Steam and nitrogen composite swallowing-spitting oil extraction method

A steam and nitrogen technology, which is used in the production of fluids, earthmoving, wellbore/well components, etc., to reduce production costs and crude oil viscosity, large drainage area, and increase driving energy.

Inactive Publication Date: 2011-08-10
CHINA PETROLEUM & CHEM CORP +1
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these technologies can achieve certain effects, the above-mentioned technologies can only meet one of the requirements for the development of shallow super-heavy oil reservoirs, and cannot solve the production problems of shallow super-heavy oil reservoirs well and comprehensively. Therefore, there is still a need in this field for a new type of shallow ultra-heavy oil reservoir recovery technology, which can simultaneously reduce the viscosity of crude oil, replenish formation energy, reduce steam injection pressure, prevent steam overburden, and increase the drainage area.

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 and nitrogen composite swallowing-spitting oil extraction method
  • Steam and nitrogen composite swallowing-spitting oil extraction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The method proceeds as follows:

[0026] a. Downstream steam injection pipe string: the pipe string structure is from bottom to top, the uniform steam distribution pipe string with uniform steam distribution valve and compensator, the upper part is connected to the injection and production integrated pump, and the outer diameter of the pump is Φ88.9mm tubing, The wellhead is installed with subcritical steam injection wellhead.

[0027] b. Note N 2 And steam: inject 25000Nm into the oil well 3 Nitrogen and 2,500 tons of steam, the steam is injected from the oil pipe, and the nitrogen is injected from the oil jacket annulus. During the steam injection process, pay attention to record the change of the steam injection pressure, so as to adjust the steam injection parameters and the injection speed of nitrogen according to the pressure in time, so that the steam injection is uniform throughout the process. Nitrogen injection;

[0028] c. Stewing well: After injecting ste...

Embodiment 2

[0033] The method proceeds as follows:

[0034] a. Downstream steam injection pipe string: the pipe string structure is from bottom to top, the uniform steam distribution pipe string with uniform steam distribution valve and compensator, the upper part is connected to the injection and production integrated pump, and the outer diameter of the pump is Φ88.9mm tubing, The wellhead is installed with subcritical steam injection wellhead.

[0035] b. Note N 2 And steam: inject 55000Nm into the oil well 3 Nitrogen and 1,500 tons of steam, the steam is injected from the oil pipe, and the nitrogen is injected from the oil jacket annulus. During the steam injection process, pay attention to record the change of the steam injection pressure, so as to adjust the steam injection parameters and the injection speed of nitrogen according to the pressure in time, so that the steam injection is uniform throughout the process. Nitrogen injection;

[0036] c. Stewing well: After injecting ste...

Embodiment 3

[0041] The method proceeds as follows:

[0042] a. Downstream steam injection pipe string: the pipe string structure is from bottom to top, the uniform steam distribution pipe string with uniform steam distribution valve and compensator, the upper part is connected to the injection and production integrated pump, and the outer diameter of the pump is Φ88.9mm tubing, The wellhead is installed with subcritical steam injection wellhead.

[0043] b. Note N 2 And steam: inject 40000Nm into the oil well 3 Nitrogen and 2,000 tons of steam, the steam is injected from the oil pipe, and the nitrogen is injected from the oil jacket annulus. During the steam injection process, pay attention to record the change of the steam injection pressure, so as to adjust the steam injection parameters and the injection speed of nitrogen according to the pressure in time, so that the steam injection is uniform throughout the process. Nitrogen injection;

[0044] c. Stewing well: After injecting ste...

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-and-nitrogen composite swallowing-spitting oil production method, comprising the following steps: a, steam injection string laying: a pipe column structure successively comprises an even steam distribution pipe column provided with an even steam distribution valve and a compensator, an injection and extraction integrated pump connected to the even steam distribution pipe column, an oil pipe arranged on the pump, and a subcritical steam injection well from bottom to top; b, N2 and steam injection: steam is injected through an oil jacket annulus, meanwhile, nitrogen is injected into an oil well through the oil pipe, nitrogen injection speed is regulated to evenly allocated and injected during the whole steam injection process; c, soaking: soaking is carried out for 2-7 days after steam injection and nitrogen injected are over; d, blowout: when the well pressure drops to 0.5Mpa / day, blowout is controlled by an oil nozzle; and e, pumping start: when open-flow liquid amount reaches 3t / d, the injection and extraction integrated pump is used to start pumping.

Description

Technical field: [0001] The invention relates to the technical field of oil recovery in oilfields, in particular to a combined steam and nitrogen huff and puff oil recovery method for shallow ultra-heavy oil reservoir exploitation, medium-depth ultra-heavy oil reservoir exploitation and shallow extra-heavy oil reservoir exploitation. Background technique: [0002] For shallow ultra-heavy oil reservoirs, in addition to reducing the viscosity of crude oil and increasing the fluidity of heavy oil, since the oil layer is buried shallowly, the formation pressure is low, and the driving force for crude oil to flow in the oil layer is small, it is also necessary to supplement formation energy. To achieve economical and effective development. At the same time, during the steam injection process of shallow ultra-heavy oil reservoirs, there are still high steam injection pressures, which are easy to fracture the formation. After the formation is fractured, the steam will flow along t...

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): E21B43/00E21B43/10E21B43/24E21B43/12
Inventor 毕义泉王金铸宋明水张广卿乔明全荣雁马瑞国栾传振孙建芳盖平原侯帅军
Owner CHINA PETROLEUM & CHEM CORP
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