Gel injection type profile control agent

Abstract

The present invention provides a gel injection type profile control agent, which comprises: acrylamide, an initiator, a cross-linking agent, a retarder and a buffer agent, wherein the acrylamide concentration is 3.5-5 g / L, the initiator concentration is 0.008-0.02 g / L, the cross-linking agent concentration is 0.015-0.03 g / L, the retarder concentration is 0-40 mg / L, and the buffer agent concentration is 0-0.6 g / L. The gel injection type profile control agent has the ultra low initial viscosity, and can form the continuous gel with the adjustable cross-linking viscosity in the target stratum according to the design scheme under different stratum permeabilities, different stratum temperatures, different mineralization degrees, and different well completion manners, such that purposes of sweeping volume expansion and recovery efficiency increase can be achieved through adjusting the water absorption profile of the water well.

Description

technical field [0001] The invention belongs to the field of profile control agents for oil fields, in particular to an injection gel type profile control agent. Background technique [0002] In oilfield water flooding, after decades of water injection development, medium and high permeability layers appeared in some parts of the oil layer, resulting in a large amount of injected water ineffective circulation, reduced recovery, and poor water injection effect. Profile control is to inject the profile control agent into the high-permeability layer in the oil layer to reduce the water absorption capacity of the high-permeability layer, so that the water can be injected into the profile in a balanced manner. Due to the high initial viscosity of the profile control agent currently used, the profile control agent enters the non-profile control layer, and then pollutes the non-plugging part. Because the profile control agent enters the non-profile control layer in large quantities...

AI Technical Summary

Problems solved by technology

Due to the high initial viscosity of the profile control agent currently used, the profile control agent enters the non-profile control layer, and then pollutes the non-plugging part. Because the profile control agent enters the non-profile control layer in large quantities, the injection volume and injection ratio of the target layer The profile control radius is small, and the effective period of profile control is short, which affects the effect of profile control.