scholarly journals Expert solution for effects of input parameters on multiphase flow correlations

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
Mohamed A. Abd El-Moniem ◽  
◽  
Ahmed H. El-Banbi ◽  
Keyword(s):  
Expert System ◽  
Pressure Drop ◽  
Oil And Gas ◽  
Gas Production ◽  
Oil Wells ◽  
Gas Wells ◽  
Oil And Gas Production ◽  
Input Parameters ◽  
Bottomhole Pressure ◽  
Selection Of

Oil and gas production represents an essential source of energy. Optimization of oil and gas production systems requires accurate calculation of pressure drop in tubing and flowlines. Many empirical correlations and mechanistic models exist to calculate pressure drop in tubing and flowlines. Previous work has shown that some correlations provide more accurate results under certain flow conditions, PVT data, and well configurations than others. However, the effects of errors in input data on the selection of which correlations to use have not been investigated. This paper studies different multiphase flow correlations to determine the effects of their input parameters on (1) the accuracy of calculated pressure drop and (2) the selection of best correlation. A database consisting of 33 oil wells and 32 gas wells was selected, and a commercial software was used to build different well models. A total of 715 well models were constructed and used to investigate the effects of errors in correlations inputs on both the calculated bottomhole pressure and the selection of best correlation(s). The methodology was based on perturbing the values of the selected input parameters and calculating the new predicted bottomhole flowing pressure. Then, the effects of error in input parameters on how the calculated bottomhole pressure was different from observed data were quantified. The effect of this error in input parameters was also checked against the algorithm that selects the best correlation(s). It was found that errors in input GOR have the greatest effects for oil wells, while gas specific gravity and the tubing roughness are the most effective parameters for gas wells. The results were integrated into a rule-based expert system. A new set of data, consisting of 220 cases from 10 new oil wells and 10 new gas wells, was used to validate the expert system. The expert system was found to predict the best correlation(s) with a success rate of 80%, and it also identifies the input parameters whose error would affect the value of calculated bottomhole pressure significantly. Finally, the rules of the expert system were programmed into a VBA-Code to ease its use.

The Local Corrosion Rate Determination According to Weight Measurements Corrosion Coupons in Oilfield Conditions

2021 ◽  
Author(s):  
Valeriya Eduardovna Tkacheva ◽  
Andrey Nicolaevich Markin ◽  
Ignaty Andreevich Markin ◽  
Alexandr Yuryevich Presnyakov
Keyword(s):  
Carbon Dioxide ◽  
Maximum Rate ◽  
Oil And Gas ◽  
Gas Production ◽  
Oil Wells ◽  
Corrosion Monitoring ◽  
Carbon Dioxide Corrosion ◽  
Oil And Gas Production ◽  
Complicating Factors ◽  
Oilfield Equipment

Abstract Complications associated with a corrosive environment, according to Rosneft's data as of 01.01.2020, are among the prevailing at oil and gas production facilities and rank fourth among other factors complicating production - 12% the complicated mechanized wells. Failures due to corrosion are the second largest complicating factors. Based on the results of approbation, the article proposes a method for calculating the maximum rate of local carbon dioxide corrosion, applicable in oilfield conditions, including to complicated stocks of oil wells and pipelines of oil gathering systems. Based on the approbation results, a method for calculating the maximum rate of local carbon dioxide corrosion, applicable in oilfield conditions, including to complicated stocks of oil wells and oil gathering pipelines systems is proposed in the article. The proposed technique is realizable according to the results one of "traditional" methods the corrosion monitoring - weight (or gravimetric). The approbation results and application possibility the technique in the pilot tests process in assessing the protective ability of corrosion inhibitors and the selection the effective dosages in relation to local damages, which are the main cause the oilfield equipment failures according the factor "Corrosive aggressiveness" (one of the complicating factors in terms of gradation, adopted in the Rosneft Company regulations). On practical examples the oilfield equipment operation, the results of corrosion monitoring and the summary statistics the corrosive stock of wells (using the example of an oil Company), the current situation with respect to this type of complication and relevance the issue under consideration is shown.

Selection and Sizing of Velocity-Actuated Subsurface Safety Valves

1980 ◽  
Vol 102 (2) ◽  
pp. 82-91
Author(s):  
H. D. Beggs ◽  
J. P. Brill ◽  
E. A. Proan˜o ◽  
C. E. Roman-Lazo
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Oil And Gas ◽  
Design Criteria ◽  
Gas Wells ◽  
Flow Rates ◽  
Oil And Gas Wells ◽  
Offshore Oil And Gas ◽  
Offshore Oil ◽  
Selection Of

Subsurface safety valves (SSSVs) are installed in offshore oil and gas wells to shut in the wells in case of pressure loss at the wellhead. The selection of these SSSVs requires prediction of the oil and gas flow rates at which the valve will close. A study was performed to improve the design criteria used in the selection. Improved correlations were developed to predict pressure drop across a SSSV as a function of flow rates, and the pressure drop at which a SSSV will close.

Arrangement Method of Offshore Topside Based on an Expert System and Optimization Technique

2017 ◽  
Vol 139 (2) ◽  
Author(s):  
Sung-Kyoon Kim ◽  
Myung-Il Roh ◽  
Ki-Su Kim
Keyword(s):  
Expert System ◽  
Design Problem ◽  
Oil And Gas ◽  
Optimization Technique ◽  
Optimization Method ◽  
Gas Production ◽  
Offshore Platform ◽  
Optimal Arrangement ◽  
Oil And Gas Production ◽  
Two Stages

An offshore platform has several modules that contain much of the equipment needed for oil and gas production, and these are placed on the limited space of the topside. Furthermore, the equipment layout should leave sufficient space in between to ensure operability, maintainability, and safety. Thus, the design problem to arrange the topside of an offshore platform can be difficult to solve due to the number of modules and equipment placed on the topside. This study proposes a method to arrange the offshore topside based on an expert system and multistage optimization in order to obtain the optimal arrangement that addresses various considerations and satisfies the given requirements. The proposed method consists of four components. First, an expert system is proposed to systematically computerize experts' knowledge and experience and to evaluate the feasibility of alternatives for the arrangement of the offshore topside. Second, a multistage optimization method is proposed to yield a better arrangement design by formulating the arrangement design problem as an optimization problem with two stages. Third, an arrangement template model (ATM) was proposed to store the arrangement data of the offshore topside. Fourth, the user interface was developed to run the expert system and for optimization. A prototype program was then developed to solve an floating, production, storage, and offloading (FPSO) topside problem in order to evaluate the applicability of the proposed method. The results showed that the proposed method can be used to obtain the optimal arrangement of an offshore topside.

scholarly journals Resource evaluation of geothermal power plant under the conditions of carboniferous deposits usage in the Dnipro-Donetsk depression

2018 ◽  
Vol 60 ◽  
pp. 00006 ◽  
Author(s):  
Mykhailo Fyk ◽  
Volodymyr Biletskyi ◽  
Mokhammed Abbud
Keyword(s):  
Oil And Gas ◽  
Statistical Processing ◽  
Gas Production ◽  
Geothermal System ◽  
Gas Wells ◽  
Geothermal Heat ◽  
Oil And Gas Production ◽  
Geothermal Potential ◽  
Ecological Aspects ◽  
Oil And Gas Wells

The objective of the work is to substantiate the actualization of the problem of obtaining geothermal energy from oil and gas wells of oil and gas production facilities in the central-eastern part of the Dnieper-Donetsk Depression (DDD). The research methodology is based on the collection and statistical processing geophysical data of the DDD oil and gas deposits, the use of balance equations for energy and substance matter. The main result of the work is that the principal technological scheme of the geothermal system has been developed and the geothermal potential of oil and gas wells in the experimental zone has been analyzed. There have been considered the technological and ecological aspects of geothermal heat usage from depleted deposits of the DDD wells, which were disclosed into Carboniferous deposits productive horizons.

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