A method for fracturing reconstruction of ultra-deep reservoirs

By combining acidizing, temporary plugging, and solid capsule acidizing, the fracturing challenges of ultra-deep reservoirs have been solved, forming a complex fracture network and improving the extraction efficiency and production of oil and gas resources.

CN121630347BActive Publication Date: 2026-06-12CHINA UNIV OF PETROLEUM (BEIJING)
View PDF 3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Filing Date
2025-12-03
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing hydraulic and acid fracturing methods are difficult to effectively increase net pressure in ultra-deep reservoirs, temporary plugging within fractures is challenging, and the activation efficiency of natural fractures is low, leading to difficulties in the exploitation of oil and gas resources in ultra-deep reservoirs.

Method used

A combined fracturing method involving acidizing, temporary plugging, and solid capsule acidizing is employed. Through acid pretreatment, primary fracturing, temporary plugging, solid capsule acidizing, and secondary fracturing, a complex fracture network is formed, reducing rock fracture pressure, activating natural weak surfaces, and creating new fractures.

Benefits of technology

Effective fracturing of ultra-deep reservoirs has been achieved, forming a complex fracture network, which has improved the extraction efficiency and production of oil and gas resources and enhanced oil and gas circulation capacity.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure FT_1
    Figure FT_1
Patent Text Reader

Abstract

The application provides a method for fracturing reconstruction of an ultra-deep reservoir. The method comprises the following steps: before fracturing a target ultra-deep reservoir, injecting acid liquid into the target ultra-deep reservoir, and carrying out soaking after the acid liquid is injected; carrying out first fracturing on the target ultra-deep reservoir to form a main crack; injecting a temporary plugging agent into the target ultra-deep reservoir to plug the front end of the main crack formed in the target ultra-deep reservoir; injecting solid capsule acid into the target ultra-deep reservoir in which the front end of the main crack is in a temporary plugging state, the solid capsule acid enters the main crack formed in the target ultra-deep reservoir, and soaking is carried out after the solid capsule acid reaches a predetermined position; during the soaking process, the capsule coating of the solid capsule acid is degraded and the acid core is released under the temperature and pressure conditions in the target ultra-deep reservoir; and carrying out second fracturing on the target ultra-deep reservoir in which the front end of the main crack is in a temporary plugging state and the solid capsule acid acidification has been completed to form a secondary crack.
Need to check novelty before this filing date? Find Prior Art