In order to improve the efficiency of the heavy oil thermal recovery in high temperature and high pressure conditions, a new transformation joint was designed based on the theory of fluid pressure difference. Through the automatic displacement of a one-way valve and a seal tongue under the action of pressure difference, it realized intelligent transformation between the production status and the well testing status. According to the oil recovery requirements about structure size, energy loss, high temperature sealing property and high temperature resistance, thermal expansion of material, designs about structure, key sizes, material model and sealing parts were carried out, and strength of key parts was verified theoretically. Fluent was used to simulate the internal flows of the structure, to analyze and verify the energy loss under the working status. The result shows that the product can meet the requirements of heavy oil exploitation, and its simple structure, high reliability and strong durability can greatly improve the efficiency of crude oil recovery.

In order to intelligently switch the working status of production string between oil production and testing in the heavy oil thermal recovery, as well as to improve oil exploit efficiency and reduce the exploitation cost, a new transformation joint was designed. Based on the hydraulic fluid controlling principle, caused by the one-way valve opening and closing, the positive and reverse pressure pushed the sealing cylinder to the left or the right. And the transformation between the two states could be achieved. The K-ε model of CFX software was used to simulate the internal flow field of the device under four different opening status of the one-way valve. By analyzing the distributions of pressure and velocity, the energy loss of the device in the oil state was gotten, and the method were found to optimize the design of the flowing channel for reducing the energy consumption. The results show that the design of the device satisfies the operation requirements of thermal recovery, the means to further improve the device is obtained, and it significantly improves the efficiency of measuring oil reservoir parameters.

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