Segmented Quantitative Characterization of Drainage Radius of Horizontal Well Based on Reservoir Heterogeneity

doi:10.7657/XJPG20260212

Abstract

Abstract:

Steam stimulation in horizontal wells in heavy oil reservoirs fails to achieve uniform exploitation and precise potential tapping via horizontal section. Conventional methods mostly consider the horizontal section as a whole, but overlook unbalanced producing due to reservoir heterogeneity, leading to vague understanding of remaining oil distribution and indefinite direction of potential tapping. This paper presents a segmented method of calculating drainage radius of a horizontal well. This method employs acoustic time difference (AC) to characterize reservoir heterogeneity, with the difference between adjacent AC averages >15% as a threshold to segment horizontal section. Depending on the relationship among single-well recovery efficiency, sweep efficiency, and displacement efficiency, a drainage radius calculation model is constructed to determine segment-specific drainage radius, quantitatively characterize drainage area, and accurately map remaining oil distribution zones. The application of this model in the heavy oil reservoir in the Chun 10 block of Chunguang oilfield reveals that the reservoir in the block is highly heterogeneous, where the segments of horizontal section divided by AC are greatly varying in drainage radius - from 5 to 110 m in individual wells, and the recovery is extremely disproportionate along the horizontal section. Guided by remaining oil distribution patterns, target orientations are optimized, and accordingly infill wells are accurately placed to effectively avoid the drainage interference from existing wells, thereby achieving enhanced development effects. This study provides a new method for calculating drainage radius of horizontal well in heterogeneous reservoirs, which enables a simple and rapid determination of single-well drainage radius, offering a technical support for further development of heavy oil reservoirs after steam stimulation.

Key words: Chunguang oilfield, Chun 10 block, heavy oil reservoir, horizontal well, drainage radius, calculation model, segmented quantitative characterization

CLC Number:

TE345
TE357

HUANG Zheng, LIU Yu, FAN Xiaoyi, QIN Ling, TAO Shuai, YANG Fei. Segmented Quantitative Characterization of Drainage Radius of Horizontal Well Based on Reservoir Heterogeneity[J]. Xinjiang Petroleum Geology, 2026, 47(2): 233-240.

Figures/Tables 8

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

Table 1.

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Fig. 7.

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分段	声波时差/ （μs·m^-1）	起点/ m	终点/ m	射孔段长度/m	劈分产油量/t	有效厚度/m	单井控制储量/t	采出程度/%	泄油面积/m²	泄油半径/m
1	200	1 280	1 306	26	782.79	4	11 692.2	6.69	1 401.48	21
2	420	1 306	1 320	14	451.25	4	1 528.8	29.52	1 242.07	44
3	230	1 320	1 332	12	211.81	4	1 310.4	16.16	787.84	33
4	480	1 332	1 340	8	294.70	4	873.6	33.73	758.76	47
5	280	1 340	1 346	6	128.93	4	655.2	19.68	434.64	36
6	500	1 346	1 361	15	575.58	4	1 638.0	35.14	1 452.01	48
7	350	1 361	1 372	11	295.46	4	1 201.2	24.60	890.88	40
8	460	1 372	1 383	11	388.32	4	1 201.2	32.33	1 021.33	46
9	300	1 383	1 408	25	1 151.16	4	11 583.0	9.94	2 080.42	26