Viscoelastic particle oil displacement agent with water plugging function

Abstract

The invention discloses a viscoelastic particle oil displacement agent with a water plugging function. The agent comprises, according to weight percentage, 15%-25% of acrylic acid; 10%-15% of acrylamide, 0.01-0.04% of a cross-linking agent and 0.03-0.06% of an initiator, and the method comprises the steps: uniformly mixing the components in water, heating to 60-70 DEG C, keeping the temperature constant for 2-3 hours, heating to 80-90 DEG C, keeping the temperature constant for 2-3 hours, adding 50-80% of silicon dioxide gel, and mixing and dispersing to obtain bead-shaped particles with different particle sizes. The viscoelastic particle oil displacement agent has a partially crosslinked and partially branched molecular structure; the oil displacement agent has certain viscoelasticity andcan be dispersed in water to form a heterogeneous suspension, the suspension is a flowable viscoelastic and deformable material, has good pumpability and injectability, and has better sweep efficiency and oil displacement efficiency for a strong heterogeneous oil layer.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a viscoelastic particle oil displacement agent with water blocking function. Background technique [0002] Usually used oil displacement agent is polymer aqueous solution (such as polyacrylamide aqueous solution) and surfactant, and surfactant can reduce oil-water interfacial tension, increase compatibility with crude oil at the same time, and then make oil displacement agent flow with the crude oil that is not easy to flow, to enhance oil recovery. [0003] When the oilfield development reaches a certain stage, under the condition of strong injection and strong production, the permeability of the high-permeability layer will become larger and larger, while the low-permeability layer will not change much, so the vertical heterogeneity will become larger and larger, resulting in oilfield The higher the water cut, the lower the recovery factor. For high...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the oil displacement agent has a low sweep coefficient for strongly heterogeneous oil layers and cannot effectively improve the oil displacement efficiency, and provides a viscoelastic particle oil displacement agent with water shutoff function , the viscoelastic particle oil displacement agent has a partially cross-linked and partially branched molecular structure, has a certain viscoelasticity, can be dispersed in water to form a heterogeneous suspension, and the suspension is a flowable viscoelastic and Deformable material, with good pumpability and injectability, has better sweep coefficient and oil displacement efficiency for strongly heterogeneous oil layers

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