Open AccessQuantitative evaluation of water injection composition in high injection-production ratio blocks - Taking Chao 5 well block as an example
Author(s) -
Guozhong Zhao,
Hongwei Wang,
Min Jing,
Xinbao Zheng,
FU Zhi-guo
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/781/2/022043
Subject(s) - water injection (oil production) , petroleum engineering , oil shale , steam injection , block (permutation group theory) , absorption of water , oil production , geology , environmental science , materials science , paleontology , geometry , mathematics , composite material
The injection-production ratio of the oilfields in the periphery of the Changyuan Placanticline is high. The cumulative injection-production ratio of the main oilfields in the Putaohua oil layer is between 1.29-2.46, and the cumulative injection-production ratio of the main oilfields in the Fuyang oil layer is between 1.98-2.65. At present, the viewpoints of high cumulative injection-production ratio and large ineffective water injection are generally concentrated on unmarked reservoir sandstone sections, water absorption by shale, overflow along faults and fracture systems, measurement errors, and pipeline leakage. In response to the above problems, this paper takes the Chao 5 well block as an example, establishes a block-wide numerical simulation model, carries out a quantitative evaluation of the water injection composition of a high injection-production ratio block, and analyzes the main controlling factors of different types of water injection. The research results show that the water absorption of the reservoirs in the North Chao 5-Chao 5 block accounts for 55%, the unmarked reservoir section absorbs 28%, and the mud shale absorbs 8%; the overflow of water drops to 12%. The research content of this article has a certain guiding significance for improving the level of oilfield water injection development and ensuring the efficient and sustainable development of oilfields.