The Geological Research Of The Thin-poor Reservoir Of Ng5-6 In Zhongyi Area Of Gudao Oil-field And The Design Of Horizontal Well

After the exploration and exploition of nearly half a century, the main oil-reservoir of Gudao Oil-field has stepped in the period with high water cut, and their oil saturation has decreasing sharply. For make sure the stable yield of Gudao Oil-field, and there are many instructions of the exploition of thin-poor reservoirs, those thin-poor reservoirs begin to get more and more attention. This paper is written under this ground, combining with the projection, I give a geological design scheme of the horizontal wells.The design of the horizontal well is determined by the distribution of oil and gas in the reservoir, and the distribution was affected by the basic geological environment of the study area, the heterogeneity of reservoir and the physical properties of crude oil in the reservoir. So, this paper is study basic geological condition first, next, distinguish and track the thin sand body, study the characters of sedimentary facies and the distribution of the thin-poor reservoirs, after that, we analyze the heterogeneity of reservoir, and judge the distribution of oil and gas, then, combine with the 3D geological modal of the thin-poor reservoirs to give a design of horizontal well.About the design of horizontal well, it concludes the position of wellhead, the length of vertical section, the deep of KOP, the direction of horizontal section and so forth. The main work of this paper is analyzing the factor which affects those parameters, and for Ng561 thin-poor reservoir, give a reasonable projection to the W1.