Quantitative evaluation method of heavy oil steam stimulation water flooded layer

Abstract

The invention provides a quantitative evaluation method of a heavy oil steam stimulation water flooded layer. The quantitative evaluation method of the heavy oil steam stimulation water flooded layer comprises the following steps: step 1, determining resistivity of mixed formation water of the heavy soil stimulation water flooded layer according to analysis assay data or logging curve data of the formation water of the water flooded layer; step 2, calculating oil reservoir water saturation Sw according to rock resistivity of a coring well by using an archies formula on the basis of determining the resistivity of the mixed formation water of the heavy oil stimulation water flooded layer; step 3, calculating oil displacement efficiency eta of the water flooded layer according to the calculated oil reservoir water saturation Sw and oil-water relative permeability test data of the coring well; step 4, establishing a heavy oil stimulation water flooding degree judgment standard to realize quantitative judgment and recognition of the water flooding degree of the heavy oil stimulation. The quantitative evaluation method of the heavy oil steam stimulation water flooded layer has better operability, contributes to generalization, and provides a practical and feasible method for fine description of the heavy oil reservoir stimulation water flooded layer.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a quantitative evaluation method for heavy oil steam huff and puff water-flooded layers. Background technique [0002] At present, the main targets of water flooding evaluation in major oilfields are water flooding thin oil reservoirs (the viscosity value of crude oil is generally less than 50mPa·s, and the density of crude oil is less than 0.9200g / cm 3 ), its evaluation method is not suitable for steam huff and puff heavy oil reservoirs (the viscosity of crude oil is generally greater than 50mPa·s, and the density of crude oil is greater than 0.9200g / cm 3 ), mainly in the following aspects: [0003] 1. Heavy oil steam injection huff and puff development is an intermittent production method, and its development process is steam injection-simmering well-oil production-steam injection. The biggest difference from continuous production driven by water injection is that...

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Problems solved by technology

[0003] 1. Heavy oil steam injection huff and puff development is an intermittent production method, and its development process is steam injection-simmering well-oil production-steam injection. The biggest difference from continuous production driven by water injection is that the components of the produced liquid during the production process are Unstable, the degree of flooding cannot be judged intuitively from the water production rate;

[0004] 2. The density of steam injected during heavy oil steam injection huff and puff production is small, and after injection, it will move to the top of the oil layer to cause overburden phenomenon. From the steam injection center to the distance, the steam gradually condenses into water, and the condensed water flows downward due to gravity. move and cause water flooding at the bottom of the reservoir

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