Decompression and augmented injection agent for water injection wells and preparation method thereof

Abstract

The invention relates to the technical field of oilfield exploitation, in particular to a decompression and augmented injection agent for water injection wells and a preparation method thereof. The decompression and augmented injection agent comprises the following raw materials by weight: 30-60 parts of an organosilicon surfactant, 10-20 parts of polyethylene glycol, and 5-15 parts of triethanolamine. Compared with traditional oil-displacement surfactants, the decompression and augmented injection agent for water injection wells provided by the invention has the characteristics of simple composition, low self surface tension, strong ability of reducing oil-water interfacial tension, and strong wettability. Also, the preparation method is simple, the preparation cost is low, and the prepared decompression and augmented injection agent for water injection wells has good practical application effect, and has important significance for promoting oil reservoir water-flooding development.

Description

technical field [0001] The invention relates to the technical field of oil field exploitation, in particular to a pressure-reducing and injection-increasing agent for water injection wells and a preparation method thereof. Background technique [0002] Due to poor reservoir physical properties, low-permeability reservoirs are generally characterized by high initial production and rapid decline in the later stage. During the development process, it has always been "no injection and no production", and conventional production and injection measures are ineffective. Formation energy is seriously insufficient, and most blocks are in the development stage of low oil recovery rate, low recovery degree, and medium-low water cut. Therefore, the difficulty of replenishing energy has seriously restricted the effective development of low-permeability oilfields. The water injection development of low permeability reservoirs mainly has the following three problems: first, due to the poor...

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Problems solved by technology

[0002] Due to poor reservoir physical properties, low-permeability reservoirs are generally characterized by high initial production and rapid decline in the later stage. During the development process, it has always been "no injection and no production", and conventional production and injection measures are ineffective. Formation energy is seriously insufficient, and most blocks are in the development stage of low oil recovery rate, low recovery degree, and medium-low water cut, so the difficulty of replenishing energy has seriously restricted the effective development of low-permeability oilfields

The water injection development of low permeability reservoirs mainly has the following three problems: first, due to the poor conductivity of the reservoir, the start-up pressure of water injection is high, the seepage resistance is large, and the water absorption capacity is low; The pressure is suppressed, forming a high-pressure area, which leads to a decrease in the water absorption capacity of the formation, and the water injection pressure continues to rise; third, the oil well production rate is low, the pump hanging depth is large, the ground mechanical mining equipment and water injection matching are difficult, and the system efficiency is low

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