Emulsion type low-temperature sand consolidation agent and preparation method and application thereof

Abstract

The invention relates to an emulsion type low-temperature sand consolidation agent and a preparation method and application thereof. The emulsion type low-temperature sand consolidation agent is characterized in that an oil-in-water type Pickering emulsion is prepared from a water phase, an oil phase and an emulsifying stabilizer; the emulsifying stabilizer is dispersed in an interface of the water phase and the oil phase; the water phase is prepared from an adhesive, a curing agent and a coupling agent. The emulsion type low-temperature sand consolidation agent has the advantages that the sand prevention requirement of low-temperature stratums can be met, the high temperature-resistant characteristic is realized, and the good water-resistant, oil-resistant, alkaline-resistant and salt-resistant properties are realized; after the resin in the emulsifier is cured, the oil phase in the emulsion system is also used as a pore expansion agent, so that the good permeability of the stratum isguaranteed, and the damage to the stratum is little; the emulsion type low-temperature sand consolidation agent is suitable for the secondary sand prevention of common straight wells, large-inclination wells and irregular well holes after failure of chemical sand prevention or mechanical sand prevention, and the application range of sand prevention is broad.

Description

technical field [0001] The invention relates to an emulsion-type low-temperature sand-fixing agent, a preparation method and application thereof, and belongs to the technical field of oilfield chemical sand control. Background technique [0002] my country's sandstone reservoirs are widely distributed and rich in reserves. In the production process of oil and gas wells, sand production is very harmful. It will not only cause wear to the production pipe rod, but also cause sand to bury the oil layer or wellbore sand plugging. In addition, the formation deficit caused by a large number of sand production is easy Cause formation subsidence, casing rupture and deformation, and even make the oil well scrapped. Sand control technologies commonly used at home and abroad include mechanical sand control and chemical sand control. There is no residue in the well after chemical sand control construction, and it can fundamentally consolidate sand particles, which is widely used. At p...

AI Technical Summary

Problems solved by technology

Although this invention can fix sand in the formation, due to the granular materials such as cement and sodium bentonite, it cannot realize the secondary sand control of oil wells that already have mechanical sand control tools (such as wire-wrapped screens).

[0007] In summary, the current resin sand consolidation agent has the following defects: 1), it is easy to solidify at low temperature, and the sand control for filling the vacant formation has already solidified before being injected into the formation, so it cannot be directly injected into the formation for formation sand consolidation; 2) The compressive strength of the cemented core is low, which cannot meet the requirements of high fluid production and polymer concentration for sand consolidation during fracturing with a large amount of sand, resulting in sand ejection in some fracturing wells; 3) It is easy to cause mechanical sand control tools (such as downhole screens) tube) clogging

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