Utilization Status, Prospects and Feasibility about Gas Hydrocarbon Hydrate as Replaceable Resources;

This paper introduces the general situation of Daniudi Gas field of Erdos and its gas gathering technique, and advances some measures for preventing the formation of gas hydrate.

After analytical research on plugging during the gath- ering and transferring process for gas wells in Yulin gas field,natural gas is found to easily become hydrates under high pressure and low temperature,resulting in the plug- ging of surface pipelines.

Preventing the Formation of Hydrates with Active Agent;

Microstructure analysis on Friedel s salt in hydrate of cement and GGBS;

Hydrates and Paste Structure of the Cementing Material with High Proportion of Sea-Discharged Ash;

XRD and SEM analysis were used to study the hydrates.

Effect of water-binder ratio and composition on the hydration products and hydration degree of complex shrinkage-compensating binders;

The mechanical property was tested,and the hydration product was studied by the testing method of XRD,SEM and MIP.

By experiment methods of DTA,XRD,SEM and MIP,the influence of the ferrite on the hydration products of barium-bearing calcium sulfo-aluminate was studied.

The hydration products,microstructure and strength of slag-fly ash mixed cementitious materials were measured and ana-lyzed by X-ray diffraction and scanning electron microscopy.

In both of the pure cement system and the mixed system of activated Xuzhou coal-gangue and cement,hydration products at different curing age as well as the hydration heat and the kinetics process of the hydration reactor were studied.

Mechanical performances of the composite cement have been tested and the techniques of x-ray diffraction and scanning electron microscope have been employed to analyze the hydration products.