1998年6月8—12日将在俄罗斯圣彼得堡召开第4届国际复杂条件钻探会议。会议将交流和讨论以下议题: 1.特别复杂的自然和组织条件下的钻探施工(包括极地和赤道、冻土带和不稳定地层、干旱和交通不便地区); June 8-12, 1998 will be held in St. Petersburg, Russia, the 4th International Conference on complex conditions drilling. The meeting will exchange and discuss the following topics: 1. Drilling construction (including polar and equatorial, tundra and unstable formations, droughts and inaccessible areas) under particularly complex natural and organizational conditions;