المجلد السادس - العدد الاول - يونيو 2016

Modeling of Flow Passing Backward Facing Step

2024-12-01T08:28:33Z

Modeling of Flow Passing Backward Facing Step Mohamed Milad Ahmed Flows passing sudden diameter expansion of ducts can be found in many industrial situations such as flows in annular spaces between drill pipes and open or cased holes while circulating drilling fluids down the wells and up the annular spaces to surface during oil and gas wells drilling. As a first step towards understanding the flow behavior in situation like theses, a simulation of flows similar to this has been carried out. This paper presents results of a computational study of steady, compressible flow over a backward facing-step in a wide, two dimensional duct. The flow in this duct has been investigated experimentally by previous workers ]1[ and so provides a useful benchmark test case. In the present work the commercial CFD code Fluent v6.0.20 is used to compute results for the range of Reynolds numbers 70 < Re < 7000, where Re is based on two-thirds of maximum velocity and duct height upstream of the step. This range includes the laminar, transitional and low Reynolds number turbulent flow regimes, for which significant variations in the separation length have been measured. The results to be presented will include the variation of velocity distributions and separation lengths for the recirculating flow region downstream of the step with Reynolds number

Developments in Parabolic Solar Dish Concentrator for Enhanced System Efficiency of Steam Generation

2024-12-01T08:25:40Z

Developments in Parabolic Solar Dish Concentrator for Enhanced System Efficiency of Steam Generation Imhamed M. Saleh; Khalifa Khalifa; Mohamed Bughazem; Nabil Algharbi In this paper, design and fabrication of the parabolic solar dish concentrator for the steam generation have been carried out. The experimental setup consists of the parabolic dish of solar concentrator system is fabricated with highly reflective mirror. The concentrated heat is absorbed by a copper tube which is made up of coil in a curved shape and it is fixed on solar trace path to obtain maximum solar energy. The black coating over the receiver surface to reduce the various losses it is located in the focal point on the solar ray’s concentration and its core application in steam granulation coil receiver, heat transfer fluid as water and it is going through the system. The present study concerning the development and design of the parabolic dish solar concentrator indicates a diameter of 2.4 meters to obtain a concentration ratio of 91.16×. The outdoor experimental of a parabolic dish concentrator has been tested. The performance of parabolic dish concentrator studied for different experimental conditions. The outdoor experimental has also been carried out to estimate outlet temperature. The maximum temperature of 635 °C has been recorded, when the flow rate is 0.4 kg / min.

Evaluation of Demulsifier for AGOCO, Nafoora Oilfield, Libya: Demulsifier Bottle Test

2024-12-01T08:20:29Z

Evaluation of Demulsifier for AGOCO, Nafoora Oilfield, Libya: Demulsifier Bottle Test Salem Omar Mansour Continued advances in technology have increased the demand of crude oil. The most common types of problems encountered in oil and gas production operations is Emulsions (Normal or Reverse). The formation of water and oil emulsions is largely unavoidable in the petroleum industry. Break-up of these oil field emulsions is important either for recovery of crude oil or environmental cleanup in the oil field. The oil field emulsions, especially the water-in-oil type of emulsions, are very difficult to break. Chemicals products used to break emulsion and separate oil. Oil production companies contract with professional companies in chemical treatment. One of these companies is JOWF OIL TECHNOLGY COMPANY that product chemicals to break emulsion. One of these products is JOF BREAK 6266 that used in this study. JOF BRAIK 6266N is a blend of alkoxylated resins, epoxy compounds and high molecular weight polyols in an aromatic solvent. This class of chemicals is commonly used in oilfields for separation of oil and water from the emulsion. Several concentrations of JOWFE products coded ( BI 9,BI 12 and BI 26) that used in this study were screened by using standard bottle test. JOF BRAIK 6266N (BI 09) is found to be suitable for demulsification of water and oil from the crude oil/water emulsion of Nafoora field gives better performance than the chemical used (NALCO) at present in the field at the lower and same concentration. JOF BRAIK 6266N was tested in laboratory for the compatibility of other additives and was found to be compatible.

Analysis of Pressure Data from The Horizontal Wells with Multiple Hydraulic Fractures in Shale Gas

2024-12-01T08:17:07Z

Analysis of Pressure Data from The Horizontal Wells with Multiple Hydraulic Fractures in Shale Gas Essa Tabar; Kkashayar Aminian In the last several years, the unconventional gas reservoirs development has grown tremendously. Most of these unconventional reservoirs have very low permeability and are not able to produce an economic flow rate without stimulation treatments. The common method to improve the production is by a horizontal well with multiple hydraulic fractures. Hydraulic fracturing is a stimulation practice to improve the permeability in order to obtain commercial production. Horizontal wells with multiple hydraulic fracture treatments have proven to be an effective method for development of unconventional reservoirs. The objective of this paper is to investigate the interpretation of pressure transient responses from horizontal wells with single and multiple hydraulic fractures using the commercial reservoir simulator. In addition, the paper will focus on identifying the impact of the reservoir and fracture properties on the flow regimes of a horizontal well producing from the low permeability reservoirs. The different flow regimes appear during horizontal-well transient flow. However, the existence of these flow regimes is closely associated with the dimensions of the half length of the fracture, fracture permeability, drainage area, horizontal well length, etc. Hence, it is common that some flow regimes are not present.