Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for nitrogen fracturing and yield increasing of low-pressure coal-bed gas well

A coalbed methane well and nitrogen technology, which is applied in earthwork drilling, wellbore/well components, gas discharge, etc., can solve the problems of high cost, high reservoir pollution, slow gas breakthrough, etc., to reduce methane partial pressure and improve storage capacity. Layer permeability, easy seam making effect

Inactive Publication Date: 2015-05-13
SHANXI LUAN ENVIRONMENTAL ENERGY DEV +2
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Conventional hydraulic fracturing has unavoidable disadvantages when stimulating production of low-pressure coalbed methane wells. The main disadvantages are: high pollution to the reservoir, high cost, not suitable for dry reservoir stimulation, difficult flowback, slow gas breakthrough, etc.

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 nitrogen fracturing and yield increasing of low-pressure coal-bed gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] The invention provides a nitrogen foam fracturing method for coalbed gas wells in low-pressure and low-permeability reservoirs.

[0014] The present invention comprises the following steps:

[0015] (a) Prepare the amount of liquid nitrogen that needs to be pumped into the coal seam in advance according to the design scale of fracturing;

[0016] (b) Wellheads of coalbed methane wells, liquid nitrogen pump trucks and related pipeline valves are well connected;

[0017] (c) Conduct pressure test according to fracturing design requirements to ensure that there is no puncture or leakage of high-pressure manifold;

[0018] (d) The liquid nitrogen pump truck shall pump nitrogen according to the fracturing design requirements, and the nitrogen discharge temperature shall not be lower than 15°C;

[0019] (e) After the fracturing is completed, the well should be shut down and the well should be blocked. When the wellhead pressure drops to half of the pump stop pressure, the w...

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 novel technique for nitrogen fracturing and yield increasing of a low-pressure coal-bed gas well. According to the technique, a liquid nitrogen pumping truck pumps nitrogen into a coal bed. The technique has the advantages that pollution to the reservoir is light, the filter loss is small, the backflow effect is good, and formed fractures are complicated. The technique is suitable for fracturing and transforming of the low-pressure coal-bed gas well; meanwhile, methane differential pressure can be reduced and the permeability of the reservoir can be improved through nitrogen, gas in the coal-bed gas well can be desorbed rapidly, and the gas production rate can be increased easily.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a new method for increasing production by nitrogen fracturing of low-pressure coalbed gas wells. Background technique [0002] Conventional hydraulic fracturing has unavoidable disadvantages when stimulating production of low-pressure coalbed methane wells. The main disadvantages are: high pollution to the reservoir, high cost, unsuitable for dry reservoir stimulation, difficult flowback, and slow gas breakthrough. In view of the above disadvantages, the present invention, that is, a new technology for production stimulation by nitrogen fracturing of low-pressure coalbed methane wells, has advantages that conventional hydraulic fracturing cannot have. Contents of the invention [0003] In view of the above problems, the present invention provides a new method for increasing production by nitrogen fracturing of low-pressure coalbed gas wells. ...

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
IPC IPC(8): E21B43/26E21F7/00
CPCE21B43/26E21B43/006E21F7/00
Inventor 冯培文曹运兴柴学周贾猛刘同吉周文豪周丹曹永恒田林
Owner SHANXI LUAN ENVIRONMENTAL ENERGY DEV
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com