Bionic nano plugging agent for drilling fluid and preparation method thereof

Abstract

The invention relates to a bionic nanometer blocking agent for drilling fluid and a preparation method thereof. The bionic nanometer blocking agent is prepared from the following raw materials in parts by weight: 60 to 70 parts of distilled water, 1 to 2 parts of 2-acrylamide-2-methylpropanesulfonic acid, 20 to 30 parts of lactic acid, 5 to 10 parts of cross-linking agent, 0.7 to 1.5 parts of nanometer titania, 0.7 to 1.5 parts of molecular weight regulator, 0.1 to 0.5 part of potassium persulfate and 0.2 to 0.5 part of sodium hydroxide. The cross-linking agent is one of ethylene glycol dimethacrylate, polyethylene glycol and trimethylolpropane; the molecular weight regulator is isooctyl 3-mercaptopropionate. The preparation method comprises the following process steps of preparing alkyl solution; preparing titanium-based solution; preparing the bionic nanometer blocking agent. The bionic nanometer blocking agent for the drilling fluid, which is disclosed by the invention, solves the problems of shale hydration and extraneous water erosion in the existing drilling process; meanwhile, the bionic nanometer blocking agent has high biodegradability, so that pollution to a reservoir is effectively reduced.

Description

technical field [0001] The invention relates to a petroleum drilling fluid additive, in particular to a bionic nanometer plugging agent for drilling fluid. The invention also relates to a preparation method of the biomimetic nano plugging agent for drilling fluid. Background technique [0002] During the drilling of oil and gas wells, due to the poor permeability of shale when drilling into shale, the pores are rich in clay-rich matrix, which is easy to hydrate and expand. In addition, the drilling fluid easily invades the formation along shale throats and micro-fractures. It leads to the propagation and expansion of micro-fractures, resulting in the instability of the well wall. Strengthening the plugging of micropores and microfractures by drilling fluid is one of the key measures to solve the instability of shale wellbore. Existing drilling fluid systems can only seal pores and fractures with a size of micron and above, but are not effective in sealing nanoscale pores a...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a biomimetic nano-sealing agent for drilling fluid, which can solve the problems of shale hydration and external water erosion in the current drilling process, and at the same time, the biomimetic nano-sealing agent has strong Biodegradability, can effectively reduce the pollution to the reservoir

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