Viscosity reduction collection well

Abstract

The invention discloses a viscosity reduction collection well. According to the viscosity reduction collection well, in the oil extraction process, viscosity reduction treatment can be carried out on thickened oil with the higher viscosity, and therefore thickened oil liquidity can be improved, and the smooth extraction of oil in thick oil reservoirs can be ensured. The viscosity reduction collection well comprises a main oil pipe, a hollow sucker rod and an oil shaft. A drilling riser is arranged in the oil shaft, and the lower end of the main oil pipe stretches into the oil shaft; a screw pump is arranged in the main oil pipe, and a main working screw rod of the screw pump is connected with the sucker rod; a sand-prevention screen pipe is arranged in the lower part of the oil shaft, and a screen pipe oil outlet is formed in the top of the sand-prevention screen pipe; the screen pipe oil outlet is communicated with an oil inlet of the screw pump, and a cable is arranged in the sucker rod; and one end of the cable is connected with a power source. The viscosity reduction collection well has the beneficial effects that the thickened oil can be reasonably heated, so that the viscosity of the thickened oil is reduced, and collection is facilitated; and carbon dioxide gas and water steam can be led into the well, and therefore the viscosity of crude oil to be lifted and crude oil in the lifting process can be reduced.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, and in particular relates to a viscosity-reducing collection well. Background technique [0002] Heavy oil reservoirs are widely distributed in the world. According to statistics, the geological reserves of heavy oil (including bitumen) reservoirs are at least four times that of proven conventional crude oil reserves, and even more than six times in optimistic estimates. With the exploration of deep water, deep water heavy oil has received more and more attention, and its exploitation and development activities have also been carried out all over the world. [0003] However, the water depth of deep-water oil fields is generally between 500 and 2,500 meters. Due to factors such as its deep depth, a low-temperature area will be formed on the seabed. In addition, the temperature sensitivity of heavy oil and its own high viscosity, so in the low-temperature area. The flow is diffi...

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Problems solved by technology

[0003] However, the water depth of deep-water oil fields is generally between 500 and 2,500 meters. Due to factors such as its deep depth, a low-temperature area will be formed on the seabed. In addition, the temperature sensitivity of heavy oil and its own high viscosity, so in the low-temperature area. Difficulty flowing, or even gradually losing fluidity, so that the oil well cannot maintain normal production

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