Expandable graphite plugging agent system for deep channel blocking of heavy oil reservoir steam flooding and injection method

A technology for expanded graphite and heavy oil reservoirs, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve the problems of short validity period, short consolidation time, complicated high-temperature foam construction, etc., to save economic costs, The effect of improving mining efficiency and facilitating deep migration

Active Publication Date: 2017-05-10
CHINA UNIV OF PETROLEUM (EAST CHINA) +3
View PDF5 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the short effective period of high-temperature foam, fast jelly formation, and poor migration of inorganic particles in conventional steam channeling measures, the deep channeling technology of steam flooding in heavy oil reservoirs is facing great challenges
High-temperature foam sealing agents mainly include temperature-resistant foaming agents such as alkylbenzene sulfonate and α-olefin sulfonate, which can improve steam (water) flooding sweep coefficient and oil displacement efficiency, but high-temperature foam construction is relatively complicated. Poor controllability in formation, short validity period
In addition, for long-term steam-flooded high-temperature formations, the stability of the foam drops sharply, reducing the channel sealing effect
High-temperature jelly-type channeling agents are mainly composed of heat-resistant polymers, tannin extracts (modified tannin extracts), lignin and other systems and aldehyde cross-linking agents, which can withstand temperatures of 200°C, but due to excessive concentration, the cost In addition, due to the high formation temperature (≥150°C), the gelation time of the jelly-type blocking agent system is generally less than 10 hours, resulting in poor deep migration ability of the jelly-type plugging agent system, and it is impossible to realize deep steam sealing. Channeling; granular plugging agents mainly include inorganic rigid particles such as ultra-fine cement and clay. Such plugging agents have poor mobility and are often deposited near the wellbore. It is difficult to achieve deep sealing of steam and is sensitive to temperature. The consolidation time of the plugging agent system is short, and there are certain engineering risks in the construction process

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
  • Expandable graphite plugging agent system for deep channel blocking of heavy oil reservoir steam flooding and injection method
  • Expandable graphite plugging agent system for deep channel blocking of heavy oil reservoir steam flooding and injection method
  • Expandable graphite plugging agent system for deep channel blocking of heavy oil reservoir steam flooding and injection method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0038] The preparation method of the above-mentioned expandable graphite plugging agent system for steam flooding deep channeling of heavy oil reservoirs, the steps are as follows:

[0039] At room temperature (20±5°C), first add non-ionic polymer to the liquid preparation water to prepare the carrier liquid, stir for 60 minutes until it is fully dissolved; then add low-temperature expandable graphite particles, stir for 10 minutes until it is fully dispersed to prepare Obtain a low-temperature expansion particle plugging agent system for steam flooding deep channeling in heavy oil reservoirs; at room temperature (20±5°C), add non-ionic polymers to the liquid preparation water to prepare the carrier fluid, stir for 60 minutes until it is fully dissolved Then add medium-temperature expandable graphite particles, stir for 10 minutes and wait for it to fully disperse to obtain a medium-temperature expandable particle plugging agent system for steam flooding deep channeling in heav...

Embodiment 1

[0054] This example provides the preparation method and injection method of the expandable graphite plugging agent system for steam flooding deep channeling in heavy oil reservoirs.

[0055] Expandable graphite plugging agent system for steam flooding deep channeling in heavy oil reservoirs, including: carrier fluid, low temperature expandable graphite particles (initial expansion temperature 150°C), medium temperature expandable graphite particles (initial expansion temperature 220°C), high temperature expandable graphite particles Expanded graphite particles (initial expansion temperature 300°C), mixed with water.

[0056] At room temperature (20±5°C), add 0.1 g of non-ionic polymer to 99.4 g of clear water while stirring and stir for 60 minutes. After it is fully dissolved, the carrier liquid is prepared, and then 0.5 g of low-temperature expandable graphite particles are added. Stir for 10 minutes and wait for it to fully disperse to obtain a low-temperature expandable gra...

Embodiment 2

[0065] This example provides the preparation method and injection method of the expandable graphite plugging agent system for steam flooding deep channeling in heavy oil reservoirs.

[0066] Expandable graphite plugging agent system for steam flooding deep channeling in heavy oil reservoirs, including: carrier fluid, low temperature expandable graphite particles (initial expansion temperature 150°C), medium temperature expandable graphite particles (initial expansion temperature 220°C), high temperature expandable graphite particles Expanded graphite particles (initial expansion temperature 300°C), mixed with water.

[0067] At room temperature (20±5°C), add 0.15 g of polymer in turn to 98.85 g of clear water while stirring and stir for 60 minutes. After it is fully dissolved, a carrier liquid is obtained, then add 1.0 g of low-temperature expandable graphite particles, and stir After 10 minutes of being fully dispersed, a low-temperature expandable graphite plugging agent sys...

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
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to view more

Abstract

The invention relates to an expandable graphite plugging agent system for deep channel blocking of heavy oil reservoir steam flooding. The system comprises, by mass fraction of the total mass of the plugging agent system, 0.5%-1.0% of low-temperature expandable graphite particles, 0.4%-0.8% of medium-temperature expandable graphite particles, 0.3%-0.6% of high-temperature expandable graphite particles, 0.1%-0.2% of carrying fluid, and the balance fluid preparation water; and the carrying fluid is a non-ion polymer water solution, and the mass fraction sum of all the components is 100%. According to the expandable graphite plugging agent system for deep channel blocking of the heavy oil reservoir steam flooding, the temperature-resisting non-ion polymer water solution serves as the carrying fluid, the graphite particles with different initial expansion temperatures are carried into a deep stratum, and according to the distributing characteristics of the temperature gradient field of a steam flooding steam channel, the graphite particles with the different initial expansion temperatures slowly expand, so that deep channel blocking for the steam flooding steam channel is achieved, and further the swept volume of the steam flooding is enlarged.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and in particular relates to an expandable graphite plugging agent system and an injection method thereof for deep steam channeling of heavy oil reservoirs. [0002] technical background [0003] my country is rich in heavy oil resources, accounting for about 30% of the total oil reserves, and steam injection is the main way of heavy oil reservoir exploitation. For unconsolidated sandstone heavy oil reservoirs or heavy oil reservoirs with fractures, after long-term steam flooding, the formation forms a dominant seepage channel, which makes the injected steam escape along the high-permeability layer, and the swept volume of steam decreases, resulting in oil wells containing As water volume rises, yields fall. Prevention and control of steam channeling by steam flooding is an important way to improve the sweep efficiency of steam flooding in heavy oil reservoirs and a problem to be solved urgentl...

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 Applications(China)
IPC IPC(8): E21B43/22E21B43/24C09K8/46
CPCE21B43/16E21B43/24C09K8/46
Inventor 戴彩丽赵光刘合张洪君由庆陶嘉平赵明伟郑孟
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