关键词: 苏里格气田, 砂体, 精细描述, 水平井, 优化部署, 地质导向

Abstract: Development technology of horizontal well has unique advantages to improve single-well production of low-permeability gas reservoir and improve overall economic performance of gas fields. Detailed sand body description and reservoir assessment are used as important means to optimize and select favorable target zones for horizontal welldevelopment.Aiming atthedevelopmentcharacteristicsofUpperand LowerPaleozoicreservoirsinthesouthern part of the eastern block of Sulige Gas Field, the efforts were focused to optimize and deploy horizontal wells on the basis of overall development including a large cluster of horizontal wells. Horizontal well can be designed according to the development characteristics of different sand bodies and efficient sand bodies. Three trajectories of horizontal sections can be adopted --- straight horizontal, from-top-to-bottom horizontal and gradient horizontal. Geological steering should be aimed at improving the drilling success rate of reservoir. Adjustment should be focused on tracing of target and tracing of horizontal section, thus developing a series of horizontal well geological steering tracing technologies, including four technologies for adjustment of target point and six technologies of trajectory control technologies. The study has achieved good results when used for horizontal well development. Two wells produced 1 million cubic meters of gas each while the effective drilling success rate of reservoir was improved 91.6 percent.

Key words: Sulige Gas Field, sand body, detailed description, horizontal well, optimization and deployment, geological steering