东方1-1气田经济高效开发实践及认识
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摘要
莺歌海盆地东方1-1气田具有面积大、各气组含气面积叠合性差、储量丰度低、储层非均质性强和非烃组分含量高等特点。为达到经济高效开发气田的目的,针对该气田特点及开发过程中的主要矛盾,在对储层非均质性详细研究的基础上,以高分辨率三维地震技术落实构造、刻画砂体,寻找出海上浅层低渗透气藏的"甜点"——相对高的孔渗体(带),利用大位移长水平井段钻井技术来提高单井的控制产能,通过两期开发及后续调整井的分步实施,实现了对该气田的经济高效开发,其产量满足了下游产业的用气需求。此外,针对长水平段井产能测试困难的问题,提出了适应水平井的稳定产能测试新方法,成功解决了生产管理过程中的难题,达到了少井高产、高效开发海上气田的目标,为类似气田的开发提供了经验。
Gas zones at different areas are isolated from each other in the widely distributed Dongfang 1-1 Gas Field in the Yinggehai Basin,where reservoirs with great heterogeneity have low abundance of reserves and high content of non-hydrocarbon components.In view of this,based on the detailed study of the heterogeneity of reservoirs in this field,the high-resolution 3D seismic techniques are adopted to identify structures,describe sandbodies,and find the sweet spots in the low-permeability gas reservoirs at shallow sea-beds.On this basis,the long lateral or "extended reach" horizontal wells are used to improve the single-well productivity.Through field practices after two-stage development,more new techniques and methods have been employed to achieve economic and highly-efficient development of this field and the gas production capacity will meet the needs of the down-stream users.In addition,new methods for testing the deliverability of long-lateral horizontal wells are presented to develop offshore gas fields efficiently with high production and cost-effectively with few wells.The successful experience in this field will provide reference for the development of similar gas fields in the future.
Gas zones at different areas are isolated from each other in the widely distributed Dongfang 1-1 Gas Field in the Yinggehai Basin,where reservoirs with great heterogeneity have low abundance of reserves and high content of non-hydrocarbon components.In view of this,based on the detailed study of the heterogeneity of reservoirs in this field,the high-resolution 3D seismic techniques are adopted to identify structures,describe sandbodies,and find the sweet spots in the low-permeability gas reservoirs at shallow sea-beds.On this basis,the long lateral or "extended reach" horizontal wells are used to improve the single-well productivity.Through field practices after two-stage development,more new techniques and methods have been employed to achieve economic and highly-efficient development of this field and the gas production capacity will meet the needs of the down-stream users.In addition,new methods for testing the deliverability of long-lateral horizontal wells are presented to develop offshore gas fields efficiently with high production and cost-effectively with few wells.The successful experience in this field will provide reference for the development of similar gas fields in the future.
引文
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[4]赵斌,李闽,吴月先,等.我国复杂油气藏水平井规模化开发成效及进展[J].钻采工艺,2011,34(1):1-3.
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[9]程林松,李春兰,郎兆新,等.分支水平井产能的研究[J].石油学报,1995,16(2):49-55.
[10]黄世军,程林松,赵凤兰,等.薄互层油藏中阶梯水平井产能评价模型研究[J].西南石油大学学报,2007,29(3):60-65.
[11]蒋艳芳,张烈辉,刘启国,等.应力敏感影响下低渗透气藏水平井产能分析[J].天然气工业,2011,31(10):54-56.
[12]庄惠农.气藏动态描述和试井[M].北京:石油工业出版社,2003:94-103.
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