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Calculation analysis of sustained casing pressure in gas wells 被引量:13
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作者 Zhu Hongjun Lin Yuanhua +2 位作者 Zeng Dezhi Zhang Deping Wang Feng 《Petroleum Science》 SCIE CAS CSCD 2012年第1期66-74,共9页
Sustained casing pressure (SCP) in gas wells brings a serious threat to worker safety and environmental protection. According to geological conditions, wellbore structure and cement data of gas wells in the Sichuan-... Sustained casing pressure (SCP) in gas wells brings a serious threat to worker safety and environmental protection. According to geological conditions, wellbore structure and cement data of gas wells in the Sichuan-Chongqing region, China, the position, time, environmental condition and the value of SCP have been analyzed. On this basis, the shape of the pressure bleed-down plot and pressure buildup plot were diagnosed and the mechanism of SCP has been clarified. Based on generalized annular Darcy percolation theory and gas-liquid two-phase fluid dynamics theory, a coupled mathematical model of gas migration in a cemented annulus with a mud column above the cement has been developed. The volume of gas migrated in the annulus and the value of SCP changing with time in a gas well in Sichuan have been calculated by this model. Calculation results coincided well with the actual field data, which provide some reference for the following security evaluation and solution measures of SCP. 展开更多
关键词 sustained casing pressure gas migration coupled mathematic model gas well
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Clinical study on the effect of abdominal cavity chemotherapy by hot perfusion and sustained low losmatic pressure on malignant ascites caused by gastrointestinal tumors
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作者 杨光 刘长安 《中国组织工程研究与临床康复》 CAS CSCD 2001年第18期152-,共2页
关键词 Clinical study on the effect of abdominal cavity chemotherapy by hot perfusion and sustained low losmatic pressure on malignant ascites caused by gastrointestinal tumors
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Evaluation of the injection and plugging ability of a novel epoxy resin in cement cracks
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作者 Guang-Yao Leng Wei Yan +6 位作者 Hai-Mu Ye Er-Dong Yao Ji-Bin Duan Zheng-Xian Xu Ke-Pei Li Jing-Ru Zhang Zhong Li 《Petroleum Science》 SCIE EI CAS CSCD 2024年第2期1211-1220,共10页
Sustained casing pressure(SCP)is a crucial issue in the oil and gas production lifecycle.Epoxy resins,exhibiting exceptional compressive strength,ductility,and shear bonding strength,have the potential to form reliabl... Sustained casing pressure(SCP)is a crucial issue in the oil and gas production lifecycle.Epoxy resins,exhibiting exceptional compressive strength,ductility,and shear bonding strength,have the potential to form reliable barriers.The injectivity and sealing capacity of the epoxy resin is crucial parameters for the success of shallow remediation operations.This study aimed to develop and assess a novel solid-free resin sealant as an alternative to Portland cement for mitigating fluid leakage.The investigation evaluated the viscosity,compressive strength,and brittleness index of the epoxy resin sealant,as well as its tangential and normal shear strengths in conjunction with casing steel.The flow characteristics and sealing abilities of conventional cement and epoxy resin were comparatively analyzed in cracks.The results showed that the application of a viscosity reducer facilitated control over the curing time of the epoxy resin,ranging from 1.5 to 6 h,and reduced the initial viscosity from 865.53 to 118.71 m Pa,s.The mechanical properties of the epoxy resin initially increased with a rise in curing agent content before experiencing a minor decrease.The epoxy resin containing 30%curing agent exhibited optimal mechanical properties.After a 14-day curing period,the epoxy resin's compressive strength reached81.37 MPa,2.12 times higher than that of cement,whereas the elastic modulus of cement was 2.99 times greater than that of the epoxy resin.The brittleness index of epoxy resin is only 3.42,demonstrating high flexibility and toughness.The tangential and normal shear strengths of the epoxy resin exceeded those of cement by 3.17 and 2.82 times,respectively.In a 0.5 mm-wide crack,the injection pressure of the epoxy resin remained below 0.075 MPa,indicating superior injection and flow capabilities.Conversely,the injection pressure of cement surged dramatically to 2.61 MPa within 5 min.The breakthrough pressure of0.5 PV epoxy resin reached 7.53 MPa,decreasing the crack's permeability to 0.02 D,a mere 9.49%of the permeability observed following cement plugging.Upon sealing a 2 mm-wide crack using epoxy resin,the maximum breakthrough pressure attained 5.47 MPa,3.48 times of cement.These results suggest that epoxy resin sealant can be employed safely and effectively to seal cracks in the cement. 展开更多
关键词 sustained casing pressure Epoxy resin sealant Curing agent Viscosity reducer Mechanical properties Crack sealing
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Maintaining Pressure on Sustainable Development
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作者 Alphonce Shiundu 《ChinAfrica》 2012年第8期22-23,共2页
THE impression one gets after reading the 53-page resolution of the United Nations Summit on Sustainable Development, bet- ter known as Rio+20, is that all those who compiled the document know what the so called "pl... THE impression one gets after reading the 53-page resolution of the United Nations Summit on Sustainable Development, bet- ter known as Rio+20, is that all those who compiled the document know what the so called "planet-in-peril" needs to cure its problems. 展开更多
关键词 Maintaining pressure on Sustainable Development
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Research on the Regional Ecological Environment Evaluation and Application under the Influence of the Severe Earthquake Disaster
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作者 FU Fei YANG Qiaoyan ZHANG Shuaijun 《Journal of Landscape Research》 2014年第6期29-33,38,共6页
To conduct the ecological restoration and reconstruction of disaster areas after the severe earthquake, such as Wenchuan Earthquake and Lushan Earthquake, this article uses region al ecological environment evaluation ... To conduct the ecological restoration and reconstruction of disaster areas after the severe earthquake, such as Wenchuan Earthquake and Lushan Earthquake, this article uses region al ecological environment evaluation and ecological footprint to construct a quantitative analysis model on the basis of ecololgical environment indexes in Mianzhu City. Through this model, resource status of the regional environment in Mianzhu is analyzed, as well as the ecological capacity and the ecological security. Based on the evaluation and analysis, this paper provides multi-path development strategies of ecological restoration and sustainable development of human settlements after the earthquake. 展开更多
关键词 Severe earthquake disaster Regional ecological environment evaluation Ecological footprint Ecological pressure and sustainable development of human settlements Ecological construction strategy
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