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Complete Optimized Fracturing Design Methodology Yields Efficient Enhanced Production Performance in the South Sulige Field

机译:完整的优化压裂设计方法在南苏丽域内产生高效增强的生产性能

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A joint venture project in the South Sulige gas field began in 2011 with the intent of developing efficient production in the field. The South Sulige gas field has two main producing formations, both with low permeability and porosity. Like many other tight gas sandstone formations in China, fracturing is necessary in order to get economic production in pad-drilling To date, five wells horizontal and 60 vertical wells have been stimulated in the South Sulige field in this project including four vertical wells from an earlier campaign in 2008. The 2008 campaign had nearly 40% rate of premature screenouts and the first two wells in 2011 also experienced screenouts. Tracing the root of the problem to natural fissures in the formation, mitigation was taken that led to the elimination of premature screenouts since implementation. Post-frac well performances of the new wells have far exceeded production of wells previously drilled in the South Sulige field in 2008. This significant increase can be traced to a complete fracturing methodology that optimizes every step of fracturing design and execution. The use of specialized multi-stage completions in the horizontal and vertical wells allows the operator to efficiently execute fracturing jobs while also minimizing downtime before flowback, cleanup, and ultimately production. Optimized fracturing designs minimize excessive height growth seen in previous work done in the field along with a new design workflow raise the potential production possible. The fluid design allows for rapid flowback and clean-up to minimize fracturing polymer formation damage. It also contains specific mitigation measures to combat the natural fissures observed in the formations throughout the field. This paper will discuss the overall enhanced performance achieved through optimization of the fracturing work flow. The discussion will mainly focus on the different completion designs utilized for efficicent multi-stage fracturing in the horizontal and vertical wells, the optimized fracturing stimulation design and new design workflow, clean-up procedures to minimize formation damage, and mitigation of the natural fractures that are abundant in the formations of the South Sulige field.
机译:南苏里南苏里昂气田的合资项目始于2011年,意图在该领域开发有效的生产。南苏丽格气田有两个主要的生产形成,既具有低渗透性和孔隙率。与中国的许多其他紧汽砂岩形成一样,为了迄今为止在垫钻井中获得经济生产,将在该项目的南苏里格田中刺激了五大井水平和60个垂直井的压裂,包括四个垂直井早期的竞选2008年。2008年的运动率近40%的早产筛选率和2011年的前两个井也经历过屏幕外。将问题的根源追溯到地层中的自然裂缝,从实施以来,减轻了消除早产的筛选。 FRAC井的新井的表现远远超过2008年南苏里梅地区钻井的井生产。这一显着的增加可以追溯到完整的压裂方法,这些方法可以优化压裂设计和执行的每一步。在水平和垂直井中使用专业的多级完成允许操作员有效地执行压裂工作,同时在流量,清理和最终生产之前最小化停机时间。优化的压裂设计最大限度地减少了在现场完成的过度高度增长以及新的设计工作流程,提高了可能的潜在生产。流体设计允许快速回流和清洁,以最小化压裂聚合物形成损坏。它还含有特定的缓解措施,以打击整个领域中地层观察到的自然裂缝。本文将讨论通过优化压裂工作流程实现的整体增强性能。讨论主要关注在水平和垂直井中采用效率的多阶段压裂的不同完成设计,优化的压裂刺激设计和新的设计工作流程,清理程序,以最大限度地减少形成损伤,以及减轻自然骨折的缓解在南苏里梅田的地层中丰富。

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