高温含硫凝析气藏取样技术探讨  

Discussion on sampling technology of high-temperature sulfur-bearing condensate gas reservoir

作　　者：许峰 赵洪涛 XU Feng;ZHAO Hongtao(China-France Bohai Geoservices Co.,Ltd. Tianjin 300452,China)

机构地区：[1]中法渤海地质服务有限公司

出　　处：《油气井测试》2019年第4期20-26,共7页Well Testing

摘　　要：渤海某探井具有高温、含H2S、有凝析油产出等特点,井下PVT取样难度较大。为保证成功获取井下流体样品,梳理了目前渤海地区常用的RD取样阀、RD单相取样器、P.D.S(Positive Displacement Sampler)正置换式取样器、S.P.S(Single Phase Sample)单相取样器,以及地面触控式取样器等取样技术,分析了各种取样技术的优势和不足,结合该测试井特征,优选出Proserv公司生产的S.P.S单相取样器进行该井高压物性取样。作业过程中,将取样器安装在取样器托筒上随钻杆下入,在开井流动阶段操作环空压力击穿破裂盘触发取样,获取储层流体样品。经实验室分析,样品闪蒸气油比1413m^3/m^3,油罐油密度0.8024g/cm^3,单次闪蒸气组分H2S含量5.73ppm。对闪蒸油、闪蒸气做组份分析,计算井流物分类组成C1+N2为71.62%、C2-C6+CO2为21.09%、C7+为7.29%认为,样品属凝析气藏范围,与前期认识一致,取样达到了预期效果。S.P.S单相取样器能够适用于含H2S、CO2的酸性、具腐蚀性油(气)田,具有保压、抗腐蚀特性,可在类似油气田中推广使用。Downhole PVT sampling is difficult to be conducted in a certain exploration well of Bohai Sea Oilfield because of the characteristics of high temperature,containing H 2S and condensate oil.To ensure the successful acquisition of downhole fluid samples,the advantages and disadvantages of RD sampling valve,RD single-phase sampler,P.D.S(Positive Displacement Sampler),S.P.S(Single Phase Sample)and ground touch sampler were analyzed in this paper.In view of the characteristics of the test well,the S.P.S single-phase sampler produced by Proserv Company was selected to sample the high-pressure physical properties of the well.During the operation,the sampler was installed on the sampler bracket and run in hole with the drill pipe.During the flowing stage of well opening,the rupture disk was broken through by the annulus pressure so as to trigger sampling and obtain reservoir fluid sample.Laboratory analysis showed that the flash GOR of the sample was 1 413 m^3/m^3,the oil density in the tank was 0.8024g/cm^3,and the H 2S content of the single flash gas component was 5.73 ppm.Based on the component analysis of flash oil and flash gas,the calculated components of the well flow classification were as follows:C1+N2 was 71.62%,C2~C6+CO2 was 21.09%,and C7+was 7.29%.Therefore,the sample was considered to be the condensate gas reservoirs.S.P.S can be applied to acidic and corrosive oil(gas)fields containing H2S and CO2.It can hold the reservoirpressure and has a better anti-corrosion ability,thus it can be widely used in similar oil and gas fields.

关 键 词：单相取样器 含硫 高温 凝析气藏 PVT取样 组分分析 

分 类 号：TE377[石油与天然气工程—油气田开发工程]