After more than 50 years of exploration and development

W gas field in Sichuan Basin is faced with large remaining geological reserves and great development potential. However

the overall water production of the gas reservoir

the subsequent effective development of the gas reservoir is restricted

resulting in the current recovery degree of only 36.6 %. In order to maximize the remaining potential of the gas reservoir and improve the final recovery of the gas reservo

ir

Come up with the idea of "looking for gas with water and turning waste into treasure"

systematically combs the natural gas and formation water components of Sinian gas reservoir

extract helium for natural gas components

extract precious metal ions from formation water

and comprehensively utilize heat energy

so as to realize the overall effective utilization of gas reservoir. The results show that: ① The helium content of natural gas in W gas field accounts for 0.2 %~0.35 %

which is 4~7 times of the helium industrial production limit （0.05 %）

and the helium reserve is about 0.8×10

8

m

3

. The scale of helium resources is very considerable. helium resource scale is very considerable

and it is one of the large helium rich gas fields in China. ② The gas field water is rich in lithium

bromine and other trace element resources

in which the lithium content is 2~3 times the industrial exploitation value and the bromine content is 2~4 times that of the industrial exploitation value. ③ The temperature of gas field water can reach 90 ℃

and it is calculated as 5 000 m3/d

the annual available heat is 3.47×10

11

kJ

which can be saving 1.18×10

4

t of standard coal. Through the analysis of comprehensive utilization examples of Sinian gas reservoir in W gas field

combined with the effective development and utilization of new energy

it provides a new idea for the enhanced oil recovery and potential analysis of other gas fields in the later stage of development.