Selection and water plugging method of selective water plugging agent for oil well

Abstract

The invention provides a selection and water plugging method of a selective water plugging agent for an oil well, and relates to the field of oilfield chemistry. The invention discloses a selection and water plugging method of a selective water plugging agent. The selective water plugging agent is mainly prepared from the following components in percentage by mass: 0.1-0.4% of a nano material, 0.2-1.0% of a polymer, 0.2-1.0% of a cross-linking agent and the balance of nanofiltration seawater. The selective water plugging agent for the oil well is prepared from the raw materials, the preparation process is simple, the final setting time is adjustable within 16 h, the oil phase plugging rate is smaller than 30%, the water phase plugging rate is larger than 88%, and the selective water plugging agent has good selective plugging capacity and can meet the water plugging requirement of an oil field.

Description

technical field [0001] The invention relates to the field of oilfield chemical enhanced recovery, in particular to a selection of a selective water shutoff agent and a water shutoff method. Background technique [0002] In the process of oilfield development, water outflow from oil reservoirs will bring many serious impacts on oilfield development work, such as: formation energy loss, production decline, water treatment cost increase, equipment corrosion and other issues. Therefore, implementing water shutoff in high water-cut oilfields has become an effective means to reduce costs and increase efficiency in oilfields. [0003] The purpose of water plugging is to control the flow of water in the water-producing layer and change the flow direction of water in the water flooding oil, improve the efficiency of water flooding, and try to make the water production of the oilfield decrease or stabilize for a period of time, so as to ensure the increase or stability of the oilfield...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor oil-water selective plugging ability of plugging agents, the present invention provides a selective water plugging agent selection and water plugging method for oil wells, which has the advantages of salt resistance, easy pumping, good elasticity, and its own oil 、Water has a strong selective plugging ability, which reduces the harm of misplugging oil layers and increases oil production

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