低渗火山岩气藏全周期产能评价方法  

Full-Cycle Productivity Evaluation in Low-Permeability Volcanic Gas Reservoir

作　　者：陈超[1] 王彬[1] 李道清[1] 苏航[1] 鲍颖俊 Chen Chao;Wang Bin;Li Daoqing;Su Hang;Bao Yingjun(PetroChina Xinjiang Oilfield Company, Karamay, Xinfiang 834000, Chin)

机构地区：[1]中国石油新疆油田分公司,新疆克拉玛依834000

出　　处：《特种油气藏》2018年第2期90-94,共5页Special Oil & Gas Reservoirs

基　　金：国家科技重大专项"复杂气藏有效开发及稳产关键技术研究与应用"(2017E-04-10)

摘　　要：受火山喷发多期性影响,火山岩气藏岩性变化较快,渗透率低,且平面非均质性强,造成气井产能差异较大。为延长气井稳产周期、降低水侵风险以及提高气藏最终采出程度,提出一种火山岩气藏全周期产能评价方法。该方法贯穿气井试气、试采、稳产降压、稳压降产4个阶段,通过优选试气评价和井底压力折算方法,以气井动态储量为基础,建立一套低渗火山岩气藏全周期动态理论模型,将气井实际生产分为降压稳产型、降压降产型、持续间开型以及水淹补层型4种类型,并依据政策界限进行生产预测。实践表明,该方法突破了采用无阻流量对火山岩气藏单一配产的局限性,不仅实现了对低渗火山岩气藏合理产能的定量评价,而且能够实现对压力的准确预测,为指导火山岩气藏稳产、配产提供了理论基础与技术方法。Volcanic gas reservoir is featured by great lithology variation, low-permeability and strong areal hetero- geneity, which results in large differences in gas well productivity. A full-cycle productivity evaluation method is proposed to prolong the stable production of gas well, reduce water invasion risk and enhance the ultimate recovery＂ factor. This productivity evaluation involves in 4 stages, including well gas test, production test, production mainte- nance by pressure release and pressure maintenance by rate release. Based un the optimizatiun of gas test evaluation and bottom-hole pressure calculation methods, a full-cycle dynamic model for low-permeability volcanic gas reser- voir is established according to the gas well dynamic reserve. Field gas wells are classified as production maiute- nance by pressure release, production-pressure decline, continuous intermittent production and tlooding well with extra perforation, and production forecast is performed based on policy boundaries. Practice shows that this method improves the limitation of production allocation only by absolute open flow for volcanic gas reservoir. It can not only obtain the quantitative evaluation of low-permeability volcanic gas reservoir productivity, but also accurately predict reservoir pressure, which could provide certain theoretical basis and technical method for the production mainte- nance and allocation in volcanic gas reservoir.

关 键 词：低渗火山岩 产能评价 全周期 动态储量 稳产期限 

分 类 号：TE32[石油与天然气工程—油气田开发工程]