油气藏评价与开发
油氣藏評價與開髮
유기장평개여개발
2012年
6期
77-80
,共4页
煤层气井%捞砂%定向井%漏失%双固定凡尔
煤層氣井%撈砂%定嚮井%漏失%雙固定凡爾
매층기정%로사%정향정%루실%쌍고정범이
CBM wells%sand bailing%directional wells%leakage%double fixed valve
冲砂存在漏失、污染煤层的问题，煤层气井井筒清砂作业，主要依靠捞砂工艺。但捞砂在定向井的施工比直井的成功率要低。分析捞砂工艺的特点和难点，找出在煤层气斜井捞砂施工中捞砂有进尺却无效果的原因，是上提管柱过程中，捞砂铲的固定凡尔关闭不严，造成砂子漏失。通过使用双固定凡尔，有效地解决砂子的漏失问题，并在后期的生产中取得了很好的效果，提高了定向井捞砂施工的效率。
遲砂存在漏失、汙染煤層的問題，煤層氣井井筒清砂作業，主要依靠撈砂工藝。但撈砂在定嚮井的施工比直井的成功率要低。分析撈砂工藝的特點和難點，找齣在煤層氣斜井撈砂施工中撈砂有進呎卻無效果的原因，是上提管柱過程中，撈砂鏟的固定凡爾關閉不嚴，造成砂子漏失。通過使用雙固定凡爾，有效地解決砂子的漏失問題，併在後期的生產中取得瞭很好的效果，提高瞭定嚮井撈砂施工的效率。
충사존재루실、오염매층적문제，매층기정정통청사작업，주요의고로사공예。단로사재정향정적시공비직정적성공솔요저。분석로사공예적특점화난점，조출재매층기사정로사시공중로사유진척각무효과적원인，시상제관주과정중，로사산적고정범이관폐불엄，조성사자루실。통과사용쌍고정범이，유효지해결사자적루실문제，병재후기적생산중취득료흔호적효과，제고료정향정로사시공적효솔。
Since sand washing can easily arouse the problems of sand leakage and coal beds contamination, the most reliable meth-od for sand removal in CBM wells is sand bailing technique. Compared to sand bailing operation in vertical wells, those in direction-al wells face more challenges. Based on the summarization and analysis of the characteristics and difficulties of sand bailing tech-nique, this paper found out the reason that the noncommercial footage of sand bailing in the inclined CBM wells was due to tight-ness failure of the fixed valve in the bailer conductor contributed to the leakage of sand during the process of the column raising. The application of double fixed valve can well solve the problems of sand leakage,obtained good effects during the later production period and highly increased sand bailing operation efficiency in directional wells.
