川(渝)东北构造带钻探难点及技术对策

DIFFICULTIES AND TECHNICAL COUNTERMEASURES OF DRILLING NORTHEAST SICHUAN (CHONGQING) STRUCTURAL BELT

川 (渝 )东北探区位于大巴山前缘弧形褶皱带与川 (渝 )东北弧形褶皱带附近 ,构造应力复杂 ,地层破碎、断层裂缝发育 ,地质情况极为复杂。通过在温泉井、渡口河、黄龙场、罗家寨、金珠坪等构造已钻井分析 ,该构造带钻井事故复杂时率较高、钻井速度低 ,特别是井漏复杂时率居高不下 ,严重地影响了钻井速度和增加了钻井成本 ,针对以上钻井难点 。

The Northeast Sichuan (Chongqing) exploration region is located in the neighbourhood of Dabashan frontal arcuate fold belt and Northeast Sichuan (Chongqing) arcuate fold belt with complicated geological conditions as complex structural stresses,broken strata and developed faults and fractures,etc.Through analyzing the wells drilled in Wenquanjing,Dukouhe,Huanglongchang,Luojiazhai and Jinzhuping structures,it is thought that in this structural belt,there were a long drilling trouble treating time and low drill speed;and owing to the fact that the lost circulations occurred frequently,the drill speed raised.In light of above mentioned difficulties in drilling,some technical countermeasures and suggestions for drilling this structural belt were put forward through a deepgoing research.