涪陵页岩气田水平井井身结构优化设计

发布时间：2018-12-12 15:30

【摘要】：涪陵页岩气田前期水平井因导眼和一开井眼尺寸大,导致机械钻速低,并存在一开井塌严重、二开井壁易失稳等问题。为此,在分析涪陵地区钻井工程地质环境特点的基础上,确定了套管必封点,并根据William钻速方程缩小了导眼和一开井眼的尺寸,将表层套管下深从长兴组上提至飞仙关组顶部,二开中完井深由进入浊积砂体3.00~5.00m,调整为进入龙马溪组地层50.00~100.00m后下入技术套管,从而形成了优化后的井身结构。涪陵页岩气田水平井自2014年后期开始采用优化后的井身结构,2015年105口水平井与2013年采用原井身结构的30口水平井相比,平均机械钻速提高了65.74%,在井深增大的情况下,平均钻完井周期缩短了20.95%。这表明,优化井身结构后达到了提高机械钻速、减少井下故障、缩短钻井周期的目的。
[Abstract]:In the early stage of Fuling shale gas field due to the large size of the leading hole and the first opening hole the mechanical drilling speed is low and there are some problems such as the serious collapse of the opening well and the instability of the second opening shaft wall. Therefore, on the basis of analyzing the characteristics of drilling engineering geological environment in Fuling area, the casing sealing point is determined, and according to the William drilling speed equation, the size of the leading hole and the first opening hole is reduced, and the surface casing depth is lifted from Changxing formation to the top of the Feixianguan formation. The second opening middle completion depth was changed from 3. 00 to 5. 00m into turbidite sand body and adjusted to 5. 00m and 10. 00m into the formation of Longmaxi formation, then into the technical casing, thus forming the optimized wellbore structure. The horizontal wells in Fuling Shale and Gas Field have adopted the optimized wellbore structure since late 2014. Compared with 30 horizontal wells with original shaft structure in 2013, 105 horizontal wells in 2015 increased the average drilling speed by 65.74. With the increase of well depth, The average drilling and completion cycle was reduced by 20.95. This indicates that the purpose of improving drilling speed, reducing downhole faults and shortening drilling cycle can be achieved by optimizing well structure.
【作者单位】：中石化中原石油工程有限公司钻井一公司;中石化重庆涪陵页岩气勘探开发有限公司;
【分类号】：TE243

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