水平井聚合物驱注采特征及井组效果影响因素分析

doi:10.13809/j.cnki.cn32-1825/te.2022.05.013

Abstract

Abstract:

In order to solve the problems that the effectual time and effective features of polymer flooding in horizontal wells of oilfields developed directly after natural energy development are quite different from those of polymer flooding in high water-cut periods, a more efficient and convenient way to determine the effectual time of polymer flooding is proposed by production dynamic analysis, that is the change features of production capacity, water cut and submergence depth. Based on the effectual time, the production period after polymer injecting is divided into the induced effective period, the dominant effective period and the subsequent effective period, and the relation between the injected pore volume and the stage is established. Then, a study has been conducted to characterize the changes in injection pressure, injection capacity, oil production capacity and integrated water content at different injection pore volumes, and the purpose and main content of the on-site measures at each stage have been clarified. According to the reservoir conditions in the polymer flooding well area and the outstanding problems exposed during the polymer flooding process, the influence of these factors on the development effect of the polymer flooding well group is evaluated and the main factors affecting the development effect of the current polymer flooding well group is clarified. This research provides a reliable basis for the efficient management of the oilfield polymer flooding well group on-site, and clarifies the target well areas of the subsequent conversion well group.

Key words: horizontal well, polymer flooding, dynamic features, influencing factor, well group optimization

CLC Number:

TE358

Depeng HU. Injection-production features of polymer flooding for horizontal wells and influencing factors of development effects for well groups[J]. Petroleum Reservoir Evaluation and Development, 2022, 12(5): 809-815.

Figures/Tables 13

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References 21

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注入阶段	对应的生产阶段	日产油变化特点	综合含水变化特点
诱导见效期注入阶段	诱导见效期	稳中有降	稳中油升
主导见效期注入阶段	上升期	快速大幅上升	先稳中有降,后上升
主导见效期注入阶段	高峰期	相对稳定	先持续上升,至中后期上升速度变缓
后续见效期注入阶段	递减期	先快速下降后缓慢递减	持续上升,后上升速度持续减缓

沉积微相分类	见效时间（d）	聚驱产油倍数（倍）	聚驱增油量（m³）	吨聚增油量（t）	提高采收率（%）
水下分流河道	126	4.74	24 175	119	13.5
前缘席状砂	139	4.33	18 574	93	10.1
水下分流河道间	156	3.12	11 553	52	6.7

黏度 (mPa·s)	见效时间（d）	含水95 %时注入PV数	聚驱增油量（m³）	吨聚增油量（t）	聚驱提高采收率（%）
<50	35	0.57	23 961	103	12.7
50~150	75	0.59	25 357	125	14.6
150~500	93	0.55	22 967	107	12.4
500~1 000	113	0.51	19 968	97	11.1
1 000~2 000	155	0.43	14 172	75	8.9
2 000~3 000	208	0.36	10 208	53	7.1
3 000~5 000	264	0.29	8 068	41	5.9
5 000~10 000	593	0.23	6 068	32	4.4

分类	累计注入天数（d）	累计注入量（m³）	累计注入孔隙体积（PV）	平均日注入量（m³）	平均注入压力（MPa）	平均注入质量浓度 (mg/L)
古隆起附近注入井	973	34 448	0.096	35.4	9.0	922
小层平均	1 134	93 487	0.286	82.5	5.3	1 104
差值	-161	-59 039	-0.190	-47.1	3.7	-182

分类	高峰期持续生产天数（d）	高峰期平均日产油量（m³）	高峰期累产油量（m³）
聚驱后投产油井	235	16.5	3 877.5
正常投产井	462	18.2	8 408.4

Injection-production features of polymer flooding for horizontal wells and influencing factors of development effects for well groups

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分类	见效时间（d）	聚驱增油量（m³）	吨聚增油量（t）	提高采收率（%）
古隆起附近见效井	212	5 995	35	3.7
小层平均	135	20 864	103	11.5
差值	-77	-14 869	-68	-7.8

注采方向数	见效井比例（%）	见效时间（d）	高峰期持续天数（d）	高峰期日增油量（m³）	聚驱增油量（m³）	吨聚增油量（t）	提高采收率（%）
单向	63	143	388	7.5	16 276	99	10.0
多向	86	114	526	14.6	24 781	122	13.7
差值		29	-138	-7.1	-8 505	-23	-3.7

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