Method for lifting heavy oil through shaft in heavy oil cold production

Abstract

The invention discloses a method for lifting heavy oil through a shaft in heavy oil cold production, which is applied to the oil production in oil fields and is especially used for heavy oil cold production. The method comprises the following steps of: preparing a viscosity reducer A; putting a production string in a heavy oil well; putting a production roof-bolt in an oil tube; adjusting the dead space of the production roof-bolt; adding circulating softened water from a water inlet of a tee for two coaxial hollow rods, and starting a ground circulating pump to carry out softened water circulating; after the outlet temperature of the circulating softened water subjected to heating reaches 55-60 DEG C, opening the oil well and starting a pump to carry out production; and adding the viscosity reducer A from a position between the oil tube of the oil well and a casing, and recovering liquid in the well through lifting. The method disclosed by the invention has the effects that: the liquidity of heavy oil in the shaft can be improved, and the problem of shaft lifting can be solved; and in the process of restarting the pump to pump oil after power failure, an internal circulating system of the two coaxial hollow rods is started firstly, and after the output temperature reaches 55-60 DEG C, the oil well is opened to carry out oil production, thereby reducing the load of the oil well in the process of starting, and prolonging the pump inspection time of the oil well.

Description

technical field [0001] The invention relates to an oil production method in an oil field, in particular to a method for lifting heavy oil in a heavy oil cold recovery wellbore. It is suitable for the exploitation of edge-zero heavy oil wells and lifts crude oil to the ground. Background technique [0002] The commonly used lifting techniques for heavy oil cold recovery include electric heating rods, wellbore chemical viscosity reduction with screw pumps, and thin oil blending. [0003] Wei Yuejin et al. published an article on the application of electric heating rods in heavy oil lifting technology in the first issue of petroleum drilling and production technology in 2008, pointing out that the depth of the pump in the screw pump oil production process has a certain limit, while the electric heating rod oil production process has a wide range of applications. The hanging depth of the pump is not limited, and it can be heated continuously. For this reason, the oil recovery t...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a method for lifting heavy oil in the wellbore of cold recovery of heavy oil, using screw pumps with double hollow sucker rods and chemical viscosity reducers to lift heavy oil, overcoming the need to use ordinary ground-driven screw pumps for lifting and pumping. The torque of the oil rod is large, and it is difficult to start after stopping pumping; it overcomes the problem of asynchronous lifting of the coaxial double hollow rods for the pumping unit

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