Open AccessExperimental study on asynchronous injection-production in horizontal well area of low permeability reservoir
Author(s) -
Ying He
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1549/4/042045
Subject(s) - water injection (oil production) , petroleum engineering , water cut , environmental science , oil production , injection well , permeability (electromagnetism) , water well , geology , geotechnical engineering , groundwater , chemistry , biochemistry , membrane
Since 2006, a horizontal well area of low-permeability reservoir has experienced the stages of water injection efficiency and comprehensive adjustment after water breakthrough, and the formation pressure has gradually recovered. The relation curve between water cut and recovery percent shows that the development effect of horizontal well zone is obviously better than that of vertical well zone. However, with the increase of the number of the water breakthrough horizontal wells and the adjustment times, the water injection cycle is gradually shortened and the water control cycle is extended. At the same time, the adjustable direction is reduced after water breakthrough, and the contradiction between water supply and water cut is prominent. It is very difficult to stabilize the liquid and control the water in the water cut stage of the horizontal well by conventional single water injection adjustment. Therefore, asynchronous injection-production test is carried out for horizontal wells with multi-stage and multi-direction water breakthrough. It adopts the method of “no production during injection and no injection during production”, plays the role of “dialysis production and effective displacement”, reduces the water cut of oil wells, and excavates the remaining oil between wells. Through numerical simulation and comparison of different injection and production cycle schemes, and through multiple rounds of field tests, the injection and production parameters of asynchronous injection and production tests are continuously optimized as injection 3 and production 5. After the horizontal well is opened, the liquid supply capacity of well is enhanced, the remaining oil of matrix is produced, the water cut is reduced to low water cut, and the oil is increased averagely by 222t of single well, which has achieved good results. It can provide reference basis for water flooding adjustment for the same type of reservoir in the future.