Active oil-washing sand consolidating agent and preparation method and application thereof

Abstract

The invention relates to an active oil-washing sand consolidating agent. The active oil-washing sand consolidating agent is prepared from the following components in percentage by weight: 20 percent to 30 percent of epoxy resin, 5 percent to 15 percent of methacrylic acid, 5 percent to 15 percent of octadecyl methacrylate, 10 percent to 30 percent of ethylene glycol monobutylether, 10 percent to 20 percent of n-butanol, 10 percent to 20 percent of dimethylethanolamine, 5 percent to 7 percent of benzoyl peroxide and 10 percent to 15 percent of de-ionized water. A mixed solution of the n-butanol and the ethylene glycol monobutylether is used for pre-dissolving the epoxy resin, and the octadecyl methacrylate and the methacrylic acid are grafted onto the epoxy resin under the initiation of the benzoyl peroxide; a proper amount of the dimethylethanolamine and the de-ionized water are added to regulate the pH (Potential of Hydrogen), so as to obtain the active oil-washing sand consolidating agent. The active sand consolidating agent provided by the invention can be rapidly cured at a temperature lower than 60 DEG C, and a coupling agent can also be used for enhancing the cohesive property of the resin and a surface of a sandstone, so that the strength of a resin consolidated matter is guaranteed; meanwhile, the active sand consolidating agent has an extremely high oil-absorption capability and the permeability of the consolidated sandstone is kept, so that a stratum structure is stabilized or an artificial borehole wall with certain strength and permeability is formed.

Description

technical field [0001] The invention belongs to the field of oilfield chemistry, and in particular relates to a new type of resin liquid sand-fixing agent capable of cementing the loose sandstone near the well wall under the condition of low temperature, medium-low salinity and water content during the oilfield exploitation process. During the production of sand-producing oil wells, the formation sand of loose sandstone or the gravel filled in the formation is cemented, thereby stabilizing the formation structure or forming an artificial well wall with a certain strength and permeability, and achieving the purpose of preventing formation sand production. Background technique [0002] With the deepening of reservoir development in each block of the oilfield, during the production process of the oilfield, due to the damage to the sandstone of the oil well due to construction operations or the loose cementation of the sandstone itself, the original pressure system of the formati...

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Problems solved by technology

[0003] In order to solve the problem of formation sand consolidation under the condition of low temperature, medium and low salinity and water content, and to overcome the problems of mechanical sand control after mechanical sand control operation, there are residues in the well, which will affect the later operation, and at the same time, the cost of workover is high. Start, research and develop new chemical sand control agents adapted to reservoir conditions

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