Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of composite acid for oil-water well in oil field and preparation method thereof

An oil-water well and compound acid technology, which is applied to drilling compositions, chemical instruments and methods, etc., can solve the problems of short acidification distance, large amount of acid solution, fast acid solution consumption, etc., so as to improve permeability and reduce Acidification speed, effect of reducing surface tension

Active Publication Date: 2022-04-26
胜利油田新海兴达实业集团有限责任公司
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The more commonly used acidizing plugging removal reagent is earth acid (hydrochloric acid mixed with hydrofluoric acid). However, earth acid has a fast acidification speed, and the acid solution is consumed quickly during operation, and the residual acid solution after the reaction will form precipitation again in the far-reaching formation. Therefore, when using conventional earth acid for acidification, there will be problems such as short acidification distance and large amount of acid solution during acidification.

Method used

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
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of composite acid for oil-water well in oil field and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] An oilfield oil-water well composite acid, the preparation method of which comprises the following steps:

[0023] Weigh half the amount of water into the mixing container, then add hydrochloric acid, boric acid, sulfamic acid, citric acid, acetic acid, aminotrimethylene phosphonic acid in sequence, and stir evenly at a speed of 100r / min to obtain mixture A; Diethylene glycol monobutyl ether and fluorine-containing surfactant, after mixing evenly, add the macromolecular complex FC, Span 80 in turn, and then add the rest of the water, stir at a temperature of 60°C at a speed of 450r / min homogeneous, stand to defoam, and obtain the complex acid of the oil-water well in the oil field.

[0024] Among them, in terms of weight percentage, it contains 5% hydrochloric acid, 5% boric acid, 2% acetic acid, 2% citric acid, 4% sulfamic acid, 5% aminotrimethylene phosphonic acid, 8% macromolecular complex FC, and Span 80 4%, SIFAST@SF-333 6%, diethylene glycol monobutyl ether 2%, w...

Embodiment 2

[0027] An oilfield oil-water well composite acid, the preparation method of which comprises the following steps:

[0028] Weigh half the amount of water into the mixing container, then add hydrochloric acid, boric acid, sulfamic acid, citric acid, acetic acid, aminotrimethylene phosphonic acid in sequence, and stir evenly at a speed of 100r / min to obtain mixture A; Diethylene glycol monobutyl ether and fluorine-containing surfactant, after mixing evenly, add the macromolecular complex FC, Span 80 in turn, and then add the rest of the water, stir at a temperature of 60°C at a speed of 450r / min homogeneous, stand to defoam, and obtain the complex acid of the oil-water well in the oil field.

[0029] Among them, in terms of weight percentage, it contains 7% hydrochloric acid, 3% boric acid, 2% acetic acid, 2% citric acid, 2% sulfamic acid, 9% aminotrimethylene phosphonic acid, 10% macromolecular complex FC, and Span 80 5%, SIFAST@SF-333 7%, diethylene glycol monobutyl ether 4%, ...

Embodiment 3

[0032] An oilfield oil-water well composite acid, the preparation method of which comprises the following steps:

[0033] Weigh half the amount of water into the mixing container, then add hydrochloric acid, boric acid, sulfamic acid, citric acid, acetic acid, aminotrimethylene phosphonic acid in sequence, and stir evenly at a speed of 100r / min to obtain mixture A; Diethylene glycol monobutyl ether and fluorine-containing surfactant, after mixing evenly, add the macromolecular complex FC, Span 80 in turn, and then add the rest of the water, stir at a temperature of 60°C at a speed of 450r / min homogeneous, stand to defoam, and obtain the complex acid of the oil-water well in the oil field.

[0034] Wherein, by weight percentage, the compound acid contains 15% of hydrochloric acid, 2% of boric acid, 1% of acetic acid, 1% of citric acid, 2% of sulfamic acid, 4% of aminotrimethylene phosphonic acid, and 15% of macromolecular complex FC , Span 80 8%, SIFAST@SF-333 10%, diethylene ...

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

PUM

No PUM Login to View More

Abstract

The invention relates to the technical field of chemical descaling and dredging reagents for oil fields, in particular to a compound acid used for oil and water wells in oil fields and a preparation method thereof. The present invention adopts a specific preparation method to prepare the macromolecular compound FC, and adds Span 80 and its compounding synergy, and scientifically adjusts the types of raw materials and their dosage / ratio in the compound acid to obtain a compound acid composition for oilfield oil and water wells with excellent performance . The compound acid of the present invention not only has excellent descaling and plugging removal effects, but also has a relatively low acidizing speed, so as to avoid excessive consumption of acid solution in the initial stage of acidizing operation, and can meet the operating requirements of acidizing far-reaching formations.

Description

technical field [0001] The invention relates to the technical field of chemical descaling and dredging reagents for oil fields, in particular to a compound acid used for oil and water wells in oil fields and a preparation method thereof. Background technique [0002] During the long-term development of oil fields, due to the influence of factors such as the increase of formation pressure and temperature, the incompatibility of injected water and external fluids, and the accumulation of bacterial metabolites, organic matter such as inorganic salts, iron compounds, biological slimes, and polymers and inorganic clogging. In actual operation, as the injected water continues to advance, the seepage resistance increases rapidly, the injection pressure rises rapidly, and the water injection volume decreases rapidly, so that the oilfield productivity cannot be effectively improved. For the above-mentioned blockages, the commonly used plugging removal method at present is acidificat...

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

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/524C09K8/528
CPCC09K8/74C09K8/524C09K8/528
Inventor 任沼琦贺金辉李向达王松
Owner 胜利油田新海兴达实业集团有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com