Project Full Name：Characterization of Fracture Morphology and Intelligent Monitoring Technology forFracturing Stimulation in Deep Unconventional Oil and Gas

Company：Tongii University

Awarded：Stimulation & EOR Technology

Standeard:  International  Advanced Level

Projec Number：ECF-2024-SEP-1005

Principal Accomplishers： Tang Jizhou, Chen Weihua, Meng Siwei, Wang Hancheng, Huang Famu, Yang Xun, Zhao Zhengguang, Zhang Zhuo,Tao Jiaping

Key Innovation Points：

1. By developing geological mechanics parameter prediction technology and establishing a dataand physics-based model dual-driven sweet spot evaluation system to guide geological modelingand the selection offavorable areas.2. By analyzing the coupling mechanism ofmulti-physical fields in hydraulic fracturing andestablish boundary element-based cross-scale dynamic evolution characterization technology forhydraulic fractures.

3. By innovating hydraulic fiacturing microseismic data interpretation methods and establish afacturing efiectiveness evaluation technology based on microseismic event attributes.4. By exploring the mechanical and physical evolution laws of fractured reservoirs and developpost-fracturing production evaluation technology based on the embedded discrete fracture model

Main Application and Technical Principal： 

This technology is a set of fracture morphology characterization and intelligent monitoringtechnologies suitable for deep unconventional oil and gas fracturing modifications, including: 1.Effi ciently ut ilize data-driven methods to accurately predict reservoir geomechanical parametersconstruct unconventional reservoir geological models, and, in combination with the energyevolution method, develop comprehensive sweet spot prediction technology, effectively guiding target identification. 2. Addressing the multi-field coupling mechanism offlow-solid-thermal.chemical-stress in deep reservoir modifications, propose a boundary element-based cross-scalehydraulic firacture dynamic evolution characterization technology strategy, promoting iterativeupgrades of fracturing process optimization technologies. 3. Addressing the establishment ofindicators for hydraul ic fracturing evaluation, propose a method of fracture interpretation based onmicroseismic event attributes in order to enhance well completion process optimization measures4. By establishing an interface between fracture characterization and reservoir simulation, improvepost-firacturing production evaluation technology to eftectively guide production enhancement forindividual wells.

Technology Application： 

This technology has been promoted in the West-East Gas Transmission Branch of the National Petroleum Gas Pipeline Network Group Company Limited, and has been successfully applied to solve the problem that the reservoir in which the 10-billion-square-foot gas storage reservoir (Wen 23 Gas Storage Reservoir of the West-East Gas Transmission Company) is located has serious non-homogeneous nature, and the reservoir has experienced many rounds of fracturing during the development of the reservoir, which has caused complex geological conditions of the reservoir gas and difficulty in recognizing the geological characteristics. By analyzing the evolution laws of elastic properties, pre-peak dissipation energy, post-peak fracture energy and other strain energies during the transition from plastic deformation to brittle fracture of rock materials from the energy perspective, and combining well logging data, the key energies affecting the brittleness of rock are identified, and the influence of geostress is combined with the rock brittleness index to carry out the evaluation of the fracturability of the reservoir for single-and-repeated fracturing. This innovative understanding will provide geomechanical theoretical support for the safe service and peak regulation of Wen 23 gas storage reservoir, and play a positive role in ensuring the safety of gas consumption in Shanghai. The promotion prospect is good. Based on the results of this technology, it is recognized that the low modulus and fracturability index are conducive to the improvement of gas production and peak regulation capacity of gas storage reservoirs.