Thinking on Problems of Ice Blockage During Gas Well Opening in Sulige Gas Field

Aiming at the problem of ice blockage which leads to well opening failure using needle valve during gas wells opening procedure of some high-pressure gas wells in Sulige gas field, the reasons are analyzed and solutions are proposed in this paper. Firstly, gas collection pattern of medium and low pressure in Sulige gas field is introduced in this paper, and then the needle valve of wellhead is equivalently simplified and simulation analysis is implemented by using the software of FLUENT. The results of the simulation show that the pressure and temperature during gas well opening in Sulige gas field could match the formation conditions of gas hydrate. Meanwhile, through mechanism analysis on the wellhead equipment and field testing, flow channel of the wellhead flowmeter is proved to be the main region where ice blockage occurred. Based on the result of the above analysis, three solutions are put forward innovatively in this paper and one of them is mainly recommended. The problems of well opening failure are hopeful to be solved through the solutions in this paper, and the success rate of gas well opening in Sulige gas field could be improved.