Recovery well

Abstract

The invention discloses a recovery well and aims at providing a recovery well capable of carrying out viscosity reduction processing on thickened oil with relatively high viscosity in the oil recovery process, thus improving the liquidity of the thickened oil and ensuring the smooth recovery of a thickened oil reservoir. The recovery well comprises a main oil pipe, a hollow sucker rod and an oil wellbore, wherein a marine riser is arranged on the oil wellbore; the lower end of the main oil pipe stretches into the oil wellbore; a screw pump is arranged in the main oil pipe; a main work screw rod of the screw pump is connected with the sucker rod; a sand control screen pipe is arranged at the lower part inside the oil wellbore; a screen pipe oil outlet is formed in the top of the sand control screen pipe; the screen pipe oil outlet is communicated with an oil inlet of the screw pump; a cable is arranged in the sucker rod; and one end of the cable is connected with a power source. The recovery well has the beneficial effects that the thickened oil can be reasonably heated, and the viscosity of the thickened oil can be reduced, so that the recovery of the thickened oil is facilitated; and the recovery well can be replenished with carbon dioxide and vapor, so that viscosity reduction is carried out on to-be-risen crude oil and rising crude oil.

Description

technical field [0001] The invention belongs to the technical field of oil reservoir exploitation, in particular to a recovery 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 difficult, and even gradually loses fl...

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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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