The gathering system of Luojiazhai high-sulfur gas reservoir is affected by sulfur accumulation,the inter-lock alarm is frequently triggered by the gas well pressure after the secondary throttling.To avoid the interlocking shut-in,the production can only be maintained by means of pressure reduction.By analyzing the relationship be-tween average daily gas production and sulfur accumulation of single well during the phase,it is found that as the ratio of gas production per well increased,the sulfur accumulation also shows an increasing trend.In order to ex-tend the continuous production cycle of single well and reduce the sulfur accumulation and its impact on the gather-ing system,the traditional production proration method currently used can no longer meet the production require-ments.To obtain the optimal stable production period of gas reservoirs,this paper starts from various factors affect-ing production proration of single well,and establishes a nonlinear mathematical model with the optimal stable pro-duction period as the objective function through node analysis.Taking into account constraints such as gas well pro-ductivity,critical sulfur-carrying production,maximum production limit of safety valve after throttling,and maxi-mum production corresponding to interlocking pressure after secondary throttling,the single well production prora-tion corresponding to the optimal stable production period is obtained by iterative computation based on differential calculus.According to the optimal production proration plan,production adjustments were made to 6 production wells.After the secondary throttling,the average pressure drop of single wells is about 0.3 MPa,the average stable production days increased from 106 d to 201d,and the sulfur accumulation in gathering system decreased by 121 kg.The method effectively guides the production of gas wells and also provides reference significance for optimizing production allocation in similar gas fields.
high sulfur gas reservoirsulfur accumulationnodal analysisnonlinear optimizationproduction pro-ration of single well
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