Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Gas flooding of heavy oil blocks developed by water flooding with associated gas after desulfurization by steam flooding

An associated gas and steam flooding technology, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems such as poor water flooding effect, poor water flooding development effect, low permeability, etc., to achieve Eliminate the risk of polluting the environment, improve the affinity of the oil-water interface, and have strong on-site operability

Active Publication Date: 2021-03-30
PETROCHINA CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of water flooding development, due to the influence of low permeability, low porosity and other reservoir properties and the fluid properties of crude oil with a certain viscosity, the effect of water flooding is not good, resulting in poor water flooding development effect year by year
Nitrogen foam flooding has also been implemented for this type of ordinary heavy oil block to improve the development effect, but because nitrogen needs to be purchased, the cost is high
In the above application process, it is not mentioned that the associated gas produced by the oil well is directly used for gas flooding

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

Embodiment 1

[0041] This embodiment provides a foaming agent suitable for gas flooding and oil flooding in heavy oil blocks developed after desulfurization by steam flooding, wherein, based on the total weight of the foaming agent as 100%, its Contains 2.1% fatty acid alkanolamide, 5% alkylphenol polyoxyethylene ether, 8% polyoxyethylene alkyl alcohol ether-10 and 6.5% polyoxyethylene alkyl alcohol ether-20 and the balance of water;

[0042] The concrete preparation steps of this whipping agent provided by the present embodiment are as follows:

[0043] According to the ratio, add fatty acid alkanolamide, alkylphenol polyoxyethylene ether, polyoxyethylene alkyl alcohol ether-10, and polyoxyethylene alkyl alcohol ether-20 into the mixing tank in turn, and mix at room temperature for 8 hours. obtaining foaming active components;

[0044] Then add the obtained foaming active component into the clear water of the target ratio (78.4%) to obtain the foaming agent.

Embodiment 2

[0046] This embodiment provides a method for gas flooding a common heavy oil block developed by water flooding by using associated gas after desulfurization by steam flooding, which includes the following steps:

[0047] A common heavy oil water injection development block, the density of crude oil is 0.954mg / cm 3 , at 50°C, the viscosity of degassed crude oil is 333mPa·s, the wax content is 5-8%, the average asphaltene plus gum content is 18-25%, and the freezing point is -16°C. For a water injection well in this ordinary heavy oil water injection development block, the average formation pressure is 6.2MPa, the original formation temperature is 51°C, the injection well injection pressure is 7.8MPa, and there are 8 effective wells. During the normal injection process, the average daily fluid production The average daily oil production is about 11 tons. After stopping the water injection for half a year, the average daily liquid production is 90 cubic meters, and the average da...

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 provides a gas flooding method for water flooding development thick oil blocks by the aid of steam flooding desulfurized associated gas. The gas flooding method includes sequentially injecting the steam flooding desulfurized associated gas and foaming agents into injection wells in the thick oil blocks. The foaming agents are applicable to the steam flooding desulfurized associated gas for displacing oil for the water flooding development thick oil blocks by means of gas flooding. The gas flooding method has the advantages that the steam flooding desulfurized associated gas and the neutral foaming agents are injected into the injection wells, crude oil can be driven under synergistic effects of the steam flooding desulfurized associated gas and the neutral foaming agents to flow towards oil wells with good connectivity, and accordingly the purpose of increasing the yields of water flooding development common thick oil blocks can be achieved.

Description

technical field [0001] The invention relates to a method for gas flooding a heavy oil block developed by water flooding with associated gas after desulfurization by steam flooding, and belongs to the field of oilfield application technology. Background technique [0002] Oil well associated gas refers to the gas that appears with petroleum liquids between oil layers during the production of oil fields. Its main component is methane, and usually contains a large amount of ethane and heavy hydrocarbon components. For the oil well associated gas that can be ignited, the common practice in this field is to collect it in a centralized manner, and use it as fuel for the heating furnace after treatment. [0003] The shifting development of steam flooding changes the components of the associated gas produced by the oil well, and gradually increases the harmful gas components such as hydrogen sulfide, making the associated gas produced by the oil well unusable. According to prelimin...

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 Patents(China)
IPC IPC(8): C09K8/594E21B43/16E21B43/22
CPCC09K8/594E21B43/166
Inventor 段效威马春宝肖家宏高玉军贾财华孙强张淑颖程彦符刘伟贾凯胡京生金龙汪宁乔诗涵
Owner PETROCHINA CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap 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