Method for plugging water in horizontal wells for screen completions

Abstract

The invention provides a water plugging method used for a screen pipe completion horizontal well. The water plugging method used for the screen pipe completion horizontal well comprises the steps that 1, fluid absorption sections of the horizontal well are tested, and whether the horizontal well should be subjected to water plugging is judged; 2, a micro oil-water regulation system is injected, and remaining oil difficult to use is started; 3, a plugging agent system is injected, and water outlet well sections are plugged; 4, high-pressure jet flow is matched with a plug removal system, so that plugging agent pollution and low permeability sections are dredged; and 5, the well is opened to resume production, the micro oil-water regulation system flows back around flow in the plug removal well sections, and the water precipitation reduction and oil increase effects are strengthened. According to the water plugging method used for the screen pipe completion horizontal well, the purposes of the clear water outlet sections, a high plugging purpose, high plugged fluid volumes and a long oil increase expiry date are achieved by applying the integrated comprehensive measures.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a method for shutting off water in horizontal wells with screen tube completion in the oil field development process. Background technique [0002] In the long-term development process of oilfields, due to reservoir heterogeneity, excessive production speed, and reservoir pressure changes, the injected water or edge-bottom water advances rapidly, causing the water content of horizontal wells to rise rapidly, which is likely to cause local water flooding or storms. The water flooding will seriously affect the development effect of horizontal wells and reduce the economic recovery of oilfields. It is imperative to effectively control the high water cut of horizontal wells in order to control water and stabilize oil in oilfields, improve the effect of water flooding development. [0003] Practice has proved that the main reason affecting the poor water pluggin...

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Problems solved by technology

At present, horizontal wells completed with screens rely on chemical water plugging methods, mainly including general injection methods and ACP positioning injection methods. The general injection method is likely to cause low or no liquid after plugging, and the water plugging effect is poor; ACP positioning injection The method can realize the positioning injection of the plugging agent, but the process is complicated, the cost is relatively high, and the required thixotropic system is not yet mature, and the application range is small, which is not conducive to large-scale application

[0005] In order to improve the water shutoff effect of the screen completion horizontal well, there must be a water shutoff method that is simple, effective and has a high success rate. Therefore, the above method has the following shortcomings: ① The general injection method mainly considers the influence of the original permeability and the water avoidance height, The construction is simple, but the water plugging effect is poor; ②The ACP positioning injection method requires long-term operation of the coiled tubing, the process is complicated, the construction is difficult, and the required thixotropic system is relatively harsh; ③The above methods do not consider how to dredge the low-permeability layer and Pollution in the annulus of the screen pipe and the open hole wall may easily lead to low or no fluid flow after plugging

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