Oil well yield splitting method considering time variation and interlayer interference

Abstract

The invention discloses an oil well yield splitting method considering time variation and interlayer interference. The oil well yield splitting method comprises the steps that a well history is subtlyanalyzed, and time nodes of measures such as layer supplement, layer modification, fracturing, acidification, plugging, plugging removal are divided into different splitting stages; and yield is subtly divided and classified according to measures such as simultaneous perforation in an initial stage, acidizing and fracturing in some layers, layer supplement and plugging in some layers, at the sametime, the factors of the interlayer inhibition of a high-yield layer to a low-yield layer and the inheritance of water content ratio in an original layer are taken into consideration, different calculus equations are used for quantifying the liquid production and the water content ratio in each production layer before and after the measures. According to the embodiment of the oil well yield splitting method, the splitting result for 254 wells in 23 years in the target block is more consistent with the production performance than the previous splitting only using KH coefficient, a database anda programming technology are used for realizing automatic splitting and error correction processing of injection and production data, and the timeliness and accuracy of data processing are improved.

Description

technical field [0001] The invention belongs to the technical field of petroleum development, relates to production dynamic analysis and data splitting processing, in particular to an oil well production splitting method considering time variation and interlayer interference. Background technique [0002] Oilfield development has entered the middle and later stages, and the relationship between oil and water is complicated, and the logging curves have long not reflected the current distribution of underground oil and water. To understand the distribution of oil and water in a single layer, the only way to draw an oil level distribution map is to split the production into small layers. The impact of measures on production and water cut can directly reflect the liquid supply and increase capacity of the measure layer. At the same time, the high-yield layer will increase the flow pressure gradient in the well, and the bottom hole flow pressure will increase. The production pres...

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Problems solved by technology

[0003] The traditional KH coefficient production splitting method assumes that all effective thickness formations have oil, and the production splitting is performed according to the ratio of the permeability of each production layer multiplied by the effective thickness. This method has fewer considerations and can only be adapted to ideal formations. KH The splitting method does not fully consider the connectivity, pressure difference, and material and energy balance of the reservoir, and its parameters are relatively single. Its limitations mainly include the following aspects:

[0004] 1. The splitting interval span is large, and the production stages are divided by year, not by the time of measures, which is inaccurate;

[0005] 2. Splitting does not combine production dynamics and consider interlayer interference;

[0006] 3. The moisture content of each layer uses the same fixed value, without considering the inheritance of moisture content

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