| 摘要 |
The invention relates to a method for early detection of a wellbore influx using at least a first pressure transmitter (P1) arranged in a first position in the well and a second pressure transmitter (P2) arranged in a second position in the well, the at least first and second pressure transmitters (P1, P2) being arranged in a fixed vertical distance in relation to each other, the method comprising the steps: A) calculating an expected density of a return flow between the at least first and second pressure transmitters (P1, P2) by measuring or predicting mud or sacrificial fluids density, rock density, flow rate (Q), true vertical depth (TVD), rate of penetration (ROP) and wellbore diameter, B) continuous measuring of the actual density of a return flow based on a measured pressure at each of the at least first and second pressure transmitters (P1, P2), the actual density being computed based on vertical distance (h) between the first and second pressure transmitters (P1, P2) and adjusted for frictional pressure drop between each of the at least first and second pressure transmitters (P1, P2) based on direction and the flow rate (Q) in annulus, C) comparing the calculated expected return flow density and the measured actual return flow density to determine a wellbore influx. D) using at least a first temperature transmitter (T1) arranged in a section of the well adjacent the at least first and/or second pressure transmitter (P1, P2), measuring the temperature at the at least first temperature transmitter (T1), and using said temperature together with the measurements from the first and second pressure transmitters (P1, P2) to predict the probability of hydrates forming in the well. |
