Water coning in gas production wells generally causes excess water production and many operational problems. This phenomenon is more crucial in fractured reservoirs. The purpose of this study is to investigate this phenomenon by numerical simulation of gas production in a three-dimensional single well model. In order to obtain accurate perception of actual flow behavior, the structure of fracture network

Pore evolution in organic-rich shale is widely reported to be related to thermodynamic reactions, but its connection with tectonic deformation is overlooked. A systematic comparative analysis was conducted in the Changning area to detect the tectonic deformation of organic-rich shale. The study encompassed mineralogical composition, petrography, and porosity, along with the state of tectonic stress

The current study offers a practical guide for dealing with water influx and liquid loading problems particular to gas wells. Methods and discussions on remedying these problems are supported by real field cases (eight gas wells from Thrace Basin, Turkey) and are extended to wells targeting unconventional resources (coalbed methane, methane hydrates, shale gas). Indications of liquid loading are discussed

Perforation is the key to the successful implementation of hydraulic fracturing. The research on perforation mechanism is of great significance to perforation planning, completion design, hydraulic fracturing design, and proppant migration analysis. In this paper, a finite element model for simulating crack initiation and propagation in the presence of multiple perforations is established based on

In this study, the combustion pressure of pure methane-air mixture, with 99.99% purity, and a mixture of air with Natural Gas (NG) consisted of 84.2% Methane, 9.5% Ethane, and 3.7% Propane was investigated, while both mixtures had an initial pressure of 10 bar. In this study, the combined effect of initial turbulence, pressure, and ignition energy on the combustion characteristics of each mixture was

Oil field management is gaining significant importance with CO2 injection. The application of a completion strategy and utilization of appropriate downhole equipment is a vital aspect of a prolific producing well. In recent applications, another aspect that has been gaining attention is an intelligent completion system. This study investigates the details of oil recovery utilizing horizontal wells

The exploitation of unconventional formations requires propped hydraulic fracturing treatments. Propped fracturing is an expensive process that usually suffers from operational challenges. In this study, a new technology is proposed which targets implementing thermochemical fluids to stimulate unconventional formations. These fluids release large pressure pulses upon a reaction that creates networks

HiWay flow channel fracturing, as a paradigm shift in the conventional hydraulic fracturing, was introduced by Schlumberger in 2010. The improvement of the new technology compared to conventional fracturing methods is presented by the scattered multi-layer proppants which concentrate loose proppants into fibered pillars in order to provide broader flow pathways in fractures. Although numerous experimental

Hydrates have been identified as potential technologies for applications such as storage and transportation of natural gas and seawater desalination. These industrial applications are usually affected by the induction time and the growth rate of the hydrate. The addition of surfactants to the gas–water system can improve this effect. The formation of natural gas hydrate requires a lot of water, and

Acid fracturing also referred to as fracture acidising, is an application of hydraulic fracturing in which fluid is mixed with an acid. Recently, special attention has been paid to carbonaceous shale reservoirs as new unconventional energy resources. In this study, geochemical and hydraulic behaviour of the fracture acidising was investigated through numerical simulations. A geochemical model was constructed

The process of stable gas condensate zeoforming was implemented at the laboratory scale under the conditions of varying feedstock composition and technological parameters (temperature, pressure, feedstock flow rate). The directions of hydrocarbon transformations were established. The influence of technological parameters on the composition and properties of the obtained product was estimated. From

Hydraulic fracturing with proppants is the key technology in developing coalbed methane (CBM) reservoirs. However, coal fine retention in the fracturing proppant will directly affect its permeability and drop the CBM production. In this paper, coal fine retention experiments in fracturing proppants not containing coal fines, along with permeability tests of fracturing proppants containing coal fines

Flare gas emission is a critical issue in the oil and gas industry due to its significant environmental impacts. While there are currently available solutions that can minimize the environmental risks of such emission sources, the implementation of these technologies generally brings additional economic and environmental challenges. Among the available technologies, the liquid ring compressor (LRC)

Viscous slickwater have been successfully applied as an alternative to conventional ones. However, it is still not clear whether these two types of slickwater show the same friction-reduction characteristics when migrated into pipelines and fractures. In this study, the friction-reduction performances of a conventional friction reducer (FR-800) and a highly viscous friction reducer (HVFR-900) in pipelines

The deep formations (underlying strata of the 3rd Member of Quantou Formation, Upper Cretaceous) in Songliao Basin possess a large natural gas potential, with a proven reserve of more than 200×109m3 (706.3bcf). However, due to deep burial depth, multiple tectonic evolutions, and sets of source rocks, complex gas accumulations and different gas reservoir types developed, which may seriously restrict

The permeability measurement of marine natural sediments is helpful to evaluate the characteristics of seawater immersion in the sediment layer and the difficulty of upward escape of gas below the sediments. In this work, the stress on the natural sediments in the Shenhu Area of the South China Sea with different buried depths was simulated by confining pressure. The effective gas permeability of natural

The organic-rich shales deposited in marine-continental transitional environments are well developed in China. Previous studies mainly focused on the petrology and geochemical characteristics of the transitional shale. However, the factor controlling organic matter (OM) enrichment in the shale has not been studied adequately, limiting the optimal reservoir selection in shale gas exploration. Based

Shale hydration and dispersion leading to wellbore instability is always a challenge in oil and gas drilling engineering. In this study, specifically designed nano-particles by grafting hyperbranched polyethyleneimine (Mw=600) onto the surface of nano-silica particles were synthesized. The modified nano-particles were characterized with Fourier transform infrared spectrum (FT-IR), particles size distribution

Drilling optimization can have direct and indirect cost savings implications on drilling a well. As a result, over the years, attention has been given to developing analytical and data-driven models that effectively predict and optimize the rate of penetration (ROP). This paper focuses on another aspect of improving drilling performance - predicting and optimizing torque-on-bit (TOB). TOB is a critical

Wettability alteration analysis form gas-repellent to gas-wet with the aid of chemical agents has been subjected of numerous studies. However, fundamental understanding of the effect of surface tension of liquid on repellency strength, the change in the intermolecular forces due to the adsorption of nanoparticles onto the rock surfaces, and treated rock exposure in brine are not well discussed in the

The development of tight gas reservoirs within the Ordos basin is closely related to the tectonic evolution. In this study, homogenization temperature of aqueous inclusions and the burial and thermal history of single well were combined to determine the tight gas charging time in the Permian Lower Shihezi sandstones in the Hangjinqi area, northern Ordos Basin. The paleo-structural characteristics and

The stimulation of hydraulic fracturing on a combination of depressurization with thermal stimulation for natural gas hydrate (NGH) exploitation from challenging ocean hydrate reservoirs is investigated in this study. The influence of fracture permeability, well spacing on hydrate exploitation, and the enhancement effect of hydraulic fracturing on different well spacing are numerically investigated

The pressurized CO2 pipeline is a necessary component of Carbon Capture and Storage (CCS) infrastructures. However, the potential risk caused by CO2 pipeline is still not very clear. Especially the scientific community is focusing on the understanding of multi-phase (gas-liquid-solid) flow of CO2 jet in the near-field of dispersion. In this paper, a compressible multi-phase Computational Fluid Dynamics

The formation sands of natural gas hydrate (NGH) reservoirs in the South China Sea are fine silty sands with a high content of clay, and it is difficult to be controlled effectively. We carried out a series of experiments to investigate the microcosmic retaining and plugging behavior of screen media with highly argillaceous fine sand samples, with median size of 10.13μm. The screen sand-retention media

Natural gas processing unit consume a high amount of energy. Any attempt to achieve lower energy consumption subjected to evaluation criteria would lead to a remarkable enhancement in the process efficiency. In the present study, an optimization was carried out by minimizing the specific energy consumption [kWh/kg of Sales Gas - SG] including the restriction of a minimum limit of 90% C3+ recovery by

With Managed Pressure Drilling (MPD) becoming increasingly important to oil and gas well construction, there has been a growing demand for comprehensive models that can accurately describe the well hydraulic dynamics, especially for complex well geometries, High-Pressure High-Temperature (HPHT) conditions, during well control events, etc. To meet this demand, new multi-phase hydraulic models have been

Computed tomography (CT) is a useful sample characterization and analysis technique to better understand complicated reactive transport processes in geologic CO2 utilization and storage (GCUS) conditions. According to previous studies, we have identified four major challenges that hinder the application of CT scanning in GCUS-related sample characterization: (1) lack of registration, segmentation,

Reliable estimations of the relative permeability of gas and water in hydrate-bearing sediments (HBS) and the dependency of the relative permeability on hydrate saturation are critical to predict the productivity of a hydrate reservoir. Yet, this remains poorly estimated owing to lack of experimental data associated with difficulties in conducting multiphase flow experiments in HBS. Recognizing the

Accurate delineation of hydrocarbon seepage has significant implications in accentuating hydrocarbon migration pathways and assessing seal integrity thereby alleviating drilling hazards. Knowledge of migration pathways and understanding about the source/reservoir plays a vital role in successful evaluation of hydrocarbon seepage. Many researchers have reported events of gas leakage in Poseidon area;

The delivery of natural gas to consumers requires significant infrastructure that consists of numerous technical units and other gas transmission assets. The failure of a single component in a gas transmission and distribution network might compromise the reliability of the gas supply system. Thus, the proper location of facilities for employees and contractors performing inspections and maintenance

Supersonic gas separator is proposed for methane purification. One-dimensional analysis is performed to examine the design aspects associated with the converging-diverging nozzle and the liquid separation chamber. The results indicate that at low swirl intensities, the separation chamber length is about 100 times of the nozzle throat. Increasing the swirl intensity would lower this length sharply and

This paper proposes a novel integrated system for hydrogen and natural gas blending system for a selected residential application. In the current system, hydrogen is generated via an alkaline water electrolyzer unit, and the electricity required for the electrolyzer is supplied from renewable sources, i.e., solar PV panels and wind turbines. The remaining electricity is supplied to the building where

The presence of water in coal matrices could cause capillary force and consequently affect gas production. In this work, an integrated experimental and numerical modelling approach was adopted to quantify the impact of capillary trapping on coal seam gas (CSG) recovery. The experimental work was to gain the change rule of contact angle with pressure. The experimental data was then fed into a fully

Organic-rich gas shales are often composed of thin laminated structures and, thus, may be considered as transversely isotropic material. The shale's anisotropic properties are affected by many factors, including confining pressure, water content, total organic content (TOC), etc. In this work, ultrasonic velocity measurements were performed at various confining pressures and water content conditions

Hydraulic fracturing creates a complex fracture geometry in heterogeneous formations which are frequently simulated using Finite Element based fracture propagation modelling tools. Representing this geometry in Finite Difference based multiphase flow simulators poses some challenges. In this study, a Fracture Upscaling Method (FUM) is developed to represent complex fracture systems generated by the

This research presents a hybrid model to predict oil production and to provide a dynamic risk profile of the production system. The introduced predictive approach combines a multilayer perceptron (MLP)-artificial neural network (ANN) model with a hybrid connectionist strategy (BN-DBN), which comprises a Bayesian network (BN) model and a dynamic Bayesian network (DBN) model. The proposed hybrid methodology

For the safe exploration of natural gas hydrate, an understanding of the mechanical behaviors of methane hydrate-bearing sediments is essential. To date, the majority of the related research has focused on the mechanical properties of sandy sediments; research on fine sediments containing clay or silt is very limited, although more than 90% of gas hydrates are found in clay or silt. In this study,

The utilization of liquid CO2 for enhanced coalbed methane recovery has great environmental and commercial potential to sink greenhouse gas emissions and enchance CH4 extraction. A comprehensive understanding of mechanical properties and micro-scale changes to coal saturated with liquid CO2 would fill the knowledge gap regarding CO2 utilization and be greatly beneficial to industry. The present study

In drilling fluid industry, few shale inhibitors commonly used can simultaneously meet the requirements of strong inhibition and environmental performance. In our previous study, polyamino acid materials showed great potential to be used as environmental-friendly and efficient shale inhibitors. Herein, four polyamino acids with different functional groups, polyglycine (PGly), polyglutamic acid (PGlu)

The movable-water saturation (MWS) of coal is critical for the flow of coalbed methane (CBM), however, there is a relative lack of research on it, especially of different-scale pores. The relative permeability of coal is another crucial parameter for CBM development due to its strong control on the characteristics of both gas and water production, but it also remains relatively unexplored. Naturally

Although the cohesive element method has been widely used for modeling hydraulic fracturing, the hardening properties of shear strength and shear fracture energy of rock matrix and natural fracture with the increasing of confining pressure have not been applied to the constitutive law of cohesive element for a long time. In this study, a shear hardening model and the corresponding user subroutine USDFLD

The current scheme for developing shale reservoirs necessitates special considerations while estimating the reserve. While reservoir characteristics lead to an extended infinite acting flow regime, completion schemes could result in a series of linear flows. Therefore, the initial linear flow does not have to be followed by a boundary-dominated flow. Overlooking this observation leads to unphysical

The deep-towed Autonomous Cable Seismic (ACS) system is a high-resolution acoustic survey system designed for use in deep-water environments. This system uses a high-frequency acoustic source and a multichannel receiver cable. A common problem in the analysis of deep-towed ACS data is the unstable positioning of the source and receivers due to ocean currents and seafloor bathymetry. Since the data

The frequent changes in the composition of acid gas feed to the Claus process cause flame instability and lead to the incomplete destruction of aromatic contaminants in feed that are benzene, toluene, ethylbenzene, and xylenes (BTEX). These aromatics cause frequent catalyst deactivation. The current literature lacks a reliable global kinetic model that can ease the computational burden of optimizing

It is well-known that petroleum fluid properties (also known as Pressure-Temperature-Volume -PVT) is needed for many petroleum engineering and other interdisciplinary engineering applications. Especially in recent years, multi-disciplinary acquisition of such data and its use became more and more important as seamless and efficient integration became a necessity. Fluid properties for every step of

In this study, three equations of state (EOS) in conjunction with computational fluid dynamics (CFD) modeling were used to predict the Joule – Thomson (JT) process behavior for natural gas and various pure gases. The JT effect is encountered in several industrial applications. The experimental determination of the JT coefficient (JTC) is complicated, and there is little gas pressure-volume-temperature

Gas hydrates can readily form in deep-water oil and gas production processes and can lead to disruptions in flow conditions. In this work, in order to investigate the interdependence of hydrate formation and multiphase flow characteristics, a transparent rock-flow cell was used where a series of hydrate formation and flow experiments were conducted under different rocking conditions, which corresponded

Accurate characterization of permeability behavior in hydrate-bearing sediments (HBS) is crucial for sustainable gas production. During gas exaction from HBS, permeability is strongly affected by the geomechanical conditions, which change pore structure of HBS. Moreover, hydrate dissociation will also change pore structure and geomechanical behavior of HBS. Therefore, the predictive modeling of permeability

Discrimination of fluid properties in tight fractured reservoirs plays a significant role in seismic reservoir characterization for a fracture-induced horizontal transversely isotropic (HTI) medium. From a perspective of low-frequency anisotropic Gassmann's theory, we propose a new anisotropic fluid indicator coupling an isotropic fluid/porosity term and a dry term of normal fracture weakness by the

A clear understanding of the hydrate pore habits and seepage characteristics of hydrate bearing sediments (HBSs) has great theoretical and practical value for natural gas hydrate (NGH) exploitation. Micro CT allows direct inspection of gas hydrate growth behaviors in pores and detailed pore structure of HBS for use in numerical models. Moreover, in situ analyses of hydrate bearing cores can also be

Microfractures in the coal reservoir contribute greatly to the exploitation of coalbed methane. In this study, the 3D microfracture structure of low-volatility bituminous coal is characterized by using nano-computed tomography (nano-CT), and the seepage characteristic of the single-phase water flow in the microfracture network is simulated by Avizo and Comsol. The result shows that the low-volatility

Natural gas (methane) hydrates have great potential as fuels. It is necessary to study the flame characteristics to evaluate its energy efficiency when directly burned as a fuel and the risk of storing and transporting natural gas as the form of hydrate. Here, the flame characteristics in the combustion of methane hydrate spheres under natural convective flow conditions were investigated. Physical

In the quest for net-zero greenhouse gas emission, CO2 capture and storage technologies play a prominent role. Estimates suggest a potential of sequestering up to several thousand metric gigatons of CO2. However, some of the main challenges in its development are an assessment of reservoir-specific storage capacities due to variabilities and heterogeneities in the underlying properties (structure,