水平井固井液压扶正器的研究与应用

Research and application of hydraulic centralizer for horizontal well cementing

徐鑫 魏新芳 王书峰

XU Xin WEI Xinfang WANG Shufeng

长江大学，湖北荆州　434000 胜利油田钻井工艺研究院，山东东营　257017 胜利油田河口采油厂，山东东营　257200

Yangtze University, Jingzhou 434000, China Drilling Technology Research Institute of Shengli Oilfield, Dongying257017, China Hekou Production Plant of Shengli Oilfield Co., Dongying 257200, China

水平井固井时套管往往偏向下井壁，居中度差，固井后形成的水泥环薄厚不均，导致水平井固井质量差，严重制约了水平井优势的发挥。现场多使用扶正器来提高套管居中度，但是常规扶正器存在外径大、下入困难、破坏井壁的问题，为此专门研制开发了水平井固井液压扶正器。该工具原始外径小、下入安全，膨胀后外径大、扶正能力强，能够显著提高水平井套管的居中度，扶正器上的扶正片能够对固井水泥浆产生扰流作用，大大提高了水平井的固井质量。该类扶正器现场应用简便，不影响正常的施工程序，在胜利油田进行了多口井的现场应用，效果显著。

Casing tends to be put near the lower wellbore when cementing horizontal wells, in other words, the centralized degree is poor, so the cement thickness is unequal around the casing, resulting in poor cementing quality, and it restricts the advantages of horizontal wells severely. Centralizer is usually used to improve the casing centralized degree in the field, but conventional centralizers has some problems, such as large diameter, difficulties in tripping into the hole, and breaking wellbore. So the hydraulic centralizer for horizontal well cementing was developed. It has some advantages, such as small original diameter, safety in tripping into the hole and large diameter after expansion. It can improve the centralized degree significantly and make burbling effect in cementing. The quality of cementing is improved greatly with the hydraulic centralizer. The application of centralizer in fields is simple, and does not affect cementing process. The tool has been used in many wells in Shengli Oilfield with significant effect.