a co 2 Corrosion inhibitor and scale remover for oil displacement, preparation method and application method

A corrosion inhibition and scale removal technology, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve problems such as pipe string corrosion, limited efficiency, and affecting the service life of the pipe string, oil field production efficiency, etc.
CN109609110BActive Publication Date: 2021-03-09PETROCHINA CO LTD
8 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2021-03-09
Patent Text Reader

Abstract

The present invention provides a CO 2 Corrosion inhibitor and scale remover for oil flooding, preparation method and use method, composed of the following substances in weight percentage: benzoic acid thioureido imidazoline 17-21%, benzoic acid phosphate ester thioureido imidazoline 1-3%, Isopropanol 9‑13%, acetic acid 7‑11%, polyepoxysuccinate sodium 11‑15%, OP‑10 3‑7%, quinoline quaternary ammonium salt 12‑16%, polystyrene sulfonate sodium 3-7%, disodium edetate 5-9%, sodium diethylenetriaminepentaacetate 11-15%, N-dodecylmethylene bis-secondary ammonium salt 2-6%, the balance is water. To overcome the existing corrosion inhibitors and scale inhibitors usually have a single corrosion and anti-corrosion effect and scale inhibition effect, while effectively preventing the occurrence of scaling in oilfield water, it can also effectively inhibit corrosion, especially for The barium-strontium scale formed by the formation water with high barium-strontium ions has better scale removal effect.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention belongs to the technical field of oilfield water treatment, in particular to a CO 2 Corrosion inhibitor and scale remover for oil displacement, preparation method and application method. Background technique

[0002] At present, more than 70% of my country's newly discovered and discovered undeveloped crude oil reserves are low-permeability oil fields and hard-to-recover reserves. Such oil fields are difficult to develop economically and effectively, and the oil recovery rate is low. Field practice at home and abroad proves that CO 2 Oil flooding can greatly increase the recovery rate of low-permeability oilfields and the production rate of hard-to-recover reserves. Miscible oil flooding can increase oil recovery by more than 10%, and immiscible oil flooding can increase oil recovery by more than 7%.

[0003] CO 2 Water injection is used for development before flooding, since the formation water is CaCl 2 Water type, high average sali...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More