煤层气井气水两相流分层测试技术

发布时间：2018-03-08 10:33

本文选题：煤层气井　切入点：气水两相流　出处：《石油勘探与开发》2017年02期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Based on the previous research and development of accumulative gas Flowmeter, a set of coalbed gas well production test combination instrument was developed to solve the difficult problem of gas-water two-phase flow stratification test. The cumulative gas Flowmeter is used to measure the stratified gas production, and the accumulative gas Flowmeter can be converted flexibly into capacitive water holdup meter to measure the water holdup. Combined with the flow velocity measured by the gamma tracer Flowmeter, the stratified water production can be obtained. It meets the requirement of gas and water measurement in coalbed gas wells and the miniaturization of instruments. The dynamic sealing pressure balance technique is used to solve the problem of the internal and external force imbalance of accumulative gas Flowmeter when the piston is opened. The release guide cone is used instead of the squirrel-cage guide cone. The test instrument is 22 mm in diameter and can be tested through the annulus of oil under the eccentric wellhead. In the field test, the instrument docks to different coal seams and uses the decreasing method to obtain the stratified gas production and water production. The field application effect shows that the instrument has the advantages of miniaturization, high measuring precision, short measuring time and no influence on production, so it has a broad prospect of popularization and application.
【作者单位】：国土资源部油气资源战略研究中心;中联煤层气国家工程研究中心有限责任公司;中国石油集团测井有限公司华北事业部;
【基金】：国家科技重大专项“煤层气井生产测试技术研究”(2011ZX05038-003);国家科技重大专项“煤层气开发指标预测技术研究”(2016ZX05042002-003)
【分类号】：TE37

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