A Typical Case Analysis of Gas Drilling for Efficient Development of Tight Sandstone Gas Reservoirs
Currently,the efficient establishment of production in tight sandstone gas reservoirs through gas drill-ing is constrained by various factors,and the unclear production mechanism hinders the technical advantages of gas drilling.Therefore,selecting typical high-yielding wells in the Dibei and Western Sichuan areas as research subjects,a comprehensive analysis of drilling data was conducted to explore the common characteristics of effi-cient production establishment.The study found that the well depth of the gas production points is highly correla-ted with the sandstone and mudstone lithological interfaces,confirming that the fracture network system devel-oped at the lithological interfaces is a favorable permeability channel.In water-rich tight gas reservoirs affected by fault zones,there is a high probability of formation water enrichment in the upper part of the fault's downthrown side.Wells deployed on the upthrown side of the fault have a lower degree of water production,and the presence of fractures at the lithological interfaces enables simultaneous and stable gas and water production.The analysis suggests that well site deployment should be based on structural high positions and the upthrown side of faults to ensure gas source enrichment while avoiding sudden water influx.The well trajectory should target fractures at li-thological interfaces,and the upper well section should avoid completely sealing the target mudstone layers with casing,to fully release the gas production potential of the fractures at the lithological interfaces.Future efforts should also focus on strengthening technical breakthroughs to enhance the capability of gas drilling through com-plex interbedded sandstone and mudstone.
tight sandstone gas reservoirgas drillinglithological interface fracturewellbore deployment
NETL
NSTL
万方数据
维普
