Abstract: Disclosed herein are methods for testing wettability of tight oil reservoir. The method comprises: by using a nuclear magnetic resonance testing method, testing nuclear magnetic resonance maps of the tight oil reservoir in the saturated water state and in the saturated oil state; by using the nuclear magnetic resonance maps, analyzing a water-wetting degree and an oil-wetting degree of the tight oil reservoir; calculating a mixed wettability index of the tight oil reservoir, and estimating the wettability of the tight oil reservoir according to the mixed wettability index. This disclosure can effectively improve testing efficiency, quantitatively analyze the water-wetting degree and the oil-wetting degree of the tight oil reservoir, and improve accuracy of testing results.

Abstract: The present disclosure discloses a core holding system, comprising: a sleeve in which a cavity capable of accommodating a core is formed; an adjustment plug set comprising a plurality of adjustment plugs having grooves of different diameters, wherein any one of the adjustment plugs is dismountably connectable to the sleeve, and when the adjustment plug is mounted on the sleeve, an end of the adjustment plug having the groove is insertable into the sleeve while abutting against the core; a heating module provided to sheathe the sleeve; and a thermal insulation module provided to sheathe the heating module.

Abstract: The present disclosure discloses a core holding system, comprising: a sleeve in which a cavity capable of accommodating a core is formed; an adjustment plug set comprising a plurality of adjustment plugs having grooves of different diameters, wherein any one of the adjustment plugs is dismountably connectable to the sleeve, and when the adjustment plug is mounted on the sleeve, an end of the adjustment plug having the groove is insertable into the sleeve while abutting against the core; a heating module provided to sheathe the sleeve; and a thermal insulation module provided to sheathe the heating module.

Abstract: Disclosed herein are methods for testing wettability of dense oil reservoir. The method comprises: by using a nuclear magnetic resonance testing method, testing nuclear magnetic resonance maps of the dense oil reservoir in the saturated water state and in the saturated oil state; by using the nuclear magnetic resonance maps, analyzing a water-wetting degree and an oil-wetting degree of the dense oil reservoir; calculating a mixed wettability index of the dense oil reservoir, and estimating the wettability of the dense oil reservoir according to the mixed wettability index. This disclosure can effectively improve testing efficiency, quantitatively analyze the water-wetting degree and the oil-wetting degree of the dense oil reservoir, and improve accuracy of testing results.

Abstract: A high intensity discharge lamp has an arc tube, which is filled with substances for gas discharge. The arc tube includes a bulbous portion. Surrounding the arc tube there is a tubular envelope. The envelope has an enlarged portion, which is similar to the bulbous portion. The distance between the envelope and the outer wall of the arc tube is uniform thereby resulting in uniform temperature distribution on the wall of the arc tube, improved thermal stability, improved luminous and electrical parameters. The lamp reduces the light refraction which occurs between the inner surface of the envelope and the outer surface of the arc tube and also between the two interface of the envelope wall thereby emitting more light and reducing the occurrence of glare.

Abstract: The present invention disclosed a high-intensity discharge lamp without or with low mercury, including the metallic halide discharge lamp, the high pressure mercury lamp and the mercury-xenon lamp and so on. When the high-intensity discharge lamp without or with low mercury according to the invention is used, the optimum amount of Se or HgSe is determined based on the type and the power of the lamps to substitute for the mercury partially or completely. Thus a proper light spectrum can be reached with a high color rendering index (for example 95). The mercury packed in the high-intensity discharge lamp without or with low mercury according to the invention can be substituted completely or reduced greatly. The lamp meets the requirement of the environmental protection and is a potential new-style light source.

Abstract: The invention provides a high intensity discharge lamp with a lamp cap, which has a simple and firm structure, higher thermal stability, lower glare and higher efficiency. The discharge lamp comprises an arc tube, which is filled with substances for gas discharge. The arc tube comprises a bulbous or ellipsoidal portion. Surrounding the arc tube is a tubular envelope; the envelope has an enlarged portion, which is similar to the bulbous or ellipsoidal portion disposed of the bulbous portion of the arc tube. The distance between the envelope and the outer wall of the arc tube is uniform; it makes the temperature distribution on the wall of arc tube more uniform, then the thermal stability, the luminous and electricity parameters of the lamp are improved.