海上薄互层油田层系重组定量方法研究

Abstract

Abstract:

PL oilfield, which belongs to the offshore reservoirs with thin interbeds, has long treatment interval and high thin layers. During the development, due to the serious interlaminar interference caused by the commingling production and serious interlayer interference in the earlier stage, the vertical balance level and the overall development effect are poor. In order to improve the oilfield development effects, it is necessary to reorganize the development layer. Firstly, we established the mathematic model of effective judgment of combination series of strata. Then, the chart boards of the relation between the oil price and average accumulative production of single adjustment well, and the relation between the current oil price and the thickness of the minimum layers adjusted by the original oil saturation were established by means of numerical simulation which was based on the characteristics of PL oilfield. Meanwhile, the equation of lower thickness limit of layers was acquired based on the research of correction curve of the influence of development stage, net/gross ratio and mobility difference on the minimum thickness of layers. The application in PL oilfield can make the recovery increased by 6.1 %. This new quantitative way for recombination of series of strata proposed can guide the efficient development of PL oilfield and similar oilfields.

Key words: thin interbed, large span, layer recombination, thickness limit, quantitative way

CLC Number:

TE325

Xiang Hong,Tang Hai,Su Yanchun,Zhang Zhang,Lyu Dongliang. Study on quantitative way for recombination of series of strata of reservoir in offshore with thin interbed[J].Reservoir Evaluation and Development, 2018, 8(5): 1-7.

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References 21

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含油饱和度,f	单井累产/10⁴m³	含油饱和度,f	单井累产/10⁴m³
0.5	3.401	0.64	5.731
0.55	4.224	0.68	6.343
0.6	5.064	0.76	7.552
0.62	5.407	0.78	8.018

净毛比,f	单井累产/10⁴m³	净毛比,f	单井累产/10⁴m³
1	8.018	0.4	2.833
0.8	6.287	0.3	1.955
0.6	4.568	0.2	1.068
0.5	3.702

流度级差,f	单井累产/10⁴m³	流度级差,f	单井累产/10⁴m³
1	8.018	6	6.114
2	7.443	8	5.901
3	6.900	10	5.783
4	6.451	12	5.704
5	6.272

层位	（亚）油组	厚度/m	渗透率/10^-3μm²	黏度/（mPa·s）	含油饱和度,%	净毛比,f
明下段	L30	35.4	800	260	70.6	0.253
明下段	L40	49.8	1 400	260	71.9	0.251
	L50^U	30.8	2 050	20	80.8	0.344
	L50^M	12.3	1 200	20	75.1	0.382
	L50^L	20	800	20	67.6	0.31
馆陶组	L60	33.5	430	20	59.7	0.337
	L70	45.7	650	20	69.2	0.232
	L80	52.9	700	30	68.2	0.274
	L90	48.8	1 000	30	70.5	0.26
	L100	68.4	980	30	69.8	0.297
	L110	90.8	250	30	58.4	0.133
	L120	156.4	300	30	55.0	0.051

层系	（亚）油组	流度级差,f	含油饱和度,f	净毛比,f	油层厚度界限/m	实际油层厚度/m
1	L30、L40	1.75	0.714	0.252	19.08	20.8
2	L50^U-L70	4.77	0.705	0.321	21.56	43.4
3	L80-L120	4	0.644	0.203	27.82	67.6

Study on quantitative way for recombination of series of strata of reservoir in offshore with thin interbed

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指标	累产油/10⁴m³	采收率,%	含水率,%	平均校正系数,f
方案一	2 878.77	34.30	89.95	2
方案二	2 824.23	33.70	93.99	2.15
方案三	2 855.59	34.01	93.32	2.05
方案四	2 880.54	34.32	92.90	1.96
现状方案	2 372.33	28.20	97.50	2.81