安岳气田磨溪区块龙王庙组气藏产水类型识别  

Type identification of water produced from Longwangmiao Fm gas reservoirs in Moxi Block of Anyue Gasfield

作　　者：欧家强[1] 王小蓉[1] 袁权[1] 阮基富[1] 唐仕谷 李忻洪[1] 

机构地区：[1]西南油气田公司川中油气矿研究所,四川遂宁629000

出　　处：《天然气勘探与开发》2017年第1期58-62,共5页Natural Gas Exploration and Development

摘　　要：四川盆地川中地区安岳气田磨溪区块下寒武统龙王庙组气藏为中高渗、特大型海相碳酸盐岩整装气藏。气井生产过程中产水类型多样、产水量差异较大,部分气井受水影响大,导致气井产气量、压力快速下降,不能持续稳定生产。为此,采用地层水识别的凝析水含量法、水化学特征法以及生产动态识别法,建立地层水综合判别标准对气井产水类型进行判别。研究结果表明:①龙王庙组气藏地层水矿化度大于100 g/L;Cl^-含量大于60 g/l,Br^-、Ba^(2+)+Sr^(2+)等为地层水典型的特征离子;②目前气藏生产井水气比普遍介于0.2~10 m^3/10~4 m^3,远高于饱和凝析水水气比0.1m^3/10~4m^3,生产动态Gp/Gw关系曲线呈上翘的趋势;③依据标准识别出气藏气井产水类型有入井液、凝析水和地层水,其中11口气井产地层水,10口气井具有较大的产地层水风险,23口气井以产凝析水为主。气藏气井产水类型的准确识别为及时调整产水井生产组织方案以及气藏治水对策提供技术支撑。The Lower Cambrian Longwangmiao Fm gas reservoirs in the Moxi Block of Anyue Gasfield, the Central Sichuan Basin, are supergiant monoblock marine carbonate gas reservoirs with medium-high permeability. Multiple types of water are produced and the water production rate is different in different gas wells. Some gas wells are greatly affected by formation water, and their gas pro- duction rate and pressure drop rapidly, hampering the continuous and stable gas production. In this paper, a comprehensive formation water criterion was established based on condensate water content method, hydrochemical characteristic method and production per- formance identification method, to identify the types of formation water produced in the gas wells. It is indicated that total salinity of formation water in Longwangmiao Fm gas reservoirs is higher than 100 g/l, and its C1 content is higher than 60 g/1. Br- and Ba2＋＋Sr2. are typical characteristic ions of formation water. At present, the water/gas ratio of Longwangmiao Fm gas reservoirs is generally in the range of 0.2-10 m3/10^4 m3, which is much higher than the water/gas ratio of condensate water （0.1 m3/10^4 m3）. The production performance Gp/Gw curve presents the upwarping trend. According to the criteria, the identified water produced from the gas reservoirs is injected fluids, condensate water and formation water. Specifically, 11 gas producers produce formation water, 10 gas producers have relatively high risk of producing formation water, and 23 gas producers mainly produce condensate water. The precise type identification of produced water can provide the technical support for adjusting the production organization scheme of water producing wells and the water control measures of gas reservoirs in time.

关 键 词：四川盆地 川中地区 磨溪区块 龙王庙组气藏 凝析水含量 水化学特征 地层水 

分 类 号：TE37[石油与天然气工程—油气田开发工程]