HORIZONTAL DRILLING TECHNOLOGY OF TWO-STAGE IN DEEP THIN RESERVOIR

It is very difficult to develop the deep thin reservoirs using the conventional horizontal drilling technology.A two-stage horizontal well HD1-27H,located in Harderson area of Xinjiang and drilled in the thin reservoirs was presented,focusing on its design and operation.The target radius designed for the two horizontal sections was only 0.5m,while the logging interpretation length should not be shorter than 75% of the designed horizontal length,thus the requirement on target hitting accuracy was very high and well trajectory control was very difficult.Taking advantage of the associated technologies,using small degree single-bend motor and combining with MWD steerable drilling,the well trajectory was accurately controlled,the error of actual trajectory was controlled within 0.5m,and the logging interpretation showed a reservoir penetration rate of 100%,which set a new record.