基于储集层非均质性的水平井泄油半径分段定量表征

doi:10.7657/XJPG20260212

摘要/Abstract

摘要：

针对稠油油藏水平井蒸汽吞吐后水平段开采不均、精细挖潜难度大，现有方法多将水平段整体计算，忽略非均质性造成的动用不均衡，导致对剩余油分布认识不清、精细挖潜方向不明确，提出了水平井分段泄油半径计算方法，该方法采用声波时差表征储集层非均质性，以相邻声波时差平均值差异大于15%为标准，对水平井进行分段划分；利用单井采出程度、波及系数与驱油效率的关系，建立泄油半径计算模型，用于分段计算泄油半径，定量表征泄油面积，精准定位剩余油分布区。利用建立的新模型，对春光油田春10区块稠油油藏水平井泄油半径进行定量计算，结果显示：该区储集层非均质性强，利用声波时差将其划分为多段，各段泄油半径变化大，同井变化为5~110 m，水平段内部动用严重不均衡。依据剩余油分布特征，优化靶心方向，精准部署的加密井有效避免了老井泄油波及的影响，取得较好的开发效果。为非均质储集层水平井泄油半径计算提供了新方法，可简便、快速计算单井泄油半径，为稠油油藏蒸汽吞吐后进一步精细开发提供技术支撑。

关键词: 春光油田, 春10区块, 稠油油藏, 水平井, 泄油半径, 计算模型, 分段定量表征

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

中图分类号:

TE345
TE357

黄郑, 刘宇, 樊晓伊, 秦玲, 陶帅, 杨菲. 基于储集层非均质性的水平井泄油半径分段定量表征[J]. 新疆石油地质, 2026, 47(2): 233-240.

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.

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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