Combustion exploitation method for thin-layer and deep-layer original heavy oil reservoir

Abstract

The invention discloses a combustion exploitation method for a thin-layer and deep-layer original heavy oil reservoir. The combustion exploitation method aims at solving the problems that when the thin-layer and deep-layer original heavy oil reservoir is combusted, the pressure is large, the temperature is high and the shaft damage risk is high in the ignition stage, and efficient exploitation of combustion huff and puff and combustion displacement of the thin-layer and deep-layer original heavy oil reservoir is achieved. According to the combustion exploitation method, a viscosity reducer is injected, a bottom low-viscosity channel and a top low-viscosity channel are formed between a gas injection well and an exhaust well, then a top flue exhaust channel is formed, and therefore flue gas is exhausted from the top, the underground high-temperature combustion pressure is reduced, and the purposes of controlling the underground temperature and preventing shaft damage are achieved; the bottom directional low-viscosity channel serves as a combustion displacement oil production channel in the later period; and the whole exploitation process comprises the steps of combustion huff and puff pressure reduction and then fire flooding operation.

Description

Technical field [0001] The present invention relates to the field of oilfield development, and in particular, a thin layer, an deep original heavy oil reservoir, a fire-making method. Background technique [0002] At present, the main technology of heavy oil mining is still steam development, including steam throughput, steam drive, steam assist gravity discharge. Since there is a high energy consumption, poor economic efficiency, poor environmentally friendly pressure, the injection of air development is gradually attaching importance to the industry. Among them, fire-free fire techniques are in size from the forefront of the forefront. [0003] Fire-burning techniques are generally used as a replacement technology after steam throughput, with many advantages: 1) The fire is extremely low due to the high degree of production, the residual oil saturation is very low, and is the ultimate technology developed in oil field. 2) Fire burns using inexpensive air as an injection medium,...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method of incineration mining of thin and deep original heavy oil reservoirs, so as to solve the problems of high pressure, high temperature and high risk of wellbore damage in the ignition stage when thin and deep original heavy oil reservoirs are burned. , to realize the efficient development of thin and deep original heavy oil reservoirs with fire huff and puff first and then fire displacement

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