Experimental method for determining water-oil displacement efficiency of fresh loose sandstone sample

An experimental method and water flooding technology, applied in the field of unconsolidated sandstone reservoir development experiments, can solve problems such as poor cementation, particle loss, and the accuracy of results affecting oil displacement efficiency, so as to achieve accurate experimental data, quantitative identification, and error avoidance Effect

Active Publication Date: 2021-08-27
CNOOC ENERGY TECH & SERVICES
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the poor cementation of unconsolidated sandstone reservoir rocks, particle loss is prone to occur in the process of core displacement and extraction. There is a large difference in the pore volume of the pre-displacement cores, which affects the accuracy of the results of oil displacement efficiency under different displacement multiples

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
  • Experimental method for determining water-oil displacement efficiency of fresh loose sandstone sample
  • Experimental method for determining water-oil displacement efficiency of fresh loose sandstone sample
  • Experimental method for determining water-oil displacement efficiency of fresh loose sandstone sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] An experimental method for measuring the water flooding efficiency of a fresh unconsolidated sandstone sample, comprising the following steps:

[0056] Step 1: Use deuterium water with a purity of 99.9% as a solvent to prepare a deuterium-containing saline solution with the same salinity as the target oilfield formation water (salinity is 7969mg / L), and a Mn-containing solution with a manganese ion concentration of 11000mg / L. 2+ Deuterium aqueous solution, preparation viscosity is the simulated oil of 3.5mPa s, and draw the standard curve of nuclear magnetic signal quantity and simulated formation water volume, the standard curve of nuclear magnetic signal quantity and simulated oil volume respectively as above; Wherein, described saline deuterium aqueous solution is A mixed solution of sodium chloride, magnesium chloride, and calcium chloride, the mass ratio of which is: NaCl:CaCl 2 :MgCl 2 ·6H 2 O=7:0.6:0.4;

[0057] Step 2: After freezing the fresh loose sandstone...

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
diameteraaaaaaaaaa
lengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses an experimental method for determining the water-oil displacement efficiency of a fresh loose sandstone sample, which comprises the following steps: on the basis of a nuclear magnetic resonance technology and a traditional displacement experimental technology, establishing standard curves of nuclear magnetic semaphores of target stratum simulated oil and simulated stratum water about respective contents, and finally obtaining the oil displacement efficiency under different displacement multiples and different water saturation. According to the method, the fluid in the fresh loose sandstone sample is rapidly, nondestructively and quantitatively identified, the problem of long oil displacement efficiency acquisition period in the water displacement process of the fresh loose sandstone sample is solved, errors caused by core particle falling to pore volume measurement are avoided, and experimental data are more accurate.

Description

technical field [0001] The invention belongs to the technical field of unconsolidated sandstone reservoir development experiments, and in particular relates to an experimental method for measuring the water displacement efficiency of fresh unconsolidated sandstone samples. Background technique [0002] At present, a large number of main oilfields in China have entered the medium and high water cut period. In order to realize the long-term stable production of medium and high water cut oilfields, it is imperative to make a reasonable evaluation of the water flooding development effect, and according to the evaluation results, aim at the development process. The problem is to formulate a sound development technology policy. Since the fresh samples better preserve the wettability characteristics of the formation conditions and are more representative of the reservoir, the water flooding efficiency evaluation experiment based on fresh cores is an important parameter for evaluati...

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): E21B43/20E21B47/00G01N1/28G09B25/04
CPCE21B43/20E21B47/00G01N1/28G09B25/04Y02A90/30
Inventor 何伟陈科康楠张旭东刘志伟王勇张铜耀唐磊董雯婷洪鑫陈毅雯
Owner CNOOC ENERGY TECH & SERVICES
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