二连盆地乌里雅斯太油田低品位储量效益开发对策与实践

doi:10.3969/j.issn.1672-7703.2026.01.015

摘要/Abstract

摘要： 乌里雅斯太油田作为二连盆地典型低孔、特低渗油田之一，经过多年勘探开发，近年来开发形势日趋严峻，面临资源接替能力弱、优质储层难落实、直井开发效益差的问题。为此，借鉴致密油提质增效理念，立足于存量储量区，探索形成低品位储量效益开发新对策：（1）精准选区选层，通过相控油藏单元解剖及精细开发成效分析，明确有利储层分布及油藏发育特点，优选具有水平井开发潜力的剩余资源，支撑井位部署；（2）精巧井位设计，建立低品位油藏水平井部署原则，个性化设计井斜角<85°的“厚层顶底穿”、“薄油层专打”、“上下铺挑打”（纵向多层穿透式钻井）水平井模式，确保甜点钻遇率及钻探效益；（3）强化现场随钻跟踪及钻后精准评价，优化储层改造及补能方式，采用“压前蓄能、分段多簇、层内暂堵、层间转向、在线变粘”的方式，提升油藏改造效果。基于上述技术序列，乌里雅斯太油田T21 区块通过试验“井斜角<85°的水平井+高强度体积压裂”开发方式，用直井1.5倍的钻井投资获得了平均单井EUR提升至3倍、初期平均单井日产油提高3~4倍的产出增量，开发效益大幅提升。所形成的低品位储量效益开发新对策，有效推动了乌里雅斯太油田及二连盆地其它低品位资源快速转化，阶段性成果显著，具备推广应用潜力。

关键词: 二连盆地, 乌里雅斯太油田, 低品位储量, 效益开发, 水平井

Abstract: As one of the typical low porosity and ultra-low permeability oilfields in Erlian Basin, the development situation of Wuliyasitai Oilfield is becoming more and more serious in recent years after years of exploration and development. It is faced with the problems of weak resource replacement ability, difficult implementation of high-quality reservoirs and poor benefit of vertical well development.Therefore, based on the stock reserves area, some new technologies for profitable development of low-grade reserves are explored and formed by referring to the concept of tight oil efficiency development: (1) Accurately select the favorable zones and layers, through the analysis method of reservoir unit based on sedimentary microfacies and the meticulous analysis of development effect , the favorable reservoir distribution and reservoirs development characteristics are clarified, and the types of remaining resource reservoirs with horizontal well development potential are optimized to support the well location deployment. (2) Precise and ingenious well location designing, established the deployment principle of horizontal wells in low-grade reservoirs, and innovatively designed three horizontal well models with a deviation angle of less than 85°to ensure the dessert drilling ratio and drilling efficiency, including the models of “Drilling through thick oil layer from top to bottom” , “thin oil layer targeted drilling”, “targeted drilling in the upper and lower oil layer dessert”(longitudinal multi-layer penetrating drilling). (3) By strengthening on-site tracking while drilling and accurate evaluation after drilling, the reservoir reconstruction is transformed from the early “ large-scale long fracture reconstruction mode ” to the “close cutting volume reconstruction mode ” to improve the reservoir reconstruction effect. Based on the above technical sequence, by testing the development method of “horizontal well with inclination angle less than 85°+ high strength volume fracturing” in T21 block of Wuliyasitai Oilfield, the average single well EUR of is increased to 3 times and the initial average single well daily oil production is increased by 3 to 4 times with the drilling investment equivalent to 1.5 times of vertical well, and the development benefit is greatly improved. The newly formulated strategies for the economic development of low-grade reserves have effectively promoted the rapid transformation of low-grade resources in Wuliyasitai Oilfield and other low-grade resources in Erlian Basin. The phased achievements are notable, and the approach exhibits considerable potential for popularization and application in relevant fields.

Key words: Erlian Basin, Wuliyasitai oil field, low-grade reserves, profitable development, horizontal well

中图分类号:

唐小玲, 武跃伟, 杨经栋, 高澜, 马黎敏, 吴旺林, 潘勇利, 晁先秋. 二连盆地乌里雅斯太油田低品位储量效益开发对策与实践[J]. 中国石油勘探, 2026, 31(1): 205-216.

Tang Xiaoling, Wu Yuewei, Yang Jingdong, Gao Lan, Ma Limin, Wu Wanglin, Pan Yongli, Chao Xianqiu. Strategy and practice of profitable development of low-grade reserves and its practice in Wuliyasitai Oil Field, Erlian Basin[J]. China Petroleum Exploration, 2026, 31(1): 205-216.

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