大庆石油地质与开发2018，Vol.37Issue(2)：62-68,7.DOI:10.19597/J.ISSN.1000-3754.201706035
超低渗透油藏菱形反九点井网合理排距
REASONABLE ROW SPACING OF THE DIAMOND INVERTED NINE-SPOT WELL PATTERN IN ULTRA-LOW PERMEABILITY OIL RESERVOIRS
摘要
Abstract
Directional fractures are often well-developed for the ultra-low permeability oil reservoirs,the diamond inverted nine-spot well pattern enlarges the well spacing in the direction of the fracture propagation,thus the water breakthrough time can be delayed in the main direction of the oil well.However,if the row spacing is unreasonable,the developed effects will be seriously influenced due to the big contrast of the achieved effects in the directions of the main and lateral oil wells.Therefore with the help of stream-tube method,on the basis of the determined water breakthrough time of the oil well with the diamond inverted nine-spot well pattern in ultra-low permeability oil reservoirs,according to the principle of the obtained maximum balance water-flooded effect when the water breakthrough time of the edge well and corner well is equal,the new method to determine the reasonable row spacing of the diamond inverted nine-spot well pattern in the ultra-low permeability oil reservoir was proposed to take the threshold pressure gradient and the strong anisotropy in ultra-low permeability oil reservoirs into consideration.And furthermore the method was applied in one of Reservoir Chang 6 in Ordos Basin.The comparison and verification of the new method calculation results and the actual development effects of the oilfield show that the new method proposed in this paper is highly reliable.The reasonable row spacing of the diamond inverted nine-spot well pattern should be 90-93 m,but the actual row spacing is 140 m,which leads to no developed effects for the oil wells because there is no way to establish the perfect displacing system.The study achievements can provide theoretical evidences for the design and adjustment of the diamond inverted nine-spot well pattern in the oil reservoirs of this pilot area and moreover the same kind of the oilfield.关键词
超低渗油藏/流管法/菱形反九点井网/见水时间/合理排距Key words
ultra-low permeability oil reservoir/stream-tube method/diamond inverted nine-spot well pattern/water breakthrough time/reasonable row spacing分类
能源科技引用本文复制引用
胡利民,程时清,唐蕾,符国辉..超低渗透油藏菱形反九点井网合理排距[J].大庆石油地质与开发,2018,37(2):62-68,7.基金项目
“十三五”国家科技重大专项“分段压裂水平井油藏工程方法研究”(2017ZX05013001-005)资助. （2017ZX05013001-005）
