Blocking removing solution applied to blocking removal of sandstones of water injection well and preparation method of blocking removing solution

A technology for well sandstone and plug removal, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of easy stripping, migration of solid phase particles, fast reaction rate of acid solution, damage to rock skeleton, etc.

Inactive Publication Date: 2018-09-25
河北峻极化工科技有限公司
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) Excessive acidification causes damage to the rock skeleton, and the solid phase particles are easily stripped and migrated, causing secondary damage to the formation;
[

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
  • Blocking removing solution applied to blocking removal of sandstones of water injection well and preparation method of blocking removing solution
  • Blocking removing solution applied to blocking removal of sandstones of water injection well and preparation method of blocking removing solution
  • Blocking removing solution applied to blocking removal of sandstones of water injection well and preparation method of blocking removing solution

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The present invention is applied to the plugging removal fluid for sandstone plugging removal of water injection wells, and its components and weight percentages are as follows:

[0017]

[0018] The multifunctional molecular inclusion agent is a mixture of β-cyclodextrin derivatives, cationic quaternary ammonium salts, sodium erythorbate, EDTA, citric acid, Mannich bases, and fluorocarbon surfactants.

[0019] Its preparation method is:

[0020] Water, industrial hydrochloric acid with a mass concentration of 30%, fluosilicic acid with a mass concentration of 40%, and a multifunctional molecular inclusion agent were mixed and stirred in sequence for 20 minutes to prepare a blockage-removing liquid with a retarding effect.

[0021] This product was applied to a water injection well of Sinopec. After the plugging removal measures, the daily water injection volume of the well was reduced from 15.2m 3 / d increased to 32.1m 3 / d, the injection pressure is reduced from ...

Embodiment 2

[0023] The present invention is applied to the plugging removal fluid for sandstone plugging removal of water injection wells, and its components and weight percentages are as follows:

[0024]

[0025] The multifunctional molecular inclusion agent is a mixture of β-cyclodextrin derivatives, cationic quaternary ammonium salts, sodium erythorbate, EDTA, citric acid, Mannich bases, and fluorocarbon surfactants.

[0026] Its preparation method is:

[0027] Water, industrial hydrochloric acid with a mass concentration of 30%, fluosilicic acid with a mass concentration of 40%, and a multifunctional molecular inclusion agent were mixed and stirred in sequence for 20 minutes to prepare a blockage-removing liquid with a retarding effect.

[0028] This product was applied to a water injection well of Sinopec. After the plugging removal measures, the daily water injection volume of the well was reduced from 5.6m 3 / d increased to 34.7m 3 / d, the injection pressure is reduced from 1...

Embodiment 3

[0030] The present invention is applied to the plugging removal fluid for sandstone plugging removal of water injection wells, and its components and weight percentages are as follows:

[0031]

[0032]

[0033] The multifunctional molecular inclusion agent is a mixture of β-cyclodextrin derivatives, cationic quaternary ammonium salts, sodium erythorbate, EDTA, citric acid, Mannich bases, and fluorocarbon surfactants.

[0034] Its preparation method is:

[0035] Water, industrial hydrochloric acid with a mass concentration of 30%, fluosilicic acid with a mass concentration of 40%, and a multifunctional molecular inclusion agent were mixed and stirred in sequence for 20 minutes to prepare a blockage-removing liquid with a retarding effect.

[0036] This product was applied to a water injection well of CNOOC. After the plugging removal measures, the daily water injection volume of the well increased from 109.3m3 / d to 586.1m3 / d, and the injection pressure decreased from 9MP...

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 discloses a blocking removing solution applied to blocking removal of sandstones of a water injection well and a preparation method of the blocking removing solution. The blocking removing solution is prepared from the following components in parts by weight: 30 to 50 parts of industrial hydrochloric acid (with the mass concentration of 30 percent), 0 to 15 parts of fluorosilicic acid (with the mass concentration of 40 percent), 10 to 20 parts of a multifunctional molecule inclusion agent and the balance of water; the preparation method comprises the following steps: firstly, adding the water, the industrial hydrochloric acid (with the mass concentration of 30 percent), the fluorosilicic acid (with the mass concentration of 40 percent) and the multifunctional molecule inclusion agent in sequence according to the ratio of all the components of the blocking removing solution applied to the blocking removal of the sandstones of the water injection well, uniformly mixing andcompounding to prepare the blocking removing solution. According to the blocking removing solution applied to the blocking removal of the sandstones of the water injection well and the preparation method of the blocking removing solution, disclosed by the invention, can meet the requirements of efficient corrosion of inorganic scales including calcium and magnesium scales, clay grains and the like; the blocking removing solution also has good speed slowing performance and realizes deep blocking removal.

Description

technical field [0001] The invention relates to the technical field of petroleum exploitation, in particular to a plugging removal fluid which is applied to sandstone plugging removal in water injection wells and has a retarding effect and a preparation method thereof. Background technique [0002] In the middle and later stages of water injection well development, due to the gradual increase of water injection pressure, the injection requirements cannot be met. Conventional acidification is generally used for treatment, but the following problems exist: [0003] (1) Excessive acidification causes damage to the rock skeleton, and the solid phase particles are easily stripped and migrated, causing secondary damage to the formation; [0004] (2) Repeated acidification makes the acidification period shorter; [0005] (3) The reaction rate of acid liquid is fast, and the ability to remove plugs in deep parts is poor. [0006] Therefore, how to design a plug-removing fluid that...

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
IPC IPC(8): C09K8/528
CPCC09K8/528
Inventor 黄霞张娟
Owner 河北峻极化工科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap