Summary Many shale gas reservoirs have been previously thought of as source rocks, but the industry now finds these rocks still contain large volumes natural and liquids that can be produced by use horizontal drilling hydraulic fracturing. However, one most uncertain aspects development is our ability to accurately forecast resources economics. The uncertainty problem begs for a probabilistic solution. objective work was develop data sets, methodology, tools determine values original in...

Abstract In the process of developing tight oil and gas reservoirs, multistage fractured horizontal wells (NFHWs) can greatly increase production rate, optimal design its fracturing parameters is also an important means to further rate. Accurate prediction essential for formulation effective development strategies plans before during project execution. this study, a novel workflow incorporating machine learning (ML) particle swarm optimization algorithms (PSO) proposed predict rate...

Summary Most estimates of the resource endowment [original gas in place (OGIP)] reported for world unconventional start with Rogner's top-down study (Rogner 1997). That global estimate is most likely quite conservative because oil and industry has discovered enormous volumes shale around since 1990s. The data from these new reservoirs add substantially to our understanding base. Furthermore, uncertainty assessment was not quantified. Thus, considering uncertainty, a original worldwide...

Abstract Carbon dioxide has been used commercially to recover oil from reservoirs for more than 40 years. Currently, CO2 flooding is the second most applied enhanced recovery (EOR) process in world behind steam flooding. Water alternating gas (WAG) injection a popular method control mobility and improve volumetric sweep efficiency Average EOR about 9.7% with range between 6 20% miscible WAG injection. Despite all success of injection, during typical challenge reach higher recovery. We...

Well-logging is an important formation characterization and resource evaluation method in oil gas exploration development. However, there has been a shortage of well-logging data because can only be measured by expensive time-consuming field tests. In this study, we aimed to find effective machine learning techniques for prediction, considering the temporal spatial characteristics data. To achieve goal, convolutional neural network (CNN) long short-term memory (LSTM) networks were combined...

Abstract Polymer flooding has proved an effective technique to improve development efficiency in heterogeneous reservoirs. Previously, operators usually employed continuous injection of large polymer slugs. However, problems existed including premature profile reversal during development, ineffective circulation solution low-permeability zones, and excessive consumption the late stage. The paper proposed a combination method, named as polymer-alternating-water (PAW), solve issues traditional...

Reservoir lithology identification is the basis for exploration and development of complex lithological reservoirs. Efficient processing well-logging data key to identification. However, reservoir through still a challenge with conventional machine learning methods, such as Convolutional Neural Networks (CNN), Long Short-term Memory (LSTM). To address this issue, fully connected network (FCN) LSTM were coupled predicting lithology. The proposed algorithm (LSTM-FCN) composed two sections. One...

The dynagraph card plays a crucial role in evaluating oilfield pumping systems’ performance. Nevertheless, classifying cards can be quite difficult because certain operating conditions may exhibit similar patterns. Conventional classification approaches mainly involve labor-intensive manual analysis of these cards, leading to subjectivity, prolonged processing times, and vulnerability human prejudices. In response this challenge, our study introduces novel approach that leverages transfer...

CO2 is one of the main methods for improving recovery. The low viscosity and density lead to issues such as viscous fingering gravitational override during displacement process, which can cause gas channeling premature breakthrough in reservoirs. These problems severely affect sweep efficiencies, thereby reducing recovery flooding. Addressing challenge increasing mitigate these crucial flooding technology. This study conducts a feasibility analysis on use polymers enhance through molecular...

The oil recovery factor from shale remains low, about 5 to 7% of the in place. How increase reservoirs is attracting more and attention. CO2 huff-and-puff was historically considered one best approaches improve rate. Most previous simulation studies have been based on dual porosity, but results dual-porosity models not as accurate discrete fracture composition modeling. This study proposes a new model that integrates embedded dual-porosity, dual-permeability (DPDP). newly developed method...

The couple flow deformation behavior in porous media has drawn tremendous attention various scientific and engineering fields. However, though the coupled mechanism been intensively investigated last decades, essential controls on stress sensitivity are not determined. It is of practical significance to use analytic methods study media. Unfortunately, because disordered extremely complicated microstructures media, theoretical model for scarce. goal this work establish a novel reasonable...

Oil production from tight oil reservoirs has become economically feasible because of the combination horizontal drilling and multistage hydraulic fracturing. Optimal fracture design plays a critical role in successful economical reservoir. However, many complex parameters such as spacing half-length make fracturing treatments costly uncertain. To improve design, it is essential to determine reasonable ranges for these evaluate their effects on well performance economic feasibility. In...

Abstract Many shales previously thought of as only source rocks are now recognized self-sourcing reservoirs that contain large volumes natural gas and liquid hydrocarbons can be produced using horizontal drilling hydraulic fracturing. However, shale resources development economics uncertain, these uncertainties beg for a probabilistic solution. Our objective was to probabilistically determine the distribution technically recoverable (TRR) original in place (OGIP) highly uncertain risky seven...

The coupled flow deformation behavior in the porous media has drawn tremendous attention various scientific and engineering fields. It is reported that will be compressed relative permeability changed as effective stress increases. However, previous studies provided contradictory evidence for stress-dependent irreducible water saturation permeability. Until now, appropriate curve two-phase through remains unclear. goal of this work was to theoretically experimentally study Laboratory sample...

Reinjecting produced methane offers cost-efficiency and environmental benefits for enhances oil recovery. High minimum miscibility pressure (MMP) in methane-oil systems poses a challenge. To overcome this, researchers are increasingly focusing on using surfactants to reduce MMP, thus enhancing the effectiveness of injections This study investigated impact temperature equilibrium interfacial tension CH4+n-decane system molecular dynamics simulations vanishing technique. The primary goal was...

Abstract In consideration of the difficulty to setup conventional steam generator on offshore production platform, a compact and flue gas is developed thermally stimulate heavy oil reservoir, which consists water treatment injection unit, fuel air metering controlling unit. The temperature generated usually 200-350°C with 13.1-28.3wt% gas, pressure could be up 20MPa, rate 80-270 m3/day. past two years, cyclic steam-flue co-injection are applied 8 horizontal wells completed or non-thermally...

Shale gas reservoirs can be divided into three regions, including hydraulic fracture stimulating reservoir volume regions (SRV regions), and outer (OSRV regions). Due to the impact of fracturing, induced fractures in SRV are often irregular. In addition, a precise description secondary is critical importance for production analysis prediction. this work, following work achieved: (1) complex network region described with fractal theory; (2) dual inter-porosity flow mechanism sorption...

Abstract Many shale gas reservoirs have been previously thought of as source rocks, but the industry now finds these rocks still contain large volumes natural and liquids that can be produced using horizontal drilling hydraulic fracturing. However, one most uncertain aspects development is our ability to accurately forecast resources economics. The uncertainty problem begs for a probabilistic solution. objective work was develop data sets, methodology tools determine values original in place...

CO2 has been used to recover oil for more than 40 years. Currently, about 43% of EOR production in U.S. is from flooding. flooding a well-established technique, but its density and viscosity nature are challenges projects. Low (0.5 0.8 g/cm3) causes gas rise upward reservoirs bypass many lower portions the reservoir. (0.02 0.08 cp) leads poor volumetric sweep efficiency. So water-alternating-gas (WAG) method was control mobility improve However, WAG process some other problems heavy...

Fractured reservoirs are distributed widely over the world, and describing fluid flow in fractures is an important challenging topic research. Discrete fracture modeling (DFM) equivalent continuum two principal methods used to model through fractured rocks. In this paper, a novel method, embedded discrete (EDFM), developed compute permeability reservoirs. This paper begins with introduction on EDFM. Then, describes upscaling procedure calculate permeability. Following this, carries out...