Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Method for optimizing water driving speed in dynamic water driving process of tight oil reservoir

A technology for tight oil reservoirs and water flooding, which is used in water resource assessment, material analysis through resonance, and nuclear magnetic resonance analysis, etc. It can solve problems such as unreported and achieve the effect of avoiding errors.

Inactive Publication Date: 2019-04-12
XI'AN PETROLEUM UNIVERSITY
View PDF16 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main problems mentioned above: the existing research on water flooding in tight reservoirs is mainly reflected in the methods and devices of displacement experiments, the analysis of microscopic water flooding characteristics of reservoirs, the analysis of factors affecting water flooding and the effect of water flooding on the improvement of water flooding. However, there is no report on the method of determining the optimal displacement rate in the dynamic water flooding process of tight oil reservoirs.

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
  • Method for optimizing water driving speed in dynamic water driving process of tight oil reservoir
  • Method for optimizing water driving speed in dynamic water driving process of tight oil reservoir
  • Method for optimizing water driving speed in dynamic water driving process of tight oil reservoir

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present invention is based on nuclear magnetic resonance technology to the optimization method of water flooding oil displacement speed, see figure 1 shown, including the following steps:

[0042] Step 1. Drill a core with a diameter of 2.5cm and a length of 5cm from the full-diameter core, wash and dry the oil, and the gas permeability is 6.004md;

[0043] Step 2, preparing simulated formation water to achieve the salinity of the formation water;

[0044] Step 3. Configure simulated oil with a viscosity of 3.98mPa.s, reaching the viscosity of crude oil in the oil field;

[0045] Step 4: The core is vacuumed and saturated with simulated formation water for 24 hours, the measured porosity is 18.24%, and the calculated pore volume is 4.48cm 3 ;The calculation formula of pore volume is:

[0046] V=πr 2 L×Φ (2)

[0047] Where: r is the radius of the core in cm, L is the length of the core in cm, and Φ is the core porosity%;

[0048] Step five, use Mn-containing 2+ ...

Embodiment 2

[0059] The present invention is based on nuclear magnetic resonance technology to the optimization method of water flooding oil displacement speed, see figure 1 shown, including the following steps:

[0060] Step 1. Drill a core with a diameter of 2.5cm and a length of 5cm from the full-diameter core, wash and dry the core, and the gas permeability is 0.243md;

[0061] Step 2, preparing simulated formation water to achieve the salinity of the formation water;

[0062] Step 3, preparing simulated oil with a viscosity of 3.98mPa.s;

[0063] Step 4: The core is vacuumed and saturated with simulated formation water for 24 hours, the measured porosity is 6.71%, and the calculated pore volume is 1.65cm 3 ;The calculation formula of pore volume is:

[0064] V=πr 2 L×Φ (2)

[0065] Where r is the radius of the core in cm, L is the length of the core in cm, and Φ is the core porosity%;

[0066] Step five, use Mn-containing 2+ The simulated formation water with a concentration of...

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

No PUM Login to View More

Abstract

The invention discloses a method for determining an optimal a water driving speed in a dynamic water driving process of a tight oil reservoir. The method comprises the following steps: taking an experimental core, performing washing oil and drying, measuring a core porosity and a gas permeability, calculating a pore volume; configuring experimental simulation formation water to reach a mineralization of the formation water; configuring experimental simulation formation oil to reach a viscosity of an oilfield; displacing the core with the simulation formation water containing Mn<2+> to reach atleast 1.5 times of the pore volume, and replacing the simulation formation water; performing displacing by using the simulation oil to establish an initial oil saturation, and testing a nuclear magnetic resonance T2 spectrum; displacing the core with the simulation formation water containing Mn<2+>, and testing the nuclear magnetic resonance T2 spectrum; increasing the water driving speed, and testing the T2 spectrums at different displacing speeds; comparing the T2 spectrums tested at different displacing speeds with the T2 spectrum tested at the initial oil saturation; and calculating the oil driving efficiency at different displacing speeds to determine the optimal water driving speed. According to the method for determining the optimal water driving speed in the dynamic water drivingprocess of the tight oil reservoir, the oil driving efficiency in the dynamic water driving process of the tight oil reservoir is evaluated by utilizing the nuclear magnetic resonance technology, andthe error caused by different samples is avoided.

Description

technical field [0001] The invention relates to the technical field of oil and gas development and testing, in particular to a method for optimal water flooding speed in the dynamic water flooding process of tight oil reservoirs. Background technique [0002] The recoverable life of an oil field depends not only on the geological reserves of crude oil, but also on the development speed of the oil field. When the speed of water flooding is low, water can enter fewer oil displacement pores, which is not conducive to enhancing oil recovery, but the breakthrough speed of large pores is slower, and the displacement efficiency of large pores is higher. Therefore, there is an optimal water flooding speed in the process of water injection development. In the existing research, the patent CN108267561A announced the method and device for determining the injection rate of the indoor constant-velocity experiment; the patent CN106908470A announced a nuclear magnetic resonance high tempe...

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): G01N15/08G01N24/08
CPCG01N15/088G01N24/081Y02A90/30
Inventor 高辉宋星雷黄兴徐润滋王亚兰曹杰王琛窦亮彬赵金省
Owner XI'AN PETROLEUM UNIVERSITY
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
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