北布扎奇油田VI区的水流优势通道

doi:10.7657/XJPG20220418

摘要/Abstract

摘要：

为了研究北布扎奇油田水流优势通道的发育特征,以北布扎奇油田Ⅵ区为研究对象,利用流线型数值模拟技术对研究区目的层水流优势通道进行识别,并定量表征水流优势通道的发育程度及形成规律。结果表明,研究区Ⅰ类和Ⅱ类通道是无效循环水流通道,水驱波及系数仅为0.120~0.175,其中,Ⅰ类通道油井端含水率大于97%,平均波及系数为0.120,窜流极其严重;Ⅱ类通道油井端含水率93%~97%,平均波及系数为0.175,窜流很严重。水流优势通道的数量较少,体积有限,但占据了多数水量,导致注水低效。优势通道数量与注水井和产油井间的距离成反比;主河道位置是水流优势通道形成的主要区域,特别是注水井和生产井连线平行于主河道时;油井和水井的生产时间长、累计产液量与注水量比值高,日产液量较大的井附近形成优势通道的概率更高;并且通道随油井投产及注采关系调整而变化。

关键词: 北布扎奇油田, 水流优势通道, 流线型数值模拟, 定量表征, 稠油油藏, 波及系数

Abstract:

In order to understand the development characteristics of the dominant water flow channels in the North Buzachi oilfield, the dominant water flow channels in the target layers in Block VI of the oilfield were identified by using streamlined numerical simulation technology, and the development degree and formation pattern of the dominant water flow channels were quantitatively characterized. The results show that Class Ⅰand Ⅱ channels in the study area are the water flow channels with ineffective circulation, with water flooding sweep coefficient of only 0.120-0.175. For Class I channels, the water cut at the producer is greater than 97%, and the average sweep coefficient is 0.120, with extremely serious channeling. For Class II channels, the water cut at the producer ranges from 93% to 97%, and the average sweep coefficient is 0.175, with serious channeling. The dominant water flow channels are small in number and limited in volume, but they occupy most of the water volume, which results in inefficient water injection. The number of dominant channels is inversely proportional to the distance between injector and producer. The location of the main river channel is the main area where the dominant water flow channels are formed, especially in the direction that the connection line between the injector and the producer is parallel to the sedimentary direction of the main river channel. The longer the producing time of the producer and injector, and the higher the ratio of cumulative liquid production to water injection, the higher the probability of dominant channel occurs near the wells with high daily liquid production. Furthermore, the dominant water flow channels change with the initial production time of the producer and the adjustment of injector-producer relationship.

Key words: North Buzachi oilfield, dominant water flow channel, streamlined numerical simulation, quantitative characterization, heavy oil reservoir, sweep coefficient

中图分类号:

TE312

池云刚, 唐致霞, 魏静, 周惠泽, 张文辉. 北布扎奇油田VI区的水流优势通道[J]. 新疆石油地质, 2022, 43(4): 496-504.

CHI Yungang, TANG Zhixia, WEI Jing, ZHOU Huize, ZHANG Wenhui. Dominant Water Flow Channels in Block VI of North Buzachi Oilfield[J]. Xinjiang Petroleum Geology, 2022, 43(4): 496-504.

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层系	主力层	累计产油量/ 10⁴t	剩余油储量/ 10⁴t	波及系数	采出程度/ %	平均日产油量/ t	累计注采比	累计亏空/ 10⁴m³
白垩系	K₂-B₂	79.58	2 003.51	0.20	3.82	1.41	0.95	21.68
	K₂-B₁	19.28	174.93	0.29	9.93	0.58	0.79	25.20
	K₂-C₁	52.66	1 185.65	0.15	4.25	1.14	0.92	22.52
侏罗系	J₁-B	585.82	2 970.83	0.22	16.47	2.94	0.68	1 171.00
	J₁-C	133.51	802.22	0.18	14.27	1.50	1.13	-96.07
	J₂-A	213.86	1 340.93	0.19	13.76	2.40	0.92	106.82

产液量级别/ （m³·d^-1）	井数/ 口	平均日产液量/ m³	占总井数比例/ %	产液所占比例/ %	单井平均日产油量/ t
>115	87	16 060	12.0	50.23	6.40
>120	78	15 007	10.8	46.93	6.59
>150	57	12 139	7.9	37.96	7.20
>200	34	8 074	4.7	25.25	8.20
>250	9	2 472	1.2	7.73	6.61