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Geological Design Research on Horizontal Well in the Southcetral of Raoyang Sag

Author: YangXueSong
Tutor: LiZhiPing；DengAiJu
School: Chinese Geology University (Beijing)
Course: Geological Engineering
Keywords: Horizontal wells Remaining oil Geological design Track design
CLC: P618.13
Type: Master's thesis
Year: 2010
Downloads: 166
Quote: 0
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Abstract

Horizontal well technology is a proven, state-of-the-art technology, is generally used in a conventional technology for the world's largest oil company and an important means. Of great significance for improving individual well production, developing marginal reserves, energy saving, less well realize productive, less well efficient. In recent years, the development of oil horizontal well drilling soon, years to drill horizontal wells to reach more than 500 since 2006, which since 2008 is more than the average annual one thousand active in the research and development of horizontal wells in accordance with the unified deployment of PetroChina Huabei Oilfield . Huabei Oilfield horizontal wells are mainly used in the latter part of the remaining oil reservoir development, improve the effect of oil recovery and development, and summarizes the statistics and analysis of the effects of horizontal wells drilled since the 2006 scale application of horizontal well technology, efficient water Hirai and lessons of the defeat of horizontal wells for different types of reservoirs, in-depth analysis of the remaining oil model, targeted to carry out a pilot test in vertical wells, or the application of conventional wells Chief probe to verify the remaining oil analysis accuracy, summarized different types of reservoirs Geological design method of horizontal wells remaining oil distribution pattern, the central and southern study area is located in Raoyang Depression. Through detailed research, it is clear the different reservoirs of the Huabei Oilfield clear remaining oil distribution pattern: positive rhythm thick oil layer at the top of the remaining oil enrichment; edge water reservoir tongue between the presence of residual oil; plenty of natural energy, edge and bottom water reservoir in the oil possession after the high water content, the presence of the remaining oil in the lower portion of the original oil-water interface; presence of local high point of the high parts of the broken edges, remnants of high points, slightly structure remaining oil, fractured sandstone reservoir storms flooded after remaining oil the existence. Consider horizontal wells based on geological design: Design Considerations for the top of tapping the potential of horizontal wells in old wells, waterflood direction substantially parallel; waist remaining oil horizontal wells deployment should be above the original oil-water interface, parallel water flooding direction; creatively put forward multilayer mining fault roots, imbricate horizontal well design; tongue between the remaining oil and water the Hirai design needs drive to avoid the main water line, from high to low; the buried hills cone of high angle fractures should choose between producing flat higher parts; well spacing is too large, the water injection was not effective in low permeability reservoir, may be considered for the major reservoirs in the well network along the minimum level of stress orientation design injection wells. Horizontal well trajectory design research: Stick from high to low pro-oriented edge and bottom water reservoir delay water breakthrough time; along the minimum stress orientation designed to reduce the difficulty of drilling to ensure mine safety, at the same time the post-fracturing treatment; No well-controlled areas to have well controlled zone design trajectory as close as possible to the old well, which will help to control the occurrence of the target layer is calculated; design by hypotonic zone to hypertonic District, balanced liquid profile; consider the length of the horizontal section of the distribution of the remaining oil off block size, fault distribution, reservoir distribution of reasonably determine.

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