Abstract: During the process of Weizhou12-1B Oilfield well drilling,downhole instance is complexity,and drilling time is longer,so drilling riser pipe has to have a good depth stability.In order to insure riser pipe stabilization during the process of drilling and oil and gas production later,it is necessary that making a study on a reasonable the mininum driving of riser pipe depth in this Oilfield.According to engineering and geologic evaluation of sea floor, combine with the requirements of field measures of drilling riser pipe and different work situations,by riser pipe limit resistance to pressure analytical method,calculating result showed the reasonable mininum driving depth of riser pipe.Field practices show that the calculating results met the real conditions perfectly.