, which rendered the dispersion some special characteristics. In This paper the major properties of the gel and the mechanism of controlling mud losses with this gel were introduced. Some case histories in Sichuan and Tuha oil fields were also presented. The special gel, according to field practices, was especially suitable for stopping mud losses which cannot be controlled by conventional mud loss control techniques, foe example, mud losses in fractured, porous and vugular formations with (almost) no mud return, in formations which contain water zones, and in formations where blowout and mud loss coexist.
出处
《钻井液与完井液》
CAS
北大核心
2007年第5期83-84,共2页
Drilling Fluid & Completion Fluid
关键词
特种凝胶
恶性漏失
堵漏
special gel
severe mud losses
mud loss control
