Gelled acid used for acid fracturing of high-temperature fractured-vuggy type carbonate reservoir

A carbonate reservoir, fracture-cavity type technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problem of incomplete and perfect formula, weak acid viscosification ability, long time for on-site preparation, etc. problems, to achieve the effects of good compatibility and fluid loss control performance, short acid dissolution time, and reduced reservoir damage

Inactive Publication Date: 2014-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
View PDF5 Cites 26 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] At present, domestic thickener products used in acid fracturing of high-temperature carbonate rock reservoirs above 120 °C mostly show shortcomings such as being greatly affected by shearing, weak acid viscosity-increasing ability, and long preparation time on site. It can overcome

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
  • Gelled acid used for acid fracturing of high-temperature fractured-vuggy type carbonate reservoir
  • Gelled acid used for acid fracturing of high-temperature fractured-vuggy type carbonate reservoir
  • Gelled acid used for acid fracturing of high-temperature fractured-vuggy type carbonate reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0033] A thickening acid for acid fracturing of high-temperature fracture-cavity carbonate rock reservoirs, characterized in that the thickening acid comprises, by weight percentage: hydrochloric acid, 20%; thickening agent, 3%; corrosion inhibitor agent, 2%; iron ion stabilizer, 1.5%; demulsifier, 0.05%; drainage aid, 1.5%; the balance is water.

[0034] The preparation process is as follows: first dilute industrial hydrochloric acid to a concentration of 20%, then add 1.5% iron ion stabilizer FL4-7, 0.05% demulsifier PRJ, 1.5% Drainage aid AD12, then add 3% thickener TP-1, at room temperature, mix evenly and swell for about 2 hours, the thickener can be fully dissolved and thickened in the formula acid solution, finally add 2% Corrosion inhibitor MC50, made into thickened acid after fully stirring.

[0035] The selection of thickener is an important point in the preparation of thickened acid. figure 1 It shows the viscosity measurement curve of thickened acid (20% HCl) pre...

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 gelled acid used for acid fracturing of a high-temperature fractured-vuggy type carbonate reservoir. The gelled acid comprises components in percentage by weight as follows: 20% of hydrochloric acid (HCl), 3% of a gelling agent (TP-1), 2% of a corrosion inhibitor (MC50), 1.5% of a ferric ion stabilizer (FL4-7), 0.05% of a demulsifying agent (PRJ), 1.5% of a discharge aiding agent (AD12) and the balance of water. The gelled acid can resist a temperature of 130 DEG C, and has an excellent rheological property and shearing resistance, good compatibility and filtration reduction performance and low frictional resistance; compared with common acid (20% of HCl), the acid-rock reaction speed can be reduced by 52%; under the condition of high temperature, the processing depth of the gelled acid to the stratum is enlarged, acidulating efficiency and success rate are increased, and pipe column corrosion and formation damage can be effectively reduced simultaneously, the gelled acid is prone to flowback and has a capacity of carrying solid-phase particles, the acid dissolution time of the gelling agent is short, so that field preparation is facilitated, and the gelled acid is very suitable for acid fracturing improvement of the high-temperature fractured-vuggy type carbonate reservoir.

Description

technical field [0001] The invention relates to the acid fracturing stimulation technology for carbonate rock reservoirs, in particular to the thickening acid technology for acid fracturing of high-temperature fracture-cavity carbonate rock reservoirs. Background technique [0002] Acid fracturing is the most effective stimulation measure for the development of carbonate reservoirs, and its success depends on the effective length of acid-etched fractures and the conductivity of acid-etched fractures after acid fracturing. For high-temperature deep wells, in addition to being controlled by rock properties and in-situ stress fields, the effective acid-etched fracture length is mainly controlled by the acid-rock reaction rate and the fluid loss characteristics of acid fluid. The conductivity of acid-etched fractures depends on the closure stress of the formation, the compressive strength of the rock, the amount of acid-dissolved rock, and the irregularity of the acid-etched sha...

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
CPCC09K8/602C09K8/725C09K8/74C09K8/882C09K2208/32
Inventor 郭天魁曲占庆龚迪光田雨杨阳王冰李小龙黄德胜
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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