MATHEMATICAL AND COMPUTER SIMULATION TECHNOLOGY OF CONDENSATE OIL AND GAS WELLS STIMULATED BY ELECTROMAGNETIC HEATING

In this article, the recent research achievements on the theory and technology of condensate oil and gas wells stimulated by electromagnetic induction heating during middle or late exploitation period were introduced for the first time at home and abroad. A new kind of electromagnetic wave induction heating equipment XAEMH-1 was developed. Taking near wellbore zone temperature field as the main research object, which is the key factor for the condensation and retrograde vaporization during electromagnetic heating, the mathematical simulation model for a condensate oil and gas well stimulated by electromagnetic heating to eliminate blockage near wellbore region was established. A corresponding computer system was developed to dynamically predict and evaluate the efficiency of this electromagnetic heating process. Through this computer system, the near wellbore region distributions of several important factors such as temperature, pressure, condensate oil saturation and relative permeability can be described quantitatively. A condensate gas well in a late exploitation period reservoir here in China was chosen as a practical example to test the effectiveness of this new technology and some satisfactory results were obtained. These results proved that it is feasible to eliminate the near wellbore region blockage by electromagnetic heating. A new prospective stimulation method was given for the condensate oil and gas reservoirs during middle or late exploitation period.

Role of transient receptor potential vanilloid subetype 1 in the increase of thermal pain threshold by moxibustion

OBTECTIVE:To explore the role of transient receptor potential vaniiloid subetype 1(TRPV1) in the increase of the thermal pain threshold by moxibustion.METHODS:Forty Kunming mice(20 ± 2) g were randomized into control group,capsaicin group,capsazepine group,moxibustion group and moxibustion + capsazepine(MC) group with 8 mice in each,and 16 C57BL/6 wild-type mice(18 ± 2) g were randomized into wild-type(WT) control group and WT moxibustion group with 8 mice in each,and 14 TRPV1 knockout mice(18 ± 2) g were randomized into knockout(KO) control group and KO moxibustion group with 7 in each.Each mouse in the capsaicin group was subcutaneously injected with the amount of 0.1 mL/10 g into L5 and L6 spinal cords;each mouse in the capsazepine group was intraperitoneally injected with the amount of0.1 mL/10 g.Similarly,each mouse in the moxibustion group was given a suspended moxibustion with specially-made moxa-stick for 20 min on L5 and L6 spinal cords.Each mouse in MC group was intraperitoneally injected with the amount of 0.1 mL/10 g first,then after 15 min was given a suspended moxibustion for 20 min on L5 and L6 spinal cords.Each mouse in WT moxibustion group and KO moxibustion group was given a suspended moxibustion with specially-made moxa-stick for 20 min on L5 and L6 spinal cords.The control group,WT control group and KO control group were of no treatment in any way.After all treatments were completed,the digital-display measurement instrument for thermal pain was used to measure the threshold of thermal pain in each group respectively.RESULTS:Compared with the control group,the thresholds of thermal pain in the moxibustion group and MC group were significantly increased(P <0.01);no significant changes in the thresholds in the capsaicin group and the capsazepine group(P > 0.05);compared with moxibustion group,he threshold of thermal in MC group was obviously decreased(P < 0.01).Compared with WT control group,the threshold of thermal pain in WT moxibustion group was significantly increased(P <0.01);compared with KO control group,no changes in the threshold in KO moxibustion group(P > 0.05).CONCLUSION:TRPV1 participated in the process of increasing the threshold of thermal pain by stimulating L5 and L6 of mice spinal cord with burning mosa-stick.

Optically stimulated luminescence(OSL) of LiMgPO4：Tm,Tb phosphor

LiMgPO4：Tm,Tb phosphors were synthesized using a solid-state diffusion method. Their properties were investigated using X-ray diffraction（XRD）, thermoluminescence（TL）, scanning electron microscopy（SEM）, and OSL dosimetric techniques. The influence of light stimulation and thermal excitation on the TL and OSL, and the reusability of the phosphors for OSL regenaration were also studied. The LiMgPO4：Tm,Tb phosphor exhibited high sensitivity to ionizing radiation, good signal reusability and a broad linear dose response range（0.1–1000 Gy）. Fading of the OSL signal was about 16% in eight days, after that the intensity kept stable. The excellent luminescent and dosimetric properties of these LiMgPO4：Tm,Tb phosphors enable them to be promising candidates in radiation dosimetry.