Study On The Directional Drilling To Water Resource And Hydropower Investigation

In well drilling, to cause the drill hole according to the design path, drills reaches the predetermined goal to sneak in the method, using rock layer whip-stocking rule, or the artificial build angle, either both were used at the same time, is called the direction drilling .The use direction drilling sneaks in the bore-hole which the method is completed, is called the directional hole. Directional Drilling is a new technology. Achieving the same purpose in the construction of the prerequisite conditions, it can not only reduce the workload of drilling, save construction costs, but also can enhance the quality, shorten the construction period, and have the competitive technical and economic effects.Directional drilling technology has met production needs and has developed. With the solid mineral exploration explored into the deep crust progress, oil, natural gas, geothermal and groundwater resources exploration and exploitation grown, and many construction projects of the special requirements of the proposed, the application of directional drilling is more and more wide.Most hydropower projects can not be separated from the rivers, the mountains, and so on. Study on the directional drilling to water resources and hydropower investigation will rely on computer-controlled technology to design a curved hole in accordance with the ideas and conditions of site investigation and engineering geology staff, to investigate the river, the mountain, and other special-site engineering geological conditions. It is meaningful for hydropower projects' creating good social and economic benefits to reduce the workload and the investigation costs, and shorten the time of the investigation.In this paper the directional drilling trajectory design and the directional drilling technology are concluded by investigation and study, the track control procedures, laboratory testing, field experiments, theoretical analysis, process improvement, engineering and other research methods; analyzed and studied that how the stereographic projection is applied in the three-dimensional directional drilling profile ; the structure of positive displacement motor and construction technology; Coded a set of program for the investigation of directional drilling trajectory control.The formula of trajectory limit bending strength is concluded through the analysis of the elements of space, and the calculation of the directional drilling trajectory. The space elements of the directional drilling include points angle 9, and azimuth a, and body L, the vertical depth H and horizontal displacement S of target, the curvature K of the curve, and the angle 8 of the case of bored axis. Bored axis space location of the calculation method, the results reached by the curve method of calculation will undoubtedly be more reasonable and more accurate than that of the straight-line method . The trajectory of controlled directional drilling designed, the bending strength of the curve is an important parameter. As to Reasonable bending strength, directional whip-stocking low cost is ensured, on the other hand convenience and safety are ensured. Through analysis of Stereographic projection of the basic principles of face, the red-line projection method, Stereographic projection methods are applied to the directional drilling axis design calculations, having a range of parameters formula. By the application of Stereographic projection, the calculation will be simple and intuitive. Three-dimensional orientation in space-branch in the design, through the use of red-projection method, three-dimensional space-oriented branches to the equatorial plane projection axis, thus plane into the issue, re-use of the spherical triangle formula, to be Directional Drilling characteristics of the various parameters.The technical means of the directional drilling is summarized. The working principle of the positive displacement motor, the characteristic curve, when directional drilling the various pieces and the failure characteristics made by oblique positive displacement motor Analysis showed that positive displacement motor is drilling fluid as the driving force of a medium-end power equipment, positive displacement motor output shaft rotational speed, in theory, which does not depend on pressure drop, but decided on Q flow of liquid flowing through the screw motor section and the structural parameters. Selecting too many waves of the positive displacement motor teeth, the low-speed, high torque characteristics of the work were achieved, but efficiency was low. And low efficiency would not only make the water level of the conversion reduce horsepower and shorten the life of the screw drill.The results of the application research show that it is feasible for the directional drilling applied to the investigation of hydropower. In order to get the best profits, only when selecting the appropriate drilling tools, designing a reasonable trajectory drilling, the costs of hydropower investigation can be reduced.