Preparation method of high permeability fast water injection well scale remover

Abstract

Belonging to the technical field of scale removers, the invention discloses a preparation method of a high permeability fast water injection well scale remover. The method includes: firstly utilizing phosphotungstic acid to prepare a catalyst, then reacting the catalyst with glucosamine hydrochloride, adjusting pH and performing other processes to obtain an acidic complexing agent for standby use, using polyoxyethylene aliphatate, octodecyl betaine and other substances to prepare a composite permeation lubricant, and mixing the composite permeation lubricant with the acidic complexing agent, organic acid and other substances, thus obtaining the high permeability fast water injection well scale remover. The scale remover prepared by the method provided by the invention can enhance the dirt dissolution, loosening and falling rate, after the prepared metal complexing agent is added into the scale remover, the scale remover can permeate into a bonding surface of limescale and metal to undergo double decomposition with dirt, the dirt adhesion to the metal contact surface can be reduced so as to make the oil dirt fall off. The scale remover has good treatment effect on inorganic dirt, but also can remove organic dirt, and has the advantages of low construction labor intensity, short construction time, and small corrosion.

Description

technical field [0001] The invention discloses a preparation method of a high-permeability rapid water injection well descaling agent, which belongs to the technical field of descaling agents. Background technique [0002] In the process of oilfield water injection development, water injection wells are usually used to inject water into the oil reservoir to maintain or restore the pressure of the oil layer, so that the oil reservoir has a strong driving force, so as to increase the production speed and recovery rate of the oil reservoir. However, during the use of water injection wells, due to corrosion, precipitation, gelling, carbon deposition, bacterial reproduction, etc., it is easy to cause scaling on the inner wall of the pipe string. The deposition of scale will cause local electrochemical corrosion of the pipe string and reduce the flow cross section Area, increase hydraulic resistance and transport energy, block oil well channels, thereby reducing oil well productio...

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: aiming at the problem that the current chemical descaling agent has a long descaling cycle, low descaling efficiency, strong corrosion to pipelines, good effect on inorganic scales, but difficult to remove organic scales, a method of using The descaling agent is prepared by adding the acidic complexing agent to the osmotic softener. In the present invention, the catalyst is prepared by using phosphotungstic acid first, and then the acidic complexing agent is prepared by using the catalyst and glucosamine hydrochloride through processes such as reaction and pH adjustment. For standby, use polyoxyethylene fatty acid ester, octadecyl dimethyl betaine and other substances to prepare composite osmotic lubricant, and mix it with acidic complexing agent, organic acid and other substances to obtain high-permeability rapid water injection well Descaling agent, the descaling agent prepared by the present invention can increase the rate of dissolution, loosening and shedding of dirt, and the prepared metal complexing agent is added to the descaling agent, which can penetrate into the bonding surface of scale and metal, and undergo metathesis with dirt , reduce the adhesion between the dirt and the metal contact surface and make the old scale fall off, not only has a good treatment effect on the inorganic scale, but also can remove the organic scale, the construction labor intensity is low, the construction time is short, and the corrosion is small