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

Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving

A technology of carbon dioxide and auxiliary steam, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., which can solve the problems of low recovery rate, difficulty in meeting the requirements of steam flooding, and low oil-steam ratio.

Active Publication Date: 2011-04-20
PETROCHINA CO LTD
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Overcome the problem of low production period and long production period of existing steam flooding
Solve the problem that the dryness of traditional single steam injection in deep heavy oil reservoirs cannot meet the requirements of steam flooding, resulting in low oil-steam ratio and low recovery

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 developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving
  • Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving
  • Method for developing deep-layer heavy crude reservoir by carbon dioxide auxiliary steam driving

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: refer to accompanying drawing 3. The method for developing deep heavy oil reservoirs by carbon dioxide assisted steam flooding of the present invention has been tested in an oil field. This oilfield is suitable for the development of combined steam flooding of vertical wells and horizontal wells assisted by carbon dioxide injection after high rounds of steam huff and puff in deep heavy oil reservoirs. After long-term steam stimulation, the pressure has dropped below 3MPa, and the remaining oil is mainly distributed in the interwell area, which is suitable for the steam flooding development method of replenishing energy to the formation. Therefore, if an infill horizontal well is drilled between wells with abundant remaining oil, it will first huff and puff for 2 to 3 cycles. After thermal communication with the vertical well is established, it can be transferred to the vertical well for carbon dioxide and steam injection. .

[0037] The specific method i...

Embodiment 2

[0054] The buried depth of an oilfield reservoir is 1300m, the effective thickness of the oil layer is 30.0m, the net total thickness ratio of the oil layer is 0.65, the average porosity is 22.0%, the average permeability is 1000md, the coefficient of variation of permeability is 0.60, and the viscosity of crude oil under the oil layer conditions is 400- 500cp. The oil field has been developed by steam stimulation for 15 years, the formation water content is relatively high, the recovery degree of the steam stimulation stage is 20.0%, and the formation pressure is 4-5 MPa. Carbon dioxide assisted steam flooding was used to develop deep heavy oil reservoirs in this oilfield.

[0055] A. Selecting reservoirs suitable for CO2 assisted steam flooding

[0056] According to the geological characteristics and development status of the oilfield, rough screening of the oilfield is carried out. Reservoirs suitable for carbon dioxide-assisted steam flooding meet the following condition...

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

A method to excavate deep heavy oil reservoir with carbon dioxide auxiliary steam drives is provided, which adapts to oil field exploitation. The method is characterized by exploiting deep heavy oil reservoir with a composite rod drive for straight wells and horizontal wells. Meanwhile, the invention is designed to fill carbon dioxide gas at the same time of filling steam. The specific value of underground volume in cold water equivalent weight between the carbon dioxide and steam is 8 to 10; total injection volume of the carbon dioxide is 0.2 to 0.5PV. The targets are that: solving the problem that, the traditional method of only injecting steam into deep heavy oil reservoirs is difficult to meet with steam drive requirements, so that oil-steam ratio and percent recovery are both too low. After meeting cold oil at the early stage of transcending condensed water, the carbon dioxide can solve some raw oil, lower viscosity, improve raw oil fluidity, shorten low-yield period in the preliminary stage of the steam drive, and improve oil recovery speed. On the basis of steam throughput, the method can improve yield extent by about 30 percent, and accumulated oil-steam ratio can be higher than 0.20; taking yield extent during the throughput stage into considerations, total percent recovery can reach about 50 percent.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a method for exploiting heavy oil by high-pressure steam flooding. It is a method of using carbon dioxide assisted steam flooding to increase the recovery rate and oil recovery rate of heavy oil reservoirs after oilfield steam huff and puff. Background technique [0002] In the oil recovery process of heavy oil reservoirs, the steam flooding oil recovery technology used is the successor technology of steam huff and puff oil recovery. As shown in Figure 1, it is a conventional vertical well steam flooding reverse nine-point well pattern. Conventional steam flooding adopts a well pattern consisting of vertical wells and vertical wells. The steam injection well 1 in the center continuously injects steam into the well, and the adjacent production wells 2 around it continuously produce crude oil. Theoretical research and field practice at home and abroad show that the ...

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): E21B43/24
Inventor 高永荣闫存章刘尚奇沈德煌郭二鹏
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