摘要
四川盆地元坝气田长兴组气藏为高含硫生物礁底水气藏,具有礁体多期叠置发育、储层非均质性强、气水关系复杂的特征,开发初期部分气井底水锥进迅速,产量、压力下降快,预测天然气稳产期短,且存在部分小礁体储量动用不充分等问题。为实现气井见水时间预测与防控、剩余气精准高效挖潜、压降控制和硫堵防治,梳理了气田开发过程中形成的复杂生物礁底水气藏控水稳气、剩余气高效动用及保压稳产等系列气藏持续高产稳产关键技术,并提出了气藏持续稳产的攻关技术方向。研究结果表明:①控水稳气技术可实现产水井采侵平衡和水气比总体稳定,可有效提高气藏开发效果;②剩余气高效动用技术可对剩余气进行精细描述和潜力评价,实现了调整井的高产高效,夯实气藏稳产基础;③保压稳产配套技术可有效控制气藏压降速率,保障了气田长期稳定生产;④综合应用上述多项技术,元坝气田高产稳产年限由方案设计的6年延长至9.7年,气藏采收率提高了12.8%,持续稳产效果显著。结论认为,该技术能够有效解决储层高含硫、强非均质性、气水关系复杂、底水锥进迅速、剩余气区礁体分布“小、散、薄、深”、压降速率过快和井筒硫沉积等方面的难题,对实现同类气田长期高效开发具有借鉴意义。
Changxing Formation gas reservoir in the Yuanba Gas Field of the Sichuan Basin is a high-sulfur bioherm gas reservoir with bottom water,where the reefs of multiple stages are stacked,the reservoirs are strongly heterogeneous,and the gas-water relationships are complicated.In the early stage of its development,some gas wells suffer rapid bottom water coning,resulting in a rapid decline in production and pressure,so the stable natural gas production period is predicted to be short.In addition,the reserves in some small reefs are not fully exploited.In order to realize the prediction and control of water breakthrough time in gas wells,the precise and efficient tapping of remaining gas potential,the pressure drop control,and the sulfur blockage prevention and control,a series of key technologies for sustaining the high production of the gas reservoir is developed in the process of gas field development,such as the water production control and gas production stabilization technology for complex bioherm gas reservoirs with bottom water,the efficient remaining gas utilization technology,and the pressure maintenance and production stabilization technology.In addition,the technological research direction for the sustainable production of the gas reservoir is pointed out.And the following research results are obtained.First,the water production control and gas production stabilization technology can achieve the balanced production and invasion in water-production gas wells and the overall stability of water/gas ratio,so as to improve the development effect of the gas reservoir effectively.Second,the efficient remaining gas utilization technology can provide a fine description and potential evaluation of remaining gas,so as to ensure the high production and efficiency of adjustment wells and lay a solid foundation for the stable production of the gas reservoir.Third,the pressure maintenance and production stabilization supporting technology can effectively maintain the pressure drop rate of the gas reservoir,so as to ensure a long-term stable production of the gas field.Fourth,based on the comprehensive application of the above mentioned technologies in the Yuanba Gas Field,a planned high and stable production period is extended from 6 years to 9.7 years,and the recovery factor of the gas reservoir is increased by 12.8%,indicating remarkable effects in sustainable and stable production.In conclusion,these technologies can effectively solve the problems of high sulfur,strong heterogeneity,complex gas-water relationship,rapid bottom water coning,"small,scattered,thin and deep"distribution of reefs in the remaining gas zone,high pressure drop rate,and sulfur deposition in the wellbore,which is of reference significance to the long-term efficient development of similar gas fields.
作者
郭彤楼
王勇飞
柯光明
GUO Tonglou;WANG Yongfei;KE Guangming(Sinopec Southwest Oil&Gas Company,Chengdu,Sichuan 610041,China)
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2023年第9期93-101,共9页
Natural Gas Industry
基金
中国石化科技部重点项目“高含硫复杂生物礁底水气藏稳产关键技术研究”(编号:P21025)。
关键词
元坝气田
长兴组
生物礁底水气藏
多期叠置礁体
控水稳气
剩余气动用
保压稳产
硫堵
Yuanba Gas Field
Changxing
Bioherm gas reservoir with bottom water
Stack of multiphase reefs
Water production control and gas production stabilization
Remaining gas exploitation
Pressure maintenance and production stabilization
Sulfur blockage
