土耳其贝帕扎里矿区边缘对接井施工中的问题分析与处理

Analysis and solutions for the problems in drilling of horizontal intersected well sets at the boundary of Beypazari Trona Mine in Turkey

摘要:

土耳其贝帕扎里天然碱矿是土耳其现已发现的2个天然碱矿之一，现今采矿区域到达矿区边缘，为了在规范条件下最大程度提高资源回采率，需在矿区边缘布置对接井组对矿区边缘的矿产进行水溶开采。矿区边缘地质条件复杂，多条褶皱带和断裂带位于本文研究区域。在前期钻井施工过程中，发现此区域有明显的地质异常情况，如首采层的尖灭、呈V形变化、倾角大且不规则变化等。针对贝帕扎里矿区边缘对接井组施工中出现的几个典型异常问题，采用了套管锻铣技术、方位伽马配合定向钻进及“慧磁”中靶系统、增加勘探井布井密度等技术措施，有效地解决了出现的问题。

Abstract:

Beypazari Trona Mine is one of the two trona mines discovered in Turkey. Now the solution mining area has reached the boundary of the mining area. In order to maximize the recovery of trona resources under the standard conditions, it is necessary to arrange horizontal intersected well sets at the boundary of the mining area to mine the trona out. The geological conditions at the boundary of the mining area are complex with many folding and fault zones located in the study area of this paper. In the early drilling period, it is found that there are obvious geological anomalies in this area, such as pinching out, Vshape, or irregular and high dip angles of the primary mining layer. In view of these typical abnormal problems in drilling of intersected well sets at the boundary of the mining area, several technical measures, such as the casing section milling technology, directional drilling with azimuthal gamma tools and SmartMag targethitting systems, increasing the number of the exploration wells are adopted and all the problems have been resolved efficiently through these measures.