Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Cao, Liyuan; Sun, Jinsheng; Zhang, Bo; Lu, Nu; Xu, Yuqiang

doi:10.3389/fphy.2022.1050229

Cited by 27 publications

(11 citation statements)

References 44 publications

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“…Some polymers undergo thermal decomposition at high reservoir temperatures, resulting in molecular chain breakage and loss of the original properties of the polymer. If ADS polymer microspheres undergo thermal decomposition, their plugging effect will be substantially weakened . Therefore, thermogravimetric analysis (TGA) is used to understand the thermal stability of ADS.…”

Section: Resultsmentioning

confidence: 99%

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Sun

li³

et al. 2023

Energy Fuels

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Most of the existing drilling fluid plugging agents fail in the high-temperature and high-mineralization environment of deep formations, and the drilling fluid will enter the deep part of the formation along microfractures and fractures, causing a series of downhole complications and accidents, which seriously affects the safety and efficiency of drilling and results in great economic losses. It is important to develop a high-temperature and high-mineralization-resistant plugging agent to effectively plug the formation for the development of deep oil and gas. In this paper, an adaptive plugging agent ADS is prepared by emulsion polymerization using 2-acrylamide-2-methylpropanesulfonic acid, N,N-dimethylacrylamide, and styrene as raw materials, which is resistant to high temperature and high mineralization in water-based drilling fluids, and is resistant to temperature up to 180 °C, sodium salt resistant to saturation, and calcium salt resistant to 5%. It has less influence on the rheology of the drilling fluid system.

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Section: Resultsmentioning

confidence: 99%

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Sun

li³

et al. 2023

Energy Fuels

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“…The displacement and load of any section x on the sucker rod string at time t can be obtained by solving eq with the finite difference method. − The polished rod load can be calculated by eq . P RL = A normalr E normalr ∂ u ∂ x | x = 0 where P RL is the polished rod load (N).…”

Section: Methodsmentioning

confidence: 99%

Intelligent Method to Optimize the Frequency Modulation for Beam Pumping System Based on Deep Reinforcement Learning

Zhang¹,

Chen

Xiao

2023

ACS Omega

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A mathematical simulation model of a beam pumping system with frequency conversion control is established, considering the influence of the real-time frequency variation on the motion law of a pumping unit, the longitudinal vibration of a sucker rod string, the crankshaft torque, and the motor power. On this basis, the key links such as state space, action space, and reward function are defined by using deep reinforcement learning theory, and an intelligent model to optimize the frequency modulation for a beam pumping system based on deep reinforcement learning is constructed. The simulation and field application results show that the frequency optimization model can significantly reduce the fluctuation amplitude of the polished rod load, crankshaft torque, motor power, and input power of the system, making the operation of the pumping system more stable and energy-saving. More importantly, the model can realize the independent learning and control of the corresponding parameters without manual intervention to ensure the normal operation of the system and improve the level of information and intelligent management of oil wells.

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“…The efficient development of shale oil and gas has changed the global energy pattern. − Reducing the drilling cost of shale gas is a critical factor in decreasing the cost and increasing development efficiency. However, shale has a high clay mineral content and requires a long horizontal well.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Mechanism and Effect of Citric Acid-Based Deep Eutectic Solvents Inhibiting Hydration and Expansion of Gas Shale Clay Minerals

et al. 2023

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This study developed a shale hydration inhibitor using a citric acid-based deep eutectic solvent (Cit-DES) and hexadecylammonium bromide (cetyltrimethylammonium bromide) to aid wellbore instability and collapse caused by drilling of shale gas wells with water-based drilling fluids. Soaking and linear expansion experiments were conducted with Na-bent and Longmaxi formation shale, respectively. The changes in illite interlayer spacing, wettability, and water absorption capacity of shale samples before and after soaking in an inhibitor solution were evaluated, which indicated that the inhibitor reduced shale hydration. The results showed that the inhibitor effectively inhibits the osmotic and surface hydration of the shale. Due to the Cit-DES hydrogen bond, the inhibitor is firmly adsorbed on the shale pore wall and inserted between clay minerals, reducing the shale surface energy, hydrophilicity, and surface potential. The swelling expansion rate of shale inhibitors is only 38.9% compared to a 3% KCl solution. The amount of shale imbibition per unit mass in distilled water is 0.011 g/g. In the inhibitor, the imbibition mass per unit of shale is 0.002 g/g, which is only 23.68% of that in distilled water. The inhibitor is environment-friendly and has a broad application prospect for maintaining shale wellbore stability and preventing wellbore collapse during horizontal shale drilling operations.

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Sensitivity analysis of the temperature profile changing law in the production string of a high-pressure high-temperature gas well considering the coupling relation among the gas flow friction, gas properties, temperature, and pressure

Cited by 27 publications

References 44 publications

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Development of High-Temperature and High-Mineralization-Resistant Adaptive Plugging Agent and Its Performance Evaluation

Intelligent Method to Optimize the Frequency Modulation for Beam Pumping System Based on Deep Reinforcement Learning

Investigation of the Mechanism and Effect of Citric Acid-Based Deep Eutectic Solvents Inhibiting Hydration and Expansion of Gas Shale Clay Minerals

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