在前期研发累积式气体流量计的基础上,集成研制出一套煤层气井生产测试组合仪,以解决气水两相流分层测试的难题,并进行了现场实际应用。生产测试组合仪采用累积式气体流量计测试分层产气量,累积式气体流量计在井下可灵活转换为电容式持水率计测量持水率,结合伽马示踪流量计测得的流体流速,可求得分层产水量,满足了在煤层气井中气水同测和仪器集成小型化的要求。采用动密封压力平衡技术解决了累积式气体流量计在井下活塞开启时承压筒内外受力不平衡的问题;采用可释放导锥取代鼠笼式导锥,有效解决测试仪器入井困难的问题。测试仪器直径22 mm,可通过偏心井口下入到油套环空进行测试。现场测试时将仪器停靠不同煤层并采用递减法求得分层产气及产水量,以此对合层排采井进行产气、产水分层评价。现场应用效果显示仪器具有小型化、测试精度高、测量时间短、不影响生产等优点,具有广阔的推广应用前景。图6表3参18
On the basis of the previous development of cumulative gas flow meter, a set of integrated coalbed methane (CBM) well production test instrument is developed and applied in field to solve the problem of gas-water phase flow production stratified logging test. This instrument uses a cumulative gas flow meter to test stratified gas production, which can be flexibly converted into a capacitive water holdup meter underground to obtain water holdup. Fluid flow rate can be measured by the converted capacitive water holdup meter combined with a gamma tracer flow meter, and hence stratified water production can be calculated. The instrument meets the gas and water production synchronous measurement and integrated miniaturization. A dynamic seal pressure balancing technology is applied to solve the unbalance between internal and external forces of pressure cylinder when down-hole piston is open in the well. The use of novel releasable guide cone to replace the squirrel cage guide cone effectively solved the difficult problem of the instrument entering the CBM well. With a diameter of only 22 mm, the instrument can be run in to the annulus through an eccentric wellhead. In field test the gas and water production of different layers can be obtained using declining method by placing the instrument at different coal seams, to evaluate gas and water production of different layers in commingle production CBM wells. Field application shows that the instrument has the advantages of small size, high measuring precision, short measuring time, and no disruption on well production, etc., and exhibits a broad application prospect in CBM development.
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