A multifunctional ball valve assembly for heavy oil thermal recovery wells

Abstract

The invention relates to a multifunctional ball valve assembly for a thickened oil thermal production well. The multifunctional ball valve comprises an upper connector of which the upper rend can be connected with an oil pipe connector, a push-pull sleeve of which the upper end is fixedly connected with the lower end of the upper connector, two gear racks symmetrically and fixedly arranged at the lower end of the push-pull sleeve and extending in the axial direction, a ball valve sleeve of which the upper end is sleeved by the push-pull sleeve and capable of sliding up and down relative to the push-pull sleeve, a ball valve core rotatably mounted in the cavity of the ball valve sleeve through two symmetrically and fixedly arranged ball valve rods, and two gears mounted outside the ball valve sleeve and fixedly connected with the two ball valve rods respectively, wherein a lower connector in sealed connection with an anchor is further arranged at the lower end of the ball valve sleeve; the gear racks at the lower end of the push-pull sleeve are meshed with the gears all the time. In the lifting or pressing process of the upper connector, the gear racks drive the gears to rotate, the gears drive the ball valve rods fixedly connected with the gears to rotate together, and the ball valve rods drive the ball valve core to rotate, so that the opening and closing of the ball valve assembly is realized. The multifunctional ball valve assembly can be widely applied to production operation of the thickened oil thermal production well.

Description

technical field [0001] The invention relates to a downhole tool used in heavy oil thermal recovery wells, in particular to a multifunctional ball valve assembly for heavy oil thermal recovery wells. Background technique [0002] In the currently known heavy oil production process, methods such as heat injection are widely used to heat the crude oil, and then electric pumps and other methods are used for extraction. In this development process, the heat injection string must be lowered first, steam and other heating media should be injected into the formation, and then the production string should be lowered for production; In order to ensure the safety of life and the protection of the oil layer from pollution during the production process and the marine environment from pollution, it is necessary to apply special anti-fouling devices on production wells. However, due to the complex environment such as high temperature and high pressure in the underground, the requirements ...

AI Technical Summary

Problems solved by technology

However, due to the complex environment such as high temperature and high pressure in the underground, the requirements for the sealing performance and switching methods of downhole tools, especially various downhole valves, are particularly high. Conventional tools cannot withstand high temperatures and are not suitable for thermal recovery operations. Most of the opening and closing are manual, which requires steel wire operation, high risk of operation, low efficiency, and cannot guarantee the demand for multiple uses, which affects the use effect

Therefore, there is currently a lack of dedicated downhole tools that can protect reservoirs in harsh downhole environments such as high temperatures

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