Experimental study on the characteristics of respiration effect in fractured formations

DAI Rui; MA Chuanhua; HUANG Honglin; WU Yanhui; LUO Ming; LI Wentuo; ZHANG Botao; GAO Reyu

doi:10.12143/j.ztgc.2025.01.013

2025 Vol. 52, No. 1

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Article navigation > DRILLING ENGINEERING > 2025 > 52(1): 93-101

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DAI Rui, MA Chuanhua, HUANG Honglin, WU Yanhui, LUO Ming, LI Wentuo, ZHANG Botao, GAO Reyu. 2025. Experimental study on the characteristics of respiration effect in fractured formations. DRILLING ENGINEERING, 52(1): 93-101. doi: 10.12143/j.ztgc.2025.01.013

Citation:

DAI Rui, MA Chuanhua, HUANG Honglin, WU Yanhui, LUO Ming, LI Wentuo, ZHANG Botao, GAO Reyu. 2025. Experimental study on the characteristics of respiration effect in fractured formations. DRILLING ENGINEERING, 52(1): 93-101. doi: 10.12143/j.ztgc.2025.01.013

Experimental study on the characteristics of respiration effect in fractured formations

1. CNOOC (China ) Co ., Ltd . Hainan branch, Haikou Hainan 570100, China;
2. Hainan Key Laboratory of Deep Sea Energy Engineering, Haikou Hainan 570100, China;
3. CNPC Engineering Technology R & D Company Limited, Beijing 102200, China

More Information

Corresponding author: HUANG Honglin

Received Date: 01 April 2024

Revised Date: 21 June 2024

Abstract

Abstract

When drilling deep fractured formation, the formation breathing effect caused by wellbore pressure fluctuation is easy to be misjudged as overflow and unnecessary killing measures are taken, which seriously affects the drilling safety. Therefore, an experimental equipment was developed to simulate the breathing effect of fractured formation. A series of experiments were carried out to analyze the effects of drilling fluid circulation pressure, fracture opening pressure and rock type on the characteristics of drilling fluid leakage and flowback. The results show that the fractured breathing effect is a reversible leakage, and the whole process of its occurrence is leakage-“quasi-steady”-flowback. With the increase of circulating pressure of drilling fluid, the maximum leakage and return amount of drilling fluid increased. With the increase of fracture opening pressure, the maximum leakage amount of drilling fluid increases, but the return amount decreases. Compared with sandstone and limestone, granite with extremely low porosity and low permeability has larger leakage and smaller return amount. The research results provide a theoretical basis for analyzing the characteristics of fractured breathing effect of deep fractured formation and adopting correct measures to distinguish other operating conditions.
- fractured formation /
- breathing effect /
- leakage and flowback /
- experimental simulation

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References

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