Abstract: TS1 well designed deepth is 8000m.It is complicated the formation of oil reservir rock.In order to complete successfully,Running in ?311.15 mm hole with ?273.05 mm casing is take room for unforecasting complication procedure drilling hole in TS1 well.It is difficulty running hole with high stiff and small room and great weight casing.It is a good drilling technology plan in order to decrease prevention strength and make hole not forbidding procedure running in hole with casing through choosing drilling tool assemble,checking and controlling drilling quality and controlling drill attending amount and mud character and ability for make hole wall stability,and trimming hole basis on wireline logging and making safely provision method during the procedure of running in hole with casing.It achieve a contrivance of crease a grade hole diameter through unorthodox casing and take room and make foundation for unforecasting complication procedure drilling hole lately.It make a invaluable experience for other extremly deep well in order to crease hole diameter grade.