Micromolecular heavy oil viscosity reduction polymer and preparation method thereof

Abstract

The invention discloses a micromolecular thick oil viscosity reduction polymer and a preparation method thereof. The micromolecular thick oil viscosity reduction polymer comprises the following raw material components: 10 wt.% to 20 wt.% of an acrylamide (AM) monomer, 1 wt.% to 10 wt.% of a sodium acrylate monomer, 1 wt.% to 3 wt.% of a hydrophobic monomer, 1 wt.% to 3 wt.% of a temperature-resistant monomer, 0.5 wt.% to 2.5 wt.% of a surface active monomer, 0.7 wt.% to 2.5 wt.% of a chain transfer agent, 0.08 wt.% to 2 wt.% of an initiator and the balance being water. The micromolecular thick / oil viscosity reduction polymer has quick dissolving performance and good injection performance, can emulsify thick oil, has oil displacement and profile control performance at the same time, and canbe suitable for thick oil recovery of offshore oil reservoirs and low-permeability oil reservoirs.

Description

technical field [0001] The invention relates to the technical field of heavy oil viscosity-reducing agents, in particular to a small-molecule heavy-oil viscosity-reducing polymer suitable for offshore / low-permeability heavy oil reservoirs and a preparation method thereof. Background technique [0002] Due to the declining recoverable reserves and production of conventional crude oil and increasing production costs, the exploitation of heavy oil reservoirs has received more and more attention. The high density and high viscosity of heavy oil make its exploitation more difficult, so viscosity reduction technology must be used to increase its fluidity in the production of heavy oil, so as to improve the efficiency of heavy oil production. Viscosity reduction methods for heavy oil mainly include thermal viscosity reduction, thinning and chemical viscosity reduction, etc. Among them, chemical viscosity reducers are widely used due to the advantages of less pollution, less dosage...

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Problems solved by technology

[0005] Aiming at the problem that conventional heavy oil viscosity reducers cannot have both good emulsification performance and high-efficiency control and displacement performance and the stringent requirements for polymer molecular weight in offshore / low-permeability reservoirs, the purpose of the present invention is to provide a suitable for offshore / low-permeability oil A small-molecule heavy oil viscosity-reducing polymer and its preparation method. The small-molecule heavy-oil viscosity-reducing polymer can not only emulsify heavy oil, but also have high-efficiency control and displacement performance. At the same time, the small molecule structure improves its dissolution rate and injection property. Improvement, suitable for offshore reservoirs and low permeability reservoirs

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