不同非均质砾岩油藏聚合物驱模拟实验

Abstract

Abstract:

Because of the strong heterogeneity and complex modal pore structure, the develop dynamic of the conglomerate reservoirs are more complex than those of the sandstone reservoirs. At present, the conglomerate reservoirs in Xingjiang have been in high water cut stage. It faces the problems such as the serious water channeling, low recovery rate, and great production difficulty,so it is necessary to carry out the polymer flooding evaluation experiment of the conglomerate reservoirs to provide references for designing the later development in maturing field. Taking the lower Karamay formation in No. 7 reservoir in east district of Karamay Oilfield as an example, we choose different heterogeneous models for the displacement experiments to analyse the effects of interlayer heterogeneity on the recovery and polymer channeling. The results prove that the producing reserves in the medium-low permeability cores of the strong heterogeneity model are very low, and the oil recovery in the experiment is mostly from the extraction of the high permeability core. There is still a large amount of oil remaining in the core. During the displacement, the serious polymer channeling exists in all test groups, which greatly reduced the sweep efficiency. It is a challenge of dealing with polymer channeling in the future development of the conglomerate reservoir.

Key words: conglomerate reservoir, interlayer heterogeneous, recovery, polymer channeling

CLC Number:

TE357

Tan Xin,Pu Wanfen,Wang Ning,Wang Li,Sun Boshuai. Polymer displacing modeling experiment of conglomerate reservoir with different interlayer heterogeneous[J].Reservoir Evaluation and Development, 2018, 8(4): 52-57.

Figures/Tables 5

Table 1

Fig. 1

Table 2

Table 3

Fig. 2

References 20

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组号	高渗组		中渗组		低渗组		平均渗透率/10^-3μm²	变异系数,f
组号	渗透率/10^-3μm²	孔隙度,%	渗透率/10^-3μm²	孔隙度,%	渗透率/10^-3μm²	孔隙度,%	平均渗透率/10^-3μm²	变异系数,f
1	945	24.03	418	17.67	120	17.67	494	0.70
2	1 101	32.17	276	15.76	85	17.98	494	0.88
3	2 061	17.73	859	19.23	233	17.98	1 051	0.72
4	2 318	16.31	455	17.80	259	15.63	1 010	0.91
5	3 864	32.44	1 606	31.44	535	15.64	2 001	0.69
6	4 546	33.39	1 101	16.31	417	17.62	2 021	0.89
7	9 820	29.70	3 882	31.8	1 455	21.60	5 052	0.70
8	11 081	33.72	3 035	32.52	1 107	17.04	5 074	0.85

组号	岩心类型	原始含油饱和度	不同阶段采收率			模型综合采收率
组号	岩心类型	原始含油饱和度	水驱	聚合物驱	后续水驱	模型综合采收率
1	高渗	87.90	54.31	64.65	83.85	67.91
	中渗	87.00	32.03	42.75	67.75
	低渗	86.45	15.65	30.15	52.14
2	高渗	90.50	59.47	81.06	86.74	44.63
	中渗	80.30	4.88	36.59	47.15
	低渗	82.41	0	0	0
3	高渗	86.20	42.74	53.65	68.70	50.00
	中渗	73.80	21.74	45.02	62.24
	低渗	66.42	0	14.29	19.05
4	高渗	89.11	49.40	63.69	76.19	31.00
	中渗	74.90	0.00	8.80	16.80
	低渗	72.10	0	0	0
5	高渗	88.74	39.34	46.72	63.37	39.51
	中渗	86.52	10.71	34.82	55.16
	低渗	85.63	0	0	0
6	高渗	77.63	48.42	68.78	82.81	27.60
	中渗	78.88	0	0	0
	低渗	80.21	0	0	0
7	高渗	83.40	48.82	67.30	69.19	23.06
	中渗	83.27	0	0	0
	低渗	75.90	0	0	0
8	高渗	83.53	35.77	67.07	76.02	25.34
	中渗	89.10	0	0	0
	低渗	84.30	0	0	0

组别	平均渗透率/ 10^-3μm²	变异系数,f	窜流开始（PV）, f	高渗层吸液百分数, %	窜流完全形成（PV）, f	高渗层吸液百分数, %	聚窜高峰值/ （mg·L^-1）
1	494	0.7	0.66	37	1.43	70	493.64
3	1 051	0.72	0.18	58	0.72	100	863.46
5	2 001	0.69	0.14	54	0.28	68	279.65
7	5 052	0.7	0	100	0.07	100	1 401.54
2	494	0.88	0.55	64	0.88	75	279.65
4	1 010	0.91	0	100	0.09	100	1 445.77
6	2 021	0.89	0	100	0.09	100	883.64
8	5 074	0.85	0	100	0.07	100	1 468.85

Polymer displacing modeling experiment of conglomerate reservoir with different interlayer heterogeneous

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