CCUS system for extracting oil based on gas lifting method and application thereof

Abstract

The invention discloses a CCUS system for extracting oil based on a gas lifting method and application thereof. The CCUS system comprises an extraction pipeline, a carbon dioxide pipeline, a natural gas pipeline, a gas generator set and an electric heating paraffin removal device, wherein the extraction pipeline is used for separating a gas source into carbon dioxide and natural gas; one part of the natural gas is used for extracting oil of a gas lifting well set by using the gas lifting method; the other part of the natural gas is used for supplying power to the electric heating paraffin removal device through the gas generator set. According to the design of the CCUS system, the power supply cost and the technique difficulty of ground grids are reduced; the grid load is reduced; the extracted natural gas can be utilized on site; both the carbon dioxide generated by extracting oil and the carbon dioxide discharged by the gas generator set are used for extracting the oil of the gas lifting well set by using the gas lifting method, so that the recycling rate of the carbon dioxide is greatly increased and the emission of the carbon dioxide is reduced.

Description

technical field [0001] The invention relates to a CCUS system for oil recovery based on a gas lift method and its application, and belongs to the technical field of wellbore wax removal and blocking removal, and carbon dioxide capture, utilization and storage. Background technique [0002] Gas lift oil recovery is a kind of oil recovery that relies on the mixing of high-pressure gas injected into the well from the surface and the fluid produced from the oil layer in the wellbore, and uses the expansion of the gas to reduce the density of the mixed liquid in the wellbore, and lifts the crude oil flowing into the well to the surface. Way. Gas lift recovery is one of the mechanical recovery methods that is more adaptable to oil well production conditions. It is often used in high-yield deep wells and oil wells with low sand content, low water content, high gas-oil ratio and low corrosive components. Gas lift production must have sufficient gas source, generally natural gas pro...

AI Technical Summary

Problems solved by technology

Due to the high wellhead casing pressure of gas lift wells, the oil wells cannot realize non-stop production and injection of hot fluid when the wax is removed by thermal washing, which affects the oil production rate

When the electric heating method is used to remove wax, since there is no sucker rod in the gas lift well, the wellbore or casing can only be used as the heating element in the circuit for electric heating, resulting in the need to stop production, replace the wellbore string or the casing string, increase operating costs

[0004] In addition, the thermal wax removal process inevitably uses coal, natural gas and other fossil fuels to provide thermal energy, resulting in increasing greenhouse gas emissions

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