Thermal production well annulus thermal insulation system and method

Abstract

The invention relates to a thermal production well annulus thermal insulation system which comprises a vacuum pump (1), a thermal insulation oil pipe (3), a high temperature and high pressure resistance packer (5) and a casing pipe (7). The thermal insulation oil pipe is in the middle of the inside of the casing pipe, the high temperature and high pressure resistance packer forms a closed oil jacket annulus between the thermal insulation oil pipe and the casing pipe, a thermal insulation coating (4) is arranged on the outer wall of the thermal insulation oil pipe, and the vacuum pump is used for vacuumizing the oil jacket annulus so that the thermal convection coefficient of the inside of the oil jacket annulus can be reduced. The invention further relates to a method for thermal production well annulus thermal insulation by means of the thermal insulation system. According to the thermal production well annulus thermal insulation system and method, heat loss of heat inside a shaft can be reduced, damage to the casing pipe is reduced, and the thermal recovery effect is improved. The thermal production well annulus thermal insulation system and method are applied to the technical field of heavy oil well column thermal fluid exploitation.

Description

technical field [0001] The invention relates to a heat recovery system and method for annulus heat insulation, which can be used in the technical field of heat injection fluid production in heavy oil wells. Background technique [0002] Heavy oil has high viscosity and poor fluidity, and conventional cold recovery can no longer meet the needs of efficient oilfield development. Therefore, hot fluid injection (hot water, steam or a mixture of steam and non-condensate gas) has become one of the main technologies for heavy oil production at home and abroad. In the process of huffing and puffing of heat injection fluid in heavy oil wells, if the heat insulation effect of the wellbore is not ideal, as the number of huffing and puffing increases, the casing will be damaged and deformed by repeated high temperature and high pressure thermal stress, which will seriously affect the normal production of the oil well; at the same time , as the casing temperature rises, the heat loss to...

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Problems solved by technology

In the process of huffing and puffing of heat injection fluid in heavy oil wells, if the heat insulation effect of the wellbore is not ideal, as the number of huffing and puffing increases, the casing will be damaged and deformed by repeated high temperature and high pressure thermal stress, which will seriously affect the normal production of the oil well; at the same time , as the casing temperature rises, the heat loss to the formation accelerates, and the utilization rate of heat energy decreases, which affects the effect of thermal recovery to increase oil production

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