Large-pore composite plugging system and preparation method thereof

A technology of large channels and systems, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of short thermal stability time, failure to achieve plugging effect, short plugging validity period, etc., and achieve dispersion stability good effect

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that when the jelly-type plugging agent in the prior art is used under high temperature conditions, there are problems such as short thermal

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] Example 1

[0029] The large-pore composite plugging system described in this example includes 1 kg of amphoteric polyacrylamide solution with a concentration of 0.2 wt%, 1 kg of cationic polyacrylamide solution with a concentration of 0.2 wt%, and 0.03 kg of a particle size of 100 mesh Active Calcium Carbonate.

[0030] The preparation method of the large-pore composite plugging system described in this embodiment comprises the following steps:

[0031] (1) Slowly add a specific amount of amphoteric polyacrylamide into a specific amount of oil field injection water with a salinity of 3000mg / L, stir at a stirring speed of 680r / min for 30min, then reduce the stirring speed to 420r / min, and continue stirring After 2 hours, a homogeneously mixed amphoteric polyacrylamide solution was obtained.

[0032] (2) Add a specific amount of activated calcium carbonate with a specific particle size to the amphoteric polyacrylamide solution in the step (1), stir for 15 min at a stir...

Example Embodiment

[0035] Example 2

[0036] The large pore composite plugging system described in this example includes 1.5kg of amphoteric polyacrylamide solution with a concentration of 0.3wt%, 1kg of dodecyltrimethylammonium chloride solution with a concentration of 1wt%, and 0.075kg The particle size is 120 mesh active calcium carbonate.

[0037] The preparation method of the large-pore composite plugging system described in this embodiment comprises the following steps:

[0038] (1) Slowly add a specific amount of amphoteric polyacrylamide into a specific amount of oil field injection water with a salinity of 5000mg / L, stir at a stirring speed of 680r / min for 30min, then reduce the stirring speed to 420r / min, and continue stirring After 2 hours, a homogeneously mixed amphoteric polyacrylamide solution was obtained.

[0039] (2) Add a specific amount of activated calcium carbonate with a specific particle size to the amphoteric polyacrylamide solution in the step (1), stir for 15 min at a...

Example Embodiment

[0042] Example 3

[0043] The macropore composite plugging system described in this example includes 2 kg of amphoteric polyacrylamide solution with a concentration of 0.35 wt%, 1 kg of dodecyldimethylbenzyl ammonium chloride solution with a concentration of 2.5 wt%, and The particle size of 0.12kg is 150 mesh fly ash.

[0044] The preparation method of the large-pore composite plugging system described in this embodiment comprises the following steps:

[0045] (1) Slowly add a specific amount of amphoteric polyacrylamide into a specific amount of oil field injection water with a salinity of 10,000mg / L, stir at a stirring speed of 700r / min for 30min, then reduce the stirring speed to 400r / min, and continue stirring Obtained after 1.8h, mixed homogeneous amphoteric polyacrylamide solution;

[0046] (2) Add a specific amount of fly ash with a specific particle size to the amphoteric polyacrylamide solution in the step (1), stir for 15 min at a stirring speed of 700 r / min, and ...

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 sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention provides a large-pore composite plugging system and a preparation method thereof, belonging to the technical field of oil exploitation. The large-pore composite plugging system comprises amphoteric polyacrylamide solution with concentration of 0.2-0.5wt%, a flocculation agent solution and inorganic granules, wherein the flocculation agent solution is a cationic polymer solution with concentration of 0.2-0.5wt% or cationic surface active agent with concentration of 1-4wt%. The large-pore composite plugging system has the advantages of high elasticity, high plugging capability, movability and good thermal stability.

Description

technical field [0001] The invention relates to a large-pore composite plugging system, which belongs to the technical field of petroleum exploitation. Background technique [0002] In the process of oilfield exploitation, water flooding development is the main oil recovery method, but in the process of long-term water flooding development, due to water flushing and clay loss, the heterogeneity of the formation is deteriorated, and the permeability of the formation with higher permeability is further improved , the injected water often flows along the high-permeability layer, and the erosion of the high-permeability layer by water further leads to a great increase in the permeability of the high-permeability layer, and some high-permeability layers even form large channels for channeling. The water content of the produced fluid in the reservoir has reached 90%, or even more than 95%, and the cost of oil production has risen sharply. [0003] In order to make the injected wa...

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): C09K8/508
CPCC09K8/5045C09K8/5083C09K8/512
Inventor 汪庐山田玉芹刘承杰郭宏伟杨圣贤尚朝辉高生伟陈雷张冬会唐延彦靳彦欣杜立滨赵玲张光焰
Owner CHINA PETROLEUM & CHEM CORP
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