Application of Dynamic Multi-stage Temporary Plugging Fracturing Technology in Directional Wells
Wang Jianhui,
Yin Guiqin,
Deng Xian’an,
Li Xiaoyan,
Chen Qiang,
Xiang Kui
Issue:
Volume 7, Issue 4, July 2019
Pages:
89-94
Received:
25 July 2019
Accepted:
26 August 2019
Published:
17 September 2019
Abstract: At present, the mainstream technology for the stimulation of tight reservoir which exists a large number of interlayer is "perforation concentrated & large-scale fracturing". But the fracture simulation and monitoring result indicates that the vertical zone of the reservoir actually isn't stimulated fully. To increase the degree of the reservoir stimulated, the stimulation mechanism of dynamic multistage temporary plugging fracturing, temporary plugging agent and technological parameter have been studied. By optimizing the combination of temporary plugging materials, dosage, construction parameters and adding speed, the temporary plugging material has stable performance, has played a good role in temporary plugging and boosting pressure in field tests. The critical technique which is characterized by "multi-cluster perforation, temporary plugging near wellbore and multistage fracturing" is developed, and the design concept of dynamic multi-stage temporary plugging fracturing pump injection is defined. The production of the test well is twice as the neighboring well, in addition, it can realize multistage fracturing in single operation to decrease the fracturing cost, which makes the technique a promising future.
Abstract: At present, the mainstream technology for the stimulation of tight reservoir which exists a large number of interlayer is "perforation concentrated & large-scale fracturing". But the fracture simulation and monitoring result indicates that the vertical zone of the reservoir actually isn't stimulated fully. To increase the degree of the reservoir st...
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Analytical Model for the Estimation of Leak Location in Natural Gas Pipeline
Obibuike Ubanozie Julian,
Ekwueme Stanley Toochukwu,
Ohia Nnaemeka Princewill,
Igwilo Kevin Chinwuba,
Onyejekwe Ifeanyi Michael,
Igbojionu Anthony Chemazu
Issue:
Volume 7, Issue 4, July 2019
Pages:
95-102
Received:
28 September 2019
Accepted:
23 October 2019
Published:
11 November 2019
Abstract: Mathematical model for leak location in natural gas pipeline has been developed in this paper. The model employs an isothermal steady state approach. Leak occurrence in the pipeline divides the pipeline into two sections-the upstream and downstream sections respectively. Analyses of leak incidences were carried out in the two pipeline sections giving rise to two equations being developed to address the leak localization. The first leak equation was developed by considering the upstream section of the pipeline while the second leak equation was developed by considering the downstream section of the pipeline. The two equations were analytically developed by slight modification of the Weymouth’s equation for gas flow in horizontal pipeline. Matlab software was used in the model simulation. Seven field data were used in the model simulation. The results from the Matlab simulation of the mathematical models developed gave the leak locations for each of the field cases. Comparison of the simulated results with actual results of leak locations determined experimentally revealed high level of accuracy with an average error of only 0.377% which is below the minimum acceptable limit. Furthermore analyses of results show that the two leak equations yield same results when used in the Matlab simulator. The model is highly suitable for accurate detection of leak in natural gas pipeline especially where economics and reliability is of essence.
Abstract: Mathematical model for leak location in natural gas pipeline has been developed in this paper. The model employs an isothermal steady state approach. Leak occurrence in the pipeline divides the pipeline into two sections-the upstream and downstream sections respectively. Analyses of leak incidences were carried out in the two pipeline sections givi...
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