罗家寨高含硫气藏基于稳产的优化配产方法  

Optimized Proration Plan Based on Stable Production in Luojiazhai High-sulfur Gas Reservoir

作　　者：兰云霞 贾长青 廖华伟 张俊良[1] 薛江堂 张强 李翔[1] Lan Yunxia;Jia Changqing;Liao Huawei;Zhang Junliang;Xue Jiangtang;Zhang Qiang;Li Xiang(PetroChina Southwest Oil&Gas field Company,Dazhou,Sichuan 636450,China)

机构地区：[1]中国石油西南油气田分公司,四川达州636450

出　　处：《特种油气藏》2024年第3期143-149,共7页Special Oil & Gas Reservoirs

基　　金：中国石油西南油气田分公司2021年科研计划项目“罗家寨气田地面集输系统硫沉积预测及气井优化运行研究”(2021030322)。

摘　　要：罗家寨高含硫气藏集输系统受硫沉积影响,气井二级节流后压力频繁触发联锁报警,为避免气井联锁关井,只能通过压产降压方式维持生产。通过分析阶段单井日均产气量与硫沉积量发现,随着单井配产比的增大,阶段硫沉积量也呈增加趋势。为了提高单井连续生产周期,降低集输系统硫沉积量及其影响程度,目前采用的传统产能配产法已无法满足矿场生产要求。因此,为了获得气藏最优稳产期,从影响单井配产的各项因素出发,通过节点分析,建立以最优稳产期为目标函数的非线性数学模型,综合考虑气井产能、临界携硫产量、节流后安全阀限定最大产量、二级节流后联锁压力对应最大产量等约束条件,采用基于微分的搜索方法迭代计算,得到最优稳产期对应的单井配产。按照最优配产方案对6口生产井实施了产量调整,单井二级节流后压力平均下降约0.3 MPa,平均稳产天数由106 d提高至201 d,集输系统阶段硫沉积量减少121 kg,有效指导了气井生产,同时可为相似的已开发高含硫气田的优化配产提供借鉴。The gathering system of Luojiazhai high-sulfur gas reservoir is affected by sulfur accumulation,the interlock 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 between 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 extend the continuous production cycle of single well and reduce the sulfur accumulation and its impact on the gathering system,the traditional production proration method currently used can no longer meet the production requirements.To obtain the optimal stable production period of gas reservoirs,this paper starts from various factors affecting production proration of single well,and establishes a nonlinear mathematical model with the optimal stable production period as the objective function through node analysis.Taking into account constraints such as gas well productivity,critical sulfur-carrying production,maximum production limit of safety valve after throttling,and maximum production corresponding to interlocking pressure after secondary throttling,the single well production proration 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.

关 键 词：高含硫气藏 硫沉积 节点分析 非线性优化 单井配产 

分 类 号：TE341[石油与天然气工程—油气田开发工程]