Experimental study on stability and rheological properties of aqueous foam in the presence of reservoir natural solid particles

The authors would like to acknowledge the school of engineering at the University of Aberdeen and University Technology Malaysia (UTM) to provide required materials and facilities to complete this research.Peer reviewedPostprin

Forecasting by Stochastic Models to Inflow of Karkheh Dam at Iran

Forecasting the inflow of rivers to reservoirs of dams has high importance and complexity. Design and optimal operation of the dams is essential. Mathematical and analytical methods use for understanding estimating and prediction of inflow to reservoirs in the future. Various methods including stochastic models can be used as a management tool to predict future values of these systems. In this study stochastic models (ARIMA) are applied to records of mean annual flow Karkheh river entrance to Karkheh dam in the west of Iran. For this purpose we collected annual flow during the period from 1958/1959 to 2005/2006 in Jelogir Majin hydrometric station. The available data consists of 48 years of mean Annual discharge. Three types of ARIMA (p, d, q) models (0, 1, 1), (1, 1, 1) and (4, 1, 1) suggested, and the selected model is the one which give minimum Akaike Information Criterion (AIC). The Maximum Likelihood (ML), Conditional Least Square (CLS) and Unconditional Least Square (ULS) methods are used to estimate the model parameters. It is found that the model which corresponds to the minimum AIC is the (4, 1, 1) model in CLS estimation method. Port Manteau Lack of fit test and Residual Autocorrelation Function (RACF) test are applied as diagnostic checking. Forecasting of annual inflow for the period from 2006 to 2015 are compared with observed inflow for the same period and since agreement is very good adequacy of the selected model is confirmed

Modeling Climate Variables of Rivers Basin using Time Series Analysis (Case Study: Karkheh River Basin at Iran)

Stochastic models (time series models) have been proposed as one technique to generate scenarios of future climate change. Precipitation, temperature and evaporation are among the main indicators in climate study. The goal of this study is the simulation and modeling of climatic parameters such as annual precipitation, temperature and evaporation using stochastic methods (time series analysis). The 40-year data of precipitation and 37-year data of temperature and evaporation at Jelogir Majin station (upstream of Karkheh dam reservoir) in western of Iran has been used in this study and based on ARIMA model, The auto-correlation and partial auto-correlation methods, assessment of parameters and types of model, the suitable models to forecast annual precipitation, temperature and evaporation were obtained. After model validation and evaluation, the Predicting was made for the ten future years (2006 to 2015). In view of the Predicting made, the precipitation amounts will be decreased than recent years. As regards the mean of annual temperature and evaporation, the findings of the Predicting show an increase in temperature and evaporation

A mitigation strategy for productivity impairment in sandstone reservoirs with varying clay mineralogy

Funding Information: Michael Chuks Halim gratefully acknowledges the financial support of Petroleum Technology Development Fund (PTDF) Nigeria through the award of PhD studentship and Seplat Petroleum Development Company for providing the core samples used for experiments. Publisher Copyright: © 2023 The AuthorsPeer reviewedPublisher PD

Minimizing formation damage in drilling operations : A critical point for optimizing productivity in sandstone reservoirs intercalated with clay

Funding: This work was funded by Petroleum Technology Development Fund (PTDF) of Nigeria through the award of a PhD scholarship to Michael Chuks Halim. Acknowledgments: Michael Chuks Halim gratefully acknowledges the financial support of the Petroleum Technology Development Fund (PTDF) of Nigeria through the award of a PhD scholarship.Peer reviewedPublisher PD

Comparison of Two Different Protocols for the Treatment of Acute Escherichia coli Mastitis in Dairy Cattle

E-coli mastitis is one of the most frequent causes of environmental mastitis in the dairy cattle worldwide. The purpose of this field study was to compare the efficacy of ceftiofur (HCL) in conjunction with supportive measures versus supportive measures alone for treatment of dairy cows affected with naturally occurring acute form of E. coli mastitis. From January 2014 to December 2016 a total number of 100 cows naturally affected by acute E-coli mastitis randomly were allocated into two groups. A milk sample from the affected quarter was collected for bacteriological tests on the first day of treatment. In group A (control), fifty cows received ceftiofur (HCL) 1mg/5kg/BW, flunixin meglumine 2.2mg/kg, calcium borogluconate 40%, 250ml and hypertonic saline (Nacl 7.2 %,) 5ml/kg. In group B (treatment, n=50), cows received the same drugs mentioned for group A, except ceftiofur (HCL) which replaced by placebo. In the group A, 41cows (82%) and in the group B, 2 cows (4%) were survived respectively. The rates of quarter health recovery in the groups A and B were 31.7% and 0% respectively. The differences between two groups were significant (P≤0.01). In conclusion our results indicated that treatment of cows affected with naturally occurring acute form of E. coli mastitis without application of effective antibiotic(s) such as ceftiofur (HCL) and fluid therapy almost impossible

Ultrasound based technology for removal of scale from downhole production tubing, an experimental verification

Open Access via the Elsevier Agreement The authors are grateful to the Net Zero Technology Center (NZTC) and University of Aberdeen UK, for providing the laboratory facilities required to complete this research.Peer reviewe

Effects of Ultrasound on the Removal of Emulsion Plugging in Oil Reservoirs

The authors are grateful to the Tertiary Education Trust Fund (TETFund) of Nigeria and University of Aberdeen UK, for providing the laboratory facilities required to complete this research.Peer reviewedPublisher PD

A conversation analysis of the Iranian youths\u27 written chats of English

The ever-increasing application of computer and internet mandates a longer domain for computer-mediated-communication (CMC). Internet chat as a principal feature of CMC has attracted tremendous attention among the youths in recent years. Thus, this study has focused on the written chats of 100 Iranian university students majoring in different disciplines. We analyzed 400 chat samples (composed of 4000 moves) in terms of opening and continuing speech functions based on Eggins and Slade&rsquo;s (1997) model of casual conversation. We also examined humor and paralinguistic features based on taxonomies of Huffaker and Calvert (2005) and Nastri, Pen a, and Hancock (2006). Among the various types of speech functions, nine opening speech functions, seven continuing speech functions and four humor and paralinguistic features were investigated. The analysis of the data shows that the salient opening speech function has been&lsquo; statement: opinion&rsquo; which provides attitudinal and evaluative information. Additionally, the outstanding types of continuing speech functions are &lsquo;prolong: extend&rsquo;, &lsquo;prolong: enhance&rsquo;, and &lsquo;append: elaborate&rsquo;. Therefore, it is in order for the participants to offer additional or contrasting information to the previous move or qualify it by giving details of time, place, condition, etc. Moreover, in case of interruption by the other chatter, the participants mostly tend to clarify, exemplify or reiterate the previous move. Furthermore, the participants produced irony, as a humorous element, in a great volume which is indicative of their tendency toward being indirect during conversation. The subjects also used many paralinguistic features such as misspellings and repeated punctuations in order to express their emotions and attract their partners&rsquo; attention in the absence of verbal communication.<br /