Multi-element medium composite huff and puff development method for heavy oil reservoir

Abstract

The invention provides a multi-element medium composite huff and puff development method for a heavy oil reservoir. The method comprises the following steps of injecting a high-temperature plugging agent into a stratum; after the high-temperature plugging agent is condensed, injecting a viscosity reducer, a foaming agent and non-condensate gas, or injecting the viscosity reducer, the foaming agent and urea; and finally, injecting steam into the stratum. According to the method, multi-element media such as the high-temperature plugging agent, the viscosity reducer, the foaming agent and the non-condensate gas (or urea) are sequentially injected into the bottom layer before the steam is injected, so that the purposes of improving the production degree of an oil layer profile, reducing the viscosity of crude oil, supplementing stratum energy, improving periodic oil production and the oil-steam ratio, improving the oil reservoir recovery efficiency and increasing economic benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of oil reservoir exploitation, in particular to a multi-media composite huff and puff development method for heavy oil reservoirs. Background technique [0002] Currently, heavy oil thermal recovery development methods mainly include steam huff and puff, steam flooding, and fire flooding. Steam huff and puff is a relatively simple and mature heavy oil development method that first injects a certain amount of steam into the oil well, shuts the well for a period of time, and waits for the thermal energy of the steam to spread to the oil layer, and then opens the well for production. The process of steam huff and puff operation can be divided into three stages, namely, steam injection, soaking well and recovery. In the process of steam huff and puff development, there are serious steam channeling between wells, low production degree of oil layer section, high viscosity of crude oil and short effective productio...

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Problems solved by technology

[0003] The main purpose of the present invention is to provide a multi-media composite huff and puff development method for heavy oil reservoirs to solve the problem of severe steam channeling between wells, low production degree of oil layer sections, high crude oil viscosity, short effective production period, and formation problems in the steam huff and puff process in the prior art. Low energy, poor drainage ability, etc.