Dominant Water Flow Channels in Block VI of North Buzachi Oilfield

doi:10.7657/XJPG20220418

Abstract

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

CLC Number:

TE312

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.

Figures/Tables 14

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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