Circulating hot water heavy oil thermal recovery system for ultra-deep well and process thereof

Abstract

The invention relates to a circulating hot water heavy oil thermal recovery system for an ultra-deep well and a process thereof. In the well, a heat insulation pipe is arranged between a casing and an oil pipe for forming an internal annular space between the oil pipe and the heat insulation pipe and an external annular space between the heat insulation pipe and the casing, and the internal and the external annular spaces are communicated at the lower end of the heat insulation pipe; a packer is mounted between the deep-layer casing which is arranged below the heat insulation pipe and at the upper part of an oil layer and the oil pipe so as to block heavy oil from entering the annular space of an oil jacket; on the ground, a pipeline is used for connecting a heating device, a pump vehicle, a return water heat insulation tank and a water conveying pipe with the double annular spaces which are mutually communicated. The return water heat insulation tank is used for receiving return water from the external annular space, the water conveying pump is used for pumping the return water into the heating device for heating and sending the heated return water to the pump vehicle, the pump vehicle is used for pressurizing the heated return water, the pressurized hot water enters into the internal annular space from a well mouth, reaches the lower end of the heat insulation pipe and returns to the well mouth from the external annular space so as to form a heating water circulating passage, and the circulating water can continuously heat the heavy oil in the oil pipe, so that the heavy oil always keep the molten flowing state, thereby realizing smooth recovery of the heavy oil. The method and the production system have the advantages of simple structure, high powder, low operation cost and strong operability.

Description

technical field [0001] The invention relates to a thermal recovery system for ultra-deep well heavy oil with circulating hot water and a process thereof, belonging to the field of deep well heavy oil recovery. Background technique [0002] There is a significant difference between heavy oil in deep formations and heavy oil in shallow formations: heavy oil in shallow formations, due to shallow burial and low formation temperature, is often viscous, semi-solidified, or even solidified, and the formation pressure is also very low. Deep heavy oil, due to deep burial depth and high formation temperature, heavy oil is in a flowing state, and usually the formation pressure is also high. The existing shallow heavy oil production experience at home and abroad is not suitable for deep heavy oil production. Even if the heavy oil can be recovered to the ground, it is shelved by oil production companies due to high costs or excessively complicated processes. According to the analysis of...

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Problems solved by technology

Dilution is the use of expensive thin oil to extract heavy oil with poor quality and low price. The thin oil is sold at the price of heavy oil, and the mining cost is huge, which seriously affects the economic benefits.

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