Nitrogen Injection in the Cantarell Complex: Results After Four Years of Operation

2005 ◽  
Author(s):  
Jose Luis Sanchez Bujanos ◽  
Amado Valeriano Astudillo Abundes ◽  
Fernando Rodriguez-De La Garza ◽  
Jorge Morales ◽  
Alfonso Rodriguez Torres
Keyword(s):  
Nitrogen Injection

Effect Analysis of Nitrogen Injection on the Variation of “Oxidation Zone” in Coal Mine Gob Based on Numerical Simulation

2016 ◽  
Vol 9 (1) ◽  
pp. 47-54
Author(s):  
Jing Shen ◽  
Mingran Chang
Keyword(s):  
Numerical Simulation ◽  
Coal Mine ◽  
Heat Dissipation ◽  
Spontaneous Combustion ◽  
Oxidation Zone ◽  
Effect Analysis ◽  
Mine Fire ◽  
Nitrogen Injection ◽  
The Difference ◽  
Residual Coal

One of the main reasons for coal mine fire is spontaneous combustion of residual coal in gob. As the difference of compaction degree of coal and rock, the underground gob can be considered as a porous medium and divided into “three zones” in accordance with the criteria. The “three zones” are “heat dissipation zone”, “oxidation zone” and “choking zone”, respectively. Temperature programming experiments are taken and numerical simulation with obtained experimental data is utilized to analyze the distribution of “three zones” in this paper. Different width and depth of “oxidation zone” are obtained when the inlet air velocity is changed. As the nitrogen injection has inhibition effect on spontaneous combustion of residual coal in gob, nitrogen is injected into the gob. The widths of “oxidation zone” are compared before and after nitrogen injection. And ultimately the optimum location and volume of nitrogen injection are found out.

Nitrogen Injection Into Stratified Gas-Condensate Reservoirs

1994 ◽  
Author(s):  
P.J. Sänger ◽  
H.K. Bjørnstad ◽  
Jacques Hagoort
Keyword(s):  
Gas Condensate ◽  
Gas Condensate Reservoirs ◽  
Nitrogen Injection

Successful Application of Concentric Casing Nitrogen Injection to Overcome Drilling Challenges and Deliver a Record Horizontal Well in the Tecominoacan Field

2013 ◽  
Author(s):  
Fernando Daniel Gonzalez ◽  
Roberto Franco ◽  
Reginaldo Rodriguez ◽  
Roberto Franco ◽  
Gustavo Gamez ◽  
...  
Keyword(s):  
Horizontal Well ◽  
Nitrogen Injection

scholarly journals The effect of liquid nitrogen cooling on coal cracking and mechanical properties

2018 ◽  
Vol 36 (6) ◽  
pp. 1609-1628 ◽  
Author(s):  
Chengzheng Cai ◽  
Feng Gao ◽  
Yugui Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Acoustic Emission ◽  
Liquid Nitrogen ◽  
Wave Velocity ◽  
Count Rate ◽  
Initial State ◽  
Nitrogen Injection ◽  
Strength Tests ◽  
Liquid Nitrogen Cooling

Liquid nitrogen is a type of super-cryogenic fluid, which can cause the reservoir temperature to decrease significantly and thereby induce formation rock damage and cracking when it is injected into the wellbore as fracturing fluid. An experimental set-up was designed to monitor the acoustic emission signals of coal during its contact with cryogenic liquid nitrogen. Ultrasonic and tensile strength tests were then performed to investigate the effect of liquid nitrogen cooling on coal cracking and the changes in mechanical properties thereof. The results showed that acoustic emission phenomena occurred immediately as the coal sample came into contact with liquid nitrogen. This indicated that evident damage and cracking were induced by liquid nitrogen cooling. During liquid nitrogen injection, the ring-down count rate was high, and the cumulative ring-down counts also increased rapidly. Both the ring-down count rate and the cumulative ring-down counts during liquid nitrogen injection were much greater than those in the post-injection period. Liquid nitrogen cooling caused the micro-fissures inside the coal to expand, leading to a decrease in wave velocity and the deterioration in mechanical strength. The wave velocity, which was measured as soon as the sample was removed from the liquid nitrogen (i.e. the wave velocity was recorded in the cooling state), decreased by 14.46% on average. As the cryogenic samples recovered to room temperature, this value increased to 18.69%. In tensile strength tests, the tensile strengths of samples in cooling and cool-treated states were (on average) 17.39 and 31.43% less than those in initial state. These indicated that both during the cooling and heating processes, damage and cracking were generated within these coal samples, resulting in the acoustic emission phenomenon as well as the decrease in wave velocity and tensile strength.

scholarly journals Suppression of Carbon Dust Formation by Nitrogen Injection into Hydrogen Plasmas in Detached Plasma Conditions

2010 ◽  
Vol 5 ◽  
pp. 004-004 ◽  
Author(s):  
Masaaki KYO ◽  
Yuji TAKEGUCHI ◽  
Yoshihiko UESUGI ◽  
Yasunori TANAKA ◽  
Suguru MASUZAKI
Keyword(s):  
Dust Formation ◽  
Nitrogen Injection ◽  
Hydrogen Plasmas
Sign in / Sign up

Export Citation Format

Share Document