Summary Chemical combination flooding techniques, particularly alkali/surfactant/polymer (ASP) flooding, have proved to be effective in enhanced oil recovery (EOR). The development of this technique the Daqing Oil Field (China) shows that it can prevent production declines and help companies increase profits. However, ASP chemical loss resulting chromatographic separation sandstone formations remain as limitations practice flooding. Laboratory investigations analyzed behavior characteristics...

Considering the need for low oil price, polymer flooding has been demonstrated to be vitally important enhanced recovery (EOR) in industry. However, polymer-stabilized emulsions form during displacement process, causing severe challenges oilfield surface production, including separation performance, high operation and maintenance costs, pollution of facilities, human health environmental threats. In this paper, formation rupture visco-elastic interfacial films are described. The...

3D object detection is one of the fundamental perception tasks for autonomous vehicles. Fulfilling such a task with 4D millimeter-wave radar very attractive since sensor able to acquire point clouds similar Lidar while maintaining robust measurements under adverse weather. However, due high sparsity and noise associated clouds, performance existing methods still much lower than expected. In this paper, we propose novel Semi-supervised Cross-modality Knowledge Distillation (SCKD) method...

The polymer flooding process has already been applied to the medium permeability type II reservoirs of Daqing Oilfield (China) enhance oil recovery. However, this faces a number challenges, such as efficiency, high injection pressure, formation blockage and damage, unbalanced absorption ratio, economical justification. In study, single-phase two-phase flow experiments are performed investigate adaptability with natural cores reservoirs. enhanced recovery (EOR) effects studied by physical...

The suitable protein-to-lipid ratio for juvenile large yellow croaker, Pseudosciaena crocea Richardson (initial body weight, 0.57 ± 0.11 g) was determined using practical diets in a 4 × 3 factorial experiment. Four dietary protein levels (34%, 37%, 42% and 47%) three lipid (7.5%, 10.5% 14.0%) were tested. Each of the 12 fed to triplicate groups croaker juveniles 60 days floating netcages (1.0 1.0 2.0 m3) sea. effects treatments on survival, weight gain, feed conversion ratio, efficiency...

Polymer flooding plays an important role in enhanced oil recovery (EOR), particularly China, where partially hydrolyzed polyacrylamide (HPAM) and hydrophobically associating water-soluble polymers (HAWP) are used onshore offshore reservoirs, respectively. Many researchers have highlighted the elasticity of HPAM, which can be to improve sweep efficiency, i.e., ratio area swept by injected fluid area. On other hand, fewer studies exist on HAWP. In this study, we investigate flow HAWP Xanthan...

Abstract The Upper-Convected Maxwell (UCM) model has been normally used to describe the rheological properties of polymer solutions. However, this considers only viscosity and elasticity a fluid without including non-Newtonian power law behavior, very important property solutions in reservoirs. Therefore, we present Modified (MUCM) paper take into account property. steady flow mathematical MUCM fluids is established. characteristics viscoelastic dead ends porous pores reservoirs are...

Intravitreous long-acting drug delivery system offers an excellent alternative to multiple injections for the treatment of non-infectious uveitis (NIU). However, adverse effects non-biodegradable intravitreal implants fluocinolone acetonide (FA), such as postoperative hypotony and secondary injury during removal implant matrix, are frequent occurrence affect patient's complicance. Herein, biodegradable poly (lactic-co-glycolic acid) (PLGA)-based microspheres (MS) containing (FA@MS) were...

Abstract It is crucial to further investigate the microscopic flow mechanism associated with CO2 miscible and immiscible flooding, reveal displacement characteristics different heterogeneity, determine feasibility effectiveness of flooding. The phase field (PF) model utilized evaluate synergistic effects among injection velocity, oil viscosity, CO2-oil interfacial tension under miscibility reservoir heterogeneity conditions after water strong heterogeneous weak models are constructed analyze...

There have been some studies conducted about the single factor viscoelasticity of polymer solution or wettability effect on micro-flow mechanism flooding. In this paper, flow in dual heterogeneous reservoir considering and gravity was studied. The influences rock particle shape characteristics were studied based saturation pressure distribution. Compared with simulation results flooding three different shapes porous media, oil displacement efficiency circular model is highest at 91.57%,...

This article introduces an efficient tilt operator for harmonic fields. In optical modeling and design, a field tilting operation is often needed, e.g., the propagation of between non-parallel planes, since most existing operators only deal with case parallel planes. Such enables various components, like prisms tolerancing tilted components. The rigorous method to calculate vectorial fields on theory applies non-equidistant sampling in k-space before rotation order obtain equidistant rotated...

Oil recovery, including conventional and viscous oil, can be improved significantly by flooding with polymer solutions. This chemical method increase oil production, it improve the macrodisplacement efficiency microsweep efficiencies. In this study, we establish physical models that include dead-end complex based on pore-network pattern etched into glass, using snappyHexMesh solver in OpenFOAM. These capture complexity topology of porous media geometry. We a mathematical model for transient...

Significant quantities of oily sludge are formed in the process oil production. As a multiphase mixture, it shares characteristics high emulsion stability and faces challenges disposing, storing, discharging. The surface engineering operations directly affected by sludge, petroleum industry environments threatened simultaneously. An investigation characterizing composition properties Daqing oilfield was carried out recently. One kind disposal equipment established, large scale simulation...

Abstract Most experimental results demonstrate that the first normal stress difference of viscoelastic polymer solution is higher than second difference. Therefore, Upper-Convected Maxwell (UCM) equation adapted to describe this property. The steady flow mathematical model UCM fluids established. simulation Finite Volume Method are given. can effectively ensure convergence together with improvement in calculation accuracy. Weissenberg number (We) be calculated 3.2, which by Differential...