Smart plugging and low-damage foam drilling fluid technology for CBM drilling

Li, Zhiyong; Zhou, Yi; Qu, Long; Zhang, Xufei

doi:10.1504/ijogct.2023.128050

Cited by 3 publications

(3 citation statements)

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“…where ρ m is the density of the drilling fluid, kg/m 3 ; v m is the drilling fluid velocity, m/s; γ is the gas content, dimensionless [29].…”

Section: Liquid-phase Control Equationmentioning

confidence: 99%

“…Because the time for gas invasion of the above-mentioned fractures is less than 0.4 s, Figure 13 shows the morphological distribution of the gas and liquid phases in the wellbore and fractures at 0.4 s of five fracture widths. With the increase in the fracture width, the volume occupied by the liquid phase in the model becomes larger and larger, and the volume of the gas phase entering the wellbore also increases [29]. This is because a fracture with larger width has less flow resistance.…”

Section: Effect Of Fracture Widthmentioning

confidence: 99%

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Study on Gas Invasion Behavior of Gas–Liquid Displacement in Fractured Reservoirs

et al. 2022

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When drilling or exploiting fractured formations, gas fluid displacement and invasion often occur, and gas invasion is very subtle and difficult to find. The gas in the fracture enters the wellbore and arrives near the wellhead with the drilling fluid. Improper treatment may lead to serious accidents such as lost circulation and blowout. In this study, using computational fluid dynamics (CFD) simulation software for modeling and grid generation, based on the volume of fluid (VOF) method, the gas invasion behavior under different conditions was simulated to explore the flow process and characteristics of gas invasion, and the effects of different drilling fluid properties and fracture morphology on gas invasion were analyzed. The experimental results show that the drilling fluid enters the fracture to compress the gas, making the pressure in the fracture greater than that in the wellbore, thus leading to the occurrence of gas invasion. The viscosity and density of the drilling fluid have different effects on the gas invasion process. The higher the viscosity, the smaller the possibility of gas invasion. However, when the viscosity of the drilling fluid gradually increases from 10–50 MPa·s, the change of gas invasion rate is small, all within 1.0–1.2 m/s. The higher the density, the more conducive to the occurrence of gas invasion. The inlet pressure has no obvious effect on the occurrence of gas invasion, and the occurrence time of the gas invasion fluctuates in 0.35 s at 0.5–2.5 MPa. With the increase in the fracture width and length, the possibility of gas invasion decreases, but there is an extreme value for the fracture height. The time of gas invasion does not change beyond this extreme value. When the fracture height is 100–700 mm, the time of gas invasion increases with the increase in the height; when the height is 700–900 mm, the gas invasion time does not change. These results provide a practical and effective method for enhancing oil recovery, preventing and treating gas invasion in gas–liquid flooding.

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“…where ρ m is the density of the drilling fluid, kg/m 3 ; v m is the drilling fluid velocity, m/s; γ is the gas content, dimensionless [29].…”

Section: Liquid-phase Control Equationmentioning

confidence: 99%

Section: Effect Of Fracture Widthmentioning

confidence: 99%

Study on Gas Invasion Behavior of Gas–Liquid Displacement in Fractured Reservoirs

et al. 2022

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“…In particular, the penetrant itself has a fixation effect, so as to orient the hydrophilic and lipophilic groups on the water surface and further reduce the surface tension. However, too low a surface tension in the drilling fluid filtrate can lead to foaming [25,26] . Therefore, a certain amount of defoamer must be added to maintain the stability of the drilling fluid [25] .…”

Section: Introductionmentioning

confidence: 99%

Research and Application of New Anti-CO2 Pollution and Low Damage Water-based Drilling Fluid

Bai,

Xie,

Cheng

et al. 2023

Preprint

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CO2 intrusion into the drilling fluid during bauxite drilling can cause hydration swelling and dispersion of clays and lead to massive foaming of them. Additionally, the formation develops micro-nano fractures, which also have a large difference in compressive strength and a high percentage of bound water. Once the foreign fluid invades, it will lead to wellbore destabilization and reservoir damage. Thus, the designed drilling fluid formulation does not contain solid phase particles such as bentonite. And we obtained the optimal proportion of hydrolocker, penetrant, and defoamer by Mixture Designs. Then the shielding plugging theory was introduced, and a temporary plugging gradation consisting of acid-soluble inert particles, deformable nano-sealers, and non-permeable sealers was constructed with the aid of BridgePro software. And other surfactants were optimized indoors to build a lowdamage, strong anti-CO 2 pollution water-based drilling fluid. It could resist the high temperature of 150℃ and has a remarkable ability to lower surface tension (17.3mN). The rolling recovery, the plugging rate, and permeability recovery value can reach more than 90%, the lubrication coefficient was around 0.125. The constructed drilling fluid completed 9 wells in field application, with an obvious reservoir protection effect and an average increase of more than 20% in single-well daily production compared to the expected daily production. It will be an important reference for future bauxite horizontal well drilling fluids to prevent CO2 contamination and reduce reservoir damage.

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Minimizing coalbed methane formation damage by biodegradable chelating agent flooding

Chen,

Shi,

Yang

et al. 2024

Sustainable Natural Gas Drilling

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Smart plugging and low-damage foam drilling fluid technology for CBM drilling

Cited by 3 publications

References 0 publications

Study on Gas Invasion Behavior of Gas–Liquid Displacement in Fractured Reservoirs

Study on Gas Invasion Behavior of Gas–Liquid Displacement in Fractured Reservoirs

Research and Application of New Anti-CO2 Pollution and Low Damage Water-based Drilling Fluid

Minimizing coalbed methane formation damage by biodegradable chelating agent flooding

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