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Collaborating Authors
University of Western Australia
Case History of Dehydration-Technology Improvement for HCPF Production in the Daqing Oil Field
Wang, Zhihua (Northeast Petroleum University) | Lin, Xinyu (Northeast Petroleum University) | Yu, Tianyu (University of Western Australia) | Hu, Zhiwei (Daqing Oilfield Company Limited) | Xu, Mengmeng (Northeast Petroleum University) | Yu, Hongtao (Northeast Petroleum University)
Summary High-concentration polymer flooding (HCPF) is an enhanced-oil-recovery (EOR) method that has been used since conventional polymer flooding was applied in the main reservoirs of the Daqing oil field because its higher viscoelasticity can improve the oil-displacement efficiency. However, as a result of more produced hydrolyzed polyacrylamide (HPAM), the oil/water mixture is emulsified easily and separated with more difficulty. In this work, a case history of dehydration technology for HCPF production in the Daqing oil field is reviewed, and a laboratory investigation to assess the emulsification behaviors of HCPF-produced emulsions is conducted. Besides the dehydration-mechanism description of a high-voltage pulsed electrical field, electrostatic-demulsification performance for produced liquid from HCPF production is improved, and the operation parameters are optimized. Recent actual acceptance of the optimization recommendations is presented, and the field-application results are also discussed. The results indicate that dehydration technology for the Daqing oil field has been innovated with the industrialization of the EOR process. Traditional methods of gravity or centrifugal settling are replaced; this upgraded freewater knockout (FWKO) has the functions of adsorption, wetting, collision and coalescence, and oil pretreating for HCPF production. Because it is dominated by periodic vibration as its main mechanism, the pulsed-direct-current (DC) electrostatic-demulsification technique has some advantages in overcoming the obstacles encountered by regular types of electrical-field dehydration processes at strong emulsification stability. Compared with previous dehydration processes having complex alternating-current (AC)/DC electrical fields, the process with a pulsed-DC electrical field shows a unique advantage in terms of emulsified water-separation efficiency, energy conservation, environmental protection, lower labor intensity, and more-stable operation, and the dehydration performance meets the oil-treating standards. As the surface-matching technology of EOR, this improvement in dehydration technology is significant for promoting the construction of an HCPF demonstration project and accelerating petroleum development and production efficiently.
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Yian Formation (0.99)
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Mingshui Formation (0.99)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Chemical flooding methods (1.00)
- Facilities Design, Construction and Operation > Processing Systems and Design > Separation and treating (1.00)
- Facilities Design, Construction and Operation > Processing Systems and Design > Dehydration (1.00)
Opportunities for Fluorocarbons Interior Coating Technology in ASP Flooding EOR: Evaluation of Corrosion Protection and Drag Reduction
Wang, Zhihua (Northeast Petroleum University) | Lin, Xinyu (Northeast Petroleum University) | Zhang, Lei (Northeast Petroleum University) | Zhong, Huiying (Northeast Petroleum University) | Fan, Meng (Daqing Oilfield Company Limited) | Yu, Tianyu (University of Western Australia)
Abstract Alkali/surfactant/polymer (ASP) flooding technology has become an important way to enhance the oil recovery and improve the recoverable reserves in Daqing Oilfield. However, the problems of corrosion that surface facilities encounter with still remain very challenging in ASP flooding production, especially in the strong base (NaOH) fields. In this paper, the situation of corrosion in the ASP flooding surface system in Daqing Oilfield is surveyed, and several measures of anticorrosion operated in production are demonstrated. A program about coating the production facilities with fluorocarbons is proposed. The performance of the coating is tested, the nature of alkali and surfactant resistance is evaluated, and its mechanism of anticorrosion is explained. The drag reduction advantage of fluorocarbons interior coating is confirmed by conducting a series of comparison experiments. The procedure of the coating is optimized and validated with the actual operational data from a known ASP flooding pilot area in Daqing Oilfield. The surveys indicate that serious corrosion occurs in ASP solutions preparation tanks, injection system, gathering and disposal facilities of produced liquid. The defects such as bulging, damaging and falling away, appear frequently in the epoxy coatings which stand for the most traditional measure. There are many high-energy C-F bonds in fluorocarbon paint, and the corrosion resistance and self-cleaning of the coating with low surface energy are excellent after the film-forming. The performance parameters of adhesion, flexibility and impact strength determine that the coatings can resist chemical erosion and osmosis diffusion of alkali and surfactant solutions in different degrees. By reference to the uncoated and the epoxy coating flowlines, the drag reduction rate of ASP flooding produced liquid in fluorocarbon coating flowlines achieve 52.75% and 31.64% respectively in the same flow condition, and the effects impacted by temperature are negligible. Furthermore, the practice in strong base (NaOH) ASP flooding pilot area obtains satisfactory with the advisable procedure. This paper emphasizes the extension of fluorocarbon coating technology is promising in addressing the operational problems and the coating failures. The case study is beneficial to design another pattern-flood pilot and accelerate further application of ASP flooding.
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Yian Formation (0.99)
- Asia > China > Heilongjiang > Songliao Basin > Daqing Field > Mingshui Formation (0.99)
Extracting body waves from ambient seismic recordings
Girard, Aaron (University of Western Australia) | Shragge, Jeffrey (University of Western Australia)
METHODS Direct imaging of ambient seismic data will require body We have conducted several experiments to explore the body waves to be extracted from the recordings. We use a dataset waves in the Lalor Lake dataset to extract the information from from an mine site in Manitoba, Canada, and a number of data the ambient recordings. Ambient recordings were measured analysis techniques aimed at extracting body waves from ambient for more than eight days in March 2013 at the Lalor Lake mine seismic recordings. The four tools used here are data audification, site in Northern Manitoba, Canada. The first step was to extract power spectral density plots, cross-correlations to some records from the dataset and try to find the optimal identify plane wave energy, and plane-wave dip spectra plots.
Integrated geophysical joint inversion using petrophysical constraints and geological modelling
Giraud, Jeremie (University of Western Australia) | Jessell, Mark (University of Western Australia) | Lindsay, Mark (University of Western Australia) | Parkyuz-Charrier, Evren (University of Western Australia) | Martin, Roland (Université Paul Sabatier)
ABSTRACT We introduce and test a workflow that integrates petrophysical constraints and geological data in geophysical inversion in order to decrease the effect of non-uniqueness and to improve imaging. This workflow uses petrophysical measurements to constrain the values retrieved by geophysical inversion. Geological modelling is used to define petrophysical constraints spatially and to provide starting models. We integrate the different sources of information in a Bayesian framework that quantitatively unifies geological modelling, petrophysical measurements and geophysical data. It accounts for the levels of prior knowledge related the various sources of information. Inversion modifies the model accordingly to honor the different datasets. This methodology was tested using synthetic datasets in order to validate the methodology and to assess its robustness, for gravity and magnetic data. The results show that the use of petrophysical constraints during inversion increases contrasts in inverted models. Prior structural information from geological modelling allows for better retrieval of the geometry of geological structures. Overall, the integration of the different constraints reduces model misfit and provides geologically consistent geometries. Presentation Date: Wednesday, October 19, 2016 Start Time: 1:55:00 PM Location: 141 Presentation Type: ORAL
- Geophysics > Magnetic Surveying (1.00)
- Geophysics > Gravity Surveying (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling (0.47)
Passive wavefield imaging using the energy norm
Rocha, Daniel (Colorado School of Mines) | Sava, Paul (Colorado School of Mines) | Shragge, Jeffrey (University of Western Australia)
We propose a new imaging condition that is based on energy conservation and is directly related to the We propose an imaging condition for passive seismic source mechanism. Unlike the correlation between decomposed data similar to the PS imaging condition, but without P-and S-wavefields typically used in passive step (2) wave-mode decomposition. Our imaging elastic imaging, our imaging condition compares condition attenuates the correlation between identical wavemodes present in the displacement field without waves modes in the displacement field and highlights costly wave-mode decomposition, and produces a strong the correlation of di erent modes at the source. Based and focused correlation at the source location. Numerical on energy conservation of elastic wavefields, we define an experiments demonstrate the advantages of the proposed imaging condition as the di erence between the kinetic imaging condition (compared to PS correlation), and potential terms of a wavefield, which are computed its sensitivity with respect to velocity inaccuracy and using just the displacement field. This imaging condition sparse acquisition, and its quality and e cacy in estimating is successful in elastic imaging with attenuated artifacts the source location.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Passive Seismic Surveying > Microseismic Surveying (0.74)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (0.69)
Full-wavefield tomography for seismic monitoring
Witten, Ben (University of Western Australia) | Shragge, Jeffrey (University of Western Australia)
ABSTRACT We present a method for updating P- and S-wave velocity models from (micro-) earthquake waveforms recorded on passive seismic arrays using wave-equation migration and image-domain tomographic inversion. Although seismic waves generated from an earthquake are fundamentally an elastic phenomena, we use independent acoustic approximations for both the P- and S-wave propagation. Our method requires no arrival picking and can thus be used with low signal-to-noise data. It also does not rely on initial estimates of the source locations, and neither on origin time nor known events such as perforation shots. This allows for the application of the method in situations with minimal control points, such as induced seismic monitoring. In this paper we present the inversion theory and provide a synthetic example to show its potential applicability. Presentation Date: Monday, October 17, 2016 Start Time: 3:20:00 PM Location: 144/145 Presentation Type: ORAL
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (1.00)
- Geophysics > Seismic Surveying > Passive Seismic Surveying (1.00)
Numerical Study on Steady Flow around a Pipeline Laid on Seabed with Gaps
Tong, Feifei (University of Western Australia) | Cheng, Liang (Dalian University of Technology)
Abstract This paper presents numerical results from three-dimensional Large Eddy Simulations (LES) of steady flow around a pipeline close to an uneven seabed with staggered gaps underneath it. It was found that even small gaps below a pipeline can lead to great changes in the hydrodynamics along the span, as well as the seabed shear stress. It is observed that the total forces can be calculated by independently considering the gap section and the embedded section; however, the spanwise variation in the configuration leads to much energetic vibrations in sectional forces. The instantaneous flow feature across the span, however, appears to be less affected by the gaps, where a coherent turbulent structure is found to develop in the upstream and break down above the pipeline. Introduction The research on pipeline hydrodynamics has been largely driven by the wide use of pipelines for transporting oil and gas products across ocean floors, which has been well documented in the monograph by Sumer & Fredsøe (1997) and papers by Bearman & Zdravkovich (1978), Zdravkovich (1985) and Lei, Cheng & Kavanagh (1999), among others. Most of the research was concerned with pipelines either embedded in or spanned above the seabed uniformly along the pipeline. Due to either uneven seabed or local scour below the pipeline, however pipeline/seabed contacts are unlikely uniform. It is expected that the non-uniformity of pipeline-seabed configuration will affect the hydrodynamic forces on the pipeline and the associated flow features around the pipeline. To date, little research has been reported with regard to this issue. This motivated the present study. Problem Definition As illustrated in Fig. 1, this paper investigates steady flow around a pipeline (represented by a circular cylinder) laid on an uneven seabed, mimicking a situation where the pipeline is partially embedded at certain locations, while free spanned at other locations.
- Reservoir Description and Dynamics > Reservoir Simulation (0.94)
- Facilities Design, Construction and Operation > Pipelines, Flowlines and Risers > Offshore pipelines (0.90)
- Data Science & Engineering Analytics > Information Management and Systems (0.69)
- Production and Well Operations > Well & Reservoir Surveillance and Monitoring (0.69)
Hydrodynamic Forces of a Yawed Square Cylinder in Oscillating Flows
Lou, Xiaofan (University of Western Australia) | Zhou, Tongming (University of Western Australia) | Cheng, Liang (University of Western Australia)
Abstract The effect of yaw angle (α) on hydrodynamic forces of a yawed square cylinder oscillating in still water is studied experimentally. The independent principle (IP) was examined by evaluating the hydrodynamic coefficients that derived from the measured in-line and lift forces using a 3-component force link at a Keulegan-Carpenter (KC) number range of 3~30 and a Stokes parameter (β) range of 500~1600. Significant differences are observed in normalized drag and inertia coefficients for the KC ranges of 8~20 and 10~18, respectively, indicating the invalidity of the IP. The peak on the spectra of the lift force becomes pronounced as α becomes larger, which implies that the yaw angle has an intensified effect on the vortex shedding process around a square cylinder in oscillatory flow. Introduction Oscillatory flow around a cylindrical structure is of importance due to its intrinsic interest in theoretical hydrodynamic research and its relevance to practical engineering applications. Knowledge of the hydrodynamics is essential for both the design and operation of offshore structures, such as semisubmersibles and tension leg platforms. For some cylindrical structures, owning to their directionality, the sea waves and currents can approach the structures obliquely. In these cases, the fluid velocity in the axial direction of the structure is not negligible, which may have profound effect on the vortex instability and force characteristics of the structure.
- Asia (0.28)
- North America > United States (0.28)
Numerical simulations of flow around a circular cylinder at high Reynolds number
An, Hongwei (University of Western Australia) | Cheng, Liang (University of Western Australia) | Zhao, Ming (Western Sydney University) | Tong, Feifei (University of Western Australia)
Abstract The flow around a circular cylinder at Reynolds numbers near the drag crisis was numerically simulated based on a dynamic Smagorinsky Large Eddy Simulation (LES) model at two Reynolds of Re = 1.0 × 10 and 6.0 × 10. The flow structures and the hydrodynamic force on the cylinder were analyzed. The numerical results show that the results at Re = 1.0 × 10 follow the key feature of subcritical turbulent flow and the results with Re = 6.0 × 105 capture the main features of the supercritical flow. This demonstrates that the Dynamic Smagorinsky LES model is a suitable numerical method for exploring high Reynolds flow around a circular cylinder. Introduction Slender structures are commonly used in civil, mechanical and offshore engineering, such as skyscrapers, chimneys, tubes in heat exchangers, bridge piers, subsea pipelines, risers and supporting frames of offshore platforms. Due to the strong engineering application background, hydro-/aerodynamics associated with slender structures have been widely researched. The flow around an isolated cylinder involves most of the generic flow features (flow separation, vortex shedding, recirculation, transition of turbulence within the wake and in the boundary layer), thus providing an excellent model for gaining insight into fluid mechanics around structures. As an important flow-structure interaction model, large amount of research about flow around circular cylinders has been published (Sumer and Fredsøe 1997, Zdravkovich 2003).
- Research Report > New Finding (0.48)
- Research Report > Experimental Study (0.34)
Abstract For typical soft over strong soil stratigraphies such as soft clay overlying relatively stronger sand layer, the squeezing solution developed by Meyerhof and Chaplin (1953) is generally recommended in industry guidelines. The solution was developed primarily for flat circular foundation resting in clay underlain by an infinitely stiff rigid layer. Its application to offshore jackup foundations operating in multi-layer stratigraphies needs to be examined from two aspects. Firstly, to improve positioning and extraction jackup foundations are typically conical in shape and secondly, soil is of finite stiffness. To investigate the squeezing mechanism in more detail an extensive centrifuge testing program has been conducted utilising the UWA drum centrifuge in clay with interbedded sand. High-resolution digital images are captured in flight and analysed using the PIV (particle image velocimetry) technique providing insight into the soil failure mechanisms. The centrifuge tests indicated that the bearing resistance in the top clay layer is not independent of the underlying sand and clay layers as assumed in the squeezing theory and also observed consistently in field CPT tests. It was consistently shown that the resistance of the top clay layer strongly correlates with the peak bearing capacity (qpeak) in the underlying sand layer. Complementary large deformation finite element (LDFE) analyses are conducted in soft clay overlying a rigid stratum improving on the squeezing factors adopted in Meyerhof's theory. The LDFE analyses revealed that the conical tip of spudcan foundation precludes the generation of higher resistance near the rigid base predicted by the squeezing theory. The performance of the squeezing approach shows poor performance when compared with carefully controlled centrifuge experiments. A new approach is suggested in which the bearing capacity in the top clay layer can be adequately predicted by successfully overcoming the limitations of the squeezing theory.
- Research Report > Experimental Study (0.72)
- Research Report > Strength High (0.53)