Preparation process of positioning channeling blocking agent

Abstract

The invention discloses a preparation process of a positioning channeling blocking agent, and relates to the technical field of oil field development. The preparation process comprises the following steps: mixing ethanol, ethyl acetate, sodium lauryl sulfate, alkyl phenol polyoxyethylene (10) ether, ammonium persulfate, oxalic acid, furfuryl mercaptan, tripolycyanamide, formaldehyde, acrylonitrile and 2,6-toluene diisocyanate for reaction to obtain ammonium persulfate microcapsules; sequentially adding phenol and caustic soda into formaldehyde for reaction to generate phenolic resin; adding the ammonium persulfate microcapsules and the phenolic resin into a mixed solution of liquid acrylamide and tap water, and carrying out reaction at an ambient temperature of 80 DEG C to generate the positioning channeling blocking agent. The preparation process is simple, convenient, safe, and low in risk; by the preparation process, pollution of a plugging agent to a low-permeability layer can be reduced, movement of a gelatinized plugging agent in a stratum is avoided, and the plugging strength is ensured.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to the technical field of increasing production and injection of oil-water wells such as oil-water well plugging and flooding regulation, acidizing temporary plugging, water plugging and channeling sealing. Background technique [0002] Oil field profile control, flood control, water shutoff, temporary plugging and other conventional oil and water wells to increase production and injection, precipitation and oil increase measures, need to use water shutoff agent to seal high permeability layer and channeling channel (referred to as channeling). Up to now, experts at home and abroad have been looking for a technology that only blocks water but not oil. The key is that the required plugging agent can enter the channeling channel like water in the longitudinal direction, without polluting the oil layer, and can generate sufficient strength at the predetermined depth. The g...

AI Technical Summary

Problems solved by technology

Polyacrylamide and acrylamide monomer gels are mostly used in the field, but there are still bottleneck problems in this type of gel: ① There is an irreconcilable contradiction between gelation time and gelation strength, that is, prolonging the gelation time will result in After gluing, the gel strength becomes lower, and the water channel cannot be sealed. If the gel strength is increased, the gelation time will be short, the injectability will be poor, the formation will be sheared seriously, the water will be lost quickly, the strength loss will be large, and the plugging effect will be poor; it is matched with it The advanced technology is not conducive to the adjustment of intra-layer and plane contradictions, and it will inevitably lead to oil layer pollution

②Sealing agents based on AM (acrylamide monomer) have high strength, but due to the short gelation time, gelation is often formed in the ground liquid distribution tank, wellbore or near the well, resulting in frequent safety production accidents , and the cost of acrylamide monomer is high, the construction period is long, and the labor force is large, which affects the scale of popularization and application of this technology

[0006] Therefore, due to the influence of the performance of the plugging agent, at present, the amount of plugging and channeling agent used is large, the cost is high, the oil layer is seriously polluted, the underground distribution of the plugging agent is unclear, and there are serious problems such as failure to plug or blockage.

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