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

Lactic-acid-like acidifying blockage remover for removing blockage of heavy oil well and application of same

A plug-relieving agent and technology for oil wells, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as low plugging effect, avoid the formation of acid residue, prolong the action time, reduce construction costs and environmental pollution Effect

Active Publication Date: 2021-04-30
PETROCHINA CO LTD
View PDF7 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is suitable for the plugging of general oil wells with inorganic and organic fouling, and has little effect on the plugging caused by factors such as asphaltene and colloid in heavy oil wells

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
  • Lactic-acid-like acidifying blockage remover for removing blockage of heavy oil well and application of same
  • Lactic-acid-like acidifying blockage remover for removing blockage of heavy oil well and application of same
  • Lactic-acid-like acidifying blockage remover for removing blockage of heavy oil well and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The performance test of the plug removing agent in Example 1 and Example 2 used heavy oil from Well Wa 38-26-48 in Xiaowa Block of Liaohe Oilfield (colloid + asphaltenes accounted for 34.87% of the total weight of crude oil). The viscosity of heavy oil at different temperatures was measured with a Brookfield rotational viscometer. The measured viscosity-temperature curves are shown in figure 1 .

[0027] In Example 1 and Example 2, the viscosity reduction rate of the blocking agent to the heavy oil was tested according to the standard of Q / SY 118-2013 "Technical Specification for Oil-in-Water Viscosity Reducing Agents for Heavy Oils", and the specific test method was: Mix the heavy oil and the plugging remover in a mass ratio of 7:3, stir at a constant temperature of 50 °C until the heavy oil is evenly dispersed in the plugging remover, and then measure the viscosity of the heavy oil at this time with a Brookfield viscometer. Viscosity reduction rate=(viscosity of heav...

Embodiment 2

[0037] The present embodiment provides a kind of lactic acid-like blocking removing agent for heavy oil well blocking removal, which is prepared by the following specific steps:

[0038] 1. Add 781.9g of water, 80g of hydrochloric acid (concentration of 30% industrial hydrochloric acid), 50g of polyacrylic acid, 70g of ammonium fluoride, 2g of aminotriacetic acid, 3g of benzyl chloride quaternized imidazoline quaternary ammonium into the corrosion-resistant container in turn Salt, 4g chlorine-free clay stabilizer HJZ-300, 6g thiourea dioxide, 0.2g block copolymerized alkyl glucoside with polyoxyethylene and polyoxypropylene chains, stir well at room temperature;

[0039] 2. Continue to add 2 g of sorbitan tristearate, 0.4 g of sorbitan oleic acid monoester polyoxyethylene ether, and 0.5 g of butyl glycol ether to obtain a blocking remover.

[0040] The performance test of the plug remover obtained in this example shows that the viscosity reduction rate of the plug remover to h...

Embodiment 3

[0042] The present embodiment provides a practical application of a lactic acid-like deblocking agent for heavy oil well deblocking. In weight percent, the specific composition of the deblocking agent used is:

[0043] 0.6% sorbitan tristearate, 0.06% sorbitan oleate monoester polyoxyethylene ether, 0.1% ethylene glycol tert-butyl ether, 8% hydrochloric acid (30% concentration of industrial hydrochloric acid), 8 % polyorganic carboxylic acid (polyacrylic acid and citric acid with a mass ratio of 3:2), 10% fluoride salt (ammonium fluoride and ammonium bifluoride with a mass ratio of 1:2), 0.3% benzyl chloride quaternized imidazoline Quaternary ammonium salt, 0.04% block copolymerized alkyl glycosides with polyoxyethylene and polyoxypropylene chains, 0.6% chlorine-free clay stabilizer HJZ-300, 0.4% aminotriacetic acid, 0.8% thiourea dioxide, the balance is water.

[0044] After the above components are uniformly mixed, the blocking agent is obtained. The plug-removing effect o...

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
Surface tensionaaaaaaaaaa
Surface tensionaaaaaaaaaa
Viscosityaaaaaaaaaa
Login to View More

Abstract

The invention provides a lactic-acid-like acidifying blockage remover for blockage removal of a heavy oil well and application of the same. The blocking remover is prepared from the following components in percentage by weight: sorbitan tristearate, sorbitan monooleate polyoxyethylene ether, ethylene glycol tert-butyl ether, hydrochloric acid, polybasic organic carboxylic acid, villiaumite, an imidazoline corrosion inhibitor, a cleanup additive, a clay stabilizer, an iron ion stabilizer, an acid slag inhibitor and water. The invention further provides application of the blocking remover in deep blocking removal construction of a heavy oil well. The blockage remover provided by the invention can realize effective deep blocking removal of a stratum, relieves operation pollution and organic and inorganic blocking of a heavy oil well, has a remarkable effect, and quickly recovers the productivity of the heavy oil well.

Description

technical field [0001] The invention relates to an acidification plugging removal technology for formation blockage of heavy oil wells by steam flooding or steam huff and puff, in particular to a lactic acid-like plugging removal agent used for heavy oil well plugging removal and its application. Background technique [0002] In the production process of heavy oil wells, there are three key factors that affect the normal production of heavy oil wells: 1. With the prolongation of steam huff and puff rounds or steam flooding time, the light components in heavy oil are preferentially produced, resulting in a large amount of Colloids and asphaltenes accumulate and precipitate in the formation, causing the formation permeability to decrease. Second, after steam is injected into the formation, the steam liquid phase contacts the surface of the rock particles. Due to the loose cementation, high porosity and permeability, and large specific surface area of ​​the heavy oil reservoir, ...

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): C09K8/524C09K8/52
CPCC09K8/524C09K8/52
Inventor 齐鹏安志杰陈志会汪小平田鑫杨开张新委张崇刚李德胜邹运张学钦杜健王佳昊丁一铭张骥潇刘可心邢盼盼毕雯雯
Owner PETROCHINA CO LTD
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