海上薄互层油田层系重组定量方法研究

摘要/Abstract

摘要：

PL油田属于典型的海上薄互层油藏,具有纵向跨度大,薄层占比大等特点。在开发过程中由于前期采用大段合采,层间干扰严重,导致纵向均衡动用程度差,整体开发效果差,为了改善油田开发效果,有必要重组开发层系。首先建立了层系重组有效性判断数学模型,针对PL油田的特点,运用数值模拟建立机理模型,得出油价与调整井平均单井累产油量图版以及目前油价和原始地层条件下层系调整最小油层厚度关系图版;并利用数值模拟开展油藏开发阶段、净毛比、流度级差对层系最小厚度影响的校正曲线研究,建立了层系厚度下限公式,应用在PL油田可使采收率提高6.1 %。提出的这套全新的层系重组定量方法的思路,对PL油田及类似油田的高效开发具有指导作用。

关键词: 薄互层, 大跨度, 层系重组, 厚度界限, 定量方法

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

中图分类号:

TE325

向红,唐海,苏彦春,张章,吕栋梁. 海上薄互层油田层系重组定量方法研究[J]. 油气藏评价与开发, 2018, 8(5): 1-7.

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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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