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During short term, as the relationship between safety proof level and output, enterprise safety-working situation is related with coal price, variable cost, accident compensate and regulation level.
短期内，由于企业预防水平与产量的相关性，企业的安全生产状况将和煤炭价格、企业的各种变动成本、事故赔偿标准以及安全监管水平有关。
A cementing method of separable setting and variable density is used, with two level controls of safety valve on the ground and downhole;
采用双凝固井、变密度固井方式，均采用地面和地下两级安全阀控制；
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