A kind of gel composition and its nitrogen foam gel composite temporary plugging agent

Abstract

The invention provides a gel composition and a nitrogen-foamed gel composite temporary plugging agent containing the same. The gel composition comprises the following components in percentage by mass: 1.0% of partially hydrolyzed polyacrylamide, 1.5% of formaldehyde, 0.5% of hydroquinone and the balance of water. The nitrogen-foamed gel composite temporary plugging agent comprises nitrogen and foamed gel, wherein the foamed gel is a mixture of the gel composition and a high-temperature-resistant foaming agent; and the volume ratio of the nitrogen to the foamed gel is (40-60):1. The invention also provides a coupled internal / external swirl foam generator which can be used as a facility for preparing the nitrogen-foamed gel composite temporary plugging agent. The invention also provides a method for inhibiting high-throughput-frequency well steam channeling interference of thick oil, which has the characteristics of small formation damage, strong selectivity for measures and the like and has the effect of gas energization.

Description

technical field [0001] The invention relates to a gel composition and a nitrogen foam gel composite temporary plugging agent containing the same, belonging to the technical field of petroleum exploitation. Background technique [0002] Heavy crude oil has high viscosity and poor fluidity; the heterogeneity of reservoir development leads to uneven production between layers, layers and planes, especially with the increase of throughput rounds and the close distance between wells and horizontal wells. The uneven production is further aggravated, and steam channeling channels are formed between wells, which affects the production effect. And at present, the huff and puff wells generally enter the medium-to-high cycle, the formation pressure drops sharply, and the contradiction between cycle-to-cycle decline is prominent; medium-to-high cycle oil well casing damage is common, and the implementation of measures is limited. [0003] At present, in view of the contradictions in the...

AI Technical Summary

Problems solved by technology

However, as the oil well enters high rounds of huff and puff, limited by the reservoir conditions and the plugging agent itself, the disadvantages of the application of the above measures are becoming more and more obvious

Selective injection of heavy oil is seriously restricted by well conditions, and it cannot solve the problem of peaceful and contradictory contradictions in layers

High-temperature temporary plugging profile control technologies mainly include granular profile control agents, gel-type profile control agents, and foam-type profile control agents with organic particles as the main agent. Granular profile control agents have poor fluidity, small action radius, and formation damage. Big problem, it is not suitable for casing wells and oil wells with screen completion; gel-type profile control agent has the problem of poor temperature resistance and is easy to be broken by steam; foam profile control has the defect of weak ground foam profile control effect , not applicable to oil wells that have formed steam channeling channels

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