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

High-viscosity strong-corrosion acid liquid system for low-permeability sandstone oil reservoir

A high-viscosity technology for sandstone reservoirs, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of reduced production, increased production and increased injection, unsatisfactory effects of increased production, and increased scaling caused by reservoir blockages. To achieve the effect of increasing the effective distance

Inactive Publication Date: 2020-02-14
XI'AN PETROLEUM UNIVERSITY
View PDF1 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, judging from the effects of acidification and plugging removal measures, the effect of increasing production and increasing injection is not ideal. It is not that the effect of acid solution on plugging removal is poor, but the main reason is the phenomenon of "fingering". Instead, enter the high-permeability layer with low seepage resistance and improve its matrix. The blockage cannot be completely removed, and the blockage in the reservoir will aggravate scaling and reduce production, thereby shortening the effective period of acidification measures

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
  • High-viscosity strong-corrosion acid liquid system for low-permeability sandstone oil reservoir
  • High-viscosity strong-corrosion acid liquid system for low-permeability sandstone oil reservoir
  • High-viscosity strong-corrosion acid liquid system for low-permeability sandstone oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A low-permeability sandstone reservoir high-viscosity strong corrosion acid solution system, comprising:

[0032] 6% hydrochloric acid, 1% betaine, 4% enhancer, 0.05% citric acid, 0.5% ammonium chloride, 0.5% corrosion inhibitor, 0.1% drainage aid, 0.05% demulsifier, the balance is water, the above groups The sum of the points is 100%;

[0033] The enhancer is a JD-30B enhancer;

[0034] Described corrosion inhibitor is sodium nitrate;

[0035] The drainage aid is polyoxyethylene fatty acid ester;

[0036] Described demulsifier is demulsifier MQ801.

Embodiment 2

[0038] A low-permeability sandstone reservoir high-viscosity strong corrosion acid solution system, comprising:

[0039] 12% hydrochloric acid, 3% betaine, 8% enhancer, 0.2% citric acid, 2% ammonium chloride, 2% corrosion inhibitor, 0.4% drainage aid, 0.2% demulsifier, the balance is water, the above groups The sum of the points is 100%;

[0040] The enhancer is a JD-30B enhancer;

[0041] The corrosion inhibitor is potassium fluoride;

[0042] The drainage aid is polyoxyethylene alkylamine;

[0043] Described demulsifier is demulsifier MQ801.

Embodiment 3

[0045] A low-permeability sandstone reservoir high-viscosity strong corrosion acid solution system, comprising:

[0046] 8%% hydrochloric acid, 1% betaine, 5% JD-30B enhancer, 0.05% citric acid, 0.5% ammonium chloride, 0.5% sodium nitrate, 0.2% polyoxyethylene alkylamide, 0.05% demulsifier MQ801, the rest The amount is water, and the sum of the above components is 100%.

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

PropertyMeasurementUnit
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a high-viscosity strong-corrosion acid liquid system for a low-permeability sandstone oil reservoir. The system comprises the following components in percentage by mass: 6-12%of hydrochloric acid, 1-3% of betaine, 4-8% of a reinforcing agent, 0.05-0.2% of citric acid, 0.5-2% of ammonium chloride, 0.5-2% of a corrosion inhibitor, 0.1-0.4% of a cleanup additive, 0.05-0.2% ofa demulsifier and the balance of water, wherein the sum of the components is 100%. During acidification of the acid liquid system, rise of the viscosity of the acid liquid reduces the filtration lossof the acid liquid, more fresh acid is forced to enter the deep part of a stratum, the effective action distance of the acid liquid is increased, and after acidification is finished, a high-viscosityfluid is automatically broken into a low-viscosity fluid when meeting crude oil in the stratum, so that the stratum is not subjected to secondary damage.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, in particular to a high-viscosity and strong-corrosion acid liquid system for low-permeability sandstone reservoirs. Background technique [0002] With the increase of oil field development, the increase of water flooding energy, and the fracturing process and the water flooding process may cause some damage to the reservoir, which will bring some new problems in the long-term production of oil wells, such as In the process of water flooding, the migration of fine sand bodies in the formation often blocks the oil outlet channels, and formation fouling pollutes the oil outlet channels, resulting in blockage and pollution of the oil outlet channels. For these reasons, the skin factor of oil wells increases, resulting in a reduction in the production of some oil wells. [0003] For this reason, it is necessary to acidify oil-bearing reservoirs (fractured sandstone reservoirs),...

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): C09K8/74
CPCC09K8/74
Inventor 黄兴薛俊杰雷博
Owner XI'AN PETROLEUM UNIVERSITY
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