Research On Anti-blocking Technology For Production Of High-sulfur Gas Wells

The development of high-sulfur gas well has been used for several decades in our country, but the research on the development of such special gas well is not enough.The dissolution mechanism of sulfur in natural gas, the deposition, plugging and migration mechanism of sulfur in formation and wellbore are far behind abroad,Resulting in the production of the column is prone to hydrate and sulfur deposition blockage.Thus, for the production of high-technology research attempts to prevent the string sour gas wells it is extremely important paper analyzes the gas hydrate production and sulfur deposition mechanism and both conditions, so research prevention measures.The dynamic characteristics, reservoir characteristics and composition of plugging components of high sulfur gas wells were analyzed, And the gas-producing channel is found to be blocked by gas hydrate. The influence of hydrogen sulfide on hydrate formation was analyzed by analyzing the mechanism of hydrate formation. The critical temperature, the critical pressure and the formation position in the wellbore were predicted, and the hydrate inhibitor type was calculated and the hydrate formation Inhibitor dosage, and finally found a reasonable hydrate inhibitor filling system.The basic properties of sulfur and sulfide and the deposition mechanism of sulfur in high sulfur bearing gas well are analyzed. Combined with the thermodynamic model for predicting the sulfur solubility, a prediction model of sulfur precipitation in high sulfur gas wells is established. The sulfur precipitation and deposition in the production column are predicted. The critical flow rate and the critical yield were calculated, and a variety of sulfur deposition prevention methods were determined.This paper summarizes the prevention measures of the production string in high sulfur gas wells, which provides theoretical basis and technical support for gas wells to prevent plugging and plugging.So,this paper is of great guiding significance for similar gas wells.