Solid chelate acid for augmented injection of water injection wells and preparation method thereof

A technology of chelating acid and water injection wells, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., which can solve the problems of increasing oilfield development costs, small plugging removal radius, and sand production near the wellbore, so as to overcome the phenomenon of excessive dissolution , expanding the radius of plugging removal, and the effect of small self-corrosion
CN109021950AActive Publication Date: 2018-12-18SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SHAANXI YOUBANG PETROLEUM ENG TECH CO LTD
Publication Date
2018-12-18

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Abstract

The invention discloses a solid chelate acid for the augmented injection of water injection wells and a preparation method thereof, which relate to the technical field of depressurization and augmented injection of water injection wells of oilfields. The solid chelate acid for the augmented injection of water injection wells consists ofis prepared from the following materials in percentage by weight: 30 to 40 percent of a main agent, 20 to 30 percent of an auxiliary agent, 10 to 15 percent of an intensifier, 3 to 8 percent of an activator, 2 to 3 percent of an inhibitor, 5 to 10 percent of a stabilizer and 15 to 30 percent of a binder. By adopting the invention, potential safety and environmental hazards in the process of transportation, storage and use in plugging removal by acidification, the slow release rate of acid liquor is greatly increased, the radius of plugging removal is broadened, plugging removal deep in a water injection well is benefittedfacilitated, and the effective rate of depressurization and augmented injection measures for water injection wells is increased.
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Description

technical field

[0001] The invention relates to a solid chelating acid, in particular to a solid chelating acid used for increasing injection of water injection wells and a preparation method thereof. The invention belongs to the technical field of reducing pressure and increasing injection of water injection wells in oil fields. Background technique

[0002] With the extension of oilfield development time, due to the reduction of formation energy, the production of oil wells decreases, and water injection development is required to maintain formation energy. In the water injection development, due to the clogging of mechanical impurities, scaling and bacterial corrosion products in the injected water, the water injection wells show high pressure under-injection. Water injection wells need to be deblocked. Currently, the commonly used deblocking agents are composed of acid liquid. Acid liquid is a dangerous chemical. During the transportation, storage and use of acid liquid...

Claims

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