Research on Horizontal Directional Drilling Locatingtechnology Based on Seismic Interference

In recent years, with the rapid development of trenchless technology, underground horizontal directional drilling technology has been widely used in the laying, repair and replacement of various underground pipelines such as cables, pipelines and tunnels. Compared with the traditional excavation technology, it has the advantages of high efficiency, small damage, and can be used for crossing construction. And, the guiding and positioning technology is the most critical technology in horizontal directional drilling, which determines the success or failure of the entire construction. In this paper, by using the method of microseismic, we first simulate a single microseismic event to obtain the seismic record. Then, we take advantage of the solution of the eikonal equation by a finite difference method to calculate the theoretical travel time of the first arrival wave. Finally, the cross-correlation gather records and the first arrival time records are used for interferometric imaging and superposition to obtain the source location. A two-dimensional geological velocity model of a uniform medium is used to perform numerical simulation. Numerical experiments demonstrate the validity of the proposed method. Compared with the traditional methods, it has higher positioning accuracy and can achieve better control of trajectory of horizontal directional drilling.