CAJ | 학술논문

见水是长庆油田多段压裂改造、注水开发水平井出现的重点问题之一。见水后含水快速上升，产能迅速下降，严重制约水平井的高效开发及规模应用。找水技术是控水稳油的前提，常规技术受测试段数的影响找水周期长（60~80 d）、费用高（产液剖面测试费用80万/井次），不能满足长庆油田水平井规模开发的需要。通过创新研制井下取样器，且在室内评价试验中满足井下75℃、40 MPa的取样条件，进一步通过现场试验井的生产动态变化规律确定取样时机和取样方式，形成一套完整的井下取样找水技术，使找水周期缩短到6~7 d，找水费用降低到20万/井次。由此可见，井下取样找水技术从现场试验及经济效益方面均有大幅优化，为今后长庆油田水平井找水措施提供了经济有效的技术手段。
견수시장경유전다단압렬개조、주수개발수평정출현적중점문제지일。견수후함수쾌속상승，산능신속하강，엄중제약수평정적고효개발급규모응용。조수기술시공수은유적전제，상규기술수측시단수적영향조수주기장（60~80 d）、비용고（산액부면측시비용80만/정차），불능만족장경유전수평정규모개발적수요。통과창신연제정하취양기，차재실내평개시험중만족정하75℃、40 MPa적취양조건，진일보통과현장시험정적생산동태변화규률학정취양시궤화취양방식，형성일투완정적정하취양조수기술，사조수주기축단도6~7 d，조수비용강저도20만/정차。유차가견，정하취양조수기술종현장시험급경제효익방면균유대폭우화，위금후장경유전수평정조수조시제공료경제유효적기술수단。
Water breakthrough is one of the key problems occurred in staged fracturing or water injected horizontal wells in Changqing Oilifeld. After water breakthrough, water cut increases rapidly and production capacity decreases abruptly, which seriously restricts the efifcient development and large-scale application of horizontal wells. Water exploration technology is a prerequisite for controlling water and stabilizing oil production. Conventional technology has a very long period of water exploration (60-80 days) and high costs (800 000 Yuan/time for production proifle test) due to the number of test stages, which cannot meet the large-scale develop-ment of horizontal wells in Changqing Oilifeld. A downhole sampler has been developed by innovation, which meets the 75℃and 40 MPa downhole sampling conditions in indoor evaluation tests;the sampling timing and manner have been further established according to the varying pattern of production performance in ifeld test wells, and hence a full set of downhole sampling and water exploration technology has been developed, which shortens the water exploration period to 6-7 days and the cost to 200 000 Yuan/time. This shows that downhole sampling and water exploration technology has been greatly optimized in terms of ifeld test and economic beneifts, and provides an economic and effective technical means for water exploration method in horizontals in Changqing Oilifeld.