Intramolecular Cr3+ cross-linked polymer gel and its preparation method

Abstract

The invention relates to intermolecular Cr 3+ cross-linked polymer gel and a production process. The intermolecular Cr 3+ cross-linked polymer gel comprises the following components which are matched according to mass concentration, wherein partial hydrolysis polyacrylamide is used as host crystal whose concentration range is 0.04%-0.12 %, organic chromium is used as cross linking agent in which the mass concentration of Cr 3+ is calculated based on the mass concentration of polymer, wherein polymer: Cr 3+ = 40:1-100:1, and oil-field produced water or source water is used as solvent. The polymer gel has the characteristics of low viscosity, rapid gel forming speed, large flow resistance and controllable flow ability, which can be used to adjust water injection profile of a water injectionwell in oil fields which are driven by water, and simultaneously expresses excellent technology and economy.

Description

A kind of intramolecular Cr3+ cross-linked polymer gel and its preparation method Technical field: The invention relates to an auxiliary agent for adjusting the liquid absorption profile of an oilfield water injection well or for oil displacement, in particular to an intramolecular Cr3+ cross-linked polymer gel and a preparation method thereof. Background technique: With the continuous increase of comprehensive water cut in domestic waterflood development oilfields, how to reduce the inefficient and ineffective circulation of injected water in high permeability layers or large pores, and expand the swept volume of medium and low permeability layers has become a major technical problem in the process of oilfield development . At present, the plugging agents commonly used in oilfields to adjust the liquid absorption profile of water injection wells (referred to as profile control agents) mainly include Al3+, Cr3+ and compound ions as cross-linking polymer gels and solid part...

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Problems solved by technology

Compared with the indoor conditions, the preparation and gelation process of the mine is restricted by factors such as the "complex chemical environment" of the reservoir, "small and poorly continuous pore space environment" and "flow and shear action", resulting in the accumulation of oil in the reservoir. The large-scale "intermolecular" cross-linking reaction cannot be realized by the polymer molecules, and the "intra-molecular" cross-linking reaction has become extremely difficult, which is the root cause of the poor results of the existing polymer gel field tests

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