在Mishmish区块,油藏埋藏相对较深,地层压力高,中上部地层软硬交错,缩径严重,容易导致卡钻的严重后果,所以必须采用高密度来平衡地层压力,确保安全钻进。但是,在高密度条件下,机械钻速相对较低,容易发生井漏、卡钻等复杂事故,导致钻井周期延长,研究高密度条件下提高钻进速度有较重要的现实意义。 In the Mishmish block, the reservoir is relatively deep buried, the formation pressure is high, the middle and upper formations are staggered hard and soft, and the diameter of the middle strata is serious, leading to serious consequences of stuck pipe. Therefore, high density must be used to balance the formation pressure to ensure safe drilling. However, under high-density conditions, the ROP is relatively low, which is prone to complicated accidents such as lost circulation and stuck pipe, resulting in prolonged drilling cycles. It is of more practical significance to study how to improve the drilling speed under high-density conditions.