Cause Analysis and Preventive Measures for Sand Production in Gas Wells of Sulige Gas Field
Yunfan Wen, Liu Lili, Yulu Huang, Huihui Liu, Mingyue Sui
Abstract
Sand production from gas wells has a significant impact on the production of gas wells. This review aims to reveal the reasons for fracturing sand backflow in Sulige Gas Field gas wells and provide targeted preventive measures to prevent fracturing sand backflow. The critical parameters of sand production in gas wells were calculated through theoretical models, and the reasons and mechanisms of fracturing sand backflow in Sulige gas wells were analyzed from three major aspects: production factors, reservoir factors, and process factors. The Analytic Hierarchy Process was used to analyze the degree of influence of the sand production factors in gas wells. Research has shown that the high production rate of gas wells, unreasonable design of fracturing parameters, and insufficient drainage of fracturing fluid are the main reasons for sand discharge in the Sulige gas well formation. Controlling the production of gas wells between the critical flow rate of fracturing proppant reflux and the critical sand carrying flow rate of the wellbore, designing fracturing construction parameters reasonably, prolonging the gas testing time, and allowing the fracturing fluid to fully reverse flow can effectively prevent sand production from the gas well.