Authigenic carbon dioxide low-temperature mixed gas plug-removal and oil-displacing technology for oil well and water well

Abstract

The invention discloses an authigenic carbon dioxide low-temperature mixed gas plug-removal and oil-displacing technology for an oil well and a water well and relates to the field of oil field development. The technology comprises an authigenic carbon dioxide low-temperature mixed gas plug-removal and oil-displacing construction technique for the oil well and the water well. The authigenic carbondioxide low-temperature mixed gas plug-removal and oil-displacing construction technique comprises the steps that firstly, carbon dioxide plug removers are injected into a stratum through the oil welland the water well; then mixed gas and surface active agent liquid are injected, the mixed gas is obtained by separating air through a mixed gas separator, meanwhile the mixed gas separator controlsthe oxygen content, and the surface active agent liquid is prepared on site; the surface active agent liquid and the mixed gas are injected through a continuous injection mode or a multi-slug alternate injection mode, and the adopted gas-liquid ratio is 1:1; and cyclic operation is conducted till construction is finished. The technology combines a mixed gas flooding technology and a plug-removal technology, the purposes of plug removal, depressurizing, injection increasing and oil displacing of the oil well and the water well are achieved, the technology is a novel oil extraction technology which integrates plug removal, cracking, viscosity reduction and thickened oil mass-reduction, surface active agent oil displacing, mixed gas flooding and oil extraction through a crude oil diluting method, and the requirements of oil field production and environmental protection are met.

Description

technical field [0001] The invention relates to the field of oil field development, in particular to an oil and water well self-generated carbon dioxide low-temperature gas-mixing technology for plugging removal and oil displacement. Background technique [0002] At present, the development of oil reservoirs in many oilfields in my country has entered the middle and late stages, and there are problems such as high water content in oil wells, water injection in water injection wells, and increasingly prominent problems exposed in the development of oil and water wells, large input-output ratios, and difficulties in tapping potentials. , the conventional oil recovery and water injection technology can no longer meet the production needs. In order to enhance the recovery factor, chemical flooding technologies are used, such as polymer flooding, alkaline water flooding, composite flooding, surface active oil flooding, etc. However, as the reservoir complexity increases, Increased ...

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Problems solved by technology

This process technology solves the difficulties in the selection of chemical oil displacement agents in chemical oil displacement technology, such as the requirements of high efficiency, economy, and environmental protection of chemical oil displacement agents, the requirements of injection systems, and the treatment of produced fluids. There are problems such as scaling and fingering of alkali flooding, fingering of surfactant flooding, and high cost of composite flooding. At the same time, it solves the problems of gas injection technology, such as the problem of insufficient gas source and high cost of carbon dioxide, natural gas, and nitrogen injection. It also solves the problem of gas channeling and viscous fingering in simple air injection, which leads to some safety hazards caused by oxygen channeling into the oil well

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