罗静 王贺宁 华志远 彭纪龙

摘 要：垦利16-1油田位于渤海南部海域，隶属垦利油田群开发体系，储层地质条件复杂，具有典型“边、小、碎、深”的特点，不仅是“十四五”技术攻关的主要方向，更是新时期油田开发的典型代表。本文通过对该区块水泥浆体系，安全高效的下套管技术，附件的优化与应用，现场施工技术等方面的研究，提出了一套系统、成熟的大位移井固井技术。该技术在现场实践中取得了显著效果，保障了该区块大位移井的固井质量，对渤海湾海域大位移井固井质量的提高提供了新的理论依据，具有深远的现实意义。

关键词：浅层大位移井;水泥浆体系;固井

中图分类号：TE151     文献标识码：A       文章编号：1003-5168（2021）30-0068-04

Abstract： The KL16-1 oil field is located in the southern waters of the Bohai Sea and belongs to the development system of the Kenli oil field. The reservoir geological conditions are complex and with typical characteristics of "edge， small， broken and deep". It is not only the main direction of the "14th Five-Year Plan" technical research， but also a typical representative of oilfield development in the new period. This paper puts forward a set of systematic and mature cementing technology for extended reach wells through research on the block's cement slurry system， safe and efficient casing running technology， optimization and application of accessories， on-site construction technology and so on. This technology has achieved remarkable results in field practice， ensuring the cementing quality of extended reach wells in this block， and provided a new theoretical basis and far-reaching practical significance for improving the cementing quality of extended reach wells in the Bohai Bay area.

Keywords： shallow extended reach well; slurry system; well cementation

1 淺层大位移井作业难点

1.1 套管下入困难

浅层大位移井套管下入过程中，套管柱在经过大井斜段时部分套管柱紧贴下井壁，由于套管刚性较大，使得在狗腿度大的地方难以下入[1]。进入水平段后，水平段的套管柱完全紧贴在下井壁，增大了地层对套管柱的摩擦阻力，使套管下入更加困难。垦利16-1油田大位移井最大水垂比达到3.17，下套管难度及风险都极大。

1.2 顶替效率差

浅层大位移井井斜大，部分套管柱紧贴井壁，套管严重不居中，影响顶替效率。垦利16-1油田大位移井漏失风险较高，受限于施工安全条件下的注替排量，冲洗液冲洗效率不高。

1.3 漏失风险

垦利16-1油田大位移井普遍存在浅部断层，且固井过程中岩屑易在井壁低边不断沉积，造成环空间隙小甚至于环空桥堵，固井施工中压耗高，ECD通常较大，存在漏失风险。……