1.Research Institute of Shaanxi Yanchang Petroleum(Group)Co.，Ltd.;2.Research Institute of Shaanxi Yanchang PetroleumGroupCo,Ltd,Xi'3.'4.an
In order to explore an effective water injection development method for tight sandstone reservoirs, six flat models with length, width, and height of 40cm, 40cm, and 5cm were made using Chang-8 layer outcrop cores from the Ordos Basin. The effects of cyclic water injection, asynchronous injection-production in the same well of horizontal wells , and asynchronous injection and production of different wells in horizontal wells on oil and water distribution, pressure distribution, and final recovery degree were studied through plate experiments.The experimental results show that the initial water injection flow line of the periodic water injection plate advances evenly towards the production end, forming a fan-shaped water drive front, and forming a channeling flow at the fracture. The longer the water injection half cycle is, the more obvious the fracture water channeling is. Properly shortening the water injection half cycle is conducive to improving the recovery degree. The injection water of asynchronous injection and production experiment in different horizontal wells flows from the injection fracture to the adjacent production fracture of the same well and the opposite production fracture at the same time, mainly between the relative fractures; The asynchronous fracture of the horizontal well is opposite the injection and production test, and the remaining oil is concentrated in a strip near the edge of the production well and in the middle of the plate. The asynchronous fracture of the horizontal well is staggered, and the remaining oil in the injection and production test is concentrated in a broken line near the edge of the production well and in the middle of the plate. Both of them have a wide range of water drive. The staggered injection and production fractures effectively avoid premature water flooding and improve the recovery degree.
孙欣华,张鸣,党海龙,等. 鄂尔多斯盆地长8层致密砂岩平板注水实验[J]. 科学技术与工程, , ():复制