中国首例裂缝型高压地下储气库建库参数设计及注采实践
Construction parameter design and injection-production practice of China's first fractured high-pressure UGS
刘斐 1刘晓旭1
作者信息
- 1. 中国石油西南油气田公司勘探开发研究院 四川 成都 610041
- 折叠
摘要
为了解决裂缝型超高压气藏(川东断褶带铜锣峡构造二叠系上统长兴组气藏)枯竭后改建为高压地下储气库的参数设计难题,依据气藏地质及开发特征,采用静、动态综合分析方法,制订并按照"优选区间、高效注采、保障应急、分步实施"的总体设计思路,基于不同裂缝分布模式下单井注采能力评价及不同压力区间内工作气量与井数交互设计,开展上限压力、注采井数、注采气量等建库关键参数设计研究,并通过建库先导试验及注采实践,深化建库地质及工程认识,优化参数.研究结果表明:①不同裂缝发育特征下的单井产能差异较大,可将不同条件下生产模拟得到的合理产量平均值作为新井设计注采气量——新井设计采气量为5.6×104～268.5×104 m3/d,新井合理注气量为69.7×104～214.2×104 m3/d;②完成周期注采任务需要上限压力大于38 MPa、井数至少为9口,结合地面条件及数值模拟结果,最终确定设计上限压力为40 MPa,设计库容为13.8×108 m3,工作气量为9.2×108 m3,垫底气量为4.6×108 m3,日均注气量为460×104 m3,日均采气量为766×104 m3;③考虑建库区域地面条件共部署3座注采平台,地下沿36号断裂带上的裂缝发育部位共部署注采井9口;④随着新部署井的投产及注气量的增加,该储气库的工作气量和库容逐渐达标,表明增加井数是提升储集空间的有效途径;⑤2024年12月15日,铜锣峡储气库项目主体完工,投入采气,目前运行良好.结论认为,裂缝型超高压气藏枯竭后改建为高压储气库是可行的,铜锣峡储气库作为中国首个成功案例,在建库参数设计及运行实践方面具有示范借鉴意义.
Abstract
Converting a depleted fractured ultra-high-pressure gas reservoir of Upper Permian Changxing Formation in the Tongluoxia structure of eastern Sichuan Basin fault-fold belt into a high-pressure underground gas storage(UGS)presents parameter design challenges.In this paper,the key parameters of UGS construction such as upper limit pressure,injection-production well number,and gas injection-production rate were designed using an integrated static-dynamic analysis method,based on the geological and development characteristics,as well as the evaluation of single-well injection-production capacity under different fracture distribution patterns,and the interaction design of working gas volume in different pressure intervals and number of wells,following the design strategy of"optimal interval selection,efficient injection and production,emergency support,and phased implementation".In addition,the geological and engineering understanding of UGS construction was deepened,and the parameters were optimized through pilot trials and injection-production practice.Research results are shown as follows:(i)Single-well productivity varies significantly depending on fracture development characteristics,and the simulated average rational production rates under different conditions can be used as the designed gas injection-production rates of new wells,i.e.,5.6×104-268.5×104 m3/d as the production rates and 69.7×104-214.2×104 m3/d as the injection rates.(ii)To complete the cyclical injection-production tasks,nine wells are needed with an upper limit pressure greater than 38 MPa.Considering surface conditions and numerical simulation results,the final design parameters are set as upper limit pressure of 40 MPa,storage capacity of 13.8×108 m3,working gas volume of 9.2×108 m3,cushion gas volume of 4.6×108 m3,average daily gas injection rate of 460×104 m3,and average daily gas production rate of 766×104 m3.(iii)In view of the surface conditions of the construction site,three injection-production platforms are deployed,and nine injection-production wells are arranged along the fracture-developed part of No.36 fault zone.(iv)As the newly deployed wells are put into production and the gas injection volume is increased,the working gas volume and storage capacity of the UGS reach the expectations gradually,indicating that increasing the number of wells is an effective way to enlarge storage space.(v)The Tongluoxia UGS project was completed and put into production on December 15,2024,and is currently in good operation.In conclusion,it is feasible to convert a depleted fractured ultra-high-pressure gas reservoir into a high-pressure UGS.The Tongluoxia UGS,as China's first successful case,provides a reference for UGS construction parameter design and operation.
关键词
裂缝型气藏/超高压气藏/铜锣峡地下储气库/高压储气库/建库参数设计/合理产量/上限压力/注采井数Key words
Fractured gas reservoir/Ultra-high-pressure gas reservoir/Tongluoxia UGS/High-pressure UGS/UGS construction parameter design/Rational production rate/Upper limit pressure/Injection-production well number引用本文复制引用
出版年
2025
NETL
NSTL
万方数据