Insoluble scale dispersing and unblocking system and use method thereof

Abstract

The invention discloses an indissolvable scale dispersing and unblocking system which is characterized in that a first slug is a cleaning solution and comprises diesel oil and limonene in a mass ratio of (6-10): 2; the first slug is a fatty alcohol-polyoxyethylene ether solution with the mass concentration of 2-6%, the second slug is a fatty alcohol-polyoxyethylene ether solution with the mass concentration of 0.4-0.6%, the third slug is a treating fluid with the mass concentration of 14-16%, and the treating fluid comprises the following components in parts by weight: 15-20 parts of phosphino hydrolytic polymaleic anhydride, 8-12 parts of potassium amino trimethylene phosphonate, 5-10 parts of tetrasodium glutamate diacetate, 2-6 parts of tripotassium citrate and 1-2 parts of sodium tartrate; and the fourth slug is a potassium chloride solution with the mass concentration of 0.8-1.2%. The invention discloses a use method of an indissolvable scale dispersing and unblocking system. The dispersion blocking remover has the beneficial effects that the permeation, stripping and dispersion capacities of the dispersion blocking remover for the insoluble scale are improved, efficient dispersion blocking removal is achieved, and the production level is improved.

Description

technical field [0001] The invention relates to the technical field of insoluble scale dispersion and plugging removal. More specifically, the present invention relates to an insoluble scale dispersing and blocking removing system and a method for using the same. Background technique [0002] In the process of oilfield production, oil wells often face various scaling problems, causing reservoir blockage, wellbore blockage and pump stuck, which seriously affects production and greatly reduces production. There are not many effective plugging methods for some insoluble composite scales in oil fields, mainly strong acid chemicals. However, there are problems. First, the insoluble composite scale is usually very stable, and its high density and high density make it difficult for the effective components of the unblocking chemicals to penetrate deeply and disperse the scale; The surface of the body is usually covered with oil scale, and it is difficult for the conventional desc...

AI Technical Summary

Problems solved by technology

However, there are problems. First, the insoluble complex scale is usually very stable, and its high density and high compactness make it difficult for the active ingredients of plugging removal chemicals to penetrate deeply and disperse the scale body; second, the coexistence of oil and water in the reservoir, the scale The surface of the body is usually covered with oil scale, and it is difficult for the conventional descaling system to directly contact and dissolve the scale body; thirdly, the liquid flow during the injection and flowback process of the deblocking agent will cause the formation cuttings to loosen and fall off, and subsequent deposition will cause secondary blockage

Therefore, the effect of the conventional chemical agent system is limited, and it is not enough to solve the problem of fouling and clogging of oil and water wells.

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