Activated anti-swelling shrinkage agent and application thereof

Abstract

The invention provides an activated anti-swelling shrinkage agent and application thereof. The structural formula of the activated anti-swelling shrinkage agent is as follows: R1R2R3N<+>Y1N<+>R4R5R6.X<2->, R1R2R3N<+>Y2N<+>(R7)(R8)Y3N<+>R4R5R6X<3->, wherein R1 to R8 refer to hydrogen, alkane radical, aromatic alkane radical, polyoxyethylene radical, polyoxypropylene radical, polyoxyethylene / propylene segmented copolymer, poly-glycosidic bond and various substituent groups thereof respectively and independently; X<-> is Cl<->, Br<->, I<->, RCO3<->, COO<->, RSO3<->, RSO4<->, and RPO4<-> atoms, and R is H, alkyl or substituent alkyl independently; Y1 to Y3 are -(CH2)n- (n=1-10), -(CH2)n-CH=CH-(CH2)m- (n+m=8), -(Ph)n- (n=1-4), -(CH2)mO(CH2)n- (m+n<10), -(CH2)n-O-(EO)m- (m+n<10), -(CH2)n-O-(PO)m- (m+n<10) and various substituent groups. The activated anti-swelling shrinkage agent is used for protection of sensitive reservoir with high clay content, can be used independently, and can also be used as an additive to be used in oil-water well work.

Description

Technical field: [0001] The invention relates to the technical field of oil field development, in particular to an active clay anti-swelling and shrinking agent for oil layer protection. Background technique: [0002] For reservoirs containing sensitive minerals, the injection of external fluids will cause the continuous expansion of clay minerals in the reservoirs, thereby reducing the oil-water seepage capacity of the reservoirs. In all kinds of oilfield development operations, reservoir sensitivity damage has seriously affected the oilfield development effect. If no measures are taken, with the continuous intervention of external fluids, the oil-water seepage channel will eventually be blocked. Aiming at the problem of water-sensitive damage to reservoirs, an active anti-swelling and shrinking agent was invented. The invention can not only prevent the expansion of the formation clay by external fluids and reduce the damage to the formation, but also shrink and expand the...

AI Technical Summary

Problems solved by technology

[0010] The limitation of the first six inventions mentioned in the article is that there is no shrinkage and swelling effect, and additional operational measures are required for the water-sensitive damage that has already occurred, which not only increases new reservoir damage but also reduces economic benefits

However, although the 102391853A invention has shrinkage and swelling effect, it has no surface activity. When it is used in low-permeability reservoirs or reservoirs with water-lock damage, surfactants need to be injected at the same time, which increases operating costs and workload.

Although the traditional surface active anti-swelling agent has surface activity, the first problem is that it does not have shrinkage and swelling effect, and the second problem is that it will cause wetting reversal, so it cannot be used in oil well operations

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