Multi-system long-time antiscale agent for oil well

Abstract

The invention discloses a multi-system long-time antiscale agent for an oil well. The multi-system long-time antiscale agent is prepared from the following raw materials in parts by weight: 7 to 11 parts of fluoroboric acid, 3 to 5 parts of fatty alcohol-polyoxyethylene ether, 15 to 20 parts of hydroxy penta methylene phosphonic acid, 3 to 5 parts of hydrochloric acid, 2 to 4 parts of hydrofluoric acid, 0.05 to 0.06 part of vitamin C, 3 to 4 parts of methenamine, 0.001 to 0.002 part of sodium selenide aqueous solution, 15 to 25 parts of methyl alcohol, 8 to 12 parts of sodium gluconate, 6 to 8 parts of sodium ascorbate, 1 to 3 parts of ethydiaminedhephen acetic-Na, 15 to 25 parts of polyether polymeric chelating agent, 5 to 10 parts of emulsifier and 3 to 5 parts of stabilizer, wherein the emulsifier is sodium polyoxyethylene carboxylate, and the stabilizer is potassium polymaleate. The multi-system long-time antiscale agent has the effects of dispersion, solubilization, crystal distortion and electrostatic repulsion, and the multi-system long-time antiscale agent stays in stratum holes through absorption or a chemical reaction on stratum rock surfaces and is slowly released under the action of output liquid or injected water, so that a long-time antiscale effect is achieved, thereby increasing the liquid production capacity and the oil production capacity of the oil well and achieving the purposes of stable yield and increase yield.

Description

technical field [0001] The invention relates to the technical field of oil well anti-scaling, in particular to a multi-system long-acting anti-scaling agent for oil wells. Background technique [0002] After the oil field enters the water-cut period and is developed, due to the thermodynamic instability and chemical incompatibility of water, it often causes scaling problems in the wellbore of the oil well, the surface system and the water injection formation, which brings great harm to the production. Due to the influence of scaling, the liquid (oil) production of the oil well decreases, and the pipeline and heating furnace are blocked. At the same time, the scaling also increases the lifting operation of the oil well. In severe cases, the oil well is shut down or scrapped, resulting in economic losses. Scaling in the water injection formation can block the oil layer and reduce the oil recovery index, thereby affecting the development effect and economic benefits of the oil ...

AI Technical Summary

Problems solved by technology

[0002] After the oilfield enters the water-cut period and is developed, due to the thermodynamic instability and chemical incompatibility of water, it often causes scaling problems in the wellbore of the oil well, the surface system and the water injection formation, which brings great harm to the production.

Due to the influence of scaling, the production of oil (oil) in the oil well decreases, and the pipeline and heating furnace are blocked. At the same time, scaling also increases the lifting operation of the oil well. In severe cases, the oil well is shut down or scrapped, resulting in economic losses.

Scaling in the water injection formation can block the oil layer and reduce the oil recovery index, thus affecting the development effect and economic benefits of the oil field

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