Aiming at acute characteristics of flammability,explosibility,causticity and leakiness of high sour natural gas,giving full consideration to local natural conditions in Sichuan Province and starting with purification ...Aiming at acute characteristics of flammability,explosibility,causticity and leakiness of high sour natural gas,giving full consideration to local natural conditions in Sichuan Province and starting with purification process,the paper analyzed process configurations,energy utilization and conservation,safety and environment protection measures. The integrated technology and engineering scheme for high sour natural gas purification was established and successfully used in industrial application.展开更多
The desulfurization performance of the UDS solvents was investigated at an industrial side-stream plant and was compared with that of MDEA solvent.A mass transfer performance model was employed for explaining the COS ...The desulfurization performance of the UDS solvents was investigated at an industrial side-stream plant and was compared with that of MDEA solvent.A mass transfer performance model was employed for explaining the COS absorption into different solvents.Meanwhile,the regeneration performance of the UDS solvents was evaluated in side-stream tests.Results indicate that under the conditions covering an absorption temperature of 40℃,a pressure of 8.0 MPa,and a gas to liquid volume ratio(V/L)of around 230,the H2S content in purified gas can be reduced to 4.2 mg/m3 and 0 by using solvents UDS-II and UDS-III,respectively.Moreover,the total sulfur content in both purified gases is less than 80 mg/m3.As a result,the UDS-III solvent shows by 30 percentage points higher in COS removal efficiency than MDEA.In addition,the total volume mass transfer coefficient of UDS solvent is found to be twice higher than that of MDEA.Furthermore,the UDS solvents exhibit satisfactory thermal stability and regeneration performance.展开更多
In high sour gas reservoir drilling process, it happens occasionally that high-strength drill pipe suffers brittle fracture failure due to stress corrosion cracking, and poses serious hazard to drilling safety. To sol...In high sour gas reservoir drilling process, it happens occasionally that high-strength drill pipe suffers brittle fracture failure due to stress corrosion cracking, and poses serious hazard to drilling safety. To solve this problem, this paper studied the stress corrosion cracking mechanism and infl uencing factors of highstrength drill pipe in sour environment with hydrogen permeation experiments and tensile tests. We simulated practical conditions in laboratory and evaluated the stress corrosion cracking performance of the high-strength drill pipe under conditions of high stress level. For the problems occurring in use of high-strength drill pipe on site, the paper proposed a technical measure for slower stress corrosion cracking.展开更多
Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the...Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the Batang—Lijiang and Ailao Shan—Red River strike\|slip systems. Although several models were proposed to interpret their petrogenesis (Deng, 1989; Arnaud et al., 1991; Turner et al., 1996; Yin et al., 1995; Miller et al., 1999), their origin still remains hotly debated. Moreover, the published results were only focused on the high\|K igneous rocks resulted from partial melting of an enriched lithospheric mantle. Here, we present the detailed documents to testify the existence of a new kind of high\|K igneous rocks in eastern Tibet.Our new 39 Ar/ 40 Ar age data (Wang et al., 1999) and published age data for high\|K rocks in eastern Tibet show two distinctive magmatic episodes: one between 42Ma and 24Ma, and the other since ca.16Ma. They correspond to two types of high\|K magmatism in eastern Tibet. We name the older and younger groups as types Ⅰ and Ⅱ, respectively.展开更多
The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel（C110 steel） were investigated. The studied casing specimens are as follows： original casing, plastic deformation（PD）...The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel（C110 steel） were investigated. The studied casing specimens are as follows： original casing, plastic deformation（PD） casing and PD casing after being immersed in NACE A solution saturated with H2S（PD＋H2S）. Instrumented impact method was employed to evaluate the impact behaviors of the specimens, meanwhile, dynamic fracture toughness（JId） was calculated by using Rice model and Schindler model. The experimental results show that dynamic fracture toughness of the casing decreases after plastic deformation. Compared with that of the original casing and PD casing, the dynamic fracture toughness decreases further when the PD casing immersed in H2 S, moreover, there are ridge-shaped feature and many secondary cracks present on the fracture surface of the specimens. Impact fracture mechanism of the casing is proposed as follows： the plastic deformation results in the increase of defect density of materials where the atomic hydrogen can accumulate in reversible or irreversible traps and even recombine to form molecular hydrogen, subsequently, the casing material toughness decreases greatly.展开更多
为探究洛阳传统特色食品浆面条核心元素绿豆酸浆的细菌群落组成,利用Illumina MiSeq高通量测序技术对洛阳6家浆坊的绿豆酸浆进行细菌16S r DNA测序。结果表明:从6个绿豆酸浆样本中共鉴定出8个细菌门,涉及75个属和106个种;其中厚壁菌门...为探究洛阳传统特色食品浆面条核心元素绿豆酸浆的细菌群落组成,利用Illumina MiSeq高通量测序技术对洛阳6家浆坊的绿豆酸浆进行细菌16S r DNA测序。结果表明:从6个绿豆酸浆样本中共鉴定出8个细菌门,涉及75个属和106个种;其中厚壁菌门为优势菌门(占比78.57~97.17%),乳杆菌属(占比20.95%~90.36%)和乳球菌属(占比3.26%~62.68%)为优势菌属,寡发酵乳杆菌、未分类乳球菌属是对应的优势菌种,而植物乳杆菌、弯曲乳杆菌、食木薯乳杆菌等是常见的次优势菌种;这些优势细菌均为乳酸菌,具有广泛益生作用。对绿豆酸浆中细菌群落进行功能预测,发现细菌群落的碳水化合物代谢和氨基酸代谢丰度高,特别是呈味氨基酸代谢通路和L-乳酸脱氢酶丰度均较高,推断绿豆酸浆独特的酸香味与细菌的氨基酸代谢以及乳酸合成有关。本研究结果为进一步研究绿豆酸浆发酵机理及开发相应发酵剂奠定了理论基础。展开更多
文摘Aiming at acute characteristics of flammability,explosibility,causticity and leakiness of high sour natural gas,giving full consideration to local natural conditions in Sichuan Province and starting with purification process,the paper analyzed process configurations,energy utilization and conservation,safety and environment protection measures. The integrated technology and engineering scheme for high sour natural gas purification was established and successfully used in industrial application.
基金financial support from the National Key Science and Technology Project of China (2011ZX05017-005)the Fundamental Research Funds for the Central Universities (No.22A201514010)
文摘The desulfurization performance of the UDS solvents was investigated at an industrial side-stream plant and was compared with that of MDEA solvent.A mass transfer performance model was employed for explaining the COS absorption into different solvents.Meanwhile,the regeneration performance of the UDS solvents was evaluated in side-stream tests.Results indicate that under the conditions covering an absorption temperature of 40℃,a pressure of 8.0 MPa,and a gas to liquid volume ratio(V/L)of around 230,the H2S content in purified gas can be reduced to 4.2 mg/m3 and 0 by using solvents UDS-II and UDS-III,respectively.Moreover,the total sulfur content in both purified gases is less than 80 mg/m3.As a result,the UDS-III solvent shows by 30 percentage points higher in COS removal efficiency than MDEA.In addition,the total volume mass transfer coefficient of UDS solvent is found to be twice higher than that of MDEA.Furthermore,the UDS solvents exhibit satisfactory thermal stability and regeneration performance.
基金Funded by the Program for National Science Fund for Distinguished Young Scholars of China(No.51125019)the National Natural Science Foundation of China(Nos.50904050,51244007)+2 种基金the Basic Projects of Sichuan Province(2011JY0106)the Department of Education Science and Technology Innovation Team Program of Sichuan Province(13TD0026)the Sichuan Distinguished Youth Fund(2013JQ0037)
文摘In high sour gas reservoir drilling process, it happens occasionally that high-strength drill pipe suffers brittle fracture failure due to stress corrosion cracking, and poses serious hazard to drilling safety. To solve this problem, this paper studied the stress corrosion cracking mechanism and infl uencing factors of highstrength drill pipe in sour environment with hydrogen permeation experiments and tensile tests. We simulated practical conditions in laboratory and evaluated the stress corrosion cracking performance of the high-strength drill pipe under conditions of high stress level. For the problems occurring in use of high-strength drill pipe on site, the paper proposed a technical measure for slower stress corrosion cracking.
文摘Cenozoic high\|K igneous rocks are widely distributed in eastern Tibet. These rocks are exposed as flows, dykes and small intrusions along a narrow north\|south trending zone, which follows Tertiary fold belts and the Batang—Lijiang and Ailao Shan—Red River strike\|slip systems. Although several models were proposed to interpret their petrogenesis (Deng, 1989; Arnaud et al., 1991; Turner et al., 1996; Yin et al., 1995; Miller et al., 1999), their origin still remains hotly debated. Moreover, the published results were only focused on the high\|K igneous rocks resulted from partial melting of an enriched lithospheric mantle. Here, we present the detailed documents to testify the existence of a new kind of high\|K igneous rocks in eastern Tibet.Our new 39 Ar/ 40 Ar age data (Wang et al., 1999) and published age data for high\|K rocks in eastern Tibet show two distinctive magmatic episodes: one between 42Ma and 24Ma, and the other since ca.16Ma. They correspond to two types of high\|K magmatism in eastern Tibet. We name the older and younger groups as types Ⅰ and Ⅱ, respectively.
基金Funded by the Construction of Key Disciplines for Young Teacher Science Foundation of the Southwest Petroleum University(No.P209)the Research Fund for the Doctoral Program of Higher Education(No.20105121120002)the National Natural Science Foundation of China(Nos.51004084 and 51374177)
文摘The effects of plastic deformation and H2 S on fracture toughness of high strength casing steel（C110 steel） were investigated. The studied casing specimens are as follows： original casing, plastic deformation（PD） casing and PD casing after being immersed in NACE A solution saturated with H2S（PD＋H2S）. Instrumented impact method was employed to evaluate the impact behaviors of the specimens, meanwhile, dynamic fracture toughness（JId） was calculated by using Rice model and Schindler model. The experimental results show that dynamic fracture toughness of the casing decreases after plastic deformation. Compared with that of the original casing and PD casing, the dynamic fracture toughness decreases further when the PD casing immersed in H2 S, moreover, there are ridge-shaped feature and many secondary cracks present on the fracture surface of the specimens. Impact fracture mechanism of the casing is proposed as follows： the plastic deformation results in the increase of defect density of materials where the atomic hydrogen can accumulate in reversible or irreversible traps and even recombine to form molecular hydrogen, subsequently, the casing material toughness decreases greatly.
文摘为探究洛阳传统特色食品浆面条核心元素绿豆酸浆的细菌群落组成,利用Illumina MiSeq高通量测序技术对洛阳6家浆坊的绿豆酸浆进行细菌16S r DNA测序。结果表明:从6个绿豆酸浆样本中共鉴定出8个细菌门,涉及75个属和106个种;其中厚壁菌门为优势菌门(占比78.57~97.17%),乳杆菌属(占比20.95%~90.36%)和乳球菌属(占比3.26%~62.68%)为优势菌属,寡发酵乳杆菌、未分类乳球菌属是对应的优势菌种,而植物乳杆菌、弯曲乳杆菌、食木薯乳杆菌等是常见的次优势菌种;这些优势细菌均为乳酸菌,具有广泛益生作用。对绿豆酸浆中细菌群落进行功能预测,发现细菌群落的碳水化合物代谢和氨基酸代谢丰度高,特别是呈味氨基酸代谢通路和L-乳酸脱氢酶丰度均较高,推断绿豆酸浆独特的酸香味与细菌的氨基酸代谢以及乳酸合成有关。本研究结果为进一步研究绿豆酸浆发酵机理及开发相应发酵剂奠定了理论基础。
