scholarly journals Sand Control Technology for Low pressure Lost-Circulation Wells and Application in South Sudan

2022 ◽  
Vol 2152 (1) ◽  
pp. 012013
Author(s):  
Yong Wen ◽  
Huaiwen Li ◽  
Yingbin Zhu ◽  
Zhiyong Song ◽  
Yanshan Wang ◽  
...  

Abstract A kind of plugging proppants was developed for solving the problem of ‘easy to lose sand’, resulting in difficult sand control in low pressure lost-circulation wells in South Sudan Oilfield. The proppants can cement together to form a consolidated body with certain strength (≥2 MPa) and permeability (≥1.3 μm2) in oil layers. The body can temporarily plug lost circulation channels. Meanwhile, a supporting sand-adding tool was developed to simplify the proppants squeezed process, and a sand-carrying fluid was optimized to improve sand suspension performance and protect pay zones in low pressure lost-circulation wells. These measures formed a sand control technology for low pressure lost-circulation wells. 12 wells have been successfully applied in South Sudan Oilfield and achieved good effect on increasing oil production by 15 t/d.

Author(s):  
Huaiwen Li ◽  
Wei Liu ◽  
Lifei Shao ◽  
Xiaofang Wang ◽  
Chao Wang ◽  
...  

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ismail Aliyu Danmaraya ◽  
Aminu Hassan Jakada ◽  
Suraya Mahmood ◽  
Bello Alhaji Ibrahim ◽  
Ahmad Umar Ali

Purpose The purpose of this paper is to look at the asymmetric effect of oil production on environmental degradation in OPEC member countries from 1970–2019. Design/methodology/approach The authors build a nonlinear panel ARDL–PMG model using the Shin et al. (2014) nonlinear autoregressive distributed lag (ARDL) approach in panel form to assess both the short- and long-run impact of positive and negative oil production movements on CO2 emissions. Findings The result demonstrates that the variables are cointegrated. According to the linear long run coefficients, oil production, FDI inflows and economic growth both have a positive and significant relationship with CO2 emissions, implying that they deteriorate environmental quality in OPEC countries, while renewable energy has a negative relationship with CO2, implying that increasing renewable energy improves environmental quality. The asymmetric findings prove that positive and negative shocks of oil production exert a positive effect on carbon emissions in short run and long run. Research limitations/implications To begin with, the empirical assessments do not include all OPEC member nations; researchers are advised to resolve this constraint by looking at the economies of other OPEC members. Albeit the lack of data for other energy sources may serve as another constraint of this research, future research is expected to broaden the current framework via other energy sources such as nuclear, electricity, biomass, solar as well as wind. Originality/value The research adds to the body of knowledge as many of the prevailing studies in the literature failed to look at the asymmetric effect of oil production on the quality of environment. This is another gap in the literature that the current study is set out to fill. This study adds oil production as an explanatory variable and helps to extend the existing literature for OPEC countries, which could propose a solution to deal with ensuing environmental issues.


2018 ◽  
Vol 1 (1) ◽  
Author(s):  
Xueqi Liao

Porcine Reproductive and Respiratory Syndrome (PRRS) is caused by Porcine Reproductive and Respiratory Syndrome Virus (PRRSV), which is characterized by sow reproductive disorder and piglet respiratory syndrome. The complex pathogenesis of PPRS includes antibody-dependent enhancement, immune suppression and persistent infection in the body and viral genetic diversity. In order to have a better understanding of the occurrence and prevalence of porcine reproductive and respiratory syndrome in China. The review of PRRS etiology, epidemiology, pathogenesis, genetic variation, diagnosis and control technology and other aspects of the progress were carried out.


2021 ◽  
Vol 27 (7) ◽  
pp. 706-709
Author(s):  
Ma Jin

ABSTRACT Introduction: Traditional Chinese medicine has a very good effect on the treatment of exercise fatigue. However, if it is not handled actively and effectively, it can cause serious adverse effects on the body and lead to many diseases. Objective: To study the effect of TCM diagnosis and treatment on athletes’ exercise-induced muscle fatigue. Methods: The results of the study were analyzed by comparing the experimental data in the experimental group and the control group. Results: A paired t test was conducted on the experimental results of the experimental intervention group and the data of the control group. It was found that regardless of individuals being male or female, the paired t test results of the experimental group and the data of the control group were all P < 0.05, showing significant differences in the paired data. Conclusions: In the experiment, all the treatment methods of traditional Chinese medicine had an obvious effect in the treatment of exercise fatigue, and reduced the recovery time of exercise fatigue at different degrees. Contrastive analysis shows that traditional Chinese medicine is effective in the treatment of exercise fatigue. Level of evidence II; Therapeutic studies - investigation of treatment results.


2010 ◽  
Vol 34-35 ◽  
pp. 1666-1670
Author(s):  
Wei Zhang Wang ◽  
Xiang Zhen Yan

Sand inflow is one of the problems in unconsolidated sandstone oil reservoir recovery. The most frequently applied sandcontrol method is high-pressure gravel squeeze packing sand control technology. But incorrect knowledge of stratum shapes under high-pressure squeeze packing leads to unreasonable technology and implement parameters. This thesis, based on the discrete element theory and by means of two-dimension grain flow simulation software PFC2D, considers three oil wells with unconsolidated sandstone in terms of their cementing strengths . The simulation result shows that strata with diverse cementing strengths vary remarkably when high-pressure squeeze pack is asserted. Established calculation pattern might lead to sizable deviation.


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