温欣, 靳继凯, 陈艳华,等.压裂液泵注速率对深海能源土水力压裂裂缝起裂规律研究[J].河南理工大学学报（自然科学版）,2026,45(6):23-31.

Wen X, Jin J K, Chen Y H, et al.Effects of fracturing fluid pumping rate on fracture initiation behavior in hydraulic fracturing of methane hydrate-bearing sediments[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(6):23-31.

压裂液泵注速率对深海能源土水力压裂裂缝起裂规律研究

温欣1,2, 靳继凯1,2, 陈艳华1, 张艺博1

1.华北理工大学 建筑工程学院，河北 唐山  063210；2.河北省岩土工程防灾减灾应用技术协同创新中心，河北 唐山  063299

摘要: 目的 针对压裂液泵注速率对深海能源土水力压裂裂缝起裂规律尚不清楚的问题，开展压裂液泵注速率对深海能源土水力压裂裂缝起裂规律和裂缝特征研究。  方法 自主制备深海能源土试样并通过研发一套深海能源土多场耦合下水力压裂多功能试验模拟装置，分别设置压裂液泵注速率为1，1.5，3，5，8，10 mL/s，对深海能源土进行水力压裂试验，分析压裂液泵注速率对深海能源土压裂的影响，并揭示深海能源土裂缝扩展机理。  结果 结果表明：压裂液泵注速率对深海能源土水力压裂裂缝起裂压力有显著影响，随着压裂液泵注速率增大，起裂压力逐渐增大，但压裂液泵注速率具有一个阈值（本文为5 mL/s），超过该阈值后起裂压力反而下降。深海能源土水力压裂裂缝主要沿着层理面起裂，不同压裂液泵注速率下，裂缝形态变化差异较大。深海能源土水力压裂中形成复杂裂缝为Y字型，主要体现为垂直拉伸裂缝与水平拉伸裂缝。压裂液泵注速率和起裂时间及注入量有较强的关联性。  结论 研究结果揭示了水力压裂深海能源土储层裂缝演变规律，可为水力压裂技术在天然气水合物开发中的应用提供参考依据。

关键词:深海能源土;水力压裂;起裂规律;裂缝特征

doi:10.16186/j.cnki.1673-9787.2024030065

基金项目:国家自然科学基金资助项目（51378172）；河北省高等学校科学技术研究项目（ZC2024147）

收稿日期:2024/03/25

修回日期:2024/08/15

出版日期:2026/10/09

Effects of fracturing fluid pumping rate on fracture initiation behavior in hydraulic fracturing of methane hydrate-bearing sediments

Wen Xin1,2, Jin Jikai1,2, Chen Yanhua1, Zhang Yibo1

1.College of Civil and Architectural Engineering， North China University of Science and Technology， Tangshan  063210， Hebei， China；2.Hebei Collaborative Innovation Center for Applied Technology of Geotechnical Engineering Disaster Prevention and Mitigation， Tangshan  063299， Hebei， China

Abstract: Objectives To address the fact that the effects of the fracturing fluid pumping rate on the fracture initiation behavior and fracture characteristics of methane hydrate-bearing sediments remain unclear， the fracture initiation behavior and fracture characteristics of these sediments under hydraulic fracturing were investigated.  Methods Methane hydrate-bearing sediment specimens were prepared independently， and a multifunctional experimental simulation apparatus for hydraulic fracturing under multi-field coupled conditions was developed. Hydraulic fracturing tests were conducted on the specimens at fracturing fluid pumping rates of 1， 1.5， 3， 5， 8 and 10 mL/s. The effects of fracturing fluid pumping rate on hydraulic fracturing of methane hydrate-bearing sediments were analyzed， and the fracture propagation mechanism was investigated.  Results The results show that the fracturing fluid pumping rate has a significant effect on the fracture initiation pressure of methane hydrate-bearing sediments. The fracture initiation pressure gradually increases with increasing fracturing fluid pumping rate.  However， there is a threshold pumping rate of 5 mL/s， above which fracture initiation is promoted. Hydraulic fractures in methane hydrate-bearing sediments mainly initiate along bedding planes， and the fracture morphology varies considerably at different fracturing fluid pumping rates. The complex fractures formed during hydraulic fracturing are mainly Y-shaped and consist primarily of vertical and horizontal tensile fractures.  The fracturing fluid pumping rate is strongly correlated with fracture initiation time and injection volume.  Conclusions The study reveals the fracture evolution characteristics of hydraulic fracturing in methane hydrate-bearing sediment reservoirs and provides a reference for the application of hydraulic fracturing technology to natural gas hydrate development.

Key words: methane hydrate-bearing sediments; hydraulic fracturing; fracture initiation behavior; fracture characteristics