Yihua Dou
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View article: Tubing String Dynamics During Transient Start-Up and Shutdown in CO2 Flooding
Tubing String Dynamics During Transient Start-Up and Shutdown in CO2 Flooding Open
In CO2 flooding technology, the injection tubing string is prone to intense fluid–structure interaction (FSI) vibrations and water hammer effects during transient start-up and shutdown processes, which seriously threaten injection safety. …
View article: Softening of Production Tubing Under Random Vibration Excitation and Prediction of Fatigue Life of the Entire Wellbore
Softening of Production Tubing Under Random Vibration Excitation and Prediction of Fatigue Life of the Entire Wellbore Open
A study was conducted on the mechanical behavi or of the completion string in a 10,000 m ultra-deep well from western China’s oilfields to identify the causes of plastic failure in the string. This article analyzes the interaction between …
View article: Analysis of Energy Dissipation and Sealing Performance of the Premium Connection in Modal Vibrations
Analysis of Energy Dissipation and Sealing Performance of the Premium Connection in Modal Vibrations Open
Traditional static analysis cannot effectively explain the issue of the sealing performance of the premium connection being decreased due to the vibration of the tubing, leading to the failure of the connection sealing. In this paper, base…
View article: Experimental Study on Mechanical Properties of Rock in Water-Sensitive Oil and Gas Reservoirs Under High Confining Pressure
Experimental Study on Mechanical Properties of Rock in Water-Sensitive Oil and Gas Reservoirs Under High Confining Pressure Open
Injecting high-pressure fluid into a reservoir rock mass will change the mechanical properties of the rock; the strength and safety of a shale well wall are also extremely critical. In order to investigate the law of variation in water-sen…
View article: Research on Sealing Premium Connections in Corrosive CO2 Environments
Research on Sealing Premium Connections in Corrosive CO2 Environments Open
To investigate corrosion and resulting changes in the sealing performance of premium connections in corrosive CO2 environments, we carried out a simulation analysis of their secondary current distribution and structural mechanics based on …
View article: Parameter Identification and Energy Dissipation Analysis of Premium Connections Based on the Iwan Model
Parameter Identification and Energy Dissipation Analysis of Premium Connections Based on the Iwan Model Open
The premium connection is an important section of the tubing column. Under intricate downhole conditions, axial vibration generates alternating loads that cause energy dissipation between the sealing surfaces of the premium connection, red…
View article: Establishment and application of temperature–pressure coupling model for opening and closing wells in HTHP gas wells
Establishment and application of temperature–pressure coupling model for opening and closing wells in HTHP gas wells Open
Switching wells in high-temperature and high-pressure gas wells will affect parameters such as the temperature and pressure of the fluid in the wellbore. Dynamic monitoring of temperature and pressure is difficult, and wellbore temperature…
View article: Numerical simulations of sand‐screen performance in unconsolidated prepacked gravel screen
Numerical simulations of sand‐screen performance in unconsolidated prepacked gravel screen Open
This work addresses the ongoing challenge of optimizing sand control screens, attributed to a limited understanding of screen blocking. A novel one‐way computational fluid dynamics and discrete element method (CFD–DEM) coupling technique i…
View article: Linear Time Non-Local Cost Aggregation on Complementary Spatial Tree Structures
Linear Time Non-Local Cost Aggregation on Complementary Spatial Tree Structures Open
Studies on many dense correspondence tasks in the field of computer vision attempt to find spatially smooth results. A typical way to solve these problems is by smoothing the matching costs using edge-preserving filters. However, local fil…
View article: Research progress on the calculation model of critical liquid carrying flow of gas well
Research progress on the calculation model of critical liquid carrying flow of gas well Open
The accumulation of liquid in gas wells has become a prevalent problem in the middle and later stages of gas well development with different wellbore structures, which seriously affects the production efficiency of gas wells. To precisely …
View article: Research on Downhole Throttling Characteristics of Gas Wells Based on Multi-Field and Multi-Phase
Research on Downhole Throttling Characteristics of Gas Wells Based on Multi-Field and Multi-Phase Open
The formation of natural gas hydrates seriously affects the production efficiency of gas wells. Obtaining the correct temperature and pressure profile along the wellbore of gas wells is a prerequisite for accurately predicting the location…
View article: Effect of Ion Size on Pressure-Induced Infiltration of a Zeolite-Based Nanofluidic System
Effect of Ion Size on Pressure-Induced Infiltration of a Zeolite-Based Nanofluidic System Open
A nanofluidic system consists of a nano-porous medium and functional liquid, which demonstrates a higher energy absorption density compared to conventional systems for energy absorption. Alterations in the composition of the functional liq…
View article: Study of Temperature Effect on Cascade Characteristics of Nanofluidic Energy Absorption System
Study of Temperature Effect on Cascade Characteristics of Nanofluidic Energy Absorption System Open
Nanofluidic energy absorption system (NEAS) with cascade energy absorption characteristics can absorb energy on different levels simultaneously in one system, which greatly enriches its functions and applications. The pore structure and si…
View article: The Influence of Layer Stacking Method on the Mechanical Properties of Honeycomb Skeleton
The Influence of Layer Stacking Method on the Mechanical Properties of Honeycomb Skeleton Open
The performance of a multi-layer honeycomb skeleton can be significantly enhanced through tandem connection, while the structure’s properties can be tailored by altering the layer stacking method of the honeycomb skeleton. To investigate t…
View article: Experimental Study on the Effects of Applied Electric Field on Liquid Infiltration into Hydrophobic Zeolite
Experimental Study on the Effects of Applied Electric Field on Liquid Infiltration into Hydrophobic Zeolite Open
A nanofluidic energy absorption system (NEAS) is composed of nanoporous material and functional liquid with high energy absorption density. Applying an electric field to adjust the energy absorption characteristics of a nanofluidic system …
View article: Finite-Element Analysis on Energy Dissipation and Sealability of Premium Connections under Dynamic Loads
Finite-Element Analysis on Energy Dissipation and Sealability of Premium Connections under Dynamic Loads Open
In the process of high flow rate fracture and high gas production, the sealing performance of the premium connection decreases due to the dynamic load and vibration of downhole tubing strings, which may cause accidents. Existing static ana…
View article: Structural Design and Sealing Performance Analysis of a Nanofluidic Self-Heating Unsealing Rubber Cylinder
Structural Design and Sealing Performance Analysis of a Nanofluidic Self-Heating Unsealing Rubber Cylinder Open
As a crucial component for temporary blocking of layer segments in the segmental fracturing process, bridge plugs are difficult to unseal by conventional methods and may cause major downhole accidents if not handled properly. In this paper…
View article: Sealability Analyses of Premium Connections Characterized by a Surface Fractal Function
Sealability Analyses of Premium Connections Characterized by a Surface Fractal Function Open
With the development of high-pressure, high-temperature wells, the sealability of premium connections is being threatened by heavy loads. For the sake of researching the sealability of premium connections at the microlevel on the sealing s…
View article: The simulation analysis of sealing performance of cone-cone premium tubing connection under combined loads
The simulation analysis of sealing performance of cone-cone premium tubing connection under combined loads Open
Under the complex downhole loads, premium tubing connections often suffer from seal failure and threaded connection failure, leading to tubing string leakage and even safety accidents. Therefore, this paper focuses on the cone-cone premium…
View article: Strength Failure of CO2 Injection Tubular Strings Considering CO2 Phase Transition
Strength Failure of CO2 Injection Tubular Strings Considering CO2 Phase Transition Open
Compared with traditional injection tubular strings, the stresses on CO2 injection tubular strings are more complex. The results from field applications show that the phase transition of CO2 fluid in CO2 injection strings is an important f…
View article: Analysis of Energy Dissipation on the Sealing Surface of Premium Connection Based on a Microslip Shear Layer Model
Analysis of Energy Dissipation on the Sealing Surface of Premium Connection Based on a Microslip Shear Layer Model Open
In high production gas wells, premium connections are subject to alternating loads and vibration excitation due to the change of fluid pressure exerted on the tubing string. The energy dissipation on the sealing surface of premium connecti…
View article: Application Characteristics of Zeolite-Based Stuffing for Nanofluidic Packer Rubber
Application Characteristics of Zeolite-Based Stuffing for Nanofluidic Packer Rubber Open
Aiming at obtaining the application characteristics of more nanofluidic stuffing to enrich the database of nanofluidic packer rubber, three zeolite-based nanofluidic types of stuffing with water, glycerin, and a saturated aqueous solution …
View article: Design and Performance Analysis of Toothless Slip Type Magnetic Rotary Oil Well Pipe Tong
Design and Performance Analysis of Toothless Slip Type Magnetic Rotary Oil Well Pipe Tong Open
Although the current hydraulic power pipe tong can improve efficiency and reduce strength, there are still some deficiencies. Among them, the inevitable defects are a low degree of automation, high labor intensity, complex mechanical mecha…
View article: Study on Downhole Throttling Characteristics of High Water Content Gas
Study on Downhole Throttling Characteristics of High Water Content Gas Open
In order not to hinder gas production, we usually hope that the bottom hole effusion can be discharged to the surface with high-pressure natural gas. For the production data of high water content gas wells, the problems of insufficient wat…
View article: Investigation and application of wellbore temperature and pressure field coupling with gas–liquid two-phase flowing
Investigation and application of wellbore temperature and pressure field coupling with gas–liquid two-phase flowing Open
With the development of gas well exploitation, the calculation of wellbore with single-phase state affected by single factor cannot meet the actual needs of engineering. We need to consider the simulation calculation of complex wellbore en…
View article: Sensitivity analysis of coiled tubing erosion wear based on FLUENT
Sensitivity analysis of coiled tubing erosion wear based on FLUENT Open
Erosion wear is the main reason for the failure of coiled tubing during hydraulic jet fracturing operations. Taking Φ 60.325mm × 4.775mm CT90 coiled tubing as the research object. Three-dimensional finite element model of coiled tubing is …
View article: Analysis of the running capacity of coiled tubing in three-dimensional curved borehole
Analysis of the running capacity of coiled tubing in three-dimensional curved borehole Open
When coiled tubing enters three-dimensional borehole, elastic deformation is very easy to occur, leading to the decrease of running depth. In order to study the running capacity of coiled tubing, the running friction of coiled tubing under…