Method of optimizing steam soaking and injection parameters of complex fault block heavy oil reservoir

Abstract

The embodiment of the invention provides a method of optimizing steam soaking and injection parameters of a complex fault block heavy oil reservoir. The method comprises the following steps of acquiring the oil reservoir pressure and the initial steam injection strength of a target well; and regulating the initial steam injection strength according to the oil reservoir pressure and a corresponding relationship between the preset oil reservoir pressure and the steam injection strength. Compared with the prior art, according to the method provided by the embodiment of the invention, cyclically soaked steam injection quality is configured without depending on the reservoir thickness, but the oil reservoir pressure and the initial steam injection strength of the target well are acquired firstly, and then, the initial steam injection strength is regulated according to the oil reservoir pressure and the corresponding relationship between the preset oil reservoir pressure and the steam injection strength, so that the steam injection strength can well meet the needs of heating heavy oil, and the recovery ratio of the oil reservoir is increased; and in addition, in order to reach better effects, other steam soaking and injection parameters including a steam injection mode, auxiliary steam injection intervention, steam injection dryness and / or a steam soaking and injection cycle can also be selectively optimized according to the practical needs.

Description

technical field [0001] The present application relates to the technical field of heavy oil reservoir development, in particular to a parameter optimization method for huff and puff steam injection in complex fault block heavy oil reservoirs. Background technique [0002] At present, heavy oil reservoirs are generally exploited by steam huff and puff. The so-called steam huff and puff is to inject a certain amount of steam into the oil well, and then close the oil well for a period of time. After the thermal energy of the steam diffuses to the oil layer and the fluidity of the heavy oil reservoir becomes stronger, the oil well is opened for heavy oil production. [0003] In the heavy oil steam huff and puff technology, the parameters of steam injection in the reservoir will directly affect the stimulation effect of steam injection on the reservoir and affect the periodic oil production. For conventional heavy oil reservoirs, the design of reservoir steam injection parameters...

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Problems solved by technology

[0004] For complex fault-block heavy oil reservoirs (such as ultra-heavy oil reservoirs, low-pressure reservoirs in the later stage of development, and steam channeling reservoirs with steam channeling channels after years of development), due to their oil properties, formation pressure and formation heterogeneity Influenced by nature, etc., steam injection is prone to uneven steam absorption. If the steam injection parameters are determined by conventional methods, it will affect the oil recovery factor.

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