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

Steam-huff-and-puff oil production method assisted by injection of air and carbon dioxide

A carbon dioxide and auxiliary steam technology, which is applied in the fields of fluid production, earth-moving drilling, wellbore/well components, etc., can solve the problems of not very large energy enhancement effect, limited application scale, adverse environmental impact, etc., to improve the production rate , the effect of reducing cold damage and improving oil recovery

Active Publication Date: 2017-05-10
PETROCHINA CO LTD
View PDF11 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, due to the influence of the price of carbon dioxide and its main function is to reduce the viscosity of crude oil, its high solubility in crude oil can easily achieve the effect of miscible flooding, so its energy-enhancing effect is not very large. Its application scale is limited
At present, the technology of incinerating oil reservoirs has been applied on a large scale in some blocks of Liaohe Oilfield, which has played a pivotal role in fully utilizing the production capacity of the reservoir. The large amount of tail gas produced by incinerating oil reservoirs has a high content of carbon dioxide, but only part of it has been recycled, and the surplus part is Exhausted into the atmosphere, which has brought adverse effects on the environment

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
  • Steam-huff-and-puff oil production method assisted by injection of air and carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0046] This embodiment provides an air injection and carbon dioxide assisted steam huff and puff oil recovery method, which includes the following steps:

[0047] Step 1. Set injection and production wells and adjacent wells: take the injection and production wells as the center, and the adjacent wells in the same oil layer as the radius, and divide the surrounding adjacent wells with one well spacing, two well spacing, and three times well spacing respectively Adjacent wells on the first line, adjacent wells on the second line, and adjacent wells on the third line;

[0048] On-line measurement of oxygen content in casing gas of injection wells and adjacent wells;

[0049] Step 2. On-line determination of the oxygen content of the casing gas in the injection well is higher than the explosion point, inject carbon dioxide (or nitrogen or a mixture of carbon dioxide and nitrogen) into the injection well, and use the casing gas of the injection well to The oxygen content is lower...

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 steam-huff-and-puff oil production method assisted by injection of air and carbon dioxide. The method includes the following steps that (1) an injection well and an adjacent well are arranged, and the oxygen content of casing pipes of the injection well and the adjacent well is measured online; (2) when the online measured oxygen content of the injection well casing pipe is higher than an explosion point, nitrogen and / or carbon dioxide are / is injected into the injection well, and the content of oxygen content of the injection well casing pipe, which is lower than the explosion point, is an injection finishing point; (3) the gas mixture of air and carbon dioxide is injected till the total reaches a design discharge, and after the injection is finished, a carbon dioxide slug killing well is used, and then steam is injected; or a gas mixture slug of air and carbon dioxide is injected, a steam slug is injected, then the gas mixture slug and the steam slug are injected continuously, circularly and alternately till the gas mixture slug injection total reaches the design discharge, and after the circular injection is finished, the carbon dioxide slug killing well is used; (4) the well is soaked till the pressure inside the well reaches a normal pressure, and blowout production is carried out.

Description

technical field [0001] The invention relates to an oil recovery method assisted by air injection and carbon dioxide steam huff and puff, which belongs to the technical field of oil exploitation. Background technique [0002] Liaohe Oilfield is an oilfield dominated by heavy oil. With the prolongation of the steam huff and puff period, the deficit in the formation increases, and the production decline also accelerates; moreover, the large amount of water in the formation also seriously reduces the efficiency of heat energy utilization, which increases the development cost and deteriorates the mining benefit. Therefore, it is becoming more and more important for the follow-up development of heavy oil fields to explore new technologies and new production models to enhance the recovery factor and oil-gas ratio of heavy oil and super heavy oil. [0003] The patent application with the application number 200910011365.3 discloses a "formation catalytic oxidation heavy oil thermal ...

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): E21B43/24E21B43/16
CPCE21B43/164E21B43/168E21B43/24
Inventor 王书慧管九洲李峻宇刘佳声贾海舰杨帆向峥关跃斌单德志田玉秋
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