煤层气保温保压保形取心工具研制及现场应用  

Development and Field Application of a Coalbed Methane Coring Tool with Pressure Maintenance,Thermal Insulation,and Shape Preservation Capabilities

作　　者：王西贵 邹德永[1] 杨立文 高玮 孙少亮 苏洋 WANG Xigui;ZOU Deyong;YANG Liwen;GAO Wei;SUN Shaoliang;SU Yang(School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong,266580,China;Engineering Technology Research Institute,CNPC Greatwall Drilling Company,Panjin,Liaoning,124010,China)

机构地区：[1]中国石油大学(华东)石油工程学院,山东青岛266580 [2]中国石油集团长城钻探工程有限公司工程技术研究院,辽宁盘锦124010

出　　处：《石油钻探技术》2021年第3期94-99,共6页Petroleum Drilling Techniques

基　　金：中国石油集团长城钻探工程有限公司科研项目“保压密闭取心工具现场应用”(编号:GWDC201801-06)部分研究内容。

摘　　要：煤层气岩心从井下取到地面的过程中游离气逃逸、吸附气部分解吸和孔渗测试数据失真,严重影响了煤层气开发方案制订,为此研制了煤层气保温保压保形取心工具。设计了圆弧闭合球阀,采用全密封式球体仓,可耐受60 MPa压力,解决了保压密封失效的问题;设计了复合式保温取心内筒,采用橡胶筒存储煤心,以二氧化硅气凝胶为保温层,使取心工具具有围压加持和煤心保温的功能;优选了表镶、孕镶复合式金刚石取心钻头,提高了取心钻头进尺。G-X20井应用煤层气保温保压保形取心工具保压取心3筒次,累计进尺9.60 m,岩心收获率94.48%,保压成功率均大于80%。研究结果表明,煤层气保温保压保形取心工具的保压、保气效果良好,现场施工工艺完善,可为煤层气、页岩气等非常规油气资源的精细勘探开发提供技术支撑。In the process of lifting the coalbed methane(CBM)cores from the subsurface to ground,free gas escapes,adsorbed gas is partially desorbed and pore-permeability test data is distorted,seriously hampering the establishment of the CBM development plan.Therefore,a CBM coring tool with pressure maintenance,thermal insulation and shape preservation capabilities was developed.By designing an arc closed ball-valve,the failure in the pressure-maintenance seal was overcome by using a fully sealed ball-valve chamber that can withstand a pressure of 60 MPa.Using rubber tubes to hold cores and silica aeroge for thermal insulation,a composite coring inner barrel with thermal insulation function was designed,which allowed the coring tool to achieve the advantages of both pressure confinement and thermal insulation.The surface-set and impregnated composite diamond coring bit was optimized,thereby improving the coring bit footage.The CBM coring tool was applied to Well G-X20 for three times,obtaining a cumulative footage of 9.60 m,with a coring recovery rate of 94.48%,and a pressure maintenance rate up to 80%.The results showed that the proposed coring tool for CBM was very effective in pressure maintenance and gas preservation.Combined with sophisticated field construction technology,the coring tool can provide technical support for fine exploration and development of unconventional oil and gas resources such as coalbed methane and shale gas.

关 键 词：煤层气 取心技术 保温保压 岩心收获率 现场应用 

分 类 号：TE921.3[石油与天然气工程—石油机械设备]