利用测井资料评价钻井液漏失层

Evaluation of Mud Loss While Drilling by Using Temperature Logging and Imaging Logging Data.

川东地区的钻探中不同程度的井漏普遍存在 ,为了有效地实施堵漏作业 ,必须明确漏失井段的位置、漏失深度和漏失性质 ,即是属于重泥浆对地层的压裂造成的漏失还是属于储层低压漏失 (包括裂缝、溶洞等 )。归纳了钻井液漏失现象在测井资料上的响应特征 ,提出了通过井温测井、常规电阻率测井资料结合成像测井资料寻找出漏失层段 ,分析漏失性质的综合评价方法。通过 2口井的测井实例分析 。

Mud loss often happens while drilling in the east of Sichuan basin in recent years. In order to implement measures for plugging lost-circulation zones effectively, the lost-circulation zone′s locations, their depths and natures must be figured out definitely, i.e. which kind of situation it is, lost-circulation zone with high mud-pressure or low mud-pressure. Summarized are the characteristics of logging responds to the lost zone with drilling. Proposed is the method for searching the lost zones and analyzing their properties through temperature logging and conventional resistivity logging combined with image logging data. Two case histories are given to illustrate that logging data can be used to provide a direct and reliable materials for plugging the lost zone while drilling.