Key technological innovation and successful practice in safe and highly-efficient development of ultra-high sulfur monoblock gas fields in the Sichuan Basin
In June 2023,PetroChina's first independently developed ultra-high sulfur gas field,namely TSP Gas Field,reached the expected production rate,which marks a new milestone in the leapfrog development of ultra-high sulfur gas fields in China.The DKH-QLB ultra-high sulfur gas field is currently in comprehensive construction,ushering a new stage in the exploration and development of ultra-high sulfur gas fields in the Sichuan Basin.In order to achieve safe,clean,and efficient development of ultra-high sulfur gas reservoirs,PetroChina Southwest Oil & Gasfield Company adheres to independent innovation,and targeting at the productivity construction of TSP and DKH-QLB gasfields,continuously explores and practices in high-efficiency and high-yield development,ground gathering and treatment,natural gas purification,corrosion control,QSHE and digital construction of ultra-high sulfur gas fields.New breakthroughs are realized in key core technologies for the development of ultra-high sulfur gas fields in China.The following research results are obtained.First,the development of the high-precision seismic imaging and stratigraphic model reconstruction techniques for highly steep structures achieves the structural pattern restoration of 60° steep-dip formations,and the established high-yield well deployment model is verified in development well to achieve high natural gas production of one million cubic meters.Second,the development of"evaluation-design-control"integrated well control technology,optimized fast drilling and completion technologies for complex geological setting key supporting technologies for high-yield high-benefit well construction,and full-life-cycle well integrity guarantee technologies ensure the safe and efficient construction of well engineering in ultra-high sulfur gas fields.Third,the establishment of surface engineering technology system for ultra-high sulfur gas fields,including gas-liquid mixed/split transportation processes.material selection and corrosion inhibitors,in-depth sulfide removal and ultra-low tail gas emission.construction quality control,multiple interlocking protection and multi-level emergency truncation,ensures the corrosion control and safe,efficient and stable operation of the surface system.Fourth,the establishment of the strictest safety protection distance and emergency control system for ultra-high sulfur gas fields in China,and the development of the flash steam pressurized sulfur-containing gas field water recovery technology achieve the zero emission of station flash steam,and ensure the safe,clean,and efficient development of ultra-high sulfur gas fields.Fifth,the development of the reservoir-wellbore-surface elemental sulfur deposition prediction and prevention technology achieves the effective prediction of reservoir-wellbore-surface elemental sulfur deposition,solves the problem of elemental sulfur deposition blockage,and supports the long-term stable production of ultra-high sulfur gas fields.Sixth,the optimization of digital delivery standards,the creation of digital twin for the entire production system,the establishment of integrated modeling and multi-scenario intelligent work flow including the upstream and downstream of development and production,and the construction of intelligent management platform improve the control capabilities and work efficiency in the development and production of ultra-high sulfur gas fields.In conclusion,The key technological innovation in the independent development of ultra-high sulfur monoblock gas fields supports the productivity construction of TSP,DKH-QLB and other gas ultra-high sulfur gas fields in the Sichuan Basin,provides reference for the safe,clean and efficient development of ultra-high sulfur gas reservoirs in China,and makes a great contribution to guarantee national energy safety.
Sichuan BasinUltra-high sulfur gas reservoirTSP Gas FieldDKH-QLB Gas FieldSafe,clean and efficientIntelligent gas field
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