长宁页岩气井柱塞气举工艺规模化应用及效果分析

Large-Scale Application and Effect Analysis of Plunger Gas Lift Technology in Changning Shale Gas Reservoir

常规气井柱塞气举工艺在页岩气井应用中存在大斜度井段液相漏失明显、钢丝作业风险高、柱塞与地面增压协同运行难等问题。为优化柱塞气举工艺的运行效果,通过对页岩气井的精细化柱塞工艺设计,规范排液位置、配套工具选型、柱塞介入时机、平台柱塞错峰运行等措施,为工艺规模化应用提供了技术支撑。结果表明,55~65°井斜角的井深是柱塞排液的较优深度,通过优选“带单流阀卡定器+柱状柱塞”工具组合,在气井产量接近1.2倍临界携液量时以平台错峰制度运行柱塞,可实现页岩气井柱塞气举工艺的正常运行;构建的柱塞气举工艺远程智能管理系统实现了对柱塞运行状态的实时监测、异常工况诊断与远程处理,大幅提升柱塞气举工艺管控效率;精细化设计与平台化管控相结合使页岩气柱塞气举工艺发挥短期增产、长期稳产的效果,具备了规模化应用条件,并取得了良好应用效果。该模式可推广应用于气举、泡沫排水等工艺,实现多类排采工艺的规模化、精细化应用。

In shale gas wells,the application of conventional gas well plunger gas lift technology may lead to many problems,such as obvious liquid phase leakage in highly deviated well sections,high risk of wire operation,and difficulty in coordinated operation of plunger and surface pressurization.In order to optimize the operation effect of the plunger gas lift process,through the refined plunger process design of shale gas wells,the measures such as liquid discharge position,matching tool selection,plunger intervention timing,platform plunger stagger operation,etc.are standardized,providing technical support for the large-scale application of the process.The results show that:The 55~65°well deviation angle is the optimal depth for the plunger to drain liquid.By optimizing the tool combination"with single flow valve detent+cylindrical plunger",when the gas well production is close to 1.2 times the critical liquid carrying capacity,the plunger is operated under the platform peak shifting system,and the normal operation of the plunger gas lift process in shale gas wells can be achieved.The remote intelligent management system for plunger gas lift process constructed has achieved real-time monitoring of plunger operation status,diagnosis of abnormal working conditions,and remote processing,greatly improving the efficiency of plunger gas lift process control.The combination of fine design and platform based management and control has enabled the shale gas plunger gas lift process to achieve short-term production increase and long-term stable production,which has provided conditions for large-scale application and achieved good application results.This mode can be popularized and applied to gas lift,foam drainage and other processes to achieve large-scale and refined application of multiple drainage and production processes.