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

A kind of gelling agent for gelling acid system and its preparation and application

A technology of gelling agent and gelling acid, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problem of unstable gelling agent, limited temperature resistance of gelling acid system, and inability to use high-temperature deep well reservoirs and other problems, to achieve the effect of good temperature resistance, simple preparation process and good practicability

Active Publication Date: 2018-10-19
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Existing gelling agents are unstable (degraded) under high temperature conditions, resulting in limited temperature resistance of the gelling acid system and cannot be used in high-temperature deep well reservoirs

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 gelling agent for gelling acid system and its preparation and application
  • A kind of gelling agent for gelling acid system and its preparation and application
  • A kind of gelling agent for gelling acid system and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0039] Examples 1-4: Preparation of gelling agent.

[0040] (1) Prepare 20% sodium hydroxide solution, and use the solution to neutralize the 2-acrylamido-2-methylpropanesulfonic acid in the three-necked flask.

[0041] (2) After the neutralization reaction is completed, lower the temperature in the three-neck flask to 10°C, add acryloyloxyethyltrimethylammonium chloride, acrylamide, etc., and water in sequence, and stir evenly.

[0042] (3) Nitrogen gas was passed into the neutralization three-necked bottle to drive away oxygen for 40 minutes to obtain a comonomer mixture.

[0043] (4) Put the comonomer mixture into the polymerization chamber in batches, add the set initiator, seal the reaction for 5 hours, and synthesize the jelly-state gelling agent.

[0044] (5) Take out the jelly-state gelling agent, cut and granulate, dry, pulverize, and sieve to obtain the finished product of dried gelling agent granules.

[0045]Examples 1-4 The composition of the comonomer mixture, ...

Embodiment 5-10

[0049] Examples 5-10: Preparation of gelled acid systems for oil and gas wells.

[0050] Use the gelling agents prepared in Examples 1-4 above to prepare cross-condensing acid systems for oil and gas wells. The preparation method is: add part of the analytically pure hydrochloric acid to an appropriate amount of water and stir evenly to form a 15-25% solution Stir at 15-30°C, add the gelling agent evenly into the prepared hydrochloric acid solution, stop stirring for 0.5-1h, seal the container, let it stand for 3-5h to fully swell and mature evenly; continue stirring for 0.5 After ~1 hour, add multifunctional additives (corrosion inhibitor, iron ion stabilizer, demulsifier and drainage aid) according to the proportion, and after stirring evenly, the temperature-resistant gelling acid system for acidification and acid fracturing of oil and gas wells (that is, oil and gas wells) can be obtained. with gelled acid systems).

[0051] Determination of the rheology and corrosion inh...

Embodiment 11

[0059] Example 11: Core flooding experiment under simulated formation conditions (95°C).

[0060] The gelled acid system prepared in Example 5 was subjected to a core displacement experiment under simulated formation conditions (95° C.) using a short core acidizing flow tester.

[0061] Experimental method: Through the core displacement experiment, record the pressure, flow rate at both ends of the core and the basic parameters of the core and fluid during the experiment, and calculate the change process and change of the core permeability before, during and after acidification according to Darcy's formula To analyze the improvement of the core permeability by the gelled acid system; at the same time, by injecting liquid paraffin into the acidified core, after the core cools, the paraffin solidifies in the pore channels of the core, leaving a model of the acid-rock reaction. Reflect the etched form and characteristics of acid and rock.

[0062] The Darcy formula for calculati...

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
molecular weightaaaaaaaaaa
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a gelling agent for gelled acid system and preparation and application thereof. The gelling agent is a copolymer of three monomers, i.e., acryloyloxyethyl trimethyl ammonium chloride, acrylamide and 2-acrylamide-2-methyl propyl sulfonate, and has a molecular weight of 8000000-15000000 Dalton, and as to ratios of the three monomers, a molar ratio of the acrylamide to the 2-acrylamide-2-methyl propyl sulfonate is (0.20-96.75):1, and a molar ratio of the acryloyloxyethyl trimethyl ammonium chloride to the 2-acrylamide-2-methyl propyl sulfonate is (7.40-201.21):1. The gelling agent prepared herein and the gelled acid system have good temperature tolerance, good retardancy and good corrosion inhibition and are applicable to reforming of deep-well high-temperature reservoirs.

Description

technical field [0001] The invention belongs to the technical field of oil field reservoir reconstruction, and in particular relates to a gelling agent used in a gelling acid system and its preparation and application. Background technique [0002] Carbonate reservoirs occupy a very important position in the world's oil and gas fields. According to the statistics of 14 super giant oil fields in the world's oceans, 83% of the reservoirs come from carbonate rock deposits. Carbonate oil and gas fields have been found in 57 sedimentary basins in nearly 40 countries and regions in the world, and their oil and gas reserves account for 48% and 28% of the world's total oil and gas reserves, respectively. Accounting for about 60% and 30% of the world's total oil and gas production, a large number of carbonate oil and gas reservoirs have been proved in many oil and gas fields in China. [0003] Fracturing and acidizing is a commonly used stimulation technology for carbonate reservoi...

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): C08F220/34C08F220/56C08F220/58C09K8/74
Inventor 吴川张祖国蒋建方苏建政张汝生龙秋莲
Owner CHINA PETROLEUM & CHEM CORP
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