Design Theory Research And Development Of Continuous Deflecting Wire-line Coring Tool

The purpose of geological exploration is to acquire mineral shape, occurrence, cover depth, reserves and host rocks property through the sample of rock and water. In order to achieve different purposes, some adopts vertical hole, and the others adopts controllable directional hole are better. However, in the domestic geological drilling industry, it only use full-scale drilling or special bit to acquire small size core due to lack of specific drilling tool for the build-rate part of direction hole. The thesis choose"analysis of design theory research and manufacture of continuous deflecting wire-line coring tools assembly"has strong innovative and value.Firstly, the thesis is based on the research of many scholars, the author choose beam theory to analyze down-hole mechanics of continuous deflecting wire-line coring tool, and introduced 2 methods to forecast deflecting ability of this tool assembly. In the field test of drilling tool, the results show the feasibility of calculating deflecting rate.Secondly, in the whole design of continuous deflecting wire-line coring tool assembly, the author confirmed the defecting ability of this drilling tool is not over 0.5°/m, the total length of drilling tool is 4-6m. And the whole drilling includes 4 parts: wire-line coring system, continuous deflecting system, opening and locking system, down-hole measurement system. In the following chapters, the author further analyzed the key technology problems ,such as the feasibility of using wire-line coring in deflecting hole,the methods to improve the recovery of coring rate and the construction of continuous deflecting system. The author fist confirms the possibility of continuous deflecting set design in small ring space in China, and raised an innovative thin eccentric set. When the eccentric value is 1.5mm, it satisfied the deflecting requirements for this tool. In order to guarantee the reliability of build rate, the author suggest use rubber tube as locking set, it is also the first time in geological drilling industry of China.Thirdly, There are two types of the deflecting set: with locking block and without locking block. The experiment shows that pressure in tool is not less than 5MPa, if we want to cut hole wall effectively. So, it is concluded that single-locking-block set can not be chose in design. The field test proved the continuous deflecting wire-line coring tool with reasonable construction,easy operation and credible performance. The maximum deflecting rate can be changed by different eccentric house. According to the design of drilling hole, the deflecting rate can be chose between 0 to maximum.