Study and application of skid-mounted small-diameter CT water-discharging and gas-producing unit;

The gas lifts is one of the most important drainage gas recovery technique.

Flowing bottomhole pressure(FBHP) on drainage gas recovery wells is obtained by calculating bottomhole pressure of pumping wells at home and abroad.

Calculation and analysis on efficiency of dewatering gas production system by pig gas-lift;

With petroleum development entering the later stage and increasing water production wells, the dewatering gas production technique has become an important means to reach the steady production in Chuanyu gasfield.

This paper elaborates the operating principle of the ESP and points out the application scope of the ESP in dewatering gas production as well as its features .

Aiming to the water producing situation in Weicheng gas field,this paper introduced the working principle,working require and testing results of the technique of gas recovery by water drainage.

Based on the minimum flow rate theory of unloading for gas wells, the improved Tuener model is applied to form a set of methods to optimize the foaming agents for gas recovery by water drainage with foam.

Among the common techniques of gas recovery by water drainage , the technique of gas recovery by water drainage with optimized tubing string is widely used at home because it is featured by simple operation and less cost.

The solving measures for exhaust problem are listed,and the combined exhaust device using safety valve is put forward to solve this problem.

This paper theoretically demonstrates the law that the efficiency of a pumping system increrases along with the inceasing of pump capacity, and presents and demonstrates a kind of method to fix the largest pump capacity under the condition of no cavitation happening to the pump and a kind of method to fix the largest pump capacity under the condition of no overload happening to the motor.

The traditional method and methods developed in recent years of mine pumping system design and equipment selection are analysed and the defects of them are put forword in this paper.

This paper analyses the problems in selecting mine suction pipe when the tradational method of mine pumping system design and equipment selection is used.