Abstract:The compound insulation pressure-resistant housing for deep drilling is designed mainly to solve the problem with the survey tool in extremely heat temperature high pressure environment. The mission target is to overrun extremely high pressure environment to descend vacuum unique hot heat preservation， high the water pressure seal completely analysis to correct etc. design key technique， develop to submit to have independence intelligent property right of the big depth separate hot compound the heat preservation accept to press tube， use the environment temperature can reach to 260 ℃ ， the environment pressure 130 MPa， keep vacuum unique hot the 8 h in the thermos bottle<80℃， pass the engineering Application in the subterranean heat the ability drill explore， dry heat rock drill explore， science drill explore， deeply the department the mineral resources investigate explore and deeply the department the oil the spirit the resources investigate explore etc. expand application realm， further promote instrument function index sign. Accept to press outside tube and thermos bottle carried on heat high pressure to experiment，Experiment result enunciation accept to press outside tube heat high pressure environment bottom work is credibility，The heat preservation ability of the thermos bottle as well the ability attain a technique a request，Certificate should design method is reasonable.

Abstract:Lost circulation often happens during drilling process, which is not only a severe trouble for safe drilling, but also leads to more complex problems to seriously restrict the exploration and development of oil field. The decision method of leakage zone and the stimulation evaluation on plugging agent formula are introduced in the paper. For formation leakage, the lost circulation zone should be located first, and then the evaluation is made on the plugging agent formulas to decide an ideal formula and the corresponding plugging plan. The success rate of plugging can be increased by this way.