Real-time early warning of pipe sticking based on abnormal diagnosis of engineering parameter change trend

Abstract:

South Sichuan work area is a key shale gas exploration and development area of Sinopec. The high formation pressure coefficient and harsh drilling geological conditions in this work area lead to complex drilling and frequent failures， among which sticking fault is the most prominent which seriously restricts the safe and efficient development of shale gas in South Sichuan. There are some problems in the existing technology， such as poor comprehensive utilization of monitoring information， not timely risk warning and strong subjectivity. In this paper， through the analysis of the expert knowledge judgment of sticking fault in the drilling process， the key characterization parameters corresponding to the risk of sticking are determined， the change trend of the key characterization parameters at the location of sticking is studied and the corresponding change rules are obtained. On this basis， a real-time early warning method for sticking fault based on abnormal diagnosis of engineering parameter change trend is established. Well WY-XX is selected as an example for analysis， as a result， the warning results by this software is consistent with the actual downhole risk which verified the correctness and reliability of the model with the success rate of 83%.

Key words:shale gas exploration and development;sticking;risk early warning;real-time warning;VDX parameterinstrument;South Sichuan work area