Blowhole plugging agent for low-temperature oil layer, preparation method and application method thereof

Abstract

The present application relates to the technical field of petroleum exploitation, in particular to a low-temperature oil layer blasthole plugging agent, its preparation method and its use method. The blast hole plugging agent for low-temperature oil layer comprises 40wt%-50wt% of the first component, 25wt%-35wt% of the second component and 18wt%-35wt% of the third component, wherein the first component comprises methyl propylene glycol , neopentyl glycol, a copolymer formed of purified terephthalic acid and lauric acid, higher alcohols, fly ash and chopped fibers, the particle size of the copolymer is less than 0.1mm; the second component includes hexafluoro isopropanol, water and triisocyanate, the third component is a microsphere particle, the shell layer of the microsphere particle is a modified N-isopropylacrylamide polymer, and the core material of the microsphere particle is Calcium oxide, wherein the weight of calcium oxide accounts for more than 40% of the weight of the microsphere particles. By adding chopped fibers to the polyester structure, the strength of the formed plugging layer is enhanced, and the wellbore will not be plugged after plugging. It is suitable for oil layer plugging at a temperature of 30°C-70°C.

Description

Low temperature oil layer blasthole plugging agent, its preparation method and using method technical field The application relates to the technical field of petroleum exploitation, in particular, to a kind of low-temperature oil layer blasthole plugging agent, its preparation method and how to use it. Background technique After years of development in the oil field, especially after entering the ultra-high water cut period, on the one hand, there are many oil well shot formations, On the other hand, there is also the problem of many casing damage. At the same time, due to the long-term water injection However, the remaining oil saturation of the high permeability layer decreases, and the utilization value decreases. Therefore, some high permeability layers need to be sealed. At the same time, in In the work of filling holes and changing layers, due to errors in electrical measurement interpretation and perforation errors, misfired water layers also occur from tim...

AI Technical Summary

Problems solved by technology

[0003] The chemical plugging method currently used is mainly to inject a plugging agent into the target layer to seal off the periphery of the blast hole. The currently used plugging agent is mainly cement. The current plugging agent is more suitable for oil layers with a temperature of 50-90°C, but For oil reservoirs with temperatures below 50°C, there is no suitable blasthole plugging agent