The advanced dispersive type high temperature filtrate reducer used in oil well cement was synthesized with 2-acryloyl-2-methyl-propyl sulfonic (AMPS) , N, N-dimethylacrylamide (DMAA) and organic acids. When the mass fraction of synthetic filtrate reducer was 1%, the filter loss of the cement slurry was 30ml/30min at 120 °C and 49ml/30min at 150°C respectively, and the cement strength was 25MPa after 24 hours, and the rheological property of the cement slurry was well when the mass fraction of synthetic filtrate reducer was 2%, and liquidity factor was 0.85, and the consistency was 0.43. The results showed that the filtrate reducer had good dispersity and could control the fluid loss efficiently, and the ability of resistance to high temperature and salt resistance was good.

The paper analyzed the process of the microwave drill for rock, and established the theoretical analysis model and the system equations. And through the numerical simulation, the electric field intensity and the temperature of the top of the microwave generator increased with the increase of the depth that the conductor was inserted, and the thermal runaway effect was strengthened. So the microwave assisted rock breaking scheme with microwave near field energy and thermal runaway effect is feasible.

Microwave crag broken is a thermal assisted rock breaking method which could melt rocks. Microwave assisted rock breaking method will not bring new impact, wear and tear, instead, the microwave pretreatment on the rock reduces the difficulty of breaking rock and prolongs the service life of the drill bit. This microwave generator accumulates the microwave near the hot spot to soften and melt the rock through generating and transmitting the microwave. And we had experimented with the microwave generator to penetrate the wood, and weaken the strength of the rock. And the experiment proved the scheme of the microwave assisted rock breaking through microwave near field energy and the thermal runaway effect is feasible.

In carboniferous system of Dzungaria basin, the hard igneous rock greatly decreases the drilling velocity. Gas drilling is probably the only technology to overcome this problem. However, the applicability of gas drilling technology should be investigated first. It was studied by analyzing the rock strength both experimentally and theoretically. Stress status of many rock elements near well face was tested which showed a 2D compression status rather than 3D in conventional slurry drilling technology conditions. Therefore there was a horizontal stress for underground rocks, in a similar magnitude with upper burden pressure. The domination of the confining pressure, different with normal conditions, may mislead the selection of the failure criterion. We proved the correction of the Mohr-coulomb criterion as the most suitable failure criterion in gas drilling conditions. As a result, the applicability of gas drilling technology in Carboniferous system of Dzungaria basin was concluded.

The gas drilling mainly relies on the high speed air flow to carry the cuttings. The formation water or oil mixed with the cuttings and then stick together in clumps after the formation water or oil went into the hole annulus, the clumps stick on the drill string and the borehole. The clumps may block the hole annulus and cause the stick or bury the drill string and many other complex accident. It could stop the cuttings from sticking with the liquid through freezing the formation fluid with the liquid nitrogen. And the natural geotechnical becomes into the frozen soil, and forms the temporary solid which is intact, high strength and low-permeability. This technology could achieve the purpose of strengthening the formation and reducing the fluid flow of the formation, and it greatly broadens the scope of application of gas drilling.