Self-growing gel dispersion active fluidity control system and fluid channeling control method for hypotonic-tight reservoir

Abstract

The invention relates to the field of oilfield development engineering, and discloses a self-growing gel dispersion active fluidity control system and a fluid channeling control method for a low-permeability-tight reservoir. The system contains 100 parts by weight of a self-growing gel dispersion and 0.15-0.6 part by weight of a surfactant, the self-growing gel dispersoid is prepared by shearing and grinding nano-reinforced chromium-aldehyde double-group cross-linked integral gel, and the preparation method of the nano-reinforced chromium-aldehyde double-group cross-linked integral gel comprises the following steps: adding a functional polymer, a phenolic resin cross-linking agent, an organic chromium cross-linking agent and a nano-reinforcer into water, mixing, and curing. The system can be simply and rapidly prepared, is easy for deep injection by adjusting the size of gel dispersion particles, is wide in action range, high in stability and long in effective period of action, can avoid reservoir pollution, and does not affect the liquid production capacity of the reservoir. The gel dispersion particles can achieve self-growth in the low-permeability-tight reservoir fractures, and the fracture fluid channeling control effect is enhanced.

Description

technical field [0001] The invention relates to the field of oilfield development engineering, in particular to a self-growing jelly dispersion active mobility control system and a channeling control method for low-permeability-tight reservoirs. Background technique [0002] As the "blood of industry", oil has irreplaceable significance to the development of the national economy. With the development of society and economy, the demand for oil consumption has been increasing. [0003] With the continuous deepening of oil and gas development and the sharp increase in the demand for oil and gas resources worldwide, the development of unconventional oil and gas resources has received much attention, especially the oil and gas resources in low-permeability-tight reservoirs have become the most realistic oil and gas resources in conventional oil and gas resources. Strategic succession of resources. Although my country has made continuous development and progress in the developme...

AI Technical Summary

Problems solved by technology

The technical bottleneck of the weak fluidity control ability of polymer microspheres is that its "physical accumulation only" control structure is unstable, especially when the fluid velocity in fractures is high, it is easier to be washed away, and the forces between particles and rock walls and between particles Weak, the flow control ability cannot be further improved

In addition, polymer microspheres are prepared by emulsion polymer production. The production process is complex and requires fine control, resulting in unstable product quality and high cost.

[0014] The current existing mobility control methods have injection difficulties in low-permeability-tight reservoirs; poor stability and short validity period; The shortcomings of weak mobility control ability and limited enhanced sweep are no longer applicable to the technical requirements of fluidity control and enhanced oil recovery in low-permeability-tight reservoirs.

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