The study on supplementary technology for Da Zhangtuo gas-condensate reservoir underground Ggs store

Underground gas storage as an important part of the large-scale natural gas gathering project, reduce investment to optimize the function of gathering and transportation system, regulating the gas market peaks and valleys of the summer and winter seasons, protect the user's needs, are an irreplaceable important role. Since the completion of the first underground gas storage in Canada in 1915, to the end of 1999, have been completed and 542 various types of underground gas storage working gas capacity of 241.8 billion cubic meters. With the rapid development of the economic situation in Beijing, Tianjin, and construction of a large underground gas storage is particularly urgent and necessary. - Large sheet of lump large underground gas storage more than 5 million cubic meters of the date of the paper that is built to meet the Beijing-Tianjin region peaking gas condensate gas reservoir gas storage library supporting technology. The main contents include: First, the use of logging constrained inversion to reservoir lateral prediction of advanced technology, comprehensive study of the large amounts of data in 2D and 3D seismic, well logging, drilling, and indoor experiments, the implementation of the gas tanks for a nose like structure pinchout fault seal and sandstone formation faults lithologic traps. The faults CAPROCK strong sands connectivity. By to develop dynamic gas storage Dazhangtuo Research and the indoor the fluid experiment data analysis, summarize the high saturation, high oil content, high anti-condensate amount of hydrocarbon characteristics, the possibility of the existence of the oil ring identified The abandonment pressure gas storage 10Mpa. Third, using the volumetric method, calculation and evaluation of the material balance method, the voltage drop method to determine the Dazhangtuo gas condensate reservoir reserves of 15.5 × 10 to 8m ~~ 3; Fourth, the use of the material balance, the numerical simulation of special technology, gas storage the library capacity, working gas and other gas storage characteristic parameter optimization study design; five is the use of nodal analysis method of injection wells, mining wells of injection and production capacity carried out the optimal design; Sixth, according to the daily gas production 500 × 10 ~ 4m ~ 3 / d index requirements, design the gas library seasonal peaking gas production period of 120 days, the gas injection period of 220 days, first adopted after the injection, gas libraries pressure 15-29MPa, single-well gas production 35 × 10 ~~ 4m ~~ 3 / d, single-well injection gas 40 × 10 ~ 4m ~ 3 / d of gas storage operation indicators; seven using numerical simulation methods to optimize the design of the 16 wells of the eight wells gas injection gas production in the higher parts of the gas injection embodiment ; eight is developed according to the characteristics of the underground gas storage monitoring the content of the various stages of the construction and operation of gas storage; nine design the twelve injection and production wells geological design program. After on-site implementation, large sheets of snake underground gas storage design achieved drilling success rate of 100%, single-well injection-production capacity in line with the rate of 100%, gas storage operation indicators meet the quality level of 100%. The program is China's first large-scale underground gas storage design.