礁滩相气藏气井早期水侵识别方法优选及应用  

Optimization and Application of Identification Method of Early Water Influx in Gas Wells of Reef-Flat Facies Gas Reservoir

作　　者：袁淋 陈曦[1] 姜林希 彭川容 何琳婧 Yuan Lin;Chen Xi;Jiang Linxi;Peng Chuanrong;He Linjing(No.2 Gas Production Plant,SINOPEC Southwest Oil&Gas Company,Langzhong Sichuan 637400)

机构地区：[1]中国石油化工股份有限公司西南油气分公司采气二厂,四川阆中637400

出　　处：《中外能源》2020年第7期36-43,共8页Sino-Global Energy

基　　金：国家重大专项“超深层高含硫气田水平井高产稳产工艺技术研究”(编号:2016ZX05017-005-003)。

摘　　要：元坝气田长兴组气藏为发育有底水与边水的礁滩性气藏,及时准确识别气藏早期水侵对气田开发具有重要的意义。以元坝礁滩型气藏为研究对象,分别利用基于物质平衡原理、不稳定试井原理以及生产动态特征等方法,对元坝气田产水气井早期水侵特征进行拟合,验证三类方法在早期水侵识别中的适用性,并结合其优缺点及适用范围,优选出适用于元坝气田的早期水侵识别方法。通过对比分析,结合元坝气田生产实际,宜采用生产动态特征法为主,其余两类方法作为辅助手段判别早期水侵识别。实例分析表明,生产动态资料中气样硫化氢含量、水样矿化度在水侵过程中较为敏感,成功识别已见水气井早期水侵现象及产水风险井早期水侵征兆,并制定延缓水体锥进的对策,验证了方法的可靠性。本文的研究内容可为元坝气田产水风险井早期水侵识别提供理论依据。The gas reservoirs of Changxing Formation in Yuanba Gas Field are reef-flat facies one with bottom water and edge water developed.To accurately identify early water influx of the gas reservoirs in time is important for the development of the gas fields.Yuanba reef-flat facies gas reservoirs are studied.The methods based on material balance equation,transient well test and production performance are applied to match the early water influx characteristics of water-producing gas wells in Yuanba Gas Field.The applicabil-ity of three methods for the early water influx identification is tested,and the optimized one for Yuanba Gas Field is selected combined with the advantages,disadvantages and their application scope.After correlation,analysis and actual production in Yuanba Gas Field,the method of production performance characteristics should be applied mainly and supported by other two methods.Case study shows the hydrogen sulfide content of the gas samples and salinity of water samples among the production performance data are sensitive during water influx,and it can identify the early water influx in the gas wells with water-breakthrough and sign of early water influx in high-risk water-producing wells.The countermeasures to slow down water coning in the gas wells is made.The reliability of the method is proved.The study in this paper can provide theoretical ba-sis for identifying early water influx of high-risk water-producing gas wells in Yuanba Gas Field.

关 键 词：元坝气田 礁滩相气藏 水侵识别 物质平衡 不稳定试井 生产动态 

分 类 号：TE37[石油与天然气工程—油气田开发工程]