The Method of Improving the Effect of Waterflooding in Bottom Water Reservoir by Using Multi-stage High Pressure Water Jet

Abstract

The invention discloses a method for improving the water-flooding development effect of a bottom water reservoir by utilizing multistage high-pressure water jet. The method comprises the following steps: step one, selecting the optimal jet region of the bottom water reservoir; step two, determining the number of jet oil wells, and carrying out statistical classification on the filtered oil wells; step three, developing the quantitative theory analysis of bottom water coning for the filtered oil wells, and adopting an improved bottom water coning model new algorithm to obtain the parameters, such as optimal critical speed and jet-avoiding height, of each single oil well by adopting the treatment of the high pressure water jet; step four, establishing an oil reservoir numerical simulation model according to the reservoir geology characteristics of an oil field; step five, determining the parameters such as the optimal point position, jet direction and jet angle of the high-pressure water jet according to the optimal critical speed and the jet-avoiding height which are obtained by theoretical calculation and numerical oil reservoir simulation.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploration, namely a method for improving the water flooding development effect of bottom water reservoirs by using multi-stage high-pressure water jets. Background technique [0002] The main professional concepts involved in this technical field are as follows. [0003] (1) Bottom-water reservoir: If the oil-water contact (OWC) is very large, much larger than the vertical section of the oil layer, it is a bottom-water reservoir. Generally speaking, bottom water reservoirs have fast water breakthrough, especially reservoirs with poor oil-water mobility ratio, are prone to bottom water coning. The production effect of horizontal wells is better. If there is a certain degree of heterogeneity, water cones may be formed locally in horizontal wells, resulting in a large amount of water production. [0004] (2) High-pressure water jet: refers to pressurizing water to hundreds of atmospheric pressu...

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Problems solved by technology

[0009] The production of traditional vertical wells and horizontal wells is only single-point and linear control. Multi-stage high-pressure water jets are used to manufacture multi-directional branch control. The seepage field of oil wells changes from conventional radial flow to linear flow, which increases the swept volume of water flooding.

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