0 引言
1 苏里格致密气多层合采层物理模拟实验
1.1 实验流程、方案与岩样物性参数
表1 物理模拟实验参数Table 1 Physical simulation experiment parameters |
组合 | 储层 | 岩心编号 | 孔隙体积(V p)/cm3 | 孔隙度/% | 渗透率/(10-3 μm2) | σ | 长度(L)/cm |
---|---|---|---|---|---|---|---|
A | 气层 | 1-5 | 30 | 8.80 | 0.033 | 95.02 | 30 |
水层 | 3-6 | 63.92 | 15.94 | 3.12 | 38 | ||
B | 气层 | 1-10 | 46.21 | 14.47 | 0.16 | 1.183 | 30.2 |
水层 | 1-14 | 62.18 | 14.74 | 0.18 | 39.9 | ||
C | 气层 | 1-1 | 41.38 | 13.47 | 0.070 | 23.37 | 30.1 |
水层 | 1-7 | 59.62 | 14.16 | 1.64 | 39.7 | ||
D | 气层 | 1-2 | 51.84 | 12.31 | 1.55 | 0.039 | 39.7 |
水层 | 1-3 | 30.44 | 9.91 | 0.061 | 30.1 |
1.2 层间气、水交互越流论证及其对开发效果的影响
2 苏里格致密气合采干扰指数模型
2.1 干扰指数定义
2.2 干扰指数模式
表2 方案二干扰指数拟结果Table 2 Interference index fitting results, scheme II |
射开气、水层 | a/% | b/MPa-1 | c/MPa | S w/% | σ | K w/ (10-3 μm2) |
---|---|---|---|---|---|---|
组合A | 73.110 | 0.165 | 3.722 | 100.00 | 95.020 | 3.12 |
74.204 | 0.174 | 4.290 | 80.00 | 95.020 | 3.12 | |
64.463 | 0.217 | 4.444 | 70.00 | 95.020 | 3.12 | |
52.461 | 0.303 | 4.765 | 60.00 | 95.020 | 3.12 | |
组合C | 32.142 | 0.328 | 6.747 | 100.00 | 23.370 | 1.64 |
43.674 | 0.259 | 6.044 | 80.00 | 23.370 | 1.64 | |
27.767 | 0.361 | 7.257 | 70.00 | 23.370 | 1.64 | |
22.425 | 0.563 | 7.210 | 60.00 | 23.370 | 1.64 | |
组合B | 17.011 | 0.590 | 7.376 | 100.00 | 1.183 | 0.18 |
31.558 | 0.499 | 6.692 | 80.00 | 1.183 | 0.18 | |
21.950 | 0.459 | 7.360 | 70.00 | 1.183 | 0.18 | |
11.611 | 0.742 | 7.171 | 60.00 | 1.183 | 0.18 | |
组合D | 9.308 | 1.014 | 9.337 | 100.00 | 0.039 | 0.061 |
14.844 | 0.836 | 8.294 | 80.00 | 0.039 | 0.061 | |
12.036 | 0.845 | 8.822 | 70.00 | 0.039 | 0.061 | |
8.323 | 1.057 | 9.468 | 60.00 | 0.039 | 0.061 |
2.3 干扰指数模型
表3 方案三干扰指数拟合结果Table 3 Interference index fitting results, scheme III |
只射开气层 | a/% | b/MPa-1 | c/MPa | S w/% | σ | K w/ (10-3 μm2) |
---|---|---|---|---|---|---|
组合A | 71.140 | 0.472 | 10.862 | 100.00 | 95.020 | 3.12 |
82.207 | 0.535 | 10.765 | 80.00 | 95.020 | 3.12 | |
75.882 | 0.628 | 12.904 | 70.00 | 95.020 | 3.12 | |
65.108 | 0.657 | 12.091 | 60.00 | 95.020 | 3.12 | |
组合C | 37.249 | 0.216 | 6.846 | 100.00 | 23.370 | 1.64 |
48.647 | 0.334 | 7.987 | 80.00 | 23.370 | 1.64 | |
30.223 | 0.366 | 7.683 | 70.00 | 23.370 | 1.64 | |
26.552 | 0.476 | 7.735 | 60.00 | 23.370 | 1.64 | |
组合B | 18.355 | 0.315 | 5.793 | 100.00 | 1.183 | 0.18 |
38.648 | 0.482 | 5.541 | 80.00 | 1.183 | 0.18 | |
25.042 | 0.497 | 7.889 | 70.00 | 1.183 | 0.18 | |
13.225 | 0.649 | 7.367 | 60.00 | 1.183 | 0.18 | |
组合D | 13.306 | 0.181 | 4.053 | 100.00 | 0.039 | 0.061 |
17.263 | 0.330 | 5.161 | 80.00 | 0.039 | 0.061 | |
16.256 | 0.377 | 3.730 | 70.00 | 0.039 | 0.061 | |
10.393 | 0.385 | 4.510 | 60.00 | 0.039 | 0.061 |
3 基于干扰指数的苏里格致密气井产能评价方法
3.1 基于干扰指数的致密气井产能评价模型
3.2 干扰指数产能评价模型检验及应用
表4 两口井储层参数Table 4 Reservoir parameters of two wells |
井号 | 有效孔隙度/% | 含气饱和度/% | 渗透率 /(10-3 μm2) | 层位 | 含气水层与气层 渗透率比值 | 射孔井段 /m | 综合测井解释结果 | 厚度 /m |
---|---|---|---|---|---|---|---|---|
苏X-1 | 13.21 | 33.84 | 0.43 | 盒8 | — | 3 443.1~3 448.1 | 含气水层 | 5 |
11.87 | 53.09 | 0.76 | 山1 | 0.56 | 3 452.8~3 456.4 | 气层 | 3.6 | |
苏X-2 | 7.6 | 68.00 | 0.64 | 山1 | — | 3 451.0~3 454.4 | 气层 | 3.4 |
7.4 | 39.10 | 0.56 | 0.87 | 3 462.7~3 466.2 | 含气水层 | 3.5 |