松辽盆地北部致密油钻采一体化方案提产降本提效设计创新与实践

doi:10.3969/j.issn.1002-302x.2022.02.007

摘要/Abstract

摘要： 松辽盆地北部致密油具有储层单层厚度薄、纵向集中度差、横向连续性差的地质特点，开发难度大，为此开展了钻采一体化方案提产降本提效探索与实践。针对地面及地下特点，钻井设计优化为平台式布井，水平井由3层变2层，井眼进行瘦身；二维水平井通过上移造斜点，减小造斜率、摩阻和扭矩；三维水平井采取“先平面提前造斜、后扭方位”的方式。优选超深穿透、等孔径射孔弹，直井、定向井设计16孔/m孔密，135°相位角；水平井设计20孔/m孔密，60°相位角。应用相控地质模型，确定裂缝半长为250~300m，裂缝间距为10~15m，支撑剂类型为70~140目+40~70目+20~40目组合粒径石英砂。按照压裂后初期放喷、快速排液、正常生产3个阶段进行排采制度研究，实现全生命周期举升工艺优化。最终形成了适合松北致密油储层特征的多薄层斜直井、主力层水平井、主薄层直平联合的一体化方案优化方法；定型了以大平台钻井、超深穿透等孔径射孔、复合高效压裂、全生命周期举升为核心的提产降本提效设计技术，致密油区块实现效益建产，建成产能超百万吨。

关键词: 致密油, 一体化, 方案设计, 数值模拟, 效益建产, 松辽盆地北部

Abstract: Tight oil reservoirs in the northern Songliao Basin are geologically characterized for small thickness of a single layer, poor vertical concentration and poor horizontal continuity. To overcome the difficulties in development of the tight oil reservoirs, the drilling-production integration plan was studies and put into practice to increase production and cost-effectiveness. Based on the on-the-surface and underground characteristics, the drilling design was optimized as the platform-style well pattern. The horizontal well was changed to two layers from three ones with holes slimmed. As for the two-dimensional horizontal well, the build-up point was moved up to reduce the build-up rate, friction and torque. The three-dimensional horizontal well adopted the method of “first plane build-up in advance and then twist orientation”. The ultra-deep penetrating and equal-aperture perforation charges were preferred. Both vertical well and directional well were designed to have a density of 16 holes per meter and a phase angle of 135°, while the horizontal well was designed with a density of 20 holes per meter and a phase angle of 60°. The facies-controlled geological model was used to determine that the half length of the fracture was 250 meters to 300 meters, the fracture spacing was 10 meters to 15 meters, and the type of the proppant was quartz sand with a combination of particle sizes – 70 mesh to 140 mesh + 40 mesh to 70 mesh + 20 mash to 40 mesh. The research on the drainage and production system was based on the three stages of initial blowout, rapid drainage and normal production after fracturing to optimize the lifting process in the whole life cycle. Finally, the optimization method for an integration plan was formulated to meet the characteristics of northern Songliao Basin tight oil reservoirs, which were a combination of multi-layer thin inclined and vertical wells, horizontal wells for main layers and straight and flat wells for main thin layers. As a result, the design technology for higher production and cost-effectiveness focusing on large-platform drilling, ultra-deep penetration and other aperture perforation, compound high-efficiency fracturing and whole-life-cycle lifting was finalized to construct the cost-effective productivity of more than 1 million tons for the tight oil block.

中图分类号:

TE355

蒋国斌　蔡萌　赵明. 松辽盆地北部致密油钻采一体化方案提产降本提效设计创新与实践[J]. 石油科技论坛, 2022, 41(2): 53-61.

Jiang Guobin, Cai Meng, Zhao Ming. Research and Practice of Tight Oil Drilling and Production Integration Plan Innovatively Designed for Higher Production and Cost-effectiveness in Northern Songliao Basin[J]. Petroleum Science and Technology Forum, 2022, 41(2): 53-61.

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