摘要
吉林油田受低渗透、低丰度等基本地质特征及低油价的双重影响,近年来新区百万吨产能建设投资达95亿元,老区常规重压产出投入比不足1.0,效益建产、稳产难度加大。为应对上述挑战,实现油田低成本高效开发,提出以"大压裂"技术理念为核心的地质工程一体化新内涵,在以新立油田为代表的低渗透油田开展一系列技术研究和现场试验。地质工程一体化新内涵主要体现在以下几个方面:(1)围绕工程技术需求,对区块的分层产出、吸水、压力、裂缝方位及储隔层应力等资料进行再录取认识,从而提高方案设计的针对性。(2)根据压裂工艺及施工需求,重新优化钻井井身结构及地面井位,优化钻井平台井数,保证建产投资总额最低。(3)与前期地质再认识、钻井再优化相结合,构建以"转向压裂、蓄能压裂、调堵压裂、干扰压裂"为主的压裂技术系列,提高区块压裂效果。(4)创新采油、注水、地面工程、物联网等一系列配套技术,降低一次性投资,降低运行成本。技术模式在以Ⅲ区块3号平台为代表的新区产建和Ⅵ区块中部为代表老区挖潜领域应用并获得显著效果,3号平台油井初产、稳产较主体区分别提高40%、57%,投资收益率提高8.2%,百万吨产建投资降低16%;Ⅵ区块中部压后投产16个月,单井累计增油超过400t,增产效果是常规压裂的4倍,产出投入比大于2.0。实践表明,对于地质情况认识相对清楚的低渗透油田,采取以工程为核心的地质工程一体化模式,是应对目前油田效益开发难度大这一难题的有效措施。
In recent years, Jilin oilfield invests 9.5 billion yuan for the productivity construction of one million tons in the new areas, and the output-to-input ratio of conventaionl refracturing in old areas is less than 1.0, and profitable productivity construction and stable prodution becomre more and more difficult due to the dual effect of its basic geological characteristics （low permeability and low abundance） and low oil price. In order to deal with these challenges and realize low-cost efficient development in Jilin oilfield, the new connotation of geology- engineering integration with the techncial concept of ＂large fracturing＂ as the core was proposed, and then a series of technological research and field test were carried out in low permeability oilfields, e.g. Xinli oilfield. The new connotation of geology-engineering integration is embodied as follows. First, according to the engineering and technological requirements, the data of the block is acquired and recognized again, including stratified yield, hydroscopicity, pressure, fracure azimuth and the stress of reservoir and barrier, so that the project design will be more targeted. Second, according to the fracturing technology and construction requirements, the well structure and surface location of the wells are reoptimized and the number of drilling platforms are optimized so as to minimize the total productivity construction investment. Third, based on previous geological recognition and drilling optimization, a series of fracturing technologies with ＂turnaround fracturing, energized fracturing, plugging contorl fracturing and interference fracturing＂ as the main parts are developed. And fourth, a series of supporting technologies are innovated, including oil production, water injection, surface engineering and Internet of Things, to reduce the disposable investment and cut down the operation cost. This technological mode is applied to the productivity construction of new areas （e.g. No.3 platform in block III） and the potential tapping of old areas （e.g. the middle area of block VI）, and the application results are remarkable. Compared with the main area, No.3 platform is 40% higher in initial production, 57% higher in stable production, 8.2% higher in return rate and 16% lower in productivity construciton investment of one million tons. After fracturing is carried out in the middle of block VI, the single- well cumulative oil increment is over 400 t in the commissioning period of 16 months, its stimulation result is 4 times of the conventional fracturing result, and the output-to-input ratio is higher than 2.0. It is practically indicated that the integrated geology and enginnering mode with the engineering as the core is currently the effective way to solve the difficulty of profitable development in the low permeability oilfields whose geological situations are understood more definitely.
作者
许建国
赵晨旭
宣高亮
何定凯
Xu Jianguo;Zhao Chenxu;Xuan Gaoliang;He Dingkai(Petro China Jilin Oilfield Compan)
出处
《中国石油勘探》
CAS
北大核心
2018年第2期37-42,共6页
China Petroleum Exploration
基金
国家科技重大专项"致密油储层高效体积改造技术"(2016ZX05046-004)
关键词
地质工程一体化
低渗透油田
压裂改造
低成本工程技术
geology-engineering integration, low permeability oilfield, fracturing stimulation, low-cost engineering technlogy
