Superabsorbent polymer particles, also called preformed particle gels (PPGs), have been successfully applied to reduce water production and enhance oil in mature reservoirs with fractures or super-high-permeability streaks/channels. The particles usually range size from a few hundred micrometers millimeters are irregular shape, which make it impossible measure their rheology behavior using traditional rheometer. A simple method, screen model test, was designed evaluate the rheological of...

The East Eifel Volcanic Field (EEVF) in western Germany comprises numerous scoria cones, maars, and lava domes, with recent geodetic measurements revealing uplift rates of up to ~2 mm/yr. Deep low-frequency earthquakes indicate ongoing magmatic processes transcrustal melt pathways. To refine the understanding geometry volume potential structure, we present a 3D gravity magnetic inversion uppermost crust beneath EEVF.Initially, synthetic forward modeling evaluated detectability magma bodies...

During the underbalanced pressure drilling, conical rubber core of rotary blowout preventer((RBOP) is susceptible to alternating cyclic stress due passage drill pipe body and its joint, which can easily lead fatigue cracking sealing failure. To improve performance core, constitutive parameters were obtained by fitting uniaxial tension compression test results with Yeoh model. Subsequently, finite element model dynamic was established simulate law contact surface between pipe. It be concluded...

ABSTRACT Drainage divide migration shapes landscape, sediment patterns, and biodiversity, which is affected by a variety of factors. While geomorphic index numerical simulations have been employed to investigate migration, previous studies ignore the present‐day vertical velocity field. The Eastern Qinling characterised differential tectonic uplift dense river systems. This study examines analysing levelling observation with topographic swath. We used χ ‐map channel longitudinal profiles...

The efficient extraction of natural gas from marine hydrate (NGH) reservoirs is challenging, due to their low permeability, high saturation, and fine-grained sediments. Hydraulic fracturing has been proven be a promising technique for improving the permeability these unconventional reservoirs. This study presents comprehensive triaxial experimental investigation behavior fracture initiation mechanisms NGH-bearing sediments, using large-scale ice-saturated synthetic cubic models. experiments...

Hydraulic fracturing is a crucial technology for developing unconventional oil and gas resources, widely used to enhance low-permeability reservoirs. To clarify the complex fracture propagation behavior in Shahejie Formation III of Dagang Oilfield, Bohai Bay Basin, typical reservoir, we conducted laboratory experiments using physical models along with numerical simulations based on cohesive element method. These approaches were study impact various formation operational parameters morphology...

The fracability of carbonate reservoirs is a key indicator for evaluating whether can be effectively fractured. Taking the fractured-vuggy reservoir in Shunbei block as an example, microscopic characteristics and mechanical properties this were analyzed. test results showed that core microstructure relatively dense, micropores microfractures are developed, mineral composition characterized by "high few impurities". compressive strength, Young's modulus, Poisson's ratio rock increased with...

Abstract Fracture pressure is an important reference for wellbore stability analysis and hydraulic fracturing. Considering the low prediction accuracy, significant deviations, limited applicability of traditional methods predicting formation fracture pressure, this paper proposes intelligent method using conventional well logging data based on Stacking ensemble algorithm. The base learners model include RF, KNN, LSTM algorithms with correlation. meta-learner adopts XGBoost effectiveness...

Abstract Clearly determining the magnitude of fracture pressure is a crucial indicator for fracturing design. Traditional methods predicting suffer from challenges such as difficulties in obtaining required data, low prediction accuracy, and local limitations application. In light these issues, article proposes model based on reinforcement learning XGBoost utilizing geophysical well logging data. Based relevance analysis, optimal input parameters, including DEPTH, DEN, AC, GR, CRL, RT, are...

Reservoir rocks of the Pearl River Mouth Basin’s Lufeng Sag have low porosity (average 12.6%) and permeability 16.5 mD), requiring hydraulic fracturing to obtain economic production oil gas. To contribute understanding these reservoirs, promote successful in region, we analyzed mechanical properties tight sandstone. Moreover, introduced shear/tensile strength factor, combination with fracture toughness horizontal stress difference coefficient, as an innovative approach characterize ease...

An active RFID tag design based on nRF24L01 is proposed in this paper. This works 2.4GHz. The requirements for low power consumption and system complexity of tags have been well considered. circuit diagram the communication protocol are fully described Particularly, an anti-collision algorithm has to improve effectiveness thecommunication protocol.

Recognizing license plate from its traffic camera captured images is one of the most important aspects in many management systems.Despite sophisticated recognition related algorithms available online, still a hot research issue because plates each country all round world lack uniform format and their are often affected by multiple adverse factors, such as low resolution, poor illumination effects, installation problem etc.A novel method proposed this paper to solve inclination through four...

Wellbore leakage mostly occurs in structurally developed fractured formations. Analyzing the real-time rate during drilling process plays an important role identifying mechanism and its rules on-site. Based on principles of fluid mechanics using Herschel-Bulkley (H-B) fluid, by reasonably simplifying performance parameters, fracture roughness characteristic pressure difference between wellbore formation, radial extension length model is improved to improve calculation accuracy. Using Euler...

Because coal is quite weak compared with conventional sandstone, shear failure downhole will produce a large amount of nanoscale fines during the drainage process. Since size pores in on range, these sometimes cause serious damage problems downhole. The origin cannot be explained by sand prediction theory, which was previously designed for sandstone. During process, situ stress change caused combination poroelastic effect, methane desorption and compression around borehole. To prevent fines,...

This study utilized high resolution and fidelity Q‐Marine surface seismic data to quantitativel characterize multi‐level reservoir sands predicting delineating porosity water saturation distribution. Rock physical analysis showed that shale, brine sand hydrocarbon may be defined but in order achieve this, quality was required conjunction with simultaneous pre‐stack inversion derive rock properties. From this acoustic impedance Poisson's ratio are shown good discriminators of bearing when...

Abstract When a single-channel pump is used to transport living things, the rotating action of impeller will cause damages things. To improve survival rate for transporting things and performance, effect wrap angle on performance was studied by numerical simulation. The external characteristic curve analyzed change pressure field flow in channel with grasped. pulsation at monitoring points analyzed, influence law obtained. This lays foundation subsequent design

In order to give scientific and rational targeted support design of the roadway under different rock conditions, ensure safety roadway, reduce costs. By theoretical analysis, establishing hidden dangers grading mechanical model, proposing method tunnel fall dangersclassification, on this basis, giving adaptive evaluation through existing branch engineering analogy, loose circle test method, calculations, numerical simulation methods supporting methods, determining calculation based roof...