Structural Parameter Optimization and Field Test of a Jetting and Helical Combination Drain Tool

In order to reduce the pressure drop of production fluid in the wellbore and make full use of the energy of gas wells with fluid accumulation for low-cost drainage and gas recovery, a jetting and helical combination drain tool was developed. Based on the design of the tool structure, the performance test system of the tool was built.The simulated wellbore pressure drops at different gas flow rates with different structural parameters were tested, and the single factor analysis and orthogonal test analysis of the structural parameters of the tool were carried out. In addition, the optimal structural parameter combinations of the tool at different conditions were obtained. The results show that the main structural parameters of the tool affect the pressure drop of the fluid in the wellbore. Moreover, gas wells with different production rate require tools with different structural parameter combinations to minimize the wellbore pressure drop. After the optimized tool was run in Well A, the cumulative gas production increased by an average of 20.95%, and the cumulative water production increased by an average of 21.59% over a same production period. The drainage stimulation effect of the tool was demonstrated. The successful application of this tool provides a new technical method for low-cost drainage and gas recovery in gas wells with fluid accumulation.