期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2020
卷号：474
期号：5
页码：1-11
DOI：10.1088/1755-1315/474/5/052065
语种：English
出版社：IOP Publishing
摘要：Baikouquan formation of Triassic in the northwest margin of Junggar Basin has long been regarded as the synonym of "alluvial fan, ultra-low permeability and no benefit". Moreover, the effect of Triassic conglomerate reservoir reconstruction in Mabei oilfield is not obvious, which leads to ineffective production and benefit development. In this paper, based on the research results and practical production application of Triassic conglomerate reservoir fracturing reconstruction technology in Junggar Basin in recent years, four kinds of adaptive reservoir reconstruction technology for low permeability conglomerate reservoir are explored, which effectively improves the single well production and realizes the increase of reserves and productivity in conglomerate reservoir exploration. (a) In view of the three reservoir conditions of multiple sets of sand layers, large vertical oil and gas display span and large difference of stress between each set of sand layer and surrounding rock, in order to ensure that multiple sets of sand layers are effectively reconstructed, the separate layer fracturing technology is implemented. Before fracturing, the process can realize circulation fluid replacement, and after fracturing, it can realize combined production; (b) For the reservoir with poor physical properties and high formation pressure, which cannot realize the stratified fracturing of tubing packer, the casing bridge plug layered fracturing technology is adopted; (c) In view of the fact that the oil and gas reservoirs are mostly located in the upper part of the thick sand layer and the fractures extend downward to easily connect the water layer, the reservoir reconstruction technology of secondary sand addition is implemented; (d) In view of the poor physical properties of the reservoir, the oil and gas production after the vertical well fracturing is not high, or the initial oil and gas production is high, but the production decline is fast, unable to stabilize the production for a long time, the horizontal well multi-stage fracturing technology is implemented. The successful field application of the open hole packer ball sliding sleeve fracturing technology and the bridge plug perforation combined fracturing technology in horizontal wells is realized. The research and practical application of adaptive reservoir reconstruction technology further promote the reconstruction of Triassic low permeability conglomerate reservoir and single well production increase in Junggar Basin. It can be used for reference in other basins for low permeable conglomerate reservoir fracturing, and it presents good application value.
