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中国石油勘探  2019, Vol. 24 Issue (2): 203-209    DOI: 10.3969/j.issn.1672-7703.2019.02.008
  石油地质 本期目录 | 过刊浏览 | 高级检索 |
低渗透薄层难动用边际油藏地质工程一体化技术——以滨里海盆地Zanazour油田为例
张合文1, 崔明月1, 张宝瑞2, 赫安乐1, 晏军1, 梁冲1, 郭双根2, 贾洪革2, 马良3
1 中国石油勘探开发研究院;
2 中油阿克纠宾油气股份公司;
3 一龙恒业石油工程技术有限公司
Geology-engineering integration for low-permeability and thin marginal reservoirs: a case study on Zanazour oilfield, Pre-Caspian Basin
Zhang Hewen1, Cui Mingyue1, Zhang Baorui2, He Anle1, Yan Jun1, Liang Chong1, Guo Shuanggen2, Jia Hongge2, Ma Liang3
1 PetroChina Research Institute of Petroleum Exploration & Development;
2 CNPC(Aktobe) Oil and Gas Company;
3 Yilong Hengye Petroleum Engineering Technology Co., Ltd
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摘要 滨里海Zanazour油田已持续开发20多年,主体区采出程度高、地层压力低,作为油田开发的潜力区,主体构造边部油藏渗透率低、有效油层厚度薄,常规直井开发方式单井产量低、有效开发难度大。为了解决以上难点,实现边际油藏的有效开发,提出了水平井地质工程一体化技术,在以Zanazour油田为代表的边际油藏开展了一系列攻关研究和现场实践。低渗透、薄层边际油藏地质工程一体化技术,以水平井分段压裂为主要手段,从顶层设计出发,匹配地质、油藏特征,实现钻完井工程、分段压裂、采油工程的有机融合,主要体现在以下几方面:①根据水平井分段压裂对产量的影响,有效储层的孔隙度下限从8%下降到了4%~5%。②综合考虑地应力分布、人工裂缝走向、有效油层厚度及其分布等因素,优选水平段目的层并确定水平段方位。③为了提高分段压裂有效性,使用旋转地质导向和随钻测井技术,在1.4~6.1m的薄油层中钻遇率从20.7%提高到72%。④多举措提高水平段固井质量及抗射孔、压裂等作业的冲击能力,保证分段的有效性。⑤考虑水平段非均质性,按照"一段一方案"的原则,优化分段改造方案及施工参数。⑥为了实现低压储层分段压裂后的有效返排,优化配套了气举和液氮助排技术。所形成的技术体系在以H8井为代表的边部开发井获得了应用并获得突破,H8井分段压裂后的产量是邻井产量的11倍。目前共完成了8口井的现场试验,实现累计增产原油11×104t。实践表明,对于直井开发效益低的低渗透、薄层边际油藏,采用以分段压裂为主要手段的地质工程一体化技术模式,可以实现此类油藏的有效开发。
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张合文
崔明月
张宝瑞
赫安乐
晏军
梁冲
郭双根
贾洪革
马良
关键词 一体化边际油藏分段压裂水平井    
Abstract:After developing for more than 20 years, the main part of the Zanazour oilfield in the pre-Caspian Basin, has demonstrated high recovery efficiency and low reservoir pressure. However, the marginal reservoirs with low permeability and thin pay remain a challenge for effective development, with only low productivity by conventional vertical wells. To develop these low-permeability and thin reservoirs, a horizontal well geology-engineering integration technology system was proposed, and a series of research and field test were carried out. This technology system organically integrates drilling and completion, staged fracturing and oil production engineer with consideration to geologic and reservoir characteristics. It is manifested in six aspects. First, the lowest effective porosity is reduced from 8% to 4%-5% considering the influence of horizontal well staged fracturing on production. Second, preferable target layers are selected and horizontal section orientation is determined depending on stress distribution, orientation of induced fractures, and thickness and distribution of pay zones comprehensively. Third, rotary geosteering and LWD techniques are combined to increase the drill-in rate of thin layers (1.4-6.1 m) from 20.7% to 72%. Fourth, multiple measures are taken to improve the cementing quality in horizontal section and the resistance to impact by perforation and fracturing operations. Fifth, the staged fracturing design and parameters are optimized in accordance with the principle of "one design for on stage" by considering the heterogeneity of horizontal section. Sixth, gas lift and liquid nitrogen assisting flowback techniques are adopted for low-pressure reservoirs. The technology system has been successfully applied in development wells (e.g. H8) in marginal reservoirs. Well H8's post-fracturing production is 11 times of the adjacent well. So far, field test has been completed in 8 wells, revealing a cumulative oil production added by 11×104t. Thus, the geology-engineering integration technology system represented by staged fracture is proved efficient for low-permeability and thin marginal reservoirs.
Key wordsintegration    marginal reservoir    staged fracturing    horizontal well
收稿日期: 2018-09-06      出版日期: 2019-03-15
ZTFLH:     
基金资助:国家科技重大专项“中亚和中东地区复杂碳酸盐岩油气藏采油采气关键技术研究与应用”(2017ZX05030005)。
引用本文:   
张合文, 崔明月, 张宝瑞, 赫安乐, 晏军, 梁冲, 郭双根, 贾洪革, 马良. 低渗透薄层难动用边际油藏地质工程一体化技术——以滨里海盆地Zanazour油田为例[J]. 中国石油勘探, 2019, 24(2): 203-209.
Zhang Hewen, Cui Mingyue, Zhang Baorui, He Anle, Yan Jun, Liang Chong, Guo Shuanggen, Jia Hongge, Ma Liang. Geology-engineering integration for low-permeability and thin marginal reservoirs: a case study on Zanazour oilfield, Pre-Caspian Basin. China Petroleum Exploration, 2019, 24(2): 203-209.
链接本文:  
http://www.cped.cn/CN/10.3969/j.issn.1672-7703.2019.02.008      或      http://www.cped.cn/CN/Y2019/V24/I2/203
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