Abstract:Vertical drilling technology is commonly used in mountain tunnel investigation with complex geological structure， however， it is difficult to meet the requirements of the terrain change observation adits investigation. Taking an terrain change observation adit investigation project in Xichang as an example， a method to solve the two key problems of detailed surrounding rock classification and water inflow estimation in tunel investigation based on horizontal drilling technology is put forward. Detailed logging of the joint fissures in full-hole horizontal drilling cores and the joint fracture linear density statistics are collected. Combined with the developed orientation and space of the joint fractures in the project site area， the standard rock mass model is established. Through statistical analysis of the standard model， the conversion factor K of the one-dimensional core fracture linear density and the three-dimensional volume joint number Jv of the rock mass is finally obtained. After that， the rock mass integrity index Kv and BQ values of the tunnel surrounding rock are calculated according to the standards and specifications， and then the classification of tunnel surrounding rock can be more detailed divided. In the process of drilling， horizontal drilling can be used to accurately judge the location of tunnel water inflow and measure it， which provides accurate calculation parameters for the calculation of tunnel water inflow.

Abstract:The occurrence of well leakage in drilling engineering not only seriously affects safe， fast， and low-cost drilling， but also seriously pollutes the ore layer and affects its production. The research on methods and instruments for determining the location of leakage layers is of great significance for drilling production under complex geological conditions. This article elaborates on the composition， parameter acquisition process， processing principle， mechanical structure， and testing situation of the developed CLY-1 multi-parameter intelligent leak detector. The lower probe tube of the multi-parameter intelligent leak detection system is directly connected to the lower end of the drill pipe or steel wire rope and placed into the hole for testing. The inner probe tube in the hole performs numerical testing on four parameters such as mud flow rate， well temperature， well pressure， and natural gamma along the depth of the hole， and stores the collected data in a certain format in the memory. After the probe is removed from the well， it is connected to the ground computer system to store the collected data in memory to form a digital document， providing relevant personnel with the basis for identifying leakage and surge layers.