Selective water plugging agent and oil and gas field high-temperature-resistant and high-pressure-resistant long-acting oil-stabilizing and water-controlling method

Abstract

The invention relates to a selective water plugging agent and an oil and gas field high-temperature-resistant and high-pressure-resistant long-acting oil-stabilizing and water-controlling method. The selective water plugging agent is prepared from, by weight, 35.0-75.0% of cement; 0.5-15.0% of a modifier; 0.5-7.0% of a pore forming agent; 0.5-8.0% of an additive; 1.0-15.0%t of a cosolvent; and the balance of water. The selective water plugging agent has strong oil-stabilizing and water-controlling characteristics, can effectively reduce the water-phase permeability, and has small influence on the oil-phase permeability, the curing time is adjustable, the compressive strength after curing can reach more than 10 MPa, the requirements of different well depths and well temperatures are met, and the application range is wide; the preparation process is simple, and polymerization reaction and cross-linking reaction are not needed through simple compounding; and the manufacturing cost is low, and meanwhile, the subsequent treatment cost can be reduced.

Description

technical field [0001] The invention relates to a selective water shutoff agent and a high temperature and high pressure long-term oil stabilization and water control method for oil and gas fields, belonging to the technical field of oil field chemistry. Background technique [0002] In the later stage of the oil field production process, oil flooding has been done many times, the geological inhomogeneity and the difference in the oil-water mobility ratio lead to the continuous development of formation water or injection water, and the average water content of the oil well production fluid is high, resulting in the shortened service time of pipeline equipment and oil production. The recovery rate of reservoirs decreases, especially in offshore oilfields, due to the increase of water content in the produced fluid, the cost of post-processing increases significantly. At present, the most widely used measure for oil wells is water shutoff technology. Commonly used is to use ch...

AI Technical Summary

Problems solved by technology

[0005] In view of the above technical problems, the present invention provides a selective water shutoff agent and a high temperature and high pressure long-term stable oil and water control method for oil and gas fields, which overcomes the shortcomings of the selective water shutoff method and water shutoff agent in the prior art, and can be injected near oil wells Reservoirs with pore-throat diameters greater than 20 μm, regardless of oil layers and water layers, have good oil-water separation ability after injection and solidification. Crude oil can pass through but only a small amount of water can pass through, so as to stabilize oil and control water. It also has the function of sand control and reduces the cost of follow-up treatment

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