运用保角变换和等值渗流阻力推得分支水平井（有公共点或没有公共点）产能公式。
The productivity formulas of branch horizontal wells which have or not have common joint are derived by applying conformal transformation and isopleth map of percolation resistance force.
采用化学清洗和空气爆破相结合的方法，清除换热器中由变换气及催化剂粉末等形成的垢物，降低换热器的阻力，提高热效。
Combining the chemical cleaning and air blasting method, this paper introduces a new method of removing the deposit resulting from the shift gas and catalyst powder, etc.
并基于保角变换数学方法和等值渗流阻力原理，直接推导气藏水平井层流产能方程。
Meanwhile, the paper directly derives the laminar flow productivity functions of gas horizontal Wells which based on the theory of equivalent porous flow and the math method of baojiao transform.
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