Visco-elastic surfactant acidizing liquid

A technology of surfactant and acidizing fluid, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as difficult to achieve transformation goals, poor steering effect, damage to reservoirs, etc., to achieve no need for cross-linking agents and Gel breaker, good retarding and filtration control, complete flowback effect

Active Publication Date: 2013-07-31
PETROCHINA CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polymer cross-linking, foam and other diverting acidification systems developed earlier have limitations such as damage to the reservoir, poor diverting effect, complicated process, etc., and it is difficult to achieve the expected transformation goals

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
  • Visco-elastic surfactant acidizing liquid
  • Visco-elastic surfactant acidizing liquid
  • Visco-elastic surfactant acidizing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Design parameters

[0023] (1) According to the requirements of the geological plan, according to the physical characteristics of the well and the practice of acidizing measures in the oilfield, in order to meet the requirements of the measures, the plugging removal radius is designed to be 3m.

[0024] (2) The designed volume of treatment liquid entering the formation is 17m 3 (V=πR 2 hφ, h=6m, φ=10.8%, R=3m).

[0025] (3) The acidizing construction process is mainly divided into four slugs

[0026] 2. Formula and quantity of working fluid

[0027]

[0028] 3. Construction steps and requirements

[0029] (1) Pull out the production tubing string from the original well for careful inspection, stab and clean it, and replace unqualified tubing and rods. It is strictly forbidden to enter the well with waxy or scaled tubing.

[0030] (2) Drill the well to the bottom of the artificial well through the lower φ118mm well gauge. If there is obstruction in the middle,...

Embodiment 2

[0038] 1. Design parameters

[0039] (1) According to the requirements of the geological plan, according to the physical properties of the well and the practice of acidizing measures in the oil field, in order to meet the requirements of the measures, the plugging removal radius is designed to be 1.5m.

[0040] (2) The designed volume of treatment liquid entering the formation is 14m 3 (V=πR 2 hφ, h=19.9m, φ=10.8%, R=1.5m).

[0041] (3) The acidizing construction process is mainly divided into four slugs

[0042] 2. Formula and quantity of working fluid

[0043]

[0044] 3. Construction steps and requirements

[0045] (1) Pull out the production tubing string from the original well for careful inspection, stab and clean it, replace unqualified tubing and rods, and strictly prohibit tubing with wax and dirt from entering the well.

[0046] (2) Drill the well to the bottom of the artificial well through the lower φ118mm well gauge. If there is obstruction in the middle, ...

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 visco-elastic surfactant acidizing liquid. The visco-elastic surfactant acidizing liquid is diverting acidization liquid for anisotropic sandstone oil reservoirs. The visco-elastic surfactant acidizing liquid comprises: by weight, 10% of HCl, 8% of HF, 5% of dodecyl dimethyl betaine, 0.5% of glycol and the balance water. The visco-elastic surfactant acidizing liquid has the advantages of pH control self-diverting function, good diverting effects, no need of a cross-linking agent and a gel breaking agent, good speed slowing effects and good filtration control effects. The visco-elastic surfactant acidizing liquid has thorough flowback effects and does not produce damage and pollution on a reservoir. Through optimization of construction process parameters, when a method adopting the visco-elastic surfactant acidizing liquid is utilized in twelve oil wells of a Jiyuan oil field, a method success rate reaches 90%.

Description

technical field [0001] The invention relates to a diverting acidizing fluid applied to heterogeneous sandstone reservoirs. Background technique [0002] Heterogeneous, low-permeability reservoirs occupy a large proportion in oilfields. When conventional acidification technology is used to transform such reservoirs, the acid liquid will finger along the large channels or high-permeability parts of the heterogeneous reservoirs, and it is difficult to effectively transform the low-permeability parts of the heterogeneous reservoirs, which will affect the overall acidification. The effect of the job. For this type of reservoir, it is necessary to adopt the diverting acidizing technology to achieve the purpose of uniform stimulation. The polymer cross-linking, foam and other diverting acidification systems developed earlier have limitations such as damage to the reservoir, poor diverting effect, complex process, etc., and it is difficult to achieve the expected transformation go...

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): C09K8/74
Inventor 杨立华郑力军马丽萍徐永高慕立俊黎晓茸李永长张涛
Owner PETROCHINA CO LTD
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