厚层块状砂岩油藏天然气驱提高采收率方案研究

Abstract

Abstract:

The oil layer D in block H17 is a mid-high permeability sandstone thin oil reservoir with the gas cap and the bottom-edge water. Because of the huge thickness, the water flooding is difficult to effectively supplement the energy. The water coning is serious and the recovery degree and production rate are low. In order to realize the oil/gas gravitational differentiation, the oil production stabilization and water control, the formation pressure recovery and the development effect improvement, the research and development of the natural gas injection were carried out. Meanwhile, based on the characteristics of the reservoir, and through the combination of the laboratory experiment and the numerical simulation, we systematically optimize the gas injection position, the injection-production parameters and the production methods, put forward the pressure cone by the top injection to realize the secondary accumulation, and propose the deliverability of the oil production wells recovered by bench stoping gathering with oil ring. There’s a 8.9 % increase expected in the recovery efficiency.

Key words: gas injection development, heavy massive reservoir, top gas injection, pressure cone, bench stoping

CLC Number:

TE341

Sheng Cong,Lyu Yuanyuan,Wang Lili,Zhao Fan,Dong Lina. Design of block sandstone reservoirs in natural gas drive[J].Reservoir Evaluation and Development, 2018, 8(1): 24-28.

Figures/Tables 9

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References 11

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注入气量,mol%	气油比/（m³·m^-3）	膨胀系数	体积系数（Pb）	泡点压力/ MPa	原油密度（Pb）/ （g·cm³）
0	37.17	1.000 0	1.195 4	10.00	0.789 4
10	46.26	1.003 9	1.200 1	17.66	0.786 3
15	49.20	1.007 9	1.204 8	22.06	0.783 2
20	52.52	1.022 6	1.222 4	25.59	0.772 0
25	56.28	1.042 2	1.245 9	30.14	0.757 4
30	60.57	1.059 9	1.267 0	36.28	0.744 8

驱替介质	残余油饱和度,%	等渗点含水饱和度,%	两相共渗区, %	水驱油效率, %
水	39.37	46.52	25.12	38.95
气	31.72	49.70	29.77	45.51

开发方式	采出程度, %
30°顶端注外输气	58.83
水平注外输气	46.25
30°低端注外输气	30.76

组分	井流物组成,mol%	拟组分	拟组成,mol%
CO₂	0.000	C₁-N₂	35.767
N₂	0.173	C₂-CO₂-C₃	2.855
C₁	35.594	C₄-C₇	6.183
C₂	1.912	C₈-C₁₇	25.998
C₃	0.943	C₁₈₊	29.197
iC₄	0.998	C₁₁₊性质：相对密度0.936 5 分子量356.12 g/mol
nC₄	0.496
iC₅	1.177
nC₅	0.730
C₆	0.522
C₇	2.260
C₈	1.767
C₉	1.333
C₁₀	0.452
C₁₁₊	51.643

注采比	20年采出程度,%
0.9	42.1
1.0	44.2
1.1	44.5
1.3	44.6
1.5	45.5
1.7	44.1
1.9	43.6

Design of block sandstone reservoirs in natural gas drive

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压锥时间/年	注水	注气
0	36.3	45.5
1	36.3	45.9
2	36.4	46.1
3	36.3	46.2
4	36.3	46.2
5	36.5	46.3