四川盆地罗家寨高含硫气田安全高效开发与长期稳产关键技术  

Key technologies for safe and efficient development and long-term stable production of the Luojiazhai high-sulfur gas field in the Sichuan Basin

作　　者：葛枫 贾长青 李宏 GE Feng;JIA Changqing;LI Hong(CDB Operating Company,PetroChina Southwest Oil&Gasfield Company,Chengdu,Sichuan 610051,China)

机构地区：[1]中国石油西南油气田公司川东北作业分公司,四川省成都市610051

出　　处：《天然气工业》2023年第9期85-92,共8页Natural Gas Industry

摘　　要：罗家寨气田飞仙关组气藏是中国石油在四川盆地储量规模最大、丰度最高的高含硫气藏,自2008年以来,随着开发阶段的不断深入,气藏安全高效开发面临长期稳产的严峻挑战。为保障高含硫气藏的长期稳产,从全生命周期角度系统分析了优质储层准确识别难、硫沉积影响全生命周期产能评价和产能维护难,以及复杂地理和人居环境下硫化氢(H_(2)S)泄漏预警监测难的“三难”问题,并通过地质、工程等多专业联合攻关,创新形成了高含硫天然气开发关键技术。研究结果表明:①解决了低品质地震资料成像、多期滩体叠置与多尺度裂缝发育背景下优质储层预测难的问题,形成了高陡复杂构造高含硫鲕滩气藏超高产井精细培育技术,优质储层预测符合率从70%提高到85%,平均单井无阻流量由293.4×10^(4)m^(3)/d提升至794.3×10^(4)m^(3)/d,确保了超高产井部署的效果,实现了高产;②研发了高含硫气藏高效溶硫产品,解决了元素硫沉积机理及硫沉积影响的生产特征不明确问题,支撑了硫沉积影响的全局智能优化高效决策,形成了硫沉积气藏全生命周期智能优化稳产技术,气藏以900×10^(4)m^(3)/d规模连续稳产6年以上,实现了长期稳产;③解决了国内高含硫气田避难风险评估技术缺乏,以及硫化氢泄漏后大规模避难安全保障等难题,形成了高含硫气田泄漏预警及公众防护技术,气藏已连续安全生产超2500天,实现了安全生产。结论认为,长期稳产关键技术的形成有力支撑了罗家寨高含硫气田“少井高产、长期稳产、安全生产”的重大开发成效,可以为国内外同类型气藏提供有益的借鉴。The Feixianguan Formation gas reservoir in the Luojiazhai Gas Field is PetroChina's high-sulfur gas reservoir with the largest reserves and the highest abundance in the Sichuan Basin.With the continuous advancement of its development,its safe and efficient development has faced severe challenges in long-term stable production since 2008.In order to ensure the long-term stable production of high-sulfur gas reservoirs,this paper systematically analyzes"three difficulties"in the accurate identification of high-quality reservoirs,the whole-life-cycle productivity evaluation and maintenance under the influence of sulfur deposition,and the prewarning and monitoring of hydrogen sulfide(H_(2)S)leakage under complex geographical and living environments from the perspective of whole life cycle.In addition,the key technologies for the development of high-sulfur natural gas are innovatively developed by means of multiple-discipline research including geology and engineering.And the following research results are obtained.First,the difficulties in predicting high-quality reservoirs under the background of low-quality seismic imaging,multiple-stage shoal superposition and multi-scale fracture development are solved,and the technologies in precisely cultivating super high-yield wells in high-sulfur oolitic shoal gas reservoirs with complex and steep structures are developed,which increases the prediction coincidence rate of high-quality reservoirs from 70%to 85%and the average absolute open flow(AOF)per well from 293.4×10^(4)m^(3)/d to 794.3×10^(4)m^(3)/d,ensures the deployment effect of super high-yield wells,and achieves a high production rate.Second,an efficient sulfur dissolution product for high-sulfur gas reservoirs is researched and developed,and the depositional mechanisms of elemental sulfur and the production characteristics under the influence of sulfur deposition are clarified,which supports global,intelligent,optimized and efficient decision-making under the influence of sulfur deposition.In addition,the intellig

关 键 词：四川盆地 罗家寨气田 飞仙关组气藏 高含硫 安全高效开发 长期稳产 

分 类 号：TE37[石油与天然气工程—油气田开发工程]