Producing well shaft combined gravity assisted heat pipe

Abstract

The invention provides a producing well shaft combined gravity assisted heat pipe, which comprises at least two gravity assisted heat pipe units. Each gravity assisted heat pipe unit is a continuous hollow sucker rod. The upper end and the lower end of the continuous hollow sucker rod are respectively provided with a sealing plug to enable the inner chamber of the gravity assisted heat pipe unit to be a closed chamber. The closed chamber is filled with working medium. A connecting groove is concavely arranged on each sealing plug in a direction towards the center of each gravity assisted heat pipe unit. The gravity assisted heat pipe units are sequentially connected through connectors to form the producing well shaft combined gravity assisted heat pipe. The upper ends and the lower ends of the connectors are correspondingly embedded into the connecting grooves of the opposite two sealing plugs between the two adjacent gravity assisted heat pipe units, and are fixedly bolted with the side walls of the connecting grooves. When the combined gravity assisted heat pipe is placed under a well, each gravity assisted heat pipe unit can sequentially and upwards transfer heat to the gravity assisted heat pipe unit at the upper level from the bottom of the well, the heat is finally transferred to the mouth of the well level body level, the fluid temperature profile of a shaft is further improved, the effect of the temperature of fluid at the mouth of the well is improved and the risk that the traditional ultra-long gravity assisted heat pipe is failed is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of wellbore oil production, and relates to a device for improving the temperature profile of the wellbore fluid in an oil production well, in particular to an oil production well wellbore combined type suitable for increasing the temperature of the wellhead fluid in a conventional oil production mode to reduce the viscosity of the wellhead fluid Gravity heat pipe. Background technique [0002] At present, domestic research has been carried out on the improvement of wellbore fluid temperature profile by wellbore gravity heat pipe. This method overcomes the huge waste of heat caused by common wellbore fluid viscosity reduction methods such as thermal fluid circulation, wellbore electric heating, and chemical viscosity reduction in the actual application process. As well as the defects of post-treatment of produced fluid, the energy of the formation itself can be used to improve the temperature profile of the w...

AI Technical Summary

Problems solved by technology

[0003] However, the existing wellbore gravity heat pipes are all single ultra-long heat pipes, forming a heat pipe with a long inner cavity.

In use, it is found that because the ultra-long heat pipe has a single inner cavity, it is not conducive to transferring heat from the bottom of the well to the wellhead, and the risk of heat transfer failure is prone to occur, which limits the increase of the temperature of the wellhead fluid.

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