Development of a mathematical model and experimental validation of borehole instability due to gravity displacement during drilling in a fractured formation

Xiao, Dianshi; Meng, Yingfeng; Gao, Li; Shu, Gang; Li, Shutao; Guo, Yuying

doi:10.1016/j.petrol.2018.05.030

Cited by 8 publications

(8 citation statements)

References 12 publications

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“…In contrast to the device described in the published literature (Xiao et al., 2018), this device replaces the air compressor with an asphalt heavy oil circulation system and can be used for oil drilling fluid gravity displacement. Table 1 lists the parameters of the experimental device.…”

Section: Experimental Study Of Liquid–liquid Gravity Displacementmentioning

confidence: 99%

Liquid–liquid gravity displacement in a vertical fracture during drilling: Experimental study and mathematical model

Xiao

Meng

Zhang

et al. 2019

Energy Exploration & Exploitation

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Gravity displacement often occurs when drilling a vertical fractured formation, causing a downhole complexity with risk of blowout and reservoir damage, well control difficulty, drilling cycle prolongation, and increased costs. Based on an experimental device created for simulating the gravity displacement, various factors affecting the displacement quantity were quantitatively evaluated by simulating the fracture width, asphalt viscosity, drilling fluid density, and viscosity under different working conditions, and a liquid–liquid displacement law was obtained. Using the theories of rock mechanics, fluid mechanics, and seepage mechanics, based on conformal mapping, as well as a fracture-pore double substrate fluid flow model, we established a steady-state mathematical model of fractured formation liquid–liquid gravity displacement by optimizing the shape factors and using a combination of gravity displacement experiments to verify the feasibility of the mathematical model. We analyzed the influence of drilling fluid density, fracture height and length, and asphalt viscosity on displacement rate, and obtained the corresponding laws. The results show that when the oil–fluid interface is stable, the fracture width is the most important factor affecting the gravity displacement, and plugging is the most effective means of managing gravity displacement.

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Section: Experimental Study Of Liquid–liquid Gravity Displacementmentioning

confidence: 99%

Liquid–liquid gravity displacement in a vertical fracture during drilling: Experimental study and mathematical model

Xiao

Meng

Zhang

et al. 2019

Energy Exploration & Exploitation

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“…16 Some laboratory experiments of gas-liquid gravity displacement have been done with similar experimental devices. [13][14][15][17][18][19][20] The devices consisted of three parts: a wellbore-fracture-formation system, a circulation system, and a data acquisition system. The wellbore-fracture-formation system included a wellbore module, a fracture module, and a formation module.…”

Section: Introductionmentioning

confidence: 99%

“…Many scholars believe that the fracture width is more sensitive to the gas displacement rate and volume and the mud viscosity clearly inhibits gas-liquid gravity displacement. 16,18,19 The relationships between mud density, fracture width, and mud viscosity with displacement amount are linear, logarithmic, and exponential, respectively. 20 We have found that foreign scholars focus on studying drilling-fluid loss and kick in wellbores without considering the conditions of gas leakage and kick occurring simultaneously in a fracture.…”

Section: Introductionmentioning

confidence: 99%

“…The Rogaland Research Kick Simulator (RF‐Kick) has been introduced to simulate lost circulation, and the behavior and reaction to killing operations were supervised during a kick situation . Some laboratory experiments of gas‐liquid gravity displacement have been done with similar experimental devices . The devices consisted of three parts: a wellbore‐fracture‐formation system, a circulation system, and a data acquisition system.…”

Section: Introductionmentioning

confidence: 99%

“…The wellbore‐fracture‐formation system included a wellbore module, a fracture module, and a formation module. Many scholars believe that the fracture width is more sensitive to the gas displacement rate and volume and the mud viscosity clearly inhibits gas‐liquid gravity displacement . The relationships between mud density, fracture width, and mud viscosity with displacement amount are linear, logarithmic, and exponential, respectively…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology

Tang

Chen

et al. 2019

Energy Science & Engineering

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Gas‐liquid displacement occurs often in fractured gas reservoirs, and can cause gas kick and mud leakage, resulting in a very high risk of losing well control. To analyze gas‐liquid displacement between borehole and gassy fracture, we used computational fluid dynamics to simulate its behaviors. We also used response surface methodology (RSM) to design numerical experiments. The effects of fracture width, bottom‐hole differential pressure, mud density, mud viscosity, and mud displacement were taken into account. We used RSM to determine the influence of the multifactor interaction of gas‐liquid displacement and established an empirical formula for the gas displacement rate. The results show that gas‐liquid displacement is proportional to fracture width, bottom‐hole differential pressure, mud density, and mud displacement; however, the displacement is inversely proportional to mud viscosity. The sensitivity sequence of the gas‐liquid displacement rate is fracture width > bottom‐hole differential pressure > mud viscosity > mud density > mud velocity. The impact of fracture width is clearly higher than that of the other factors, while the mud velocity has almost no impact. Our established empirical formula can be used to predict bottom‐hole gas kick and drilling mud leakage and to inversely predict the fracture width and formation gas pressure.

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Simulation Study of Large-Slope Well Leakage in Carbonate Fracture-Cave Reservoirs

Duan,

Gao,

Yin

et al. 2024

Mechanisms and Machine Science

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Development of a mathematical model and experimental validation of borehole instability due to gravity displacement during drilling in a fractured formation

Cited by 8 publications

References 12 publications

Liquid–liquid gravity displacement in a vertical fracture during drilling: Experimental study and mathematical model

Liquid–liquid gravity displacement in a vertical fracture during drilling: Experimental study and mathematical model

Numerical investigation of gas‐liquid displacement between borehole and gassy fracture using response surface methodology

Simulation Study of Large-Slope Well Leakage in Carbonate Fracture-Cave Reservoirs

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