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

Shaft acidification blockage removal method for carbonate rock high-temperature high-pressure gas well

A high temperature and high pressure, carbonate rock technology is applied in the field of acidification and plugging removal of carbonate rock high temperature and high pressure gas wells and carbonate rock reservoir acidification plugging removal, which can solve the problems of many equipment, complicated operation and high cost. , to achieve the effect of improving the flow channel, simple operation and small number of equipment

Active Publication Date: 2021-10-01
PETROCHINA CO LTD
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned defects in the prior art, the present invention provides a wellbore acidizing plugging removal method for carbonate gas wells, which solves the need of conventional acidizing plugging removal methods Equipped with a separate flowback device on the ground, many equipments, and separate acid flowback, complicated operation and high cost

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
  • Shaft acidification blockage removal method for carbonate rock high-temperature high-pressure gas well
  • Shaft acidification blockage removal method for carbonate rock high-temperature high-pressure gas well
  • Shaft acidification blockage removal method for carbonate rock high-temperature high-pressure gas well

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1A

[0075] Example 1A Wellbore Acidizing and Plugging Removal

[0076] Block A belongs to the Keshen gas field, which is a high-temperature and high-pressure carbonate natural gas field. The well A (KeS8-A well) has a depth of 7116 meters, an original formation pressure of 123 MPa, and a bottom hole temperature of about 170 ° C. The thickness of this well is about 70 meters. , the average porosity is about 7%, and the column volume is about 25m 3 ; The oil pressure of the well can reach 97.69MPa in the early stage of production, and the daily natural gas production is about 78.01×10 4 m 3 ; During the production process, the oil pressure output continued to decline due to wellbore blockage. Before the construction of wellbore acidification and plugging removal, the oil pressure of the well dropped to 22.8MPa, and the daily natural gas production was 12.70×10 4 m 3 . It was decided to implement wellbore fixed-point acidizing and plugging removal construction.

[0077] Installa...

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 shaft acidification blockage removal method for a carbonate rock high-temperature high-pressure gas well. The method comprises the following steps that (1) two or more working liquid containing devices arranged in parallel are communicated with a shaft to be subjected to blockage removal treatment through a liquid pumping device A to form a first system, and the first system is controlled to enable shaft blockage to be corroded through an acidification reaction; and (2) a liquid inlet of a neutralizing device is communicated with the shaft to be subjected to blockage removal treatment, the liquid inlet of the neutralizing device is communicated with a liquid outlet of a neutralizing liquid containing device through a liquid pumping device B, the liquid outlet of the neutralizing device is communicated with a gas-liquid separation device in series, then a second system is formed, and the second system is controlled to discharge stratum fluid during gas well open flow production. According to the method, the operation and maintenance cost of a ground flowback device is omitted, the number of needed devices is small, the number of needed personnel is small, production organization is facilitated, and the method has very high practical application and popularization value.

Description

technical field [0001] The invention relates to the technical field of oil and gas field development, and relates to a method for acidizing and plugging removal of carbonate rock reservoirs, in particular to a method for acidizing and removing plugging of a wellbore for high-temperature and high-pressure gas wells in carbonate rocks. Background technique [0002] In the exploitation of oil and gas fields, especially natural gas fields, well plugging will occur as the use of gas wells prolongs. Depending on the stratigraphic composition and gas well depth in natural gas production areas, the location of plugging is also different. For example, it includes formation plugging, wellbore plugging, etc. The possible location of wellbore plugging includes tubing, the lower part of the wellbore, and annulus. Plug removal construction is an important link in natural gas production. [0003] At present, the carbonate gas wells that have been put into production in China are mostly hi...

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): E21B37/06E21B21/00E21B41/00
CPCE21B37/06E21B21/00E21B41/005
Inventor 吴红军王茜刘己全刘举孙涛唐胜蓝钟诚
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