Abstract
This study deals with the laboratory test results on the application of a dope-free connection (DFC) to a steam injection well, and the running results in the actual well.
A mechanical shock test, thermal shock test, and make-and-break (M&B) test were performed to evaluate the durability and the galling resistance of DFC with the new surface treatment. In addition, the effect of coating damage on the connection performance has been investigated. Under the predicted loading conditions, the connection performance was evaluated. The connections were used in steam assisted gravity drains (SAGD).
As the results of the test, it was found that DFC have enough galling resistance at an extremely low temperature and after a thermal shock was applied thereto. The galling resistance was not degraded in the case of a connection having a solid lubricant with coating damage. The joint strength and the gas tightness were maintained under repeated tensile and compressive loads at an elevated temperature. In the field usage, all connections were made-up without any thread compound grease (TCG), so that their running efficiency could be improved.
In conclusion, it is apparent from the results of the tests that DFC can endure field application. DFC not only eliminates the environmental problems caused by TCG, but also has some potential for saving running time.
