三塘湖盆地致密油加密井体积压裂技术研究与实践
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摘要
三塘湖盆地马56区块致密油前期采取水平井体积压裂改造后,仍有大量的地质储量无法得到有效动用,整体采收率只有3%,各井间和缝间仍有大量剩余油可供挖潜。为了进一步提高区块致密油单井产量以及采收率,在研究和总结国内外致密油藏体积压裂效果的基础上,采取地质工程一体化攻关,针对性地提出了高密度布井+细分切割体积压裂的技术路线,即通过对井网及人工裂缝实施双加密的方式,实现井筒及裂缝对整个储层地质储量的"全覆盖",最大限度提高储层的动用程度。配套形成了井网加密、长水平段钻井、细分切割交错布缝、注水蓄能及低成本体积压裂5项关键技术。现场推广应用41口井,有效率达100%,平均单井日产油26.2t,累计产油量较前期基础井网提高39.7%,实现了效益开发,为区块致密油藏提高单井产量和采收率提供了技术支持。
In Block Ma 56 of the Santanghu Basin, a large quantity of tight oil in place remains unrecovered after stimulated by horizontal well volume fracturing, suggesting an overall recovery of only 3%. A considerable volume of remaining oil near wells and in fractures can be developed. In order to further improve the single-well productivity and recovery, the practices of volume fracturing of tight oil reservoirs around the world were reviewed. On this basis, a technology of densely-spaced wells + partitioned volume fracturing was proposed under the guidance of geological and engineering integration, that is, the densities of both well pattern and induced fractures are increased to ensure the wellbore and fracture system to cover all reserves in the reservoir, so that the reservoir productivity can be maximized. Moreover, five supporting techniques were developed, i.e. well infilling, long horizontal section drilling, partitioned and staggered fracture initiation, water injection, and low-cost volume fracturing. Application in 41 wells shows the effective rate is up to 100%, the average daily oil production per well is 26.2 tons, and the cumulative oil production increases by 39.7%. The technology is helpful to improving single-well productivity and recovery of tight reservoirs in Block Ma 56.
In Block Ma 56 of the Santanghu Basin, a large quantity of tight oil in place remains unrecovered after stimulated by horizontal well volume fracturing, suggesting an overall recovery of only 3%. A considerable volume of remaining oil near wells and in fractures can be developed. In order to further improve the single-well productivity and recovery, the practices of volume fracturing of tight oil reservoirs around the world were reviewed. On this basis, a technology of densely-spaced wells + partitioned volume fracturing was proposed under the guidance of geological and engineering integration, that is, the densities of both well pattern and induced fractures are increased to ensure the wellbore and fracture system to cover all reserves in the reservoir, so that the reservoir productivity can be maximized. Moreover, five supporting techniques were developed, i.e. well infilling, long horizontal section drilling, partitioned and staggered fracture initiation, water injection, and low-cost volume fracturing. Application in 41 wells shows the effective rate is up to 100%, the average daily oil production per well is 26.2 tons, and the cumulative oil production increases by 39.7%. The technology is helpful to improving single-well productivity and recovery of tight reservoirs in Block Ma 56.
引文
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[6]杜金虎,何海清,杨涛,李建忠,黄福喜,郭彬程,等.中国致密油勘探进展及面临的挑战[J].中国石油勘探,2014,19(1):1-9.Du Jinhu,He Haiqing,Yang Tao,Li Jianzhong,Huang Fuxi,Guo Bincheng,et al.Progress in China’s tight oil exploration and challenges[J].China Petroleum Exploration,2014,19(1):1-9.
[7]张映红,路保平,陈作,蒋海军.中国陆相致密油开采技术发展策略思考[J].石油钻探技术,2015,43(1):1-6.Zhang Yinghong,Lu Baoping,Chen Zuo,Jiang Haijun.Technical strategy thinking for developing continental tight oil in China[J].Petroleum Drilling Techniques,2015,43(1):1-6.
[8]胡文瑞.地质工程一体化是实现复杂油气藏效益勘探开发的必由之路[J].中国石油勘探,2017,22(1):1-5.Hu Wenrui.Geology-engineering integration-a necessary way to realize profitable exploration and development of complex reservoirs[J].China Petroleum Exploration,2017,22(1):1-5.
[9]章敬,罗兆,徐明强,江洪,陈仙江,王腾飞,等.新疆油田致密油地质工程一体化实践与思考[J].中国石油勘探,2017,22(1):12-20.Zhang Jing,Luo Zhao,Xu Mingqiang,Jiang Hong,Chen Xianjiang,Wang Tengfei,et al.Application of geologyengineering integration in development of tight oil in Xinjiang oilfield[J].China Petroleum Exploration,2017,22(1):12-20.
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[11]许建国,赵晨旭,宣高亮,何定凯.地质工程一体化新内涵在低渗透油田的实践——以新立油田为例[J].中国石油勘探,2018,23(2):37-42.Xu Jianguo,Zhao Chenxu,Xuan Gaoliang,He Dingkai.Application of the new connotation of geology-engineering integration in low permeability oilfields:a case study on Xinli oilfield[J].China Petroleum Exploration,2018,23(2):37-42.
[12]张杨,杨向同,滕起,徐永辉,薛艳鹏,徐国伟,等.塔里木油田超深高温高压致密气藏地质工程一体化提产实践与认识[J].中国石油勘探,2018,23(2):43-50.Zhang Yang,Yang Xiangtong,Teng Qi,Xu Yonghui,Xue Yanpeng,Xu Guowei,et al.Practice and cognition of geology-engineering integration for the production increasing of HTHP ultra-deep tight gas reservoir in Tarim oilfield[J].China Petroleum Exploration,2018,23(2):43-50.
[13]刘乃震,王国勇,熊小林.地质工程一体化技术在威远页岩气高效开发中的实践与展望[J].中国石油勘探,2018,23(2):59-68.Liu Naizhen,Wang Guoyong,Xiong Xiaolin.Practice and prospect of geology-engineering integration technology in the efficient development of shale gas in Weiyuan block[J].China Petroleum Exploration,2018,23(2):59-68.
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[15]郑立军,才博,冉凤华,刘朝武,张灵,李若华,等.致密油储层改造技术研究与应用[J].油气井测试,2015,24(1):4-7.Zheng Lijun,Cai Bo,Ran Fenghua,Liu Zhaowu,Zhang Ling,Li Ruohua,et al.Research on transformation technology of tight oil reservoir and its application[J].Well Testing,2015,24(1):4-7.
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[17]贾婷,何强,孙明.致密油区体积压裂效果分析[J].西安文理学院学报:自然科学版,2017,20(2):113-116.Jia Ting,He Qiang,Sun Ming.Analysis of volume fracturing effect in dense oil region[J].Journal of Xi’an University:Natural Science Edition,2017,20(2):113-116.
[18]彭晖,刘玉章,冉启全,王欣,童敏.致密油储层水平井产能影响因素研究[J].天然气地球科学,2014,25(5):771-777.Peng Hui,Liu Yuzhang,Ran Qiquan,Wang Xin,Tong Min.Study on the horizontal well production in tight oil reservoirs[J].Natural Gas Geoscience,2014,25(5):771-777.
[19]林旺,范洪富,王志平,童敏,王少军,刘立峰.致密油藏体积压裂水平井产量预测研究[J].油气地质与采收率,2018,25(6):107-113.Lin Wang,Fan Hongfu,Wang Zhiping,Tong Min,Wang Shaojun,Liu Lifeng.Prediction on production of volume fractured horizontal well in tight reservoirs[J].Petroleum Geology and Recovery Efficiency,2018,25(6):107-113.
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