Steam huff and puff exploitation method

Abstract

The invention provides a steam huff and puff exploitation method. The method comprises the following steps: selecting a well network of a closed horizontal well as an injection and exploitation well network; injecting non-condensed non-hydrocarbon gas into the injection and exploitation well network, wherein the injection amount is calculated according to the following formula: Q=AV / T, wherein Q is a ground injection amount of the non-condensed non-hydrocarbon gas, the unit of Q is m<3>, V is a ground layer voidage volume, the unit of V is m<3>, A is 9669, T is a ground layer temperature, and the unit of T is K; continuously injecting high-temperature steam into the injection and exploitation well network; carrying out a huff and puff production process, and carrying out sleeve gas monitoring in the production process; when the content of injected gas is raised to 70%-100%, closing a well for 6-12 hours; after a gas-liquid interface is recovered, opening the well to produce. The steam huff and puff exploitation method provided by the invention can be used for steam huff and puff exploitation of heavy oil reservoirs, and the steam huff and puff exploitation effect of the heavy oil reservoirs can be effectively improved.

Description

technical field [0001] The invention relates to a steam huff and puff production method, in particular to a production method for improving the huff and puff production effect of heavy oil reservoirs, and belongs to the technical field of petroleum production. Background technique [0002] At present, steam huff and puff is still the main development method for mining heavy oil. After the number of huff and puff increases, the production effect becomes worse, reflecting the characteristics of "low pressure, low production, and low oil-steam ratio", which greatly reduces the recovery effect of heavy oil reservoirs . [0003] Through the analysis of the reasons that affect the effect of huff and puff, it is found that the root cause of the poor huff and puff effect of oil wells is the pressure drop of the formation. Crude oil is displaced into the wellbore and produced, resulting in poor development effect and severely restricting the production effect of huff and puff wells....

AI Technical Summary

Problems solved by technology

[0003] Through the analysis of the reasons that affect the effect of huff and puff, it is found that the root cause of the poor huff and puff effect of oil wells is the pressure drop of the formation. Crude oil is displaced into the wellbore and produced, resulting in poor development effects and severely restricting the production effect of huff and puff wells

[0004] In view of this problem, at present, the steam huff and puff recovery effect of heavy oil reservoirs is mainly improved by implementing ternary compound huff and puff method, XYG method and other energy-enhancing and drainage-assisted methods. The effect of steam huff and puff recovery in heavy oil reservoirs is not significantly improved

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