保护油气层概念与技术

SOME CONCEPTS ON FORMATION PROTECTION AND THE RELATED TECHNOLOGIES

李克向

Li Kexiang

中国石油天然气集团公司, 北京 100724

钻井液密度高了,能枪毙油气层,这种认识是没有科学根据的。大量的室内和现场试验表明:造成油气层损害的主要因素有2个,一是井内液柱压力大于地层压力,二者形成的压力差较大;二是选择的钻井液类型与油气层不配伍。文中从理论和实践上说明了油气层损害的因素,及如何保护好油气层,以加快新区勘探速度。

This paper points out that the traditional concept on formation damage, that the reservoir is "killed" by drilling fluid of high density is false and lack of scientific foundation. A large amount of laboratory and field tests show that there are 2 major causes of formation damage. One is the great differential between higher hydraulic pressure in the well and the lower formation pressure; the other is the incompatibility between drilling fluid type and formation rock. The causes are further studied from the theoretical and practical aspects, and the related technologies for formation protection are also described.

10.3969/j.issn.1000-7393.2000.05.001