Preparation method of delayed-coagulation acrylamide single body profile control agent

Abstract

The invention relates to a preparation method of a delayed-coagulation acrylamide single body profile control agent, which relates to the technical field of the petrochemical industry. The delayed-coagulation acrylamide single body profile control agent is formed by mixing an acrylamide single body, initiator, amine crosslinking agent, stabilizer, assistant and fresh water. The preparation method is low in cost, shearing-resisting, simple in construction process, capable of delaying the coagulation, long in initial gelatinizing time, high in final set strength, good in selectivity, ingressive, firm to seal, abrasion-resisting, long in validity, capable of reducing the pollution on an oil layer, effective for coordinating the contradiction of the interlayer and the plane and capable of realizing the purpose of deep profile control. The acrylamide single body delayed-coagulation profile control agent is used for adjusting a water absorption profile of a water injection well in the water injection development process of an oil field and sealing a fluid channeling passage, a high-permeable layer and a water outlet layer of the oil well, and can effectively increase the water drive swept volume and increase the oil recovery.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a preparation process of a plugging regulating agent used for adjusting the water absorption profile of a water injection well, blocking channeling passages between oil and water wells, a high permeability layer and an oil well water outlet layer in the water injection development process of an oil field. Background technique [0002] Most oilfields in my country are developed by early water injection, and have entered the medium-high water cut period. The widely used production stimulation measures under the original water injection conditions are getting worse and worse. The requirements for profile control and water shutoff technology are getting higher and higher. Therefore, it is urgent to find effective new methods to improve the development effect of oilfields in high water cut period. The level of water flooding oil recovery depends on the macroscopic sweep...

AI Technical Summary

Problems solved by technology

The use of this type of main agent involves the following problems: 1. Since high molecular polymers are used, these powders should be added to fresh water in batches in advance, stirred for a long time, and then experience swelling and dissolution. The process and operation are cumbersome; 2. Generally, the higher the molecular weight of polyacrylamide, the better the plugging effect

The price of high molecular weight polyacrylamide is high. Three, the viscosity shear loss rate is large during the injection process after the polymer is dissolved, the gelling performance and the strength after gelation are greatly affected, the formation is sheared, and the formation viscosity retention rate is low; four. Usually these high-valent metal ion systems have fast gelation time, high initial viscosity, easy to pollute the oil layer and are not conducive to entering the deep part of the oil layer

[0006] The plugging agent with acrylamide as the main agent at home and abroad has a gelation time of only a few hours; the construction dosage is low, and the plugging radius is small; it is sensitive to external conditions such as temperature, the gelation is fast, and the construction risk is large. Gelling in surface tanks and wellbore during injection, causing accidents

At present, there are few reports on acrylamide plugging regulators