海上砂砾岩油藏层间与层内干扰实验研究

doi:10.13809/j.cnki.cn32-1825/te.2024.01.016

Abstract

Abstract:

The interlayer and intralayer interference, which is commonly existing in the process of oilfield development, especially for the offshore strongly heterogeneous huge thick sandstone and conglomerate reservoirs that are not completely separated vertically, is the basis and internal cause of reservoir subdivision. In practice, interference data are primarily obtained from production logging, which shows that the interference coefficient changes with the development stage and over time. Since production logging is typically a point test, it does not capture the full cycle interference coefficient, highlighting the need for laboratory studies on interlayer and intralayer interference. The theoretical study of interference coefficient involves numerous parameters and the interference coefficient changes with time. This theory can explain the phenomenon that the overall oil production capacity of multi-layer combined production wells is lower than the cumulative amount of multi-layer production, but it fails to solve the theoretical root cause of its formation. So a one-dimensional core displacement experimental device was used for the study of the interlayer and intralayer interference. The experiment shows that for the interlayer interference, the interference coefficient gradually increases with time as water cut rises, but decreases in high water cut period. This is due to the difference in the displacement pressure gradient of each core during single flooding and combined flooding. While for the intralayer interference, the interference coefficient of oil production index is large in the early stage, and gradually decreases with the increase of water cut. The essence of the interference is that the change of seepage resistance of different reservoirs with time results in the change of reservoir flow distribution.

Key words: glutenite reservoir, interlayer interference, intralayer interference, interference coefficient, core displacement experiment

CLC Number:

TE357

LUO Xianbo. Laboratory experiment on interlayer and intralayer interference in offshore sandy conglomerate reservoir[J].Petroleum Reservoir Evaluation and Development, 2024, 14(1): 117-123.

Figures/Tables 13

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岩心编号	长度/m	直径/m	干重/g	孔隙度/%	气测渗透率/10^-3μm²	液测渗透率/10^-3μm
X4	0.058 2	0.025 4	53.60	26.42	66.89	69.66
Z6	0.052 5	0.024 4	50.84	30.70	99.34	53.49
X1	0.058 2	0.025 4	53.80	21.08	45.04	47.99
X3	0.058 3	0.025 4	55.63	21.08	12.11	21.27

岩心编号	长度/m	直径/m	干重/g	孔隙度/%	气测渗透率/10^-3μm²	液测渗透率/10^-3μm²
X1	0.058 2	0.025 4	53.80	21.08	45.04	47.99
Z6	0.052 5	0.024 4	50.84	30.70	99.34	53.49
X3	0.058 3	0.025 4	55.63	21.08	12.11	21.27
Z3	0.052 4	0.024 2	52.09	26.76	40.59	37.99
3-3	0.060 5	0.025 3	67.53	20.80	9.92	4.46
4-3	0.061 3	0.025 5	64.42	25.83	15.19	8.01

Laboratory experiment on interlayer and intralayer interference in offshore sandy conglomerate reservoir

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