Composite oil flooding experimental method of alternately injecting gel and polymer solution after water flooding and polymer flooding

A polymer solution and composite flooding technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problem of low oilfield oil recovery, etc. The effect of oil efficiency

Inactive Publication Date: 2015-05-20
NORTHEAST GASOLINEEUM UNIV
View PDF4 Cites 21 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a composite flooding experimental method of alternately injecting

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
  • Composite oil flooding experimental method of alternately injecting gel and polymer solution after water flooding and polymer flooding
  • Composite oil flooding experimental method of alternately injecting gel and polymer solution after water flooding and polymer flooding
  • Composite oil flooding experimental method of alternately injecting gel and polymer solution after water flooding and polymer flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Using the first large slab core, multiple rounds of alternating injection flooding experiments with small slugs of gel and larger slugs of polymer solution were carried out after water flooding and polymer flooding. The original oil saturation of the first large slab core is 53.14%. According to the experimental procedure, firstly, the water content of the core outlet is water-flooded to 98%, and the water-flooding recovery rate is 40.16%. The yield was 17.02%; then, alternate injection of 0.02PV gel + 0.03PV polymer solution was used for oil displacement, a total of 13 rounds of injection of gel + polymer solution, 0.65PV, followed by water injection until the water cut reached 90% . The recovery of gel + polymer solution alternate injection flooding (including subsequent water flooding) increases by 8.78% on the basis of polymer flooding.

[0033] Such as figure 1 as shown, figure 1 It is the curve diagram of the experimental results of gel+polymer flooding altern...

Embodiment 2

[0035]The second largest slab core was used to conduct polymer flooding after water flooding until the water cut reached 98%, and then multiple rounds of alternating injection of small slugs of gel and larger slugs of polymer solution were used for flooding experiments. The second largest slab core had an original oil saturation of 53.96%. According to the experimental procedure, firstly, the water content at the outlet of the water flooding core reaches 98%, and the water flooding recovery rate is 40.08%; then polymer flooding, when the polymer flooding reaches 0.64PV, the recovery rate at this stage is 17.48%, and the polymer flooding continues until the water cut It reached 98% (0.99PV), and the recovery increased by 2.88% at this time, and the ultimate recovery of polymer flooding increased by 20.36% on the basis of the recovery of water flooding. Next, 0.02PV gel + 0.03PV polymer solution was alternately injected to drive oil. A total of 13 rounds of gel + polymer solutio...

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
Permeabilityaaaaaaaaaa
Pore volumeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a composite oil flooding experimental method of alternately injecting gel and a polymer solution after water flooding and polymer flooding. The method specifically includes the following steps of firstly, manufacturing large flat plate cores, and marking the large flat plate cores as the first large flat plate core and the second large flat plate core; secondly, conducting water flooding, and calculating the water flooding recovery ratio; thirdly, conducting polymer flooding, and calculating the polymer flooding limited recovery ratio; fourthly, alternately injecting the gel and the polymer solution to conduct oil flooding; fifthly, conducting subsequent water flooding, and calculating the final recovery ratio. The method has the technical advantages that the gel has the gradually-gluing characteristic, temporary blocking is conducted on a high-permeability layer, and the swept volume is expanded through fluid which subsequently flows in; the instant negative pressure can be formed through the viscosity of the gel, and therefore the recovery ratio is greatly increased on the basis of polymer flooding; due to the fact that the price of the polymer is relatively low, the gel and polymer alternate injection technology is simple, and the method has the great application prospects on site.

Description

technical field [0001] The invention relates to the technical field of chemical flooding, in particular to a compound flooding experimental method of alternately injecting gel and polymer solutions after water flooding and polymer flooding. Background technique [0002] In recent years, polymer flooding has become an important technical means to increase reserves and production in oilfields. There are two reasons for polymer flooding to greatly increase the oil recovery in waterflooded oilfields. One is the high viscosity of polymer solutions. , can effectively improve the water-oil mobility ratio, which is conducive to alleviating the contradiction between layers, improving the liquid absorption profile, expanding the swept volume of the displacement liquid, and thereby improving oil recovery; second, because the polymer solution has a viscoelastic effect, it can effectively It can effectively displace all kinds of water flooding residual oil, improve oil displacement effic...

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): E21B43/20E21B43/22
CPCE21B43/16E21B43/20
Inventor 张继红王亚楠卓兴家朱正俊郭鑫赵昕锐李忠灵
Owner NORTHEAST GASOLINEEUM UNIV
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