Presenter
Chee Kong Chen from Baker Hughes
Abstract
Often, operators conduct various well entries in a well for various purposes, like replace valves or setting plug. These well entries present opportunity for data collection for better well surveillance.
In this case history, we present a case where a multifingers-caliper tool (MFC) was run to understand tubing integrity during a DSIV replacement operation in a water injector for a UK North Sea operator. While the MFC data did not show significant integrity issue for majority of the tubing, a closer examination of the temperature data showed unusual temperature trend around the WEG of the tubing.
A further discussion and analysis indicate there could be crossflow between reservoir zone and overburden zone, which were about 7,000 ft apart. A further production logging (PLT) survey was planned to confirm the crossflow/leaks and injection profile. The survey confirmed presence of significant crossflow and showed majority of injection water went into overburden zone.
The result prompted the operator to stop the water injection and immediate action to isolate the crossflow.
This case history shows the importance of well surveillance, and petrophysicist should take every effort to investigate various acquired data. As in this case temperature survey is not normally an objective of MFC survey, but the data revealed an unexpected issue in the well.
Biography
Chee Kong Chen is a Senior Cased Hole Geoscientist in Baker Hughes, based in Aberdeen, UK. Chee Kong has 18 years of experience in open hole and cased hole interpretation. Starting his careers with Shell in Malaysia, he has since worked with several operators and service companies in Africa and North Sea. Currently he mainly working on cased hole data supporting well intervention and P&A activities.