A Plugging and Adjusting Method for Reservoirs in Extra-high Water Cut Period

Abstract

The invention discloses a plugging and adjustment method for oil reservoirs in ultra-high water-cut periods. The method includes: Step 1. According to the distribution characteristics of remaining oil, determine the type of water flooding zone of the target oil reservoir, and the type of water flooding zone includes extreme water washing water flooding zone, strong water flooding zone and weak water flooding zone. , then determine the corresponding plugging and adjusting system and system dosage according to the reservoir characteristic parameters of this type of water washing zone; step 3, block and adjust the well section and depth of the extreme washing zone based on the plugging and adjusting system and system dosage. According to the characteristics of reservoir development and the distribution of remaining oil in the ultra-high water-cut period, this method establishes a scientific reservoir water flooding classification standard based on water plugging and profile control, and establishes a new ultra-high water flooding zone in the classification standard. The deep plugging and adjusting method of water-cut oilfield is beneficial to improve the effect of water-cutting and profile-controlling in ultra-high water-cut oil reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and relates to a method for water plugging and profile control of oil reservoirs in ultra-high water-cut periods. Background technique [0002] Water plugging and profile control is an important technology to improve water flooding. With the continuous deepening of oilfield development, medium and high permeability water flooding reservoirs generally enter the ultra-high water cut period. At this stage, the remaining oil is generally dispersed, and the heterogeneity of the reservoir is more complicated. It is more difficult to classify reservoir water flooding in the vertical and horizontal planes, and the traditional method of near-wellbore water plugging and profile control to improve the profile has become less and less effective in mine fields. [0003] In the existing literature reports, water flooding levels are defined as four levels of strong water flooding, medium-s...

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Problems solved by technology

[0002] Water plugging and profile control is an important technology to improve water flooding. With the continuous deepening of oilfield development, medium and high permeability water flooding reservoirs generally enter the ultra-high water cut period. At this stage, the remaining oil is generally dispersed, and the heterogeneity of the reservoir is more complicated. It is more difficult to classify reservoir water flooding vertically and horizontally, and the traditional method of near-wellbore water plugging and profile control to improve profile has become less and less effective in mine fields

[0003] In the existing literature reports, water flooding levels are defined as four levels of strong water flooding, medium-strong water flooding, moderate water flooding and weak water flooding according to the remaining oil. The division standard is single and the concept is not clear, which cannot guide water plugging and profile control. The application in the mine field leads to the unsatisfactory effect of water plugging and profile control

In addition, the existing technologies related to water plugging and profile control mainly focus on the plugging of large pores, dominant seepage channels or channeling channels, and there is no targeted plugging or regulation technology for reservoir heterogeneity characteristics

In the actual development process of the mine, especially in ultra-high water-cut blocks, it is impossible to achieve the purpose of enhancing oil recovery only by blocking a single large pore, dominant channel or high-permeability zone.

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