Development Parameters of Chang 6 Reservoir in Shuanghexi Block of Yanchang Oilfield, Ordos Basin

doi:10.7657/XJPG20240506

Abstract

Abstract:

The Chang 6 reservoir in the Shuanghexi block of Yanchang oilfield in the Ordos basin is characterized by low permeability. Conventional calculation methods for development indices are not conducive to geological research, policy formulation and cost control for oilfield development. The production decline patterns, producing degree of reserves by water flooding, injection-production ratio, water cut, injected water utilization, and recovery of the Chang 6 reservoir were analyzed. The results show that the production of the Chang 6 reservoir follows a hyperbolic decline pattern. The block has significant potential for water injection development, with the current control degree and producing degree of reserves by water flooding at 74.54% and 36.94%, respectively, and an injection-production connection rate of 27.27%. The optimal injection-production ratio is approximately 2.5. As the recovery efficiency increases, the water cut rises rapidly at the first and then slows down. Based on the water retention rate, water consumption index, and water flooding index, it is evident that in the late stage of development, the water injection effectiveness improves, leading to an increase in ultimate recovery. During the development process, the water cut rise rate should ideally be kept below 6.1%, and the reasonable formation pressure should be maintained above 9.1 MPa. Under these conditions, the final recovery in the study area is approximately 23%.

Key words: Ordos basin, Chang 6 reservoir, decline pattern, producing degree of reserves by water flooding, injection-production ratio, water cut, injected water utilization, recovery

CLC Number:

TE341

CHEN Junjun, YANG Xingli, XIN Yichao, LIU Zhaoyang, TONG Bowen. Development Parameters of Chang 6 Reservoir in Shuanghexi Block of Yanchang Oilfield, Ordos Basin[J]. Xinjiang Petroleum Geology, 2024, 45(5): 552-559.

Figures/Tables 15

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开发层系	油井生产总厚度/m	注水井连通厚度/m	水驱储量控制程度/%
开发层系	油井生产总厚度/m	注水井连通厚度/m	厚度定义法	储量丰度定义法	改进的定义法
长$6_{1}^{1}$小层	555.6	464.4	83.59	91.91	78.60
长$6_{1}^{2}$小层	1 135.4	1 126.4	99.20	66.50	83.50
长$6_{2}^{1}$小层	310.8	201.3	64.76	88.24	61.52

开发层系	油井生产总厚度/m	注水井连通厚度/m	吸水厚度/ m	水驱储量动用程度/%
开发层系	油井生产总厚度/m	注水井连通厚度/m	吸水厚度/ m	定义法	水驱特征曲线法	改进的定义法
长$6_{1}^{1}$小层	555.6	464.4	245.3	52.82	43.51	41.51
长$6_{1}^{2}$小层	1 135.4	1 126.4	501.5	44.52	51.12	37.17
长$6_{2}^{1}$小层	310.8	201.3	105.2	52.26	42.11	32.15

开发层系	注采井网总有效厚度/m	注采连通有效厚度/m	注采未连通有效厚度/m			注采对应率/%	注采连通率/%
开发层系	注采井网总有效厚度/m	有注有采	有注无采	有采无注	无注无采	注采对应率/%	注采连通率/%
长$6_{1}^{1}$小层	14 757.54	5 096.60	1 996.11	787.10	1 891.63	53.39	34.54
长$6_{1}^{2}$小层	14 773.00	5 176.75	2 017.41	1 017.95	1 591.69	55.58	35.04
长$6_{2}^{1}$小层	9 679.20	1 183.96	1 763.06	395.84	3 007.02	34.53	12.23

开发时间/年	目前地层压力/ MPa	压力保持水平/ %	压降/ MPa	注采比
2012	5.68	42.39	7.72	1.17
2013	6.60	49.25	6.80	0.72
2014	7.41	55.30	5.99	0.91
2015	8.75	65.30	4.65	1.10
2016	9.69	72.31	3.71	1.63
2017	9.10	67.91	4.30	2.04
2018	8.86	66.12	4.54	1.92
2019	9.14	68.21	4.26	2.65

月注采比范围	井组数量	月注采比
<2.00	3	1.80
2.00~2.25	3	2.15
2.25~2.50	2	2.40
2.50~2.75	3	2.65
2.75~3.00	3	2.80
>3.00	1	3.40